KR101511104B1 - Prestrressing Strand Assembler and Ground Reinforcement Method Using Thereof - Google Patents

Abstract

The present invention is related to a prestressing strand assembly unit used for a soft ground improvement method and a method to improve ground foundation using the materials. The present invention consists of: strands; and a first strand assembly unit that ties a multiple number of strands by connecting each end so that the strands can be arranged in parallel with each other at a certain distance. As the outer circumference of the first strand assembly unit has a means to improve the pull-out resistance, the prestressing strand assembly unit can enhance the foundation strength. Desirably, the prestressing strand assembly unit further includes a cap which is coupled to one end of the first strand assembly unit and supports the separation of the strands or the wedge from the first strand assembly unit. The present invention can improve the strength of the ground by increasing the pull-out resistance and easier remove the strands because it is unnecessary for large force to remove the strands while the strand assembly unit and the cap are left under the ground, thereby improving productivity of the ground strengthening job and shortening the construction length.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a PC strand assembly and a ground reinforcement method using the same.

The present invention relates to a soft ground improvement method such as a permanent anchor, an earth anchor, rock bolt, ground anchor or soilless nailing, and more particularly to a PC strand assembly using a PC strand and a ground using the same Reinforced construction method.

In civil engineering work, when constructing from soft ground, it is usually soft ground improvement method such as grouting method and soilless nailing method. As an example of this kind of soft ground improvement method, the grouting method requires hard foundation ground in road construction. In the section of soft ground, in order to raise the hardness of the ground to the degree of hardness required for road construction . Soil nailing method is a method using slope reinforcement and stabilization of excavation surface. It usually excavates the slope to a stable height where slope or terraced excavation surface can be self-sustained, boring slope or excavation site, A step of installing a nail in a hole formed in the hole and grouting, a shotcrete pouring step for surface protection, a re-excavating step, a piercing step, a nail inserting and grouting step, and a shotcrete step.

A number of techniques have been proposed in connection with such soft ground improvement techniques. Among them, Korean Patent Publication No. 2003-0004187 (entitled "Nail Anchor for Slope Reinforcement Construction and Nail Anchor Method for Slope Reinforcement Construction, hereinafter referred to as Prior Art 1), Korean Patent No. 10-0446586. Title of the Invention: A dismantling type soil nail device which is easy to recover. Hereinafter referred to as prior art 2) and Korean Patent No. 10-1346635 (the name of the invention: a ground reinforcing apparatus and a ground reinforcement method using a PC reinforcement wire, hereinafter referred to as prior art 3). According to the prior arts 1 to 3, a technique of reinforcing the ground using a reinforcement line or an anchor in the soft ground improving method is introduced.

However, according to the prior arts 1 to 3 and the like, there are the following problems.

For example, it is important to remove the reinforcing bars used as the soil nail after the grouting operation. According to the prior arts 1 to 3, according to each of the proposed techniques, it is possible to obtain an effect of reinforcing the ground to some extent. There is a problem that it is difficult to remove easily. Particularly, in relation to such a problem, in the prior art 2, there is proposed a technology of a dismantling type soilless nail device which can be easily recovered. However, even when following the prior art 2, when the reinforcing bars are removed from one side of a soilless nail device located deep in the ground, It is not easy to remove the cursor. Especially when pulling out the reinforcing bar, it is difficult to remove the reinforcing bar because it acts as a resistance against the pulling of the reinforcing bar because the pressure is lowered as if the vacuum is set at one end of the reinforcing bar. Therefore, there has been a problem that air and cost are increased in construction.

It is an object of the present invention to provide a PC strand assembly for use in a soft ground improvement method that improves pull resistance at the ground level and is easy to remove when necessary have.

In order to achieve the above object, a PC strand assembly according to the present invention comprises a stranded wire; And a first stranded wire assembler which is fastened to each of the plurality of stranded wires at one end of each of the plurality of stranded wires so that a plurality of the stranded wires are arranged parallel to each other at a predetermined interval, And a resistance means for improving the resistance can be provided.

Here, the first stranded wire assembler includes a plurality of stranded wire insertion holes corresponding to the outer circumferential surface of each of the plurality of stranded wires as a fastening means, and each of the plurality of stranded wires is inserted into each of the plurality of stranded wire insertion holes It may be another feature.

Furthermore, another feature may be that a screw-shaped pattern corresponding to the outer circumferential surface of the strand is formed at least on a part of the inner side surface of the strand insertion hole.

Here, the resistance means for improving the pull-out resistance may be a ridge protruding by a predetermined height from the outer circumferential surface of the first stranded wire assembler.

A wedge for preventing unwinding of the strand is fastened to one end of the strand. The first stranded wire assemblage is provided with an outer circumferential surface of the stranded wire in a part of the inner side so as to be held while holding the stranded wire or the wedge, And a wedge coupling hole having a size corresponding to the outer circumferential surface of the wedge is provided at the other portion of the inner side of the first strand assembler so that the wedge can be coupled while holding the wedge. You may.

The cap further includes a cap coupled to one end of the first strand assembler to assist in separating the plurality of strands from the first strand assembler .

Further, it is preferable that the cap further includes a cap fastened to one end of the first strand assembler and assisting a plurality of the strands or the wedge to separate and detach from the first strand assembler You may.

Furthermore, the cap may include a cap body formed in a U-shape to protect and isolate one end of the first strand assembly assembled with the strand from the outside; Fastening means for fastening a cap at one end of the first strand assembler; And an engaging jaw formed at one side of the first strand assembler and inserted into the concave space at the inner side of the cab body so as not to be inserted over a predetermined depth. It is possible.

Here, a wedge is fastened to one end of the strand for preventing or suppressing the strand, and the first strand assembly is provided with a wedge fastening hole corresponding to an outer circumferential surface of the wedge, And a wedge guard inserted into the wedge fastening hole and provided at a portion of the fastening jaw such that the wedge fastened at one end of the first stranded wire assembly is not released.

Here, the cap body may be provided with resistance means for improving the pull-out resistance on the outer circumferential surface of the cap body.

Further, the resistance means provided on the outer circumferential surface of the cap body to improve the pull-out resistance may be a ridge protruding from the outer circumferential surface of the cap body by a predetermined height.

Here, the wedge guard may be made of plastic or a polymer composite material.

And a second stiffener assembly coupled to each of the plurality of stiffeners at a position spaced apart by a predetermined distance from the first stiffener assemblies fastened at one end of the plurality of stiffeners, A plurality of fastening holes through which a plurality of the stranded wires can be fastened while passing through the second stranded wire assembler are provided, and a screw-shaped pattern is formed on the inner surface of the fastening hole so as to be circumscribed on the outer circumferential surface of the stranded wire, And a resistance means for improving the pulling resistance is provided on the outer circumferential surface of the second stranded wire assembler.

Further, the resistance means for improving the pull-out resistance provided on the outer circumferential surface of each of the first strand assembler or the second strand assembler may be a frictional protrusion protruding from the outer circumferential surface of each of the first strand assembler and the second strand assembler by a predetermined height It may be another feature.

According to another aspect of the present invention, there is provided a ground reinforcement method for installing a PC strand assembly including a stranded wire in the ground, comprising the steps of: ; A step B for pushing one side of the strand to the empty space to remove the strand of the PC strand assembly installed in the step A; And a step (C) of removing the strand from the ground by pulling the strand pushed into the void space in the step B to the other side in the opposite direction.

Here, the empty space in the step A may be formed by fastening a pot to one end of the PC strand assembly and by embedding one end of the PC strand assembly to which the port is fastened, Can be secured as a further feature.

Since the PC strand assembly according to the present invention is provided with the resistance means for increasing the pulling resistance force on the outer circumferential surface of the strand assembler and the cap, it is possible to improve the soft ground improvement method such as permanent anchor, earth anchor, rock bolt, ground anchor, It has the effect of improving soil strength. In addition, it is easy to remove the stranded wire because it does not need much force to remove the strand by leaving only the strand assembler and the cap part in the ground. Therefore, the efficiency of construction work for the soft ground improvement method is greatly improved, There is an effect that can be.

1 is a schematic illustration of a PC strand assembly in accordance with an embodiment of the present invention.
Figure 2 is a perspective cross-sectional view schematically illustrating a first strand assembly of a PC strand assembly according to an embodiment of the present invention.
3 is a side sectional view schematically showing a wedge which is fastened to one end of a strand.
4 is a schematic cross-sectional view of a first stranded wire assembler of a PC strand assembly according to an embodiment of the present invention.
Figure 5 is a front view of one end of a PC strand assembly according to one embodiment of the present invention.
6 is a cross-sectional view schematically illustrating a cap of a PC strand assembly according to another embodiment of the present invention.
7 is a schematic cross-sectional view of a PC strand assembly according to another embodiment of the present invention.
8 is a schematic view of a PC strand assembly according to another embodiment of the present invention.
9 is a flowchart schematically showing a ground reinforcement method according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic illustration of a PC strand assembly in accordance with an embodiment of the present invention, and FIG. 2 is a perspective cross-sectional view schematically illustrating a first strand assembly of a PC strand assembly according to an embodiment of the present invention.

Referring to FIGS. 1 and 2, a PC strand assembly according to an embodiment of the present invention comprises a strand 10 and a first strand assembler 100.

The strand (10) refers to one made of a thick wire by twisting several strands of steel wire together. Since this is not largely different from a normal strand, the description of the strand 10 itself will be omitted.

The first strand assembler 100 is fastened to each of the plurality of strands 10 at one end of each of the plurality of strands 10 so that the plurality of strands 10 are disposed parallel to each other at a certain interval. The outer circumferential surface 120 of the first strand assembler 100 is provided with a resistance means for improving the pull-out resistance.

The PC strand assembly including the first strand assembler 100 and the strand 10 due to the resistance means provided on the outer circumference 120 of the first strand assembler 100 has improved pull-out resistance. The friction protrusions 123 are preferable as the resistance means. The friction protrusions 123 protrude from the outer circumferential surface 120 of the first strand assembler 100 by a predetermined height. Such a friction protrusion 123 enhances the pull resistance in the ground.

The first strand assembler 100 is provided with a plurality of stranded wire insertion holes 110 corresponding to the outer circumferential surfaces of the plurality of stranded wires 10 as fastening means for fastening the stranded wire 10 thereto. Each of the plurality of stranded wires 10 is inserted into each of the plurality of stranded wire insertion holes 110 and fastened thereto.

It is also possible that the inner circumferential surface of the first strand assembler 100 forming the strand insertion hole 110 is a hole (not shown) having a nonuniform pattern. In order to improve the fastening performance with the strand 10, it is preferable that a screw-shaped pattern 113 corresponding to the outer circumferential surface of the strand 10 is formed in an intaglio.

Since the outer circumferential surface of the strand 10 is well fitted into the screw-shaped pattern 113 formed at an obtuse angle corresponding to the outer circumferential surface of the strand 10, the entire outer circumferential surface of the strand 10 is inserted into the first strand through the strand insertion hole 110, Tightened to the assembler (100).

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 3 to 5. FIG.

FIG. 3 is a side cross-sectional view schematically showing a wedge that is fastened to one end of a strand, FIG. 4 is a schematic cross-sectional view of a first stranded assembler of a PC strand assembly according to an embodiment of the present invention, Figure 5 is a front view of one end of a PC strand assembly according to one embodiment of the present invention.

3 to 5, a wedge 30 is fastened to one end of the strand 10 to prevent the strand 10 from loosening.

The wedge 30 is tapered from one side toward the other side with respect to the rotation center axis as shown in Fig. It is preferable that the wedge 30 is fastened at one end of the strand 10 and the larger diameter (or outer diameter) is fastened at one end of the strand 10. [ Here, the stranded wire 10 is inserted into a hole provided at the center of the wedge 30 and is fastened. The diameter of the hole provided at the center of the wedge 30 is formed so as to coincide with the outer diameter of the stranded wire 10 so that the wedge 30 can be fastened.

As shown in FIG. 4, the first stranded wire assembler 200 is provided with a stranded wire inserting hole 231 corresponding to the outer circumferential surface of the stranded wire 10, as shown in FIG. 4, to be fastened while holding the stranded wire 10 or the wedge 30. (Not shown). In other words, the stranded wire insertion hole 210 is provided so as to fit the outer diameter of the stranded wire 10. In the stranded wire insertion hole 210, a screw-shaped pattern 213 is formed corresponding to the shape of the outer peripheral surface of the stranded wire 10. By providing such a stranded wire insertion hole 210, the stranded wire 10 can be fastened to the first stranded wire assembler 200.

As shown in FIG. 4, a wedge fastening hole (not shown) having a size corresponding to the outer circumferential surface of the wedge 30 is formed in the remaining part of the inner side of the first strand assembler 200 so that the wedge 30 can be fastened while being held. (Not shown).

In other words, the stranded wire insertion hole 210 is formed so that one end of the stranded wire 10 to which the wedge 30 is fastened can be inserted into the stranded wire insertion hole 210 and the wedge coupling groove 230 of the first stranded wire assembly 200, And the wedge engagement groove 230 is formed to correspond to the tapered outer diameter of the wedge 30. The wedge engagement groove 230 is formed to correspond to the outer diameter of the stranded wire 10,

5, the stranded wire 10 and the wedge 30 are inserted into the stranded wire insertion hole 210 and the wedge jointed groove 230 formed in the first stranded wire assembler 200 and can be fastened together.

Next, a cap of a PC strand assembly according to another embodiment of the present invention will be described.

FIG. 6 is a cross-sectional view schematically illustrating a cap of a PC strand assembly according to another embodiment of the present invention, and FIG. 7 is a schematic cross-sectional view of a PC strand assembly according to another embodiment of the present invention.

Referring to FIGS. 6 and 7, the PC strand assembly according to another embodiment of the present invention further includes a cap.

As shown in FIG. 7, the cap is fastened to one end of the first strand assembler 200. And assists in detaching a plurality of strands 10 or wedges 30 from the first strand assembly 200. The cap 300 also prevents or suppresses damage of the plurality of strands 10 fastened to one end of the first strand assembler 200 due to external influences.

The cap includes a cap body 310, fastening means 320, and a latching jaw 330.

The cap body 310 is preferably formed in a U-shape to protect or isolate one end of the first strand assembler 200 fastened to the strand 10 from the outside. The U-shaped cap body 310 is provided with a hollow space inside which a plurality of stranded wires 10 or wedges 30 are separated from the first stranded wire assembler 200 So that it can be easily separated.

The coupling means 320 for fastening the cap body 310 and the first strand assembler 200 to each other is provided to fasten the cap 300 at one end of the first strand assembler 200. As an example of such a fastening means 320, it is preferable to fasten using bolts and nuts as shown in Fig. Here, it can be said that the form to be fastened by an adhesive or other method other than bolts and nuts is also possible.

One end of the first strand assembler 200 is inserted into the concave space inside the cap body 310 and is formed on the concave space side inside the cap body 310 so as not to be inserted over a predetermined depth .

The hooking jaw 330 formed in this manner is formed in such a manner that when the stranded wire 10 and the first stranded wire assembler 200 are inserted into the U-shaped cap body 310 of the cap and are fastened together, the one end of the stranded wire 10 and the first stranded wire Only a portion of one end of the assembler 200 is inserted and a portion of one end of the first strand assembler 200 is engaged so that it is no longer inserted.

As the first strand assembler is caught by the engaging jaws 330, a space 315 isolated from the outside is formed between the cab body 310 and the first strand assembler 200.

When the wedge 30 is fastened to one end of the strand 10 and the wedge fastening hole 230 corresponding to the outer circumference of the wedge 30 is provided in the first strand assembler 200 , And the cap preferably further comprises a wedge guard (340).

Here, the wedge guard 340 is for preventing the wedge 30 fastened to the strand 10 from being separated, disassembled, or displaced in a state where the wedge 30 is inadvertently engaged.

The wedge guard 340 is inserted into the wedge fastening hole 230 and is preferably provided on at least a part of the fastening protrusion 330 so that the wedge 30 fastened at one end of the first strand assembler 200 is not released. Do.

The wedge guard 340 may be made of the same material as that of the cap body 310, but it is more preferable that the wedge guard 340 is formed of plastic or a polymer composite material as the material of the wedge guard 30. Particularly, it is preferable that the wedge guard 340 can be broken when a predetermined external force is applied to one side of the stranded wire 10. In other words, the wedge guard 340 is made of a material capable of pushing the wedge 30 and one side of the strand 10 into the internal space 315 of the cap body 310 while the wedge guard 340 is broken desirable.

A description will now be made of a process of assisting the separation of the stranded wire 10 or the wedge 30 from the first stranded wire assembly 200 when the cap 300 is further included.

As described above, the cap body 310 formed in a U-shape has an empty space 315 inside. In the step of removing the strand 10 after the normal grouting operation, if the strand 10 is pulled out, it is difficult to remove the strand 10 from the ground due to the contact friction.

However, in the case of the PC strand assembly according to the present invention, the stranded wire 10 is pushed into the hollow space 315 inside the cap body 310. In this process, the first strand assembler 200 is not pushed due to the latching jaws 330. However, when the stranded wire 10 and the wedge 30 are strongly pushed, the wedge guard 340 is broken and the stranded wire 10 and the wedge 30 are pushed into the hollow space 315 of the cap body 310 together) . The wedge 30 or the wedge guard 340 is damaged in the empty space of the cap body 310.

The wedge guard 340 is pushed to one side by a force that can break the wedge guard 340 so that one end of the strand 10 floats in the empty space 315 of the cap body 310.

In this state, when the strand 10 is pulled to the other side, since the contact friction force at one end of the strand 10 is remarkably reduced, the strand 10 can be easily removed even with a small force.

If there is no empty space at one end of the strand, the pressure is low at the periphery so that it is difficult to pull the strand out of the ground. However, due to the empty space 315 at one end of the strand 10, The empty space 315 due to the presence of the cap 300 compared to the case where there is no empty space 315 because there is no cap 300 when the strand 10 is drawn out, It is possible to easily pull out the strand 10 because the resistance due to the pressure difference (i.e., resistance against the pulling force) is reduced.

The plurality of stranded wires 10 or the wedges 30 can be easily separated from the first stranded wire assembler 200 due to the empty space 315 provided inside the cap body 310 of the cap.

It is further preferable that the outer circumferential surface of the cap body 310 is further provided with a resistance means for improving the pull-out resistance. As an example of such a resistance means, a frictional protrusion of the same type as the resistance means of the first strand assembler 200 described above is preferable as shown in Fig.

In other words, it is preferable that the protrusion is a protrusion protruding from the outer peripheral surface of the cap body 310 by a predetermined height. Because of the friction protrusion, the area of the ground soil or the like closely contacting the outer circumferential surface of the cap body 310 is increased, so that the pullout resistance in the ground can be further improved.

Next, another application, which further includes the second assembly, will be described.

8 is a schematic view of a PC strand assembly according to another embodiment of the present invention.

Referring to FIG. 8, the PC strand assembly according to another embodiment of the present invention further includes a second strand assembler in the above-described embodiment. Therefore, the strand 10, the first strand assembler 200, and the cap 300 are as described above, and thus the second strand assembler 400 will be briefly described.

The second strand assembler 400 is mostly similar to the first strand assembler 200 described above.

The second strand assembler 400 is provided with a plurality of strand assemblies 400 at a position spaced apart from the first strand assembler 200 fastened at one end of the plurality of strands 10, And is fastened to each of the strands 10.

The predetermined spacing may be set by the user in accordance with design needs when manufacturing the PC strand assembly. The presence of multiple stiffener assemblers can result in a more robust PC strand assembly.

As in the first strand assembler 200, the plurality of stranded wires 10 are each provided with a plurality of stranded wire insertion holes (not shown) which can be fastened while penetrating the second stranded wire assembler 400 ).

The inner circumferential surface of the second strand assembler 400 forming the stranded wire insertion hole may be a regular hole having a nonuniform pattern. In order to further improve the fastening performance with the strand 10, it is preferable to form a screw-shaped pattern corresponding to the outer circumferential surface of the strand 10 (this is an intaglio).

Since the outer peripheral surface of the strand 10 is well fitted into the screw-like pattern formed at the engraved surface so as to correspond to the outer circumferential surface of the strand 10, the entire outer peripheral surface of the strand 10 is closely contacted with the second strand assembler 400 through the strand insertion hole .

A screw-shaped pattern is formed on the inner surface of the fastening hole so as to be circumscribed on the outer circumferential surface of the stranded wire 10 in the stranded wire insertion hole 210 of the second stranded wire assembler 400, Is the same as the stranded insertion hole 210 of the first strand assembler 200 in the previously described embodiment.

Resistance means for improving the pull-out resistance is provided on the outer circumferential surface of each of the first strand assembler (200) or the second strand assembler (400).

The PC strand including the first strand assembler 200, the second strand assembler 400 and the strand 10 due to the resistance means provided on the outer circumferential surface of each of the first strand assembler 200 or the second strand assembler 400. [ The assembly has improved pull-out resistance.

The resistance means for improving the pull resistance provided on the outer circumferential surface of each of the first strand assembler 200 or the second strand assembler 400 may be formed on the outer circumferential surface of each of the first strand assembler 200 or the second strand assembler 400 It is preferable that the friction protrusions are protruded by a predetermined height.

This friction protrusion enhances the pullout resistance in the ground.

Next, a ground reinforcement method according to the present invention will be described.

9 is a flowchart schematically showing a ground reinforcement method according to an embodiment of the present invention.

Referring to FIG. 9, the ground reinforcement method according to the embodiment of the present invention includes steps A through C.

<S101>

In step A, the PC strand assembly including the strand is installed in the ground. At this time, the one end of the strand is installed so as to be located in the ground, and the one end of the strand is secured in the ground while being provided with an empty space.

The PC strand assembly may be variously installed in the ground while securing an empty space at one end of the strand, wherein the PC strand assembly is more preferable for the PC strand assembly in the embodiment described above.

Let's take an example of one of them.

A pot is fastened at one end of the PC strand assembly to secure the empty space at one end of the strand and to be installed in the ground. Here, an empty space is provided between the port and one end of the PC strand assembly to be fastened.

Then, the PC strand assembly with the port fastened at one end is buried in the ground.

That is, the empty space can be secured by embedding one end of the PC strand assembly in which the port is fastened in the ground.

Here, the port is a type of light that can include a cap of a PC strand assembly according to the above-described embodiment of the present invention, in which a part of a cross section is U-shaped, one end of the strand is isolated from the outside, It is preferable that the port is formed so that an empty space may be provided between one end.

In other words, the port serves as a housing that can isolate one end of the strand from the outside and form an empty space around one end of the strand.

This step can be performed by fastening such a port to one end of the PC strand assembly and embedding it in the ground.

<S102>

Next, in step B, one side of the strand is pushed into the empty space in order to remove the strand of the PC strand assembly installed in step A above.

Particularly, when the port is fastened to one end of the PC strand assembly, one side of the strand is pushed into the empty space, so that separation and separation of the strand from the PC strand assembly and the ground can be facilitated.

That is, in the case of using the PC strand assembly in the above-described embodiment, the strand can be separated from the PC strand assembly in this step.

<S103>

In step C, the stranded wire pushed into the hollow space in step B is pulled to the other side opposite to the one side to remove the stranded wire from the ground.

When the strand is pulled out to the other side, it is easily separated and separated from the PC strand assembly and the ground.

That is, since the resistance to pulling the stranded wire to the other side is relaxed, the stranded wire can be easily separated or removed because the state of fastening the stranded wire is weakened so that the stranded wire can be easily removed from the PC stranded wire assembly. The resistive force at one end of the strand is relaxed to a considerable extent.

In this way, the strand of the PC strand assembly can be easily removed from the PC strand assembly and the strand of strand.

As described above, since the PC strand assembly according to the present invention is provided with the resistance means for increasing the pull-out resistance on the outer surface of the steel wire assembler and the cap, the pull resistance is increased and the ground strength is improved.

In addition, since the strand assembler and the cap are left in the ground and there is no need to remove the strand, the removal of the strand can be facilitated, which greatly improves the efficiency of the ground reinforcement work.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the scope of the present invention is to be construed as being limited only by the embodiments, and the scope of the present invention should be understood as the following claims and their equivalents.

10: Strand 30: wedge
100, 200: First Strand Assembler
110, 210: stranded wire insertion hole 120: outer peripheral surface
123: Friction projection 230: Wedge fastening hole
300: cap
310: cap body 320: fastening means
330: jaw chin 340: wedge guard
400: Second Stranded Assembler

Claims (17)

delete ; And
And a first stranded wire assembler which is fastened to each of the plurality of stranded wires at one end of each of the plurality of stranded wires so that the plurality of stranded wires are arranged parallel to each other at a constant interval,
Resistance means for improving the pull-out resistance is provided on the outer circumferential surface of the first strand-
The resistance means for improving the pull-out resistance is a rubbing protrusion protruding from the outer circumferential surface of the first strand assembler by a predetermined height. A wedge for fastening the strand is fastened to one end of the strand,
In the first strand assembler,
A stranded wire insertion hole corresponding to the outer circumferential surface of the stranded wire is provided at a part of the inner side so as to hold the stranded wire or the wedge while holding the stranded wire or the wedge,
A wedge coupling hole having a size corresponding to an outer circumferential surface of the wedge is provided in the remaining part of the inner side of the first strand assembler so that the wedge can be coupled while holding the wedge,
And a cap coupled to one end of the first strand assembler to assist in separating the plurality of strands or the wedge from the first strand assembler,
The cap
A cap body formed in a U-shape so as to protect and isolate one end of the first strand assembly assembled with the strand;
Fastening means for fastening a cap at one end of the first strand assembler;
A first end of the first strand assembler is inserted into a concave space inside the cab body and is formed into a recessed space side inside the cab body so as not to be inserted over a certain depth; And
And a wedge guard inserted into the wedge fastening hole and provided at a part of the fastening jaw such that the wedge fastened at one end of the first stranded wire assembly is not released,
Wherein when the wedge guard is damaged by receiving a predetermined external force in one direction of the strand, the wedge and one side of the strand are pushed into the concave space on the inside of the cap body, Wherein the wedge guard breaks down. delete delete delete delete delete delete delete delete The method according to claim 1,
Wherein the cap body is provided with a resistance means for improving the pull-out resistance,
Wherein the resistance means provided on the outer circumferential surface of the cap body to improve the pull-out resistance is a rubbing protrusion protruding from the outer circumferential surface of the cap body by a predetermined height. delete delete The method according to claim 1,
Further comprising: a second strand assembly assembled with each of the plurality of strands at a position spaced apart from the first strand assembler at one end of the plurality of strands by a predetermined distance,
In the second strand assembler,
A plurality of fastening holes through which each of the plurality of stranded wires can be fastened while passing through the second stranded wire assembler is provided, and a screw-shaped pattern is formed on the inner surface of the fastening hole so as to be circumscribed on the outer circumferential surface of the stranded wire, In addition,
And an outer circumferential surface of the second strand assembler is provided with resistance means for enhancing the pull-out resistance. 14. The method of claim 13,
The resistance means for enhancing the pull resistance provided on the outer circumferential surface of each of the first strand assembler or the second strand assembler is a ridge projected by a predetermined height with respect to the outer circumferential surface of each of the first strand assembler and the second strand assembler PC strand assembly. A stage where the PC strand assembly including the strand is installed in the ground, the strand is buried in the ground while securing the empty space at one end of the strand;
A step B for pushing one side of the strand to the empty space to remove the strand of the PC strand assembly installed in the step A, thereby separating the wedge connected to one end of the strand into the empty space; And
And removing the stranded wire from the ground by pulling the stranded wire pushed into the void space to the other side in the opposite direction in step B,
The PC strand assembly comprises:
14. A method of reinforcing a ground reinforcement according to any one of claims 1, 10, 13 to 14. 16. The method of claim 15,
The empty space in the step (A)
The empty space is secured by fastening a pot to one end of the PC strand assembly and by embedding one end of the PC strand assembly with the port in the ground,
The port
14. A method of reinforcing a ground reinforcement of a PC strand assembly according to any one of claims 1, 10, 13 to 14.

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