JPH06128951A - Anchor - Google Patents

Abstract

PURPOSE:To make it possible to prevent the generation of hazards of elimination work, vibration and noise in terms of an anchor capable of removing a tensile material with a separation means. CONSTITUTION:In terms of an anchor where a plurality of tensile materials 2 are mounted around a temporarily buried body 1 while an anchor skeleton A formed by fixing a hardening material 3 is constructed in a excavated hole, The temporarily buried body 1 comprises a core rope and an outer layer rope formed with twisted synthetic fiber and wound up around the core rope. The tensile materials 2 are arranged in such a fashion that they may be unevenly distributed around a part of the temporarily buried body 1 and they may adjoin each other face to face.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor capable of removing a tensile member by peeling means.

[0002]

2. Description of the Related Art An anchor is used as a support base for various purposes such as when building a building, but it can be easily removed after use because it may interfere with other work. Is desired. This requirement is particularly strong for tensile materials protruding from the ground.

Therefore, it is expected to develop means for removing at least the tensile material easily. Therefore, as a conventional method for removing the tensile member, as disclosed in, for example, Japanese Patent Publication No. 51-8251, Japanese Patent Publication No. 54-22007, etc., hollows are preliminarily formed in the anchors, or the anchors are subsequently formed. A hollow hole is formed in the hollow member, and means for splitting the anchor by a gunpowder or the like is provided. By this splitting member, the fixing force for the tensile member is reduced and the tensile member is pulled out and removed.

However, this conventional means has a problem that the removal work is accompanied by danger and that vibration and noise are generated. Therefore, the present applicant has proposed a removing means to solve such a problem (Japanese Patent Application No. 59-248).
328).

That is, FIGS. 10 to 12 show the proposal of the present applicant, in which the anchor is composed of the anchor trunk A built in the drilling hole H dug in the ground E, and the anchor trunk As shown in FIG. 11, A is a temporary embedding body 1 such as a synthetic fiber rope, and a plurality of tension members (for example, steel rods and steel wires) 2 attached at equal intervals around the temporary embedding body 1, Tensile material 2
And a curable material (for example, cement paste made of early-strength cement or the like) that is cast to fix the cement.

The temporary embedding body 1 such as a synthetic fiber rope expands and contracts its diameter when a tensile force is applied, so that the temporary embedding body 1 can be easily pulled out and removed. After the removal, a cavity 4 is formed in the anchor trunk A. Is formed.

Around the cavity 4, the tension member 2 is provided.
As shown in FIG. 10, when the tension member 2 is inserted into the push tube 5 having a diameter slightly smaller than the cavity 4 and the push tube 5 is pushed in, the tension material 2 is inserted into the push tube 5. It is narrowed down and separated from the curable material 3.

Thus, in the anchor trunk body A after the tensile material 2 is peeled and removed, as shown in FIG. 12, a hollow portion is formed in the curable material 3. As described above, according to the present applicant's proposal, it is possible to sufficiently achieve the prevention of the risk of the removal work and the prevention of vibration and noise.

[0009]

However, according to this applicant's previous proposal, when the peeling piece 6 of the curable material 3 caused by peeling of the tensile material 2 is deposited in the cavity 4, the above-mentioned tensile material 2 is removed. It may be difficult to narrow down the push pipe 5, and the tensile member 2 may not be completely peeled off.

Further, since a plurality of tension members 2 are peeled off at the same time, a considerably strong force is required to push the push tube 5. The present invention has been made by improving the existing proposal of the present applicant, and an object thereof is to provide an anchor capable of easily and completely removing a tensile member.

[0011]

According to a first aspect of the present invention, a plurality of tension members are attached to the periphery of a temporary embedding body and an anchor trunk body formed by fixing with a curable material is built in a forming hole. In the anchor consisting of, the temporary buried body, a core rope,
An outer layer rope formed by twisting synthetic fibers and wound around the outer periphery of a core rope. Tensile members are arranged adjacent to each other so as to be unevenly distributed in a part of the periphery of this temporary embedding body and contact each other.

According to a second aspect of the present invention, a spacer is attached to the outside of the tension member to maintain a gap between the tension member and the periphery of the forming hole.

[0013]

According to the first and second aspects of the invention, when the temporary buried body is removed, the contact area between the tensile material and the curable material is extremely reduced,
The fixing force of the tension material decreases. After that, when at least one tensile member is removed by an appropriate means, the supporting force of the removed tensile member with respect to the adjacent tensile member is lost, so that the fixing force is lowered. Therefore, by removing one piece of tension material, the remaining tension material can be removed by simple pulling.

[0014]

Embodiments of the anchor according to the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of an anchor according to the present invention, in which a cross section of an anchor trunk A is shown.

The anchor trunk A comprises a temporary embedding body 1, a tensile member 2 and a curable material 3. The tensile member 2 is the temporary buried body 1.
The tensile members 2 are arranged so as to be adjacent to each other in a part of the periphery of the above so as to be unevenly distributed.

The temporary buried body 1 includes a core rope 1a,
The outer rope 1b is formed by twisting synthetic fibers 1b 'and is wound around the outer circumference of the core rope 1a. The core rope 1a is composed of a synthetic fiber rope 1a 'and a resin coating 1a "covering the synthetic fiber rope 1a'.

In the present embodiment, the outer layer rope 1b formed by twisting the synthetic fibers 1b 'is impregnated with the curable material 3 to improve the fixing force of the temporary embedding body 1 and the adjacent arrangement. Therefore, there is an advantage that the fixing force of the tensile member 2 whose contact area with the curable material 3 is reduced is also improved.

Therefore, in order to accelerate the impregnation of the curable material 3, it is preferable to use a milk-like curable material 3. Also, a core rope 1a having a resin coating 1a "
Slides with respect to the outer rope 1b, so that the core rope 1a can be easily pulled out and removed.
Since the cavity 4 is formed after the removal of a, there is an advantage that the outer layer rope 1b impregnated with the curable material 3 can be easily pulled out and removed.

As described above, the anchor according to this embodiment is
Although it has an extremely strong fixing force and can be used as various supporting bases, when the temporary embedding body 1 is removed, the contact area between the tensile member 2 and the curable material 3 is extremely reduced as shown in FIG. The fixing power of 2 decreases.

Further, as shown in FIG. 7, the tension members 2 are arranged.
, 2g, if the tensile material 2a is removed, the tensile material 2b is removed, and if the tensile material 2d is removed, the tensile materials 2c and 2e are further reduced in fixing force. I will let you.

That is, if at least one of the tension members 2 is removed by an appropriate means, the supporting force of the removed tension members 2 with respect to the adjacent tension members 2 is lost, so that the fixing force is lowered. .

Therefore, the fixing force of the first tension member 2 to be removed first is also low because it is reduced as described above, but the removal of one tension member 2 makes the remaining tension members 2 simple. It can be removed by simple pulling.

FIG. 2 shows an embodiment in which, in addition to the embodiment of FIG. 1, a spacer 7 for holding a gap between the tension member 2 and the periphery of the forming hole H is attached to the outside thereof. In the drawing,
The spacer 7 has a cylindrical shape, and is attached to the tension member 2 with a binding wire 8 made of annealed steel wire that binds the temporary embedding body 1 and the tension member 2. The purpose of attaching the spacer 7 is a curable material. Since it is intended to prevent the tension member 2 from coming into contact with the periphery of the forming hole H and lowering the fixing force of the tension member 2 at the time of placing 3, the other shapes and other mounting structures are used. It does not matter.

FIG. 3 shows a cross section along the axial direction of the anchor trunk A of the embodiment shown in FIG. Also in this embodiment, the same effect as that of the above embodiment can be obtained.

FIGS. 4 and 5 show an example of a method for removing the tension member in the anchor according to the present invention. FIG. 4 shows a state in which the temporary embedding body 1 has been removed, and FIG. The state of the first removing means is shown in which the push tube 9 is pushed along the material 2.

Here, the push pipe 9 has an inner diameter that is the same as or slightly larger than the diameter of the tension member 2, and the push pipe 9 is inserted into the tension member 2 and pushed. 6 shows details of the push-in state of the push pipe 9 of FIG. 5, one end of which is fixed to the tension member 2 using the jack 10 and the other end of which is fixed to the push pipe 9 so that the jack 10 and the pulling member 9 are pulled. The push tube 9 is pushed in by using the fixing portion 10a for fixing the material 2 as a reaction force receiving member.

Push tube 9 pushed by jack 10
Travels along the tensile material 2 and the tensile material 2 and the curable material 3
The tensile member 2 is peeled off by cutting into the joint surface with and. The stress of this pushing causes the tension member 2 to bend slightly ahead of the push tube 9 and bends the tension member 2 to escape to the cavity 4 side.
Therefore, the push tube 9 passes through the dummy cavity 4 ′ formed by peeling off the tension material 2, and the jack 10 is not required to have a very strong pushing force. Further, since the push pipe 9 is pushed along the tensile member 2, the presence of the peeling pieces 6 accumulated in the cavity 4 does not hinder the progress of the push pipe 9 and completely peels the tensile member 2. be able to.

The push-in tube 9 can be pushed into the two or more push-in tubes 9 at the same time by using one jack 10. By removing at least one tensile member 2 in this manner, the remaining tensile members 2 can be easily removed as the second removing means as described above.

Further, according to this construction example, as shown in FIG. 8, the four tensile members 2a, 2c, 2e, and 2g are removed by using the push pipe 9, and the tensile members are as shown in FIG. 2a, 2
In the case where 3 pieces of d and 2 g were removed using the push tube 9, the remaining tension members 2 could be removed with a jack or the like.

[0030]

As described above, according to the anchor of the present invention, when it is used as a support base, it has a strong fixing force, and when the tensile member is removed, the fixing force can be obtained only by removing the temporary embedding body. Is extremely reduced, and the removal of at least one tensile member makes it easier to remove the remaining tensile members, so that the tensile members can be easily removed.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an anchor according to the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the anchor according to the present invention.

3 is a cross-sectional view taken along the axial direction of the anchor shown in FIG.

FIG. 4 is a cross-sectional view showing an anchor according to the present invention.

FIG. 5 is a cross-sectional view showing an example of a method of removing a tensile member in the anchor according to the present invention.

FIG. 6 is an enlarged view of a main part of FIG.

FIG. 7 is a plan view of the anchor trunk body showing a state in which the temporary buried body is removed.

FIG. 8 is a plan view showing a state in which a part of the tension member of the anchor trunk body in FIG. 7 is removed.

9 is a plan view showing a state where a part of the tension member of the anchor trunk body in FIG. 7 is removed.

FIG. 10 is a cross-sectional view showing a conventional example.

11 is an enlarged plan view of the anchor trunk body before removal of the tensile member of FIG.

12 is an enlarged plan view of the anchor trunk body after removal of the tensile member of FIG.

[Explanation of symbols]

 1 Temporary buried body 2 Tensile material 3 Curable material 4 Cavity 7 Spacer A Anchor trunk E E Ground H Creation hole

Claims (2)

[Claims] 1. An anchor formed by attaching a plurality of tensile members to the periphery of a temporary embedding body and fixing the anchor trunk body with a curable material in a forming hole, wherein the temporary embedding is performed. The body is composed of a core rope and an outer layer rope that is formed by twisting synthetic fibers and is wound around the outer circumference of the core rope. Anchor characterized by being arranged adjacently. 2. The anchor according to claim 1, wherein a spacer is attached to the outside of the tensile member so as to maintain a gap between the tensile member and the periphery of the forming hole.