JP2009226317A - Underground insertion gadgetry - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underground insertion gadgetry which does not cause a local increase of the expansion coefficient of an expansion tube and has good durability. <P>SOLUTION: The underground insertion gadgetry 1 is inserted into a boring pipe 23 penetrated underground, and an underground operation comprising supply of a cleaning agent to polluted soil or water absorption of ground water is carried out through a through-hole 23a of the boring pipe 23. The gadgetry has the first circulation tube, the second circulation tubes 7a, 7b and 7c, an outer tube 3 and two or more expansion tubes engaged in the outer periphery of the outer tube 3 at a predetermined gap. Compartments 13a, 13b, 13c and 13d separated airtightly from the outside are formed in each expansion tube by binding both ends of each expansion tube airtightly to the outer periphery of the outer tube 3. With the gadgetry 1 intercalated into the boring pipe 23 and each expansion tube expanded, an underground operation is carried out through the through-hole 23a of the boring pipe 23 and the second circulation tubes 7a, 7b and 7c. Expansion tubes are each covered airtightly with covering tubes 6a, 6b, 6c and 6d made of an elastic material. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an underground insertion tool for inserting into a borehole penetrating into the ground and performing at least one of supplying a cleaning agent to contaminated soil and collecting groundwater.

In the conventional underground insertion tool shown in Patent Document 1, one fluid circulation pipe and one air supply pipe are arranged in parallel, and a plurality of expansion pipes are vertically arranged on the outer peripheral side of both pipes. It is configured as a mobile unit that is spaced apart. The movable body unit is inserted into the purification borehole, and any desired one of the plurality of communication holes provided at predetermined intervals in the longitudinal direction of the purification borehole is vertically adjacent. After positioning between the expansion tubes, air is supplied to the plurality of expansion tubes via the air supply tube, the plurality of expansion tubes are expanded, and the plurality of expansion tubes are pressed against the inner peripheral surface of the borehole tube. Then, the ozone gas supplied through the fluid circulation pipe is supplied to the ground through the communication hole of the borehole located between the upper and lower adjacent expansion pipes to perform the purification work. A plurality of expansion tubes of such a conventional underground insertion tool are rubber tubes in which both ends are fitted to outer peripheral portions of a pair of upper and lower caps in which a fluid circulation tube and an air supply tube are fixed in parallel. Therefore, a closed space that is kept secret is formed in the tube by binding the fitting portions of the tubes with annular fastening members.
JP 2007-61663 A

In conventional underground insertion tools, the larger the gap between the inner diameter of the borehole and the outer diameter of the expansion tube, the easier it is to insert the underground insertion tool into the borehole, so to ensure a sufficient gap between the borehole bore diameter, The outer diameters of the plurality of expansion tubes before being expanded were formed to be relatively small compared to the inner diameter of the borehole.
Therefore, when the plurality of expansion tubes are expanded until the outer peripheral surfaces of the plurality of expansion tubes are pressed against the inner peripheral surface of the borehole with a predetermined surface pressure, the outer circumference of the expansion tube pressed against the inner peripheral surface of the borehole Since the diameter of the portion cannot be increased any more, a part of the expansion tube enters the gap between the outer peripheral surface of the pair of upper and lower caps and the inner peripheral surface of the borehole tube, and the expansion tube tries to expand further locally. Such a locally expanded portion has a larger expansion rate than the outer peripheral portion of the expansion tube pressed against the inner peripheral surface of the borehole, so that the expansion tube can be expanded by using the underground insertion tool for a long time. When the diameter reduction is repeated many times, fine cracks are likely to occur. Such cracked parts will deteriorate when exposed to ozone gas over a long period of use, eventually opening a hole, and will no longer function as an expansion tube, improving the durability of the underground insertion tool. It was decreasing.

  The present invention was made to solve such problems, and the outer diameter of the expansion tube was formed to be small so as to ensure a sufficient gap between the outer diameter of the expansion tube before expanding and the inner diameter of the borehole tube. Even in such a case, the expansion coefficient of the expansion tube is not locally increased, and an object of the present invention is to provide a durable underground insertion tool.

  In order to achieve this object, the underground insertion tool according to the present invention is inserted into a borehole penetrating into the ground and contaminated soil through a through-hole drilled in a midway portion in the longitudinal direction of the borehole. An underground insertion tool for performing underground work of at least one of supply of a purification agent to or absorption of groundwater, and a first distribution pipe and a second distribution pipe arranged in parallel, and these A plurality of fixing members that integrally fix the flow pipe and a flexible elastic material that is disposed at a predetermined interval along the longitudinal direction of each flow pipe and is fitted to the outer periphery of the fixing member Each of the plurality of expansion pipes is airtightly bound to the outer periphery of the fixing member, thereby forming compartments that are airtightly partitioned from the outside in each of the expansion pipes. The first distribution pipe corresponding to each expansion pipe has a second A communication hole is formed in each of the second flow pipes, and a second communication hole is formed in a portion between the expansion pipes adjacent to each other in the longitudinal direction of the second flow pipe. The expansion tube is expanded or contracted by supplying a fluid to each of the compartments through or discharged from each of the compartments, and the underground insertion tool is inserted into the borehole Underground work in which the underground work is performed through the through hole of the borehole tube and the second communication hole of the second flow pipe located between adjacent expansion pipes in a state where the diameter of each expansion pipe is expanded. In the insertion tool, at least a portion of each expansion tube to be expanded or contracted is hermetically covered with a cladding tube made of a flexible elastic material.

  The underground insertion tool according to the invention described in claim 2 is the underground insertion tool according to claim 1, wherein the expansion tube is expanded or contracted before the fluid is supplied to the respective compartments. Each expansion tube is formed so that the inner diameter of the portion to be made is substantially the same as the outer diameter of the fixing member, while the outer diameter of the cladding tube before the coating of each expansion tube is the borehole tube In the state where each expansion tube is formed in advance so as to be substantially the same as the inner diameter of each of the expansion tubes and the expansion tubes are hermetically covered with the cladding tubes, the spaces between the respective cladding tubes and the respective expansion tubes are maintained at a negative pressure. It is characterized by being.

  The underground insertion tool according to the invention described in claim 3 is the underground insertion tool according to claim 1 or 2, wherein both ends of the respective expansion tubes and the respective cladding tubes are overlapped. The outer peripheral portions of both end portions of each of the cladding tubes are bound by an annular fastening member, and the expansion tubes and the cladding tubes are both bound to the outer peripheral portion of the fixing member. It is.

  The underground insertion tool according to the invention described in claim 4 is the underground insertion tool according to any one of claims 1 to 3, wherein the fixing member is a cylindrical outer tube, The outer pipe, the first flow pipe, and the second flow pipe are integrated by filling and solidifying the gap between the first flow pipe and the second flow pipe in the outer pipe. Each of the plurality of expansion tubes is fitted to the outer periphery of the outer tube at a predetermined interval in the longitudinal direction of the outer tube. Both ends are tightly bound to the outer periphery of the outer tube, and compartments partitioned airtightly from the outside are formed in the gaps between the plurality of expansion tubes and the outer tube, respectively. Third communication holes communicating the respective compartments with the inside of the outer pipe are respectively provided in the corresponding parts of the outer pipe. A fourth communication hole that communicates the inside and the outside of the outer tube at a portion of the outer tube between the expansion tubes adjacent to each other in the longitudinal direction of the outer tube. And each of the compartments and the first circulation pipe communicate with each other through the third communication hole, and the second communication pipe and the fourth communication hole communicate with each other through the second communication hole. It is characterized by.

  According to the present invention, since at least the portion of each expansion tube of the underground insertion tool to be expanded or contracted is airtightly covered with the cladding tube made of a flexible elastic material, the expansion tube before the expansion is performed. Even if the outer diameter of the expansion tube is made small so as to ensure a sufficient gap between the outer diameter of the test tube and the inner diameter of the borehole, each expansion tube is restrained by the cladding tube when the expansion tube is expanded. Since the diameter of the expansion tube is expanded, a part of the expansion tube is not significantly expanded than the other part, and the expansion rate of the expansion tube is not locally increased. Can be secured sufficiently.

According to the second aspect of the present invention, the cladding tube is formed in advance so that the outer diameter before coating each expansion tube is substantially the same as the inner diameter of the borehole tube. Since the space between each expansion tube and each cladding tube is maintained at a negative pressure in a state where the tube is hermetically covered, the outer diameter of the cladding tube is reduced before the expansion tube is expanded. Since it is smaller than the inner diameter of the borehole, the underground insertion tool can be inserted into the borehole without trouble.
In addition, when expanding the diameter of each expansion tube within the borehole, the diameter of the cladding tube is also restricted by the borehole tube, so that the diameter of the cladding tube is expanded only to a previously formed outer diameter. The expansion coefficient does not change when viewed from the cladding tube. As a result, it is possible to sufficiently ensure the durability of the cladding tube, and thus the underground insertion tool.

  According to the third aspect of the present invention, the expansion tube and the cladding tube are both bound to the outer peripheral portion of the fixing member by being bound by the tightening member. The number of man-hours for the binding operation and the number of parts of the underground insertion tool can be reduced as compared with the case of using the fastening members.

  According to the invention of claim 4, the fixing member is composed of a cylindrical outer tube and a filler made of a resin or the like that integrates the outer tube, the first flow tube, and the second flow tube. The outer tube, the first flow tube, and the second flow tube can be firmly integrated, and thus the underground insertion tool can be made robust.

  In addition, since both ends of each expansion tube are tightly bound to the outer periphery of the outer tube and a compartment is formed in the gap between each expansion tube and the outer tube, when the expansion tube is covered with the cladding tube, Fit each cladding tube to each expansion tube in diameter and in close contact with the outer tube, and press the outer peripheral surface of each fitted cladding tube toward each expansion tube to reduce the diameter. By covering each expansion tube with the tube in an airtight manner and then releasing the pressure on each cladding tube, the space between each expansion tube and each cladding tube can be easily maintained at a negative pressure. Also, when the outer peripheral surface of each cladding tube is pressed to the side of each expansion tube to reduce the diameter, each expansion tube is regulated by the outer tube and will not be reduced in diameter from the outer diameter of the outer tube. An outer peripheral surface can be firmly pressed to each expansion tube side, and a space between each expansion tube and each cladding tube can be in a favorable negative pressure state.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a side view showing a configuration of an underground insertion tool according to an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are taken along arrows AA and BB in FIG. FIG. 2C is an enlarged cross-sectional view along arrows C1-C1, arrow C2-C2, arrow C3-C3, and arrow C4-C4 in FIG. 3 (d), (e), and (f) are enlarged sectional views taken along arrows DD, EE, and FF in FIG. 1, respectively, and FIG. It is sectional drawing which follows the arrow GG of a). What is shown with the code | symbol 1 in FIG. 1 has shown the underground insertion tool by this embodiment. In addition, since this underground insertion tool 1 is long, for convenience of drawing, in FIG. 1, it is divided into two at the middle part in the longitudinal direction and shifted to the left and right.

  This underground insertion tool 1 is inserted into a later-described borehole 23 penetrating into the underground M, and at least any one of supply of a purifier to contaminated soil or water absorption of groundwater through a through-hole 23a of the borehole 23. It is for doing one of the underground work. The underground insertion tool 1 includes one cylindrical outer tube 3 made of iron or stainless steel and four pieces fitted on the outer periphery of the outer tube 3 at a predetermined interval in the longitudinal direction of the outer tube 3. Expansion tubes 5a, 5b, 5c, 5d, four cladding tubes 6a, 6b, 6c, 6d fitted to the outer circumferences of these expansion tubes 5a, 5b, 5c, 5d, respectively, and three second tubes Distribution pipes 7a, 7b, 7c and one first distribution pipe 9 are provided.

  The first circulation pipe 9 and the second circulation pipes 7a, 7b, 7c are arranged in parallel. The interval between the four expansion tubes 5a, 5b, 5c, 5d and the cladding tubes 6a, 6b, 6c, 6d in the longitudinal direction of the outer tube 3 is provided with through-holes 23a ... It is the same as the interval. The second flow pipes 7 a, 7 b, 7 c and the first flow pipe 9 are inserted into the outer pipe 3 at the other end side in a state in which one end side protrudes from one end side of the outer pipe 3. The second flow pipes 7a, 7b, 7c and the first flow pipe 9 are made of iron or stainless steel cylindrical pipes having the same inner diameter and outer diameter. Thus, the expansion pipes 5a, 5b, 5c, 5d and the cladding pipes 6a, 6b, a predetermined distance along the longitudinal direction of the first flow pipe 9 and the second flow pipes 7a, 7b, 7c. 6c and 6d are arranged.

  Each expansion tube 5a, 5b, 5c, 5d and each cladding tube 6a, 6b, 6c, 6d are made of a flexible elastic material (for example, rubber material) that can be expanded in diameter, and the expansion tubes 5a, 5b, 5c, 5d and the cladding tubes 6a, 6b, 6c, 6d have substantially the same length. The second flow pipes 7a, 7b, 7c, the first flow pipe 9 and the outer pipe 3 are firmly and integrally formed by a filler Q made of a resin such as an epoxy resin that is filled in the gap between them and solidified. Fixed and integrated. The outer tube 3 and the solidified filler Q constitute a “fixing member” in the present invention.

  The outer peripheral portions of both ends of each of the covering tubes 6a, 6b, 6c, 6d are annular in a state where both ends of each of the expansion tubes 5a, 5b, 5c, 5d and each of the covering tubes 6a, 6b, 6c, 6d are overlapped with each other. The expansion pipes 5a, 5b, 5c and 5d and the respective cladding pipes 6a, 6b, 6c and 6d are both tightly and tightly bound to the outer peripheral portion of the outer pipe 3 by the tightening member 11. Thus, annular compartments 13a, 13b, 13c and 13d are formed in the gaps between the expansion tubes 5a, 5b, 5c and 5d and the outer tube 3 so as to be airtightly partitioned from the outside (see FIG. 2 (c) and see FIG. 8). Air is supplied to each compartment 13a, 13b, 13c, 13d (which constitutes “fluid” in the present invention), and the supplied air is discharged from each compartment 13a, 13b, 13c, 13d. 5a, 5b, 5c, 5d are expanded or contracted.

  Each of the expansion tubes 5a, 5b, 5c, 5d has an inner diameter that is substantially the same as the outer diameter of the outer tube 3 (preferably slightly larger than the outer diameter of the outer tube 3). Dimension). For this reason, in the state before supplying air to each compartment 13a, 13b, 13c, 13d and expanding each expansion pipe 5a, 5b, 5c, 5d, the diameter of each expansion pipe 5a, 5b, 5c, 5d is expanded. Alternatively, the inner diameter of the portion to be reduced is substantially the same as the outer diameter of the outer tube 3.

  As shown in FIG. 6, the intermediate portions in the longitudinal direction of the respective cladding tubes 6a, 6b, 6c, 6d have outer diameters in the state before coating the respective expansion tubes 5a, 5b, 5c, 5d at both ends. Compared to the large diameter, it is formed in advance. The outer diameter of the intermediate portion of each cladding tube 6a, 6b, 6c, 6d formed to have a large diameter is formed in advance so as to be approximately the same as the inner diameter of the test tube 23 described later. , 6b, 6c, 6d have substantially the same inner diameters as the outer diameters of the respective expansion tubes 5a, 5b, 5c, 5d (preferably slightly larger than the outer diameters of the respective expansion tubes 5a, 5b, 5c, 5d). Is formed.

  In a state where the expansion tubes 5a, 5b, 5c, and 5d are tightly bound by the tightening member 11 and the expansion tubes 5a, 5b, 5c, and 5d are hermetically covered by the respective cladding tubes 6a, 6b, 6c, and 6d, the respective cladding tubes 6a, 6b, 6c, and 6d Spaces between the expansion tubes 5a, 5b, 5c, and 5d are held at a negative pressure, and the cladding tubes 6a, 6b, 6c, and 6d approach the outer peripheral surfaces of the expansion tubes 5a, 5b, 5c, and 5d. The diameter is always reduced in the direction.

  In the longitudinal direction of the outer tube 3, the expansion tube 5a, 5b, 5c, 5d and the portion of the outer tube 3 between the respective cladding tubes 6a, 6b, 6c, 6d are communicated with each other inside and outside the outer tube 3. The fourth communication holes 15a, 15b, 15c are formed respectively. On the other hand, third communication holes 16a, 16b for communicating the respective compartments 13a, 13b, 13c, 13d and the inside of the outer tube 3 are provided at portions of the outer tube 3 corresponding to the respective expansion tubes 5a, 5b, 5c, 5d. 16c and 16d are formed corresponding to the respective compartments 13a, 13b, 13c and 13d.

  Second communication holes 17a, 17b, and 17c are formed in the middle portions in the longitudinal direction of the second flow pipes 7a, 7b, and 7c, respectively, between the adjacent expansion pipes 5a, 5b, 5c, and 5d. The second flow pipes 7a, 7b, 7c and the fourth communication holes 15a, 15b, 15c are individually communicated with each other. Specifically, the second flow pipe 7a communicates with the fourth communication hole 15a through the second communication hole 17a formed in the second flow pipe 7a, and the second flow pipe 7b is formed in the second flow hole 7b. The second flow pipe 7b and the fourth communication hole 15b communicate with each other through the communication hole 17b, and the second flow pipe 7c and the fourth through the second communication hole 17c formed in the second flow pipe 7c. The communication hole 15c is in communication (see FIG. 3).

  Further, first through holes 18a, 18b, 18c, 18d are formed in the first flow pipes 9 corresponding to the respective expansion pipes 5a, 5b, 5c, 5d, and the third communication holes 16a. , 16b, 16c, and 16d, the compartments 13a, 13b, 13c, and 13d communicate with the inside of the first flow pipe 9, respectively. Specifically, the inside of the first flow pipe 9 is communicated with the third communication hole 16a and the compartment 13a through the first series of through holes 18a, and the inside of the first flow pipe 9 and the first through the first series of through holes 18b. The three communication holes 16b and the compartment 13b communicate with each other, the first communication pipe 9 communicates with the third communication hole 16c and the compartment 13c through the first series of holes 18c, and the first series of holes 18d pass through. The first communication pipe 9 communicates with the third communication hole 16d and the compartment 13d (see (c) of FIG. 2). Air is supplied to each compartment 13a, 13b, 13c, 13d via the first series of through holes 18a, 18b, 18c, 18d of the first flow pipe 9, and the supplied air is supplied to each compartment 13a, 13b, 13c, 13d. Each of the expansion tubes 5a, 5b, 5c, 5d is expanded or contracted by being discharged from.

  A cylindrical plug member 19 made of a resin material such as vinyl chloride is fitted to the other end side (the lower end side in FIG. 1) of the outer tube 3 in a state of being bonded by an adhesive, and the other end of the outer tube 3 The side opening is sealed (see FIG. 4). A cylindrical plug member 21 made of a resin material such as vinyl chloride is used as an adhesive on the other end side (the lower end side in FIG. 1) of each of the second flow pipes 7a, 7b, 7c and the first flow pipe 9. And the openings on the other end side of the respective flow pipes 7a, 7b, 7c, 9 are respectively sealed (see FIG. 4).

(Manufacturing process of underground insertion tool 1)
The underground insertion tool 1 is manufactured by the following process.
(1) Prepare four thin tubes of the same length that will constitute the second flow pipes 7a, 7b, 7c and the first flow pipe 9 of the underground insertion tool 1.
(2) The stopper member 21 is coated with an adhesive in the opening at one end of each of the four capillaries, and the openings at the ends of the four capillaries are sealed.

  (3) The four capillaries whose one ends are tightly plugged by the plug member 21 are bound and bound with a wire in a state where the positions of the respective ends in the longitudinal direction are aligned. At this time, the four capillaries are arranged in parallel, and the four capillaries are bundled so that a substantially square apex is formed by the four shaft cores when viewed from the direction along the shaft cores of the capillaries. Then, these four tubules are integrated with each other by applying an adhesive to several places in the middle in the longitudinal direction and joining them together, and then the wire is removed.

  Instead of binding and binding the four capillaries with a wire, as shown in FIG. 5, a holding member 22 formed in a shape substantially along the shape of the space surrounded by the four capillaries S is provided. Alternatively, the holding member 22 and the four capillaries may be integrated by bonding four capillaries to the four groove portions 22a of the holding member 22 with an adhesive. In this case, the holding member 22 may be formed to have a length slightly shorter than the four capillaries, and the one holding member 22 may be disposed over substantially the entire length of the four capillaries. The plurality of formed holding members 22 may be arranged in a scattered manner at several positions with a certain interval in the longitudinal direction of the four capillaries.

  (4) The number of the four thin tubes integrated in the step (3) in the middle in the longitudinal direction inside one thick tube constituting the outer tube 3 of the underground insertion tool 1 After inserting while applying the adhesive to the location, four thin tubes are bonded to the inner wall of the thick tube and temporarily fixed. In this step, the plug member 19 is fitted into the opening of the other end of the large tube at the tip of one end of the four narrow tubes inserted from one end of the large tube (the side sealed by the plug member 21). In anticipation of being inserted, the other end side of the four narrow tubes is one end side of the thick tube while being inserted from the other end of the thick tube to a position having a margin slightly longer than the fitting length of the plug member 19 It is in a state of protruding from.

(5) From the respective positions of the thick tube at the other end side of the four thin tubes projecting from one end side of the thick tube and the one end side of the four thin tubes visible from the opening on the other end side of the thick tube, After drawing the position of the axis of the four narrow tubes as viewed from the outer peripheral surface with a writing instrument on the outer peripheral surface of the thick tube, the fourth communication holes 15a, 15b, 15c and the third communication holes 16a, 16b, 16c, 16d is marked with a writing instrument at the position of the outer peripheral surface of the thick pipe to be drilled.
(6) The stopper member 19 is applied and fitted with an adhesive into the opening at the other end of the thick tube, and the opening at the other end of the thick tube is sealed.

(7) A filler material Q made of an epoxy resin or the like is injected from an opening at one end of the thick tube, and the filler material Q is filled in the gap between the four narrow tubes and the thick tube. By solidifying, the gap between the four thin tubes and the large tube is hermetically maintained by the filler Q, and the four thin tubes and the large tube are firmly integrated.
(8) The drill tip of the drilling tool is positioned at each position on the outer peripheral surface of the thick pipe marked in the step (5), and the tip of the drill enters the narrow pipe through the thick pipe and the thin pipe. As a result, the fourth communication holes 15a, 15b, and 15c and the second communication holes 17a, 17b, and 17c are coaxially formed at a time, and the third communication holes 16a, 16b, 16c, and 16d are connected to the first communication hole. The holes 18a, 18b, 18c, and 18d are formed coaxially at once. Thus, the thick tube is configured as the outer tube 3, and the four narrow tubes are configured as the second distribution tubes 7a, 7b, 7c and the first distribution tube 9, respectively.

  (9) The expansion tubes 5a, 5b, 5c and 5d are fitted to the outer periphery of the outer tube 3 at the respective portions where the third communication holes 16a, 16b, 16c and 16d are formed. Four cladding tubes 6a, 6b, 6c, and 6d are fitted to the outer circumferences of the respective expansion tubes 5a, 5b, 5c, and 5d that have been reduced in diameter and are in close contact with the outer tube 3. And in the state which piled up both ends of each expansion tube 5a, 5b, 5c, 5d and each coating tube 6a, 6b, 6c, 6d, it is on the outer peripheral part of the one end part of each coating tube 6a, 6b, 6c, 6d. After the fastening members 11 are fitted, the expansion pipes 5a, 5b, 5c, 5d and the cladding pipes 6a, 6b, 6c, 6d are applied to the outer peripheral surfaces of the fastening members 11 by a compressor. Are tightly bound to the outer periphery of the outer tube 3 together.

(10) The outer peripheral surface of each cladding tube 6a, 6b, 6c, 6d is pressed to the expansion tube 5a, 5b, 5c, 5d side to reduce the diameter, and each cladding tube 6a, 6b, 6c, 6d and each expansion tube The air existing in the space between 5a, 5b, 5c and 5d is discharged to the outside.
(11) In the state where the other end portions of the respective expansion tubes 5a, 5b, 5c, 5d and the respective cladding tubes 6a, 6b, 6c, 6d are overlapped, the other end portions of the respective cladding tubes 6a, 6b, 6c, 6d The other fastening member 11 is fitted to the outer peripheral portion. Then, a compression force is applied to the outer peripheral surface of the tightening member 11 by a compressor so that each of the expansion pipes 5a, 5b, 5c, 5d and each of the cladding pipes 6a, 6b, 6c, 6d is an outer peripheral part of the outer pipe 3. After tightly and tightly binding, the pressure on each of the cladding tubes 6a, 6b, 6c, 6d is released. Thereby, the space between each expansion tube 5a, 5b, 5c, 5d and each cladding tube 6a, 6b, 6c, 6d is kept at a negative pressure.
The underground insertion tool 1 is manufactured by the above process.

  (12) Finally, high-pressure air is supplied to the second flow pipes 7a, 7b, 7c and the first flow pipe 9, respectively, and both ends of the expansion pipes 5a, 5b, 5c, 5d and the second flow pipes. The pipe 7a, 7b, 7c and the first circulation pipe 9 are inspected for abnormal air leakage from the outer peripheral portion or the like. This inspection is performed by putting the underground insertion tool 1 in water, so that it is possible to easily determine whether or not there is an abnormal air leak depending on whether or not bubbles are generated from an unexpected location.

(Groundwater collection method)
Next, an example of a method for collecting groundwater to investigate the degree of soil contamination in the ground using the underground insertion tool 1 will be described with reference to FIGS. FIG. 7 is a partial cross-sectional view showing a state in which groundwater is collected, with a part broken away, and FIG. 8 shows the expansion tube 5a, FIG. 9 is a partial cross-sectional view showing a state in which the diameters of 5b, 5c, and 5d are expanded by breaking the borehole tube 23, and FIG. 9 (h) is an arrow view H1-H1, an arrow view H2-H2, in FIG. FIG. 9J is an enlarged cross-sectional view taken along arrows H3-H3 and H4-H4. FIG. 9J corresponds to FIG. 9H, and expands the expansion tubes 5a, 5b, 5c, and 5d. FIG. 10 is an enlarged cross-sectional view showing a state before diametering, and FIG. 10 is an enlarged cross-sectional view taken along line KK in FIG. For the convenience of drawing, FIG. 8 shows the figure divided into two at the middle in the longitudinal direction and shifted to the left and right.

  In order to investigate the degree of contamination, the borehole 23 is inserted into the hole drilled in the ground by the borehole device, the borehole 23 is inserted into the underground M, and then the underground insertion tool 1 is inserted into the borehole 23. . The borehole 23 has a plurality of through holes 23a in the middle in the longitudinal direction at predetermined intervals in the longitudinal direction, and adjacent to each of the expansion tubes 5a, 5b, 5c, 5d. The underground insertion tool 1 is inserted into the borehole 23 so that the through hole 23a is positioned between the expansion tubes.

  One end of an air supply pipe 27 is connected to the first flow pipe 9 of the underground insertion tool 1 via a pipe joint, and an air supply device 29 is connected to the other end of the air supply pipe 27. One end of each of the flow pipes 31a, 31b, 31c is connected to the second flow pipes 7a, 7b, 7c of the underground insertion tool 1 via pipe joints, and the other ends of the flow pipes 31a, 31b, 31c. The part is connected to the water absorption device 30. The water absorption device 30 can arbitrarily select any one of the three distribution pipes 31a, 31b, and 31c and absorb water only through the selected distribution pipe.

  Thus, by operating the air supply device 29, the air supply pipe 27, the first flow pipe 9, the first series of through holes 18a, 18b, 18c, 18d and the third communication holes 16a, 16b, 16c, 16d The predetermined high-pressure air is supplied to the compartments 13a, 13b, 13c, 13d formed in the respective gaps between the expansion tubes 5a, 5b, 5c, 5d and the outer tube 3 through the compartments 13a, 13b. , 13c and 13d are held at a predetermined pressure. As a result, the diameters of the expansion tubes 5a, 5b, 5c, and 5d are expanded, whereby the outer peripheral surfaces of the cladding tubes 6a, 6b, 6c, and 6d are held in a state of being pressed against the inner peripheral surface of the borehole tube 23. The

Next, the water absorbing device 30 is operated, and first, the flow pipe 31a is selected, and groundwater is collected through the flow pipe 31a. Following the collection, the flow pipe 31b is selected and the flow pipe 31b is selected. After collecting groundwater through the flow pipe 31c, the flow pipe 31c is selected and the groundwater is collected through the flow pipe 31c. FIG. 7 shows a state in which groundwater is collected through the through-hole 23a of the borehole 23 located between the cladding tubes 6b and 6c, the second flow tube 7b, and the flow tube 31b.
When collecting groundwater at a deeper depth in the ground M, the operation of the air supply device 29 is stopped, the air pressure in the compartments 13a, 13b, 13c, 13d is lowered, and the expansion pipes 5a, 5b , 5c, 5d.

  Next, when ground water is collected through the flow pipe 31c, the space between the cladding tubes 6a and 6b is reduced to one through hole 23a below the through hole 23a of the borehole 23 located between the cladding tubes 6c and 6d. The underground insertion tool 1 is moved downward in the borehole 23 so as to be positioned. In this case, it is needless to say that the borehole 23 is longer than the underground insertion tool 1 so that the underground insertion tool 1 can be moved downward. By collecting such groundwater, groundwater from a shallow part to a deep part of the underground M is collected, and the collected groundwater is put in a separate container for each depth of the underground M.

  In addition, when there is almost no groundwater in the underground M, a water supply device (on the ground) via at least one of the second circulation pipes 7a, 7b, 7c of the underground insertion tool 1 ( Water is supplied from (not shown), and the supplied water is absorbed by the water absorption device 30 via at least one of the second circulation pipes 7a, 7b, and 7c. At this time, the water supply and the water absorption are the water absorption after a certain time has passed after the water supply, or through any one of the second distribution pipes 7a, 7b, 7c. The water may be supplied through another flow pipe at the same time as the water is supplied.

When the collection of groundwater is completed, the underground insertion tool 1 is once extracted from the borehole 23, but may be kept inserted in consideration of the subsequent purification work.
Since the pollutant is dissolved in the groundwater collected from the underground M where the soil is polluted by pollutants including trichlorethylene, tetrachlorethylene, etc., the concentration of the pollutant dissolved in the groundwater is measured by a measuring device. By measuring, the state of soil contamination for each depth of the underground M can be grasped.

(Purification method of contaminated soil)
Next, an example of a method for purifying contaminated soil in the ground using the underground insertion tool 1 will be described with reference to FIG. FIG. 11 is a partial cross-sectional view showing a state in which the underground M is being purified, with a part broken away.
After measuring the concentration of the pollutant in the collected groundwater, the state of soil contamination at each depth of the underground M can be grasped, and then each other end of the flow pipes 31a, 31b, 31c is removed from the water absorption device 30 and the water absorption Instead of the device 30, the other end portions of the flow pipes 31a, 31b, 31c are connected to the purification device 33. The purification device 33 is a device for supplying a purification gas containing ozone as a composition gas to the underground M. The purification device 33 can arbitrarily select any one of the three flow pipes of the flow pipes 31a, 31b, 31c and supply the purification gas only through the selected flow pipe. it can.

  In the state where the operation of the air supply device 29 is stopped and the expansion pipes 5a, 5b, 5c, 5d are reduced in diameter, the underground pipe reaches the site of the through hole 23a of the borehole 23 located at the depth of the contaminated underground M. The insertion tool 1 is inserted into the borehole 23. Then, the air supply device 29 is operated to supply predetermined high-pressure air to the compartments 13a, 13b, 13c, 13d formed in the respective gaps between the expansion tubes 5a, 5b, 5c, 5d and the outer tube 3. Then, the expansion chambers 5a, 5b, 5c, and 5d are expanded in diameter while the compartments 13a, 13b, 13c, and 13d are maintained at a predetermined pressure.

Next, the purification device 33 is operated to supply the purification gas to the underground M through the through hole 23a of the borehole 23 located at the depth of the contaminated underground M. In FIG. 11, the through hole 23a of the borehole 23 located at the depth of the contaminated underground M is positioned between the cladding tubes 6b and 6c, and the fourth communication hole 15b of the outer tube 3 positioned therebetween, A state is shown in which the purification gas is supplied through the second flow pipe 7b and the flow pipe 31b communicating with the four communication holes 15b.
When the soil is contaminated over a wide depth in the ground M, the underground insertion tool 1 is appropriately moved in the borehole 23 to supply the purification gas in the same manner as the above-described groundwater collection operation. To do.

  Further, when the soil of the underground M is contaminated over a wide area, a plurality of boreholes 23 are inserted into the contaminated area at an appropriate interval, and then the boreholes 23 are inserted. Are inserted into the underground insertion tool 1 and the air supply device 29 and the purification device 33 are connected to the insertion tool 1 through the air supply pipe 27 and the flow pipes 31a, 31b, 31c, respectively. Purifying gas is supplied to the underground M through 31b and 31c and the underground insertion tool 1. At that time, if the degree of soil contamination differs depending on the location and depth of the underground M, the supply amount or supply time per unit time of the purification gas to be supplied is set for each insertion tool 1 in each place or in the insertion tool 1 in each place. The purifying gas is supplied by appropriately adjusting the flow pipes 31a, 31b, 31c.

  According to the underground insertion tool 1 configured as described above, the three second flow pipes 7a, 7b, 7c and the fourth communication holes 15a, 15b, 15c are individually communicated with each other. When the underground insertion tool 1 is inserted into the borehole 23 penetrating into the middle M and at least one of the supply of the purification agent to the contaminated soil and the recovery of the groundwater is performed, the operation is performed for each second. This can be done individually for each of the distribution pipes 7a, 7b, 7c. For this reason, after selecting one of the three second flow pipes 7a, 7b, and 7c and performing operations such as supplying a purifier, the same is performed by switching to another second flow pipe. By performing the work, the work can be performed over a certain depth of the underground M without frequently moving the underground insertion tool 1 in the borehole 23, which is complicated. You do n’t have to.

  Further, according to the underground insertion tool 1 according to this embodiment, the gap between the outer pipes 3 is filled with the filler Q made of a resin such as an epoxy resin, and the three second flow pipes 7a, 7b, 7c, one first flow pipe 9 and the outer pipe 3 are integrated, and then the second communication holes 17a, 17b and 17c are formed coaxially with the respective fourth communication holes 15a, 15b and 15c. Are formed in the second flow pipes 7a, 7b, 7c, respectively, while the third continuous holes 18a, 18b, 18c, 18d are formed coaxially with the third communication holes 16a, 16b, 16c, 16d, respectively. Since the first flow pipe 9 is drilled by a tool, the fourth communication holes 15a, 15b, 15c and the plurality of second flow pipes 7a, 7b, 7c are individually communicated with each other. 13a, 13b, 13c, 13d and first distribution And 9 communicating the manufacturing process is simplified to pass respectively, correspondingly, it is possible to reduce the manufacturing cost.

  Further, according to the underground insertion tool 1 according to this embodiment, the portion of the expansion tube 5a, 5b, 5c, 5d of the underground insertion tool 1 that is to be expanded or contracted is made of a flexible elastic material. Since each of the cladding tubes 6a, 6b, 6c, and 6d is hermetically coated, the expansion tube has a sufficient clearance between the outer diameter of the expansion tubes 5a, 5b, 5c, and 5d before the diameter expansion and the inner diameter of the borehole tube 23. Even when the outer diameters of 5a, 5b, 5c, and 5d are formed to be small, each expansion pipe 5a, 5b, 5c, and 5d is restricted by the cladding pipes 6a, 6b, 6c, and 6d when the diameter is expanded. Since the expansion pipes 5a, 5b, 5c and 5d are expanded in diameter, a part of the expansion pipes 5a, 5b, 5c and 5d is remarkably expanded from the other parts, and the expansion rate of the expansion pipes 5a, 5b, 5c and 5d is local. Expansion tube 5a, 5b, 5c, d, by extension, it is possible to sufficiently ensure the durability of the ground insertion tool 1.

  In addition, according to the underground insertion tool 1 according to this embodiment, the outer diameter of the cladding tubes 6a, 6b, 6c, and 6d before covering the expansion tubes 5a, 5b, 5c, and 5d is a borehole. In the state where each expansion tube 5a, 5b, 5c, 5d is airtightly covered with the cladding tubes 6a, 6b, 6c, 6d, the expansion tubes 5a, 5b, Since the spaces between 5c, 5d and the respective cladding tubes 6a, 6b, 6c, 6d are held at negative pressure, in the state before the expansion tubes 5a, 5b, 5c, 5d are expanded, Since the outer diameter of each of the cladding tubes 6a, 6b, 6c, 6d is smaller than the inner diameter of the borehole 23, the underground insertion tool 1 can be inserted into the borehole 23 without any trouble.

  Further, when the diameters of the respective cladding tubes 6a, 6b, 6c, and 6d are expanded by expanding the diameters of the respective expansion tubes 5a, 5b, 5c, and 5d in the borehole 23, they are regulated by the borehole 23 and formed in advance. Since the cladding tubes 6a, 6b, 6c, and 6d only expand to the outer diameter, the expansion coefficient does not change when viewed from the previously formed cladding tubes 6a, 6b, 6c, and 6d. As a result, it is possible to sufficiently ensure the durability of the cladding tubes 6a, 6b, 6c, 6d, and thus the underground insertion tool 1.

  Further, according to the underground insertion tool 1 according to this embodiment, the expansion members 5a, 5b, 5c, 5d and the respective cladding tubes 6a, 6b, 6c, 6d are both bound by the fastening member 11 and the outer tube. 3, the expansion pipes 5 a, 5 b, 5 c, 5 d and the respective cladding pipes 6 a, 6 b, 6 c, 6 d are respectively bound by separate fastening members 11, It is possible to reduce the number of man-hours for binding and the number of parts of the underground insertion tool 1.

  Further, according to the underground insertion tool 1 according to this embodiment, the “fixing member” referred to in the present invention is integrated with the outer tube 3, the second flow tubes 7 a, 7 b, 7 c and the first flow tube 9. Since it is composed of the filler Q made of resin or the like and the outer pipe 3, the outer pipe 3, the second flow pipes 7a, 7b, 7c, and the first flow pipe 9 can be firmly integrated. The underground insertion tool 1 can be made robust.

  Further, both end portions of each of the expansion tubes 5a, 5b, 5c and 5d are airtightly bound to the outer periphery of the outer tube 3, and a compartment 13a is formed in a gap between each of the expansion tubes 5a, 5b, 5c and 5d and the outer tube 3. , 13b, 13c, and 13d are formed, and when the expansion tubes 5a, 5b, 5c, and 5d are covered with the cladding tubes 6a, 6b, 6c, and 6d, the respective expansions in a state where the diameter is reduced and the outer tubes 3 are in close contact with each other. The cladding tubes 6a, 6b, 6c, 6d are fitted to the tubes 5a, 5b, 5c, 5d, and the outer peripheral surfaces of the fitted cladding tubes 6a, 6b, 6c, 6d are connected to the expansion tubes 5a, 5b, After the pipes 6a, 6b, 6c, 6d are air-tightly covered with the cladding tubes 6a, 6b, 6c, 6d in a state where the diameters are reduced by pressing toward the 5c, 5d side, the cladding tubes 6a, 6b, 6c are respectively covered. , 6d to release the expansion tubes 5a, 5b, 5c, 5d and the respective cladding tubes a, 6b, 6c, it can be held easily vacuum the space between the 6d.

  Further, when the outer peripheral surfaces of the respective cladding tubes 6a, 6b, 6c and 6d are pressed toward the respective expansion tubes 5a, 5b, 5c and 5d to reduce the diameter, the respective expansion tubes 5a, 5b, 5c and 5d are the outer tubes 3. Therefore, the outer peripheral surface of each of the cladding tubes 6a, 6b, 6c, and 6d is firmly pressed toward the expansion tubes 5a, 5b, 5c, and 5d. The space between each expansion pipe 5a, 5b, 5c, 5d and each cladding pipe 6a, 6b, 6c, 6d can be made into a favorable negative pressure state.

  The above-described embodiment is an example for explaining the present invention, and the present invention is not limited to the above-described embodiment, and the invention can be read from the whole of the claims and the specification. Changes can be made as appropriate without departing from the gist or concept, and the underground insertion tool after such change is also included in the technical scope of the present invention.

For example, in the above-described embodiment, the respective covering tubes 6a, 6b, 6c, 6c, 6d, 6d, 6d, 6d, 6d, 6d, 6d, 6d, 6d, 6d, 6d The outer peripheral portions of both end portions of 6d are bound by a common fastening member 11, and the expansion tubes 5a, 5b, 5c, 5d and the respective cladding tubes 6a, 6b, 6c, 6d are all bound to the outer peripheral portion of the outer tube 3. Thus, the example in which the portions of the expansion tubes 5a, 5b, 5c, and 5d that are to be expanded or contracted are hermetically covered by the cladding tubes 6a, 6b, 6c, and 6d, respectively, has been shown. Without being constrained by such a configuration, both ends of each expansion tube 5a, 5b, 5c, 5d are respectively fastened to the outer periphery of the outer tube 3 by fastening members, and then each expansion tube 5a, 5b, 5c and 5d are each completely covered with a cladding tube, and each cladding tube Both ends were tied by a separate fastening member, it may be tied to each cladding tube in intimate contact directly to the outer periphery of the outer tube 3.
In the above-described embodiment, the example in which the four expansion tubes 5a, 5b, 5c, and 5d are attached to the outer tube 3 has been described. However, the present invention is not limited to such a configuration, and the expansion tube And the thing of the structure which decreased the number of the cladding tube and the 2nd distribution | circulation pipe | tube one by one may be used.

  Conversely, the outer tube 3 is made of a longer tube material, and five or more expansion tubes and cladding tubes are attached to the outer peripheral portion of the outer tube 3. The number of the third communication holes and the first series of holes formed in each of the first flow pipes 9 is 5 or more, and the number of the second flow pipes disposed in the outer pipe 3 and the outer pipes 3 and The number of the fourth communication holes and the number of the second communication holes respectively drilled in the second flow pipe may be four or more. In this case, the second flow pipe and the first flow pipe are arranged in parallel in the outer pipe 3, and the apex of a substantially regular polygon is formed by each axis when viewed from the direction along the axis of the pipe. In this manner, the second flow pipe and the first flow pipe are arranged along the inner peripheral surface of the outer pipe 3. By doing so, the second communication hole can be drilled in the second flow pipe by the drilling tool coaxially with each of the fourth communication holes, respectively, and with respect to each third communication hole A first series of through holes can be formed coaxially in the first flow pipe with a drilling tool.

  By configuring the underground insertion tool 1 in this way, the number of second distribution pipes that can be appropriately selected and used in the operation of supplying the purification agent to the contaminated soil or collecting the groundwater increases, and the borehole The frequency with which the underground insertion tool 1 is moved within the 23 is further reduced.

  In the above-described embodiment, air is supplied into the compartments 13a, 13b, 13c, 13d formed in the respective gaps between the expansion tubes 5a, 5b, 5c, 5d and the outer tube 3 to expand the expansion tubes. Although the example which expands the diameter of 5a, 5b, 5c, 5d was shown, it replaced with air and supplied the fluid which consists of other gas, such as nitrogen gas, or liquid, such as water or hydraulic fluid, and each expansion pipe 5a, 5b, The diameters of 5c and 5d may be expanded.

  In the above-described embodiment, the “fixing member” referred to in the present invention is a filler made of a resin or the like that integrates the outer pipe 3, the second flow pipes 7 a, 7 b, 7 c and the first flow pipe 9. Although an example in which Q and the outer tube 3 are configured has been shown, instead of this, a “fixing member” as used in the present invention is a plurality of cylindrical caps having a plurality of through holes (shown in Patent Document 1). It may be equivalent to a base of a conventional underground insertion tool. In this case, eight bases are provided at appropriate intervals, and the second flow pipes 7a, 7b, 7c and the first flow pipe 9 are individually inserted into the through holes of the bases, respectively. 7a, 7b, 7c and the first flow pipe 9 and the respective through holes are hermetically sealed, while the caps are fitted in the pipes at both ends of the respective expansion pipes 5a, 5b, 5c, 5d. The both ends of each of the cladding tubes 6a, 6b, 6c, 6d in a state where the respective cladding tubes 6a, 6b, 6c, 6d are fitted to the respective expansion tubes 5a, 5b, 5c, 5d and the both ends thereof are overlapped with each other. The expansion pipes 5a, 5b, 5c, 5d and the respective cladding pipes 6a, 6b, 6c, 6d are both tightly and tightly tied to the outer circumference of the base.

FIG. 1 is a side view showing a configuration of an underground insertion tool according to an embodiment of the present invention. 2 (a) and 2 (b) are enlarged sectional views taken along arrows AA and BB in FIG. 1, respectively, and FIG. 2 (c) is an arrow C1-C1 in FIG. It is an expanded sectional view which follows arrow C2-C2, arrow C3-C3, and arrow C4-C4. (D), (e), (f) of FIG. 3 is an expanded sectional view which respectively follows arrow DD in FIG. 1, arrow EE, and arrow FF. FIG. 4 is a cross-sectional view taken along the arrow GG in FIG. FIG. 5 is an enlarged cross-sectional view showing an example of fixing the second flow pipe and the first flow pipe with a holding member interposed. FIG. 6 is an enlarged cross-sectional view showing a state in which the cladding tube is broken at a plane passing through the axis. FIG. 7 is a partial cross-sectional view showing a state in which groundwater is collected, with a part broken away. FIG. 8 is a partial cross-sectional view showing a state in which the underground insertion tool is inserted into the borehole and the diameter of the expansion tube is expanded, with the borehole broken. (H) in FIG. 9 is an enlarged cross-sectional view along arrows H1-H1, arrows H2-H2, arrows H3-H3, and arrows H4-H4 in FIG. 8, and (j) in FIG. It is a figure corresponding to (h) of, and is an expanded sectional view showing a state before expanding an expansion pipe. FIG. 10 is an enlarged cross-sectional view along the line KK in FIG. FIG. 11 is a partial cross-sectional view showing a state in which the underground is being purified, with a part broken away.

Explanation of symbols

1 Underground insertion tool 3 Outer tube (fixing member)
5a expansion pipe 5b expansion pipe 5c expansion pipe 5d expansion pipe 6a coating pipe 6b coating pipe 6c coating pipe 6d coating pipe 7a second flow pipe 7b second flow pipe 7c second flow pipe 9 first flow pipe 11 fastening member 13a partition Chamber 13b Partition chamber 13c Partition chamber 13d Partition chamber 15a Fourth communication hole 15b Fourth communication hole 15c Fourth communication hole 16a Third communication hole 16b Third communication hole 16c Third communication hole 16d Third communication hole 17a Second communication hole 17b Second communication hole 17c Second communication hole 18a First series of holes 18b First series of holes 18c First series of holes 18d First series of holes 23 Borehole 23a Through hole M Underground Q Filler (fixing member)

Claims (4)

Inserted into a borehole penetrating into the ground and supplied with a purifying agent to contaminated soil or absorbed groundwater through a through-hole drilled in a midway in the longitudinal direction of the borehole An underground insertion tool for performing work,
A first distribution pipe and a second distribution pipe arranged in parallel;
A fixing member for integrally fixing these flow pipes;
A plurality of expansion tubes made of a flexible elastic material, arranged at predetermined intervals along the longitudinal direction of each of the flow tubes, and fitted to the outer periphery of the fixing member;
By tightly binding each end of each of the plurality of expansion tubes to the outer periphery of the fixing member, each of the expansion tubes forms a compartment that is airtightly partitioned from the outside.
Drilling a first series of through holes in the first flow pipe corresponding to each expansion pipe,
Drilling a second communication hole in a portion between the adjacent expansion pipes in the middle in the longitudinal direction of the second flow pipe,
The fluid is supplied to the compartments through the first through-holes of the first flow pipe and the fluid supplied is discharged from the compartments to expand or contract the diameter of the expansion pipes.
In a state where the underground insertion tool is inserted into the borehole and the diameter of each expansion pipe is expanded, the second communication between the through hole of the borehole and the second flow pipe positioned between adjacent expansion pipes In the underground insertion tool that performs the underground work through a hole,
An underground insertion tool characterized in that at least a portion of each expansion tube to be expanded or contracted is hermetically covered with a cladding tube made of a flexible elastic material. The underground insertion tool according to claim 1,
In the state before supplying the fluid to each compartment, while forming each expansion tube so that the inner diameter of the portion to be expanded or contracted of each expansion tube is substantially the same as the outer diameter of the fixing member,
The cladding tube is formed in advance so that the outer diameter in a state before coating each expansion tube is substantially the same as the inner diameter of the borehole tube,
An underground insertion tool, wherein a space between each of the covering tubes and each of the expansion tubes is maintained at a negative pressure in a state where each of the expansion tubes is air-tightly covered with the covering tube. The underground insertion tool according to claim 1 or 2,
In a state where both ends of each expansion tube and each cladding tube are overlapped, the outer peripheral portions of both ends of each cladding tube are fastened by an annular fastening member, and each expansion tube and each cladding tube are An underground insertion tool characterized in that both are fixed to the outer peripheral portion of the fixing member. In the underground insertion tool according to any one of claims 1 to 3,
The fixing member is filled in a gap between the outer tube and the tube in a state where the first outer tube and the second tube are disposed inside the outer tube and the outer tube. The first flow pipe and the second flow pipe are composed of a filler made of resin or the like, and
Fitting the plurality of expansion tubes to the outer periphery of the outer tube at a predetermined interval in the longitudinal direction of the outer tube,
Each end of each of the plurality of expansion tubes is airtightly bound to the outer periphery of the outer tube, and a compartment chamber that is airtightly partitioned from the outside is provided in each gap between the plurality of expansion tubes and the outer tube. Forming,
A third communication hole communicating each of the compartments and the inside of the outer tube is formed in each portion of the outer tube corresponding to each expansion tube,
In the longitudinal direction of the outer tube, in the portion of the outer tube between the adjacent expansion tubes, a fourth communication hole that communicates the inside and the outside of the outer tube is formed,
While each of the compartments and the first circulation pipe communicate with each other through the first series of holes and the third communication hole,
An underground insertion tool characterized in that the inside of the second flow pipe and the fourth communication hole communicate with each other through the second communication hole.

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