JPH0776822A - Method and apparatus for grouting - Google Patents

Abstract

PURPOSE:To efficiently inject a soil improvement agent into the ground. CONSTITUTION:A reinforcing pipe 2 is inserted in the ground and when a soil improvement agent is injected from the reinforcing pipe 2 into the ground, an injection opening 21 is provided in the longitudinal direction of the reinforcing pipe 2. Further, a multiple-tube 3 and a plurality of packers 4 fitted thereto are inserted in the reinforcing pipe 2 and the packers 4 are protruded outward to divide the inside of reinforcing pipe into some spaces and the soil improvement agent is injected into the ground from the injection opening 21 of the respective spaces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for injecting a ground improvement material into the ground.

[0002]

2. Description of the Related Art Conventionally, there has been performed a method of forming a drill hole in the ground, inserting a pipe, and injecting a ground improvement material into the drill hole from the mouth of the pipe.

[0003]

However, the conventional method has the following problems. <A> In the method of injecting the ground improvement material into the ground from the mouth of the pipe, it was difficult to inject the improvement material only in a portion where the improvement material easily enters and to fill the entire length of the pipe. <B> As a soil improvement material, a soil improvement material that hardens quickly and a foamable material with high strength (for example, hard urethane foam)
In the case of a long pipe or a thick pipe, it took time for the ground improvement material to reach the tip, so that it hardened in the middle of the pipe or in the front part, and it was difficult to inject it over the entire length of the pipe. <C> Since the pipe was being injected into the ground from one point, the ground improvement material could only permeate into that area. It was difficult to inject it into the ground over the entire length of the pipe.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and an apparatus capable of efficiently injecting a ground improvement material into a hole in the ground.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to a ground pouring method for pouring a ground improving material into the ground, in which a pipe having a plurality of injection holes in the longitudinal direction is installed in the ground and A plurality of packers and multiple pipes for injecting ground improvement material are arranged in the pipe, and the insides of the pipes are cut off by a plurality of packers arranged between the injection holes in the pipes to be cut off. One of the multiple pipes is associated with each of the spaces, a ground improvement material is injected, and the ground improvement material is injected into the ground through the multiple pipe, the blocked space and the injection hole. A ground injection method or a ground injection device for injecting a ground improvement material into the ground, a pipe provided with a plurality of injection holes in the longitudinal direction, and arranged between the injection holes in the pipe, A plurality of pads for blocking the inner space of the pipe into a plurality of spaces -, And one pipe is associated with each of the blocked spaces, and a multiple pipe for injecting the ground improvement material, and the ground improvement material in the ground through the multiple pipe, the blocked space, and the injection hole It is in the ground injection device characterized by being able to inject into.

[0006]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings.

<A> Outline of Embodiment (FIGS. 1 and 2) The ground injection device 1 is for uniformly injecting the ground improvement material into the excavation hole 6. Therefore, the reinforcing pipe 2 having the plurality of injection ports 21 provided in the longitudinal direction is installed in the excavation hole 6. When a plurality of packers 4 attached to the multiple pipe 3 are inserted into the reinforcing pipe 2 and the inner pipe 31 and the outer pipe 34 of the multiple pipe 3 are slid by the jack 5, the packer 4 projects outward and the reinforcing pipe Cut off the inner space of 2 into some spaces. The blocked space has an injection port 21. The ground improvement material is separately injected into each of the closed spaces, the ground improvement material is discharged from each of the inlets 21 to the entire excavation hole 6, and the entire excavation hole 6 is filled with the homogeneous ground improvement material.

<B> Reinforcing Pipe (FIGS. 1 and 2) The reinforcing pipe 2 has a hollow shape into which the packer 4 can be inserted, and has a plurality of injection ports 21 communicating with the hollow in the longitudinal direction. A caulking material 61 is arranged around the reinforcing pipe 2 at the mouth of the excavation hole 6 to prevent the ground improvement material injected into the excavation hole 6 from leaking.

<C> Multi-tube (FIGS. 1 to 3) The multi-tube 3 has a large number of concentric tubes, and a packer 4 is mounted between the tubes. Each pipe except the outer pipe 34 has a charging port 36, and the ground improvement material is charged from the charging port 36. The improving material injected from the charging port 36 of the inner pipe 31 passes through the inner pipe 31 and is discharged from the opening 35 at the tip. The improving material injected from the charging port 36 of the small intermediate pipe 32 passes through the space surrounded by the small intermediate pipe 32 and the inner pipe 31, and is discharged from the opening 35 of the small intermediate pipe 32. Similarly, the large intermediate pipe 33 is also discharged from the inlet 35 through the inlet 35.
The jacks 5 are attached to the inner pipe 31 and the outer pipe 34, and each pipe slides as the jack 5 expands and contracts.

<D> Packer (FIGS. 1 to 3) The packer 4 is made of a flexible material and has both ends holding portions 41.
The holder 41 is attached to each tube of the multiplex tube 3. When the jack 5 is extended, the inner pipe 31 is pulled forward, and the outer pipe 34 is pushed out, the packer 4
Project outwards. When projecting outward, the packer 4 blocks the space of the reinforcing pipe 2 to form a plurality of blocked spaces.

The process of injecting the ground improvement material will be described below.

<B> Projection of Packer The reinforcing pipe 2 is inserted into the excavation hole 6, and the caulking material 61 is arranged at the mouth of the excavation hole 6. The multiple pipe 3 with the packer 4 attached is inserted into the reinforcing pipe 2 and arranged so that the packer 4 is located between the inlets 21. By extending the jack 5, each packer 4 is pushed outward, and the inner space of the reinforcing pipe 2 is blocked into a plurality of spaces. There is a corresponding inlet 21 in each closed space.

<B> Injecting the soil improvement material into the excavation holes At the same time, the soil improvement material is injected into each of the spaces blocked by the packer 4 from the respective inlets 36 of the multiple pipe 3. The ground improvement material is filled in each space, and the ground improvement material is discharged from there through the inlet 21 to the excavation hole 6. At this time, since the openings 35 of one pipe of the multiple pipes 3 which are separate from each other are arranged in each space, adjusting the ground improvement material to be flown to each pipe makes it possible to evenly improve the ground improvement material both inside and outside the excavation hole 6. Can be injected.

[0014]

According to the present invention, the following effects can be obtained. <B> Since a ground improvement material that hardens quickly and a foamable material with strong strength, such as hard urethane foam, can be injected uniformly into the ground using a long pipe or a thick pipe, reliability is improved. High ground improvement can be performed. <B> Since long pipes can be injected at the same time, they can be injected in a short time. <C> Reinforcement of the ground by the reinforcement pipe and reinforcement by the ground improvement material can be obtained at the same time.

[Brief description of drawings]

[Fig.1] Layout of reinforcing pipe and packer

[Fig. 2] External view of the reinforcing pipe and packer

[Figure 3] Enlarged view of the packer

FIG. 4 is a cross-sectional view taken along the line AA in FIG. 1 of the multi-tube input port.

Claims (2)

[Claims] 1. A ground injection method for injecting a ground improvement material into the ground, wherein a pipe having a plurality of injection holes in a longitudinal direction is installed in the ground, and a plurality of packers and the ground improvement material are installed in the pipe. A multiple pipe for injection is arranged, and the inner space of the pipe is cut off into a plurality of spaces by a plurality of packers arranged between the injection holes in the pipe. A ground pouring method, wherein two pipes are associated with each other, a ground improvement material is injected, and the ground improvement material is injected into the ground through the multiple pipes, the blocked space, and the injection hole. 2. A ground injection apparatus for injecting a soil improvement material into the ground, comprising: a pipe having a plurality of injection holes in a longitudinal direction; and a pipe disposed in the pipe between the injection holes. A plurality of packers for blocking the inner space into a plurality of spaces, one pipe for each of the blocked spaces, and a multiple pipe for injecting a ground improvement material, the multiple pipes, the blocked spaces and the A ground injection device, which is capable of injecting a ground improvement material into the ground through an injection hole.