JPS5952017A - Injection tube for injection work into ground - Google Patents

Abstract

PURPOSE:To perform a composite injection work by a method in which drilling is made by supplying water from the tube on the innermost side, the lower opening of the tube is closed by dropping a ball valve, and a quick-setting gel is injected from the outer tube and a permeating gel is injected from the side opening of the inner tube. CONSTITUTION:A boring water is sent from an opening 6 through the pipeline I to drill a pit in the ground. A ball valve 9 is then dropped into the pipeline I to close the opening 6 and water glass and a reactant are sent out through pipelines II and III. Both liquids are mixed in the neighborhood of the upper part of a closing part 12 and injected from the upper outlet 4 into the ground. When a grout of a short gelling time is further sent from the pipeline I , the grout is discharged into the space 10 from the opening 7 while expanding a rubber sleeve 7 and injected from the lower outlet 5 into the ground. These operations are made while pulling the injection tube in order. A grout of a long gelling time is injected in a lapping-over manner into the ground where the grout of a short gelling time is already injected, and therefore, an effective composite injection work can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an injection pipe for ground injection, which is an improved one-type strainer.

The conventional press-in method using a strainer first fills sand into an injection pipe installed in the ground, then washes out the sand in each injection step, and then connects the injection pipe to the tip of the strainer and injects it. This is a method in which the injection steps are oriented from top to bottom. This method is considered to be more reliable than the rod press-in T method, but The problem was that it was very time-consuming because it required washing out the solidified matter and sand inside the pipe.

In addition, in order to solve these problems, we used a double pipe with an upper discharge port and a lower discharge port, and discharged the flash-setting gel from the upper passage through the upper discharge port by switching the valve installed inside. A method has been proposed in which a packer is formed in the upper part, the upper discharge port is closed, and the penetrating gel is discharged from the lower discharge port. However, the problem with this method is that while the penetrating gel is being press-fitted, the flash-setting gel remaining in the upper passage solidifies, so it becomes impossible to alternately press-fit the flash-setting gel and the penetrating gel as the injection volume increases. This is the point where you have to change.

The purpose of the present invention is to solve the problems of the conventional injection method mentioned above and to provide a press-in pipe for ground press-in which is highly practical.

In order to achieve the above-mentioned object, the present invention includes an outer tube, first and second inner tubes built in the outer tube conduit, and a closure member that interrupts the outer tube conduit. , an upper discharge port and a lower discharge port are provided at the upper and lower positions of the blocking member on the side wall of the outer pipe, respectively, and the outer pipe line is not connected to the upper discharge port, and the first inner pipe is It extends downward through the barrier member and is provided with an upper opening and a partial opening at the lower position, the upper opening is connected to the lower discharge port, and the lower opening is configured to be freely closed. The second inner pipe is characterized in that its tip is located above the occluding member, and the conduit is connected to the upper discharge port.

Hereinafter, the present invention will be explained in detail using the accompanying drawings.

Figure 1 (a), (b), (c) and Figure 2 (a), (b), (c) are all cross-sectional views of the injection pipe according to the present invention and ground injection using this injection pipe. This is a process diagram of the construction method.

1.2 are the first and second inner tubes, respectively, and the outer tube 3
It is built into the conduit ■. Here, the first inner tube 1 is
An example is shown in which the second inner tube 2 is built in the conduit (2) of the inner tube 2, and the second inner tube 2 is built in the conduit (2) of the outer tube 3. In the outer pipe 3, a barrier member 12 is installed in the pipe line 1 to interrupt the pipe line, and on the outer wall of the outer pipe at the upper and lower positions of the barrier member 12,
An upper discharge port 4 and a lower discharge port 5, 5, .

The first inner tube 1 extends downward through the edge and the closing member 12, and an upper part lower and a lower opening 6 are provided at the lower positions, respectively. The space 10 is covered by a valve 8 and communicated through the entire space 10 with the lower discharge ports 5, 5, . Furthermore, the second inner tube 2 is located above the distal end closure member 12, and the conduit (2) is configured to communicate with the upper discharge port 4 through the opening 13 at the distal end. ]1 is a metal crown.

In the injection pipe of the present invention, as shown in FIG. 1(a), first, polling water is fed from the pipe line I to the opening 6 to drill a hole in the ground. At this time, the open lower is covered with a rubber sleeve 8, so no polling water is discharged from there.Next, as shown in FIG. After falling and closing opening 6f: Figure 1 (c
), the water glass and the reactant are sent from the pipes respectively, the two liquids are mixed near the top of the shield closing member 12, and then injected into the ground through the two-part discharge port 4. . This mixed liquid (grout) adjusts the gelation time to be short. Furthermore, when an injection material with a long gelation time is sent through the pipe ■, this injection material pushes the rubber sleeve open from the open lower part and expands into the space 10.
It is discharged into the ground from the lower discharge ports 5.5...5.

Injection from the two-part discharge port 4 and one lower discharge port 5 described above
, 5...5 may be performed at the same time while pulling up the injection tube, or the injection from the lower outlet 5.5...5 may be carried out after /-1 person from the upper outlet 4. Good too. In any case, as the injection stage is oriented upward, the injection material with a long gelation time will be superimposed on the ground into which the injection material with a short gelation time has been injected, resulting in effective composite injection. It becomes possible.

FIG. 2 shows an example of the injection tube of the present invention in which the injection tubes shown in FIG. 1 are directly connected to the upper discharge ports 4' and 4'', respectively. The water glass and the reactant are discharged from the injection pipe through the discharge ports 4' and 4'', respectively, and then mixed and injected into the ground, so it can be applied no matter how short the gelation time is. Some parts have the same structure as in Fig. 1, and Fig. 2 (a), (b), which shows the implantation process.
fc) are also shown in Figure 1 (al, (b) + (c
), the injection pipe of the present invention is used in the process of pressurizing grout into the ground while changing the injection stage by moving the injection pipe, and the injection pipe is injected from the upper outlet and the lower outlet. By using this method in conjunction with injection, a predetermined area in the ground can be uniformly, favorably, and strongly improved, and is an extremely useful invention in practice.

[Brief explanation of drawings]

No. 11 ZHal, (h), (c) and FIG. 2 (a), (b), (c) all show a cross-sectional view of a press-fit pipe according to the present invention and a process diagram of a construction method using the same. 1, U, IIIJ...Pipe line, l...First inner pipe, 2
...Second inner tube, 3...Outer tube, 4.4', 4"...
・Upper outlet, 5...Lower outlet, 6,7.13
...Opening, 8...Rubber sleeve, 9...Ball back, +2...Shiya closing part Patent applicant: Reinforcement Engineering Co., Ltd., Patent attorney, Sometani
(Ken uL) (Ken 85-den 1 diagram (C) paper 2 section Cα) (, e) (C) Commissioner of the Japan Patent Office Kazuo Wakasugi 1, Indication of case Special revision application No. 163391 of 1983, amendment Relationship with the case of a person who does

Claims (1)

[Claims] comprising an outer tube, first and second inner tubes built in the outer tube conduit, and a closure member that shuts off the outer tube conduit,
An upper discharge port and a lower discharge port are provided at double positions than the blocking member on the side wall of the outer pipe, and the outer pipe line is not connected to the upper discharge port, and the first The inner pipe extends downward through the blocking member, and is provided with an upper opening and a lower opening at the lower position, the upper opening is connected to the lower discharge port, and the lower opening is configured to be freely closed. The second inner pipe has a distal end located above the occlusion member, and this pipe line is connected to the upper discharge port.