Patent Publication Number: US-2022213681-A1

Title: Surface treatment device and surface treatment method

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is the U.S. national phase of International Application No. PCT/JP2020/019861 filed May 20, 2020 which designated the U.S. and claims priority to Japanese Patent Application No. 2019-099304 filed May 28, 2019, the entire contents of each of which are hereby incorporated by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to a surface treatment (processing) device (apparatus) and a surface treatment (processing) method for applying a foam material and other materials covering the foam material onto a surface of a treatment (process) object such as a roof of a building. 
     Description of the Related Art 
     For example, in a metal folded-plate roof of a large building such as a factory, a warehouse, a commercial facility, etc., it is necessary to apply a coating at a predetermined time interval in order to protect the metal portion and to secure waterproofness, rust prevention, heat insulating property, etc. 
     In recent years, it has been proposed to spray a foamable resin material onto a roof to form a heat-insulating foam layer on the roof surface. 
     For example, Patent Document 1 describes that a heat-insulating foam layer made of a resin foaming agent is formed on a surface of a roof or the like by spraying, and a reinforcing waterproof layer made of a high-strength resin having a waterproof property etc. is formed on the surface of the heat-insulating foam layer by spraying. 
     Further, as a prior art relating to automation of a roof painting etc., for example, Patent Document 2 discloses a painting apparatus for a folded-plate roof formed by periodically bending a metal plate into concave-convex, on the apparatus a nozzle is mounted on a carriage which travels along a valley portion of a folded-plate roof. 
     PRIOR ART DOCUMENTS 
     Patent Documents 
     
         
         Patent document 1: JP 2010-168878A 
         Patent document 2: JP H 11-207221A 
       
    
     SUMMARY OF THE INVENTION 
     Conventionally, a surface treatment using a material having foaming properties as described in Patent Document 1 has been carried out in such a way that a worker holds a spray gun equipped with a nozzle and goes up on a roof. 
     In this case, a worker places a temporary scaffold on a roof, and the worker stands on the scaffold and sprays the foaming resin onto a predetermined area, then the worker moves the scaffold in order to perform the treatment of an adjacent area. 
     However, in this case, a boundary portion between the previously treated area and the later treated area may sometimes be doubly sprayed with the foamable resin, resulting in a locally increased thickness of the foam heat-insulating layer. 
     When the coating thickness of the foamable resin is locally increased as described above, a loss of the raw material is caused. Further, when such a portion is formed along a direction orthogonal to an inclination direction of the roof, rainwater flowing down from the upper portion of the roof is dammed up, which causes deterioration in drainage and waterproofness. 
     Besides, in the heat-insulating foam layer made of a foamable resin, the reactive groups on the surface of the resin layer decrease with time after spraying, and the surface deterioration due to ultraviolet rays progresses, and the adhesion strength with the coating agent decreases. Further, it is discolored by the influence of ultraviolet rays, and the surface becomes brittle, thereby deteriorating the physical properties of the foam. Therefore, it is preferable to apply the coat layer immediately (for example, within a few hours) after the foamable resin is sprayed and foamed, but by the above-described manual operation of the worker, it has been unavoidable that a certain length of time is required until the coating of the coat layer after the spray of the foamable resin. 
     On the other hand, it is conceivable to apply a heat-insulating foamed layer made of a foamable material using a self-propelling coating apparatus as described in the reference document 2, and further to form a reinforcing waterproof layer on the surface. 
     However, in this apparatus, it is not taken into consideration that plural kinds of liquid agents are sprayed by this coating apparatus. When an insulating foam layer and a reinforcing waterproof layer are respectively formed by two independent coating apparatuses, an operation process becomes extremely complicated, and it is inevitable that a long time is required until a reinforcing waterproof layer forming after a heat insulating foamed layer is formed. 
     In addition, as described in  FIG. 5  of reference document 2, a nozzle is arranged so as to be directed toward a top surface of a mountain portion of a folded-plate roof. When a material having foaming properties is sprayed in this way, there is an anxiety that the heat insulating foam layer becomes locally thick at the top surface of the mountain portion, resulting in a so-called mushroom like bulging cross section, which wastes raw material and has an adverse effect on drainage of rainwater etc. 
     In view of the above problems, it is an object of the present invention to provide a surface processing apparatus and a surface processing method which improve the quality of a surface treatment using a material having foaming properties. 
     The present invention solves the above problems by the following solution means. 
     A surface processing apparatus comprises a moving body movable along the surface of a processed object, a first spray device provided on the moving body that sprays a first material having foaming properties on the surface of the processed object, and a second spray device provided on the moving body that sprays a second material for coating a surface of the first material on an area where the first material is already sprayed from the first spray device on the surface of the processed object. 
     According to this configuration, by spraying the first material and the second material while travelling the moving body along the surface of the process object, variation (unevenness) in the coating thickness of each material can be suppressed. 
     Further, by providing the first spray device and the second spray device on the same moving body, it is easy to apply the second material within a short time after the application of the first material, and the quality of the surface treatment can be improved. 
     In a further embodiment, the process object is a roof inclined with respect to a horizontal plane, and the surface processing apparatus is further characterized in that the first spray device and the second spray device perform a spray in a state in which the moving body moves along an inclination direction of the roof. 
     According to this configuration, by arranging the feeding direction of the moving body at the time of spraying the first material and the second material along the inclination direction of the roof, it is possible to prevent the formation of the unevenness extending in the direction orthogonal to the inclination direction (typically, the horizontal direction) and to secure the drainage property of rainwater etc. 
     Note that, in the present specification and claims, an inclination direction of a roof means a direction from a ridge side provided at an upper portion of a roof toward an eaves side provided at a lower portion of a roof (a drain direction such as rainwater), and includes a direction in which an inclination of a roof relative to a horizontal plane is maximized. 
     In another embodiment, the process object is a roof inclined with respect to a horizontal plane, the roof having mountain portions protruding upward and extending along one direction and valley portions which are concave portions sandwiched between the mountain portions alternately arranged in parallel, and the surface processing apparatus is further characterized in that the first spray device and the second spray device perform a spray in a state in which the moving body moves along a longitudinal direction of the mountain portion and the valley portion of the roof. 
     According to this configuration, by spraying the first material and the second material while travelling along the longitudinal direction of the mountain portions and the valley portions of the folded-plate roof, the above-described effect can be certainly obtained. 
     In yet another embodiment, the surface processing apparatus is further characterized in that the moving body has a rolling element which runs along the valley portion of the roof. 
     According to this configuration, by utilizing the valley portion of the folded-plate roof as a rail for guiding the movement of the moving body, it is possible to move the moving body with sufficient accuracy with a simple configuration. 
     In yet a further embodiment, the roof has an slope portion which is provided at a boundary portion between the mountain portion and the valley portion and which is inclined with respect to a projecting end surface of the mountain portion and a bottom surface of the valley portion respectively, the surface processing apparatus is further characterized in that a nozzle axis of at least one of the first spray device and the second spray device is arranged to be directed toward the slope portion. 
     According to this configuration, by spraying the first material and/or the second material toward the slope portion where it is difficult to secure a sufficient coating thickness, it is possible to secure a sufficient coating thickness on the slope portion and prevent an excessive increase in the coating thickness at the projecting end surface. 
     In a different embodiment, the surface processing apparatus  5  is further characterized in that at least one of the first spray device and the second spray device is arranged so that the nozzle axis is movable between a 1st state in which the nozzle axis is directed to the slope portion adjacent to one side of the valley portion and a 2nd state in which the nozzle axis is directed to the slope portion adjacent to the other side of the valley portion. 
     According to this configuration, it is possible to simplify the configuration of the apparatus by performing a spray onto the slope portions inclined in different directions by a common spray device while changing the state of the spray device. 
     In particular, it is possible to simplify the configuration of a compressor etc. which delivers a coating under pressure, and it is possible to reduce the equipment to be prepared on the ground, for example, when it is applied to a roof. 
     In a different embodiment, the surface processing apparatus is further characterized in that the moving body is movable along the surface in a direction different from a direction of movement of the body at a time when at least one of the first spray device and the second spray device performs a spray. 
     According to this configuration, after the first material and the second material are sprayed while travelling the moving body, the moving body is fed in a direction different from the travelling direction at that time, and the same processing is repeated, whereby a wide range of treatment can be performed easily and with high quality. 
     In yet a further embodiment, the surface processing apparatus is further characterized in that the apparatus comprises a rail portion contacting with the surface for guiding the moving body along the surface toward a direction different from the moving direction at the time when at least one of the first spray device and the second spray device sprays, and a moving body separating portion provided between the moving body and the rail portion for altering a space between the moving body and the rail portion toward a direction to which the moving body apart from the surface. 
     According to this configuration, it is possible to appropriately obtain the above-described effect with a lightweight and simple configuration. 
     In a further embodiment, the surface processing apparatus is further characterized in that the second spray device has a function of spraying the second material multiple times on an area where the first material has been sprayed by the first spray device. According to this, it is possible to apply, for example, a material having a waterproof property etc. to a sufficient coating thickness on the surface of the material having foaming property, and to further enhance the treatment quality. 
     In a different embodiment, the surface processing apparatus is further characterized in that a point of contact with the moving body on the surface, a directed point of the nozzle axis of the first spray device, and a directed point of the nozzle axis of the second spray device are separately arranged to each other and sequentially arranged in a direction different from a direction of movement of the moving body during a time when at least one of the first spray device and the second spray device performs spraying. 
     According to this configuration, the first spray device and second spray device spray onto a different mountain portion or a valley portion in the same travelling stroke of the moving body, so that the second material can be sprayed at an appropriate time interval after the first material has been sprayed. 
     In another embodiment, the surface processing apparatus is further characterized in that the moving body contacts the surface at only one direction side in a direction orthogonal to a moving direction of the moving body at the time when the spray is performed toward an area to which the first spray device and the second spray device spray the first material and the second material onto the surface. 
     According to this configuration, by sequentially feeding the moving body in a direction away from the already sprayed area, it is possible to prevent the moving body from travelling on the surface of the area in which the foamable material is sprayed, and to protect the already treated surface and further enhance the treatment quality. 
     A surface processing method is characterized in that a first material having foaming property is sprayed onto a surface of a processed object using a first spray device provided on a moving body movable along the surface of the processed object in a state in which the moving body is being moved, and a second material, for coating an area after the first material is sprayed on the surface of the object, is sprayed using a second spray device provided on a moving body in a state in which the moving body is being moved. 
     In another embodiment, the process object is a roof inclined with respect to a horizontal plane, and the surface processing method is further characterized in that the first spray device and the second spray device perform a spray in a state where the moving body moves along the inclination direction of the roof. 
     In yet another embodiment, the process object is a roof inclined with respect to a horizontal plane, the roof having mountain portions protruding upward and extending along one direction and valley portions which are concave portions sandwiched between the mountain portions alternately arranged in parallel, and the surface processing method is further characterized in that the first spray device and the second spray device perform a spray in a state in which the moving body moves along the longitudinal direction of the mountain portion and the valley portion of the roof. 
     In a further embodiment, the surface treatment method is further characterized in that the moving body has a rolling element which runs along the valley portion of the roof. In yet a further embodiment, the roof has an slope portion which is provided at a boundary portion between the mountain portion and the valley portion and which is inclined with respect to a projecting end surface of the mountain portion and a bottom surface of the valley portion respectively, the surface processing method is further characterized in that a nozzle axis of at least one of the first spray device and the second spray device is arranged to be directed toward the slope portion. 
     In yet a further development, the surface processing method is further characterized in that at least one of said first spray device and said second spray device is arranged so that the nozzle axis is changed between a 1st state in which the nozzle axis is directed to the slope portion adjacent to one side of the valley portion and a 2nd state in which the nozzle axis is directed to the slope portion adjacent to the other side of the valley portion, and spray is respectively performed at the time of the 1st state and the 2nd state in a state in which the moving body is being moved. 
     In yet a further development, the surface processing method is further characterized in that at least one of the first spray device and the second spray device performs a spray while the moving body moves along a first direction, and at the end portion of the first movement direction the moving body is moved in a second direction different from the first movement direction. 
     In another embodiment, the surface processing method is further characterized in that, providing a rail portion for moving the moving body in contact with and along the surface, and in a direction different from the moving direction during a time when at least one of the first spray device and the second spray device sprays, and the moving body is moved in a direction along the rail portion in a state in which a distance between the moving body and the rail portion is altered to a direction in which the moving body apart from the surface. 
     In yet another embodiment, the surface processing method is further characterized in that, the second spray device sprays the second material multiple times onto the area where the first material is sprayed by the first spray device. 
     In a different embodiment, the surface processing method is further characterized in that a point of contact with the moving body on the surface, a directed point of the nozzle axis of the first spray device, and a directed point of the nozzle axis of the second spray device are separately arranged to each other and sequentially arranged in a direction different from a direction of movement of the moving body during a time when at least one of the first spray device and the second spray device performs spraying. 
     In yet another embodiment, the surface processing method is further characterized in that the moving body contacts the surface at only one direction side in a direction orthogonal to a moving direction of the moving body at the time when the spray is performed toward an area to which the first spray device and the second spray device spray the first material and the second material onto the surface, and spraying of the first material and the second material is performed while moving the moving body sequentially to the one direction side. 
     As described above, according to the present invention, it is possible to provide a surface processing apparatus and a surface processing method which improve the quality of the surface treatment using a material having foaming property. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  An external perspective view of a surface processing apparatus according to the first embodiment of the present invention; 
         FIG. 2  A view taken along arrow line II-II of  FIG. 1 ; 
         FIG. 3  A view taken along arrow line III-III of  FIG. 1 ; 
         FIG. 4  Diagrams schematically showing a surface processing method onto a folded plate roof by a surface processing apparatus according to the first embodiment; 
         FIG. 5  A diagram schematically showing a path of a spray part of a surface processing apparatus according to the first embodiment; 
         FIG. 6  An external perspective view of a surface processing apparatus according to the second embodiment of the present invention; 
         FIG. 7  A view taken along arrow line VII-VII of  FIG. 6 ; 
         FIG. 8  A view taken along arrow line VIII-VIII of  FIG. 6 ; 
         FIG. 9  A view showing a state in which a carriage is raised by a jack in the surface processing apparatus of the second embodiment. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     A First Embodiment 
     Hereinafter, a surface processing apparatus and a surface processing method according to a first embodiment of the present invention will be described. 
     The surface processing method and the surface processing method according to the first embodiment are for forming a heat insulating foamed layer (foam layer) made of a resin material having foaming property and a reinforcing waterproof layer (coating layer) to be overcoated on the heat insulating layer and having waterproofness on a metal folded-plate roof of a large building such as a factory, a warehouse, a commercial facility, etc. and the roof formed by bending a metal plate such as a steel plate at a predetermined pitch. 
       FIG. 1  is an external perspective view of the surface processing apparatus according to the first embodiment. 
       FIG. 2  is a view taken along arrow line II-II of  FIG. 1 . 
       FIG. 3  is a view taken along arrow line III-III of  FIG. 1 . 
     The surface processing apparatus  1  according to the first embodiment includes a carriage  10 , a nozzle stay  20 , a foaming agent spray device  30 , a coating agent spray device  40 , a nozzle driving device  50 , a duct  60 , and a cover frame  70  etc. 
     A roof  100  of a process object is a folded-plate roof constituted by sequentially arranging a top surface  110 , a 1st slope  120 , a bottom surface  130 , and a 2nd slope  140  which extend along a direction (vertical direction) in which the inclination is maximized. 
     In the following description, a convex portion formed by a top surface  110  and an upper half portion of the 1st slope  120  and the 2nd slope  140  adjacent thereto will be referred to as a mountain portion, and, a bottom surface  130  and a lower half portion of a 1st slope  120  and the 2nd slope  140  adjacent thereto will be referred to as a valley portion. 
     The carriage  10  is a base portion of the surface processing apparatus  1  and has a function of self-propelling on the roof  100  along the longitudinal direction of the mountain portion and the valley portion of the folded-plate roof. 
     As shown in  FIG. 1  and  FIG. 3 , the main body of the carriage  10  has a rectangular board-like shape as viewed from the normal direction of the main plane of the roof  100 . The carriage  10  has wheels  11  and a driving motor unit  12 . 
     Each wheel  11  is a rolling element which is attached to a stay projecting downward from the carriage  10  and which rolls along the surface of the roof  100 . 
     The wheels  11  are provided at 4 corners of the carriage  10 , and their running directions are arranged along the longitudinal direction of the bottom surface  130  of the roof  100 . 
     A pair of wheels  11  is provided in the vicinity of theist slope  120  side end of the bottom surface  130  of the roof  100  valley, and the other pair of wheels  11  is provided in the vicinity of the 2nd slope  140  side end of the bottom surface  130  at adjacent another valley. 
     With this configuration, the carriage  10  can travel being guided by the valley of the folded-plate roof as a rail. 
     The driving motor unit  12  is an actuator that transmits a driving force to the wheels  11 . The drive motor unit  12  has an automatic stop function which automatically stops when the carriage  10  reaches an end of the roof  100 . 
     The foaming agent spray device  30  and the coating agent spray device  40  have a function to stop the spray in response to an automatic stop of the driving motor unit  12 . 
     The nozzle stay  20  is a cantilevered member which protrudes from the body of the carriage  10  and overhangs over the roof  100 . 
     The nozzle stay  20  extends from the carriage  10  in a direction substantially orthogonal to the longitudinal direction of the mountain portion and the valley portion of the folded-plate roof (the travelling direction of the carriage  10  at the time of coating). 
     The nozzle stay  20  is a member to which the foaming agent spray device  30  and the coating agent spray device  40  are attached. 
     The nozzle stay  20  is supported on the carriage  10  so as to be relatively displaceable along the longitudinal direction thereof. 
     The foaming agent spray device  30  sprays a foaming resin material (first material) on a surface of a roof  100  as a spray Sf to form a heat-insulating foam layer. 
     As the material (foaming agent and foam agent), for example, a resin foaming agent such as a polyurethane resin, a phenol resin, or a mixture thereof can be used. 
     For example, a resin mainly containing a polyol, a polypropylene glycol (PPG) may be used as a main agent. 
     It is also possible to use, as a main agent, a phenolic resin or a phenolic resin containing a novolac thermoplastic resin as a main component, or a mixture thereof. 
     A crosslinking agent such as isocyanate is mixed with these main agents at a mixing ratio of about 1:1 to foam them, and a filler, an additive etc. is added to obtain a material for spray. 
     The isocyanate is a kind of non-fluorocarbon foaming agent, and has a function of generating carbon dioxide gas by reaction with water and foaming the material. 
     As soon as this material has been sprayed onto the surface of the roof  100 , it begins to foam and an insulating foam layer is formed immediately, for example, on the order of several tens of seconds. 
     The coating agent spray device  40  sprays a resin material (a second material) constituting a reinforcing waterproof layer as a spray Sc on an area where an insulating foam layer is formed on the surface of a roof  100 . 
     As the main agent of this material (coating agent), for example, a polyurethane resin containing polyol or polypropylene glycol (PPG) as a main component can be used. 
     A crosslinking agent such as isocyanate is mixed with the main agent at a mixing ratio of about 1:1, and a filler, an additive etc. is added thereto to obtain a coating agent. 
     The foaming agent spray device  30  and the coating agent spray device  40  are attached to the nozzle stay  20  in a posture in which the nozzle faces the roof  100 . 
     The foaming agent spray device  30  and the coating agent spray device  40  are sequentially installed from the carriage  10  side. 
     A distance between the foaming agent spray device  30  and the coating agent spray device  40  at a lateral direction of the roof (a direction orthogonal to a longitudinal direction of the mountain portion and the valley portion) is set substantially equal to an interval of each top surface  110  of adjacent mountain portions on the roof  100 . 
     Details of arrangement of the nozzle axis of each of the spray devices, such as an orientation of direction and the transition thereof, will be described in detail later. 
     The foaming agent spray device  30  and the coating agent spray device  40  have a function of switching between a 1st state in which the nozzle axis of the foaming agent spray device  30  and the coating agent spray device  40  is directed toward the 1st slope  120  of the roof  100  and a 2nd state in which the nozzle axial is directed toward the 2nd slope  140  by swinging (oscillating) the nozzle portion. 
     The nozzle drive device  50  moves the nozzle stay  20  relative to the carriage  10  along the longitudinal direction thereof, and adjusts the positions of the respective spray devices so that the nozzle axial center is at an appropriate position when the foaming agent spray device  30  and the coating agent spray device  40  switch between the 1st state and the 2nd state. 
     The nozzle driving device  50  drives the nozzle stay  20  in a direction of sending the stay  20  forward relative to the carriage  10  linking with a change of the foaming agent spray device  30  and the coating agent spray device  40  from the 1st state to the 2nd state, and drives the nozzle stay  20  in a direction of drawing back from a carriage  10  linking with a change from the 2nd state to the 1st state. 
     With such a function, the foaming agent spray device  30  and the coating agent spray device  40  can perform a behavior as shown in  FIG. 4 . 
     The duct  60  is a conduit for supplying the foaming agent and the coating agent which are pressurized and delivered from a material supplying means (not shown), which is provided on the ground for example, to the foaming agent spray device  30  and the coating agent spray device  40 . 
     For example, the duct  60  is formed in a bendable flexible tubular shape and is interposed in an area opposite to the nozzle stay  20  protruding side with regard to the main body portion  10 . 
     The cover frame  70  is a structure to which a cover member (not shown) is attached, and the member covers the foaming agent spray device  30  and the coating agent spray device  40 . 
     The cover frame  70  is formed into a frame shape in which a plane shape seen from a running direction of the wheel  11  of a carriage  10  and viewed from a direction orthogonal thereto is a rectangular shape, respectively. 
     The cover frame  70  is, when viewed from the travelling direction of the carriage  10 , arranged so as to protrude from the carriage  10  to each spray device side in a cantilever state. 
     Hereinafter, a surface processing method using the surface processing apparatus of the first embodiment will be described. 
       FIG. 4  is a diagram schematically showing a surface processing method onto a folded-plate roof by using the surface processing apparatus of the first embodiment. 
       FIG. 5  is a diagram schematically showing a path of a spray point in the surface processing apparatus according to the first embodiment. 
     In  FIG. 4 ,  FIGS. 4 ( a )  to  4  ( d ) show a spray state of each spray device in time series. Each nozzle part of the foaming agent spray device  30  and the coating agent spray device  40  is provided so as to be changeable between the 1st state and 2nd state, in the 1st state a spray Sf comprising a foaming agent and a spray Sc comprising a coating agent are directed to a 2nd slope  140  on the opposite side of the carriage  10  side with regard to a top surface  110 , and in the 2nd state the sprays are directed to a 1st slope  120  on the carriage  10  side with regard to a top surface  110 . 
     For example, the nozzle portion of the foaming agent spray device  30  and the nozzle portion  40  of the coating agent spray device can rotate (swing) relative to the nozzle stay  20  around the rotation shaft arranged along the travelling direction of the carriage  10 . 
     Further, the nozzle driving device  50  has a function of adjusting the axial center direction of each nozzle to be appropriately directed to a predetermined slope in accordance with the rotation of each nozzle by moving the nozzle stay  20  along the longitudinal direction. 
     First, as shown in  FIG. 4 ( a ) , a nozzle axis of the foaming agent spray device  30  is directed toward the 1st slope  120 , and a nozzle axis of the coating agent spray device  40  is directed toward a 1st slope  120  of another adjacent valley portion. 
     In this state, spray Sf is sprayed from foaming agent spray device  30 , and spray Sc is sprayed from coating agent spray device  40 , whereby the foaming agent and the coating agent can be respectively sprayed onto the 1st slope  120  to which each nozzle is directed and adjacent top surface  110  and bottom surface  130 . 
     In this state, as shown in  FIG. 5 , the carriage  10  is travelled in one direction of the roof  100  (e.g., in an upward direction in  FIG. 5 ). 
     Next, when the carriage  10  reaches an end of the roof  100 , the carriage  10  is stopped, and the spray of the foaming agent spray device  30  and the coating agent spray device  40  is stopped. Then in this state, the nozzle direction of the foaming agent spray device  30  and the coating agent spray device  40  is changed, a nozzle stay  20  is fed out by the nozzle driving device  50 , and the nozzle axial center is directed to the 2nd slope  140 . 
     In this state, as shown in  FIG. 4 ( b ) , spray Sf is sprayed from the foaming agent spray device  30 , and spray Sc is sprayed from the coating agent spray device  40 , whereby the foaming agent and the coating agent can be respectively sprayed onto the 2nd slope  120  and adjacent top surface  110  and bottom surface  130 . 
     In this state, as shown in  FIG. 5 , the carriage  10  is travelled to another direction of the roof  100  (e.g., in the downward direction in  FIG. 5 ). 
     Through the processing described above, a foaming agent can be sprayed on the 1st slope  120  and the 2nd slope  140  which sandwiches the valley portion below the foaming agent spray device  30 , and on the top surface  110  and the bottom surface  130  adjacent thereto. 
     The foaming agent foams shortly after spray (e.g., tens of seconds) and cures to form an insulating foam layer F. 
     Further, a coating agent can be sprayed on the 1st slope  120  and the 2nd slope  140  which sandwiches the valley portion below the coating agent spray device  40 , and on the top surface  110  and the bottom surface  130  adjacent thereto. 
     The coating agent may be sprayed after the foaming agent is sprayed and before the foaming agent foams, but is preferably sprayed after the foaming agent has foamed. Since the coating agent is sprayed onto the surface of the already formed insulating foam layer, it is preferable that the coating agent is sprayed multiple times, accordingly, as described below, spraying of the coating agent only is to be performed. 
     In a state in  FIG. 4 ( b ) , a carriage  10  is travelled while spraying is performed, and when it reaches an end of a roof  100 , a carriage  10  is stopped, and a foaming agent spray device  30  and a coating agent spray device  40  are stopped. Then in this state, a nozzle direction of a foaming agent spray device  30  and a coating agent spray device  40  is changed, and the nozzle stay  20  is drawn in by a nozzle driving device  50 , and a nozzle axial center is directed toward the 1st slope  120 . 
     In this state, as shown in  FIG. 4 ( c ) , only the coating agent spray device  40  sprays, and the carriage  10  is travelled upward in  FIG. 5 . 
     After that, after the carriage  10  reaches the upper end of the roof  100  in  FIG. 5 , the carriage  10  is stopped and the spray of the coating agent spray device  40  is stopped. Then in this state, a nozzle direction of a foaming agent spray device  30  and a coating agent spray device  40  is changed, a nozzle stay  20  is fed out by a nozzle driving device  50 , and a nozzle axial center is directed to the 2nd slope  140 . 
     In this state, as shown in  FIG. 4 ( d ) , only the coating agent spray device  40  performs spraying, and the carriage  10  is travelled downward in  FIG. 5 . 
     By repeating the spraying using only the coating agent spray device  40 , it is possible to superpose the coating agent spraying a predetermined number of times and to obtain a desired thickness of the reinforcing waterproof layer (coating layer) C. 
     After the coating agent is sprayed to overcoat by a predetermined number of times (e.g., about 2 to 4 times) as described above, the surface processing apparatus  1  is moved, by workers or external equipment such as a crane, as though the carriage  10  straddles beyond one peak of a mountain portion of the roof  100 , toward the carriage  10  side (right-hand side in  FIG. 5  etc.) seen from the foaming agent spray device  30  side and coating agent spray device  40  side. 
     Thereafter, by sequentially repeating the processes of  FIG. 4 ( a )  and thereafter, the heat-insulating foam layer and the reinforcing waterproof layer can be quickly applied on the surface of the folded-plate roof  100  with good quality. 
     According to the first embodiment described above, the following effects can be obtained. 
     (1) By spraying the foaming agent and the coating agent while moving the carriage  10  along the surface of the roof  100 , it is possible to suppress variation (unevenness) in the coating thickness of the foaming agent and the coating agent and to uniformize the thickness of the heat-insulating foam layer and the reinforcing waterproof layer. 
     Further, by providing the foaming agent spray device  30  and the coating agent spray device  40  on the common carriage  10 , it is easy to apply the coating agent within a short time after the application of the foaming agent, and the quality of the surface treatment can be improved. 
     (2) By arranging the travelling direction of the carriage  10  at the time of spraying the foaming agent and the coating agent along the vertical direction (maximum inclination direction) of the roof  100 , it is possible to prevent the formation of unevenness extending in a direction orthogonal to the vertical direction and to secure the drainage property of rainwater etc. 
     (3) By spraying the foaming agent and the coating agent while the carriage  10  travels along the longitudinal direction of the mountain portion and the valley portion of the roof  100 , the above-described effect can be reliably obtained. 
     (4) By utilizing the valley portion of the folded-plate roof as a rail for guiding the wheels  11  of the carriage  10 , the carriage  10  can travel with sufficient accuracy by a simple configuration. 
     (5) By spraying the foaming agent and the coating agent toward the 1st slope portion  120  and the 2nd slope portion  140  where it is difficult to secure a sufficient coating thickness, it is possible to secure a sufficient coating thickness in the 1st slope portion  120  and the 2nd slope portion  140 , and it is possible to prevent the coating thickness of the top surface  110  from becoming excessively large like a mushroom shape. 
     (6) It is possible to simplify the configuration of the apparatus by performing a spray onto the 1st slope  120  and the 2nd slope  140  which are inclined in different directions by a common spray device while changing the states of the foaming agent spray device  30  and the coating agent spray device  40 . 
     In particular, it is possible to simplify the configuration of a compressor etc. for supplying the coating under pressure, and it is possible to reduce the number of equipment to be prepared on the ground when coating is applied to a roof. 
     (7) After the foaming agent and the coating agent are sprayed along the mountain portion and the valley portion of the folded-plate roof while the carriage  10  travels, the carriage  10  is fed to direction straddling beyond a mountain portion and a valley portion of the roof  100 , and the same process is repeated, whereby a wide range of treatment can be performed easily and with high quality. 
     (8) By performing a process of spraying only a coating agent without spraying a foaming agent, it is possible to apply the reinforcing waterproof layer onto the surface of the heat-insulating foam layer until a sufficient coating thickness is obtained, and thus it is possible to further enhance the treatment quality. 
     (9) In the same travel stroke of the carriage  10 , the foaming agent spray device  30  and the coating agent spray device  40  spray onto different peaks or valleys, whereby the coating agent can be sprayed at an appropriate time interval after the spraying of the foaming agent. 
     (10) The nozzle stay  20  supporting each of the spray devices is cantilevered from the carriage  10 , and the carriage  10  is sequentially fed in a direction away from the sprayed area. Accordingly, it is possible to prevent the wheels  11  of the carriage  10  from running on the surface of the area where the heat-insulating foam layer has been formed, and to protect the heat-insulating foam layer thus further improving the treatment quality. 
     A Second Embodiment 
     Next, a second embodiment of the surface processing apparatus to which the present invention is applied will be described. 
     In each of the embodiments described below, portions common to the previous embodiment will be denoted by the same reference numerals, and description thereof will be omitted, and mainly differences will be described. 
       FIG. 6  is an external perspective view of the surface processing apparatus according to the 2nd embodiment. 
       FIG. 7  is a view taken along arrow line VII-VII of  FIG. 6 ; 
       FIG. 8  is a view taken along arrow line VIII-VIII of  FIG. 6 ; 
     As shown in  FIGS. 6 to 8 , the surface processing apparatus  1 A according to the second embodiment of the present invention is provided with a lateral travelling wheels  80 , a jack  90 , and a rail R added to the surface processing apparatus  1  of the first embodiment. 
     In  FIGS. 6 to 9 , the duct  60  and the cover frame  70  are omitted. 
     In addition, in the second embodiment, a tension wire  22  is provided between the bracket  21  protruding upward from the base of the nozzle stay  20  and the nozzle stay  20  to reinforce the support strength of the nozzle stay  20 . 
     The lateral feeding wheel  80 , the jack  90 , and the rail R are used when the surface processing apparatus  1 A is moved in the direction to which the apparatus  1 A straddles the mountain portions of the roof  100 . 
     The rail R is a member which is detachably mounted on the upper portion of the roof  100  and guides the lateral movement of the surface processing apparatus  1 A. 
     The rail R is formed in a rectangular frame shape by, for example, joining a pair of parallelly arranged guide members at both ends. 
     Since the rail R itself is relatively light in weight, it is possible for an operator to manually set the rail R straddling over multiple top surfaces  110  of the roof. 
     The rail R is arranged so that the guide member is orthogonal to the extending direction of the mountain portions and the valley portions of the folded-plate roof. 
     The lateral feeding wheels  80  are rolling elements which run on the guide member of the rail R during lateral feeding of the surface treatment device  1 A. 
     Lateral feeding wheels  80  are provided at the lower end of the bracket projecting below the body of the carriage  10 . 
     The lateral feeding wheels  80  are mounted to the carriage  10  so as to be relatively displaceable in the vertical direction. 
     The jack  90  is a driving device (moving body separating portion) which displaces the lateral feeding wheels  80  in the vertical direction relative to the carriage  10 . 
     The jack  90  has a function of raising the carriage  10  relative to the rail R laid at the lower side of the feeding wheels  80  and projecting the feeding wheels  80  downward from the carriage  10 . 
     For example, the jack  90  may be configured to be raised and lowered by an electric, hydraulic, or other actuator. 
       FIG. 9  is a view showing a state in which the carriage is lifted by the jack in the surface processing apparatus according to the second embodiment. 
     In the state shown in  FIG. 9 , the wheels  11  of the carriage  10  have risen to a state higher than the top surface  110  of the roof  100 , and the carriage  10  can move along the rail R to a direction straddling across a mountain portion and a valley portion of the roof  100 . After the movement of the carriage  10  in the lateral direction is completed, by the jack  90 , the lateral feeding wheels  80  has been raised relative to the carriage  10  (the carriage  10  is lowered relative to the roof  100 ), until the wheels  11  contact the bottom surface  130  of the roof  100  and the lateral feeding wheels  80  to apart from the rail R. Thereafter, the rail R can be moved, for example, manually by an operator. 
     According to the second embodiment described above, in addition to the effects similar to those of the first embodiment described earlier, it is possible to perform easily and in labor saving manner the movement to the direction straddling across a mountain portion and a valley portion of the roof  100  with a light and simple configuration. 
     A Third Embodiment 
     Next, a third embodiment of the surface processing apparatus to which the present invention is applied will be described. 
     In the surface processing apparatus of the third embodiment, which is not illustrated, a foaming agent spray device  30  and a coating agent spray device  40  are arranged along the travelling direction of the carriage  10  (the longitudinal direction of the mountain portion and the valley portion of the roof  100 ). 
     In the surface processing apparatus  1  according to the third embodiment, at first, the carriage  10  travels one stroke along the mountain portion and the valley portion in a state in which a foaming agent is sprayed from the foaming agent spray device  30 . 
     Then, the carriage  10  travels one stroke or plural strokes along the same tracks in a state in which a coating agent is sprayed from the coating agent spray device  40 . By this procedure, a heat-insulating foam layer and a reinforcing waterproof layer is sequentially performed. 
     According to the third embodiment described above, the configuration of the surface processing apparatus is made compact, and portability of the apparatus can be improved. 
     A Fourth Embodiment 
     Next, a fourth embodiment of the surface processing apparatus to which the present invention is applied will be described. 
     In the surface processing apparatus of a fourth embodiment that is not illustrated, in place of the foaming agent spray device  30  and the coating agent spray device  40  having the variable direction nozzle in the first embodiment, there are provided a foaming agent spray device  30  and a coating agent spray device  40  having a plurality of nozzles respectively directing to the 1st slope  120  and the 2nd slope  140  of the roof  100 . According to the fourth embodiment described above, although the structure of the device for supplying the material to be sprayed becomes complicated, it is possible to reduce the movable portions of the apparatus and to improve durability and reliability. 
     (Modification) 
     The present invention is not limited to the embodiments described above, and various modifications and changes may be made without departing from the scope of the present invention. 
     (1) The configuration of the surface processing apparatus and the surface processing method is not limited to the above-described embodiments, and can be changed appropriately. 
     (2) In each of the embodiments, a set of the foaming agent spray device and the coating agent spray device is mounted on one surface treatment device, but a plurality of foaming agent spray devices and a plurality of coating agent spray devices may be provided in one surface treatment device. 
     It is also possible to provide a spray device which sprays other materials which further covers the reinforcing waterproof layer comprising a coating agent. 
     (3) The structure of the moving device for moving the surface processing apparatus in the direction straddling across a mountain portion and a valley portion is not limited to the configuration of the second embodiment, and can be changed as appropriate. 
     (4) In each of the embodiments, the object to be subjected to the surface treatment is a folded-plate roof as an example, however, the present invention is not limited thereto, and may be applied to surface treatment of other objects such as a slate roof other than a folded-plate roof and a wall surface of a building. 
     (5) In each of the embodiments, the roof  100  of the processed object has a structure in which the top surface  110 , the 1st slope  120 , the bottom surface  130 , and the 2nd slope  140  extend along a direction in which the inclination is maximum, however, they are not necessarily extending along a maximum inclination. In this case, the surface processing apparatus  1  may be moved along any inclination direction of the roof and need not be moved along a direction in which the inclination is maximum. 
     
       
         
           
               
             
               
                   
               
               
                 EXPLANATION OF REFERENCE NUMERALS 
               
               
                 [Explanation of letters or numerals] 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 1, 1A 
                 surface processing apparatus 
                 10 
                 carriage 
               
               
                 11 
                 wheel 
                 12 
                 driving motor unit 
               
               
                 20 
                 nozzle stay 
                 21 
                 bracket 
               
               
                 22 
                 tension wire 
                 30 
                 foaming agent spray device 
               
               
                 40 
                 coating agent spray device 
                 50 
                 nozzle driving device 
               
               
                 60 
                 duct 
                 70 
                 cover frame 
               
               
                 80 
                 lateral feeding wheel 
                 90 
                 jack 
               
               
                 R 
                 rail 
               
               
                 100  
                 roof 
                 110  
                 top surface 
               
               
                 120  
                 1st slope 
                 130  
                 bottom surface 
               
               
                 140  
                 2nd slope 
               
               
                 Sf 
                 foaming agent spray 
                 Sc 
                 coating agent spray 
               
               
                 F 
                 insulation foam layer 
                 C 
                 reinforced waterproof layer