JPH0771028A - Ground imprgnation method and ground impregnation device - Google Patents

Abstract

PURPOSE:To enable the impregnation of the soil improvement material into holes in the ground efficiently. CONSTITUTION:A reinforcing pipe is inserted in the ground, and in the case the soil improvement material is impregnated from the reinforcing pipe 1, impregnation ports 11 are provided lengthwise of the reinforcing pipe 1. A plurality of packers 2 are inserted in the reinforcing pipe 1, and the packers 2 are swelled to cut off the hollow of the reinforcing pipe 1 into several spaces. The soil improvement material is impregnated into the ground from the impregnation ports 11 in the 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, a method has been used in which an excavation hole 5 is opened in the ground, a pipe is inserted, and a ground improvement material is injected into the excavation hole 5 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 soil was injected from one point at the tip of the pipe into the ground, it was difficult to inject it into the ground over the entire length of the pipe because the ground improvement material could only penetrate into the ground at that portion.

[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 a plurality of tubes for injecting ground improvement material are arranged in the pipe, and the insides of the pipe are cut off into a plurality of spaces by the plurality of packers arranged between the injection holes in the pipe. A ground injection method characterized by injecting a ground improvement material into each of the created spaces, and injecting the ground improvement material into the ground through each tube, the blocked space and the injection hole, or the ground In a ground pouring device for pouring a ground improvement material into a pipe, a pipe provided with a plurality of pouring holes in a longitudinal direction, and a pipe arranged inside the pipe between the pouring holes, and having a plurality of spaces inside the pipe. Multiple packers to block , A plurality of injection tubes corresponding to tubes capable of injecting a ground improvement material into each of the blocked spaces, and each of the injection tubes, the blocked space, and the injection holes, through which the ground improvement material is placed in the ground 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.

<B> Outline of Embodiment The ground improvement material is uniformly injected into the excavation hole 5. For that purpose, the reinforcing pipe 1 provided with a plurality of inlets 11 in the longitudinal direction is installed in the excavation hole 5. A plurality of packers 2 are inserted into the reinforcing pipe 1 and inflated to block the inner space of the reinforcing pipe 1 into some spaces. An injection port 11 is provided in the closed space. Then, the ground improvement material can be separately injected into each space, and the ground improvement material can be uniformly injected into the entire excavation hole 5 through the injection port 11.

<B> Reinforcing Pipe The reinforcing pipe 1 has a hollow shape into which the packer 2 can be inserted, and has a plurality of inlets 11 communicating with the hollow in the longitudinal direction. Further, a plurality of injection holes 11 are also formed in the circumferential direction of the reinforcing pipe 1. A caulking material 51 is arranged around the reinforcing pipe 1 at the mouth of the excavation hole 5 to prevent the ground improvement material injected into the excavation hole 5 from leaking.

<C> Packer The packers 2 are bags and are connected to a plurality of hollow packer tubes 3. A packer inlet 31 formed in the packer tube 3 is located inside the packer 2, and the injection material is injected into the packer 2 through this inlet. As a result, the packer 2 expands. As the injection material, for example, cement milk, urethane foam or the like is used. Since the packer 2 is disposed inside the reinforcing pipe 1 and between the inlet 11 and the inlet 11, when it expands, the inner space of the reinforcing pipe 1 is blocked into a plurality of spaces. As a result, the injection port 11 is arranged in the closed space.

<D> Ground improvement material tube A plurality of ground improvement material tubes 4 and a packer tube 3 are provided.
Together with the reinforcing pipe 1. The tip of the soil improvement material tube 4 has an opening 41, and the soil improvement material is discharged from the opening 41. The tip of a certain ground improvement material tube 4 is arranged in a space partitioned by a certain packer 2,
The tip of another ground improvement material tube 4 is arranged in a space separated by another packer 2. That is, the tip of another soil improvement material tube 4 is arranged in each space divided by the packer 2, and the soil improvement material is supplied independently. In addition, not necessarily
The opening 41 need not be provided at the tip, but may be provided at the side surface. In that case, the openings 41 are respectively arranged in spaces separated by the packer.

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

<a> Expansion of packer The reinforcing pipe 1 is inserted into the excavation hole 5, and the caulking material 51 is attached to the mouth. Insert the packer 2 together with the packer tube 3 and the ground improvement material tube 4 inside the reinforcing pipe 1,
It is placed between the inlets 11. An injecting material such as urethane is injected into the packer tube 3, the packer 2 is expanded, and the inner space of the reinforcing pipe 1 is blocked into a plurality of spaces. There is a corresponding inlet 11 in each closed space. Packer 2
When it expands, it expands so as to cover the ground improvement material tube 4 and blocks the inner space of the reinforcing pipe 1.

<B> Injection of ground improvement material into excavation hole The ground improvement material is simultaneously injected from each ground improvement material tube 4 into each space blocked by the packer 2. The ground improvement material is filled in each space, and is injected into the excavation hole 5 from there through the injection port 11. At this time, since the tip of the ground improvement material tube 4 is arranged in each space separately, adjusting the ground improvement material flowing in each ground improvement material tube 4 will improve the ground evenly in the front or rear of the excavation hole 5. Material 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> The reinforcing pipe 1 to be inserted into the ground is inexpensive because it is only necessary to open a plurality of injection ports 11 and it is not necessary to attach an expensive check valve or the like. <C> Since long pipes can be injected at a time, it can be injected in a short time. <D> The reinforcement of the ground by the reinforcement pipe 1 and the 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

Claims (2)

[Claims] 1. A ground pouring method for pouring a ground improving material into the ground, wherein a pipe having a plurality of injection holes formed in a longitudinal direction is installed in the ground, and a plurality of packers and the ground improving material are provided in the pipe. A plurality of tubes to be injected are arranged, and a plurality of packers arranged between the injection holes in the pipe block the inner space of the pipe into a plurality of spaces, and a ground improvement material is provided for each of the blocked spaces. The ground injection method is characterized by injecting tubes that can be injected and injecting the ground improvement material into the ground through each tube, the blocked space, and the injection hole. 2. A ground injection device 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 between the injection holes in the pipe. A plurality of packers for blocking the inner space into a plurality of spaces, a plurality of injection tubes corresponding to the tubes capable of injecting a soil improvement material in each of the blocked spaces, each of the injection tubes, and the blocked space And a ground improvement material capable of injecting the ground improvement material into the ground through the injection hole.