JP2814475B2 - Chemical injection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal between the inside of an injection hole such as a bored hole formed in the ground and a sleeve tube installed therein, and the outside of the apparatus 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.
No. 3235 or JP-A-2-296925. However, all of these conventional techniques are directed to the injection of a one-part type drug 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, a one-part chemical solution has a problem that it takes a long time to carry out the construction work since the curing time is long. On the other hand, if it is not cleaned immediately after use, there is a disadvantage that the chemical liquid hardens and the passages and the like 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. Another object of the present invention is to provide a device which is particularly suitable for injecting a chemical solution which is easily solidified.

[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
And at least two systems of nozzles 1 for discharging the respective medicines from the ends of the first and second flow paths 11 and 12 to the outside of the apparatus body 10.
5 and 16 are formed in the apparatus main body 10, and means for closing one of the nozzles so as to be openable and closable by an on-off valve 19 is provided.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
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.

[0007] For the injection operation by the present apparatus, an injection hole is provided to a required depth. In order to install the outer pipe 30, boring is performed by means such as digging a casing, and the hole 3 is formed.
1 is filled with the seal grout 32, and is immediately inserted while adding the sleeve pipe 33. Thereafter, the casing pipe is pulled out. Reference numeral 34 denotes 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 a sleeve tube 33 called an outer tube.

[0008] The drug solution to be injected is of a type in which at least two kinds of drug components are mixed. Since one kind of chemical solution alone does not cure, handling is remarkably facilitated. In many cases, usable chemical solutions are provided as a two-component mixed type. For example, there are epoxy-based ones and water-glass ones, and any of them can be used in the present invention. The drug component may be a mixed type of a liquid and a solid (for example, a powder). Among the usable chemicals, commercially available ones are represented by trade names, such as hard riser, Nutite, MG Lock, and Sekisui LG.

The main 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 having a plurality of packers 20a, 20b,..., Dividing a space S sealed by the adjacent packers 20a, 20b, and injecting a chemical solution into the space S. The packer has a structure capable of expanding and contracting (restoring) for sealing between the inside of the outer tube 30 and the outside of the apparatus main body 10. The dashed line 20 'in FIG. 1 is an exaggerated view of the state in which it has expanded and is in 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. Further, a fluid transfer path 22 for transferring a fluid for expanding the packer is also provided in the apparatus main body 10. And each flow path 11,
In order to prevent the first and second medicines supplied from the inside 12 from being brought into contact with the other medicine other than at the time of injection, or from flowing back through the other flow paths 11 and 12, mutually independent first flow A passage 11 and a second passage 12 are provided in the main body 10 of the apparatus.

The first flow path 11 and the second flow path 12 are independent up to their respective ends, and their ends communicate with nozzles 15 and 16 which are outlets to the outside of the main body. That is, at least two kinds of medicines are mixed outside the apparatus main body 10, and this point is a feature of the present invention. The way of providing the plurality of flow paths 11, 12,... Is arbitrary. The arrangement of a parallel or multi-tube structure is common, but in the latter case, the inner passage is provided in the outer passage, so that it is easy to adapt even when the apparatus main body 10 cannot be made thick.

In the illustrated embodiment, the first flow path 11 and the second flow path
And the flow path 12 are arranged substantially concentrically. If the first flow path 11 has a large diameter,
The end is a first nozzle chamber 23 leading to the first nozzle 15.
And the end of the small-diameter second flow path 12 ends in a second nozzle chamber 24 communicating with the second nozzle 15. The first channel 11 has the first drug, and the second channel 12 has the second drug.
Pour the medicine.

In the embodiment, a bendable flexible tube portion 21 is connected between a plurality of packers 20a and 20b so that the injection device can be easily inserted even if the outer tube 30 has a locally bent portion. It has a simple structure. In such a case, it is preferable that each of the flow paths 11, 12,... Is terminated before (upstream side) the flexible pipe section 21. In some cases, the flexible tube 21 is unnecessary.

Each of the nozzles 15, 16,... Ejects a chemical solution into a space sealed by a packer 17 outside the apparatus main body 10, and one or more nozzles are provided. The illustrated nozzles 15 and 16 are provided closest to the most downstream of the respective nozzle chambers 23 and 24. The illustrated device body 10 includes an outer tube 30.
It is elongated in the axial direction so as to be inserted into the inside, and has a structure in which a plurality of nozzles 15 and 16 are provided radially outward around the axis to radially eject a chemical solution.

One of the nozzles is opened and closed by an on-off valve 19. This is to prevent one of the chemicals once ejected out of the apparatus main body from entering the inside from the other nozzle and solidifying. Therefore, the on-off valve 19 prevents one of the chemicals from entering from the outside, and can be opened by the outflow pressure of the other chemical. To achieve this purpose, in the case of the embodiment, a sleeve 25 made of rubber is fitted to a portion 26 provided with the nozzle 15 on the outer surface of the first main body, and the upstream side thereof is stopped by a fixture 27 to constitute the on-off valve 19. . That is, although the downstream side of the sleeve 25 is opened by the internal pressure,
Invasion of a chemical solution or the like from the outside can be prevented. The sleeve 25 only needs to be openable and closable by an elastic structure, and the material thereof may be rubber or other synthetic resin. The fitting portion 26 of the sleeve 25 is formed in a concave shape to keep the outer shape smooth.

The fluid transport path 22 for expanding or restoring the above-mentioned packers is provided with respective packers 20a, 20b.
It is led to the inside of ... The fluid can be a liquid or a gas, but air has been used successfully in embodiments. Further, the apparatus main body 10 is structurally divided into several parts, and a sealing means 36 is provided at each connection part to obtain a liquid-tight and air-tight effect. In addition, illustration is not necessarily reproduction of a faithful shape structure. The first and second flow paths 11 and 12 are introduced into the main body from the connector 37 at the upper end, and thereafter are provided with a meandering to provide a space for the connection portion 38 of the fluid conveyance path 22 and reduce the outer diameter of the main body. It is kept within a certain range.

The thus configured chemical injection device is inserted into the outer tube 30 formed as described above from the distal end portion 39. Then, it is stopped at a predetermined position, and the packers 20a are expanded so as to be in close contact with the inside of the outer tube 30, so that the space S between the adjacent packers 20a and 20b is shut off from above and below. When the medicine is pumped from the first flow path 11 and the second flow path 12, the first medicine and the second medicine (main agent and curing agent) are ejected from the nozzles 15 and 16 to the outside, and the space is removed. It is mixed with S, and penetrates into the ground from cracks formed outside beforehand by cracking by water pushing.

If the supply of the first or second chemicals is stopped after the above-mentioned chemical liquid injection work is completed, the two chemicals are not mixed, and one of the chemicals that have once exited to the main body of the apparatus. There is no intrusion into the interior of the liquid crystal 10 and contact with the other chemical. Therefore, the hardened component does not remain in the apparatus main body, and only one of the chemicals remains, so that the hardened component does not harden and can be easily removed if necessary.

[0019]

Since the present invention is constructed and operates as described above, at least two kinds of components can be uniformly mixed and permeated into the ground in a state where the performance of the chemical solution is sufficiently brought out. 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. In particular, according to the device of the present invention,
Since the two kinds of medicines are mixed outside the apparatus main body 10, an effect is obtained that a quick-curing medicine having a remarkably short reaction time can be used remotely.

[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 a mixing unit to a nozzle.

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

Claims (5)

(57) [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 tube with the chemical solution, wherein at least two 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
And at least two systems of nozzles 1 for discharging the respective medicines from the ends of the first and second flow paths 11 and 12 to the outside of the apparatus body 10.
A chemical injection device characterized in that 5 and 16 are formed in the device main body 10 and one of the nozzles is closed by an on-off valve 19 so that the nozzle can be opened and closed. 2. The chemical solution according to claim 1, wherein the apparatus main body 10 has a plurality of packers 20a, 20b... Provided at intervals in the longitudinal direction, and a bendable flexible tube portion 21 between the packers. Infusion device. 3. The apparatus main body 10 has a plurality of packers 20a, 20b... Provided at intervals in the longitudinal direction, and has a structure in which nozzles 15, 16 are provided between each packer.
The drug solution injector according to any one of the preceding claims. 4. An on-off valve 19 closes at least one of nozzles 15 and 16 provided on the apparatus main body 10 so as to be openable and closable,
2. The liquid injector according to claim 1, wherein the liquid injector has an elastic structure which is pushed open by an increase in pressure of the liquid. 5. The chemical according to claim 1, wherein at least the first flow path 11 and the second flow path 12 have a multi-tube structure in which one flow path is guided into the other flow path. Infusion device.