JPS61146916A - Method and device of removing anchor tension material - Google Patents

Abstract

PURPOSE:To simply and safely remove a tensile material, by a method wherein, after a temporarily buried body is pulled off to form a cavity in an anchor, the tensile material is pulled to the center side of the cavity, and water is injected to the peeled part of an anchor. CONSTITUTION:After a tensile structure 4, formed by placing plural steel wires 2 around a rope 1 made of synthetic resin for integration, is inserted into a hole 5, cement paste is poured as a curable material 6 to form an anchor stem body 7, and the rope 1 is pulled off to form a cavity 8. At each steel wire 2, a wedge block 10 is inserted in an adhesion part of the copper wire 2 to the curable material 6, and the steel wires 2 are removed by forcibly feeding the block 10 by means of a push pipe 13, incorporating a high pressure hose 12, as a jet flow 11 through the block 10 is injected toward the adhesion part.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to improvements in a method and device for removing anchor tension members.

(Background of Chuhajutsu.

Due to their nature, anchors must be installed at a distance from the structure, and their presence may interfere with the construction work of other structures, or their installation may only be permitted during construction work. , which often has to be removed. Therefore, it can be easily removed when unnecessary.
Moreover, it is hoped that a method will be developed to facilitate the removal work.

(c) Conventional technology and problems Conventionally, when constructing an anchor, a steel rod whose surface was coated with grease, etc. was temporarily buried inside the anchor, and when it was not needed, it was pulled out and explosives were poured into the hole left behind. destroy the anchor,
Alternatively, the anchor was split by injecting water under pressure, and the tensile material was pulled out and removed.
(Special Publication No. 51-8251).

However, when the above means relies on the pressurized injection method, there is a drawback that local breakage causes leakage and pressure drop, and failure cannot be achieved over the entire length. Also, when pulling out temporarily buried steel rods,
The steel rod and anchor were also stuck to the surface film, making it difficult to remove it easily.

The examples shown in Figs. 1) and 12 are improved versions of such means, which are currently commonly used (Japanese Patent Publication No. 54-22007).

This example is characterized by the use of hollow material a. The anchor is formed by pouring a hardening material d such as mortar cement into a hole C dug in the ground. The tensile material e, which is directly or indirectly connected to the earth embankment or structure, is a prestressed steel rod or steel cable, and is placed in the hole C before the hardening material d is placed, or after the hardening material d is placed. and is installed by inserting it into the curable material d before its curing. Hollow material a
is provided by the same means as the tensile material e. A plug f is provided at the lower end of the hollow member a to prevent the curable material d from flowing into the hollow member a. Tensile material e and hollow material a are generally installed to the same extent in the created hole C circle, but if the hollow material a need be shallower than the tensile material e due to the anchoring strength of the curable material d. There is also.

To remove this anchor, a disabling agent such as gunpowder is placed in the hollow member a to reduce the fixing force of the curable material d by explosion or the like, and the tensile member e is pulled out and removed using a jack or the like.

However, since gunpowder or the like is used to reduce the fixing force of the curable material d to the tensile material e, the work is dangerous and there are problems with vibrations and noise.

Purpose of the Invention The present invention has focused on the above-mentioned conventional problems, and has an object to provide a method and device for removing an anchor tension material that can safely and quickly peel off and remove the tension material. do.

0) Structure of the Invention In order to achieve the above object, the anchor tensile material removal method according to the present invention involves inserting a plurality of tensile materials attached around a temporary buried body such as a synthetic fiber rope into a created hole. In the method of removing the tensile material from an anchor body formed by casting a curable material, the temporary buried body is pulled out and removed to form a cavity inside, and then each tensile material is drawn toward the center of the cavity. At the same time, a water jet is sprayed onto the separated part of the tensile material and the anchor body to facilitate the separation.

In addition, as a removal device for carrying out such a method, an anchor trunk formed by inserting a plurality of tensile materials into a created hole and casting a hardening material around a temporarily buried object such as a synthetic fiber rope is used. In the device for removing the tensile material from the body, a wedge block is inserted between the tensile material and the anchor body in the cavity from which the temporary buried body is removed, and a push tube is connected to the wedge block and pushed. The wedge block is provided with a jet nozzle that sprays water at the separation portion between the tension member and the anchor body.

←) Embodiments of the Invention Below, embodiments of the present invention will be described in detail with reference to the drawings.

First, a method for removing the anchor tensile material will be explained. Figures 1 and 5 show the form of the anchor body after construction, and this is a polyethylene synthetic fiber rope (about 500 mm diameter) used as a temporary burial body.
Around 1, several steel wires (12,"7II
I1) A tensile structure 4 is prepared in advance by arranging 4 to 8 pieces (6 pieces in this example) 2 at equal intervals and binding them with tape, steel wire, etc. at arbitrary intervals. This is inserted into the created hole 5, and a cement paste made of early strength cement or the like is injected as a hardening material 6 to form the anchor body 7.

When removing the steel wire 2 from such an anchor, first remove the steel wire 2 from the anchor.
). The polyethylene synthetic fiber rope 1 does not adhere to the curable material 6 or the steel wire 2, so when it is pulled, the rope itself stretches several tens of percent and becomes smaller in diameter, making it impossible to remove only the rope 1). can. As a result, a cavity 8 is formed in the center of the anchor body 7 in parallel with the steel wire 2, as shown in FIGS. 2 and 6. The steel wire 2 is left buried around the side wall of the cavity 8.

In the state shown in FIG. 2, in order to peel off the adhesion between the steel wire 2 and the hardenable material 6 and remove the steel wire 2,
It can be separated with a small force by pulling it toward the center line of the From this point of view, in this embodiment, a wedge block 10 is inserted into the attachment point between the steel wire 2 and the hardenable material 6 for each steel wire 2, and the wedge block 10 pushes the steel wire 2 toward the center. I'm trying to gravitate towards it.

The adhesion part is peeled off by discharging the jet sprayer 1 from the wedge block 10 toward the adhesion part, and the action of the water jet facilitates the separation. The jet stream 1) is such that high-pressure water is supplied through a hose 12 connected to the rear wall of the wedge block 10, and crushes the beginning of peeling of the steel wire 2, as shown in FIG. Then, as shown in FIG. 4, the wedge block 10 is pushed as the steel wire 2 peels off, and finally reaches the end of the steel wire 2, where it can be pulled out and removed. The wedge block 10 is pushed through a push pipe 13 containing the high pressure hose 12.
It is sufficient to drive it on the inlet side so as to forcibly push it in.

Thereafter, all the steel wires 2 can be removed by peeling off the remaining steel wires 2 in the same manner.

Next, the specific structure of the removal device used in the above method will be explained with reference to FIGS. 8 to 10. As shown in the figure, the wedge block 10 has a wedge-shaped cross section by cutting the tip of a cylindrical block body 14 diagonally, and this inclined surface 15 is formed by a steel wire 2.
The peeling guide surface is the same as the peeling guide surface. Further, a semicylindrical protrusion 16 is integrally provided on the outer edge of the block body 14, and a peeling groove 6A on the hardenable material 6 side formed after the steel wire 2 is peeled off (see FIGS. 7 and 10). The protrusion 16 can be inserted into the groove. Further, the block body 14 is provided with a guide ring 17 inscribed at its tip side, and a steel wire 2 is provided between the guide ring 17 and the inclined surface 15.
A pair of guide brackets 19 forming a guide hole 18 of
is installed. Therefore, the steel wire 2 is on the inclined surface 1
5 toward the center line of the cavity 8, but at this time, the guide ring 17 and the guide placket 19 restrict the guide so that the peeling direction does not deviate.

Further, a nozzle tip 20 is attached to the tip end surface of the protrusion 16 of the wedge block 10, and a flow path 2 formed inside is attached.
High-pressure water supplied from 1 is discharged as a jet stream 1) to the peeled portion of the steel wire 2. High-pressure water is supplied from the outside through a high-pressure hose 12 fitted into a socket tube 22 provided on the rear wall of the wedge block 10. Then, in order to push the wedge block 10, a push pipe 13 is screwed and connected to the outer periphery of the socket cylinder 22,
The hose 12 is protected and the wedge block 10 is pushed in. The push pipe 13 may be one that can accommodate the depth of the hole by adding a short pipe.

(G) As described in detail, according to the present invention, when removing the tensile material, the tensile material is drawn into the cavity, and at the same time, a jet stream is discharged to the peeling part to facilitate the peeling action. Because of this, the pushing force of the wedge block is small, and the removal work can be done safely and quickly, which is an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the anchor before removal according to the present invention;
The figure is a cross-sectional view of the cavity forming state, FIG. 3 is a cross-sectional view of the tensile material removal starting state, FIG. 4 is a cross-sectional view of the tensile material removal operation state, and FIG. Figure 6 is the VI of Figure 2.
-VI line sectional view, Fig. 7 is a sectional view taken along the ■-■ line in Fig. 4, Fig. 8 is a detailed sectional view of the removal device, Fig. 9 is a front view thereof,
Figure 0 is a rear view of Figure 8, Figure 1) is a plan view of a conventional anchor, and Figure 12 is a sectional view of the same. 1... Synthetic fiber rope (temporary buried body), 2... Steel wire (tensile material), 4... Tensile structure, 5... Creation hole, 6
. . . Curable material, 7. Anchor trunk body, 8. Cavity, 10. Wedge block, 1). Jet stream, 12. High pressure hose, 13. Push pipe. Figure 9 Figure 10

Claims (2)

[Claims] (1) A method of removing the tensile materials from an anchor body formed by inserting a plurality of tensile materials attached around a temporarily buried body such as a synthetic fiber rope into a created hole and casting a hardening material. After pulling out and removing the temporary buried body to form a cavity inside, each tensile material is drawn toward the center of the cavity, and a water jet is jetted to the separated part of the tensile material and the anchor body to facilitate separation. A method for removing anchor tension material, characterized by: (2) A device that removes the tensile materials from the anchor body formed by inserting a plurality of tensile materials attached around a temporary buried body such as a synthetic fiber rope into a created hole and casting a hardening material. , a wedge block inserted between the tension member and the anchor body in the cavity from which the temporary buried body has been removed;
An apparatus for removing anchor tension material, comprising: a pusher tube connected to and pushed into the wedge block, the wedge block having a jet nozzle that sprays water at a separated portion between the tension material and the anchor body.