JPH0346609B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for removing anchor tensile material. More specifically, the present invention relates to an improvement in the method of removing tensile material using a peeling means.

[Conventional technology]

Anchors are used as various support bases when constructing buildings, etc., but if they are left unattended, they can become a hindrance to other work, so it is desirable to be able to easily remove them when unnecessary. This requirement is particularly strong for anchor tension members that protrude from the ground.

Therefore, it is expected to develop a means that can easily remove at least the anchor tension member when unnecessary.

[Problem that the invention seeks to solve]

Conventionally, a method has been used to pull out the tensile material by weakening the fixing force of the curable material to which the tensile material is fixed (for example, Japanese Patent Publication No. 51-8251,
(See Publication No. 54-22007).

However, in these conventional methods, gunpowder or the like is used to split the curable material in order to weaken its adhesion, but the removal work is dangerous and also generates vibrations and noise. There is a problem with doing so.

Therefore, the present applicant has proposed a new method for removing the anchor tensile material that solves these problems (Japanese Patent Application No. 59-248328 (Japanese Unexamined Patent Publication No. 61-146917)).

The method according to this earlier application is shown in FIG.
An anchor trunk formed by inserting a temporary burial body made of synthetic fiber rope etc. and a plurality of tension members 2 attached around it into a preparation hole 1 dug in the ground E, and casting a hardening material 3. After the temporary buried body is pulled out and removed from body A to form a cavity 4, the plurality of tension members 2 are placed in a push pipe 5 having a smaller diameter than the diameter of this cavity 4.
By inserting the push tube 5 through the tensile material 2 and pushing the push tube 5 along the tensile material 2, the tensile material 2 is peeled from the curable material 3 toward the cavity 4 side.

However, in the method related to this prior application, by pushing the push pipe 5 using jacks, safety of the removal work is ensured and vibrations and noise are prevented from occurring, but the Since the peeled pieces 6 of the curable material 3 accumulate in the cavity 4, it may be difficult to push the push tube 5 to the tip of the tensile material 2, making it difficult to completely peel off the tensile material 2. For this reason, it may be necessary to apply a pulling force to the tension member 2 at the final stage of the removal work, and there is a problem in workability that should be improved.

[Purpose of the invention]

The present invention has been made in view of the workability of the method proposed by the applicant, and its purpose is to:
The object of the present invention is to prevent the accumulation of peeled pieces of curable material from becoming an obstacle to peeling off the tensile material, and to improve the workability of removal work by making it possible to completely peel off the tensile material.

[Means for solving problems]

In order to achieve this objective, the anchor tensile material removal method according to the present invention involves inserting a plurality of anchor tensile materials attached around a temporary buried body into a created hole and casting a hardenable material. An anchor tensile material removal method in which a temporary buried body is pulled out and removed from the anchor body to form a cavity inside, and then the tensile material is peeled from the curable material toward the cavity side. A push tube having an inner diameter slightly larger than that of the tension member is inserted into the tension material, and the tension material is peeled off by pushing the push tube along the tension material.

[Action of the invention]

In the present invention, when a push pipe having an inner diameter that is the same as or slightly larger than the diameter of the tension member is inserted into the tension member, and the push pipe is pushed along the tension member, the hardening caused by the peeling of the tension member The peeled piece of material is pushed out of the push tube without interfering with the pushing of the push tube.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for removing an anchor tension member according to the present invention will be described below with reference to FIGS. 1 to 5.

The present invention is similar to the method previously proposed by the applicant mentioned above in that the pushing pipe 7 is pushed along the tensile material 2, but the structure of the pushing pipe 7 is different, and
The figure shows the push tube 7 in its pushed state. The push tube 7 has an inner diameter that is the same as or slightly larger than the diameter of the tension member 2, and is fitted into each tension member 2, respectively.

Fig. 2 shows an embodiment of the means for pushing the push pipe 7, in which one end is fixed to the tension member 2 using a jack 8 to serve as a reaction force receiver, and the other end is fixed to the push pipe 7 and pushed in. It's becoming like that. Wedge-shaped sockets 9 and 10 are attached to the fixed parts 8a and 8b between the jack 8, the tension member 2, and the push pipe 7, respectively, to prevent the fixed parts 8a and 8b from loosening or sliding. A structure has been adopted. When the jack 8 is operated and the push tube 7 is pushed in, the push tube 7 cuts into the joint surface between the tensile material 2 and the curable material 3, and the tensile material 2
is peeled off from the curable material 3. The peeled tensile material 2 curves toward the cavity 4 slightly ahead of the tip of the push tube 7 to relieve the stress of peeling, so that the peeling action is accelerated. And the third
As shown in the figure, a part of the push tube 7 will be located in the dummy cavity 4' from which the tensile material 2 has been peeled off.
The jack 8 does not require much pushing force.
In addition, since the inner diameter of the push tube 7 is the same as or slightly larger than the diameter of the tensile material 2, the curable material 3
Even if the peeled pieces 6 accumulate, there is no problem in pushing the pusher tube 7, and pushing the pusher tube 7 along the tension member 2 is ensured.

4 and 5 show plane views of the anchor body A before and after using the present invention.

In FIG. 4, the anchor trunk body A is attached to the temporary buried body 11 in the center and the 6 anchor bodies attached at equal intervals around it.
Book tensile material 2a, 2b, 2c, 2d, 2e, 2f
, temporary buried body 11, tensile materials 2a, 2b, 2c, 2
It is shown that it is formed from a curable material 3 to which d, 2e, and 2f are fixed. Here, for example, a polyethylene-based synthetic fiber rope is used as the temporary buried body 11, and by applying a tensile force, the rope can be contracted to facilitate pulling out and removal. damage can be prevented. As the tensile material 2, for example, a steel rod, a steel wire, etc. can be used, and the tensile material 2 is appropriately selected depending on the properties of the hardenable material 3. As the hardenable material 3, for example, a cement paste made of early strength cement is used.
be selected as appropriate.

FIG. 5 shows a state in which the temporary buried body 11 is pulled out and removed from such an anchor trunk body A to form a cavity 4, and then one tension member 2a is peeled off and removed.

In addition, in the above embodiment, the case where the treatment is carried out for each tensile material was explained, but the tensile material 2a, 2
It is also possible to insert push tubes 7 into at least two or more of b, 2c, 2d, 2e, and 2f, respectively, and push these push tubes 7 in at the same time with the same jack 8. By using such a jack 8, it is possible to shorten the removal work time.

6 and 7 show other examples of temporary burial bodies used in the method of the present invention, and in the figures, reference numeral 13 indicates a tube made of polyethylene, for example. The outer periphery and tip of the tube 13 are covered with a foam material 14 such as foamed polyethylene. Inside the tube 13 is a hardening material 15 made of cement milk, mortar, etc.
A pull-out member 16 made of, for example, steel is embedded in the hardenable material 15 with one end protruding upward.

In such a temporary burial body, when the pull-out member 16 is pulled upward, the tube 13 and the curable material 15 are pulled out together with the pull-out member 16 because the tube 13 and the anchor body A are separated by the foam material 14. It is easily pulled upward and a cavity is formed in this part.

In the temporary burial body configured as above, the tube 13 is filled with the curable material 15;
The tensile strength of the tensile material 2 before the temporary buried body is pulled out can be made very large.

FIG. 8 shows still another example of the temporary burial body used in the method of the present invention, and in the figure, reference numeral 17 is shown.
indicates an expandable and deflated tube made of polyethylene, for example. The lower end of the tube 17 is sealed by a stopper 18, and a valve mechanism including a valve 20 used for supplying and discharging pressurized fluid is arranged in an opening 19 formed at the upper end. The tube 17 is filled with pressurized water 22 supplied by a pressurized water pump (not shown), and the valve 20 is closed in this state.

In such a temporary burial body, when the valve 20 is opened, the pressurized water inside the tube 17 flows out and the tube 17 contracts, so that the tube 17 can be easily pulled upward.

In the temporary burial body configured as described above, the valve 20
Since the temporarily buried object can be pulled out simply by opening, work efficiency can be improved.

FIG. 9 shows another example of an anchor body to which the method of the present invention is applied. In this example, seven tensile members 32a, 32b, 32
c, 32d, 32e, 32f, and 32g are arranged adjacent to each other. In the case of such an anchor body, as shown in FIG.
a, 32c, 32e, 32g are removed by the method of the present invention, the remaining tensile materials 32b, 32d, 32
f can be directly pulled out by jacking or the like.

This has been confirmed through experiments, and as a result, the tensile members 32a, 32b, 32c, 32
It has become possible to significantly shorten the removal work time of d, 32e, 32f, and 32g compared to the conventional method.

In addition, as shown in FIG. 11, three tensile members 32
When a, 32d, and 32g are removed, other tensile material 3
It has been confirmed through experiments that 2b, 32c, 32e, and 32f can be directly pulled out by jacking or the like.

That is, in an anchor body in which tension members are arranged adjacent to each other, if some of the tension members are removed by the method of the present invention, other tension members can be easily removed, so that workability can be improved. can.

〔Effect of the invention〕

As described above, the anchor tensile material removal method according to the present invention allows the tensile material to be completely peeled off because the accumulation of peeled pieces of hardenable material caused by peeling of the tensile material does not impede the pushing of the push pipe. I can do it. Therefore, the work of applying a pulling force is omitted, which has the effect of improving work efficiency. In addition, since a very strong pushing force of the push pipe is not required, a plurality of tensile members can be removed simultaneously with one jack, which has the effect of shortening the working time and improving workability.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the anchor tension member removal method according to the present invention, FIG. 2 is a sectional view showing details of the removal state, and FIG. 3 is an enlarged sectional view taken along the line X-X of FIG. 2. , Fig. 4 is a plan view showing the anchor body before use of the present invention, Fig. 5 is a plan view showing the anchor body after use of the present invention, and Fig. 6 is a plan view showing the anchor body after use of the present invention. FIG. 7 is a top view of FIG. 6, FIG. 8 is a vertical cross-sectional view of another example of the temporary burial body used in the present invention, and FIG. FIGS. 10 and 11 are cross-sectional views showing other examples of the anchor body, and FIGS.
The figure is a sectional view showing a method for removing an anchor tension member according to the prior application. 1... Creation hole, 2... Tensile material, 3, 15... Curable material, 4... Cavity, 4'... Dummy cavity, 5,
7... Push pipe, 6... Peeling piece, 8... Jacket, 1
3, 17... Tube, 16... Pulling member, 20
...Valve, A... Anchor trunk, E... Ground.

Claims (1)

[Claims] 1. Pulling out and removing the temporary buried body from an anchor body formed by inserting a plurality of tension members attached around the temporary buried body into a created hole and casting a hardening material. In an anchor tension material removal method in which a cavity is formed inside the anchor tension material and the tension material is peeled from the curable material toward the cavity side, a push tube having an inner diameter that is the same as or slightly larger than the diameter of the tension material is removed from the tension material. Insert it into the
A method for removing anchor tension material, which comprises peeling off the tension material by pushing a push tube along the tension material. 2. The anchor tensile material removal method according to claim 1, wherein the temporary buried body is made of a synthetic fiber rope. 3. The temporary buried body consists of a tube whose outer periphery and tip are covered with a foam material, a curable material filled into the tube, and a pull-out member buried within the curable material with one end protruding. A method for removing anchor tension material according to claim 1. 4. The anchor according to claim 1, wherein the temporary burial body includes a tube that expands when filled with pressurized fluid, and a valve mechanism that is disposed at the opening of the tube and is used for supplying and discharging the pressurized fluid. How to remove tensile material.