KR101074765B1 - Anchor assembly for retrieval - Google Patents

Abstract

The present invention is the tension material protection tube 110 is installed so that the grout does not flow into the interior; A tension member 120 inserted into the tension member protection tube 110; In order to support and release the lower end of the tension member 120, recoverable tension member fixing device 200 installed on the lower end of the tension member protection tube 110, including, the recovery tension member fixing device 200 of the tension member 120 Wedge member 210 detachably coupled to the bottom; In addition to being installed at the lower end of the acupressure steel pipe 111, the tension member through hole 221, the wedge member fixing hole 222 and the wire through hole 223 is formed, the wedge to prevent the front separation of the tension member 120 A fixing plate 220 to which the member 210 is fixed; A protective cap 230 installed to protect the wedge member 210 and the fixing plate 220 from the grout, and a wire locking member 231 installed at the inner core portion; To recover the tension member 120, the wedge member 210 is coupled to the wedge member 210 so that the wedge member 210 is separated to the lower side, and the other end of the wedge member 210 is provided with the wire catching member 231 to provide a head through the wire through hole 223. 10) by presenting the retrievable anchor assembly 100 including a wedge member detachment wire 250 installed to be exposed to the side, to facilitate the removal of the tension material, while ensuring sufficient strength.

Anchor, reclaim, wire

Description

Retractable Anchor Assembly {ANCHOR ASSEMBLY FOR RETRIEVAL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of construction, and more particularly, to the structure of anchors used for fixing earth walls.

The recoverable anchor assembly is a kind of temporary material, which is installed once for fixing the earth wall and the like, and after completion of construction of the main structure, refers to a structure for removing and recovering tension members (steel bars, strands, rebars, etc.) constituting the anchor assembly.

Various means have been devised to easily separate the tension member from the anchor assembly.

1 is a cross-sectional view of a conventional retractable anchor assembly.

The lower end of the tension member 2, which penetrates the fixing tip portion 1 formed at the lower end of the anchor assembly, is embedded in the ground in the state of being fixed by the fixing nut (3, a kind of liner screw), and the anchor assembly is removed when the tension member is removed. By loosening the tightening nut 5 formed on the upper pressure plate 4 and rotating the tension member, the tension nut 2 is removed by separating the fixing nut 3 from the lower end of the tension member.

In order to protect the tension member 2 from the external grout, a protective tube 6 made of a resin material or the like is provided on the outer circumference of the tension member.

In the anchor assembly of this structure, the fixing tip 1 of the upper end is fixed by the grout inside the perforation hole, and the tension member 2 fixed to the fixing tip 1 of the lower end is tensioned and fixed to the pressure plate 4 of the upper part. By resisting the earth pressure.

This conventional structure had the following problems.

First, it is difficult to obtain sufficient anchor strength.

As described above, since the protective tube 6 made of a resin material or the like cannot exhibit any strength against earth pressure, only the fixing tip portion 1, to which the upper end of the tension member 2 is coupled, is embedded in the grout, and the grout solidified body is uniaxially formed. As a state of stress, it takes a method of resisting earth pressure, which has a problem that the anchor is broken only when the solid body reaches yield strength in a uniaxial stress state.

Second, it is difficult to remove the tension material.

Basically, the tension member has a configuration in which the lower end thereof is coupled to the lower end (tip) of the anchor assembly, and the lower end of the anchor assembly is embedded in the ground of high depth, so that the tension member is removed from the head of the anchor assembly to remove the tension member from the anchor assembly. By pivoting or striking the tension member, the bottom of the tension member should be released from engagement with the top of the anchor assembly.

By the way, the anchor assembly fixed in the boring hole of the ground can not avoid the bending deformation to some extent by earth pressure or other load during construction or after construction. The problem is that the removal is very difficult.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a retractable anchor assembly that is easy to remove the tension material, while ensuring sufficient strength.

The present invention to achieve the object as described above, the tension member protective tube 110 is installed so that the grout does not flow into the interior; A tension member 120 inserted into the tension member protection tube 110; It includes; and the retractable tension member fixing device 200 installed on the lower end of the tension member protection tube 110, so as to support and release the lower end of the tension member 120, the recovery tension member fixing device 200 includes the tension member Wedge member 210 detachably coupled to the bottom of the 120; In addition to being installed at the lower end of the tension protection tube 110, the tension member through hole 221, the wedge member fixing hole 222 and the wire through hole 223 is formed, and prevents the front separation of the tension member 120 A fixing plate 220 to which the wedge member 210 is fixed; A protective cap 230 installed to protect the wedge member 210 and the fixing plate 220 from the grout, and a wire locking member 231 installed at the inner core portion; The wedge member 210 is coupled to the wedge member 210 so that the wedge member 210 is separated to the lower side when the tension member 120 is recovered, and the other end is provided with the wire catching member 231 so that the wire through hole 223 is provided. Presents a retractable anchor assembly 100 comprising a; wedge member detachment wire 250 installed to be exposed to the head 10 side through).

The recoverable tension fixing device 200 is installed at the lower side of the fixing plate 220, and the wedge member detachment auxiliary plate 260 having the wedge member coupling hole 261 and the wire through hole 262 formed at the core portion. Further provided, the wedge member 210 is coupled to the fixing plate 220 by placing the wedge member detachment plate 260, one end of the wedge member detachment wire 250 is the wedge member detachment It is preferable to couple to the auxiliary plate 260.

The wedge member detachment wire 250 includes a plurality of auxiliary plate coupling parts 251, one end of which is coupled to an edge of the wedge member detachment auxiliary plate 260; One end is coupled to the other end of the plurality of auxiliary plate coupling portion 251, it is preferable to include an extension portion 252 is formed so that the other end is caught by the wire locking member 231.

The recoverable tension fixing device 200 has a through hole of the wedge member detachment wire 250 is formed in the core portion, one end is connected to the wire through hole 223 of the fixing plate 220, the other end is the head It is preferable to further include a wire protective tube 270 installed inside the tension member protective tube 110 to be exposed to the (10) side.

One end of the wire protection tube 270 is installed to penetrate the wire through hole 223 of the fixing plate 220, and the separation of the protection tube from the outer circumference of the wire protection tube 270 in the inlet region of the wire through hole 223. It is preferable that the member 271 is provided.

The protective tube fixing member 272 may be installed at an outer circumference of the wire protective tube 270 in the outlet area of the wire through hole 223 of the fixing plate 220.

The tension member protective tube 110 includes a shiatsu steel pipe 111 is installed to have a length corresponding to the anchorage area of the anchor, the lower end of the shiatsu steel pipe 111 is preferably coupled to the fixing plate 220.

The upper surface of the fixing plate 220 is formed with a coupling groove 224 for coupling with the acupressure steel pipe 111, the lower end of the acupressure steel pipe 111 is preferably screwed to the coupling groove 224. .

It is preferable that the packer mounting portion 110a on which the pressure grouting packer P is mounted is formed in the upper region of the acupressure steel pipe 111.

The acupressure steel pipe 111 and the pressure-retaining anchor assembly 100 to maintain the coupled state to prevent the separation of the wedge member 210, as well as to escape during the tension work of the tension member 120, It is preferable to further include a temporary coupling member 280 for preventing wedge member detachment temporarily coupled between the tension member 120.

The temporary coupling member 280 for preventing the wedge member departure is preferably a pointed wedge structure toward the bottom.

The present invention provides a retractable anchor assembly that allows easy removal of the tension member while ensuring sufficient strength.

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

As shown in Figure 2 below, the present invention, basically, the tension member protection tube 110 is installed so that the grout does not flow into the interior; A tension member 120 inserted into the tension member protection tube 110; It is configured to include; and to recover and support the lower end of the tension member 120, the retractable tension member fixing device 200 installed on the lower end of the tension member protection tube (110).

(Hereinafter, the expressions of "top" and "bottom" are for ease of understanding with reference to the drawings, which mean "head side end of the anchor" and "tip side end of the anchor", respectively.)

Here, the retractable tension fixing device 200, the wedge member 210 detachably coupled to the lower end of the tension member 120; In addition to being installed at the lower end of the acupressure steel pipe 111, the tension member through-hole 221, the wedge member fixing hole 222 and the wire through-hole 223 is formed in the core, so as to prevent the front separation of the tension member 120 A fixing plate 220 to which the wedge member 210 is fixed; A protective cap 230 installed to protect the wedge member 210 and the fixing plate 220 from the grout, and a wire locking member 231 installed at the inner core portion; To recover the tension member 120, the wedge member 210 is coupled to the wedge member 210 so that the wedge member 210 is separated to the lower side, and the other end of the wedge member 210 is provided with the wire catching member 231 to provide a head through the wire through hole 223. 10) the wedge member detachment wire 250 installed to be exposed to the side; is configured to include.

That is, when the tension member 120 is installed, the wedge member 210 is placed to fix the lower end of the tension member 120 to the fixing plate 220, and when the tension member 120 is collected, the wedge member is disposed at the head 10 side. By pulling the wire 250 for release, the wire 250 pulls the wedge member 210 downward so as to be separated from the fixing plate 220, so that the tension member 120 restrained by the wedge member 210 is removed. The lower end is to deviate from the settlement (Figs. 4, 6, 7).

This allows the lower end of the tension member 120 to be fixed to the fixing plate 220 by the wedge member 210 during the insertion operation of the anchor assembly 100 and the construction of the main structure, and after completion of the construction of the main structure, the tension member As the wedge member 210 is separated from the fixing plate 220 by the tension relief of the 120 and the pulling action of the wire 250, the tension member 120 may be removed to the head 10.

In the case of applying such a structure, the tension member 120 is removed only by pulling the wire 250 at the head 10 side without any need to rotate or strike the tension member as in the prior art to remove the tension member 120. As a result, it is possible to obtain an effect that the removal of the tension member becomes very easy.

The wedge member detachment wire 250 is driven by being caught by the wire locking member 231 of the protective cap 230, and when the wire 250 is pulled upward from the head 10 side, the wedge member 210 is lowered. Pull and release the bond.

To this end, one end of the wire 250 may take a configuration directly coupled to the wedge member 210 (FIG. 4), but by placing a separate wedge member detachment auxiliary plate 260, one end and the wedge member of the wire 250. It is also possible to take a configuration in which 210 is combined (FIGS. 5, 8, and 9).

Here, the wedge member detachment auxiliary plate 260 is installed on the lower side of the fixing plate 220, and takes the configuration in which the wedge member coupling hole 261 and the wire through hole 262 are formed in the core portion.

At this time, the wedge member 210 is coupled to the fixing plate 220 by placing the wedge member detachment plate 260, one end of the wedge member detachment wire 250 is coupled to the wedge member detachment auxiliary plate 260. do.

In this configuration, the force applied to the wire 250 for the recovery of the tension member 120 acts evenly on the wedge member 210 through the wedge member detachment auxiliary plate 260, and the above recovery operation is further performed. There is an advantage that it can be performed stably and easily.

The wedge member detachment wire 250 may have a linear structure, and a plurality of wedge member detachment wires 250 may be coupled to the wedge member 210, but as shown in FIGS. 4, 5, and 9, one end of the wedge member detachment auxiliary plate 260. A plurality of auxiliary plate coupling portion 251 coupled to the edge of the; One end is coupled to the other end of the plurality of auxiliary plate coupling portion 251, the other end extending portion 252 is formed to be caught by the wire locking member 231; may take a configuration including a.

That is, in the latter, one end of the extension part 252, which is a linear structure, is divided into a plurality of strands to form a plurality of auxiliary plate coupling parts 251, and the auxiliary plate coupling parts 251 are respectively formed on the wedge member detachment auxiliary plate 260. It is a composition combined with the edge of the).

This allows the pulling force of one wire 250 to be evenly transmitted to the edge of the wedge member detachment auxiliary plate 260 by the plurality of auxiliary plate coupling portion 251, the wedge member 210 for the recovery of the tension member 120 ) Has the advantage of making the separation operation easier and more stable.

The wedge member detachment wire 250 may take a structure inserted into the tension member protection tube 110 without a separate protective structure, but in order to prevent damage due to interference with the tension member 120 installed around the separate member. It is preferable to take the structure covered and protected by the wire protection tube 270.

Here, the wire protection tube 270 is formed with a through hole of the wedge member detachment wire 250 in the core portion, one end is connected to the wire through hole 223 of the fixing plate 220, the other end is exposed to the head 10 side. It is installed inside the tension tube protection tube 110 as much as possible.

On the other hand, after the recovery of the tension member 120 is completed, the fixing plate 220, the protective cap 230 and the like is buried in the ground, the space formed thereby may cause the strength of the adjacent ground to drop.

However, when the wire protection tube 270 is configured to be connected to the wire through hole 223 of the fixing plate 220 as described above, the grouting in the space formed by the fixing plate 220 and the protective cap 230 once again through this. As a result, the above-mentioned problem can be solved.

When the wire protection tube 270 is not firmly fixed to the fixing plate 220, the wire protection tube 270 is separated from the tension member 120 during the installation work, the tension work, and the pulling operation of the wire 250. There may be a problem.

In order to solve this, as shown in FIG. 10, one end of the wire protection tube 270 is installed to penetrate the wire through hole 223 of the fixing plate 220, and the wire protection tube in the inlet region of the wire through hole 223. It is preferable that the wire protection tube 270 is not separated from the wire through hole 223 of the fixing plate 220 by taking the configuration in which the protection tube detachment preventing member 271 is provided on the outer circumference of the 270.

The protective tube detachment preventing member 271 may be implemented by winding a tape around the lower periphery of the wire protective tube 270 that passes through the wire through hole 223 of the fixing plate 220.

For this purpose, the protective tube fixing member 272 is preferably provided on the outer circumference of the wire protective tube 270 in the outlet area of the wire through hole 223 of the fixing plate 220, and the protective tube fixing member 272 also has a wire. The tape may be wound around the outer circumference of the protective tube 270.

The tension protection tube 110 may take a configuration integrally formed by a steel pipe, a synthetic resin material, or the like, but includes a shiatsu steel pipe 111 installed to have a length corresponding to the anchorage region L1 of the anchor, and the shiatsu steel pipe 111. It is more preferable that the lower end of the configuration is coupled to the fixing plate 220.

When the anchor assembly 100 having such a structure is embedded in the ground by grouting, the following effects can be obtained.

First, the grout solidified body around the acupressure steel pipe 111 is placed in a three-axis stress state, it can exhibit a very large strength compared to the case where it is placed in a uniaxial stress state as in the prior art.

Even in the case of a structure made of the same material, when the structure is subjected to triaxial compression, the structure exhibits much greater strength due to external constraints (more effect).

Therefore, the grout solidified body around the acupressure steel pipe 111 receives not only the compressive force in the front-rear direction (the longitudinal direction of the tension member), but also the compressive force on the side of the punched hole. Compressive strength) can be much greater than the strength (Fig. 4, 5).

Secondly, the acupressure steel pipe 111 serves as a reinforcement itself embedded in the grout solidified body, it can contribute to the enhancement of the strength of the anchor.

In the conventional anchor structure, the protective tube 6 made of a resin material or the like installed on the outside of the tension member cannot exhibit any strength against earth pressure, whereas in the case of the anchor structure according to the present invention, due to the rigidity of the acupressure steel pipe 111. As it serves as a reinforcement itself, greater anchor strengths can be expected.

Third, the efficient use of materials can be achieved.

The anchor assembly 100 according to the present invention does not take the structure of the steel pipe over the entire area of the protective tube 110, but takes a structure in which the shiatsu steel pipe 111 is installed only in the lower portion of the anchor assembly 100, this portion is After all, it corresponds to the anchorage area of the anchor, it is possible to obtain sufficient strength only by this structure.

Therefore, while sufficient strength can be obtained, the overall cost of the material can be reduced, and the size of the structure buried in the ground after the removal of the tension material can be reduced, thereby minimizing the impact of the excavation work on the adjacent ground. The effect can be obtained.

Fourth, it is possible to facilitate the recovery of the tension material in the future.

Due to its rigidity, the acupressure steel pipe 111 is characterized in that deformation does not occur even when pressure grouting is applied to the outside, thereby stably securing the inner region.

Therefore, when the tension member 120 of the retractable anchor is installed therein, since the interference does not occur between the tension member 120 and the acupressure steel pipe 111 or the protection tube 110 that protects the tension member 120, The advantage is that the recovery operation can be facilitated.

Acupressure steel pipe 111 and the fixing plate 220 may take a variety of coupling structures, in order to further increase the strength of the anchor through these rigid coupling, with the acupressure steel pipe 111 on the upper surface of the fixing plate 220 Coupling groove 224 for the coupling is formed, the lower end of the acupressure steel pipe 111 is preferably to take the structure screwed to the coupling groove 224.

When a pressure grouting packer P is mounted on the packer mounting portion 110a of the upper region of the acupressure steel pipe 111 and pressurized grouting is carried out around the acupressure steel pipe 111, a more secure anchor structure can be obtained. There, the construction process is as follows (Fig. 2, 3).

A perforated hole is formed in the ground, and the pressure grouting packer P is installed in the packer mounting portion 110a of the retractable anchor assembly 100, and then the retractable anchor assembly 100 is inserted into the perforated hole.

Inflating the pressure grouting packer (P) is fixed to the inner wall of the adjacent drilling hole, for this purpose, grout, air and the like can be injected into the inside of the packer (P).

Pressurized grouting and curing is performed in the lower region of the inflated pressurized grout packer P, that is, the anchorage region of the drilled hole.

When the curing of the grout is completed, the tension member 120 is tensioned and fixed to the head 10, and grouting is performed in the free field region (upper region of the packer) of the drilling hole.

On the other hand, in the case of taking the structure as described above, during the insertion of the anchor assembly 100 for the drilling hole, the wedge member 210 is separated by the problem that the coupling of the lower end of the tension member 120 and the fixing plate 220 is released May occur.

In order to prevent this, to maintain the coupled state during insertion of the retractable anchor assembly 100 to prevent separation of the wedge member 210, and to escape during the tension operation of the tension member 120, acupressure steel pipe 111 It is preferable to take a configuration further comprising a temporary coupling member 280 for preventing wedge member detachment temporarily coupled between the tension member 120 (FIGS. 11 and 12).

That is, the temporary coupling member 280 for preventing the wedge member is coupled between the acupressure steel pipe 111 and the tension member 120 during the insertion of the anchor assembly 100 to prevent the tension member 120 from moving to the lower side of the wedge member ( To prevent the detachment of the 210, and when the tension member 120 is tensioned after the insertion of the anchor assembly 100 is completed, as the tension member 120 moves to the head 10 side, the shiatsu steel pipe 111 and the tension member 120 naturally. It is to break away from.

As such, the temporary coupling member 280 is separated from the tension member 120 when the tension member 120 is tensioned, so as not to be disturbed by the recovery operation of the tension member 120 later.

Temporary coupling member 280 for preventing the wedge member detachment is most preferably to take the pointed wedge structure toward the bottom to effectively implement the above function.

Since the above has been described only with respect to some of the preferred embodiments that can be implemented by the present invention, the scope of the present invention, as is well known, should not be construed as limited to the above embodiments, the present invention described above It will be said that both the technical idea and the technical idea which together with the base are included in the scope of the present invention.

1 is a cross-sectional view of a conventional retractable anchor assembly.

Figure 2 below shows an embodiment of a retractable anchor assembly according to the present invention,

2 is a cross-sectional view of the first embodiment.

3 is a sectional view of a second embodiment;

4 is a partial sectional view of a third embodiment.

5 is a partial sectional view of a fourth embodiment.

6 is a perspective view of the fixing plate.

7 is a perspective view of the wedge member.

Figure 8 is a perspective view of the wedge member detachment plate.

9 is an operating state diagram of the fourth embodiment.

10 is a partial sectional view of a fifth embodiment.

11 and 12 show an operating state of the sixth embodiment;

DESCRIPTION OF REFERENCE NUMERALS

100: retractable anchor assembly 110: protective tube

110a: packer mounting portion 111: acupressure steel pipe

120: tension member 200: tension member fixing device

210: wedge member 220: fixing plate

221: through hole tension material 222: wedge member fixing hole

223: wire through hole 224: coupling groove

230: protective cap 231: wire locking member

250: wedge member detachment wire 251: auxiliary plate coupling portion

252: extension portion 260: wedge member detachment auxiliary plate

261: wedge member coupling hole 262: wire through hole

270 wire protection tube 271 protection tube departure preventing member

272: protective tube fixing member

280: temporary coupling member for preventing wedge member detachment

Claims (11)

Tension protection tube 110 is installed so that the grout does not flow into the interior; A tension member 120 inserted into the tension member protection tube 110; Includes; retractable tension fixing device 200 installed on the lower end of the tension member protection tube 110, so as to support and release the lower end of the tension member 120; The recoverable tension fixing device 200 is A wedge member 210 detachably coupled to the lower end of the tension member 120; In addition to being installed at the lower end of the tension protection tube 110, the tension member through hole 221, the wedge member fixing hole 222 and the wire through hole 223 is formed, and prevents the front separation of the tension member 120 A fixing plate 220 to which the wedge member 210 is fixed; A protective cap 230 installed to protect the wedge member 210 and the fixing plate 220 from the grout, and a wire locking member 231 installed at the inner core portion; The wedge member 210 is coupled to the wedge member 210 so that the wedge member 210 is separated to the lower side when the tension member 120 is recovered, and the other end is provided with the wire catching member 231 so that the wire through hole 223 is provided. Wedge member detachment wire 250 is installed to be exposed to the head 10 side through); Retractable anchor assembly (100) comprising. The method of claim 1, The recoverable tension fixing device 200 is It is installed on the lower side of the fixing plate 220, and further provided with a wedge member detachment auxiliary plate 260 having a wedge member coupling hole 261 and a wire through hole 262 in the core portion, The wedge member 210 is coupled to the fixing plate 220 by placing the wedge member detachment plate 260, Retractable anchor assembly 100, characterized in that one end of the wedge member detachment wire 250 is coupled to the wedge member detachment auxiliary plate (260). The method of claim 2, The wedge member detachment wire 250 is A plurality of auxiliary plate coupling parts 251 having one end coupled to an edge of the wedge member detachment auxiliary plate 260; An extension part 252 having one end coupled to the other end of the plurality of auxiliary plate coupling parts 251 and the other end extended to be caught by the wire locking member 231; Retractable anchor assembly, characterized in that it comprises a. The method of claim 1, The recoverable tension fixing device 200 is A through hole of the wedge member detachment wire 250 is formed in a core part, and one end thereof is connected to the wire through hole 223 of the fixing plate 220, and the tension member protection tube is exposed to the other end of the head 10. Retractable anchor assembly (100) characterized in that it further comprises a wire protection tube (270) installed inside (110). 5. The method of claim 4, One end of the wire protection tube 270 is installed to penetrate the wire through hole 223 of the fixing plate 220, and the separation of the protection tube from the outer circumference of the wire protection tube 270 in the inlet region of the wire through hole 223. Retractable anchor assembly (100), characterized in that the member (271) is installed. The method of claim 5, Retractable anchor assembly (100), characterized in that the protective tube fixing member (272) is installed on the outer circumference of the wire protective tube (270) of the wire through hole (223) exit region of the fixing plate (220). The method of claim 1, The tension member protective tube 110 includes a shiatsu steel pipe 111 is installed to have a length corresponding to the anchorage region of the anchor, A lower end of the acupressure steel pipe (111) is a recoverable anchor assembly, characterized in that coupled to the fixing plate (220). The method of claim 7, wherein The upper surface of the fixing plate 220 is formed with a coupling groove 224 for coupling with the acupressure steel pipe 111, the lower end of the acupressure steel pipe 111 is characterized in that the screw coupling to the coupling groove 224. Retractable anchor assembly (100). The method of claim 7, wherein Retractable anchor assembly (100), characterized in that the packer mounting portion (110a) is formed in the upper region of the acupressure steel pipe (111) is a pressure grouting packer (P) is mounted. The method of claim 7, wherein The acupressure steel pipe 111 and the pressure-retaining anchor assembly 100 to maintain the coupled state to prevent the separation of the wedge member 210, as well as to escape during the tension work of the tension member 120, Retractable anchor assembly (100) characterized in that it further comprises a temporary coupling member (280) for preventing wedge member detachment temporarily coupled between the tension member (120). The method of claim 10, The wedge member detachment preventing temporary coupling member 280 is a retractable anchor assembly, characterized in that the pointed wedge structure toward the bottom.

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