JP2001336388A - Sealing structure, wall body, and wall body constructing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing structure which does not enlarge a shaft and is high in reliability even if improvement of the natural ground is omitted, and to provide a wall body and a wall body constructing method. SOLUTION: An entrance metal 21, a tube 23, and a protective sealing material 25 are arranged in an opening 13 of the shaft 9, and a space stuffing material 33 is filled in the opening. Then, a shielding machine carries out cutting along a cross-sectional area 35, and thereafter water and the like is fed into the tube 23 to inflate the same, to thereby carry out sealing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal structure, a wall, and a method for constructing a wall used in a shaft or the like for shield work.

[0002]

2. Description of the Related Art Conventionally, when constructing a shield tunnel, a shaft was constructed, the ground in front of the shaft was improved, a part of the shaft was crushed, and a shield tunnel was constructed with a shield machine. In addition, a concrete structure in which part of the shaft is reinforced with carbon fiber, etc. without improving the ground, and this part is directly excavated with a shield machine (Nomst method)
Etc.

[0003]

However, when excavating a part of the shaft directly with a shield machine without improving the ground, it is necessary to double the packing for stopping water, and extra space is required in the shaft. It was necessary to secure a large space, and there was a problem that the shaft became large. Further, with respect to the packing provided on the face side, even if there is a trouble such as breakage after the penetration of the shield machine, it is difficult to pull back the shield machine and the like, and improvement of reliability has been demanded.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a highly reliable seal structure, a wall, and a large shaft even if the improvement of the ground is omitted. An object of the present invention is to provide a method of constructing a wall.

[0005]

According to a first aspect of the present invention, there is provided a seal structure provided in advance in a wall, wherein a cavity is provided in the wall, A sealing structure, wherein a member is provided on an inner surface, and the hollow portion is filled with a tube and a filling material.

According to a second aspect of the present invention, there is provided a wall having the seal structure according to the first aspect. The third invention is
A step of providing a temporary retaining wall, a step of excavating the interior of the retaining wall, a step of constructing a vertical shaft having an opening in a part of a side wall inside the retaining wall, and a sealing structure in the opening. And a step of providing a wall.

[0007] A fourth aspect of the present invention is a step of sinking a caisson having a cuttable portion that can be cut by a shield machine on a side surface,
Providing a seal structure on a side surface near the cuttable portion.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 7 are explanatory diagrams of a method for constructing a wall according to an embodiment of the present invention. In FIG. 1, 1 indicates the ground surface, and 3 indicates the ground. A temporary retaining wall 5 is provided in the ground. The temporary retaining wall 5 is made of, for example, reinforced concrete. The temporary retaining wall 5 is constructed by a parent pile horizontal sheet pile method, a sheet pile method, an SMW method, an underground continuous wall method, or the like.

A part of the temporary retaining wall 5 is provided with a substantially disk-shaped cuttable portion 7. The cuttable portion 7 is a portion that can be cut by a shield machine. For example, carbon fiber or the like is used instead of a reinforcing bar.

Next, the inside of the temporary retaining wall 5 is excavated (FIG. 2), and a shaft 9 is provided inside the temporary retaining wall 5. Shaft 9
Is constructed by a forward winding method, a reverse winding method, or the like. The side wall 11 is made of reinforced concrete, and a circular opening 13 is provided in a part thereof.

[0011] Next, as shown in FIG. 4, a wellbore (ring-shaped member) 21 having a convex central section is provided in the opening 13, and a tube 23 is installed inside the wellbore 21.
The wellbore 21 is provided in a ring shape. Further, a protective sealing material 25 is provided so as to face the wellbore 21. The protective sealing material 25 is an FRP material, cloth, clay, styrofoam, pottery, hard paper, or the like.

A pipe 29 is provided in a part of the protective sealing material 25, and a pipe 31 is also provided in the wellbore 21. The tube 31 is connected to a supply source (not shown) such as air or water. A cavity 37 is formed by the wellbore 21 and the protective sealing material 25.

An ordinary concrete 30 is poured into the upper part of the wellbore 21 and a machinable concrete 27 such as foam mortar is filled from below the protective sealing material 25. Then, grease is injected from the pipe 29 as the filling material 33. At this time, the tube 23 is not supplied with water or the like and is not expanded. The filling material 33 may be clay or the like in addition to a gel-like liquid such as grease. Tube 31
It is connected to a supply source (not shown) such as air or water. The tube 23 may be provided in a plurality of layers instead of a single layer. In addition,
FIG. 4 shows an example in a reaching shaft. In the starting shaft, the opening 1
There is no need to cast the machinable concrete 27 in the third.

FIG. 5 shows the seal structure 15
FIG. 6 is a cross-sectional view of the shaft 9 in which is formed;
It is an arrow view of a direction. In FIG. 6, the temporary retaining wall 5 is ignored. As described above, the seal structure 15 is formed by the tube 23, the filling material 33, the wellbore 21, the protective seal material 25, and the like.

The shaft 9 having such a sealing structure 15
Is excavated by the shield machine 16. In FIG. 4, 35
Indicates a cut surface by the shield machine 16. Shield machine 16
Excavates the side wall 11 of the shaft 9 and the cuttable portion 7 of the temporary retaining wall 5.

FIG. 7 shows an excavation by the shield machine 16,
It is sectional drawing of the shaft 9 in the state in which the segment 43 was installed. Immediately after passing the machine face plate of the shield machine 16, the pipe 31
From the air or water is sent to the tube 23, the tube 23 expands and the filling material 33 is extruded into the gap 41,
The tube 23 is pressed directly against the shield machine 16 (or the segment 43) to perform sealing. In this state, the segment 43 in FIG. 7 corresponds to the skin plate of the shield machine 16. Then, when the segment 43 is installed and the shield machine 16 moves, the tube 23 expands by air or water holding the pressure, and the tube 23 expands.
Is pressed directly against the segment 43, and sealing is performed. After the sealing is performed in this manner, the water and the like in the tube 23 are replaced with a curing agent. In addition, the backfill material is injected behind the shield machine 16, and the shield machine 16 and the wellhead are welded to each other with an iron plate.

Next, the configuration of the tube will be described.
FIG. 8 is a schematic configuration diagram of the tube 23, which has a ring shape. The tube 23 is composed of a tubular fabric 53 having an airtight layer 51 on the inner surface. The material of the airtight layer 51 can be selected from a thermoplastic elastomer, a thermoplastic plastic, a synthetic rubber, or the like. In addition, the form of the tubular fabric 53 can be selected from a tubular woven fabric, a circular knit, a circular braid, and the like, and any general synthetic fiber can be used as the material. In particular, when a tubular woven fabric is used, it is desirable to use elastic fibers in order to compensate for the difference in the inner and outer peripheral lengths of the ring shape. In order to provide the airtight layer 51 on the inner surface of the tubular fabric 53, the airtight layer 51 is formed on the outer surface of the tubular fabric 53 by extrusion molding, dipping, or the like, and then the inner surface is turned over to be the outer surface.
The airtight layer 51 can be formed on the inner surface of the tubular fabric 53. Further, it can be obtained by inserting a tubular airtight layer 51, for example, a plastic tube or the like, into the inner surface of the tubular fabric 53. That is, the tube 23 has the same configuration as the fire hose, and the use of the tubular fabric brings about an effect excellent in pressure resistance performance.

FIG. 9 is a sectional view of a joint portion of the tube 23. At one end of the tube 23, the inner airtight layer 5
1 is turned over to the outer surface side, inserted into the other end of the tube 23, and the airtight layers 51 at one end and the other end are joined. As the joining method, a high-frequency fusion method, a thermal fusion method, an adhesion method, or the like is adopted according to the material of the airtight layer 51 as appropriate.

FIG. 10 is a sectional view of the tube 23 shown in FIG.
It is B sectional drawing. An airtight layer 51 is provided on the inner surface of the tubular fabric 53, cushioning materials 55 and 57 are provided on the upper and lower surfaces of the outer surface of the tubular fabric 53, and protective materials 59 are provided on the left and right outer surfaces. Also,
A water-swellable water-stopping material 63 made of a nonwoven fabric or the like is provided on a part of the upper and lower portions of the outer surface of the tubular cloth 53. Cushioning material 55,5
7. The protection member 59 is made of sponge rubber or the like. In FIGS. 8 and 9, illustration of the cushioning members 55 and 57, the protection member 59, and the like is omitted.

FIG. 11 shows a tube 23 arranged in a ring shape. FIG. 12 is an enlarged view of a portion C in FIG.
FIG. 12 is a sectional view taken along the line DD in FIG. 11. As shown in FIGS. 11 and 12, for example, an injection part 71 for injecting water or the like is provided at four places of the tube 23. The injection section 71 is connected to the pipe 31, and the pipe 31 is connected to a water or air supply source (not shown).

As described above, when the tube 31 is arranged and is cut by the shield machine 16, the tube 31 can be slightly swung in the direction perpendicular to the plane of the drawing. Can move a little. In FIG. 13, the tube 23a is in a state before expansion, and when water or the like is supplied, the tube 23a expands to a state shown in the tube 23b. 73 is
This is a position fixing belt for preventing the tube 23 from being dragged when the shield machine 16 moves.

As described above, according to this embodiment, when a horizontal shield tunnel is constructed by a shield machine directly from a shaft, it is not necessary to increase the size of the shaft, and good sealing can be performed. .

Further, since grease of a gel-like liquid is used as the filling material 33, the filling material 33 efficiently seals the gap 41 when the tube 23 expands. FIG. 14, FIG.
5 shows another embodiment of the seal structure 15. In the embodiment shown in FIG. 14, a wellbore 21 and a tube 23 are provided, styrofoam 81 is provided in a ring shape, and then the cuttable concrete 27 is filled.

In the embodiment shown in FIG.
1. The tube 23 is provided, the clay 83 is provided in a ring shape, and then the machinable concrete 27 is filled.
As the clay 83, oil clay or paper clay is used.

FIGS. 16 to 19 show another construction method of the wall. As shown in FIG. 16, a disc-shaped caisson 91 of a first lot is set on the ground surface 1 and is settled (FIG. 17). Further, a cylindrical caisson (second lot) 93 is set on the caisson 91 (FIG. 18) and is settled (FIG. 19). The caisson 91, 93 may have a rectangular cross section.

A part of the caisson 93 includes a cuttable portion 97.
Is provided, the thickness of the cuttable portion 97 is reduced,
A concave portion 95 is formed in a disk shape. The seal structure 15 is provided in the recess 95 in the same procedure as described above.

That is, the well fitting 21, the tube 23,
A protective seal 25 and the like are provided, and the filling material 33 is filled.
Alternatively, a seal structure as shown in FIGS. 14 and 15 may be provided in the recess 95. Thus, the caisson 93 provided with the seal structure is excavated by the shield machine. Then, the tube 23 is expanded to perform sealing. In addition, caisson 9
Although the concave portion 95 is formed in a part of 3, the thickness of the cuttable portion 97 may be equal to or greater than the thickness of the side wall of the caisson 93 without forming the concave portion 95.

In the above description, the case where the seal structure 15 is provided in advance on the starting shaft is described. However, the above-described seal structure may be provided in advance also on the intermediate shaft and the reaching shaft. Also, when a second shield tunnel in the horizontal direction that is orthogonal to the first shield tunnel is constructed from a first shield tunnel in the horizontal direction using a shield machine, as in a sewer tunnel, The aforementioned water blocking structure may be provided in advance in the first shield tunnel in the horizontal direction.

[0029]

As described in detail above, according to the present invention, it is possible to provide a highly reliable seal structure, a wall, and a method of constructing a wall, without increasing the size of the shaft.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a method of constructing a wall body.

FIG. 2 is an explanatory view of a method of constructing a wall body.

FIG. 3 is an explanatory diagram of a method of constructing a wall body.

FIG. 4 is a configuration diagram of a main part of a wall body.

FIG. 5 shows a shaft 9 before excavation.

FIG. 6 is a view taken in the direction of arrows AA in FIG. 5;

FIG. 7 is a configuration diagram of a main part of a wall body after excavation;

FIG. 8 is a schematic configuration diagram of a tube 23.

FIG. 9 is a sectional view of a joint portion of the tube 23.

FIG. 10 is a sectional view showing a detailed configuration of a tube 23.

FIG. 11 is a view showing an arrangement of a tube 23;

FIG. 12 is an enlarged view of a portion C in FIG. 11;

FIG. 13 is a sectional view taken along the line DD in FIG. 11;

FIG. 14 shows a seal structure 15 according to another embodiment.

FIG. 15 shows a seal structure 15 according to another embodiment.

FIG. 16 is an explanatory diagram of a method of constructing a wall according to another embodiment.

FIG. 17 is an explanatory diagram of a method of constructing a wall according to another embodiment.

FIG. 18 is an explanatory diagram of a method of constructing a wall according to another embodiment.

FIG. 19 is an explanatory diagram of a method of constructing a wall according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Ground surface 3 ... Ground 5 ... Temporary retaining wall 7 ... Excavation possible part 9 ... Vertical shaft 11 ... Side wall 13 ... Opening 15 ... Seal structure 16 ... Shielding machine 21 Wellhead fitting 23 Tube 25 Protective sealing material 27 Machinable concrete 33 Filling material 43 Segment 81 Styrofoam 83 ... Clay 91, 93 ... Caisson 95 ... Recess

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Tsutomu Nakao 1-35-1 Awaza, Nishi-ku, Osaka-shi, Osaka Kashima Construction Co., Ltd. Kansai Branch (72) Inventor Takeshi Nakagawa 1-2-chome Moto-Akasaka, Minato-ku, Tokyo No. 7 Inside Kashima Construction Co., Ltd. (72) Inventor Taro Makimoto 3-10-18 Kitahorie, Nishi-ku, Osaka-shi, Osaka Prefecture Inside Ashimori Industry Co., Ltd. A-chome No. 10-18 Ashimori Industry Co., Ltd. F-term (reference) 2D054 AC01 EA07 3J040 BA01 EA21 HA30

Claims (12)

[Claims] 1. A sealing structure provided beforehand inside a wall, wherein a cavity is provided inside the wall, a member is provided on an inner surface of the cavity, and a tube and a filling material are filled in the cavity. A seal structure characterized by the above. 2. The seal structure according to claim 1, wherein a wall inside the cavity is made of machinable concrete. 3. The seal structure according to claim 1, wherein said member is metal. 4. The seal structure according to claim 1, wherein the filling material is a gel-like liquid or clay. 5. The seal structure according to claim 1, wherein a protective sealing material is provided on one surface of the hollow portion facing the member. 6. The protective sealing material includes an FRP material, a cloth,
The seal structure according to claim 5, wherein the seal structure is made of clay, styrofoam, pottery, or paper. 7. The seal structure according to claim 1, wherein the tube is formed by joining both ends of a tubular fabric having an airtight layer on an inner surface. 8. A wall having the seal structure according to claim 1. 9. A step of providing a temporary retaining wall, a step of excavating the inside of the retaining wall, a step of constructing a shaft having an opening in a part of the side wall inside the retaining wall, Providing a sealing structure at the opening. 10. A wall body comprising: a step of sinking a caisson having a cuttable portion that can be cut by a shield machine on a side surface; and a step of providing a seal structure near the cuttable portion. How to build. 11. The method according to claim 10, wherein the seal structure is provided in a concave portion on a side surface. 12. The method for constructing a wall according to claim 9, wherein the seal structure has a tube and a filling material provided in a hollow portion.