KR101039063B1 - 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 tension protection tube 110, the tension member through hole 221 and the wedge member fixing hole 222 is formed in the core, the wedge member 210 is fixed to prevent the upward departure of the tension member 120 A fixing plate 220; Wedge member 210, the protective cap 230 is installed to protect the fixing plate 220 from the grout; Temporary support member 240 temporarily coupled to the wedge member 210 to prevent release of the wedge member 210 prior to the tension of the tension member 120, and to release the coupling with the tension of the tension member 120. By presenting a retractable anchor assembly 100 comprising a, it is easy to remove the tension material, while ensuring a sufficient strength.

Removal, anchor, shiatsu

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 penetrating through the anchor head 1 formed at the bottom of the anchor assembly is buried in the ground in the state of being fixed by a fixing nut (3, a kind of liner screw), and when the tension member is removed, the pressure plate at the front of the anchor assembly. By loosening the tightening nut 5 formed in (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 anchor head 1 at the bottom is fixed by the grout in the perforation hole, and the tension member 2 fixed at the bottom is fixed to the anchor head 1 and fixed to the pressure plate 4 at the front end. It resists earth pressure by the method (tensile method).

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 anchor head 1 to which the lower end of the tension member 2 is coupled is embedded in the grout to resist earth pressure (tension). In this type of anchor, the local destruction between the anchor head 1 and the surrounding grout gradually leads to the destruction of the entire structure of the anchor, which is difficult to expect sufficient strength over a long period of time. have.

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 of the anchor assembly, and the lower end of the anchor assembly is embedded in a high depth of ground, so that the tension member is rotated at the front end of the anchor assembly in order to remove the tension member from the anchor assembly. Or by hitting, the lower end of the tension member should be released from engagement with the lower end of the anchor assembly.

By the way, anchor assembly fixed in the ground drilling hole can not be avoided to some extent by the 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 member protection tube 110, the tension member through hole 221 and the wedge member fixing hole 222 is formed in the core, the wedge member 210 to prevent the upward departure of the tension member 120 Fixing plate 220 is fixed to; A protective cap 230 installed to protect the wedge member 210 and the fixing plate 220 from the grout; Temporary support temporarily coupled to the wedge member 210 to prevent release of the wedge member 210 prior to the tension of the tension member 120 and to release the coupling with the tension of the tension member 120. A member 240 is provided.

The temporary support member 240 preferably includes a support 241 having one end hinged to the bottom core of the protective cap 230 and the other end temporarily coupled to the wedge member 210.

The recoverable tension member fixing device 200 is a wedge release elastic member 250 coupled to the wedge member 210 to assist in the downward separation of the wedge member 210 when the tension member 120 is released. It is preferable to further provide.

The wedge detachment elastic member 250 preferably includes a spring 251 having one end coupled to the bottom core of the protective cap 230 and the other end coupled to the wedge member 210.

The recovery type tension member fixing device 200 has a through-hole 261 of the tension member 120 is formed in the core portion, the fixing plate 260 installed on the lower end of the acupressure steel pipe 111 as the upper side of the fixing plate 220. ); Before the tension of the tension member 120, in order to prevent the downward departure of the wedge member 210 by the wedge release elastic member 250, the fixing plate 220 is coupled to the fixing plate 260 Wedge departure prevention elastic member 270 is installed to press downward; further comprising, the protective cap 230 is preferably coupled to the fixing plate 260 to protect the wedge departure prevention elastic member 270 from the grout. .

The wedge detachment preventing elastic member 270 preferably includes a leaf spring 271 installed so that the protrusion is in surface contact with the front surface 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 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 retractable anchor assembly 100 according to 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 tension protection tube 110, the tension member through-hole 221 and the wedge member fixing hole 222 is formed in the core, the wedge member 210 to prevent the upward departure of the tension member 120 A fixing plate 220 to be fixed; Wedge member 210, the protective cap 230 is installed to protect the fixing plate 220 from the grout; Temporary support member 240 temporarily coupled to the wedge member 210 to prevent release of the wedge member 210 prior to the tension of the tension member 120, and to release the coupling with the tension of the tension member 120. It is configured to include.

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, As the wedge member 210 is separated from the fixing plate 220 by the tension relief of the 120, the tension member 120 may be removed upward.

That is, in the case of removing the tension member 120 after completion of the construction of the main structure, when the coupling of the head 10 and the shear member 120 shear release, the tension member 120 is released to retract the tension, the tension member 120 The wedge member 210 coupled to the lower end is also released to the bar while the coupling with the fixing plate 220 is released, it is possible to remove the tension member 120 upwards.

In the case of applying the structure according to the present embodiment, there is no need to rotate or strike the tension member as in the prior art for the removal of the tension member 120, only by releasing the coupling of the tension member 120 and the head 10. Since the tension member 120 can be removed, it is possible to obtain an effect that the removal of the tension member becomes very easy.

However, in the case of taking such a structure, a problem arises in that the lower end of the tension member 120 and the fixing plate 220 are released due to the wedge member 210 being separated during the insertion of the anchor assembly 100 to the drilling hole. Can be.

In order to prevent this, before the tension of the tension member 120, while preventing the downward departure of the wedge member 210, as well as the release of the coupling with the tension of the tension member 120, the temporary support member (w) It is preferable to take the structure that 240 is temporarily coupled, the driving principle is as follows.

During insertion of the anchor assembly 100 into the drilled hole, the tension member 120 is coupled to the fixing plate 220 together with the wedge member 210 and supported by the temporary support member 240 (FIG. 4).

The temporary support member 240 prevents the coupling of the tension member 120 and the fixing plate 220 by detaching the wedge member 210 downwardly before the tensioning operation of the tension member 120.

When the insertion and grouting operation of the anchor assembly 100 is completed and the tension member 120 is tense, the wedge member 210 moves slightly upward with the tension member 120 to closely adhere to the fixing plate 220, The temporary support member 240 is separated from the wedge member 210 (FIG. 5).

Temporary support member 240 may take any configuration as long as it can achieve the above purpose, in Figures 4 and 5, one end is hinged to the bottom core of the protective cap 230, the other end of the wedge member 210 It illustrates an embodiment implemented by a support 241 temporarily coupled to).

When the removal of the tension member after the completion of the construction of the main structure, the release of the tension member 120 and the head 10 when the tension of the tension member 120 is released, the wedge member 210 is released to the lower side of the fixing plate 220 As a result of the long term coupling, the wedge member 210 may not be separated from the fixing plate 220 despite the tension of the tension member 120.

In order to prevent this, when the tension member 120 is released, it is preferable to take a configuration in which the wedge-elevating elastic member 250 is coupled to the wedge member 210 so as to assist the detachment of the wedge member 210 downwardly. The driving principle is as follows.

During the insertion of the anchor assembly 100, the temporary support member 240 supports the wedge member 210 upwards, so that the wedge member 210 is fixed to the fixing plate 220 despite the elastic force of the wedge detachment elastic member 250. Do not deviate from (Fig. 8).

During the tensioning operation of the tension member 120, the temporary support member 240 is released, but since the tension device pulls the tension member 120 upwards, the wedge member 210 is also pulled upward together from the fixing plate 220 Do not deviate (FIG. 9).

After completion of the construction of the main structure, when the tension member 120 and the head 10 is released, since the force pulling upward the tension member 120 disappears, the wedge member by the elastic force of the wedge release elastic member 250 only 210 is released below the fixing plate 220, the coupling of the lower end of the tension member 120 and the wedge member 210 is released (Fig. 10).

Therefore, when taking the structure according to the present embodiment, there is an effect that the phenomenon that the wedge member 210 is in close contact with the fixing plate 220 does not fall during the removal of the tension material can be reliably prevented.

Here, the wedge detachment elastic member 250 may be any structure as long as the wedge member 210 can be driven downward by the above principle, and one end of the bottom surface of the protective cap 230 is shown in FIGS. It is shown in the example implemented by the spring 251 coupled to, the other end is coupled to the wedge member (210).

In the case of the structure in which the wedge-elevating elastic member 250 is applied, during the period between the insertion work of the anchor assembly 100 (FIG. 8) and the tension work of the tension member 120 (FIG. 9), the temporary support member 240 is provided. Is separated, but as a sufficient tension force is not applied to the tension member 120, a situation in which the wedge member 210 is separated below the fixing plate 220 by the elastic force of the wedge-releasing elastic member 250 may occur. It may also be (FIG. 10).

This causes the problem that the anchor assembly 100 must be rebuilt, as the tensioning work on the tension member 120 is inherently impossible.

In order to surely prevent this, the through hole 261 of the tension member 120 is formed in the core portion, the fixing plate 260 which is installed on the lower end of the acupressure steel pipe 111 as an upper portion of the fixing plate 220; Before the tension of the tension member 120, in order to prevent the downward departure of the wedge member 210 by the wedge release elastic member 250, the fixing plate 260 is installed so as to press the fixing plate 220 downward It is preferable to take the structure further provided; the driving principle is as follows.

After inserting the anchor assembly 100 into the drilling hole, before the tensioning of the tension member 120, the fixing plate 220 is pushed downward from the fixing plate 260 by the elastic force of the elastic member 270 for preventing wedge release. Therefore, the temporary support member 240 does not detach from the wedge member 210 (FIG. 11).

When the tension work of the tension member 120 is started and sufficient tension force is applied to the tension member 120, the fixing plate 220 is fixed to the fixing plate 260 side (upward) as the elastic member 270 for preventing wedge release is compressed. When driven, the wedge member 210 is coupled to the fixing plate 220 by a sufficient force together with the tension member 120, even if the temporary support member 240 is separated from the wedge member 210 elastic for wedge In spite of the elastic force of the member 250, the wedge member 210 does not escape downward (FIG. 12).

To this end, the elastic force of the wedge departure prevention elastic member 270 should be larger than the elastic force of the wedge departure elastic member 250, all of these forces must be smaller than the tension force applied to the tension member 120.

Since the fixing plate 260 and the fixing plate 220 are not separated from each other, and must be coupled so that the mutual spacing is changeable by the elastic member 270 for preventing wedge detachment, the flexible material as shown in FIGS. 10 and 11. What is necessary is just to couple | bond by the coupling tool 262 by (thread etc.).

In this case, the protective cap 230 preferably takes a structure coupled to the fixing plate 260 to protect the wedge departure preventing elastic member 270 from the grout.

The wedge detachment preventing elastic member 270 may have any structure as long as it can maintain a gap between the fixing plate 260 and the fixing plate 220 according to the above principle, and the protrusions of the fixing plate 220 are illustrated in FIGS. 11 and 12. It shows an example implemented by the leaf spring 271 installed in surface contact with the front of the).

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 charge direction (the longitudinal direction of the tension member) but also the compressive force on the side of the perforated hole. Compressive strength) can be much greater strength.

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 tube 111 In itself, as a reinforcement, 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 recovery of the tension member 120 The added advantage of ease of operation is added.

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.

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 and 5 are operating states of the second embodiment;

6 is a perspective view of the fixing plate.

7 is a perspective view of the wedge member.

8 to 10 are operating states of the third embodiment.

11 and 12 show an operating state of the fourth embodiment.

DESCRIPTION OF REFERENCE NUMERALS

100: retractable anchor assembly 110: protective tube

110a: pack mounting portion 111: acupressure steel pipe

120: tension member 200: recovery tension member fixing device

210: wedge member 220: fixing plate

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

230: protective cap 240: temporary support member

241: support 250: elastic member for wedge release

251: spring 260: fixed plate

261: through hole tension material 270: elastic member for preventing wedge departure

271: leaf spring

Claims (9)

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 member protection tube 110, the tension member through hole 221 and the wedge member fixing hole 222 is formed in the core, the wedge member 210 to prevent the upward departure of the tension member 120 Fixing plate 220 is fixed to; A protective cap 230 installed to protect the wedge member 210 and the fixing plate 220 from the grout; Temporary support temporarily coupled to the wedge member 210 to prevent release of the wedge member 210 prior to the tension of the tension member 120 and to release the coupling with the tension of the tension member 120. Member 240; Retractable anchor assembly (100) comprising. The method of claim 1, The temporary support member 240 is Retractable anchor assembly (100) characterized in that one end is hinged to the bottom core of the protective cap 230, the other end includes a support (241) temporarily coupled to the wedge member (210). The method of claim 1, The recoverable tension fixing device 200 is Retractable anchor, characterized in that it further comprises a wedge release elastic member 250 coupled to the wedge member 210 to assist in the downward release of the wedge member 210 when the tension member 120 is released. Assembly 100. The method of claim 3, wherein The wedge detachment elastic member 250 is Retractable anchor assembly (100) characterized in that one end is coupled to the bottom core of the protective cap 230, the other end is coupled to the wedge member (210). The method of claim 1, The recoverable tension fixing device 200 is The through hole 261 of the tension member 120 is formed in the core portion, and the fixing plate 260 is installed on the lower end of the acupressure steel pipe 111 as an upper portion of the fixing plate 220; Before the tension of the tension member 120, in order to prevent the downward departure of the wedge member 210 by the wedge release elastic member 250, the fixing plate 220 is coupled to the fixing plate 260 Further provided with an elastic member for preventing wedge detachment 270 is installed to press downward, The protective cap 230 is a retractable anchor assembly (100), characterized in that coupled to the fixing plate 260 to protect the wedge escape preventing elastic member (270) from the grout. The method of claim 5, The wedge departure preventing elastic member 270 is Retractable anchor assembly (100) characterized in that it comprises a leaf spring (271) protruding portion is installed in surface contact with the front surface 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.

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