JPH101937A - Chemical grouting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability by installing a chemical mixing means among check valves mounted to the outlets of first and second flow paths carrying first and second chemicals and a nozzle. SOLUTION: A chemical grouting device is composed of a main body 10 with packers 17a, 17b..., first and second flow paths 11, 12, check valves 13, 14, a mixing means 15 and a nozzle 16. The chemical grouting device is inserted into an outer tube 20 set up to a ground, and the packers 17a, 17b... are expanded and fast stuck onto the tube 20. Two-pack curing type first and second chemicals are force-fed from the flow paths 11, 12 respectively, and mixed uniformly by the mixing means 15 and discharged to the outside from the nozzle 16 while being permeated to the ground from cracks beforehand formed to the outside by cracking. The supply of one of the first and second chemicals is stopped after the execution of works and the mixed chemicals are discharged to the outside, and a curing component is not left in the device. Accordingly, curing performance can be improved, the term of works can be shortened, and the device after the execution of works can be washed easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a seal between the inside of an injection hole such as a boring hole formed in the ground or a sleeve pipe installed therein and the outside of the apparatus main body set in the injection hole. TECHNICAL FIELD The present invention relates to a chemical solution injection device provided with a packer for injecting a chemical solution into a space sealed by the packer and improving the ground around an outer tube with the chemical solution.

[0002]

2. Description of the Related Art An injection device of this type has been used for the purpose of improving the ground.
3235 or JP-A-2-296925. However, all of these conventional techniques have been aimed at injecting a one-liquid type chemical solution. Although not specified in the former, it is clear that it is a one-liquid type since there is only one chemical liquid passage, and the latter is as in cement milk and the like.

However, since the one-liquid type chemical liquid has a long curing time, there is a problem that the construction is troublesome. On the other hand, if it is not washed immediately after use, there is a drawback that the chemical liquid hardens and the passages are clogged. However, it was difficult to complete the washing and it was difficult to handle.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and its object is to shorten the construction period and to eliminate the need for cleaning after use, or at least to facilitate cleaning. It is to be able to do.

[0005]

In order to solve the above-mentioned problems, the present invention uses a mixture of at least two components as a chemical solution, and at least a first flow path 11 for transporting a first chemical. And a second flow path 1 for transporting a second drug
Are provided in the apparatus main body 10, and check valves 13 and 14 are provided at the outlets in the main body of the first and second flow paths 11 and 12, respectively, and a mixing means 15 for mixing at least two kinds of drugs is provided. A means is provided between the downstream of the check valve and the nozzle 16 formed in the apparatus main body.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A chemical injection device according to the present invention is
It is mainly used to improve the ground around an injection hole such as a borehole formed in the ground and a sleeve pipe installed therein.

An injection hole is provided to a required depth for the injection work by this apparatus. In order to install the outer pipe 20, drilling is performed by means such as casing digging, and then the seal grout 22 is filled into the hole 21, and the sleeve pipe 23 is immediately inserted while being added, and then the casing pipe is pulled out. Reference numeral 24 represents a joint. Thereafter, after the seal grout is solidified, the chemical liquid injection operation by the present apparatus is performed. Therefore, the injection hole in this example is the sleeve tube 23 called the outer tube.

The drug solution to be injected is of a type in which at least two drug components are mixed. Since one kind of chemical solution alone does not cure, handling is remarkably facilitated. In many cases, usable liquid chemicals are provided as a two-liquid mixed type, and for example, there are epoxy type and water glass, and any of them can be used in the present invention. The drug component may be a mixed type of liquid and solid (for example, powder). Among the usable chemicals, commercially available ones are represented by trade names, such as hard risers, clean locks, nutites, MG locks, and Sekisui LG.

The body 10 of the device of the present invention has a packer. The chemical solution is injected into the space S sealed by the packer. Therefore, the chemical solution injection device basically has a structure in which a plurality of packers 17a, 17b,... Are provided, a space S sealed by the adjacent packers 17a, 17b is partitioned, and a chemical solution is injected into the space S. The packer has a structure capable of expanding and contracting (restoring) to seal between the inside of the outer tube 20 and the outside of the apparatus body 10. The dashed line 17 'in FIG. 1 is an exaggerated view showing the state of expansion and contact with the inside of the outer tube.

The apparatus body 10 has at least a first flow path 11 for transporting a first drug and a second flow path 12 for transporting a second drug for transporting a second drug. Is provided. A fluid transport path 19 for transporting a fluid for expanding the packer is also provided in the apparatus main body 10 (FIG. 5). Then, the first and second drugs supplied into the main body from the respective channels 11 and 12 come into contact with the counterpart drug except at the time of injection, or the counterpart channel 1
In order to prevent the backflow of 1, 1
14 are provided at the outlets in the main body of the first channel 11 and the second channel 12, respectively.

In the illustrated embodiment, the first flow path 11 and the second flow path 12 are both formed by pipes, and their ends communicate with the introduction chamber 25 as outlets in the main body. Check valve 13,
Reference numeral 14 denotes a valve body 26 disposed at each outlet and a spring means 27 for pressing the valve body 26 in a closing direction (from downstream to upstream).
Composed of and. If a third channel is needed,
A check valve can also be provided therewith.

The first channel supplied through each of the channels 11 and 12
Mixing means 15 for mixing the first drug and the second drug
The nozzle 1 formed in the apparatus main body 10 from the downstream of each check valve
6 is provided. In other words, the first and second chemicals are mixed by passing through the mixing means 15, and after being hardened, supplied to the outside of the apparatus main body from the nozzle 16 and permeate into the ground. The mixing means 15 may have any formal structure as long as it can effectively mix a plurality of components.

In the illustrated embodiment, a passage 29 extending from the upstream introduction chamber to the downstream nozzle chamber 28 is formed inside the main body 10, and a member having a spiral wing portion 30 is incorporated in the passage 29. It is. Therefore, the mixing means 15 in the illustrated example is a kind of static mixer, but is not limited to this, and a rotary type or another type can be used.

The nozzle 16 is for ejecting the chemical liquid into the space sealed by the packer 17 outside the apparatus main body 10, and usually one or plural nozzles are provided (FIG. 6). The exemplary nozzle 16 communicates with a nozzle chamber 28 and is located furthest downstream. The illustrated apparatus body 10 is an outer tube 2
It is elongated in the axial direction to insert it into
The structure is such that the chemical solution is ejected radially outward with the axis as the center.

The fluid transport path 19 for expanding or restoring the above-mentioned packers is provided with respective packers 17a, 17b.
... is led to. The fluid can be a liquid or a gas, but air has been used successfully in embodiments.

In the embodiment, a bendable flexible tube portion 18 is connected between a plurality of packers 17a and 17b so that the injection device can be easily inserted even if the outer tube 20 has a locally bent portion. It has a unique structure. In some cases, the flexible tube portion 18 is unnecessary. The apparatus main body 10 is structurally divided into several parts, and a sealing means 31 is provided at each connection part to obtain a liquid-tight and air-tight effect. The drawings do not necessarily indicate a faithful shape structure.

The thus configured chemical injection device is inserted into the outer tube 20 (or directly in the soil) formed as described above from the distal end portion 32. Then, it is stopped in a predetermined position, and the outer pipe 20a is expanded by expanding the packers 17a.
And the space S between the adjacent packers 17a and 17b is shielded from above and below. Then, when the drug is pressure-fed from the first channel 11 and the second channel 12, the first channel
The second agent and the second agent are evenly mixed by passing through the mixing means 15, and are jetted to the outside from the nozzle 16 in an optimal mixed state, and cracked by water pushing to the ground from cracks formed outside beforehand. Penetrate.

After the above-mentioned chemical liquid injection work is completed, the supply of either the first or the second chemical (the main agent and the curing agent) is stopped, and the supply of only one of them is continued, so that the check valve 13,
By means of 14, the whole mixed chemical solution can be discharged out of the main body. Therefore, the curing component does not remain in the main body of the device, and since only one drug remains, it does not cure,
It can be easily removed if necessary.

[0019]

EFFECTS OF THE INVENTION Since the present invention is constructed and acts as described above, at least two kinds of components can be uniformly mixed and can be penetrated into the ground in a state where the performance of the chemical solution is sufficiently extracted. Thus, an ideal ground improvement can be realized, the construction period can be shortened, and there is no possibility that the chemical liquid will be solidified and become unusable after construction.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a drug solution injection device according to the present invention.

FIG. 2 is an enlarged sectional view showing a check valve of the same device.

FIG. 3 is an enlarged sectional view of a portion from the mixing unit to the nozzle.

FIG. 4 is an enlarged cross-sectional view of the tip portion of the same.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 3;

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[Procedure amendment]

[Submission date] September 26, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction contents]

FIG. 5

FIG. 6

[Figure 1]

FIG. 2

FIG. 3

FIG. 4

Claims (4)

[Claims] A packer is provided for sealing between an inside of an injection hole such as a bored hole formed in the ground or a sleeve tube installed therein and an outside of an apparatus body set in the injection hole. A device for injecting a chemical solution into the space sealed by the packer and improving the ground around the outer pipe with the chemical solution, wherein at least two kinds of components are mixed as the chemical solution; A first flow path 11 for transporting a drug and a second flow path 1 for transporting a second drug
2 is provided in the apparatus main body 10, and check valves 13 and 14 are provided at the outlets in the main body of the first and second flow paths 11 and 12, respectively, and a mixing means 15 for mixing at least two kinds of drugs is provided. A chemical solution injection device provided between a downstream of a check valve and a nozzle 16 formed in a device main body. 2. The chemical solution according to claim 1, wherein the apparatus main body 10 has a plurality of packers 17a, 17b, ... Which are provided at intervals in the longitudinal direction, and has a bendable flexible tube portion 18 between each packer. Injection device. 3. The chemical solution injection according to claim 1, wherein the apparatus main body 10 has a plurality of packers 17a, 17b ... Which are provided at intervals in the longitudinal direction, and a nozzle 16 is provided between each packer. apparatus. 4. The liquid injector according to claim 1, wherein the mixing means has a structure in which a member having a spiral wing portion is incorporated in a passage provided in the apparatus main body.