JPS5924029A - Removal of earth anchor - Google Patents

Abstract

PURPOSE:To remove an earth anchor from cement mortar by a method in which an inner space surrounded by steel wires is provided at the tip of an earth anchor, an expandible flat tube surroudning the steel wires is set, and the flat tube is expanded when removing the earth anchor. CONSTITUTION:A hole 15 is provided at the center of the center part 13 of the core 12 of an earth anchor and plural piano wires 16 and porous rubber 24 are provided around the center part 13. They are then covered witn a flat tube 21 to make up the tip portion of the core 12 of the earth anchor. The earth anchor is penetrated into a hole 11 drilled in the ground and fixed with cement mortar. When removing the earth anchor, pressure water is supplied through a pipe 22 leading to the flat tube 21, whereupon the flat tube is expanded, the center part 13 of the core 12 is crushed, and the core 12 is separated from cement mortar 18.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing an earth anchor.

Conventionally, when removing an earth anchor, it has been difficult to remove it because the ground anchor is made of piano wire or the like and is firmly connected to mortar or the like at a deep underground location. Therefore, it is common practice to cut off the removable part and leave the deeper part without completely removing the shingle member, and it is common practice to install the earth anchor by cutting it at the removable part and leaving it alone. In many cases, various problems may occur.

The present invention solves the above-mentioned problems and provides a method for removing an earth anchor in which the shin member is completely removed.

Embodiments of the present invention will be described below with reference to the drawings.

In one embodiment of the present invention shown in FIGS. 1 to 5, 10 is a sheet pile, and 1j is a hole dug in the ground to constitute an earth anchor. Reference numeral 12 denotes a base member of the earth anchor extending in the center of this hole, and has a central member 13 made of synthetic resin and having a large hole 15 in the center. This central member 13 is formed to have a sufficiently larger diameter than the conventional one. Reference numeral 24 is a porous material made of synthetic resin, rubber, etc., which is provided in an appropriate number as required so as to extend along the central member 13.

Reference numeral 16 denotes a plurality of steel wire members arranged around the central section 13, each made of twisted steel wires such as piano wire. The central member 13, steel wire member 16, etc. are maintained in a predetermined arrangement shape by liners (not shown) at appropriate intervals. Reference numeral 17 denotes a synthetic resin pipe extending a predetermined length in the hole 1.1, through which the sealing member 12 passes. 1
Reference numeral 8 denotes mortar or concrete (hereinafter referred to as mortar, etc.) supplied from the outside of the pipe 17 in the hole 11 and hardened, so that it is firmly connected to the insulation member 12 beyond the tip of the pipe 17. There is.

20 is a partition plate that covers the tip of the pipe 17.

Reference numeral 21 denotes a metal flat tube made of metal such as copper, copper alloy, iron, etc., and has a spiral cross-sectional shape that becomes thinner in a direction perpendicular to the shin member 12, and the shin member 12 is made of mortar or the like. It is arranged so as to almost surround the outside of the part to be buried in 18, and is buried in mortar etc. 18 together with insulation member 12, and metal pipes 22 with a circular cross section are integrally attached to both ends. It communicates and is led out to the outside, passes through the partition plate 20, and then passes through the inside of the pipe 17 to reach the vicinity of the sunrise of the hole 11. Normally, the flat tube 21 can be formed into a flat shape by processing a pipe integrated with the pipe 22.

When the earth anchor configured as described above is to be removed after use, the sheet pile 10 is removed. Next, one pipe 2
2 to the other pipe 22 by supplying pressurized liquid such as water.
When the end of is reached, this end is closed. When pressurized liquid is continuously supplied, the flat tube 21 as shown in FIGS. 4 and 5
bulges out and crushes the center member 13 of the shin member 12, separating the shin member 12 from the mortar or the like 18.

This squeezing action usually starts from this part when a porous material 24 is used. In this state, the shin part A
It can be easily removed by pulling 12.

In this invention, as described above, the sill member 12 is pulled out from the mortar 18.
This has the effect that it can be easily separated and completely removed.

In addition, in this invention, as shown in FIG. 6, a plurality of flat tubes 21 surrounding the herring member 12 and extending in the direction of the herring member 12 may be connected by a portion 25 having a circular cross section. Furthermore, as shown in FIG. 7, a material may be used as the herring member 12 in which the center member 13 is not hollow, but is made of synthetic resin or rubber and is porous, and is capable of contracting when subjected to a large external pressure. Of course.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing an earth anchor according to an embodiment of the present invention, Fig. 2 is an enlarged cross-sectional view taken along line A-A in Fig. 1, Fig. 3 is a perspective view showing a flat tube, and Fig. 4 is an operation. FIG. 5 is a longitudinal sectional view of the state, FIG. 6 is a perspective view of a flat tube used in another embodiment of the present invention, and FIG.
The figure is a cross-sectional view showing a state in which a shin member used in another embodiment of the present invention is installed. 11 is a hole, 12 is a shin member, 13 is a center member, 16 is a steel wire member, 18 is mortar, etc., 21 is a flat tube, and 22 is a pipe. Agent Patent Attorney Akira Katsube Chojiぢρ〉t7

Claims (1)

[Claims] A method for removing an earth anchor in which one end of a shingle member is embedded in mortar or concrete and has a central member extending in the center and a plurality of steel wire members each having twisted steel wires extending around the central member, the method comprising: The part of the member to be buried in the mortar or concrete is configured such that at least the central member is crushed inward when subjected to external pressure greater than a predetermined value, and the part of the core member to be buried in the mortar or concrete is configured. A step of arranging a metal flat tube that is thinned in a direction substantially perpendicular to the extending direction of the shin member so as to almost surround the periphery of the part and embedding it in mortar or concrete together with the shin member, and when removing the earth anchor, inserting it into the flat tube. separating the shingle member from the mortar or concrete by supplying a pressurized liquid to compress the shingle member inwardly and crushing the center member;
A method for removing an earth anchor, comprising the step of pulling out a support member.