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CROSS-REFERENCE TO RELATED APPLICATION 
   Not Applicable 
   STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
   Not Applicable 
   REFERENCE TO A MICROFICHE APPENDIX 
   Not Applicable 
   The present invention relates to apparatuses and methods for constructing an underground curvilinear and narrow horizontally extending structure, an electrical and light-conducting cable and ground water-draining and material-supplying pipeline, and an anchor, foundation, and ground gas and liquid-captating wall in an excavation, a slit and slot trench being formed in the ground. 
   In constructing the curved underground structures according to a prior art technique, firstly a section of an excavation, a horizontal slit and slot trench is dug in the ground in an intended direction along an intended excavation line up to a predetermined depth and distance by a proper underground-movable excavating means operated to excavate the ground and adapted to make the curvilinear excavation section, and secondly the excavated section is evacuated with movement of the constructing means forward in the horizontal direction, and thirdly a proper material, a length of the cable, drain and supplying pipe, plastic sheet, filter sand, sealing compound is placed into the section. 
   A well-known apparatus for constructing an underground curvilinear and narrow horizontally extending structure in-place of a trench comprises an elongate constructing means provided generally with an excavation-making means operated to excavate the ground and advance the curvilinear excavation section along the curved excavation line, and an excavation section side walls-supporting means. 
   There is known a steering means for an apparatus disclosed in U.S. Pat. No. 5,934,833, the steering means mounted securely to a frame member of the chassis for steering the apparatus with the chassis rolling across the ground to allow excavating the curvilinear trench section by turning break the frame member of the chassis about a central vertical hinge disposed between to turn relatively front driving wheels and a rear driven wheel, that is difficult because the steering is carried out while the apparatus advances and the advancing and driving front wheels of the chassis must provide large road-holding capacity. The cantilever constructing means being inserted into the ground and rotated in the ground by forcing with a transporting and travelling chassis along the length of the line so there are significant defects including requirements of large road-engaging and holding and stabilizing mass of the chassis to provide a huge propulsive force and rotary traction for rotary inserting into and moving the constructing means in the ground and create a huge stabilizing moment about a horizontal and transverse axis for the cantilever constructing means, and the difficulties of advancement of the constructing means into the solid ground, especially including boulders, and the necessary very large chassis means through the loose and slippery ground and rough country. 
   To decrease those huge intended traction and stabilizing moment for the constructing means which must be created by the chassis it is well-known a slit trench digging apparatus disclosed in U.S. Pat. No. 3,638,339 and provided with a disposed vertically slit trenching blade being capable of oscillating about a vertical axis to form a slit trench and expanding reciprocatingly aside to compact the ground of the side walls and widen the trench, so though there are common defects necessiated with forced applying a huge torque to the blade and its cheeks from above the ground level, and large friction resistance by the compacted side walls to the advancement of the blade; as well as utilizing an advanceable and the side walls-supporting shield disclosed in U.S. Pat. No. 3,994,139 and adapted for laying the pipeline into an open trench, where the shield being composed of a set of the longitudinally displaceable elongate cutting and side wall-supporting planks, a frame member for supporting and guiding the planks and ram means for effecting relative movement between the frame member and planks to effect advancement of the trench. In operation, the ram means advance the planks in relation to the frame member so as to excavate a trench, and other ram means for he planks not being advanced are blocked and holding the remainder of the shield, including the frame member, stationary until all of the planks have been advanced, and then the ram means shift the frame member in the advancing direction. Significant defects of those shield and a method of its advancement are, firstly, that the planks and trench, on the one hand, and the frame member and the pipeline, on the other hand, are advanced alternately and interruptible at a lesser mean speed because frequent standing idles; secondly, advancement of the frame member is not secured because stoppages of the advanced planks and firm frictional contact of the planks with the bottom and walls of the trench are not secured, especially in an unstable, clayey, and muddy, and quick, and running watered, and also in a stony ground, and thirdly, the shield is not capable of advancing a curvilinear trench section. 
   There is also disclosed in U.S. Pat. No. 5,244,315 a barrier wall installation system comprising a chassis means and a slot trench-excavating assembly digging a vertical slot trench of a depth up to sixty feet behind the chassis means. Significant defects of that barrier wall installation system are: firstly, the huge traction force and stabilizing moment must be applied by the chassis; and secondly, the chassis and the slot trencher are not capable of going round an obstacle like a boulder comes suddenly across the trencher in the ground. 
   There is known to use an excavator disclosed in U.S. Pat. No. 5,685,668 for constructing an underground continuous wall, comprising an extensible and guide post vertically supported by a tiltable frame on a traveling trolley of a chassis and having an endless chain cutter member and agitator. Significant defects of those excavator and method of its advancement are, firstly, the hole drilled in an unstable ground will be quickly collapsed that prevents the excavator to be inserted into the hole; secondly, the cantilever chain cutter member is advanced by a necessary huge traction force while the huge stabilizing moment must be applied by the trolley from above the ground level; thirdly, the excavator is not capable of going round an obstacle like a boulder comes suddenly across the trencher in the ground. 
   SUMMARY OF THE INVENTION 
   It is an object of the invention to provide more efficient apparatuses and simple methods for constructing the continuous narrow underground structures such as a curvilinear cable, drain and supplying pipe line, anchor and foundation column and pile, and a curved area-shaped anchor, foundation, drain and impervious stratum and wall in-place of a smooth excavation such as a hole and trench being formed in the unstable ground that includes boulders and rocks and having the side walls being supported by the movable longitudinally and turningly wall-supporting means of constructing means of the apparatuses, for lighten and reliable securing the continuous and steering turning advancement of the excavation, the continuous structure and the non-self-propelled and steered apparatus across a land being difficult to pass through, and around the boulders and rocks discovered ahead of the constructing means, owing a better manoeuvrability of the constructing means and a continuous, directing and increased traction force being applied to the chassis by the constructing means, and exception of stops and idle standing of the constructing means advancing turningly the excavated section and structure and any risk of damage of the structure because the stoppages. 
   In order to accomplish the object of the invention, the apparatus for constructing an underground curvilinear and narrow structure in an excavation being formed in the ground that includes large and mainly ball-shaped boulders, the apparatus according to the invention comprises: a chassis means supporting a means for constructing the structure and supplying motive power and structure materials to a structure constructing means of the apparatus, the chassis is capable of moving along the length of and stopping at a structure line, the constructing means comprising a frame member for supporting components of the constructing means and a means for making excavated sections to excavate sections ahead of the supporting frame means, the making means is able to force the supporting frame member from its position toward the intended advancing direction and control the direction of the advancement of the excavation, and is adapted to be disposed in working positions and extended into the ground up to a predetermined depth and distance toward and in the intended advancing direction to excavate, and form the side walls of an excavated section being formed along the length of the line to lay the structure materials into the excavated section; and a connecting framework means mounted on the chassis means and adapted to connect the constructing means to the chassis means and to dispose and advance the constructing means in an intended advancing direction, the framework means comprises a carrier member that is forced into engagement with the supporting frame member; where the excavation-making means has the ability to control the direction of the excavated section and comprises excavation-making portions having the ability to control the force and direction of deformation of the working end facial wall of the excavated section at the making means, where the making means is capable of being forced into interaction with the facial wall of the excavated section being formed to urge the constructing means with the frame member in a direction crossing the central longitudinal axis of the excavated section toward the intended advancing direction and has forward-oriented excavation-making portions for forcing the wall in the crossing direction, where the portions are operable to move the constructing means, with the directing and making means, relative to the wall being forced toward the direction by an activating means capable of forcing the portions against the wall, the portions have the ability to control the direction and force of deformation of the facial wall of the excavated section being formed; where the making members and the follower frame member are connected for movement about axes preferably perpendicular to the central longitudinal surfaces of the members and transversal to the direction of advancement of the members with the ability to interact with the walls to urge the members in the lateral direction in formation of the excavated section, where the making portions of the making members are capable of forcing continuously the facial wall in a direction opposite to the diverged advancing direction and operable to move the constructing means toward and in the direction by a drive means that located within the excavated section and capable to move the portions about the axes relative to the frame member, and the portions of the frame member are capable of deforming the ground to form the side walls into a curved surfaces and are operated by the activating means to move the members about the axes in order to move the members along the length of the section; where the making members have forward oriented, angle-shaping portions, the member comprises a drive means located within the excavated section to effect the relative movement about the axes between the directing and making member and the follower frame member; the making members comprise a directing and making wedge-shaped cutter member connected to the frame member for movement about an axis on the central longitudinal surfaces of and transversal to the direction of advancement of the cutter member and the frame member; the making members have the ability to be forced to move about the axis of the frame member and are adapted to urge the frame member to move about the axis of the carrier member, and the portions being capable to be forced to move about the axis of the frame member and operable to move the frame member toward the intended advancing direction by a drive means capable of moving the portions about the axis relative to the frame member; the drive means comprises a means for providing motive power having a longitudinally in the axial direction displaceable output rod and including castellated portions leaning on corresponding castellated bearings of the support frame member for axial longitudinal displacement and engaging screw-shaped splined portions capable of interacting with corresponding engaged screw-shaped splined portions of the making members; the portions are composed of a plurality of cutting and directing sections with the ability to be moved separately and being operable to move about the axis by the separate drive means capable to move each of the sections about the axis separately from the other sections and to fix the sections to be stationary relative to the frame member, the movement of the frame member about the axes is allowable by catch locks of the framework that are adapted to be broken by a buried obstacle of a predetermined size the apparatus comes across in the ground; where the directing and making means is disposed perpendicularly to the road surface and capable of forcing the wall in a direction crossing on the sides of the axis of turning advancement of the excavated section and adapted to urge the chassis means to move about the axis, the carrier member that is disposed remotely from the axis of turning advancement of the chassis means and adapted to urge the chassis means about the axis to follow the constructing means while the excavated section is being advanced so that the direction of the transportation of the chassis means can be controlled. 
   The apparatus further comprises a plurality of side wall-supporting members that are connected to the frame member for movement about the axis of turning advancement of the excavation and adapted to urge the frame member forward and about the axis relative to the walls to form cylindrically-shaped walls, and a plurality of activating rams means for effecting the relative turning movement between the frame member and the forming members about the axis to effect the turning advancement of the excavation; where the multiple activating means are capable of simultaneously effecting uninterruptible movements together between the frame member and the intended number of the forming members aside of the frame member and stationary relative to the walls at the speed V1, where the speed V1 is equal to the speed of continuous uniform advancement of the frame member in the same direction with the chassis means and alternate and uninterruptible movement in opposite directions between the frame member and each of the forming members alternately approaching the end of the working stroke at preferably the same speeds V2 and distances relative to the frame member, where the speed V2 must be equal to not less than about “(0.5n−1)×V1” in relation to the frame member and “0.5n×V1” in relation to the ground where “n” is the number of the forming members; where the side walls-engaging members have the ability to be expanded and outwardly forced into compressive engagement with the side walls being supported by the member to immobilise the side wall-supporting member relative to the walls; where the frame member is connected to the framework means for movement about a direct axis, and transversal axis, and an axis perpendicular to the road surface; the side wall-engaging members are multistorily disposed and the rams means are capable of moving the constructing means about the axes of the connection the constructing means and the carrier member into intended positions in the ground at speeds according to the locations of each of the members along the length of the frame member; where the directing and making means is disposed perpendicularly to the road surface and capable of forcing the wall in a direction crossing on the sides of the axis of turning advancement of the excavated section and adapted to urge the chassis means to move about the axis, where the carrier member is disposed remotely from the axis of turning advancement of the chassis means and adapted to urge the chassis means about the axis to follow the constructing means while the excavated section is being advanced so that the direction of the transportation of the chassis means can be controlled; and the supporting means is adapted to urge the chassis means forward relative to the side walls being supported and the rams means capable to advance the chassis means relative to the wall-forming and supporting members; and the carrier member is disposed remotely ahead of the axis of turning advancement of the chassis means and adapted to urge the chassis means forward and about the axis to follow the frame member while the excavated section is being advanced so that the chassis means can be steeringly advanced; the carrier member is operated by an activating means that is capable of moving wall-forming and supporting members backward relative to the frame member and by an activating drive means capable of rotating directing and making members relative to the frame member. 
   The apparatus further comprises the directing and making members and several follower members connected in consecutive order, relative to the advancing direction, for movement about axes preferably perpendicular to the central longitudinal axes of adjacent members with the ability to interact with the walls to urge the members in the lateral direction in the formation of the excavated section, and the portions are capable of deforming the ground to form the side walls with a curvilinear longitudinal axis and are operated by the activating means capable to move the members about the axes in order to move the members along the length of the section; where the front follower member and a next follower member are relatively movable along a direction crossing the central longitudinal surface of the next member toward the intended advancing direction and comprise another follower member, and holding member connected to the next member for radial movement about a front follower member axis on the central longitudinal surfaces of the front member and the next member and crossing the advancing direction and for holding the front member to be oriented in the radial direction about the axis; a second activating means of the constructing means effects the movement between the front member and the next member about the first follower member axis to form the side walls to advance the excavated section; where the directing and making member and the front follower member consist of a plurality of shortened unit means for controlling the direction of the excavation, compressing and forming and supporting the side walls, the unit means are disposed in narrow side-by-narrow side relationship in relation to a direction crossing the advancing direction and along the length of a forward-oriented edge of the next follower member, each of the unit means includes a direction-controlling and excavation-making member that is able to force the facial wall and oppose side wall-deforming and supporting members that are engaged with the walls and movable in a radial direction about the first follower member axis on the central longitudinal surface of the front member and the next member, where the front member is connected to a separate follower member holding member to allow reciprocating movement in the radial directions about the first follower member axis relative to the next member, the movement being caused by an activating means of the unit means, and is capable of moving the holding member about the first axis behind one of the unit means on the central longitudinal surfaces of the front member, the next member, and the holding member and crossing, preferably transversal to the direction of reciprocating movement between the next member and the front member with the ability to be rotated separately by the making member relative to the next member in a diverged in relation to other unit means radial direction to separately form and support the walls and effect movement between the next member and further adjacent follower member about a second follower member axis to effect the turning advancement of the excavated section in a diverged direction and past an obstacle; the holding member is adapted to locate a position of the unit means relative to the next member and is connected to each of the adjacent holding members between by a catch lock that is adapted to be broken by an obstacle of a predetermined size; each of the unit means comprises a drive means for effecting the movement between the making member and the front support member to effect the movement between the making member and the next member about the first follower member axis and the excavated section; where the directing and making members capable of forcing the facial wall in a direction crossing on the sides axes of movable connection of the frame member to the framework means and are adapted to urge the constructing means toward the one side as well as other side about the axes, and the portions being disposed remotely ahead of the axes, and the frame member is adapted to be moved about the axes; where the next member is the frame member connected to the carrier member for turning the chassis means about the centre, the connection is made remotely from and ahead of the centre, the carrier member is adapted to turn the chassis means to follow the adjacent frame member and operated by the activating means of the constructing means that is capable of moving the front member backward to the next member and by an activating means of the constructing means that is capable of moving the making members relative to the front support member, the activating means of the frame member capable of moving the unit means and the constructing means about a transversal axis of the connection the frame member and the carrier member and an axis of curvature of an initial excavated section being advanced into intended working positions for horizontal advancement in the ground at speeds according to the locations of each of the unit means along the length of the frame member and relative to the axis; where the next member is connected to the framework means for movement about a direct axis, the transversal axis, and a vertical axis; where the framework means is adapted to turn the chassis means to follow the adjacent next frame member. 
   In another aspect, in the underground continuous structure construction method using the apparatus described above, the method according to the invention comprises the following steps: (a) operating an activating means of an apparatus for constructing the excavation, the activating means moves a means for constructing the underground structure with a framework means on a movable chassis means of the apparatus into working positions on an excavation line; (b) operating the activating means to insert the means for directing and making at the working position into the ground to a predetermined depth and distance in the excavation and in an intended advancing direction, so that the means for directing and making forms the section of the excavation along the excavation line, the direction of the excavation diverges from the tangent of the central longitudinal axis of the section and is determined, (c) operating the activating means to insert into and move a supporting frame member of the constructing means in the excavated section along the tangent to cause the directing and making means to excavate the section; (d) operating an activating and drive means of the constructing means to move the directing and making means to force the ground of the facial end working wall of the excavated section at the directing and making means in a direction opposite to the diverged direction to cause to be forced toward the diverged direction and force the frame member to form the side walls at the frame member toward the diverged direction so to advance the excavation in the diverged direction to evacuate the section and materials of the structure to be let into the excavated and evacuated section; where the activating and drive means are located within the section that is formed by forces applied to the walls of the section by the directing and making means and the frame member; stopping the constructing means by the activating means of the apparatus right away when the constructing means accidentally runs against a buried obstacle, and remotely exploring a position, shape, and dimensions of the buried obstacle by a well-known suitable measuring means to determine when to operate the multiple activating means to effect further advancement of the section, and selectively operating the multiple activating means of the apparatus in accordance with results of the measuring means; operating an activating means of the constructing means to move toward and in the diverged direction a means for forming and supporting the side walls, the means for forming and supporting being part of the constructing means, relative to the frame member and turning the frame member relative to the supporting means toward and in the diverged direction; stopping the constructing means by the activating means of the apparatus right away when the constructing means accidentally runs against a buried obstacle, and remotely exploring a position, shape, and dimensions of the buried obstacle by a well-known suitable measuring means to determine when to operate the multiple activating means to effect further advancement of the section, and selectively operating the multiple activating means of the apparatus in accordance with results of the measuring means; (e) operating the activating means of the constructing means to advance a means for forming and supporting the side walls of the excavation about and relative to the axes of the frame member and to stop within the excavated section to form and support the walls, where the means for forming and supporting being part of the constructing means; (f) operating an activating means of the forming and supporting means to move wall-forming and supporting portions of the stopped forming and supporting means outwardly in opposite directions against the walls of the section to form the walls; and (g) operating the activating means of the constructing means to move the frame member about and relative to the axes of the forming and supporting means in the advancing turning direction at a speed, V1, where the speed must be equal to a speed of turning the constructing means in the same direction by the activating means of the chassis means to cause the constructing means to decrease the traction by and the overturning moment about the chassis means, the speed V1 of the continuous uniform turning the frame relative to the forming and supporting means is secured by operating the activating means of the constructing means to effect the alternate uninterruptible turning in the opposite directions between the frame and each of the side walls forming and supporting members, n, with the same preferably distances and speeds, V2, relative to the frame, and V3, relative to the ground, where the speeds must be equal to no less than about V2=(0.5n−1)×V1, and V3=0.5n×V1. 
   An apparatus for use in constructing an underground continuous horizontally extending narrow structure in an excavation being formed in the ground, the apparatus according to the invention and comprises: an advanceable means for excavating an excavation and supporting the walls thereof, the constructing means being composed of a plurality of longitudinally displaceable side wall-supporting members, frame means for supporting and guiding the members and activating ram means for effecting relative movement between the frame means and the members to effect advancement of the excavation, the wall-supporting members have the ability to be expanded and outwardly forced into compressive engagement with the side walls being supported by the member to immobilize the side wall-supporting member relative to the walls; where the side wall-supporting members have side wall-supporting portions reciprocatingly movable in transversal direction that are capable to compressively engage the walls of the excavated section and are operable to expand the supporting member for immobilizing the member relative to the walls by an activating means capable to outwardly move the portions to engage the walls and move the portions relative to the frame means and the adjacent supporting member; where the multiple activating means are capable of simultaneously effecting uninterruptible movements together between the frame means and the intended number of the members stationary relative to the walls at the speed V1, where the speed V1 is equal to the speed of continuous uniform advancement of the frame means in the same direction with another traction means of the apparatus and alternate and uninteruptible movement in opposite directions between the frame means and each of the members alternately approaching the end of the working stroke of the ram means at preferably the same speeds V2 and distances relative to the frame means where the speed V2 must be equal to not less than about “(0.5n−1)×V1” in relation to the frame means and “0.5n×V1” in relation to the ground where “n” is the number of the members. 
   A method for use in constructing an underground continuous horizontally extending narrow structure in an excavation being formed in the ground, the method according to the invention and comprising: (a) operating the activating means of the constructing means to advance a means for supporting the side walls of the excavation relative to the frame means which supports and guides the members and to stop within the formed section to support the walls, where the means for supporting being part of the constructing means; (b) operating an activating means of the supporting means to move wall-supporting portions of the stopped supporting means outwardly in opposite directions against and into compressive engagement with the walls of the section to immobilise the supporting means relative to the walls; and (c) operating the activating means of the constructing means to move the frame means relative to the supporting means in the advancing direction at a speed, V1, where the speed must be equal to a speed of movement of the constructing means in the same direction with an another traction means to cause the constructing means to decrease the traction by and the overturning moment about the traction means; where the speed V1 of the continuous uniform movement of the frame means relative to the supporting means is secured by operating the activating means of the constructing means to effect the alternate longitudinal uninterruptible movement in the opposite directions between the frame means and each of “n” side wall supporting members of the supporting means with the same preferably distances and speeds, V2, relative to the frame means, where the speeds must be equal to no less than about V2=(0.5n−1)×V1. 

   
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
     In the drawings,  FIG. 1  is a side-view, partly in schematic form of a first preferable embodiment of an apparatus for constructing an underground structure, the apparatus is adapted to construct a horizontal drain pipeline and granular filter in a slit trench of the depth of four meters and the width of 30 centimetres being formed in unstable ground that includes large and mainly ball-shaped boulders, according to the present invention; 
       FIG. 2  is a plan view of the apparatus in  FIG. 1 ; 
       FIG. 3  is a front view of the apparatus in  FIG. 1  and  FIG. 2 ; 
       FIG. 4  is a side view and partly axial longitudinal vertical cross-sectional view of the excavation-directing and side walls-forming unit means  3  in  FIG. 1  to  FIG. 3 ; 
       FIG. 5  is a plan view and partly cross-sectional view A-A of the unit means  3  in  FIG. 4 ; 
       FIG. 6  is a front view and partly cross-sectional view B-B of the unit means  3  in  FIG. 4  and  FIG. 5 ; 
       FIG. 7A  to  FIG. 7D  are a diagram means of steps of continuous advancement of the constructing means  1  in  FIG. 1  to  FIG. 3  according to the method of the invention; 
       FIG. 8A  and  FIG. 8B  are a diagram means of steps of advancement of the frame  2  and the unit means  3  in  FIG. 1  to  FIG. 3  according to the method of the invention; 
       FIG. 8C  to  FIG. 8F  are a diagram means of steps of rightward turning advancement of the frame member  2  and the unit means  3 ; 
       FIG. 8G  and  FIG. 8H  are a diagram means of steps of leftward turning advancement of the frame member  2  and the unit means  3  in  FIG. 1  to  FIG. 3 ; 
       FIG. 9A  to  FIG. 9F  are a diagram means of steps of rectilinear advancement of the constructing means  1  in  FIG. 1  to  FIG. 3  after its impact with a large surmountable buried ball-shaped boulder, according to the method of the present invention; 
       FIG. 10A  to  FIG. 10D  are a diagram means of steps of leftward turning advancement of the constructing means  1  in  FIG. 1  to  FIG. 3  after its sliding impact with an insurmountable buried ball-shaped boulder, according to the method of the invention; 
       FIG. 11A  to  FIG. 11D  are a diagram means of steps of leftward turning advancement of the constructing means  1  in  FIG. 1  to  FIG. 3  after its stoppage by an insurmountable buried ball-shaped boulder, according to the method of the present invention; 
       FIG. 12A  to  FIG. 12D  are a diagram means of steps of turning advancement of the apparatus with the constructing means  1  in  FIG. 1  to  FIG. 3  round a very large buried boulder, according to the method of present invention; 
       FIG. 13A  to  FIG. 13C  are a diagram of steps of rightward turning advancement of the units means  3  to  6 , the frame member  2 , and the hopper member  16  in  FIG. 12 . 
       FIG. 14  is a side-view, partly in schematic form of a second simplified preferable embodiment of an apparatus for laying an electrical power cable into a curvilinear slit trench of the depth of 1.6 meters and the width of 12 centimetres in the ground that includes large and mainly ball-shaped boulders, according to the present invention; 
       FIG. 15  is a plan view of the apparatus in  FIG. 14 ; 
       FIG. 16  is a side view and partly axial longitudinal vertical cross-sectional view of a constructing means  102  in  FIG. 14  and  FIG. 15 ; 
       FIG. 17  is a plan view and partly cross-sectional view A-A of the constructing means  102  in  FIG. 16 ; 
       FIG. 18  is a front view and partly cross-sectional view B-B of the constructing means  102  in  FIG. 16 ; 
       FIG. 19  is a side-view, partly in schematic form of an embodiment of the apparatus in 
       FIG. 14  and  FIG. 15 , the apparatus adapted for constructing a rectilinear slit trench in an unstable ground; 
       FIG. 20  is a plan view of the apparatus in  FIG. 19 ; 
       FIG. 21  is a side-view, partly in schematic form of a third simplest preferable embodiment of an apparatus for constructing a curvilinear pipe line and granular filling for intercepting and collecting surface flow water in a slit french of the depth of 0.8 meter and the width of 12 centimetres in a clayey ground that includes large and mainly ball-shaped boulders according to the present invention; 
       FIG. 22  is a plan view of the apparatus in  FIG. 21 . 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   The first embodiment of the apparatus is shown in  FIG. 1  to  FIG. 3  and comprises an elongate and preferably vertically disposed structure-constructing means  1  for constructing sections of an excavation such as a slit trench and laying into the section being formed the length of a drain pipe and granulated filter material, that includes an elongate frame member  2  for guiding and supporting components of the constructing means  1 , a plurality of shortened units means  3 , 4 ,  5 , and  6  for controlling the direction of the excavation, compressing side walls, forming and supporting the plane-, conical-, and cylindrically-shaped side walls ahead of the frame member  2 , the units means  3  to  6  are disposed multistonly in narrow side-by-narrow side relationship ahead, and along the length of, and connected to the frame member  2  for movement toward and in an intended diverged advancing direction crossing the central longitudinal surface of the frame member  2  and adapted to excavate the section, force continuously the working end facial wall of the section being formed in directions opposite of the diverged direction and crossing the tangent of the central longitudinal axis of the section, form the side walls and be forced continuously relative to the facial wall in opposite directions crossing the central longitudinal axis of the units means toward the diverged direction to force continuously the frame member  2  from its position toward the intended diverged advancing direction; holding follower members  7 ,  8 ,  9 , and  10  for allowing reciprocating movement of each of the units means  3  to  6  in radial directions about a vertical preferably axis  11 A common preferably and within the central longitudinal surface of the frame member  2  and the units means  3  to  6  and perpendicular to the ground surface, connected to the frame member  2  for movement about the axis  11 A and adapted to hold each of the units means  3  to  6  to be oriented in the radial directions and to locate a position of each of the units means  3  to  6  relative to the frame member  2 , an activating means of the units means such as actuating double-acting hydraulic power rams means  12 ,  13 ,  14  and  15  connected separately to the frame member  2  and the units means  3  to  6  and capable to move relatively and turningly the units means  3  to  6  and the follower frame member  2  about the axis  11 A to advance the curvilinear section; and a next follower hopper member  16  for feeding the length of a drain pipe  17  and filter sand  18  into the section being evacuated by and behind the frame member  2 , and a chassis means  19  for supporting and transporting components of the apparatus and supplying materials and power to the constructing means  1  and movable over the ground along the length of the excavation line, a framework means  20  mounted on the chassis means  19  and adapted to connect the chassis means  19  to the constructing means  1  and to dispose the constructing means  1  into working and transporting positions, and a pressure fluid pumping and controlling means  21  connected to the rams means  12  to  15 , and a reel member  22  for the length of the pipe  17  and a cockpit means  23 . The framework means  20  is supported on the chassis means  19  by hinge members  24  and  25  for movement about a horizontal preferably and transversal axis  26 A and is able to be displaced into a lifted working position  20 A to insert the constructing means  1  from a working position  1 A into the ground and an excavated section and into a lower transporting position for displace the constructing means  1  into a transporting position  1 B by an activating ram means  27 . The framework means  21  comprises an engaging carrier member  28  connected to leg members of the framework means  21  for relative movement along the legs by an activating means such as a winch means (not shown) and provided with a yoke member  29  capable to be forced to move along and relative to the carrier member  28  by an activating means such as lead screw means (not shown) and adapted to engage and urge the carrier member  28  with the frame member  2  to move forward and about the axis  11 A, the axis  26 A and a longitudinal axis  30 A by a pivot staple member  31 . The constructing means  1  is capable to be disposed into the position  1 A and folded about the axis  11 A and an axis  32 A of relative movement between the frame member  2  and the hopper member  16  and displaced into the position  1 B for transportation, and turned about the axis  11 A into working positions  1 C and  1 D for turning advancement of a cylindrical-shaped vertical trench section, and about the axis  30 A into working positions  1 E and  1 F for advancement of inclined rectilinear and vertically conical-shaped excavation sections. The framework means  20  is provided with a guide member  33  for guiding the constructing means  1  being lifted and stop members and an activating means (not shown) for folding and fixing the constructing means  1  in the transporting position. The chassis means  19  comprises guiding wheels  34  connected with a coupling rod member  35  for transportation with a cargo tractor and supporting wheels  36  capable to be forced by the frame member  2  out of engagement with and support on the ground surface for resting the carrier member  28 , the framework means  20 , and the chassis means  19  on the frame member  2  being disposed in the working position. 
     FIG. 4  to  FIG. 6  show the unit means  3  that is similar to the units means  4 ,  5 , and  6  in  FIG. 1  to  FIG. 3  and with the ability to advance the slit trench section toward and in the diverged advancing direction. Its follower holding member  7  is connected to the frame member  2  by opposite hinge members  37  for movement about the axis  11 A and comprises a well-known suitable angle gauge member  38  for remote measuring an angle of deflection of the unit means  3  from its central position and suitable engaging catch lock members  39  and  40  adapted to impede the unit means  3  against deflection from the central position relative to an adjacent from above portion  2 A of the frame member  2  and adjacent from below the follower holding member  8  (in a position  8 A) of the unit means  4  and to release the unit means  3  for deflection aside leftward and rightward because its impact with the buried boulder larger than a predetermined size that is equal to about 25 centimetres of the diameter, for instance. The lock member  39  is provided with a spring member  41  and a cam member  42  mounted on the follower member  7  and capable to be forced into engagement with a socket member  43  (in a position  43 A) of a spring member  44  (in a position  44 A) mounted on the portion  2 A, and the same lock member  40  is provided with a spring member  45  and a socket member  46  that is capable to be forced into engagement with a cam member  47  (in a position  47 A) of a spring member  48  (in a position  48 A) mounted on the follower holding member  8  (in a position  8 A). Because of several variables, forms and dimensions of the lock members  39  and  40  should be determined by testing to provide a disengaging force equal to about 1 to 2 tons, for instance. The unit means  3  comprises a side walls-forming and supporting member  49  adapted to force, form and support the walls and connected to the holding member  7  by opposite slides for movement in radial directions with the ram means  11 . Ends of the ram means  11  are capable to be connected separately to the supplying and controlling means  21  through a co-axial piston rod member and pipe members  50  and channels  51  and conduit members  52  (in a position  52 A) and  53  (in a position  53 A). The forming member  49  is with the ability to be forced to turn about the axis  11 A toward the intended advancing direction and form the conical- and cylindrical-shaped walls and be changed in its volume and expanded and outwardly forced into compressive engagement with the side walls being supported by the member  49  to form the walls and immobilised relative to the walls and shrinked and inwardly forced out of the compressive engagement to easy the its advancement and has side wall-forming and supporting portions  54  being movable reciprocatingly in transversal directions and capable to force, form and engage with the walls and operable to expand the supporting member  49  for forming and compressive engaging with the walls and to shrink the member  49  for releasing from the compressive engaging with the walls by an activating means such as two interacting hydraulic power activating means  55  connected hydraulically to the rod end of the ram means  11  through an usual suitable relief valve means  56  which is able to be open with fluid pressure more than the predetermined quantity of fluid pressure required for effecting movement together of the frame member  2  and the supporting member  49  and by an usual suitable check valve means  57 , which is able to be open for reverse flow of the pressure fluid from the activating means  55  toward the ram means  11  and closed for flow of the fluid toward the activating means  55 , and by return spring members  58 . 
   The unit means  3  comprises an excavation-directing and making cutter member  59  adapted to force continuously the facial wall at the cutter member  59  in a direction crossing the facial wall and opposite of the diverged direction to cause the cutter member  59  to excavate a section of the excavation, be forced continuously toward and in the diverged direction, force continuously the support member  49  and the frame member  2  toward the diverged direction to force and form the side walls toward the diverged direction so to advance the excavation in the diverged direction and control the direction of the excavation, and provided with excavation-making portions capable to force continuously the facial wall in the direction opposite of the diverged direction and crossing the tangent of the central longitudinal axis of the section being formed and be forced continuously by the wall toward the diverged direction and force continuously the support member  49  that being movable part of the frame member  2  and operable by an activating means of the apparatus capable to move the portions relative to and with the support member  49  for controlling the direction and the force of forcing the facial wall and the side walls toward the intended diverged direction and advancing turningly aside the unit means  3  for forming the conical- and cylindrical-shaped side walls and advancing a section of the excavation toward and in the intended diverged direction. The cutter member  59  must correspond to characteristics of the ground, so for the ground that includes large and mainly ball-shaped boulders that is, for instance, the wedge-shaped cutter member connected to the following support member  49  of the frame member  2  by hinge members  60  for movement about an axis  61 A on the central longitudinal surface of the cutter member  59  and the support member  49  and preferably perpendicular to the directions of radial movement of the unit means  3 . The cutter member  59  is able to be forced to move about the axis  61 A through an arc of about 60° by an activating and drive means  62  located between the cutter member  59  and the support member  49  within the section being excavated and comprising an activating motive power means such as a hydraulic power two rods and piston unit means  63  having longitudinally displaceable opposite output piston rod members disposed co-axially with the axis  61 A and a drive turning screw-and-nut mechanism including a cross-head  64  with longitudinally splined bearing portions leaning on correspondingly splined bearing portions of the support member  49  for axial longitudinal displacement and engaging screw-shaped portions  65  being capable of interacting with corresponding engaged screw nut-shaped portions  66  of the member  49 . The rod members of the activating means  63  are able to be forced by fluid pressure for movement along the axis  61 A and forcing relatively the screw portion  65  to the screw nut portion  66  to move the nut portion  66  together with the cutter member  59  about the axis  61 A relatively to the support member  49 . The moved aside, stopped and being advanced cutter member  59  is capable to force the support member  49  remotely from the axis  1 A so to rove the unit means  3  about the axis  11 A correspondingly aside relative to the frame member  2 . Ends of the activating means  63  are able to be connected hydraulically and independently with different ends of the ram means  12  through usual suitable relief valve means  67  capable to be open with fluid pressure more than the predetermined quantity of the fluid pressure required for effecting relative movement between the frame member  2  and member  49  for reverse flow of the fluid from the activating means  63  toward the ram means  12  and closed for flow from the ram means  12  toward the activating means  63 . A rate of an angle of deflection of the cutter member  59  aside leftward and rightward, the rate is depended on a length of a stroke and a form of the screw member  65  and the nut member  66  and equal up to about 30° leftward and rightward and capable to be controlled with a volume of the fluid being fed by the supplying and controlling means  21  into the activating means  63 , for instance. The rate of the angle of deflection of each of the cutter members  59  is determined accordingly to the intended positions  1 C,  1 D,  1 E and  1 F of the constructing means  1  about and distances of the units means  3  to  6  from the axes  11 A,  26 A and  30 A (shown in  FIG. 1  to  FIG. 3 ). The activating and drive means  62  is capable to fix the cutter member  59  to be stationary relative to the frame member  2   
   A method for continuous advancement of a curvilinear and narrow section of an excavation used in the construction of an underground structure, the method is shown for operation of the above-described apparatus for constructing an underground curvilinear and narrow horizontally extending drain pipeline, the method comprising the following steps: (a) operating the activating means of the apparatus to advance the movable chassis means  19  along an excavation line and insert the excavation-directing and making units means  3  to  6  at a working position into the ground to a predetermined depth in the excavation and a distance in an intended advancing direction so that the units means  3  to  6  form the section of the excavation along the excavation line, the direction of the excavation diverges from the central longitudinal axis and is determined; (b) operating the activating and drive means  62  of each of the units means  3  to  6  to move the directing and making cutter members  59  about the axis  61 A relative to the support members  49  into an intended working position for forcing the support members  49  of the follower frame member  2  toward and advancement of the excavation toward and in the diverged direction; (c) operating the activating means of the apparatus to move the support members  49  with the follower frame member  2  in the direction of the tangent of the intended advancing direction at the support members  49  to cause the cutter members  59  of the units means  3  to  6  to excavate the section and force continuously the ground of the facial wall of the section being excavated at the cutter members  59  in a direction crossing the tangent and opposite of the diverged direction to cause the cutter members  59  to be forced and force continuously the support members  49  of the units  3  to  6  to move about the axis  11 A relative to the follower frame member  2  toward the diverged direction so to force continuously and form the side walls at the support members  49  toward the diverged direction and advance the trench toward and in the diverged direction. 
   The activating and drive means  62  and the ram means  12  to  15  of the units means  3  to  6  are located within the section that is formed by forces applied to the walls of the section and the frame member  2  by the directing and making cutter members  59  of the units means  3  to  6 . 
   The method further comprises the following steps: (d) operating the ram means  12  to  15  to advance the cutter member  59  with the support members  49  relative to the frame member  2  with pulling force which must be no more than about 45 tons (and from 20 to 50 tons for the ram means  13  to  15  of the unit means  4  to  6 ) and to stop within the formed section to support the walls; (e) operating the activating means  55  of the units  3  to  6  to move wall-supporting portions  54  of the stopped support members  49  outwardly in opposite directions against and into compressive engagement with the walls of the section to overcome the ground resistance to compression, where the resistance may be equal to about 50 tons (from 25 to 60 tons for the unit means  4  to  6 ) and form the walls and immobilise the support members  49  relative to the walls; (f) operating the activating means  55  of the units means  3  to  6  to effect longitudinal uninterruptible turning movement about the axis  11 A in the opposite directions between the frame member  2  and each of the support members  49  to advance turningly about the axis  11 A the frame member  2  and the rest hopper member  16  and the chassis means  19  relative to the stopped and immobilised support members  49  and turning relatively the frame member  2  and the hopper member  16  about the axis  32 A and the hopper member  16  relative to the excavated section toward and in the diverged advancing direction at a speed, V1, where the speed must be equal to a speed of movement of the constructing means  1  in the same direction with the chassis means  19  to cause the constructing means  1  to decrease the traction by and the overturning moment about the chassis means  20 . 
   The speed V1 of the continuous uniform movement of the frame member  2  relative to the support members  49  is secured by operating the activating means  55  to effect the alternate longitudinal uninterruptible turning movement about the axes  11 A in the opposite directions between the frame member  2  and each of the support members  49 , n, with the same preferably distances and speeds, V2, relative to the frame member  2 , and V3, relative to the ground, where the speeds must be equal to no less than about V2=(0.5n−1)×V1, and V3=0.5n×V1. 
   Referring to  FIG. 7  it may be seen that for continuous movement forward of the constructing means  1  the ram means  12 , for instance, moves the unit means  3  forward as it is shown in  FIG. 7A  relatively to the frame member  2  with the force equal to about 30 t, while the unit means  4 ,  5  and  6  continue to be temporarily stationary and supporting the walls and their ram means  13 ,  14  and  15  continue to move the frame member  2  and the rest forward from and relatively to the unit means  4 ,  5  and  6  with the common traction that is equal up to about 50 t+50 t+20 t=120 tons, for instance, and sufficient for advancement of the apparatus. As soon as the ram means  12  ends its pushing working stroke and stops the unit means  3  ahead of the frame member  2  the ram means  12  starts its pulling stroke with the force 40 t to advance the frame member  2  and the rest relatively to the unit means  3 , and simultaneously the ram means  13  of the unit means  4 , for instance, ends its pulling stroke with the force 50 t (it is shown in  FIG. 7A ) to move the frame member  2  relatively to the unit means  4  and starts at once its pushing stroke with the force 35 t to advance the unit means  4  relative to the frame member  2  (see  FIG. 7B ), while the unit means  3 ,  5  and  6  are stationary and their rams means  12 ,  14  and  15  advance the frame member  2  toward the units means  3 ,  5  and  6  with a common traction that is equal up to about 40 t+50 t+20 t=110 tons and sufficient for the advancement of the apparatus. Then these actions are repeated by the unit means  5  (it is shown in  FIG. 7C ) and the unit means  6  (it is shown in  FIG. 7D ). On that a cycle of actions of the units means  3  to  6  is ended and the same cycles are repeated until the entire predetermined length of the excavation is passed by the constructing means  1  being continuously advanced and simultaneously feeding into and laying the length of the drain pipe and filter sand in the excavated section. 
   Referring to  FIG. 8  it may be seen that the ram means  12 , for instance (see  FIG. 8A ) performs its pushing stroke and advances the unit means  3  relatively to the frame member  2  and in case of an impact with a ball-shaped buried boulder weighing under about 25 kilogram, for instance, the unit means  3  is retained by the lock means  39  and  40  (shown in  FIG. 4  and  FIG. 5 ) in its central position and moves the boulder aside. When the ram means  12  stops the unit means  3  (see  FIG. 8B ), the unit means  3  forces into interaction with to form the walls and moves each of the supporting portions  54  aside in opposite directions by the activating means  55  and simultaneously the ram means  12  starts relative movement together of the unit means  3  and the frame member  2 , and the rest with forcing and forming the side walls by performing its pulling stroke. Just as the ram means  12  ends its pulling stroke, a cycle of actions of the unit means  3  is ended. 
   For turning aside the cutter member  59  of the unit means  3 , for instance from the central position  59 A rightward (see  FIG. 8C ) the supplying and controlling means  21  (see  FIG. 1 ) feeds the pressure fluid into the head end of the ram means  12  under pressure which should be more than the pressure required for effecting the pushing stroke and sufficient for opening the valve means  67  and feeding the fluid into the upper piston rod end of the activating means  63  and connect the piston rod end of the ram means  12  to the hydraulic tank. After the cutter member  59  is turned, the activating means  55  force the portions  54  of the unit means  3  outwardly and simultaneously the ram means  12  advances the frame member  2  and the rest so to force and form the walls as it shown above and in  FIG. 8D . Then the ram means  12  advances the unit means  3 . A left facial wall-forcing portion of the cutter member  59  that is remote from the axis  11 A and deflected rightward and moved forward and compressing the ground to the leftward. This compressed ground is capable of creating a high torque about the axis  11 A and turning the unit means  3  to the rightward as well about the axis  11 A with forcing and forming the right wall. The unit means  3  repeats the suitable actions for further diverging advancement of the excavation (see  FIG. 8E  and  FIG. 8F ) at a radius of curvature equal to about six meters, for instance. For moving the cutter member  59  about the axis  61 A aside to the leftward as it is shown in  FIG. 8G , the supplying and controlling means  21  feeds the pressure fluid into the ram means  12  piston rod end under pressure which should be more than the pressure required for effecting its pulling stroke and sufficient for opening the valve means  67  to feed the fluid into the activating means  63  lower piston rod end and connect the ram means  12  head end to the tank. Then the unit means  3  starts its diverging movement forward to a position in  FIG. 8H  and further as above. 
   In case of a sliding impact of any one of the units means  3  to  6  being advanced, for instance, the unit means  4  with a buried boulder larger than the first predetermined mass, such as about 25 kilogram, but smaller than a second predetermined size of 60 centimetres, for instance (it is shown in  FIG. 9A ), the unit means  4  can push the boulder aside relatively to the frame member  2  and at the same time is forced by the boulder to move aside in an opposite direction relatively to other units means  3 ,  5  and  6 , and the frame member  2  and breaks up the locks means,  39  and  40  of its follower member  8  (shown in  FIG. 1 , and  FIG. 4  to  FIG. 6 ) and is deflected to the leftward, for instance, from a central position  4 A and an intended position  4 B and displaced relatively to the frame member  2  and moving its follower member  8  about the axis  11 A and deforming the deflection angle gauge means  38  (shown in  FIG. 4 ), which is capable of signalling to the controlling means  21  about a direction and an angle of the deflection of the unit means  4  to stop at once all the activating means of the apparatus. Then a position, sizes and shape of the boulder are explored remotely by a well-known suitable measuring means, such as an sonar means to determine when to operate the multiple activating means to effect further advancement of the section being excavated. If there is the boulder of a size smaller than about the second predetermined size, equal to about 50 centimetres in diameter, for Instance, the unit means  4  can move the boulder further aside relatively to the frame member  2  by operating the activating means  55  of the unit means  3 ,  5  and  6  to effect movement of the portions  54  into the members  49  and then operating the rams means  12 ,  14  and  15  to effect advancement of the units means  3 ,  5  and  6  relative to the frame member  2  and stopping them at the same positions  3 ( 5 ,  6 )A in  FIG. 9B , then operating the activating means  55  of the units means  3 ,  5  and  6  to effect movement of the portions  54  outside and operating the rams means  12 ,  14  and  15  to effect advancement of the frame member  2  together with the rest up to the units means  3 ,  5  and  6  and stopping, and repeating these two actions until the units means  3 ,  5  and  6  are at positions  3 ( 5 ,  6 )B and the frame member  2  is at position  2 A and the unit means  4  is at a position  4 C in  FIG. 9C , and when the cutter member  59  is on one side at the boulder then operating the activating means  63  of the unit means  4  to effect movement of the cutter member  59  about the axis  61 A toward and behind the boulder up to a deviated to the rightward position  59 B, and operating the activating means  55  of the units means  3 ,  5  and  6  to effect movement of the units means  3 ,  5  and  6  and stop at the same positions  3 ( 5 ,  6 )C in  FIG. 9D  and again operating the activating means  55  to effect movement of the portions  54  outside and operating the rams means  12 ,  14  and  15  to effect advancement of the frame member  2  together with unit means  4  and the rest up to positions  2 B and  4 D in  FIG. 9D  with pushing the boulder further aside, and repeating the actions until the angle gauge means  38  of the deflected unit means  4  signals to the controlling and supplying means  21  that the deflection angle is come to about nought, and then the controlling and supplying means  21  stops immediately the frame member  2  at a position  2 C and the units means  3 ,  5  and  6  at positions  3 ( 5 ,  6 )D and  4 F in  FIG. 9E  and then operates the activating means  63  of the unit means  4  to effect turning movement of the cutter member  59  from right position  59 A up to its central position in  FIG. 9F  to follow positions of the rest unit means  3 E,  5 E and  6 E and after that operates all the rams means  12  to  15  to effect further continuous movement of the constructing means  1  and apparatus past the boulder. 
   If the exploration discovers that the buried boulder has the third predetermined size, which is equal to about 100 centimetres in diameter, for instance, then it is possible to advance divergingly the constructing means  1  around the boulder by (see  FIG. 10A ) operating the activating means  55  of each of the units means  3 ,  5  and  6  to effect movement of the portions  54  into the members  49  and then operating the rams means  12  and  15  to effect movement of the units means  3  and  6  from their advanced positions  3 A and  6 A backward up and relative to the stopped frame member  2  up to the same positions  3 ( 5 ,  6 )B and operating the activating means  63  of each of the units means  3 ,  5  and  6  to effect movement of its cutter member  59  about the axis  61 A toward the unit means  4  deflected by the boulder from a position  4 A into a position  4 B toward a position  4 C to an angle equal up to about 300 into a position  59 A, and operating alternately the rams means  12 ,  14 , and  15  to effect advancement of the units means  3 ,  5  and  6  with displacing aside toward the unit means  4  and stop at the same positions  3 ( 5 ,  6 )C in  FIG. 10B , then operating the activating means  55  of each of the units means  3  to  6  to effect movement of its portions  54  outside and operating the rams means  12  to  15  to effect advancement of the frame member  2  and the rest relative and up to the units means  3  to  6  from positions  2 A and  4 C into positions  2 B and  4 D, and repeating same suitable operations with advancing alternately the units means  3 ,  5  and  6  and the frame member  2  together with the unit means  4  and the rest through positions  3 ( 5 ,  6 )D,  3 ( 5 ,  6 )E,  2 C and  4 E in FIGS.  10 C and  3 ( 5 ,  6 )E,  3 ( 5 ,  6 )F,  2 D and  4 F in  FIG. 10D  until the angles of deflections of the follower members  8  that being measured by the gauge means  38  shown in  FIG. 6  of all the units means  3  to  6  become the same and the locks means  39  and  40  shown in  FIG. 4  and  FIG. 5  engage together the follower members  7  to  9  of the units means  3  to  5  and then operating the activating and guide means  62  of each of the units means  3 ,  5 , and  6  to effect diverging movement of its cutter member  59  about the axis  61 A into its central position  59 B in  FIG. 10D  and operating all the rams means  12  to  15  to effect advancement of the constructing means  1  and the apparatus toward the predetermined excavation line with repeating the same suitable operations. 
   In case of a central impact of any one of the units means  3  to  6 , for instance, the unit means  4  with a buried boulder of about 50 to 100 centimeters in the diameter (it is shown in  FIG. 11A ), the unit means  4  is stopped by the boulder and a suitable usual transducer means like, for instance, a pressure fluid delivery volume transducer of the controlling and supplying means  21  signals right away to close urgently feeding the rams means  12  to  15  and stop the advancement of the constructing means  1  and the apparatus and after remote exploration of the boulder and determination of a suitable direction of further diverging movement of the units means  3  to  6  the constructing means  1  is advancing around the boulder by operating the activating and drive means  62  of the unit means  4  to effect movement of its cutter member  59  about the axis  61 A toward either a left position  59 A or a rightward position  59 B accordingly to results of the exploration, into the left position  59 A, for example, at an angle equal up to about 30° and operating the ram means  13  to effect advancement and leftward deflection of the unit means  4  relative to the frame member  2  by the boulder accordingly to the deflected position of its cutter member  59  (it is shown in  FIG. 11B ) with breaking the locks means  39  and  40  and moving about the axis  11 A at an angle being measured by the gauge means  38  of its follower member  8  and stop, and operating the activating means  55  of each of the units means  3 ,  5  and  6  to effect movement of the portions  54  into the members  49  and alternately operating the rams means  12 ,  14  and  15  for effecting movement of the units means  3 ,  5  and  6  backward relative and up to the stopped frame member  2  from positions  3 A,  5 A and  6 A and stop at the same positions  3 A( 5 A,  6 A) in  FIG. 11B  and operating the activating and drive means  62  of each of the units means  3 ,  5 , and  6  for effecting turning movement of its cutter member  59  about the axis  61 A leftward toward the direction of the deflection of the unit means  4  at the same angles which should be equal up to about 30° and then alternately operating the rams means  12 ,  14  and  15  of the units means  3 ,  5  and  6  for effecting advancement of them relative to the stopped frame member  2  from the positions  3 A( 5 A,  6 A) and stop at the same positions  3 ( 5 ,  6 )A and operating the activating means  55  of each of the stopped units means  3 ,  5  and  6  to effect movement of its portions  54  outside and again operating the rams means  12 ,  14  and  15  to effect advancement of the frame member  2  together with the rest from its position  2 A and stopping at a position  2 B in  FIG. 11B  and r peat the operations for alternate advancement of the units means  3 ,  5  and  6  into positions  3 ( 5 ,  6 )B and the frame member  2  pushing forward the unit means  4  and pulling forward the rest until the unit means  4  is aside the boulder and stopped, then operating the activating and drive means  62  of the unit means  4  to effect return movement of its cutter member  59  about the axis  61 A rightward up to its central position  59 C in  FIG. 11C  and further repeating the steps to the positions shown as  3 ( 5 ,  6 )C and  3 ( 5 ,  6 )D in  FIG. 11D  until the angle gauge means  38  of the units means  3 ,  5  and  6  at the same positions  3 ( 5 ,  6 )D have signalled to the controlling and supplying means  21  that their deflection angles have become no less than such angle for the unit means  4 , then operating the activating and drive means  62  of each of the units means  3 ,  5  and  6  to effect return movement of its cutter member  59  about the axis  61 A into its central position  59 C and further repeating the suitable operations of the multiple activating means for continuous converging advancement of the excavation toward and then along the line. 
   If the running apparatus came across an insurmountable buried boulder and a rock (see  FIG. 12 ), then the apparatus stops at about five to seven meters distance, for instance, before the boulder (it is shown in  FIG. 12A ) and starts to advance the excavation round the boulder by operating the activating means  55  of each of the units means  3  to  6  to effect movement of its portions  54  into the members  49  and the rams means  12  to  15  to effect alternate backward movement of each of the stopped units means  3  to  6  relative and up to the stopped frame member  2 , and operating the activating and drive means  62  of each of the units means  3  to  6  to effect movement of its cutter member  59  about the axis  61 A from the central position  59 A in a desired rightward direction, for instance, at an angle equal up to about 30° and operating alternately the rams means  12  to  15  to effect turning advancement and stopping of the units means  3  to  6  with breaking and engaging again the locks means  39  and  40  and the activating means  55  to effect movement of the portions  54  inside and outside the support members  49  and operating the rams means  12  to  15  to effect advancement of the frame member  2  together with the hopper member  16  and repeating the operations about ten times, for instance, to reach an end of the way of the rightward turning advancement of the excavation section at the position in  FIG. 12B  and to advance turningly the chassis means from a position  19 A into a position  19 B, then operating the activating and drive means  62  of the units means  3  to  6  to effect leftward movement of the cutter members  59  about the axis  61 A at an angle equal up to about 60° and then repeating same operations about fifteen times, for instance, to effect leftward turning advancement of the excavation section to reach an end of the way of the advancement at the position in  FIG. 12C  and to advance the chassis means into a position  19 C, then operating the activating and drive means  62  of each of the units means  3  to  6  to effect rightward movement of its cutter member  59  about the axis  61 A at an angle equal up to about 60° and repeating the same operations about ten times; for instance, for rightward turning advancement of the excavation section to reach an end of the way of the advancement at the position in  FIG. 12D  and to advance the chassis means into a position  19 D, then operating the activating and drive means  62  to effect movement of the cutter members  59  about the axis  61 A from the position  59 B leftward into the central position. With that the cycle of operations of the constructing means  1  for continuous advancement of the excavation and the chassis means  19  round the very large boulder is ended and the excavation is further advanced along the line. 
   In  FIG. 13  there are shown the following steps of diverging advancement of the excavation without the frequent breaking and re-engaging the locks means  39  and  40  of the follower members  7  to  10  shown in  FIG. 1 ,  FIG. 4  and  FIG. 6 . The steps include operating the activating means  55  of the even, for instance, units means  4  and  6  stopped closely to the frame member  2  to effect movement of the support portions  54  into their support members  49  and the rams means  13  and  15  to effect advancement into and stopping at about the same positions  4 ( 6 )A and operating the activating and drive means  62  of the units means  4  and  6  to effect movement of the cutter members  59  about the axis  61 A from the central position  59 A rightward, for instance, at the angle about 30°, then operating the activating and drive means  62  of the odd units means  3  and  5  stopped closely to the frame member  2  to effect the movement of their cutter members  59  about the axis  61 A at the angle 30° and operating the activating means  55  of the odd units means  3  and  5  to effect movement of the support portions  54  into the support members  49  and operating the rams means  12  and  14  to effect alternate rightward turning advancement and stopping of the odd units means  3  and  5  at about the same positions  3 ( 5 )A in  FIG. 13A  and creating a small acute angle about the axis  11 A between the even units means  4  and  6  on the one hand and the odd units means  3  and  5  on the other hand; then operating the activating means  55  of the even units means  4  and  6  to effect movement of their support portions  54  into their support members  49  and the rams means  13  and  15  to effect advancement and stopping the even units means  4  and  6  at about the same positions  4 ( 6 )A and the activating and drive means  62  of the units means  4  and  6  to effect movement of the cutter members  59  about the axis  61 A from the central position  59 A rightward at the angle about 30°, then operating the rams means  12  to  15  of the units means  3  to  6  to effect advancement of the frame member  2  relative and up to the units means  3  to  6  into a position  2 A and after that repeating the suitable operations to advance alternately the units means  3  to  6  and the frame member  2  into positions  3 ( 5 )B,  4 ( 6 )B and  2 C in  FIG. 13B , and  3 ( 5 )C,  4 ( 6 )C and  2 D in  FIG. 13C . Those positions show that the even advancing units means  4  and  6  and their follower holding members  8  and  10  shown in  FIG. 1  and  FIG. 4  to  FIG. 6  and the odd units means  3  and  5  and their follower holding members  7  and  9  continue to create the constant approximately and very small acute angle that angle is sufficient to prevent the frequent breaking and engaging the locks means  39  and  40  during the diverging advancement of the constructing means  1 . 
   The constructing means  1  is with the ability to control the depth of the excavation section being formed with its movement about the axis  26 A by means of different speeds of relative advancement of the frame member  2  to each of the units means  3  to  6  corresponding to distances of the units means  3  to  6  from the axis  26 A; and to turn about the axis  30 A with movement of the cutter members  59  about the axis  61 A at different angles corresponding to distances of the units means  3  to  6  from the axis  30 A for advancement of inclined straight and conical-shaped sections with relative movement of the units means  3  to  6  to the frame member  2  at different speeds of the working strokes of the rams means  12  to  15  according to distances of the units  3  to  6  from the axis  30 A. 
   Since the set of the four units means  3  to  6  are capable of advancing continuously the constructing means  1  without the traction by the chassis means  19 , so such constructing means is capable to comprise a plurality of the sets of such excavation-directing and making and side walls-forming, engaging and supporting units means connected to a frame member of an any intended working length with the ability to advance very deep excavation sections also without the traction by a chassis means. The number of the units means, their dimensions and the length of a frame member should be determined dependently on characteristics of the ground and the intended structure. A frame member is able to have an any intended thickness of 0.1 to 0.5 metres according to the intended characteristics of the structure, preferably 0.25 metres and the central surface of any intended polygonal, smooth curvilinear and rectilinear shapes. Such apparatus is capable to advance an excavation section round any obstacles such as poles, stubs, wells and the like, and along the length of an excavation line of any smooth shape, and to be used in construction of the underground structures of the depth up to fifteen meters, for instance, and of any desired smooth curvilinear contour, and at any desired transversal slope of the trench equal to about 45 to 135°, while the apparatus advances over and under the ground level and along a wall of a adit. 
   A more simple apparatus for constructing an underground curvilinear and narrow horizontally extending electrical cable, and drain and supplying pipe line of the depth equal to about 1.6 meters in a slit trench being formed of the width of 12 centimetres, for instance, in the loamy ground that includes large and mainly ball-shaped boulders, the apparatus is shown in  FIG. 14  and  FIG. 15  and comprises a chassis means  101  such as a wheeled tractor supporting a means  102  for constructing the trench and laying the cable and supplying the length of the cable  103  and power to the constructing means  102 , the chassis means  101  being movable in an intended advancing direction along the length of a cable line, the constructing means  102  comprising an elongate frame member  104  for guiding and supporting components of the constructing means  102 , a means  105  for directing and making excavated sections to excavate sections ahead of the frame member  104  and force the frame member  104  from its position toward the intended advancing direction and control the direction of the advancement of the excavation, and a means  106  for forcing, forming, engaging, and supporting the side walls of the sections and is adapted to be disposed in working positions and extended into the ground up to a predetermined depth and distance toward and in the intended advancing direction to excavate, form, and support the side walls of an excavated section being formed along the length of the line to lay the length of the cable  103  into the excavated section, and a supporting framework means  107  mounted on the chassis means  101  and adapted to support the constructing means  102  on the chassis means  101  for vertical movement to raise the constructing means  102  into a transporting position and to lower into working positions and to shift the chassis means  101  to follow the constructing means  102  in the intended advancing direction, the framework means  107  comprises a carrier member  108  that is forced into engagement with the frame member  104  and adapted to connect the chassis means  101  and the constructing means  102  for movement. 
   The frame member  104  is engaged with the carrier member  108  by a pivotal connection  109  for movement about an axis  110 A behind the constructing means  102 , within the central longitudinal surface of the frame member  104  and the carrier member  108 , and preferably perpendicular to the advancing direction and the road surface and has a cable-laying guide  111 . 
   The directing and making means  105  is provided with a plurality, four, for example, of shortened excavation-directing and making members  112  to  115  that are corresponding to the characteristics of the ground and each spaced and supported by the frame member  104  for relative movement about an axis  116 A between and within the central longitudinal axis of the frame member  104  and the making member  112  to  115  and perpendicular preferably to the advancing direction by a drive means  117  (not shown in  FIG. 14  and  FIG. 15 ). 
   The side walls-supporting means  106  adapted to advance continuously and securely the apparatus relative to the side walls and comprises a plurality, four for example, of side wall-forcing, forming, engaging and supporting units means  118  to  121  each supported on the frame member  104  for displacement in longitudinal direction and double-acting hydraulic rams means  122  to  125  to move longitudinally and separately each of the units means  118  to  121 , which rams means  122  to  125  are pivotally secured at the rear to the frame member  104  and each connected via a thrust journal to a respective associated unit means  118  to  121 . 
   Each of the means  104 , and  112  to  115  and  118  to  121  is capable of being forced into interaction with the walls of the section being formed to urge the constructing means  102  in a direction crossing the central longitudinal axis of the excavated section toward the intended advancing direction and has excavation-directing portions for forcing the walls in the crossing direction, where the portions are operable to move the constructing means  102 , with the means  104 ,  112  to  115 , and  118  to  121  relative to the walls being forced toward the direction by an activating means of the apparatus capable of forcing the portions against the walls. 
   The directing and making members  112  to  115  have the ability to control the direction of the excavated section and the portions have the ability to control the force and direction of deformation of the working end facial wall of the excavated section being formed. 
   The directing and making members  112  to  115  are capable of forcing the facial wall in a direction crossing on the sides of the axis of turning advancement of the excavated section, and the chassis means  101  is adapted to be moved about the axis, where the carrier member  108  that is adapted to urge the chassis means  101  about the axis to follow the constructing means  102  while the excavated section is being advanced so that the direction of the transportation of the chassis means can be controlled. 
   Each of the making members  112  to  115  and the follower frame member  104  and the carrier member  108  are connected in consecutive order, relative to the advancing direction, for movement about the axes  116 A and  110 A preferably parallel mutually and perpendicular to the road surface and within the central longitudinal surfaces of the adjacent members  112  to  115 ,  104 , and  108  with the ability to interact with the walls to urge the members in the lateral direction in the formation of the excavated section, where the excavation-directing portions are capable of deforming the ground to form the side walls into a cylindrical shape and are operated by the activating means to move the members about the axes  116 A and  110 A in order to move the members along the length of the section. 
   The framework means  107  comprises parallel pairs of forwardly extending and parallelogram-forming arm members  126  and  127 , and activating double-acting rams means  128  for effecting lowering and raising the paired arm members  126  and  127 , and actuated extension telescopic lifts means  129  supporting the carrier member  108  for vertical movement into working and transporting positions at the start, during and completion of each cable laying operation, and stops fixing the constructing means about the axis  110 A in the transporting position (not shown). The forward ends of the paired arms  126  and  127  are pivotally connected to guiding and supporting frame members  130  of the lifts means  129  upon pairs of pins  131  and  132 . The framework means  107  is with the ability to lean the chassis means  101  upon the frame member  104  lowered into the working position for advancement. 
     FIG. 16  to  FIG. 18  show a section of the constructing means  102  comprising the directing and making member  114 , for instance, that is similar to the rest sections comprising the making members  112 ,  113 , and  115 . The making member  114  comprises an oriented forward directing and making wedge-shaped making cutter member that corresponding to the ground including the boulders and has wedge-shaping making cutting portions  133  and  134 , and the drive means  117  located within the excavated section to effect the relative movement about the axis  116 A between the making member  114  and the supporting follower frame member  104 . The making member  114  has the ability to be forced to move about the axis  116 A of the frame member  104  and is adapted to urge the frame member  104  to move about the follower axis  110 A of the carrier member  108 . 
   The drive means  117  comprises a means  135  for providing motive power that having a piston and a double in opposite directions from the piston and displaceable along the axis  116 A output rod  136  including castellated portions  137  leaning on corresponding castellated bearings of the support portion  138  of the frame member  104  for axial longitudinal displacement and for engaging screw-shaped splined portions  139  capable of interacting with corresponding engaged screw-shaped splined portions  140  of the making member  114 . 
   The wedge-shaping portions  133  and  134  of the cutter members  112  to  115  are remotely located from the axis  110 A of the movable connection of the frame member  104  and the carrier member  108  and are operable to move the frame member  104  about the axis  110 A by the multiple activating means of the apparatus that capable of moving the constructing means  102  forward and the drive means  117  capable of rotating the making members  112  to  115  about the axis  116 A relative to the frame member  104 . 
     FIG. 16  to  FIG. 18  show also the unit means  120  that is similar to the units means  118 ,  119 , and  121  in  FIG. 14 . The unit means  120  comprises a frame member  141  for supporting components of the unit means  120  and opposite side wall-forcing, forming, engaging, and supporting members  142  and  143  having the ability to be forced against and into compressive engagement with the side wall and adapted to form and support the wall and urge the frame member  104  forward relative to the walls and connected to opposite slides  144  and  145  of the frame member  104  for movement in radial directions about the axis  110 A by the ram means  124 . Ends of the ram means  124  are capable to be connected separately to a means for supplying the pressure fluid (not shown) on the chassis means  101  through a co-axial piston rod member  146  and opposite pipe members  147  (second pipe member not shown). The unit means  120  is with the ability to be forced to advance turningly about the axis  110 A toward the intended advancing direction and form the cylindrical-shaped walls and be expanded and outwardly forced into compressive engagement with the side walls being supported by the side wall-supporting members  142  and  143  to immobilise the supporting members  142  and  143  relative to the walls and be shrinked and inwardly forced out of the compressive engagement with the walls to easy advancement and has side wall-forming and supporting plates  148  and  149  reciprocatingly movable in transversal directions that are capable to compressively engage the walls of the excavated section and are operable to expand for immobilising the unit means  120  relative to the walls by an activating means such as two interacting hydraulic power rams means  150  and  151  capable to outwardly capable to outwardly move the plates  148  and  149  to engage compressively the walls and move the plates  148  and  149  relative to the adjacent supporting member  142  and  143  and connected hydraulically to the rod end of the ram means  124  through an usual suitable relief valve means  152  which is able to be open with fluid pressure more than the predetermined quantity of fluid pressure required for effecting movement together of the frame member  104  and the supporting members  142  and  143  and by an usual suitable check valve means  153 , which is able to be open for reverse flow of pressure fluid from the rams means  150  and  151  toward the ram means  124  and closed for flow of the fluid toward the rams means  150  and  151 , and by return spring members  154 . 
   The continuous advancement of a curvilinear and narrow section of a slit trench used in the construction of an underground cable being realised by a method comprising the following steps: 
   (a) operating the activating means of the chassis means  101 , the activating rams means  128 , and the lifts means  129  of the framework  107  on the chassis means  101  of the apparatus for constructing the trench, the multiple activating means moves the means  102  for constructing the underground cable into a working position on a trench line; 
   (b) operating the activating means of the chassis means  101  and the constructing means  102  to insert the means  105  for directing and making the trench at the working position into the ground to a predetermined depth and distance in the excavation and in an intended advancing direction, so that the means for directing and making forms the section of the trench along the excavation line, the direction of the excavation diverges from the tangent of the central longitudinal axis of the section and is determined, 
   (c) operating the activating means of the chassis means  101  and the constructing means  102  to insert into and move the supporting frame member  104  of the constructing means  102  in the excavated section along the tangent to cause the directing and making means  105  to excavate the section; 
   (d) operating the drive means  117  of the constructing means  102  to move the directing and making means  105  to force the ground of the working end facial wall of the excavated section at the directing and making means  105  in a direction opposite to the diverged direction to cause to be forced toward the diverged direction and force the frame member  104  to form the side wells at the frame member  104  toward the diverged direction so to advance the trench in the diverged direction to evacuate the section and the length of the cable to be let into the excavated and evacuated section, where the drive means  117  is located within the section that is formed by forces applied to the walls of the section by the directing and making means  105  and the frame member  104 ; 
   (e) operating the rams means  122  to  125  of the constructing means  102  to advance the side wall-forming and supporting units means  118  to  121  of the means  106  for forming and supporting the side walls, the means  106  being part of the constructing means  102 , turningly about the axis  110 A of connection  109  the frame member  104  and the carrier member  108  toward and in the diverged direction and stop in advanced positions within the excavated section to form and support the walls, 
   (f) operating activating rams means  150  and  151  of the forming and supporting members  142  and  143  of the forming and supporting means  106  to move wall-forming and supporting plates  148  and  149  of the stopped forming and supporting members  142  and  143  outwardly in opposite directions against and to form the walls of the section; 
   (g) operating the activating rams means  128  and the lifts means  129  of the framework  107  to lean the forward part of the chassis means  101  upon the frame member  104  so to keep the constructing means  102  in the intended working depth; 
   (h) operating the activating rams means  122  to  125  of the constructing means  102  to move the frame member  104  about and relative to the axis  110 A of the carrier member  108  in the advancing turning direction at a speed, V 1 , where the speed must be equal to a speed of turning the constructing means  102  in the same direction by the activating means of the chassis means  101  to cause the constructing means  102  to decrease the traction by and the overturning moment about the chassis means  101 , and where the speed V 1  of the continuous uniform turning the frame member relative to the forming and supporting means is secured by operating the activating means of the constructing means to effect the alternate uninterruptible turning in the opposite directions between the frame member and each of the side walls forming and supporting members, n, with the same preferably distances and speeds, V 2 , where the speeds must be equal to no less than about (0.5n−1)×V 1  relative to the frame member, and 0.5n×V1 relative to the ground. 
   The method further comprises stopping the constructing means  102  by the multiple activating means of the apparatus right away when the constructing means  102  accidentally runs against a buried obstacle, and remotely exploring a position, shape, and dimensions of the buried obstacle by a well-known suitable measuring means to determine when to operate the multiple activating means to effect further advancement of the section, and selectively operating the multiple activating means of the apparatus in accordance with results of the measuring means. 
   The apparatus is especially useful in unstable grounds of a rough country that are difficult for crossing, such as a hover and loose, moist, moody and clayey, watered and waterlogged ground that includes large boulders. An important advantage of the apparatus in addition to the cancelled draft forces required is the relative smooth compressed condition of the side walls of the trench. Since the walls are tightly compacted, the earth will have little tendency to fall to the bottom of the trench. Accordingly, the cable can be reliable laid in a variety of different kinds of ground at a constant depth since there is little tendency for falling earth to accumulate periodically in piles at the bottom of the trench. Another important benefits obtained through the use of the apparatus is the ability of the constructing means to clear obstacles such as boulders and rocks, It is believed to be due to the tendency for the forward wedge-shaping portions of the cutter member when contacting a boulder located, for example, on its left side to force the supporting frame member toward the right as the forward portion of the cutter moves forward with the frame member by the rams means of the constructing means. The frame member being supported on the side wall-supporting members being supported on the compressed side walls so the frame member tends to remain moving rectilinearly as the wedge-shaping portion of the cutter moves the boulder to the left. In this way the cutter and the entire apparatus tends to work its way around the boulder. The constructing means is with the ability to advance turningly around the very large insurmountable boulder and rock. The apparatus has no tendency to damage or kink cables and the large radius of the rearward edge of the guide will subject the cable to a minimum of stress as it is laid. 
   For brevity the term “material” is used in the claims as the material to be laid, and it is to be understood that this term is intended to encompass a conduit such as electrical cable for electrical current, signals, sounds, or light as well as pipe for flow of water or other liquid, and a hardening liquid such as cement milk mixed with bentonite, earth or sand to form a soil-cement wall. 
   The sizes of the constructing means should be sufficient to construct an intended underground structure. In a typical cable or pipe laying operation the depth of laying will usually be from 0.8 meter up to about 4.0 meters with about 1.6 meter being typical, the width of a slit trench will usually be from 6 centimeters up to 20 centimeters with about 12 centimeters being typical. In a typical underground wall constructing operation the depth of constructing will usually be from 2 meters up to about 25 meters with about 10 meters being typical. 
   A third preferred embodiment of an apparatus for constructing an underground curvilinear and narrow horizontally extending structure such as a drain pipe line and granular filling for intercepting and collecting surface water in an excavation such as a slit trench being formed of the depth equal to about 0.8 meter and the width equal to about 12 centimeters, for instance in the clayey ground, that includes large and mainly ball-shaped boulders, the apparatus is shown in  FIG. 19  and  FIG. 20  and comprises a chassis means  201  such as a caterpillar tractor supporting a means  202  for constructing the underground drain and supplying a length of the drain pipe  203 , a volume of granular loose material  204  and power to the constructing means  202 , the chassis means  201  being movable along the length of an intercepting drain pipe line, where the constructing means  202  comprises an elongate frame member  205  for guiding and supporting components of the constructing means  202 , a means  206  for directing and making excavated sections to excavate trench sections ahead of the frame member  205  and force the frame member  205  from its position toward the intended advancing direction and control the direction of the advancement of the trench, and is adapted to be disposed in working positions and extended into the ground up to a predetermined depth and distance toward and in the intended advancing direction to excavate and form the side walls of an excavated section being formed along the length of the line to lay the length of the drain pipe  203  and the volume of the granular material  204  into the excavated section, and a supporting framework means  207  mounted on the chassis means  201  and adapted to support the constructing means  202  on the chassis means  201  for vertical movement to raise the constructing means  202  into a transporting position and to lower into working positions, the framework means  207  comprises a carrier member  208  that is forced into engagement with the frame member  205  and adapted to connect the chassis means  201  and the constructing means  202  for movement. 
   The frame member  205  is engaged securely to the carrier member  208  and has a pipe-laying guide  209  and a guide  210  for laying the granular material being supplied from a bunker  211  supported on the frame member  205 . 
   The directing and making means  206  is provided with an excavation-directing and making member  212  corresponding to the characteristics of the ground that includes the boulders and having a forward-oriented wedge shape and supported by the frame member  205  for relative movement about an axis  213 A between and within the central longitudinal axis of the frame member  205  and the making member  212  and perpendicular preferably to the advancing direction and the road surface and a drive means  214  (not shown in  FIG. 19  and  FIG. 20 ) for effecting the turning movement. 
   Each of the members  205  and  212  is capable of being forced into interaction with the walls of the section being formed to urge the constructing means  202  in a direction crossing the central longitudinal axis of the excavated section toward the intended advancing direction and has excavation-directing wedge-shaping portions  215  and  216  and plates  217  and  218  for forcing the walls in the crossing direction, where the portions are operable to move the constructing means  202 , with the members  205  and  212  relative to the walls being forced toward the direction by an activating means of the apparatus capable of forcing the portions against the walls. The member  212  has the ability to control the direction of the excavated section and the portions  215  and  216  have the ability to control the force and direction of deformation of the working end facial wall of the excavated section being formed. 
   The member  212  is capable of forcing the facial wall in a direction crossing on the sides of the axis of turning advancement of the excavated section, and the chassis means  201  is adapted to be moved about the axis, where the carrier member  208  that is adapted to urge the chassis means  201  about the axis to follow the constructing means  202  while the excavated section is being advanced so that the direction of the transportation of the chassis means  201  can be controlled. 
   The member  212  and the frame member  205  are with the ability to interact with the walls to urge the members  212  and  205  in the lateral direction in the formation of the excavated section, where the excavation-directing portions  215  and  216  are capable of deforming the ground to form the side walls into a cylindrical shape and are operated by the activating means to move the member  212  about the axis  213 A in order to move the members along the length of the section. 
   The framework means  207  comprises parallel pairs of forwardly extending and parallelogram-forming well-known arm members  219  and  220 , and activating double-acting rams means  221  for effecting lowering and raising the paired arm members  219  and  220  for vertical movement of the constructing means  202  into working and transporting positions at the start, during and completion of each intercepting drain laying operation. The forward ends of the paired arm members  219  and  220  are pivotally about transversal axes connected to the carrier member  208  upon pairs of pins  222  and  223 . 
     FIG. 21  and  FIG. 22  show a section of the constructing means  202  comprising the directing and making member  212  and the drive means  214  located within the excavated section to effect the relative movement about the axis  213 A between the making member  212  and the frame member  205 . The member  212  has the ability to be forced to move about the axis  213 A of the frame member  205  and is adapted to urge the frame member  205  to move about the axis of turning advancement of the slit trench. 
   The drive means  214  comprises a means  224  for providing motive power that having a piston and a double in opposite directions from the piston and displaceable along the axis  213 A output rod  225  including castellated portions  226  leaning on corresponding castellated bearings of the support portion  227  of the frame member  205  for axial longitudinal displacement and for engaging screw-shaped splined portions  228  capable of interacting with corresponding engaged screw-shaped splined portions  229  of the making member  212 . 
   The portions  215  and  216  of the cutter member  212  are remotely located from the centre of the turning advancement of the chassis means  201  and are operable to move the frame member  205 , the carrier member  208 , and the chassis means  201  about the centre by the multiple activating means of the apparatus that capable of moving the constructing means  202  forward and the drive means  214  capable of rotating the making member  212  about the axis  213 A relative to the frame member  205 . 
   The advancement of a curvilinear and narrow section of a slit trench used in the construction of an underground intercepting drain line being realised by a method comprising the following steps: 
   (a) operating the activating means of the chassis means  201  and the activating rams means  219  of the framework  207  on the chassis means  201  to move the constructing means  202  into a working position on a trench line; 
   (b) operating the activating means of the chassis means  201  to insert the means  206  for directing and making the trench at the working position into the ground to a predetermined depth and distance in the excavation and in an intended advancing direction, so that the means for directing and making forms the section of the trench along the excavation line, the direction of the excavation diverges from the tangent of the central longitudinal axis of the section and is determined, 
   (c) operating the activating means of the chassis means  201  to insert into and move the supporting frame member  205  of the constructing means  202  in the excavated section along the tangent to cause the directing and making means  206  to excavate the section; 
   (d) operating the drive means  214  of the constructing means  202  to move the directing and making means  206  to force continuously the ground of the working end facial wall of the excavated section at the directing and making means  206  in a direction opposite to the diverged direction to cause the making means  206  to be forced continuously relative to the wall toward the diverged direction and force continuously the frame member  205  to form the cylindrical-shaped side walls at the frame member  205  toward the diverged direction so to advance the trench toward and in the diverged direction, evacuate the section, and the length of the drain pipe and a volume of granulated material to be let into the excavated and evacuated section, where the drive means  214  is located within the section that is formed by forces applied continuously to the walls of the section by the directing and making means  206  and the frame member  205 . 
   The method further comprises stopping the constructing means  202  by the multiple activating means of the apparatus right away when the constructing means  202  accidentally runs against a buried obstacle, and remotely exploring a position, shape, and dimensions of the buried obstacle by a well-known suitable measuring means to determine when to operate the multiple activating means to effect further advancement of the section, and selectively operating the multiple activating means of the apparatus in accordance with results of the measuring means. 
   The apparatus is especially useful for constructing intercepting and collecting drains of a drain pipe of the diameter 4-5 centimeters and very permeable granular loose filling material along the horizontals of the ground surface in weak-permeable ground being flooded with flowing surface water. It may be also useful for laying a cable and supplying pipe of the diameter up to about 16 centimeters. 
   The wedge-shaping angle of the wedge-shaped cutter should be equal from about 25°-60° with about 30° being typical, the size of the arc through which the wedge-shaped cutter turns is not considered critical but in general the characteristics of the screw-shaped portions and the strike of the motive output rod should be sufficient to rotate the wedge-shaped cutter from the full left position to the full right position a total angle that should be equal up to 60° so the angle between the advancing direction and the forward wedge-shaping portion should be not more than 45°. 
   The wedge-shaping angle of the wedge-shaped cutter should be equal from about 25-60 with about 30 being typical, the size of the arc through which the wedge-shaped cutter turns is not considered critical but in general the characteristics of the screw-shaped portions and the strike of the motive output rod should be sufficient to rotate the wedge-shaped cutter from the full left position to the full right position a total angle that should be equal up to 60° so the angle between the advancing direction and the forward oriented wedge-shaping portion should be not more than 45°. 
   The sizes of side wall-supporting members should be sufficient to support the side walls against collapse and create an intended traction for movement of the constructing means and advancement of the apparatus. 
   For brevity the term “an intended advancing direction” is used in the claims as the direction to be gone, and it is to be understood that this term is intended to encompass a horizontal direction of extending of an underground structure such as cable and pipe; and horizontal, inclined, and vertical preferably anchor, foundation, diaphragm, and drain stratum and wall; and an inclined and vertical preferably direction of extending of an anchor and foundation pile, column, and wall; and drain and supplying well. 
   Accordingly, the term “a chassis means” is to be understood that this term is intended to encompass a caterpillar and wheeled tractor, trailer, track, and trolley; and the term “a framework means” is intended to encompass a slit and slot trencher, and a pile driver. 
   It is apparent that the invention may be employed in many configurations, modifications and variations other than the specific forms and embodiments are described and given hereinbefore by way of example only without departing from the essential scope, spirit, and substance thereof and the scope of the invention is defined and limited only by the terms of the appended. Claims, including also all subject matter encompassed by the doctrine of equivalents as applicable to the claims.

Summary:
A slit trench-excavating plough has an elongate frame supporting components of the plough, a number of side wall-supporters movable longitudinally, about and laterally relative to the frame, a number of wedge-shaped cutters pivoted laterally relative to the supporters. The cutters can be turned by an underground driver coupled between the cutter and the supporter to control the direction of excavation and steer the apparatus. The supporters can be moved by the drivers and rams coupled between the frame and the supporters simultaneously in opposite directions to advance the apparatus continuously.