JPH10176328A - Removal anchor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify extraction and collection work and to reduce cost by extending a core material from a center of an extending tool, installing a drawing guide tool and separating a hardening material as mortar, etc., attached on a tension member by the guide tool. SOLUTION: A hardening material of mortar, etc., in the circumference is broken by a wedge type extending tool 5 while extracting a core material 1 at first at the time of collecting an anchor A buried under ground and fixed by filling mortar, etc., in the circumference by extracting it after it is used. Simultaneously at the time of extracting this core material 1, the hardening material attached on a tension member 2 is separated by a drawing guide tool 6 having a through hole 7 and furnished with a knife-edge part 11 which is fastened on the core material 1. Thereafter, when extraction of the core material 1 is finished, the tension member 2 is extracted and collected. Consequently, it is possible to easily and certainly extract a cable anchor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a removal anchor that can be pulled out of the ground and collected when it is no longer needed after being constructed in the ground.

[0002]

2. Description of the Related Art Conventionally, as a removal anchor, when it is no longer necessary after constructing an anchor, a core material is extracted together with an expanded material (wedge material) fixed to the tip, and is arranged around the core material with the extraction. While removing and expanding the multiple tension members, the surrounding hardening material (mortar) is destroyed, and the tension material is free from the adhesion with the hardening material, and the removal anchor that allows the pulling material to be pulled out and collected It has been proposed (for example, see Japanese Patent Publication No. 56-11006).

[0003]

However, in the case where the hardened material is simply destroyed by expansion, for example, when a wedge-shaped dilator is withdrawn, as in the case of the removal anchor having the above structure, one of the broken hardened materials is used. The part remains attached to the pulling material, and even if the pulling material cannot be pulled out or it can be pulled out, a large force is required for pulling out, and it is essential to apply a pulling device such as a hydraulic jack And other problems.

In order to solve such a problem, it has been proposed to provide a shrinkable space in the hardening material so that the hardening material can be moved and crushed by pressure (for example, see Japanese Patent Application Laid-Open No. 5-263423). .

[0005] The removal anchor of the method of providing a contractible space,
May be able to help the hardener break down,
Not only does the fear that some of the hardened material adhere to the tensile material remains, but it also requires the use of a large amount of shrinkable material in order to provide a shrinkable space, which results in a large amount of use of the shrinkable material and the need for installation work. There was a problem that the construction cost was soared due to trouble.

[0006] The present invention has been made to solve the above-mentioned conventional problems.

[0007]

According to the present invention, in a state in which an anchor is constructed, a core material is extracted to the ground together with an expansion tool fixed to a distal end portion, and is disposed around the core material with the extraction. In the removal anchor that makes the tension material free from the adhesion of the hardening material by destroying the surrounding hardening material while pushing and expanding the multiple pulling materials,
The core extends forward from the center of the expander, and the puller extends under the radially expanded condition around the expander and extends forward, extending to the tip of the core extension A pulling guide tool is fixed at the center at a distance from the tool,
The pulling guide device has a through hole in the peripheral portion, and in the through hole, the extending portion of the pulling material is freely penetrated while being drawn toward the radial center from the expanded state, and the outer diameter of the pulling guide device is The removal anchor is characterized in that it is set to be smaller than the outer diameter of the expanded portion of the tension member.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows the fixing state of the removal anchor of the present invention. In the figure, A indicates the removal anchor of the present invention, B indicates a hardening material such as cement mortar constituting an anchor trunk, and C indicates a hole.

FIG. 2 shows a removal anchor A according to the present invention. The removal anchor A is provided with a free length portion A ₁ , a fixing length portion A ₂ , an extension portion A ₃ and a pulling guide portion A ₄ in order from the base end side. I have.

The free length portion A ₁ is a portion which is free from the adhesion with the hardening material B. As shown in FIG. 3, the core material 1 and a plurality of, for example, eight tension members 2 disposed around the core material 1. Are provided with sheaths 3 and 4, and the sheaths 3 and 4 isolate the adhesive from the hardening material B.

The fixing length portion A ₂ is a portion constituting a fixing portion by adhesion to the hardening material B. As shown in FIG. 4, the core material 1 is isolated from the adhesion to the hardening material B by the sheath 3. However, the sheath is peeled off and removed from the tensile member 2 around it, so that each of the tensile members 2 directly adheres to the hardening material B to form a fixing portion.

[0012] extension A ₃ is a portion of installing the dilator 5, as shown in FIG. 2, on the core 1 at the mounting hole 5b dilator 5 is centered in the state removing the sheath mounting It is fixed and has a wedge portion 5a on the base end side. The tension member 2 disposed around the core member 1 is expanded outward around the dilator 5, and further extends forward under this expanded state.

[0013] attracted a partial guide section A ₄ is to place the guide member 6 drawn, as shown in FIG. 2, mounting holes attracted guide member 6 is central shape similar circular or thereto on core 1 6a. The outer diameter of the guide member 6 is smaller than the maximum outer diameter of the extended portion A ₃ of the tension member 2, the peripheral portion a plurality of through holes 7 is provided ,, the through the hole 7 of the tension member 2 Extension 2
a are freely inserted while being drawn toward the center.

The insertion of the tension member 2 into the through hole 7 is shown in FIG.
As shown in FIG. 6, the same number of through holes 7 as the number of pull members 2 may be provided, and one of the pull members 2 may be inserted into each of the through holes 7, or a plurality of pull members 2 such as two (see FIG. 6) or 4 Books (see FIG. 7) may be inserted as a set.

As shown in FIG. 2, a space is formed between the expansion tool 5 and the pulling guide tool 6, and at this space a, the degree of expansion of the tension member 2 is gradually increased toward the distal end. is decreasing.

At the interval a, a gap 8 is formed between the tension members 2 due to expansion, and a hardening material such as cement and mortar may enter the gap 8 and harden when the anchor is constructed. Therefore, such means for preventing the penetration of the hardening material are provided. The figure shows a case where a cap 9 is provided as an intrusion prevention means.

Incidentally, between the space portions a, it is assumed that the tension member 2
Even if the hardening material B adheres, the attached portion can be separated by moving the pulling guide 6, so that the application of the hardening material intrusion prevention means may be omitted in some cases.

The gap 8 may be filled with a sliding material 10 such as grease in order to improve the sliding property of the pulling tool 6. The filling of the sliding material 10 may be used also as a hardening material intrusion prevention means.

The outer peripheral portion of the base end surface side of the pulling guide member 6, that is, the surface that becomes the front surface at the time of pulling out, constitutes a cutting edge portion 11 which is effective in separating the attached portion between the tension member 2 and the hardening material B. .

FIG. 8 shows the fixing state of the removal anchor A of the present invention, and FIG. 9 shows the state at the time of the removal operation of the anchor A.

When the drawing of the core 1 is started from the fixing state shown in FIG. 8 by applying a drawing device such as a hydraulic jack (not shown), as shown in FIG. The movement of the tool 5 causes the surrounding tensile material 2 and the hardening material B to expand outward, and the expansion causes the surrounding hardening material B to break.

[0022] Figure 10 shows a cross-sectional structure in the dilator 5 position in Figure 9 in an exaggerated schematic diagrammatically, cured material B with is destroyed by expansion, with the hole wall C ₁ of drilling C becomes compacted state between and pore walls C ₁ is slightly pushed widened diameter as shown in FIG. 9 becomes larger trend. When the hardened material B is broken, the tension member 2 is also expanded and the mutual interval is widened, so that the expansion at the peripheral side portion P ₁ (see FIG. 10) of the tension member 2 is released from the adhesion with the hardened material in the broken state. Although it tends, the outer end side P ₂ facing the hole wall C ₁ (see FIG. 10)
In this case, it tends to be pressed against the hardening material B, and the adhesion state tends to remain.

FIG. 11 schematically shows an exaggerated cross-sectional structure between the expansion tool 5 and the pulling guide tool 6 in FIG. 9. In this portion, the tension member 2 has a degree of expansion gradually. Since it has decreased, the hardening material B is released from the consolidation state and loosened accordingly. The state of the loose portion 12 is represented by a blank in FIGS.

As shown in FIG. 9, on the rear side of the expansion tool 5, the pulling guide tool 6 moves along the pulling member 2 with an interval and passes through the slack portion 12.

The pulling guide 6 moves along the pulling member 2 while pulling the pulling member 2 from the expanded state toward the center in the radial direction, and during this movement, the pulling member 2 is moved.
While forcibly separating between the (mainly outer end side P ₂ ) and the hardened material 2 still attached, the separated hardened material B is pushed again toward the hole wall C ₁ by using the looseness. .

FIG. 12 schematically shows an exaggerated cross-sectional structure of the pulling member 6 and the hardening material B after passing through the pulling tool 6.
And is completely separated. In the drawing, this separated state is represented by a blank 13 for convenience.

By continuing to pull out the core material 1 as described above, the tension member 2 can be completely separated from the hardened material B, and the tension member 2 is completely free from the hardened material B. Can be pulled out and collected

[0028]

According to the present invention, the tension member 2 can be forcibly cut off from the hardened material in the broken state by the pulling guide after the hardened material is expanded and broken by the expansion tool. The pulling-out can be performed in a state where the pulling-out material is completely free from the material, and the pulling-out material can be easily pulled out and collected stably and reliably.

Further, since it is not necessary to use a shrinkable material as seen in the conventional product, it is possible to simplify the pull-out and recovery of such a tensile material without increasing the burden of construction costs.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing a fixing state of a removal anchor of the present invention.

FIG. 2 is a longitudinal sectional view of the removal anchor of the present invention.

FIG. 3 is a cross-sectional view of a free length portion of FIG.

FIG. 4 is a cross-sectional view of the fixing length portion.

FIG. 5 is a sectional view of the pulling guide portion.

FIG. 6 is a sectional view showing a modification of FIG. 5;

FIG. 7 is a cross-sectional view showing another modification.

FIG. 8 is a detailed view of a main part showing a fixing state of the removal anchor of the present invention.

FIG. 9 is an explanatory view of the removal principle of the removal anchor of the present invention.

FIG. 10 is a longitudinal sectional view of the extension part of FIG. 9;

FIG. 11 is a longitudinal sectional view of the slack portion.

FIG. 12 is a longitudinal sectional view showing the situation after passing through the pulling guide device.

[Explanation of symbols]

A present invention removes the anchor A ₁ free length portion A ₂ fixing length portion A ₃ extension A ₄ drawn guide part B cured material C boring 1 core member 2 tension material 3 the sheath 4 sheath 5 expander 5a wedge 5b mounting holes 6 Attraction guide tool 6a Mounting hole 7 Through hole 8 Gap 9 Cap 10 Slip material 11 Blade edge 12 Blank 13 Blank

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshimitsu Hirabe 3-2-26 Nishishinjuku, Shinjuku-ku, Tokyo Inside VSL Japan Co., Ltd. (72) Inventor Yasuo Miyazaki Higashisei, Osaka-shi, Osaka (72) Inventor Masaaki Ohinata 3-3-20 Kikyogaoka Minami, Nabari City, Mie Prefecture (72) Inventor Hirohisa Tanimuro 448-5 Hagiwaracho, Ikoma City, Nara Prefecture

Claims (5)

[Claims] In an anchor construction state, a core material is pulled out toward the ground together with an extension tool fixed to a tip portion, and a plurality of pulling members arranged around the core material are pushed and spread as the core material is pulled out. While removing the hardening material around it, the tension material is free from the adhesion of the hardening material, and in the removal anchor, the core material extends forward from the center of the expansion device, and the tension material is the expansion material , Which extends under the radially expanded state and extends forward, and a pulling guide is fixed at the center of the extension of the core material at the center with a distance from the extension. The pulling guide has a through hole in the peripheral portion, and the extension of the pulling material is freely penetrated from the expanded state toward the radial center in the through hole, and the pulling guide is outside the pulling guide. The diameter is the outside diameter of the extension of the tension material Removing the anchor, characterized in that it is also set small. 2. Between the expanded portion of the tension member and the tip,
2. The removal anchor according to claim 1, further comprising means for isolating from the hardening material. 3. The removal anchor according to claim 2, wherein the separating means is a cap provided between the expanded portion and the tip of the tension member. 4. The removal anchor according to claim 1, wherein a gap between the tension members in the expanded state is filled with a sliding material such as grease. 5. The removal anchor according to claim 1, wherein the pulling guide has a cutting edge on the base end face side for separating an attachment portion between the tension member and the hardening material. .