Removable ground anchor body using spring

A removable ground anchor body uses a spring and includes: a waterproof cap formed with an upward screw groove at an inner lower end; a housing that is coupled to a lower end of the waterproof cap and is formed with an upward locking protrusion therein; a body that is formed with a rotating main spring coupled to a screw groove of the waterproof cap at the top and is formed with a stopper on an outer peripheral edge to be locked to the locking protrusion of the housing; a stopper presser that is installed between the waterproof cap and the body and brings the lower end into close contact with the stopper upper surface of the body; a strand wire wedge; a wedge hold; and a head coupler.

CROSS REFERENCES TO RELATED APPLICATIONS

This application claims priority to Korean Patent Application No. 10-2015-0179334, filed on 15 Dec. 2015, in the Korean Intellectual Property Office, the contents of which is hereby incorporated by reference in its entirety.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a removable ground anchor body using a spring, and more particularly, to a removable ground anchor body using a spring that is coupled to an end portion of a fixing portion of a pre-stressed concrete (PC) strand wire such that a perfect coupling state is kept even by movement or external impact in the field and at the same time a tensile material such as a PC strand wire can be easily separated and removed even by man power.

Description of the Related Art

In general, a slope reinforcement structure coupled with a PC strand wire is to form holes in the ground by drilling, insert a tensile material with excellent tensile strength into the drilled holes with an internal fixing agent and inner member, thereafter, firmly fix it by injecting with a grouting material such as concrete, and thereafter, apply a load to a free end of the tensile material, fix it with an external fixing material and ensure a strong fixation force to safely support structures such as earth retaining walls. Such a slope reinforcement structure is widely used in a soil retailing construction for preventing the collapse of the surrounding ground at the time of excavation for underground structures of the building construction and civil engineering, a construction for suppressing the sediment loss of the soft ground incision surface.

As the tensile material used in the slope reinforcement structure, a tensile material made by twisting a plurality of strands of deformed bars or steel wires is used. Since the tensile material has outstanding strength, if it is left in the ground it becomes a ground obstacle, and there is a risk of causing a problem such as the ground compensations in future development of adjacent land.

To solve this problem, a removable internal fixing material for ground anchor for easily removing the tensile material embedded in the ground after the construction has been known.

Such a conventional anchoring body has a configuration in which an inclined surface is formed inside a cylindrical body, a wedge divided into approximately three pieces is provided on the inner surface of the inclined surface, the tensile material seats on the central portion of the wedge, and an elastic spring for pressing the wedge forward is provided at the rear end of the wedge to press the wedge to prevent detachment and separation of the tensile material.

However, according to the structure of the conventional anchoring body, in order to remove the tensile material, the tensile material is pressed to retract the wedge provided on the inside of the cylindrical body, and at the same time, the tensile material can be removed in the state of expanding the central portion. However, even when retracting the wedge, the expansion is not correctly performed, and even when the wedge is moved back to perform the expansion, since the spring provided in its rear end continuously presses the wedge, there is still a problem in that a burden may occur upon removal of the tensile material and the separation may not be performed correctly.

In the conventional removable internal fixing agent, there was a problem in that it was not possible to easily remove the tensile material in the future, when an impact is applied to the internal fixing material of the PC strand wire in the course of transporting the PC strand wire manufactured in the factory to a construction site or in the course of handling at the time of construction work.

Furthermore, since it is almost impossible to reassemble the anchor body in which the coupled state is separated due to the external impact in the field, a major obstacle was caused in the progression of construction.

There is a technique of Korean Patent Registration No. 10-0963565 in which these problems are improved, although such a technique presses the wedge by elasticity of the upper spring to continually maintain the bound state with the tensile material and allows the re-coupling, while suppressing the wedge from being separated due to the external impact during transportation or handling process, there were drawbacks in which it was not possible to basically prevent the separation of the tensile material due to the spring contraction caused by external impact energy from the outside, and it was not possible to remove the tensile material by the man power after the installation of the slope.

SUMMARY OF THE INVENTION

An aspect of the present invention is directed to provide a removable ground anchor body using a spring that can maximize and properly cope with the supporting force depending on to the soil behavior, and can easily separate a tensile material such as a PC strand wire coupled to the anchor structure by the manual force.

Another aspect of the present invention is directed to provide a removable ground anchor body using a spring which allows a safe and perfect assembly and coupling state even in case of the movement of the anchor body and the external impact in the field, prevents the erroneous operation, and improves the reliability of the product.

Still another aspect of the present invention is directed to provide a removable ground anchor body using a spring that allows easier re to coupling by rotation even when the coupling state of the anchor body is separated.

To achieve the above object, according to an aspect of the present invention, there is provided a removable ground anchor body using a spring that includes a housing that is coupled to a lower end of a waterproof cap and is formed with a locking protrusion therein; a body that is formed with a rotating main spring coupled to a screw groove of the waterproof cap at the top and is formed with a stopper on an outer peripheral edge to be locked to the locking protrusion of the housing; a stopper presser that is installed between the waterproof cap and the body and brings the lower end into close contact with the stopper upper surface of the body; a strand wire wedge that is coupled to the lower portion of the body and is made up of a plurality of pieces; a wedge hold that is formed with a tapered hole for guiding the strand wire wedge and has a cushioning auxiliary spring flexibly installed at the bottom; and a head coupler that is coupled to the lower portion of the housing to support the wedge hold and is formed with an entry hole in the length direction, wherein the strand wire edge can be controlled, while vertically mutually complementing by the rotating main spring and the cushioning auxiliary spring, and the stable coupling state position of the tensile material can be maintained in the assembled state by the stopper.

Therefore, according to the removable ground anchor body using the spring of the present invention, since the stopper of the body is controlled to be located between the locking protrusion and the stopper presser, and the elasticity of each of the rotating main spring and the buffering auxiliary spring acts on the upper and lower portions of the strand wire wedge, it is possible to maintain a proper elasticity even in the case of an external impact, and the elasticity strength of the rotating main spring and the buffering auxiliary spring are offset at the upper and lower portions. Thus, the strand wire wedge can maintain a continually stable and perfect assembled state even in the case of in the front end of the tensile material.

In addition, when removing the tensile material, since the stopper of the body is already in a removed state, the strand wire wedge can completely separate and remove the tensile material away from the tapered hole, and at the same time, when the tensile material rotates, the elasticity of the buffering auxiliary spring acts on the waterproof cap side to induce the strand wire wedge to smoothly escape from the tapered hole of the wedge hold. Thus, it is possible to conveniently separate and remove the tensile material only by the man power using a basic device.

In particular, since the wedge holder and the head coupler are separately installed, there is an effect capable of preventing the tensile material of the strand wire or the like from coming off due to any impact, maximizing the role of the spring and facilitating the removal of the tensile material.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Wherever possible, the same reference numerals will be used to refer to the same elements throughout the specification, and a duplicated description thereof will be omitted. It will be understood that although the terms “first”, “second”, etc. are used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element.

As illustrated inFIGS. 1 to 6, a removable ground anchor body100using a spring that includes a waterproof cap110formed with an upward screw groove111from an inner lower end; a housing120that is coupled to a lower end of the waterproof cap110and is formed with a locking protrusion121corresponding to the waterproof cap110therein; a body130that is formed with a rotating main spring136coupled to a screw groove111of the waterproof cap110at the top and is formed with a stopper131on an outer peripheral edge to be locked to the locking protrusion121of the housing120; a stopper presser140that is installed between the waterproof cap110and the body130and brings the lower end into close contact with the stopper131upper surface of the body130; a strand wire wedge150that is coupled to the lower portion of the body130and is made up of a plurality of pieces; a wedge hold160that forms a tapered hole161for guiding the strand wire wedge150and has a cushioning auxiliary spring163flexibly installed at the bottom; and a head coupler170that is coupled to the lower portion of the housing120to support the wedge hold160and is formed with an entry hole171in the length direction.

The watertight cap110is formed with the screw groove111inside upward from the lower end, and is preferably formed with a bolt head-shaped protrusion at the top to facilitate the fastening operation of the housing120.

The housing120is formed in a cylindrical shape that vertically penetrates, is provided with a packing or the like at the top, can fasten the watertight cap110by a conventional coupling means such as screw coupling or the like, is formed with a locking protrusion121in the upward direction on the inner peripheral edge, and the upper side of the stopper131of the body130is locked by the locking protrusion121.

The screw protrusion132protrudes upward at the center of the upper surface of the body130, and a rotating main spring136coupled to the screw groove111of the waterproof cap110is integrated to the screw protrusion132, by being coupled upward. Thus, with the rotation or the reverse rotation of the body130, the rotating main spring136also rotates and reversely rotates to rise or fall along the screw groove111, and the body130is also formed to rise and fall.

In addition, a flange-shaped stopper131is formed on the outer peripheral edge of the body130to be locked to the top of the locking protrusion121of the housing120.

In addition, a coupling protrusion133protrudes downward from in the bottom center of the body130, and an annular coupling groove134is formed on the outer peripheral edge of the coupling protrusion133so that the strand wire wedge150can be coupled thereto, and a key groove135is preferably formed upward on the lower end surface of the coupling protrusion133so that the front end of the tensile material180can be fitted and key-coupled thereto.

The stopper presser140is formed in a cylindrical shape and is inserted into the housing120so as to be positioned between the lower end of the watertight cap110and the stopper131of the body130. Thus, the stopper131can be ideally locked on the locking protrusion121of the housing120to suppress the movement.

Here, the stopper presser140may also be used by being integrally formed with the watertight cap110, it is preferably used in a separated state in view of the molding ratio or the like.

The strand wire wedge150is fitted and connected to the coupling groove134of the body130by forming the upward locking protrusion151on the upper side, and is generally formed in three pieces by trisection.

The wedge hold160is formed with a tapered hole161to be able to fix or release the tensile material180by guiding the strand wire wedge150, and is formed with a locking jaw162on the lower peripheral edge.

In particular, since the wedge hold160is provided with a buffering auxiliary spring163corresponding to the locking jaw162to flexibly install the wedge hold160upward, the strand wire wedge150can be preferably fitted to the tapered hole150to stably maintain the fixed state of the tensile material180.

The head coupler170is preferably coupled to the bottom of the housing120to support the wedge hold160, is formed with an entry hole171in a lengthwise direction so that the tensile material180can enter and exit from the outside, and is formed with a support jaw172inside to support the lower end of the wedge hold160and the lower end of the buffering auxiliary spring163such that the flexibly installed wedge hold160can be smoothly operated.

Here, the head coupler170is coupled to the lower side of the housing120, is provided with a packing or the like, and is coupled with normal coupling means such as screw coupling.

The operation of the present invention will be described below.

First, as illustrated inFIG. 3, when the assembly of the anchor body100is completed, the stopper131of the body130is fit between the locking protrusion121of the housing120and the stopper presser140, and the body130maintains a fixed state, the flexibly installed wedge hold160to face upward press-fits the strand wire wedge150to the tapered hole161, thereby stably and consistently maintaining the state assembled to the tensile material180.

Thus, even when an external impact occurs during movement or installation, it is possible to stably and consistently maintaining the assembled state.

Nevertheless, even when the stopper131of the body130is damaged due to the strong external impact energy, the rotating main spring136presses the strand wire wedge150to the tapered hole161of the wedge hold160, and at the same time, the buffering auxiliary spring163presses the wedge hold160toward the strand wire wedge150. Thus, the strand wire wedge150can maintain the assembled state, by continuing the state of stably fixing the tensile material180such as a PC strand wire. Since each of the elasticity of the rotating main spring136and the buffering auxiliary spring163acts on the upper and lower portions of the strand wire wedge150, the elasticity strength of the rotating main spring136and the buffering auxiliary spring163is mutually offset in the upper and lower portions even in the case of the external impact, and thus, the strand wire wedge150can maintain a stable and perfect assembled state in the front end of the tensile material180.

As illustrated inFIG. 4, after the anchor body100assembled as described above is inserted into the drilled holes of the slope, the grouting is performed, and thereafter, when pulling the tension material180, the strand wire wedge150is strongly pulled by tensile strength of several tons, and the strand wire wedge150further bites and presses the tensile material180, while moving to the tapered hole161of the wedge hold160, and thus, a rigid and strong coupling state is maintained, the tensile material180is smoothly and safely pulled to induce the stabilization of the structure or the like.

At this time, since the tensile material180is pulled by the powerful force of several tons, while the body130coupled to the strand wire wedge150is also pulled, the stopper131of the body130is crushed and removed by being locked to coupling protrusion121of the housing120.

As illustrated inFIG. 5, after the pulling operation of the tensile material180, when the installation of the various structures is completed and the removal work of the tensile material180is performed, the tensile material180with a released tensile state is rotated.

At this time, the body130coupled to the strand wire wedge150also rotates in connection with the rotation of the tensile material180, and thus, the rotating main spring136coupled to the body130also rotates.

Therefore, while the upper part of the rotating main spring132rotates through the screw groove111of the waterproof cap110, since the spring is moved to the upper side of watertight cap110and the body130is also moved to the upper side in connection therewith, the strand wire wedge150coupled to the body130is also moved to release the locked state of the tensile material180.

Here, the strand wire wedge150is smoothly expanded by an elastic band (not illustrated) to release the locked state of the tensile material180, and pulls the rear end of the tensile material180in this state to remove the tensile material180in the slope.

In particular, in such an anchor body100, when rotating the tensile material180, the elasticity of the buffering auxiliary spring163acts on the waterproof cap110side to allow the strand wire wedge150to smoothly escape from the tapered hole151of the wedge hold150, and since the stopper131is in a crushed and removed state, it is moved to a position at which the separation of the strand wire wedge150can completely and sufficiently act and escape from the tapered hole151, and thus, it is possible to easily, conveniently and simply separate and remove the tensile material180, thereby smoothly separating and removing the tensile material180with only the man power.