JPH06248644A - Injecting method for filling material by use of anchor - Google Patents

Abstract

PURPOSE:To facilitate assembling work and filling work by locating a high leakage bag around the outer peripheral part of an anchor as a packer and forming a spare chamber with a low leakage sheet on the both ends of the packer in the outer peripheral part of the anchor. CONSTITUTION:Before an anchor 1 is inserted, a ground is excavated in a preceding way and then the anchor 1 mounted with a packer 2 is inserted into the excavated hole where a filling material is injected into the packer 2 by way of an expansion pipe 21. A cylindrical part of the packer 2 comes into contact with a hole wall so that the filling material is discharged outside to a satisfactory extent, thereby obtaining favorable adhesion and penetrating the surrounding rock cracks and shielding a space between the inner wall of the excavated hole and the anchor 1. Then, the filling material is injected into a spare chamber 3 on both ends of the packer 2, thereby checking the leakage of the filling material from the packer 2 in the longitudinal direction of the anchor 1. Then, the filling material is injected into the foremost depth of the hole from the rear end of a hollow passage of the anchor by way of its hollow passage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention fixes an anchor to a natural ground and reinforces the natural ground around an anchor hole.
The present invention relates to a method for injecting a filler with an anchor.

[0002]

2. Description of the Related Art There is an injection method for injecting a filler into an anchor hole by utilizing the anchor itself which is fixed in the ground. In that case, after perforating once, insert the anchor into the hole and inject the filler from the tip, but if only injected, the filler filled in the space between the hole wall and the anchor is It flows out from the mouth of the hole.
Especially in the case of an upward facing anchor, the outflow is obvious. There are several inflatable bags (packers) around the anchor.
Is generally used to expand the packer to block the space between the hole wall and the periphery of the anchor, and then to inject from the tip of the anchor. However, when the filler is injected from the tip of the anchor at a high pressure, if the adhesion between the packer and the hole wall is not large, the filler leaks through the gap between the packer and the hole wall. In order to solve these problems, packers are installed at two places on the anchor,
There is a method of inflating a packer at one place and then injecting a filler between the packers at two places to solidify the mouth.

[0003]

The conventional injection method using two packers described above can firmly protect the mouth, but has the following problems. <B> Install packers in two places, inject the filling material into each of them to expand the packer, work to fill the filling material between the packers in two places, and from the tip of the anchor It is necessary to perform the filling operation a plurality of times such as the work of injecting the intended filler. Therefore, the injection work is troublesome, and many steps are required for assembling the anchor such as the arrangement of the packer, which is uneconomical. <B> Since the packer is made of a highly leaky material, the packing material may leak from the packer during the filling step for expanding. Then, in the case of the upward anchor, the filling material flows down from the mouth, deteriorating the working environment. <C> In the case of the downward facing anchor, the leaked liquid from the packer flows into the deepest part and enters the hollow passage from the tip of the anchor. Then, the tip of the anchor is blocked, and it becomes impossible to inject it from the intended tip of the anchor into the ground.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and is filled with an anchor that can be economically assembled and constructed and that can prevent liquid leakage from the anchor. The purpose is to provide a material injection method.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the method of injecting a filler with an anchor of the present invention is such that a hollow anchor is inserted into a hole drilled in the ground,
This is a method of injecting the filler into the hole through the hollow path of the anchor to fix it, and a bag with large liquid leakage is positioned as a packer on the outer periphery of the anchor, and both ends of this packer are A preliminary chamber is formed between the anchor and the outer circumference by a small sheet, and a space between the hole inner wall and the anchor is shielded by injecting a filler into the packer to expand the packer in the circumferential direction, It is possible to prevent the filler from leaking from the packer in the axial direction of the anchor by injecting the filler into the preliminary chambers at both ends of the packer, and in this state, inject the filler to the deepest part of the hole through the hollow passage inside the anchor. It is a feature.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for injecting a filler with an anchor of the present invention will be described below with reference to the drawings. <a> Purpose of this construction method In the construction method of the present invention, the ground is first perforated, the hollow anchor 1 is inserted into this hole, and then the discharge near the tip end is performed through the hollow passage inside the anchor 1. This is a method of injecting a filler from the outlet into the hole. However, the pressure to be injected is large, and it is possible to reinforce not only the holes, but also the small rocks in the surrounding rocks to reinforce the surrounding rocks at the same time. That is, the purpose of both the reinforcement of the surrounding rock mass and the anchoring of the anchor 1 is performed through one hollow anchor 1.

<B> Structure of Packer The anchor 1 used in the construction method of the present invention has the packer 2 positioned at only one position on the outer periphery thereof. The packer 2 is a cylindrical bag body and is fixed around the anchor 1. By supplying the filling material to the inside of the bag body, the bag body expands circumferentially around the anchor 1 and interrupts the gap between the anchor 1 and the hole wall. This is the action of the packer 2. For that purpose, the packer 2 is connected with an expansion pipe 21 for supplying the filler from the outside of the hole. Further, the packer 2 used in the construction method of the present invention
Uses a particularly leaky fabric to form the bag.
The material having large liquid leakage differs depending on the viscosity of the filling material with which the inside of the bag is filled, but may be made of a known material such as nylon, tetron, or cotton. Use such a material adjusted to have an air permeability of 0.001 to 0.5 m ³ / m ² / sec.

<C> Spare chamber The packer 2 is fixed to the outer periphery of the anchor 1 in a cylindrical shape, and the spare chambers 3 are provided at both ends of the cylinder. The preparatory chamber 3 is provided with a packer 2 with a sheet having small liquid leakage.
The end surface of the anchor and the outer periphery of the anchor 1 are surrounded. Therefore, a cylindrical hose-shaped material is fixed to the outer periphery of the anchor 1 by fixing the edge of one end to the edge of the cylindrical portion of the packer 2 by sewing or the like and reducing the diameter of the other end. . This attachment can be done by a simple method such as strapping. A material having low liquid leakage is a relative material having low liquid leakage as compared with the material forming the packer 2, although it depends on the viscosity of the filler used. However, if you use a completely water-stopping material, there will be no air escape when you supply the filler, and air will accumulate, so
Use a commercially available material that blocks the permeation of the filler but allows the permeation of air. Since the preliminary chamber 3 is provided only on both ends of the packer 2, the preliminary chamber 3 does not exist on the cylindrical side surface of the cylindrical packer 2, and the material having large liquid leakage is exposed as it is on the side surface. It will be.

[0009]

[Construction method]

<A> Insertion of anchor 1 Next, a construction method will be described. First, before the insertion of the anchor 1, the ground is drilled in advance. Then, the anchor 1 having a hollow passage formed therein is inserted into the hole. The anchor 1 has a filler discharge hole opened near its tip, and the filler supplied from the tail end of the anchor 1 is discharged into the anchor 1 hole from the tip discharge hole.

<B> Packing into Packer 2 After the anchor 1 with the packer 2 attached is inserted into the hole, the packing material is injected into the packer 2 through the expansion pipe 21. Then, the packer 2 expands in the circumferential direction to form a cylindrical shape, and the side surface of the cylinder expands until it collides with the inner wall of the hole. In this way, the anchor 1 and the space around it can be shielded. However, the material of the packer 2 is made of a material having a relatively rough mesh and a large leaking property of the filler. Therefore, even if the cylindrical portion of the packer 2 comes into contact with the hole wall, the filling material can be sufficiently discharged to obtain good adhesion, and at the same time, it can penetrate into the cracks of the surrounding rock and form the seal zone 4. .

<C> Filling of the preliminary chamber 3 The filling material is discharged not only from the side surface of the cylindrical portion to the outside, but also from the end surface thereof. However, since the preparatory chamber 3 is arranged at both ends of the packer 2, the filling material is discharged into the preparatory chamber 3. Since the material forming the preliminary chamber 3 does not have a good liquid leakage property, the filling material is not discharged to the outside, and if it is sufficiently filled inside, further filling becomes difficult. When this state is detected, the supply of the filler to the packer 2 is completed. In this way, the packer 2 and both sides thereof are completely in contact with the hole wall, so that leakage of the filler in the axial direction of the anchor 1 is completely prevented.

<D> Filling from the tip In this state, the filler is injected into the deepest part of the hole from the tail end of the hollow passage through the hollow passage inside the anchor 1, as described above, between the anchor 1 and the hole wall. Since the gap is completely and firmly shielded, the filler can be supplied into the hole from the tip of the anchor 1 with a large pressure. Then, the filler is filled even inside the fine cracks near the deepest part of the hole, and the fixing and reinforcing zone 5 is formed. As a result, the anchor 1 is well anchored and the rock around the deepest part is well reinforced.

[0013]

Since the method of injecting the filler with the anchor of the present invention is as described above, the following effects can be obtained. <B> When filling with anchors, there is no problem in the case of low-pressure injection, but there are contradictory requirements in the case of high-pressure injection into rock. That is, it is required that the packer adheres highly to the hole wall and that the liquid leakage is small. However, in order to improve the adhesion of the packer to the inner wall of the hole, it is desirable that the filler leaches from the packer to the outside, but if there is a large amount of leakage from the packer to the outside, it will return to the mouth in large quantities and stain the surrounding area. Or, it penetrates into the tip of the anchor from the deepest part of the hole and makes the target injection impossible. In that respect, the present invention permits the leaching of the filler from the contact surface of the packer to the hole wall, while the leaching into the hole is prevented by the preliminary chamber. Therefore, it can be expected that liquid leakage to the mouth and the deepest part of the hole can be prevented and good adhesion to the wall of the hole can be expected. <B> For strong fixing in the hole, there is a method of providing packers at two places and providing a filling portion for sealing between them, but the structure is simple as compared with such a method. Therefore, the assembly work of the anchor is simple, and complicated filling work and filling management are not required, so that even an unskilled worker can easily carry out the construction.

[Brief description of drawings]

FIG. 1 is an explanatory view of a method of injecting a filler with an anchor.

FIG. 2 is an explanatory view of a method for injecting a filler with an anchor.

FIG. 3 is an explanatory view of a method of injecting a filler with an anchor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keita Ito 1-1-18 Nishiaraieicho, Adachi-ku, Tokyo Nisshin Spinning Co., Ltd. Nishiarai Kasei Plant

Claims (1)

[Claims] 1. A method of inserting a hollow anchor into a hole drilled in the ground, and injecting a filler from the vicinity of the tip of the anchor into the hole through a hollow path of the anchor to fix the anchor. A bag with a large liquid leak is positioned as a packer, and both ends of this packer form a preliminary chamber between the outer circumference of the anchor and a sheet with a small liquid leak, and a packing material is injected into the packer. The space between the inner wall of the hole and the anchor is shielded by enlarging the circumference of the hole, and the filler is injected into the preliminary chambers at both ends of the packer to prevent leakage of the filler from the packer in the axial direction of the anchor. Then, in this state, the filler is injected into the deepest part of the hole through the hollow passage inside the anchor.