Injection inner pipe, injection device equipped with same, and purification method

Abstract

To provide a new purification technique of a contaminated soil where a double packer construction method is applied.SOLUTION: Disclosed is an injection inner tube 10 constituting an injection device for purification of a contaminated soil, and to be inserted into an injection outer tube which is to be inserted into a drill hole formed in the contaminated soil. The injection inner tube 10 is assembled with: an inner tube main body 20 integrating a double tube and capable of double liquid injection; a packer mechanism for expanding and shrinking packer parts 30, 40 arranged on upper and lower sides thereof; and a nozzle 50 formed between the upper and lower packer parts 30, 40 for ejecting an injection liquid. Also, a gap between the upper and lower packer parts 30, 40 is made to be 23-27 cm.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a technology for purifying contaminated soil (polluted soil). [Background technology]

[0002] A purification method that applies the "double packer method," which is a type of chemical injection method, has already been developed and put into practice (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-80484 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the double packer method generally only allows injection of one type of purification material at a time. If two types of purification materials can be injected at once, it would be possible to inject the Fenton purification material (hydrogen peroxide + ferrous sulfate) in one step. Also, if two types of purification materials could be injected simultaneously, it would be possible to apply it to other purification materials.

[0005] Therefore, the inventors of the present application have carried out intensive testing and research, and have now completed a new purification technology that applies the double packer method. [Means for solving the problem]

[0006] The first invention constitutes an injection device for purifying contaminated soil, and is characterized in that it is an inner injection tube inserted into an outer injection tube which is inserted into a hole drilled in the contaminated soil, and is equipped with an inner tube body which incorporates a double tube and is capable of injecting two liquids, a packer mechanism which expands and contracts the packer parts arranged above and below it, and a nozzle formed between the upper and lower packer parts to spray the injection liquid, and the spacing between the upper and lower packer parts is set to 23cm to 27cm. Here, the two liquids in "two liquids pourable" may be either different liquids or the same liquid. The second invention constitutes an injection device for purifying contaminated soil, and is characterized in that it comprises an inner injection tube inserted into an outer injection tube which is inserted into a hole formed in the contaminated soil, the inner tube body incorporating a single tube and capable of injecting one liquid, a packer mechanism for expanding and contracting packer parts arranged above and below the inner tube, and a nozzle formed between the upper and lower packer parts for spraying the injection liquid, the spacing between the upper and lower packer parts being set to 23 cm to 27 cm. A third invention is an injection device comprising the inner injection tube according to the first or second invention. The fourth invention is a purification method for purifying contaminated soil, which uses an outer injection pipe inserted into a hole drilled in the contaminated soil, and an inner injection pipe which is inserted into the outer injection pipe and which is equipped with an inner pipe body incorporating a double pipe and capable of injecting two liquids, a packer mechanism which expands and contracts the packer parts arranged above and below the inner pipe, and a nozzle formed between the upper and lower packer parts to spray the injection liquid, and which is equipped with an inner pipe having a double pipe built in and capable of injecting two liquids, and which is inserted into the outer injection pipe, and which is characterized by the fact that the distance between the upper and lower packer parts of the inner injection pipe is set to 23 cm to 27 cm, and the injection work is repeated while stepping up inside the outer injection pipe, thereby purifying the contaminated soil. The fifth invention is a purification method for purifying contaminated soil, which uses an outer injection pipe inserted into a hole drilled in the contaminated soil, and an inner injection pipe equipped with an inner pipe body incorporating a single pipe and capable of injecting one liquid, a packer mechanism for expanding and contracting the packer parts arranged above and below the inner pipe, and a nozzle formed between the upper and lower packer parts for spraying the injection liquid, which is inserted into the outer injection pipe, and is characterized in that the distance between the upper and lower packer parts of the inner injection pipe is set to 23 cm to 27 cm, and the injection work is repeated while stepping up inside the outer injection pipe, thereby purifying the contaminated soil. Effect of the Invention

[0007] The present invention has the following advantages. (1) Even if the current inner injection pipe with packer is simply designed to be capable of injecting two liquids, it is not suitable for the purification method. The purification of contaminated soil will be uneven, and practical purification cannot be realized. (2) However, by setting the distance between the upper and lower packers of the inner injection pipe to 25 cm ± 2 cm as in the present invention, the contaminated soil can be purified finely, and uniform purification that can withstand practical use can be achieved. (3) In addition, the previous purification method using two types of chemicals required each chemical to be injected separately, making the purification process lengthy. (4) However, if the present invention has a structure that allows two liquids to be injected simultaneously and separately, it is possible to combine the two steps into one, thereby shortening the purification process. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is an explanatory diagram showing an inner injection tube according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing an inner injection tube according to the present invention. As shown in Fig. 1, the inner injection pipe 10 according to the present invention includes an inner pipe body 20 that incorporates a double pipe and can inject two liquids. Reference numerals 21 and 22 denote injection hose connectors that are connected to piping that supplies the purification material from a liquid tank (not shown) that stores the purification material via a pump device (not shown). The two purification liquids required for purification are supplied from this injection hose connector and mixed inside the inner pipe body 20.

[0010] The inner injection pipe 10 also includes packer sections 30, 40 disposed above and below the inner pipe body 20. Reference numeral 31 denotes a packer hose connection section, which is connected so as to allow fluid to flow in and out of the packer sections 30, 40 and constitutes a packer mechanism that expands and contracts the packers 30, 40.

[0011] Furthermore, a nozzle 50 is formed between the upper and lower packer portions 30, 40 in order to eject the grout mixed within the inner pipe body 20. The inner injection pipe 10 is characterized in that the distance X between the upper and lower packer parts 30, 40 is in the range of "23 cm to 27 cm."

[0012] The shorter this interval X is, the more precise the purification can be, but the lower the work efficiency is. This is because the injection work is repeated while stepping up the inside of the drilled hole at this interval X. For this reason, the inventors of the present application conducted extensive testing and research to find the optimal interval X, and derived that the optimal interval X for purification efficiency and work efficiency is "25cm±2cm".

[0013] The above has been described with reference to the inner pipe body 20 incorporating a double pipe and capable of injecting two liquids, but the same is basically true for an inner pipe body incorporating a single pipe and capable of injecting one liquid. [Industrial Applicability]

[0014] The present invention can be widely used as a purification technology for contaminated soil using the double packer method. [Explanation of symbols]

[0015] 10: Injection inner tube 20: Inner tube body 21: Injection hose connection 22: Injection hose connection 23: Head 24:Adjustment tube 25: Plug 30: Packer part (upper part) 31: Packer hose connection 40: Packer part (lower part) 50: Nozzle X: Packer spacing

Claims

1. An injection device for purifying contaminated soil, comprising an injection inner tube inserted into an injection outer tube inserted into a drilled hole formed in the contaminated soil, The device is provided with an inner pipe body incorporating a double pipe for supplying two cleaning liquids from a liquid tank storing the cleaning material via a pump device and capable of injecting the two cleaning liquids by mixing them inside the inner pipe body, a packer mechanism for expanding and contracting packer parts arranged above and below the inner pipe body, and a nozzle formed between the upper and lower packer parts for spraying the mixed injection liquid inside the inner pipe body, The inner injection pipe is characterized in that the interval between the upper and lower packer parts is set to 23 cm to 27 cm.

2. An injection device comprising the inner injection tube according to claim 1.

3. A method for purifying contaminated soil, comprising the steps of: This purification method uses an outer injection pipe that is inserted into a drilled hole in the contaminated soil, and an inner injection pipe that is inserted into the outer injection pipe and is equipped with an inner pipe body that incorporates a double pipe that supplies two purification liquids from a liquid tank that stores purification materials via a pump device and is capable of injecting the two liquids by mixing them inside, a packer mechanism that expands and contracts the packer parts arranged above and below, and a nozzle formed between the upper and lower packer parts to spray the injection liquid mixed inside the inner pipe body, and a packer mechanism that expands and contracts the packer parts arranged above and below the inner pipe, and a nozzle formed between the upper and lower packer parts to spray the injection liquid mixed inside the inner pipe body, with the spacing between the upper and lower packer parts of the inner injection pipe set to 23 cm to 27 cm, and the injection work is repeated while stepping up inside the outer injection pipe to purify the contaminated soil.

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