JP2009243143A - Water supply/drainage apparatus for water sealing borehole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water supply/drainage apparats for a water sealing borehole which apparats facilitates work of inserting a packer hose into the borehole to locate the packer hose at a target position 3 to 4 meters away from an opening of a water sealing tunnel or a position close to the target position and sealing up the water sealing borehole. <P>SOLUTION: According to the water supply/drainage apparats 16 with the packer hose 18 for the water sealing borehole 12, an external drainage pipe 50 is of a divided structure consisting of a fixed pipe 50A in the packer hose 18 and an extension pipe 50B outside the packer hose 18 that are connected to each other. An internal pipe is not fixed to the packer hose 18, and an extension portion of the internal pipe outside the packer hose 18 is connected/fixed to an end of the extension pipe 50B of the external pipe 50. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  This invention is for sealing a water sealing borehole provided in a rock in the ground in a sealed state on the opening side, supplying water for water sealing into the borehole, and taking out excess water. The present invention relates to a water supply / drainage device for a water sealing boring hole with a packer hose.

LPG (liquefied petroleum gas) used in Japan largely relies on imports, and it is envisaged to store a certain amount of LPG from the viewpoint of ensuring the stability of supply under such circumstances.
LPG stockpiling methods (same for crude oil stockpiling) include a ground tank system and a water-sealed underground rock tank system that stores LPG in a hollow of a rock mass dug underground.

  With the water-sealed underground rock tank system, there is no equipment or other restrictions as with the above-ground tank system, so it is possible to create a large-capacity facility. It has advantages such as being less affected by natural disasters, and stockpiling is currently underway using this water-sealed underground bedrock tank system.

  The principle of this water-sealed underground bedrock tank system is that the bedrock tank is installed deeper than the groundwater level (at a depth of 150m or more below ground), and LPG in a high pressure state is contained in the bedrock tank by the pressure of the surrounding groundwater ( Water seal).

In order to store LPG in a rock tank, a high pressure of about 1 MPa or more is required at room temperature, and LPG in the rock tank in a high pressure state tends to leak outside through a crack in the rock.
In the water-sealed underground bedrock tank system, the groundwater pressure around the bedrock tank is kept higher than the LPG storage pressure, and the leakage of LPG that propagates through the cracks is prevented by the groundwater flow in the bedrock toward the bedrock tank.

  By the way, if the surrounding groundwater flows into the bedrock tank through the crack of the bedrock, the groundwater level decreases and it becomes difficult to maintain the groundwater pressure.

  Therefore, in this method, as shown in FIG. 6, in order to maintain the groundwater level around the rock tank 200 and secure the flow of the groundwater, a water-sealing tunnel (water-sealed tunnel) is formed at the upper periphery of the rock tank 200. 202, and a number of bore holes 204 for water sealing (holes having a long diameter of about 90 mm and a length of about 60 m) are drilled in the bedrock from the tunnel 202 for water sealing. 204 is systematically arranged, and water is artificially supplied into the borehole 204 to seal a rock crack through the borehole and to secure a groundwater flow toward the rock tank 200. The water sealing function of LPG to the bedrock tank 200 is secured.

Here, the water is supplied to the boring hole 204 by utilizing the height difference from the ground through the vertical pipe 206.
The high-pressure water supplied to the boring hole 204 is injected into a crack or the like in a natural mountain (rock mass), and the LPG is sealed in the rock mass tank 200 by the groundwater flow toward the rock mass tank 200.
The present inventor has devised and proposed a water supply / drainage device with a packer hose for supplying water for sealing water to the boring hole 204 and discharging excess water from the boring hole 204 (Patent Document 1 below). ).
FIG. 7 shows a specific example thereof.

In the figure, 204 is a water sealing boring hole, and 210 is its water supply / drainage device. The water supply / drainage device 210 has a packer hose 212 and a water supply / drainage pipe 214 having a double pipe structure.
The packer hose 212 is provided through the rubber expansion tube 216, a pair of end members 218 and 220 attached to each end thereof, and the end member 220, and a pressurized fluid is provided inside the rubber expansion tube 216. The rubber expansion tube 216 is expanded in the radial direction by introducing a pressurized fluid, and is brought into close contact with the inner surface of the boring hole 204, so that the boring hole 204 is opened on the opening side. Close to seal.

The water supply / drainage pipe 214 having a double-pipe structure has an inner pipe 224 for water supply and an outer pipe 226 for drainage, and is fixed to the packer hose 212 in a state where they pass through the packer hose 212. Is provided.
Further, the outer tube 226 and the inner tube 224 are fixed to each other, and they form an integral structure.

The inner pipe 224 is provided with a water supply port 228 outside the left side of the packer hose 212 in the drawing, and the outer pipe 226 is provided with a drain port 230 outside the same side as the water supply port 228.
A tube 224A is connected to the inner tube 224 outside the packer hose 212 on the right side in the figure.
In the water supply / drainage device 210 with the packer hose, the boring hole 204 is closed in a sealed state by the packer hose 212, and water for water sealing is supplied through the water supply port 228.

  The supplied water is continuously supplied into the borehole 204 through the water supply passage 234 in the inner pipe 224. Excess water in the bore hole 204 is taken out to the outside of the left side of the packer hose 212 in the drawing through the annular drainage channel 236 between the inner tube 224 and the outer tube 226, and provided in the outer tube 226. It is discharged from the drain outlet 230.

By the way, it turned out that this boring hole water supply / drainage device 210 with a packer hose has the following problems.
When the water supply / drainage device 210 is installed, the packer hose 212 is inflated when it is located 3 to 4 m deep from the opening of the boring hole 204 and is in close contact with the inner surface of the boring hole 204 by a sealing action. Is preferably closed.

  The packer hose 212 is preferably inflated at a firm and firm location in the rock and closely attached to the inner surface of the boring hole 204. In this case, a portion near the opening of the boring hole 204, that is, a portion near the wall of the tunnel 202 for water sealing, The site is weak in strength and easily loses earth and sand. Therefore, the site where the packer hose 212 is installed is preferably a position 3 to 4 m deep from the opening of the boring hole 204 where the bedrock is strong and firm.

  However, in the case of the water supply / drainage device 210 shown in FIG. 7, the water supply / drainage pipe 214 having a double pipe structure of the inner pipe 224 and the outer pipe 226 is fixed to the packer hose 212, and the inner pipe 224 and the outer pipe 226 are rigidly fixed. Since it is an integral structure, it is difficult to push the packer hose 212 to a position 3 to 4 m behind the boring hole 204.

  In this case, it is conceivable that the water supply / drainage pipe 214 having a double-pipe structure is extended from the packer hose 212 to the left in the figure, but in this case, it is exposed to the outside from the packer hose 212 of the water supply / drainage pipe 214. The length of the part will be 3-4 m.

  On the other hand, the water sealing tunnel 202 has a narrow width of about 6 m, and a double pipe structure water supply / drainage pipe 214 extended from the inside of the water sealing tunnel 202 is pushed into the boring hole 204. Therefore, bringing the packer hose 212 to the target position is extremely difficult due to the narrow width of the tunnel 202, and it is impossible to actually perform such work in the tunnel 202 for water sealing. There is.

  Further, in the case of the water supply / drainage device 210 shown in FIG. 7, the tube 224 </ b> A is connected to the inner tube 224 fixed to the packer hose 212 on the right side in the figure, so that the packer hose 212 is connected to the borehole 204. When pushing to the position 3 to 4 m deeper, the tube 224 </ b> A must be performed, and there is a problem in terms of workability at that time.

JP 2005-23616 A

  The present invention is based on the circumstances as described above, and the packer hose can be easily inserted into the boring hole from the opening of the tunnel for water sealing to a target position of 3 to 4 m or its vicinity with good workability. The object of the present invention is to provide a water supply / drainage device for water sealing that can easily and easily close the borehole.

  Thus, according to the first aspect of the present invention, (a) (a) a rubber expansion tube, (b) an end member attached to each end of the rubber expansion tube, and (c) penetrating the end member Provided with a fluid introduction hole for introducing a pressurized fluid into the rubber expansion pipe, and the rubber expansion pipe is radially expanded by the introduction of the pressurized fluid to provide a water seal provided in the ground. A packer hose that closes the boring hole in a sealed state on the opening side, and (b) an inner pipe for water supply and an outer pipe for drainage. Provided in a state of penetrating the packer hose in the longitudinal direction, the inner pipe has a water supply port outside the opening side of the boring hole with respect to the packer hose, and the outer pipe has the same side as the water supply port The water outlet is provided outside, and the water sealing water supplied from the water supply port passes through the water supply channel inside the inner pipe. A water seal having a double-pipe structure water supply / drainage pipe that supplies water into the borehole, takes out excess water in the borehole through a drainage path between the inner pipe and the outer pipe, and discharges it from the drainage port. In the boring hole water supply / drainage device, the outer pipe is located in the packer hose, a fixed pipe fixed to the packer hose, and an external extension pipe on the drain outlet side separated from the fixed pipe The fixed pipe and the extension pipe are connected to the outside of the packer hose, while the inner pipe is inserted into the fixed pipe in a non-fixed state with respect to the packer hose, and the water supply side is connected. An extension part is passed through the extension pipe of the outer pipe outside the packer hose, and the end on the water supply port side is connected and fixed to the end of the extension pipe.

  According to a second aspect of the present invention, in the first aspect, the extension pipe of the outer pipe is formed by connecting a plurality of pipe bodies in the longitudinal direction with joints.

  According to a third aspect of the present invention, in any one of the first and second aspects, a water supply port member having the water supply port is connected and fixed to an end of the extension portion of the inner pipe, and the outer pipe A drain port member provided with the drain port is connected and fixed to the extension pipe, and the water supply port member and the drain port member are directly or via a joint forming the part of the extension pipe or the pipe body. The connection is fixed.

Effects and effects of the invention

  As described above, according to the present invention, the outer pipe for drainage in the water supply / drainage pipe having a double pipe structure is located in the packer hose, the fixed pipe fixed to the packer hose, and the drain outlet side separated from the fixed pipe As a divided structure with the external extension pipe, the fixed pipe and the extension pipe are connected to form the entire outer pipe, while the inner pipe for water supply is not fixed to the packer hose in the above state. Pass through the fixed pipe and pass the extension part on the water supply port side outside the packer hose and the inside of the extension pipe in the outer pipe so that the end part on the water supply port side is connected and fixed to the end part of the extension pipe It has been done.

In the present invention, since the water supply inner pipe is not directly fixed to the packer hose, the packer hose and the inner pipe can be independently pushed into the water sealing boring hole.
That is, when the packer hose is pushed into the boring hole, it is possible to push the packer hose alone without connecting the inner tube. Therefore, the work for pushing the packer hose can be easily performed with good workability.

  Thus, in the present invention, a long inner pipe (having a length of about 60 m), which is almost the same length as the water sealing boring hole, is pushed into the boring hole, and the packer hose is inserted into the boring hole at an appropriate depth. After being pushed into a position, for example, a position 3 to 4 m deep, by connecting the end of the inner pipe on the water inlet side to the end of the extension pipe configured separately from the fixed pipe in the outer pipe, A water supply / drainage pipe having a double pipe structure of an inner pipe and an outer pipe can be configured.

  In the present invention as described above, the distal end side of the inner tube is inserted into the fixed tube of the outer tube fixed to the packer hose, and the short tubes constituting the inner tube are successively formed using the fixed tube as a guide tube. The inner pipe of the entire required length can be configured by connecting it to the bore and feeding it into the borehole for water sealing while lengthening it, and inserting the inner pipe into the borehole at that time Can also be made easier.

In the present invention, the outer tube is divided into a fixed tube that is positioned in the packer hose and fixed to the packer hose, and an external extension tube on the drain outlet side, and the entire outer tube is connected by connecting them. Therefore, it is possible to configure such an extension pipe by connecting a large number of short pipe bodies (claim 2). In a narrow space with a small width in the sealing tunnel, the packer hose is gradually pushed deeply into the boring hole following the water sealing tunnel while connecting the short pipes one after another. In addition, the packer hose can be positioned.
Therefore, it is possible to easily push the packer hose into the boring hole even in a narrow water sealing tunnel.
As a result, the water supply / drainage device can be installed easily and easily with good workability even in a narrow water sealing tunnel.

In the present invention, a water supply port member having a water supply port is connected and fixed to the end of the extension portion of the inner pipe, while a drain port member having a drain port is connected and fixed to the extension pipe of the outer tube. The water supply port member and the drainage port member can be connected and fixed directly or via a joint or a pipe that forms a part of the extension pipe (claim 3).
By doing in this way, the part exposed to the exterior from the packer hose of the water supply / drainage pipe which makes a double pipe structure can be comprised easily.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, 10 is a water sealing tunnel, 12 is a long water sealing bore hole drilled in the rock G from the water seal tunnel 10, and 14 is an opening on the tunnel side of the bore hole.
Here, the boring hole 12 has a length of about 60 m.

Reference numeral 16 denotes a water supply / drainage device for the borehole 12 for supplying water to the borehole 12 and discharging excess water.
The water supply / drainage device 16 includes a packer hose 18 and a water supply / drainage pipe 20.
The packer hose 18 is positioned at a position where it enters the 3-4 m bore hole 12 from the opening 14 in FIG.

FIG. 4 specifically shows the configuration of the packer hose 18.
As shown in the figure, the packer hose 18 is attached to each end of the rubber expansion tube 22 and the rubber expansion tube 22, and a pair of end members 24 and 26 that close the openings at both ends of the rubber expansion tube 22. And have.
Here, the end members 24 and 26 are made of metal.

The rubber expansion tube 22 has a laminated structure of an inner rubber layer 28, a reinforcing layer 30, and an outer rubber layer 32.
The reinforcing layer 30 is configured by braiding reinforcing yarns. Here, as the braid, various braid structures such as a braid braid, a spiral braid, and a knit braid can be used. In some cases, a reinforcing layer having a comb structure in which reinforcing yarns are aligned in the longitudinal direction can be provided.

The pair of end members 24 and 26 are fitted into the ends of the rubber expansion tube 22.
Sawtooth-like engagement teeth 34 are provided on the outer peripheral surfaces of the fitting portions of the end members 24 and 26, and the end teeth 24 and 26 are bitten into the inner surface of the rubber expansion tube 32 by the engagement teeth 34. Is prevented from coming off from the rubber expansion tube 22.

Here, a stopper ring 47 is screwed to one end member 24.
The other end member 26 is provided with an introduction hole (fluid introduction hole) 36 for fluid (here, water) that penetrates the rubber expansion tube 32 in the longitudinal direction, and a joint 38 is provided in the introduction hole 36. A pressurizing tube 40 for supplying pressurized water is connected thereto.
That is, in this embodiment, pressurized water is supplied into the rubber expansion tube 18, and the rubber expansion tube 22 is expanded in the radial direction by the pressure of the pressurized water.

As shown in FIG. 4B, the end member 26 is provided with a through hole 42 in addition to the introduction hole 36. The through hole 42 is closed by a water stop plug 44. .
Reference numeral 46 denotes a metal fastening sleeve. By fastening the fastening sleeve 46, each end of the rubber expansion tube 22 is firmly fastened and fixed to each of the pair of end members 24 and 26 in a compressed state.

As shown in FIG. 4, the water supply / drainage pipe 20 has a double pipe structure of an inner pipe 48 for water supply and an outer pipe 50 for drainage.
Here, the inner pipe 48 for water supply consists of a tube made of resin (made of vinyl chloride, polyethylene, etc.).
The inner pipe 48 has a water supply passage 52 therein, and supplies water for water sealing into the boring hole 12 through the water supply passage 52.
On the other hand, the outer pipe 50 forms an annular drainage channel 54 between itself and the inner tube 48, and excess water in the water sealing water supplied into the borehole 12 is shown in the figure through the drainage channel 54. It is taken out leftward and discharged out of the boring hole 12.

  In this embodiment, the outer tube 50 is located in the packer hose 18 and is fixed to the packer hose 18 and extends from the packer hose 18 to the opening 14 side of the boring hole 12 as shown in FIG. The extended tube 50B is divided and connected to each other to constitute the entire outer tube 50.

Here, the fixed tube 50A is fitted into the fitting holes 56 penetrating the pair of end members 24, 26 in the packer hose 18, and is fixed to the end members 24, 26 by welding in this state. Has been.
The inner pipe 48 made of a resin tube is connected by a joint 57 (see FIG. 2) every about 3 to 4 m to constitute the whole.
That is, the inner pipe 48 is configured by connecting a large number of pipe bodies 58 with joints 57 over the entire length.
On the other hand, the extension pipe 50B in the outer pipe 50 is constituted as a whole by connecting a plurality of short pipe bodies 60 in the longitudinal direction by joints 61 and 62 as shown in FIG.

As shown in FIG. 3, the inner pipe 48 is provided with a water supply port 63 at the end of an extension 48 </ b> B that extends from the packer hose 18 to the outside and to the left in the drawing.
Reference numeral 64 denotes a joint as a water supply port member provided with the water supply opening 63. The joint 64 is connected to a resin tube via the joint 66, so that the water supply opening 63 is provided at the end of the extension portion 48B. Is provided.
On the other hand, the outer pipe 50 is provided with a drain port 68 at the end of the extension pipe 50B.

Reference numeral 70 denotes a joint as a drain outlet member that has a drain outlet 68 and forms a part of the extension pipe 50B. By connecting the joint 70, the extension pipe 50B is provided with the drain outlet 68.
Here, the joint 64 having the water supply port 63 and the joint 70 having the drain port 68 are connected to each other by an intermediate joint 72.
The intermediate joint 72 is also a part of the extension pipe 50B.

The intermediate joint 72 has tapered male threads 74 on one end side and the other end side in the axial direction, and the corresponding tapered female threads of the joints 64 and 70 are screwed onto the male thread 74. Thus, the joints 64 and 70 are connected in the axial direction via the intermediate joint 72.
In addition, the drain port 68 provided in the joint 70 faces the direction perpendicular to the longitudinal direction of the extension pipe 50B. On the other hand, the water supply port 63 faces the axial direction of the extension pipe 50B.

The joint 61 has a socket shape, and has a pair of tapered female threads 65 as shown in the partially enlarged view of FIG. 2, and a screw between the female threads 65 and the male threads of the adjacent pair of tube bodies 60. As a result, the pipe bodies 60 and 60 are connected.
The other joint 62 is a union joint, and this joint 62 has a pair of female screw members 76 and 78 and a cap nut 80 as shown in FIG.
The female screw members 76 and 78 are screwed into the male screws at the respective end portions of the adjacent tube bodies 60.

One female screw member 76 is provided with an outer flange portion 82 projecting radially outward, and the inner flange portion 84 of the cap nut 80 is engaged with the outer flange portion 82.
The other female screw member 78 has a male screw formed on the outer peripheral surface thereof, and the female screw of the cap nut 80 is screwed to the male screw.
As shown in FIG. 2, the joint 62 is located outside the boring hole 12 and connects the leftmost tube body 60 and the right tube body 60 in the drawing.
The other joint 61 is located in the boring hole 12 in the installed state.

The water supply / drainage device 16 of this embodiment can be installed in the boring hole 12 as follows.
That is, the inner pipe 48 in the water supply / drain pipe 20 having a double pipe structure is not connected to the packer hose 18, and the packer hose 18 is alone (however, the outer pipe 50 is fixed to the packer hose 18 at this time). The tube 50A is fixed) and is pushed into the borehole 12 little by little.

  Specifically, as shown in FIG. 5 (I), the shortest tube body 60 at the rightmost end in FIG. 2 is connected to a fixed tube 50A fixed to the packer hose 18 with a socket-like joint 61. In this state, the packer hose 18 is pushed from the opening 14 into the borehole 12 from the tunnel 10 for water sealing.

  Then, when the packer hose 18 is pushed into the boring hole 12 to some extent and enters, the second short tube body 60 is then connected by a joint 61 as shown in FIG. 18 is pushed further into the borehole 12 by the length of the short tube body 60.

Then, as shown in FIGS. 5 (III) and (IV), the packer hose 18 is pushed into the boring hole 12 little by little deeply while performing the same operation.
Then, the packer hose 18 is positioned in a target position in the boring hole 12, for example, at a position 3 to 4 m deep from the opening 14.

  In this state, pressurized water is introduced into the packer hose 12 and expanded in the radial direction, the packer hose 18, that is, the rubber expansion tube 32 is brought into close contact with the inner surface of the borehole 12, and the borehole 12 is sealed on the opening 14 side. Close to state.

The inner tube 48 can be installed in the boring hole 12 as follows.
That is, the length of the short pipe body 58 for constituting the inner pipe 48 shown in FIG. 2 is increased while being connected one after another by the joint 57, and the outer pipe is fixed to the packer hose 18. 50 fixed pipes 50A and extension pipes 50B connected thereto (specifically, the pipe body 60 constituting the pipes 50B) are inserted into the borehole 12 as a guide pipe.

  Then, the length is increased to nearly 60 m, that is, to the length of the boring hole 12, and when the tip finally hits the tip of the boring hole 12, this is slightly pulled back to the water sealing tunnel 10 side. .

  In this state, a joint 64 as a water supply port member having a water supply port 63 is connected and fixed to the end of the extension portion 48B of FIG. 3 in the inner pipe 48, and the joint 64 is also connected via an intermediate joint 72. Then, it is connected and fixed to a joint 70 having a drain outlet 68.

Then, the shortest tube body 60 at the left end in the drawing of the extension tube 50B is connected to the joint 70 via a female screw member 78, and then the left end tube body 60 is previously connected to a packer hose by a joint 62 formed of a union joint. The pipe body 60 connected to the 18 fixed pipes 50 </ b> A is connected to the leftmost end of the pipe body 60 outside the boring hole 12.
As a result, the entire inner tube 48 and outer tube 50 are formed, and at the same time, they are connected.

  After installing the water supply / drainage device 16 in this way, water for sealing water is supplied from the water supply port 63 of FIG. 3, and this is discharged from the inner pipe 48 B at the innermost tip position of the borehole 12. Supply water inside.

  The water that has flowed into the borehole 12 fills the borehole 12, and the excess water is directed leftward in the figure through an annular drainage channel 54 between the fixed pipe 50A and the inner pipe 48 in the outer pipe 50 fixed to the packer hose. And is discharged to the outside through a drain outlet 68 at the end of the extension pipe 50B in the outer pipe 50.

The supply of water for water sealing to the boring hole 12 by the water supply / drainage pipe 20 is continued even after the borehole 12 becomes full, and excessive water continues to be supplied thereafter. It is discharged to the outside through.
In this way, a continuous water flow is generated in the borehole 12, so that water for sealing is always supplied into the crack of the rock G.

The water supply / drainage device 16 causes the water sealing water to flow out at the innermost position of the borehole 12 for the following reason.
That is, when water for sealing is supplied into the borehole 12 near the right end of the packer hose 18 in the drawing, if there is a flow resistance portion in the middle of the borehole 12, the borehole 12 Even if the inside is not full, the water supplied into the borehole 12 is discharged to the outside of the borehole 12 through the water supply / drainage device 16 on the way.
Therefore, in order to prevent this, the inner pipe 48 of the water supply / drainage pipe 20 extends long in the right direction in the figure, and its tip is positioned near the tip of the boring hole 12, from which water for water sealing is bored. Water is supplied into the hole 12.

In the present embodiment as described above, since the water supply inner pipe 48 is not directly fixed to the packer hose 18, the packer hose 18 and the inner pipe 48 can be pushed into the boring hole 12 independently of each other. Is possible.
That is, when the packer hose 18 is pushed into the boring hole 12, it is possible to push the packer hose 18 alone without connecting the inner tube 48. Therefore, the work for pushing the packer hose 18 is easily performed with good workability. be able to.

  In the present embodiment, the inner tube 48 is configured by inserting the distal end side of the inner tube 48 into the fixed tube 50A of the outer tube 50 fixed to the packer hose 18, and using the fixed tube 50A as a guide tube. By connecting the short tubes 58 one after another and feeding them into the boring hole 12 while making them long, it is possible to configure the inner tube 48 of the entire required length, and boring the inner tube 48 at that time The insertion work into the hole 12 can also be facilitated.

Furthermore, in this embodiment, the outer pipe 50 is divided into a fixed pipe 50A located inside the packer hose 18 and fixed thereto, and an external extension pipe 50B on the drain outlet 68 side, and these are connected. Therefore, the extension tube 50B can be configured by connecting a large number of short tubes 60, and thus the extension tube 50B can be configured. Thus, in the narrow space with a small width in the tunnel 10 for water sealing, the packer hose 18 is gradually pushed deeply into the boring hole 12 while connecting the short tubes 60 one after another, and the final target depth is reached. In addition, the packer hose 18 can be positioned.
Therefore, even in the narrow water-sealing tunnel 10, it is possible to easily push the packer hose 18 into the boring hole 12.
Thereby, the installation work of the water supply / drainage device 16 can be easily and easily performed with good workability even in the narrow tunnel 10.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be configured in various forms without departing from the spirit of the present invention.

It is the figure which showed the water supply / drainage apparatus of one Embodiment of this invention in the installation state. It is the figure which expanded and showed the principal part of FIG. It is the figure which expanded and showed the principal part of the same embodiment. It is sectional drawing which expanded and showed the principal part different from FIG. 3 of the embodiment. It is explanatory drawing of the installation procedure of the water supply / drainage apparatus of the embodiment. It is explanatory drawing for the background description of this invention. It is a figure of a conventionally well-known water supply / drainage apparatus.

Explanation of symbols

12 Boring hole for water sealing 14 Opening 16 Water supply / drainage device 18 Packer hose 20 Water supply / drainage pipe 22 Rubber expansion pipe 24, 26 End member 38, 57, 61, 62, 66 Joint 48 Inner pipe 48B Extension part 50 Outer pipe 50A Fixed pipe 50B Extension pipe 52 Water supply channel 54 Drainage channel 58, 60 Pipe 63 Water supply port 64 Joint (water supply port member)
68 Drain port 70 Fitting (drain port member)
72 Intermediate joint

Claims (3)

(A) (a) a rubber expansion tube, (b) an end member attached to each end of the rubber expansion tube, and (c) provided through the end member, A fluid introduction hole for introducing a pressurized fluid into the interior, the rubber expansion tube is radially expanded by the introduction of the pressurized fluid, and the rubber is expanded on the inner surface of a water sealing borehole provided in the ground. A packer hose that closes the boring hole in a sealed state on the opening side by closely contacting the tube;
(B) An inner pipe for water supply and an outer pipe for drainage are provided so as to penetrate the packer hose in the longitudinal direction, and the inner pipe is provided on the opening side of the boring hole with respect to the packer hose. A water supply port is provided outside, and a drainage port is provided on the outer pipe on the same side as the water supply port, and the water sealing water supplied from the water supply port passes through the water supply channel inside the inner pipe to the boring. A double-pipe water supply / drainage pipe that takes out excess water in the borehole through a drainage channel between the inner pipe and the outer pipe and discharges the water from the drainage port, while supplying water into the hole;
In the water supply and drainage device for a water ring for water sealing,
The outer pipe is located in the packer hose and is divided into a fixed pipe fixed to the packer hose and an external extension pipe separated from the fixed pipe on the drain outlet side. And the extension pipe are connected to the outside of the packer hose, while the inner pipe is inserted into the fixed pipe in a non-fixed state with respect to the packer hose, and the extension portion on the water supply port side is outside the packer hose. A water supply / drainage device for a water sealing boring hole, wherein an end of the water supply port is connected and fixed to an end of the extension pipe through the extension pipe of the outer pipe.   The water supply / drainage device for a water sealing boring hole according to claim 1, wherein the extension pipe of the outer pipe is constituted by connecting a plurality of pipe bodies in the longitudinal direction by joints. 3. The water supply port member having the water supply port is connected and fixed to an end portion of the extension portion of the inner pipe, and the drainage pipe is connected to the extension pipe of the outer pipe. A drain outlet member with a mouth is connected and fixed,
A water supply and drainage device for a water sealing boring hole, wherein the water supply port member and the drainage port member are connected and fixed directly or through a joint forming a part of the extension pipe or the pipe body.

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