JPH1150781A - Pit mouth cut-off working method and cut-off packing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely accomplish cut-off work for a pit mouth in pipe roof construction of the groundwater level in a simple structure by compression- deforming an elastic body by a fastening member, and bringing a cut-off packing into contact with the outer peripheral part of a penetration member to cut off water. SOLUTION: A pressure plate 27 is fitted to the surface of a cut-off rubber 26. A cut-off packing 28 has a four-split structure comprising first packing parts 28a, 28a and second packing parts 28b, 28b having a part along the circular-arc part of a pipe 1. The cut-off packing 28 is constructed so that a stud bolt 29 planted in the front plate of a form 23 is passed through a cut-off rubber (elastic body) 26 and a pressure plate 27 and fastened from the front side by a nut (fastening member) 30, whereby the cut-off rubber 26 is compressiondeformed in the radial direction of the pipe 1 to exhibit a water cut-off effect. Accordingly, the elastic body 26 is always pressed to the outer peripheral surface of the penetration member to cut off water, and water cut-off for a pit mouth of the groundwater level can be surely performed safely in a simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wellhead stoppage method and a waterstop packing particularly suitable for use in a pipe roof method.

[0002]

2. Description of the Related Art Conventionally, a so-called pipe roof method has been known as an auxiliary method for excavating a tunnel on a ground where a river or a ground structure or the like is located above, or for excavating a tunnel having a large cross section. This pipe roof method is
A large number of small diameter pipes are connected to each other so that their outer peripheral portions are adjacent to each other, and are disposed in the ground so as to cover at least above a tunnel to be excavated, and these pipes are used as underground walls or reinforcing bodies. It is a construction method.

[0003] Since the above-mentioned pipe roof construction method is generally used for a stagnant gravel layer, it is required to reliably stop water at the starting port in construction. As a method for stopping water at the starting well, there is a conventional method, for example,
As disclosed in Japanese Patent No. 91894, as an example used for a shield excavator, there is known an example in which a water stop device formed by laminating a waterproof rubber on a protective plate is brought into contact with the excavator. .

[0004] As a conventional example of a water shutoff method in a pipe roof method, there is Japanese Patent Application No. 8-325540 proposed by the present applicant. In this prior invention,
In order to prevent groundwater from flowing out from the periphery of the joint piece that connects adjacent pipes, the joint piece of the adjacent pipe has a special shape, and a dummy packing part that has almost the same shape as this joint piece The water stop at the wellhead is performed by using the water stop packing provided.

[0005]

However, the water stopping method disclosed in the former publication (Japanese Utility Model Application Laid-Open No. 57-91894) requires that the outer shape of the penetrating member penetrating into the ground be circular. This is not applicable when the penetrating member has a joint piece of a special shape on the outer peripheral surface, such as a pipe used in a pipe roof construction method. Further, in this water stopping method, since the free end of the water stopping rubber is bent to rub against the outer peripheral surface of the penetrating member to stop the water, the water stopping rubber is easily damaged,
There are difficulties in durability.

On the other hand, the prior invention (Japanese Patent Application No. 8-325540) proposed by the present applicant uses a dummy packing having substantially the same shape as the joint piece as a water-stop packing. In particular, a certain degree of effect can be expected as a water stoppage technique around a pipe joint piece in the pipe roof construction method. However, in the prior invention, there is a problem that the outer shape of the joint piece is limited to a required shape, and it is difficult to apply to a pipe having a joint piece having a complicated shape.

[0007] The present invention has been made in view of such a problem, and even if the joint piece has a complicated shape, the wellhead can be reliably stopped in the construction of the pipe roof under the groundwater level with a simple structure. Provide a wellhead stoppage method that can
It is another object of the present invention to provide a waterproof packing used in the waterproofing method.

[0008]

Means for Solving the Problems and Functions / Effects In order to achieve the above-mentioned object, a wellhead stoppage method according to the present invention comprises:
A wellhead stoppage method for stopping water at the starting wellhead at an outer peripheral portion of a penetrating member penetrating into the ground, wherein a watertight packing formed by compressively deforming an elastic body by a fastening member is provided on the outer peripheral portion of the penetrating member. It is characterized by contacting and stopping water.

In the present invention, a water-stop packing made by compressing and deforming an elastic body by a tightening member is used, and the water-stop is performed by bringing the water-stop packing into contact with the outer peripheral portion of the penetrating member. Therefore, the elastic body can always be pressed against the outer peripheral surface of the penetrating member to stop the water, and the wellhead can be reliably and safely stopped below the groundwater level with a simple structure. That is, by adjusting the tightening force of the tightening member in accordance with the water pressure at which water is to be stopped, the contact force between the water-stop packing and the penetrating member can be adjusted, so that water can be stopped with an optimum contact force. Also, even if the contact part of the watertight packing that comes into contact with the penetrating member wears and the waterstop becomes worse, there is no need to interrupt the construction and replace the watertight packing, and tighten the fastening members while continuing the construction. It is only necessary to increase the force to increase the contact force with the penetrating member to recover the water stoppage, so that not only the work is simple, but also the construction efficiency is good. Furthermore, even if the accuracy of the water-stop packing shape is poor, the water-stop packing can be sufficiently exhibited.

In the present invention, the penetrating member is a pipe for a pipe roof having a joint piece on an outer peripheral surface,
The water-proof packing is provided at least around a joint piece of the pipe for the pipe roof, and has a first packing portion having a shape along the joint piece, and is provided so as to be adjacent to the first packing portion. And a second packing portion having a portion along the arc portion of the pipe for use. As described above, the wellhead stoppage method according to the present invention is a wellhead stoppage method that is particularly applicable to the penetration of a pipe into the ground in the pipe roof method.
That is, even if the joint piece attached to the outer peripheral surface of the pipe has a complicated shape like a pipe for a pipe roof, the wellhead can be easily and reliably stopped. Therefore, it is possible to easily prevent the sediment loss and collapse of the pipeline at the time of such penetration of the pipe. Further, the present invention has an effect that the mounting direction of the water-stop packing can be changed according to the rolling of the pipe.

[0011] More specifically, the wellhead stoppage method according to the present invention is used when a pipe for a pipe roof having a joint piece on the outer peripheral surface and having a partially lacking joint piece penetrates the ground. A method for stopping water at an outer periphery of a pipe roof pipe at a starting wellhead portion, wherein (a) a pipe is formed so as to have a shape along the joint piece, and an elastic body is fastened to a fastening member. And (b) penetrating the pipe for a pipe roof until the missing portion of the joint piece is positioned at the wellhead, and then the watertight packing is performed. (C) when another pipe roof pipe adjacent to the penetrated pipe roof pipe is penetrated into the ground, solidification relating to the penetrated pipe roof pipe Wherein removing the minute part (a)
It is characterized in that each step of (b) is repeatedly performed.

In the present invention, in addition to the operation and effect of the above-mentioned invention, the inside of the water-stop packing is solidified to stop the water, and the solidified portion of the pipe for the pipe roof that has been penetrated is used for another adjacent pipe roof. Since the pipe is partially removed by penetrating into the ground, the gap at the joint between the pipes for pipe roof can be reduced, and water leakage from the joint can be minimized.

Further, the watertight packing of the present invention used in this wellhead watertight construction method is a watertight packing having a shape along the outer peripheral surface of a penetrating member penetrating into the ground, comprising two plates, An elastic body interposed between the plates, and a tightening member for compressing and deforming the elastic body by pressing the elastic body through the two plates are provided.

In the present invention, since the water-stop packing can be compressed and deformed almost uniformly through the two plates, the water-stop from the penetrating member is also improved.
In addition, not only the plate plate but also a block shape or the like may be used as long as the water stop packing can be compressed and deformed almost uniformly.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of a wellhead watertight method and a watertight packing according to the present invention will be described with reference to the drawings.

FIG. 1 shows a side view (a) and a front view (b) of a pipe for a pipe roof according to one embodiment of the present invention.

The pipe for the pipe roof of this embodiment (hereinafter referred to as the pipe)
Simply called a pipe. 1) has a shape in which two joint pieces 3 and 4 slightly shorter than the pipe main body 2 are welded in the longitudinal direction along the outer peripheral surface of the cylindrical pipe main body 2. Here, one joint piece 3 is a female joint piece formed by combining two L-shaped steels with the bent portions facing inward, and the other joint piece 4 is a female joint piece.
It is a male joint piece obtained by combining L-shaped steel pieces with their bent portions facing outward. Thus, the adjacent pipes 1 and 1 are connected by connecting the female joint piece 3 and the male joint piece 4.

In order to bury such a pipe 1 with the joint pieces 3 and 4 in the soil, first, as shown in FIG. 2, a front pipe (a tunnel excavator) having a cutter head 10a at the tip end. A shaft 11 for starting the shaft 10 is formed, and in soil containing much water, an SMW composed of H-shaped steel and concrete is provided on the ground around the shaft 11.
(Soil Mixing Wall) or a retaining wall 9 such as a continuous wall is constructed. Next, a hole for starting the leading pipe 10 is formed in the side wall of the shaft 11, and the leading pipe 10 is advanced from the hole along the starting stand 14 by the main pushing device 13 installed in the shaft 11. The ground 12 is penetrated. Thereafter, the pipe 1 is fixed to the rear end of the front pipe 10, and the rear end face of the pipe 1 is pressed by the main pressing device 13, so that the pipe 1 is placed in the ground 12 following the front pipe 10. Let it penetrate. When the pipe 1 penetrates, the periphery of the penetrating hole (pit) formed in the side wall of the shaft 11 is stopped by a water stop device (described in detail later) 15.

In the present embodiment, as shown in FIG. 3, the pipe to be first embedded, the reference pipe P ₁ in other words, in order to equalize the left and right of the resistor, the female joint piece on both sides The pipes P ₂ , P ₃ , and P ₄ other than the reference pipe P ₁ have a female joint piece 3 and a male joint piece 4.

Next, a method for stopping water at a wellhead when embedding the pipe 1 with the joint pieces 3 and 4 and the water stop device 1
The structure of No. 5 will be sequentially described according to the steps with reference to FIGS. 4A to 14, (a) is a cross-sectional view, and (b) is a front view.

(1) Step 1 (refer to FIG. 4) A base plate 20 having a shape in which a pipe penetration portion is cut is attached to the side wall of the shaft 11. The base plate 20 is provided corresponding to the pipe to be penetrated, and is fixed between the adjacent base plates 20 so as not to leak water.

(2) Step 2 (see FIG. 5) The primary waterproof rubber 21 is attached to the surface of the base plate 20 corresponding to the pipe (reference pipe) P ₁ to be buried first. In this case, the primary waterproof rubber 21 has a shape in which a substantially rectangular ear portion is continuously provided at a portion corresponding to the joint piece 3 of the pipe 1 with respect to a circular hole slightly larger than the pipe 1. I have.

(3) Step 3 (see FIG. 6) On the surface of the primary waterproof rubber 21 attached in Step 2,
A holding plate 22 having the same shape as the primary waterproof rubber 21 is attached.

[0024] (4) Step 4 The mold 23 so as to surround the base plate 20,1 Tsugitomesui rubber 21 and the pressing plate 22 corresponding to (see FIG. 7) the reference pipe P ₁ is fixed by welding. Here, the form 23
Are two portions corresponding to the female joint piece 3, 3 of the reference pipe P ₁ to be penetrated it is formed in the same shape as those female joint piece 3, 3.

(5) Step 5 (see FIG. 8) The inner wall and the outer wall of the retaining wall 9 are blown out to test the ground, and thereafter, the form 23 is entirely covered with the form 23.
, A rectangular temporary plate 24 is attached.

(6) Step 6 (see FIG. 9) When the ground collapses due to the ground excavation, the form 23
The mortar 25 is filled into the inside and the holes formed by the trial excavation.

(7) Steps 7 and 8 (see FIGS. 10 and 11) The temporary plate 24 is removed, and the secondary waterproof rubber 26 is attached to the removed position. Then, a holding plate 27 is attached to the surface of the secondary waterproof rubber 26. The secondary waterproof rubber 26 and the holding plate 27 constitute a part of the waterproof packing 28 of the present embodiment. FIG. 15 (a)
As shown in (b), this waterproof packing 28
Are provided at the periphery of the joint piece 3 of the pipe 1 to be penetrated, and are formed along the joint piece 3 with the first packing portions 28a, 28a, and the first packing portions 28a, 28a.
The pipe 1 has a four-part structure including second packing parts 28b and 28b provided adjacent to the pipe 28a and having a portion along the arc part of the pipe 1. In addition, this water-stop packing 28 is formed by inserting a water-stop rubber (elastic body) 26 and a holding plate 27 into a stud bolt 29 planted on a front plate of the mold frame 23, and a nut (a tightening member) from the front side. 30
The watertight rubber 26 is compressed and deformed in the radial direction of the pipe 1 to exert a waterstop effect.

(8) Step 9 (see FIG. 12) The pipe 1 is propelled. If there is a lot of water at the time of this propulsion, a wellhead shutoff material 31 such as muddy water or polyground (FIG. 1)
5) is injected into the mold 23. At the time of this propulsion, the gap between the waterproof rubber 26, the pipe 1 and the joint piece 3 is completely sealed by the compressed waterproof rubber 26 by tightening the nut 30 of the waterproof packing 28. . Thus, even in the case of high pressure water, collapse of the wellhead can be reliably prevented, and safe construction can be performed.

(9) Step 10 (see FIG. 13) After the pipe 1 is propelled, the mortar 25 is injected into the mold 23 again, and thereafter, the mold 23 and the waterproof packing 28 attached to the surface thereof are removed. . This penetration of the reference pipe P ₁ is completed. Next, this reference pipe P ₁
In preparation for the penetration of the pipe P ₃ adjacent to the pipe P ₃ , the mortar on the pipe P ₃ side is removed, and the primary waterproof rubber is attached to the surface of the base plate 20 corresponding to the pipe P ₃ in the same manner as in Step 2 (FIG. 5). 21 is attached. In the state where the reference pipe P ₁ is inserted, the joint pieces 3 and 3 of the pipe 1 are exposed on the surface of the mortar 25 because the joint pieces 3 and 3 are missing. Never.

(10) Step 11 (see FIG. 14) As shown in FIG. 16, the secondary water stopping rubber 3 is formed by the same steps as Steps 3 (FIG. 6) to Step 8 (FIG. 11).
2. Attach a waterproof packing 34 composed of a holding plate 33 and the like. The waterproof packing 34 is provided around the female joint piece 3 of the pipe 1 to be penetrated, and has a first packing portion 34 a shaped along the joint piece 3.
A second packing portion 34 provided adjacent to the first packing portion 34a and having a portion along the arc portion of the pipe 1 and a portion along the male joint piece 4 of the pipe 1.
b, 34b. In addition,
The structure of the waterproof packing 34 to be compressed and deformed by tightening the waterproof rubber 32 with a nut is the same as the waterproof packing 28 described above. In this case, the portion corresponding to the female joint piece 3 of the reference pipe P _1, the reference pipe P ₁
Since the female joint piece 3 is lacking, it is not necessary to match the shape of the waterproofing packing 34 in the shape of the female joint piece 3, the male pipe P ₃ joint piece 4
It suffices to have a shape tailored only to that.

[0031] Thus, when the water stop packing 34 is attached, step 9 in the pipe P _1, in the same manner as in step 10 is promoted while injecting wellhead water stopping material 31 as required pipe P _3, mortar after promotion 25 injections are performed.
Incidentally, to propel the same procedure as the pipe P ₃ also pipe P _2, will then penetrate successively natural ground in a similar sequence in relation to the respective pipes adjacent their pipe P _2, the pipe P ₃ below.

In the water stopping method of the present embodiment, the pipe 1
Regardless of the shape of the joint piece provided on the outer peripheral portion of the above, water can be easily stopped by attaching a water-stop packing having a shape matching the shape of the joint piece.

According to this embodiment, even if the joint piece attached to the outer peripheral surface of the pipe has a complicated shape, such as a pipe for a pipe roof, the wellhead can be easily and reliably stopped. Can be. As a result, it is possible to easily prevent the loss and collapse of the sediment from the pipeline when the pipe penetrates into the ground, and it can be said that this is a construction method with an extremely large effect.

[Brief description of the drawings]

FIG. 1 is a side view (a) and a front view (b) of a pipe for a pipe roof according to one embodiment of the present invention.

FIG. 2 is an explanatory view of an embedding procedure of a pipe for a pipe roof.

FIG. 3 is a diagram showing a pipe roof pipe in a connected state.

FIG. 4 is an explanatory view (step 1) of a wellhead stoppage method according to the present embodiment.

FIG. 5 is an explanatory view (step 2) of the well stop method according to the present embodiment.

FIG. 6 is an explanatory diagram (step 3) of a well stop method according to the present embodiment.

FIG. 7 is an explanatory diagram (step 4) of the well stop method according to the present embodiment.

FIG. 8 is an explanatory view (step 5) of the well stop method according to the present embodiment.

FIG. 9 is an explanatory view (Step 6) of the well stop method according to the present embodiment.

FIG. 10 is an explanatory view (step 7) of a wellhead stoppage method according to the present embodiment.

FIG. 11 is an explanatory view (step 8) of the well stop method according to the present embodiment.

FIG. 12 is an explanatory view (step 9) of the well stop method according to the present embodiment.

FIG. 13 is an explanatory view (step 10) of the well stop method according to the present embodiment.

FIG. 14 is an explanatory view (step 11) of a well stop method according to the present embodiment.

FIG. 15 is an enlarged view of step 9;

FIG. 16 is an enlarged view of step 11;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Pipe roof pipe 2 Pipe main body 3 Female joint piece 4 Male joint piece 9 Retaining wall 10 Tip pipe (tunnel excavator) 10a Cutter head 11 Vertical shaft 12 Ground 13 Main pushing device 14 Starter stand 15 Water stop 20 Base plate DESCRIPTION OF SYMBOLS 21 Primary waterproof rubber 22 Holding plate 23 Formwork 24 Temporary plate 25 Mortar 26 Secondary waterproof rubber (elastic body) 27 Holding plate 28 Waterproof packing 28a First packing part 28b Second packing part 29 Stud bolt 30 Nut ( fastening member) 31 wellhead water stopping material 32 2 Tsugitomesui rubber (elastic member) 33 pressing plate 34 waterproofing packing 34a second packing unit first packing part 34b P ₁ reference pipe P _2, P _3, P ₄ adjacent pipe

Claims (4)

[Claims] 1. A wellhead stoppage method for stopping the outer periphery of a penetrating member penetrating into the ground at a starting wellhead, wherein a watertight packing formed by compressively deforming an elastic body by a fastening member is used. A wellhead stoppage method comprising contacting the outer periphery of a member to stop water. 2. The pipe penetrating member is a pipe for a pipe roof having a joint piece on an outer peripheral surface, and the water-stop packing is provided at least around a joint piece of the pipe for a pipe roof and follows the joint piece. 2. The fuel cell system according to claim 1, further comprising: a first packing portion having a shape; and a second packing portion provided adjacent to the first packing portion and having a portion along an arc portion of the pipe for a pipe roof. 3. Wellhead stoppage method. 3. A pipe roof pipe having a joint piece on its outer peripheral surface and partially lacking the joint piece when the pipe roof pipe penetrates into the ground. And (a) a wellhead formed using a watertight packing formed by compressing and deforming an elastic body by a tightening member while being divided so as to have a shape along the joint piece. (B) penetrating the pipe for the pipe roof until the lacking portion of the joint piece is located at the wellhead, and then solidifying the inside of the water-stop packing, and (c) penetrating the pipe. When another pipe for pipe roof adjacent to the pipe for roof is penetrated into the ground, a solidified portion of the pipe for pipe roof that has already penetrated is partially removed to perform each of the steps (a) and (b). Pit water stoppage construction method characterized by performing repeatedly. 4. A waterproof packing formed along the outer peripheral surface of a penetrating member penetrating into the ground, comprising two plates, an elastic body interposed between the plates, and the elastic body A watertight packing comprising: a tightening member that compresses and deforms by clamping through a plurality of plates.