JP3131119B2 - How to stop water at a pipe propulsion wellhead - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water stopping method for stopping water at a pipe propulsion well when a plurality of pipes are buried in parallel in a ground from a shaft.

[0002]

2. Description of the Related Art Conventionally, when an underground structure is constructed underground, a plurality of underground structures at least corresponding to an upper floor cross section of the underground structure have been formed in order to prevent collapse of the ground around the underground structure to be constructed. A method of burying pipes in parallel is being implemented. In this method, the starting shaft and the reaching shaft are excavated at intervals of the length of the underground structure to be constructed, and the pipe is propelled and buried from the opening formed in the entrance wall of the starting shaft toward the reaching shaft. The propulsion of the pipe is performed by excavating the ground in front of the excavator while pushing the rear end of the pipe that follows the excavator sequentially by a propulsion device such as a hydraulic jack installed in one of the shafts.

[0003]

However, in the above-mentioned conventional method, the rear end of the last pipe in a pipe row buried in a penetrating state between the starting shaft and the reaching shaft is projected from the propulsion well into the starting shaft. Then, the next row of pipes is propelled and buried next to this row of pipes in series between both shafts, and this procedure is repeated to arrange the pipe rows side by side at the cross-sectional position of the underground structure to be constructed Since the rear end of the previously buried pipe row protrudes into the starting shaft, when propelling and burying a pipe from the next pipe burying propulsion port adjacent to the propulsion port, The projecting end of the pipe hinders the installation of a watertight packing around the wellhead.

[0004] Therefore, if groundwater is present in the ground where the pipe is buried, the groundwater infiltrates into the vertical shaft from the pit and it becomes difficult to bury the pipe. It can be adopted only in the underground part where the earth cover is relatively shallow, and there is a problem that its application range is limited. The present invention solves such problems, and makes it possible to smoothly and efficiently bury pipes in the ground where groundwater exists without infiltrating the groundwater into the vertical shaft. It is intended to provide a method.

[0005]

According to a first aspect of the present invention, there is provided a method for stopping water in a pipe propulsion wellhead, wherein pipes are sequentially cut from a wellhead formed in a wellhead wall of a vertical shaft. This is a method for stopping water at a wellhead when buried underground in parallel, and installing a watertight packing on the inner surface of the wellhead wall around the open end of the wellhead, and burying the propulsion while sliding a pipe against this watertight packing. And a step of placing the rear end opening of the rearmost pipe in the wellhead, and injecting a water-stopping material from the water-stopping packing to an outer peripheral portion of the pipe rear end on the front side. Removing the watertight packing and closing at least the submersible opening in the rear end opening of the pipe, and the next pipe on the inner surface of the wellhead wall around the opening end of the wellhead provided adjacent to the buried pipe Is characterized in that sequentially carried out and the step of mounting the proceeds burying waterproofing packing.

[0006] In the water stopping method according to the first aspect, the invention according to the second aspect is such that a short pipe is connected to a rear end of a pipe protruding rearward from a wellhead wall, and the short pipe is pushed to push the short pipe. After the rear end face has penetrated into the wellhead, water-stopping material is injected around the rear part of the pipe in front of the waterstop packing near the wellhead, and the short pipe is removed to close the pipe rear end opening. According to the invention described in claim 3, the rear end of the pipe protruding rearward from the wellhead wall is closed, the short pipe abuts on the closed face, and the short pipe is pushed forward until the closed face enters the wellhead. After that, a water-stopping material is injected around the rear part of the pipe in front of the water-stop packing near the wellhead, and then the short pipe is removed.

According to a fourth aspect of the present invention, there is provided a method for stopping water at a pipe propulsion wellhead, wherein pipes are sequentially buried in the ground in a parallel manner from a wellhead drilled in a wellhead wall of a vertical shaft. A method of stopping water, wherein a watertight packing is attached to the inner surface of the wellhead wall around the opening end of the wellhead, and a step of propelling and burying the pipe in sliding contact with the watertight packing, and a step near the wellhead of the last buried pipe. A step of injecting a water-stopping material into the outer peripheral portion of the front portion of the water-stopping packing, and removing the water-stopping packing and at least a portion of the rear end opening of the rearmost pipe facing the pipe propulsion wellhead to be buried next. Closing the part by positioning it in the wellhead;
A step of mounting the next waterproofing gasket for pipe propulsion burying on the inner surface of the wellhead wall around the open end of the wellhead provided adjacent to the buried pipe. In this water stopping method, as described in claim 5, after injecting a water stopping material around the rear part of the pipe in the front part of the water stopping packing near the wellhead, at least the rear end of the pipe protruding rearward from the wellhead wall. A part may be cut away and the cut end face may be located in the wellhead, and the cut end face may be closed.

[0008]

[Function] Since the watertight packing is attached to the wellhead, there is no danger of groundwater infiltrating into the shaft from the wellhead when propelled and buried through the wellhead while sequentially adding pipes. In addition, before moving to the work of propelling and burying the next pipe adjacent to the propelled buried pipe row, water-stopping material is injected into the ground around the rear end of the last pipe of the previously buried pipe row. Even if the waterproof packing is removed, it is possible to prevent groundwater from entering the shaft from around the pipe. In addition, since the rear end opening of the pipe is entirely located or the rear end side of the pipe facing the propulsion well side of the next pipe is located in a state of being immersed in the wellhead, the next propulsion wellhead Since the waterproof packing can be easily attached to the surrounding area and the rear end opening of the buried pipe in the wellhead is closed, there is a possibility that groundwater may enter the buried pipe when the pipe is propelled from the next propulsion wellhead. Nor.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 1 shows a state in which a rectangular steel pipe 1 having a rectangular cross section is protruded and buried from a starting shaft A to an reaching shaft B, and FIGS. 3 shows an embodiment of the method. First, a water stoppage treatment is performed by injecting a chemical solution into a ground around the concrete wellhead wall 2 of the starting shaft A through an injection pipe (not shown) driven from the ground or the like, and then, as shown in FIG. Is crushed and removed, and a rectangular propulsion wellhead 3 of the pipe 1 is bored. When the pipe is a round pipe, the wellhead 3 may be formed as a circular wellhead.

Next, as shown in FIG. 3, a watertight packing 4 is disposed on the inner surface of the wellhead wall 2 around the open end of the propulsion wellhead 3 inside the shaft A. The watertight packing 4 is mounted on the inner surface of the opening front end of a rectangular tubular mounting frame 5 slightly larger than the opening cross section of the wellhead 3, and a flange portion 5 a provided around the opening front edge of the mounting frame 5. Is fixed to the inner wall surface of the wellhead wall 2 around the open end of the wellhead 3 by bolts 6 and the watertight packing 4
Is protruded into the wellhead 3. After the watertight packing 4 is attached, the excavator 7 is started from the wellhead 3 toward the arrival shaft B through the inside of the attachment frame 5, and the pipe 1 having a fixed length is connected to the excavator 7. As shown in FIG. 1, the excavator 7 is pushed forward by a propulsion jack 8 installed in the starting shaft A, and its four outer peripheral surfaces are slid in contact with the waterproof packing 4 to prevent groundwater from entering the starting shaft A while excavating the excavator 7.
Buried according to the excavation.

After burying one pipe 1, the front end of the next pipe 1 is integrally and watertightly connected to the rear end of the pipe 1 by welding or the like, and the excavator 7 excavates the front ground again. The rear end of the pipe 1 is pushed forward by the propulsion jack 8 in the same manner as described above, and the pipe 1 is propelled and buried. In this way, as shown in FIG. 1, the pipes 1 are successively added in series and buried by propulsion, so that the foremost pipe 1 reaches the reaching shaft B and, as shown in FIG. The opening 1a is made to enter the wellhead 3 until it is immersed,
The rear end opening end surface is located at a position substantially flush with the inner surface of the wellhead wall 2. In this state, an appropriate short pipe is connected to the rear end of the last pipe 1 and the rear end of the short pipe is pushed by the propulsion jack 8 so that the pipe 1 protruding into the starting shaft A is formed. By pushing the protruding rear end portion into the wellhead 3.

In this state, the rearmost pipe 1
The waterproof packing 4 is in close contact with the outer peripheral surface of the rear end opening,
The rear part of the rearmost pipe 1 through a water-stop material injection hose 16 previously connected and connected to an injection hole (not shown) drilled at the opening end of the mounting frame 5 to which the water-stop packing 4 is mounted. After the water-stopping material 9 is injected and solidified between the outer peripheral surface, the inner peripheral surface of the wellhead 3 and the excavation wall 17 by the excavator 7, the water-proof packing 4 is removed together with the mounting frame 5. Thereafter, as shown in FIG. 5, a closing plate 10 is water-tightly fixed to the rear end opening of the pipe 1 by welding or the like to close the opening end. The closing plate 10 may be attached to the rear end opening of the rearmost pipe 1 in advance, and the pipe 1 may be buried until the closing plate 10 reaches the inner end of the opening of the wellhead 3.

Then, the wellhead wall portion 2 adjacent to one side of the propulsion wellhead 3 of the buried pipe 1 is crushed and removed, and the next pipe which communicates with the side of the propulsion wellhead 3 as shown in FIG. After the buried wellhead 3 'is opened, the watertight packing 4 is arranged at the inner end of the opening of the wellhead 3'. This water-stop packing 4 is arranged by attaching bolts 6 to the front end flange 5a of one side frame of the mounting frame 5 to which the water-stop packing 4 is mounted, on the surface of the buried pipe 1 on the opposite side of the closing plate 10. This is performed by fixing the upper and lower frame portions and the other side frame portion of the mounting frame 5 to the inner surface of the wellhead wall 2 around the open end of the propulsion wellhead 3 ′ with bolts 6. When the wellhead wall 2 can be crushed and cut by the excavator 7, the mounting frame 5 on which the watertight packing 4 is mounted is fixed to the propulsion buried portion of the next pipe, and then the excavator is mounted through the mounting frame 5. The propulsion wellhead 3 'can be formed by advancing 7.

After that, the excavator 7 is pierced from the propulsion well 3 'in the same manner as the operation of burying the pipes 1 buried in series.
At the same time, the pipe 1 following the excavator 7 is pushed forward by the propulsion jack 8, and after the pipe 1 is buried, the next pipe 1 is sequentially welded and the like, and the foremost pipe 1 is arriving vertically. B and the rear end of the last pipe 1 is sunk into the propulsion well 3 'until the opening rear end face is substantially flush with the inner surface of the wellhead wall 2. When the pipe 1 is buried under propulsion, groundwater tries to enter the starting shaft A through the gap between the pipe 1 being propelled and the excavation wall surface. Since the intrusion is prevented and the rear end opening of the previously buried pipe 1 is closed by the closing plate 10, groundwater does not enter the pipe 1 either.

After the pipes 1 are buried in series from the propulsion well 3 'to the reaching shaft B, the propulsion well 3'
Inject water-stopping material 9 in the same manner as described above into the gap between the rear part of the pipe and the excavation wall at the front side of water-stop packing 4 that is in close contact with the outer peripheral surface of the rear end of pipe 1 located inside
After solidifying and closing the rear end opening of the pipe 1 with a closing plate 10, the wellhead wall part adjacent to one side of the wellhead 3 'is crushed and removed to open a further pipe wellhead. In the same manner as above, the mounting frame 5 to which the water-stop packing 4 is attached is fixed around the open end of the wellhead, and the next pipe 1 is buried through the wellhead. The step of injecting the water-stopping material can be omitted when the lubricating material used when propelling the pipe 1 has a water-stopping effect.

Hereinafter, the formation of the above-mentioned propulsion well 3 ', the installation of the watertight packing 4 around the open end of the propulsion well 3', and the rear end of the last pipe 1 to be buried through this propulsion well 3 ' As shown in FIG. 7, the steps of positioning the opening inside the propulsion wellhead 3 ′, closing the rear end of the opening of the pipe 1, and injecting the water-stopping material are repeated, and as shown in FIG. After the pipe rows are buried side by side at the cross-sectional position, an underground structure C is brought into contact with the rear end face of the pipe rows and is propelled from the starting shaft A toward the reaching shaft B, thereby forming a pipe line and an underground structure. The underground structure C is constructed between the shafts A and B by replacing C.

FIGS. 8 to 12 show an embodiment of a method for stopping water at a pipe propulsion wellhead according to claim 4 of the present invention. A portion of the pipe 1 is crushed and removed to form a rectangular propulsion wellhead 3 of the pipe 1, and an open end flange 5a of the rectangular tubular mounting frame 5 is bolted to the inner surface of the wellhead wall 2 around the open end of the propulsion wellhead 3. The watertight packing 4 fixed to the mounting frame 5 and mounted on the inner surface of the front end of the opening of the mounting frame 5 is projected into the wellhead 3, and is brought into sliding contact with the watertight packing 4 while following the excavator 7. The pipes 1 are successively replenished by welding or the like in a watertight manner, and the operation steps of burying the pipes 1 in the propulsion jacks 8 installed in the starting shafts A through the propulsion wells 3 are the same as those described above (see FIGS. ).

In this method, the foremost pipe 1 reaches the reaching shaft B and the rear end of the last pipe 1
As shown in the figure, when it comes into the state of protruding into the starting shaft A, the protruding rear end 1a is not immersed in the wellhead 3,
In the same manner as described above, a water-stopping material 9 is injected into the front side of the water-stop packing 4 that is in close contact with the protruding rear end 1a by using an injection hose. Is filled with the water-stopping material 9 and solidified, and then the mounting frame 5 on which the water-stopping packing 4 is mounted is removed. Thereafter, the protruding rear end 1a of the pipe 1 is cut off and removed.
Is located in the wellhead 3. In addition, with the watertight packing 4 attached, the pipe 1
The projecting rear end 1a may be cut off, and after the cut-off, the mounting frame 5 to which the waterproof packing 4 is attached may be removed.

Next, as shown in FIG. 11, a closing plate 10 is fixed to the rear end opening of the pipe 1 immersed in the wellhead 3 by welding or the like, and the opening is closed tightly. A wellhead plate 11 is fixed to the wellhead wall 2 at the inner end of the opening 3 by bolts, and the wellhead plate 11 closes the portion other than the other side of the wellhead 3. That is, one side edge and the upper and lower edges of the wellhead cover plate 11 are fixed to the inner surface of the wellhead wall around the wellhead 3 and the other end is separated from the other side edge of the wellhead 3 with a small space therebetween. Next, the wellhead cover plate 11 is attached so as not to contact the pipe 1 to be buried adjacently.

Thereafter, as shown in FIG.
The wellhead wall portion 2 adjacent to one side of the above-described wellhead 3 equipped with 11 is crushed and removed, and the next pipe-buried thrustwell 3 ′ communicating with the side of the wellhead 3 is opened. A waterproof packing 4 is provided around the open end of the wellhead 3 '. As shown in FIGS. 12 and 13, the installation work of the watertight packing 4 is performed by attaching the front end flange portion 5a of one side frame of the mounting frame 5 to which the watertight packing 4 is mounted, as shown in FIGS. It is fixed by watertight to the side edges by bolts 6 and by fixing the upper and lower frames and the other side frame of the mounting frame 5 to the inner surface of the wellhead wall 2 around the open end of the propulsion wellhead 3 ′ by bolts 6. Will be

The excavator 7 is started from the propulsion well 3 'in the same manner as the operation of burying the pipes 1 buried in series, and the pipe 1 following the excavator 7 is propelled by a propulsion jack 8'.
After the pipes 1 are buried and buried, the next pipes 1 are sequentially welded and the like, and the first pipe 1 reaches the reaching shaft B while being watertightly added, and the rear end of the last pipe 1 is propelled. The same process as described above is performed in a state where the shaft is projected from the wellhead 3 'into the start shaft A.

That is, the water-stopping material 9 is injected into the front side of the water-stop packing 4 which is in close contact with the protruding rear end 1a by an injection hose, and the outer peripheral surface of the pipe 1, the inner peripheral surface of the wellhead 3 and the excavation wall surface are formed. After filling and solidifying the water-stopping material 9 in the gap between them, the mounting frame 5 on which the water-stopping packing 4 is mounted is removed, and the protruding rear end 1a of the pipe 1 is cut off. A closing plate 10 is fixed to the rear end opening of the inner pipe 1 by welding or the like to tightly close the opening, and then a wellhead cover plate 11 is fixed to the wellhead wall 2 at the inner end of the wellhead 3 'by bolts. , This wellhead
Crush and remove the wellhead wall part adjacent to one side of 3 'to open the next pipe propulsion wellhead, and fix the mounting frame 5 with the watertight packing 4 around the open end of this wellhead in the same manner as above. Then, the following burial work of the pipe 1 is performed through the wellhead.
As shown in (1), pipe rows are buried side by side at the cross-sectional position of the underground structure. The reason why the closing plate 10 is fixed to the rear end opening of the pipe 1 is that when the next pipe is buried next to the pipe, the water blocking material 9 flows into the previously buried pipe when the water blocking material is filled. This is to prevent you from doing so. That is, if the cutout position of the protruding rear end portion 1a is flush with the wellhead wall 2, the closing plate 10 and the wellhead cover plate 11 can be shared.

FIGS. 14 and 16 show another embodiment of the method for stopping water at a pipe propulsion wellhead according to the fourth aspect of the present invention. The pipe 1 is connected in series between both shafts A and B and propelled. The process of injecting the water-stopping material 9 from the water-stop packing 4 around the rear part of the pipe 1 on the front side in a state where the rear end of the last pipe 1 is buried and protruded into the starting shaft A is the same. However, the attachment means of the watertight packing 4 to the next propulsion well 3 'is different. That is, as shown in FIG.
Next, only one side of the protruding end of the buried pipe 1 facing the side of the propulsion well 3 'to be formed is cut so that the cut end face 12 is located within the well 3 and the cut end piece 12 is attached to the cut end face 12. 10a
Is fixed in a watertight manner by welding or the like.
The front end flange portion 5a of one side frame portion of the watertight packing mounting frame 5 to be mounted on the next propulsion well 3 'is watertightly fixed by bolts 6 as shown in FIG. Of the wellhead and the other side frame at the inner end of the opening of the propulsion wellhead 3 '
Are fixed by bolts 6 to the inner surface of the. In addition,
The closing plate 10a of the present embodiment is the closing plate of the above-described embodiment.
This corresponds to the case where the wellhead 10 and the wellhead plate 11 are also used. Other steps are the same. Note that the resection end face 12 is closed
This may be performed by directly contacting and fixing the front end flange portion 5a of the one side frame portion of the mounting frame 5 without using 10a.

FIGS. 17 to 19 show still another embodiment of the method for stopping water from a pipe propulsion wellhead according to the present invention.
The process of propelling and embedding pipes 1 in series between both shafts A and B is the same, except that the protruding end 1a is immersed in the wellhead 3 without being cut off. is there.

That is, after the pipe 1 is buried between both shafts A and B, the short pipe is pushed into the rear end face of the protruding end of the last pipe 1 protruding into the starting shaft A as shown in FIG. 14
The short pipe 14 is pushed forward by a propulsion jack or the like to bring the rear end face of the pipe 1 into the wellhead 3. The attachment of the closing plate 10 for closing the rear end opening of the pipe 1 may be before or after the pushing by the short pipe 14. After the rear end face of the pipe 1 is pushed into the wellhead 3 in this way, the water-stopping material 9 is injected from the water-stop packing 4 to the periphery of the rear part of the outer pipe 1 on the front side. As described in the above method, the wellhead cover plate 11 is fixed to the wellhead wall 2 around the open end of the wellhead 3 with bolts (FIG. 18), and is adjacent to one side of the wellhead 3 on which the wellhead plate 11 is mounted. The wellhead wall portion 2 is crushed and removed, and a next pipe burying wellhead 3 'communicating with the side of the wellhead 3 is opened.
A mounting frame 5 having a waterproof packing 4 around the opening end of the mounting frame 5 is fixed in the same manner as described above.

In all the above methods, the case where the pit wall 2 of the shaft A is formed of a crushable concrete wall has been described. However, when the shaft A is formed of steel sheet pile, the portion where the pit is to be opened is provided. A similar water stopping method can be adopted by forming a wellhead wall made of poor mortar. In this case, the wellhead wall is formed by cutting off the lower part of the steel sheet pile after stopping the water around the wellhead wall 2 'and then pouring poor mortar on the inner surface of the steel sheet pile as shown in FIG. After forming the wellhead wall 2 ', the steel sheet pile 15 is pulled upward from the cut portion and removed to expose the wellhead wall 2' to the ground side as shown in the figure, and thereafter, as shown in FIG. A mounting frame 5 having a watertight packing 4 can be attached to the wellhead wall 2 'around the propulsion wellhead 31. When the excavator 7 is started through the inside of the mounting frame 5, the wellhead wall 2 'is made of poor mortar. Therefore, the propulsion wellhead 31 can be drilled while the poor mortar is crushed by the excavator 7.

FIG. 21 shows a method of forming a wellhead wall of a propulsion wellhead 32 without using poor mortar. A partition plate 16 is fixed in a rectangular frame shape at a propulsion wellhead formation site on the inner surface of a steel sheet pile 15. The mounting strip 17 of the mounting frame 5 having the packing 4 is fixed to the upper and lower ends of the partition plate 16 and fixed to the strip 17 as shown in FIG.
The mounting frame 5 having the packing 4 is mounted as shown in FIG.
32.

[0028]

As described above, according to the method for stopping water at a pipe propulsion wellhead according to the present invention, pipes are sequentially buried in the ground while being connected in series from a wellhead formed in a wellhead wall of a vertical shaft. The watertight packing is attached around the open end of the wellhead, so that the watertight packing comes into close contact with the outer peripheral surface of the pipe propelled and buried underground from the wellhead to prevent groundwater from entering the shaft. Before moving on to the next buried pipe row adjacent to the buried pipe row, the area around the rear end of the last pipe in the previously buried pipe row. Since the waterproof material is injected into the ground, it is possible to prevent groundwater from entering the shaft from around the pipe even if the waterproof packing is removed.

Furthermore, since the rear end opening of the pipe is located entirely or the rear end side of the pipe facing the propulsion well side of the next pipe is immersed in the well, the following Waterproof packing can be easily installed around the wellhead, and the rear end opening of the buried pipe in the wellhead is closed, so that when propelling the pipe from the next wellhead, groundwater infiltrates the buried pipe. Therefore, the work of propelling and burying the underground structure construction pipes in a parallel state can be performed efficiently even in the ground where the groundwater exists.

[Brief description of the drawings]

FIG. 1 is a simplified vertical sectional side view showing a state in which a pipe is being buried under propulsion;

FIG. 2 is a cross-sectional view of a state where a wellhead is provided on a wellhead wall;

FIG. 3 is a cross-sectional view showing a state in which a pipe is made to follow an excavator and is propelled underground.

FIG. 4 is a cross-sectional view of a state in which the rear end of the last pipe is located in the wellhead;

FIG. 5 is a cross-sectional view of the rear end of the pipe with a closing plate attached thereto,

FIG. 6 is a cross-sectional view of a state where the excavator is started from the next wellhead.

FIG. 7 is a simplified vertical sectional front view of a state in which a parallel pipe is buried in the ground,

FIG. 8 is a cross-sectional view with a wellhead provided for explaining another embodiment of the method of the present invention.

FIG. 9 is a cross-sectional view showing a starting state of an excavator having a pipe following it.

FIG. 10 is a cross-sectional view of a state where the rear end of the last pipe is projected into the shaft.

FIG. 11 is a cross-sectional view of a state in which a wellhead plate is mounted.

FIG. 12 is a cross-sectional view of a state where the excavator is started from the next wellhead,

FIG. 13 is an enlarged front view of a wellhead part.

FIG. 14 is a cross-sectional view of a state in which the rear end of the pipe is slightly projected into the shaft;

FIG. 15 is a cross-sectional view showing a modification of the packing attaching means from FIG. 14,

FIG. 16 is a cross-sectional view showing a state where packing is mounted.

FIG. 17 is a cross-sectional view showing a modified example of the packing attaching step.

FIG. 18 is a cross-sectional view of a state in which a wellhead plate is mounted.

FIG. 19 is a cross-sectional view of a state where packing is mounted.

FIG. 20 is a cross-sectional view showing a modified example of a wellhead wall;

FIG. 21 is a cross-sectional view of a state where the excavator is started from the wellhead.

FIG. 22 is a cross-sectional view showing still another modified example of the wellhead wall;

FIG. 23 is a transverse sectional view of a state in which the excavator is started from the wellhead.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe 2 Wellhead wall 3 and 3 'Wellhead 4 Waterproof packing 5 Mounting frame 9 Waterproof material 10 Closing plate

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hidekazu Tanaka 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi Okumura Gumi Co., Ltd. (58) Field surveyed (Int.Cl. ⁷ , DB name) E21D 9/06 311 E21D 9/06 301

Claims (5)

(57) [Claims] 1. A method for stopping water from a wellhead when pipes are sequentially buried and buried in the ground from a wellhead in a wellhead wall of a vertical shaft, the method comprising: A process of attaching a waterproof packing and burying the pipe while sliding the pipe against the waterproof packing, a step of placing the rear end opening of the last pipe in the wellhead, and a step forward from the waterproof packing. Injecting a waterproof material into the outer peripheral portion of the rear end of the pipe on the side, removing the waterproof packing, and closing at least the submersible opening in the rear end opening of the pipe; Mounting a next watertight packing for pipe propulsion burying on the inner surface of the wellhead wall around the open end of the adjacent wellhead. 2. A short pipe is connected to a rear end of a pipe protruding rearward from a wellhead wall, and the short pipe is pushed forward to cause the rear end face of the pipe to enter the wellhead. 2. A method for stopping water at a pipe propulsion wellhead according to claim 1, wherein a water-stopping material is injected around the rear part of the pipe, and the short pipe is removed to close the opening at the rear end of the pipe. 3. A rear end of a pipe protruding rearward from a wellhead wall is closed, a short pipe is brought into contact with the closed face, and the short pipe is pushed forward until the closed face is immersed in the wellhead. 2. The method for stopping water at a pipe propulsion wellhead according to claim 1, wherein a water-stopping material is injected around the rear part of the pipe at the front part of the water packing, and then the short pipe is removed. 4. A method for stopping water in a wellhead when pipes are sequentially buried in the ground in a parallel manner from a wellhead formed in a wellhead wall of a vertical shaft, wherein the inner surface of the wellhead wall around an open end of the wellhead is provided. A step of attaching a waterproof seal and propelling and burying the pipe in sliding contact with the waterproof seal, and a step of injecting a waterproof material into an outer peripheral portion of a front part of the waterproof seal near a pit of the last buried pipe. Removing the watertight packing and positioning at least a portion of the rear end opening of the rearmost pipe facing the pipe propulsion wellhead side to be buried next in the wellhead, and closing the portion; and Mounting a next watertight packing for pipe propulsion burying on the inner surface of the wellhead wall around the open end of the adjacent wellhead. 5. After injecting a water-stopping material around the rear part of the pipe at the front part of the water-stop packing near the wellhead, at least a part of the rear end of the pipe protruding rearward from the wellhead wall is cut and the cut end face is cut. The method for stopping water in a pipe-propelled wellhead according to claim 4, wherein the cut end face is closed in the wellhead.