JPH05295996A - Cut-off method of tunnel and shield unit - Google Patents

Abstract

PURPOSE:To keep off a leak of water so efficiently and surely on a shield method. CONSTITUTION:A sheet inserting space 21, piercing through the inside and outside of it, is installed in an outer shell 2, while a cut-off sheet 29 in a form being free of delivery from this space 21 is supported in roll form by a roll sheet holder 11, and plural pieces are installed along an inner circumferential surface of the outer shell 2 in advance. In parallel with digging and lining build-in work by means of a shield unit 1, plural cut-off sheets 29 is delivered to the rearside in the digging direction as joining a welding area adjacent in the tunnel inner circumferential direction by means of a welding unit 12, and then these cut-off sheets are set up so as to cover the whole part of outer periphery 30a of a segment 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel which is suitable for excavating a tunnel using a shield device and applying it to a shield construction method in which a lining is continuously arranged from the inside of the shield device to the rear thereof. The present invention relates to a water stopping method and a shield device.

FIG. 8 is a diagram showing an example of a water blocking structure of a conventional shield tunnel, and FIG. 9 is a diagram showing an example of segments used in the water blocking structure shown in FIG.

2. Description of the Related Art Generally, in the shield construction method, as shown in FIG. 8, a segment 42 and a segment piece 43 are assembled and joined at a rear portion shown in the right portion of FIG. A tunnel space 44 is formed in the segment 41 thus built up following the shield device 41. In such a shield construction method, the pore water in the ground and the backfill material are used in the tunnel space 4
In order to prevent the leakage into the inside of No. 4, the following water leakage prevention measures are taken. That is, the shield device 41
In order to prevent water from leaking from the connection between the segment 42 and the segment 42, a tail seal 45 composed of a wire brush or the like is provided at the rear end of the device 41 in FIG. A gap 49 between the inner circumference 46a of the skin plate 46 and the outer circumference 42a of the segment 42 is sealed.
On the other hand, the segment 4 that is the lining member of the tunnel space 44
2 includes the segment pieces 4 as shown in FIG.
3, the joint surface 43a with the adjacent segment piece 43
Grooves 47 for arranging the sealing material are factory-machined in (the four side end faces of each segment piece 43 in the directions of arrows A and B in FIG. 8 and before and after the plane of FIG. 8), and the grooves 47 are suitable. Between the segment pieces 43, 43 where the sealing material is adjacent, the sealing material for stopping water is attached or filled in the tunnel space 44 or attached or fitted in advance in an appropriate work yard outside the mine, for example. The segment piece 43, so that
That is, water leakage from the lining side in the tunnel space 44 is prevented.

[0003]

However, the sealing material for preventing water leakage on the side of the segment 42 is installed in the groove 47 formed along the joint surface 43a of each segment piece 43 in the tunnel space 44. The work of mounting or filling is very time-consuming and inefficient. Therefore, if the sealing material is attached or fitted outside the mines, the segment piece 43 will be sealed from the piece 43 even with great care during storage or transportation into the shield device. It is possible for the material to peel off or break, necessitating some repair. But,
If all the sealing materials are checked and an attempt is made to repair them completely inside the shield device 41 that has only a very narrow space, it will hinder other work.
It's very bad. Further, since the tunnel constructed by the shield device 1 may have a curved portion or the entire segment 42 may be deformed in a bending manner, the skin plate 46 and the segment 4 described above may be deformed.
The width of the gap 49 between the two is not always kept constant, and therefore the tail seal 45 during the propulsion of the shield.
However, if the size of the width of the gap 49 cannot be overcome, water may flow into the tunnel space 44 from here, which hinders the tunnel construction work. For this reason,
Although it is extremely difficult to completely prevent leakage of water in such shield tunnels, allowing the leakage of water into the tunnel space 44 and treating it as wastewater requires a great deal of expense for drainage. However, it is a danger that accelerates the progress of ground subsidence as well as the weakening of the tunnel structure, and it is dangerous for everyone to avoid it. Therefore, there is a method to provide watertightness to the separate waterproofing work by providing a separate waterproofing work at the time of secondary lining for guarantee after the completion of construction. , The construction period and cost corresponding to this are required separately. Therefore, in view of the above circumstances, the present invention enables reliable tunnel water stoppage work to be performed in parallel with excavation work and segment building work during shield propulsion without reducing the efficiency of shield construction. The present invention provides a method of stopping water in a tunnel and a shield device which are designed to prevent water leakage economically and reliably.

[0004]

That is, the present invention is based on the ground (3
9) Inside the shell body (2) that can be propelled inside, a plurality of water blocking sheets (29) each formed in a strip shape are constructed so as to be adjacent to each other along the inner circumferential direction of the tunnel. It should be stored in the outer periphery (30a) of the tunnel lining (30) so that it can be freely extended, and the shell body (2) can be propelled into the ground (39) to adjust the amount of movement of the shell body (2). A tunnel lining (30) for a corresponding distance is constructed and arranged so as to be connected to the rear side of the shell body (2) with respect to the propulsion direction,
The plurality of water blocking sheets (29) are replaced with the water blocking sheets (2).
Each edge portion (29a) of 9) is joined to the edge portion (29a) of the adjoining water blocking sheet, and is extended to the rear side with respect to the propelling direction of the shell body (2) so as to cover the tunnel cover. The joined body (290) of the water blocking sheet (29) is attached to the work (30) and the outer circumference (30) of the tunnel lining (30).
Install a) so that it covers the entire circumference,
Composed. Further, it has a shell body (2) that leads the tunnel lining (30), and excavation propulsion means (3), (7) are provided in the shell body (2), and the shell body (2) is provided. The sheet feeding part (21) is provided so as to penetrate the inside and outside of the shell body (2), and the sheet holding means (11) is provided in the shell body (2), and the water blocking sheet (29) formed in a band shape. Are installed along the inner peripheral surface of the shell body (2) in such a manner that they can be freely extended to the outer periphery (30a) portion of the tunnel lining (30) through the sheet delivery portion (21). And the shell (2)
Joining means (1) for joining the water blocking sheet (29) therein
2) is provided in such a form that the water blocking sheet (29) fed from the adjacent sheet holding means (11) can be joined to the shield device 1. Further, the shield device (1) may be constructed by providing the shell body (2) with a backfill material injection means (32) arranged in front of the sheet feeding portion (21) in the direction of excavation. .. In addition,
Numbers in parentheses are for convenience of reference to corresponding elements in the drawings, and thus the present description is not limited to the description in the drawings. below

The same applies to the column of [Operation].

[0005]

With the above-mentioned structure, according to the present invention, the joined body (290) of the water blocking sheet (29) covers the outer circumference (30a) of the tunnel lining (30) over the entire circumference. It acts to isolate the lining (30) from the ground (39). Further, when the shield device (1) propels through the excavation propulsion means (3) and (7), the waterproof sheet (2) having a length corresponding to the propulsive movement amount of the shield device (1).
The sheet holding means (11) feeds 9), and the joining means (12) joins the water blocking sheet (29) fed by the water blocking sheet holding means (11). further,
When the backing material (33) is supplied to the backing material injecting means (32), the supplied backing material (33) is supplied with water from the water stop sheet (29) and the ground (39). ) Acts to be injected between.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing an embodiment of a shield device used in a tunnel water stopping method according to the present invention, FIG. 2 is an enlarged view showing an example of a tail seal portion in the shield device shown in FIG. 1, and FIG. 1 and III of FIG. 1, FIG. 4 is I of FIG.
V, IV arrow view, FIG. 5 is a V arrow view of FIG. 2, FIG. 6 is VI of FIG.
FIG. 6 is a view as seen from the direction of arrow VI, and FIG. 7 is a diagram showing an example of a water blocking sheet used in the water blocking method for a tunnel according to the present invention.

As shown in FIG. 1, the shield device 1 has an outer shell 2 formed in a cylindrical shape. The outer shell 2 is inserted into the ground 39 by the shield device 1 itself, that is, the excavation direction, that is, the shield. It is arranged at the head portion shown at the left end of FIG. 1 of a tunnel 40 that is excavated and formed in a laterally rolling columnar shape that extends in the directions of arrows A and B, which are the directions of propulsion. The outer shell 2 is composed of a skin plate 2A arranged on the left side of FIG. 1 which is the front side of the shield device 1 and a tail skin 2B arranged on the rear side of the skin plate 2A, that is, on the right side of FIG. 1 (direction of arrow B). The skin plate 2A and the tail skin 2B are connected and integrated in such a manner that they cannot be separated from each other by a girder portion 2c that supports the entire shield device 1. In the girder portion 2c, shield propulsion jacks 7 for propelling the shield device 1 are arrayed along the inner peripheral surface of the skin plate 2A, and the shield propulsion jacks 7 each have a ram 7a on the rear side. It is provided in such a manner that it can be driven to project in the direction of arrow B in FIG.

The outer shell 2 is, as shown in FIG. 1, at the connecting portion between the skin plate 2A and the tail skin 2B,
The outer diameter of the front end (left end in FIG. 1) of the tail skin 2B is reduced so as to be smaller than the inner diameter of the rear end (right end in FIG. 1) of the skin plate 2A. The front end portion of the skin 2B is inserted into the rear end portion of the skin plate 2A, the sheet insertion space 21 is provided between the two 2A and 2B, and the waterproof membrane structure 290 which is a joint body of the waterproof sheet 29 described later is fed out. The shape is such that it is formed in an annular shape with a slight width. As shown in FIG. 2, the seat insertion space 21 has its front end side in the direction of arrow A in FIG. 2 open to the inside of the skin plate 2A (lower side in FIG. 2), while its rear end is in the direction of arrow B. The end is formed as an opening outside the tail skin 2B (upper side in FIG. 2). Therefore, in the shield device 1, at the connecting portion between the skin plate 2A and the tail skin 2B, the outer shell 2 is formed via the seat insertion space 21.
The inside and the outside of the box are shaped to penetrate in a ring shape substantially along the directions of arrows A and B, which are the shield propelling directions.

The front end portion 2 on the left side of FIG. 1 of the skin plate 2A
Aa has a disk-shaped outer diameter that is substantially the same as the outer diameter of the skin plate 2A.
A cutter disk 3 for excavating the machine 9 is provided so as to be rotatable about a rotation center CT1 in FIG. 1 through a drive motor 3b in the directions of arrows C and C ′ intersecting the plane of FIG. A large number of cutter blades 3a are attached to the front surface, which is the left side surface in FIG. 1, with their cutting edges facing the front of the shield device 1, that is, the face 40a of the tunnel 40, respectively. A partition wall 5 is provided in the front part shown in the left part of FIG. 1 in the skin plate 2A so as to block the space inside the skin plate 2A in the front-back direction, that is, in the left-right direction of FIG.
In the space inside the skin plate 2A, an excavated earth and sand filling space 37 is formed in a disk shape between the partition wall 5 and the cutter disk 3. At the bottom of the partition wall 5 in FIG.
However, the earth and sand sampling port 6a is fitted in the lower part of the digging and filling space 37, and the screw conveyor 6 is, as is well known, a screw 61 inside the conveyor 6 as shown in FIG. By rotating in the directions of the arrows D and D ′, the excavated earth and sand formed by the cutting face 40a, that is, the slip 36, can be conveyed to the rear side of the tunnel 40 shown in the right part of FIG.

Meanwhile, in the tail skin 2B, as shown in FIG.
1, the erector 9 is located at the rear side of the girder portion 2c, that is, as shown on the back side of the screw conveyor 6 in FIG.
An arm 9a, which is provided so as to be fixed to the right side or the like and is capable of gripping the segment piece 31, is provided in the erector 9 in a tunnel inner circumferential direction (arrow P shown in FIG. 6, which is a direction intersecting the plane of FIG. 1). 1 that is rotationally positionable in the Q direction) and is radial with respect to the axial center CT0 of the tunnel 30 that substantially coincides with the shield propelling directions indicated by arrows A and B in FIG.
It is provided so that it can be driven to project and retract in the directions of arrows E and F. Further, on the upper side of the erector 9 in FIG. 1, there are provided a hydraulic motor 9b for driving the erector 9 to rotate, a rear workbench 9c, and the like, and these hydraulic motors 9b, the rear workbench 9c, etc. are the girders. It is mounted and supported on the portion 2c.

Also, on the inner rear part of the tail skin 2B,
1 ring width is L1 and its cross-sectional shape is tail skin 2
The segment 30, which is a tunnel lining member and is formed in a rollover cylindrical shape having an outer diameter slightly smaller than the inner diameter of B, is not shown in the rear side of the shield device 1 (direction of arrow B) and in the right part of FIG. 1. The shield device 1 is constructed and arranged so as to be connected to the starting pit opening 30c. As shown in FIG. 1 to FIG. 6, the segment 30 includes a plurality of segment pieces 31 in the axial center CT0 direction of the tunnel 40 and in the circumferential direction about the axial center CT0 (that is, the shield propelling direction in FIG. 1A). ,
The B direction and the inner circumferential direction of the tunnel, which are the directions of arrows P and Q in FIG. 6, are joined to each other and are assembled into a cylindrical shape by joint bolts. The front end 30b of the segment 30 is shown at the left end of FIG. Has a shape in which the segment 30 is inserted into the tail skin 2B by about one ring and can come into contact with the ram 7a of the shield propulsion jack 7.

A tail void 35 is provided at least between the outer periphery 30a of the segment 30 and the pit wall 40b formed by the cutter blade 3a of the shield device 1 by excavation.
A gap corresponding to the plate thickness of A and the tail skin 2B is inevitably formed in an annular shape, and the tail void 35 has a waterproof film structure 29 described later as shown in FIG.
0 is arranged in a cylindrical film shape so as to cover the entire outer periphery 30a of the segment 30. Between the waterproof membrane structure 290 and the pit wall 40b, for example, cement-based grout material 3 is used.
3 is back-filled and the back-filling material 33 is such that its front end side unconsolidated portion is continuous to the discharge port 32a of the injection nozzle 32 for injecting the back-filling material 33 shown at the left end of FIG. Is becoming As shown in FIG. 2, the injection nozzle 32 penetrates the skin plate 2A and directs its discharge port 32a rearward, that is, toward the tail void 35 side.
1 is provided in front (on the side of arrow A), and a grout supply pump (not shown) is connected to the lower side of the injection nozzle 32 in FIG.

The waterproof membrane structure 290, as shown in FIG.
6 has a plurality of water blocking sheets 29 arranged in a manner of covering the outer circumference 30a of the segment 30 along the inner circumferential direction of the tunnel shown by arrows P and Q, and the water blocking film structure 290 has each water blocking sheet 29. The left and right end portions adjacent to each other along the inner circumferential direction of the tunnel (the water blocking sheet 2 adjacent in the directions P and Q in FIG. 6).
Adjacent portions 9 and 29) are joined and integrated by overlapping each other by a predetermined width L4. That is, each waterproof sheet 29
As shown in FIG. 7, the water blocking sheet 29 is formed into a band shape having a predetermined width L2, and the water blocking sheet 29 has a width L2 of the sheet 29 at both end band edges, that is, an arrow K in FIG. The welding areas 29a and 29a are set to have widths L3 from both ends in the L direction, respectively, and substantially match the overlapping width L4 of the water blocking sheets 29 and 29 adjacent to each other. Welding area 29
As shown in FIG. 6, a and 29a are weld-bonded to the welding regions 29a and 29a of the water blocking sheets 29 and 29 on both sides which are adjacent to each other along the tunnel inner circumferential direction (arrow P and Q directions). Therefore, the adjacent waterproof sheets 29, 29 are integrally formed. Further, the water blocking sheet 29 has a widthwise middle portion indicated by arrows K and L in FIG.
A reinforcing region 29b is formed in a portion other than 29a so as to have a thickness W1 shown in FIG. Welding area 29 of waterproof sheet 29
a and 29a are made of a sheet-like material having waterproofness, flexibility and thermoplasticity, such as synthetic resin or rubber such as polyethylene or EVA, or other composite material,
On the other hand, in the reinforced area 29b of the waterproof sheet 29, as shown in FIG. 7, a reinforcing material 291 made of steel wire, resin, woven cloth, non-woven cloth, composite reinforced fiber material or the like constitutes welded areas 29a, 29a, for example. The sheet-shaped material is sandwiched in the thickness of the sheet-shaped material, is attached to the surface of the sheet-shaped material, or is mixed during the processing.
It is arranged over the entire surface 9b or over the entire waterproof sheet 29 including the reinforced area 29b.

By the way, the skin plate 2A shown in FIG.
At the rear end shown at the right end, as shown in FIG. 1, a sheet supply mechanism 10 for disposing a water blocking film structure 290 in the tail void 35 is provided.
Is a plurality of roll sheet holders 11 mounted on the inner peripheral surface of the skin plate 2A so as to be aligned along the inner peripheral direction shown by the arrows P and Q in FIG. 3, that is, the direction corresponding to the inner peripheral direction of the tunnel. Have The roll sheet holder 11 includes
As shown in FIG. 3, the water blocking sheet 29 has its outermost rear end portion, which is the leading end thereof, rolled in such a manner that it can be paid out to the right side (direction of arrow B) in FIG. 1 which is the rear side of the shield device 1. Roll sheet holder 11
From the rear side of the water blocking sheet 29 (arrow B)
The part (1) covers the outside of the tail skin 2 </ b> B so as to penetrate the seat insertion space 22. A further rear portion of the water blocking sheet 29 that covers the outside of the tail skin 2B is provided so as to extend over the entire length of the tail void 35 in the directions A and B, that is, the water blocking sheet 29.
Is a shape in which the rearmost end portion (the portion not shown on the right side of FIG. 1) of the water blocking sheet 29 extends and extends to the wellhead 40c.
The water blocking film structure 290 is configured.

Further, as shown in FIG. 2, at the connecting portion of the skin plate 2A and the tail skin 2B, the seat receiving port of the seat insertion space 21 is located on the arrow A side (the space 2).
1, the water blocking sheet 29 fed from the roll sheet holder 11 can be welded and welded along the shield propelling direction indicated by arrows A and B, that is, the tunnel longitudinal direction. Shape welding device 1
As shown in FIG. 3, the number 2 of the welding devices 2 is provided along the tunnel inner circumferential direction shown by the arrows P and Q in FIG. As shown in FIG. 2, a pair of upper and lower brackets 13 is formed.
It has A (upper side in FIG. 2) and 13B (lower side in FIG. 2). The upper surface of the bracket 13A shown in FIG. 2, that is, the bottom surface, that is, the upper surface of FIG. 2, is fixedly attached to the inner peripheral surface of the rear end portion shown at the right end of FIG. 1 of the skin plate 2A, and the lower bracket 13B of FIG. The rear surface of the bracket 13B, that is, the outer surface of the bottom portion extended to the right of FIG. 2, that is, the upper surface of FIG. 2, is fixedly attached to the inner peripheral surface of the front end portion of the tail skin 2B shown at the left end of FIG. 1, that is, the lower surface of FIG. There is. In addition, skin plate 2
A and the tail skin 2B are connected and integrated so that they cannot be separated from each other via the girder portion 2c, as already extended, and further, not shown in the brackets 13A and 13B, for example, a bracket connecting means made of a spring member. 2 are provided in such a manner that the upper and lower brackets 13A and 13B shown in FIG. The gap 12a
When the waterproof sheet 29 is not inserted into the gap 12a, it is connected to the gap 12a through the bracket connecting means.
The vertical width can be freely widened, and at least the waterproof sheet 29
The width is thinner than the thickness of two sheets. The front portions of the brackets 13A and 13B shown on the left side of FIG.
Is formed in a substantially columnar shape and is rotatably supported in a direction parallel to the plane of FIG.
5 is rotatable about axes of rotation 151 and 151, respectively, in the directions of arrows G1 and G2 and in the directions of arrows G3 and G4 around the rotation centers CT4 and CT4 ′ shown in FIG. 5, as shown in FIG. Bearings are supported by the brackets 13A and 13B in various shapes. Figure 2 A pair of upper and lower guide rollers 1
As shown in FIG.
Flanges 152, 152 having a shape larger than the outer diameter of the roller 15 are provided on one side surface of each of the rollers 5, 15 in a staggered manner such that the positions of the flanges 152, 152 are opposed to each other. That is, the flange 152
5 for the guide roller 15 on the bracket 13A side and FIG. 5 for the guide roller 15 on the bracket 13B side.
Formed and arranged on the left side. In the rear portion of the brackets 13A and 13B shown on the right side in FIG. 2, press rollers 16 and 16 having a pair of shapes shown in the upper and lower sides of FIG. 2 are circles slightly larger in diameter than the cylindrical main body portion of the guide roller 15. As shown in FIG. 4, the press rollers 16 and 16 are formed in a columnar shape and are supported so as to be rotatable in the direction parallel to the paper surface of FIG. 2, that is, via the shafts 161 and 161 as shown in FIG. Bearings are supported by the brackets 13A and 13B so as to be rotatable in the directions of arrows H1 and H2 and the directions of arrows H3 and H4 in FIG. 4 about the centers of rotation CT5 and CT5 ′, respectively. As shown in FIG. 4, the press rollers 16 and 16 are formed such that their diameters do not change in the left-right direction in FIG.
No part is provided. Further, as shown in FIG. 2, in the welding device 12, the water blocking sheet 29 is provided between the guide rollers 15 and 15 and the press rollers 16 and 16, respectively.
A hot iron 1 of a form capable of welding, that is, heating and melting the two water blocking sheets 29, 29 at a predetermined temperature to join them together.
7, 17 are provided so as to be fixedly attached to the brackets 13A, 13B, respectively, and a power source (not shown) is connected to the hot irons 17, 17. Then, in the welding device 12, a gap formed between the guide rollers 15 and 15, the hot irons 17 and 17 and the press rollers 16 and 16 in the vertical direction in FIG. 12a
Is formed in such a manner that at least two welded areas 29a of the water blocking sheet 29 can overlap and pass through, and the gap 1
2a communicates with the outer side of the outer shell 2 in the radial direction, that is, the ground 39 side, through a sheet insertion space 21 at the connecting portion between the skin plate 2A and the tail skin 2B. In the gap 12a, the water blocking sheets 29 are overlapped inward and outward (in the vertical direction in FIG. 2) with the adjacent welded areas 29a and 29a of the water blocking sheet 29 of the part fed out from the roll sheet holder 11. In the water blocking sheet 29, a plurality of the water blocking sheets 29 on the rear side (arrow B side) of the gap 12a of the welding device 12 are integrated. Then, the waterproof membrane structure 2
90 make up.

Further, as shown in FIG. 2, the sheet insertion space 21 on the rear side (right side in FIG. 2) of the welding device 12 is made of a thin plate such as Teflon which is excellent in wear resistance and sliding property. The plates 22a, 22b, and 22c include inner and outer peripheral surfaces (lower surface and upper surface in FIG. 2) at the rear end of the skin plate 2A and the reduced diameter portion (the seat insertion space 21 in FIG. These plates 22a, 22 are provided in a thin annular shape by being attached to the outer periphery (the upper surface in FIG. 2) of the opening portion shown in the right part).
Of the b and 22c, the plate 22b attached to the outer peripheral side (upper surface in FIG. 2) of the rear end portion of the skin plate 2A has a rear end portion formed in a spring shape and further rearward from the rear end surface of the skin plate 2A (see FIG. 2 It is projected to the right). The spring elastic force of the protruding rear end portion of the plate 22b is radially inward of the outer shell 2, that is, the arrow J in FIG.
Direction (direction corresponding to the arrow E direction which is the inner side of the tunnel cross section), that is, the plate 2
2b has a shape to constantly press the plate 22c.

Further, as shown in FIG. 2, a seal mechanism 20 is provided in the seat insertion space 21 so as to seal the inside and outside of the outer shell 2 of the shield device 1 in the seat insertion space 21. As shown in FIG. 2, a bellows 23, which is made of an elastic member, is provided in the sheet insertion space 20.
1 is arranged in an annular shape so as to substantially occupy 1. The bellows 23 has a large number of protrusions 231 on the outer surface side (upper surface side in FIG. 2).
However, in a form in which the respective outer tips (upper ends in FIG. 2) of the respective protrusions 231 are directed rearward (rightward in FIG. 2) indicated by the arrow B, the directions A and B in the front-rear direction (the left and right directions in FIG. 2). Are formed in parallel with each other, and a large number of ridges 231 are provided inside thereof (lower side in FIG. 2).
The inside of the planar portion 232 supported by the inside (lower side in FIG. 2) is a pressurizing space 2 having a shape capable of storing a pressurizing fluid such as air or water.
5A and 25B are arranged side by side in the front-rear direction, that is, in the left-right direction in FIG.
Each is formed in an annular shape. Figure 2 of bellows 23
The inner peripheral surface 23a shown at the lower end is fixed and adhered to the outer peripheral surface of the front end portion (left end portion in FIG. 2) of the tail skin 2B in the seat insertion space 21, and is added to the front end portion (left end portion in FIG. 2) of the tail skin 2B. Nozzle holes 2e and 2d, which are openings of the pressure spaces 25A and 25B, are formed by penetrating the inside and the outside of the tail skin 2B in the radial direction in FIG. A fluid supply means (not shown) is connected to each of the nozzle holes 2e and 2d in a form capable of supplying the low pressure fluid 26A and the high pressure fluid 26B to the pressurizing spaces 25A and 25B of the bellows 23 via valves 27A and 27B, respectively. ing.

Since the shield device 1 has the above-described structure, the shield device 1 is used for the tunnel 50.
In order to construct the above, first, the shield device 1 is launched into the ground 39 from a vertical shaft or the like. At this time, the water blocking sheet 29 is already wound around each roll sheet holder 11, and the water blocking sheet 29 is placed outside the outer shell 2 via the sheet insertion space 21 as shown in FIG. When pulled out, the leading end of the sheet 29 is located behind the tail skin 2B. Therefore, a plurality of water blocking sheets 29 are installed in the tunnel 50.
This is stretched so as to be along the mine wall 40b in a shape corresponding to the cross-sectional shape, and the leading end of the water blocking sheet 29 is temporarily temporarily fixed to the pit 40c or the like. In this way, the shield device 1 is propelled from the wellhead 40c in the direction of arrow A of the ground 39, and the segment 30 is stretched and temporarily fixed to the wellhead 40c and the like in the shield device 1 so as to follow it. The tunnel 50 is constructed by sequentially joining and assembling the segments 30 inside the plurality of water blocking sheets 29 which are not yet joined to each other and are assembled in an annular shape. Although the shield device 1 seeks a propulsive reaction force to a reaction force stand temporarily installed in a shaft or the like at the initial stage of its start, the shield device 1 excavates and forms a tunnel 40 to some extent, and a segment 30 is formed in the tunnel 40. And the segment 30
Is fixed to the ground 39 via the grout material 33 or the like, as shown in FIG. 1, the shield is obtained by obtaining a propulsive reaction force from the front end 30b of the segment 40 already fixed to the ground 39. Promote the device 1.

In order to cause the shield device 1 to propel the ground 39, first, as shown in FIG.
The rear end portion (end on the arrow B side) of the ram 7a is brought into contact with the front end 30b (end on the arrow A side) of the segment 30. In this state, the cutter disk 3 is rotated through the drive motor 3b to the center of rotation CT.
When the cutter blade 3a is driven to rotate in the direction of arrow C or C ′ in FIG. 1 around the center 1, the segment of the cutter blade 3a which is already fixed to the ground 39 via the grout material 33 or the like is reversed from the front end 30b thereof. The face 40a is pressed with a predetermined contact pressure so as to obtain a force, and the cutter blade 3a
The ground 39 is excavated in a shape corresponding to the outer diameter of the cutter disk 3 by the pressing force and the rotating operation. Thus, face 4
0a advances by the amount by which the cutter blade 3a is rotated and pressed by the drive motor 3b and the shield propelling jack 7, and the shield device 1 as a whole propels in the direction of the arrow A by a distance corresponding to this. The tunnel 40 is formed by the distance corresponding to the propulsion movement amount of 1.

When the shield device 1 is propelled in this way, the gap 36 formed by the cutting face 40a by excavating the ground 39 once enters the excavated earth and sand filling space 37 arranged behind the cutter blade 3a (arrow B direction). It becomes a form to be reserved and filled, and as the shield device 1 is propelled in the direction of arrow A, the partition wall 5 presses the gap 36 reserved and filled in the excavated earth and sand filling space 37 in the direction of arrow A. .. Then, the gap 36 retained and filled in the excavated earth and sand filling space 37 causes the cutting face 40a to move toward the arrow A by the propulsive force of the shield device 1 itself.
It becomes the shape to push in the direction, and this makes the face 40
The a is pushed in the direction of arrow A and is prevented from collapsing in the direction of arrow B, thus ensuring stability during excavation. Therefore, the pore water in the ground 39 at the front side (left side in FIG. 1) of the shield device 1 during the excavation work is thus prevented from entering the shield device 1 through the face 40a. In addition,
The gap 36 that has been temporarily filled in the excavated earth and sand filling space 37
The remaining surplus retained in the excavated earth and sand filling space 37 of the slot 36 is the earth and sand sampling port 6 of the screw conveyor 6.
a, and the screw 6 of the conveyor 6
1 rotates around the rotation center CT2 in FIG. 1 in the direction of the arrow D or D ′, and is unloaded to the rear side of the tunnel 40 shown in the right part of FIG.

On the other hand, when the shield device 1 propels in the ground 39 in the direction of arrow A as described above, the segment front end 3
The ram 7a of the shield propulsion jack 7 seeking a reaction force to 0b projects to the rear side (arrow B direction side) shown in the right side of FIG. 1, and together with this, the front side of the segment front end 30b shown in the arrow A direction of FIG. 1 left side), a new segment 30
A space (not shown) where one ring can be built is gradually formed. Therefore, when the shield device 1 has propelled in the direction of the arrow A by the width L1 of one ring of the segment 30, the ram 7a in the protruding state is selectively and backwardly driven in the direction of the arrow A to open the jack 7. The segment piece 31 to be newly built is gripped by the arm 9a via the erector 9, and the arm 9a is rotated in the direction intersecting the plane of FIG.
1 is an axial direction C of the segment 30 which has already been installed through a joint bolt etc.
Join in a form that matches T0. Then, segment 3
0 means that the width L1 for one ring is extended in the shield device 1. In this way, when the segment 30 is constructed and extended so as to follow the propulsion of the shield device 1, the segment 30 is always provided on the rear side of the shield device 1 (the arrow B side).
Is connected. From this state, the shield propelling jack 7 is driven rearward again, that is, in the direction of arrow B, and the rear end of the ram 7a (the end on the arrow B side) is brought into contact with the front end 30b of the newly constructed and extended segment 30. Then, the shield device 1 can again obtain a reaction force from the segment 30. In this way, by pushing the shield device 1, the ground 39 is cut open and the cutting face 40 is cut.
a is advanced in the direction of arrow A in FIG. 1 to form the tunnel 40 by the amount of forward movement of the face 40a, and the tunnel 40 is connected to the rear side of the shield device 1 at the rear part of the shield device 1. The segment 50 is built into the tunnel 40 by sequentially assembling and joining the segment piece 31 through the joint bolt, the water stop plate, etc., and the tunnel 50 is constructed by repeating the above-described work. It will be built smoothly.

By the way, as described above, the shield device 1
When propelling in the direction of arrow A in the ground 39, the outer shell 2, that is, the skin plate 2A and the tail skin 2B, moves in the direction of arrow A with respect to the ground 39, and accordingly, a plurality of roll sheet holders. Each of the water blocking sheets 29, which are wound around and mounted on the roll No. 11 and whose leading ends are temporarily fixed to the wellhead 40c, rotate in the direction of the arrow M around the winding core 111, and the roll sheet holder 11 Behind (direction of arrow B)
The length corresponding to the amount of propulsive movement of the shield device 1 is fed to the side all at once. Then, the roll sheet holder 11
Each of the water blocking sheets 29 fed out from the rear side (arrow B direction) side moves relatively rearward (arrow B direction) with respect to the roll sheet holder 11 moving forward (arrow A direction). At this time, the water blocking sheet 29 passes through the gap 12a of the welding device 12 from the arrow A direction side in FIG. 2 toward the B direction side as shown in FIG.

The water blocking sheet 29 is provided in the gap 12 of the welding device 12.
When passing through a, at the adjoining portions of the water blocking sheets 29, 29 which are adjacent along the tunnel inner circumferential direction in the directions of arrows P and Q in FIG. 3, first, as shown in FIG. The right end of the water sheet 29 is on the bracket 13A side (that is, FIG. 5).
Abutting on the flange 152 of the upper guide roller 15,
The left end of the waterproof sheet 29 on the right side of FIG. 5 is the bracket 13B.
Side (that is, the lower side of FIG. 5) of the guide roller 15 of the flange 15
2 in contact with the welding area 29a shown in FIG.
29a are intimately stacked on top and bottom in FIG. Then, in this state, as shown in FIG. 5, the guide rollers 15 and 15 have their shafts 151 and 151 whose rotation centers are CT4 and CT, respectively.
It rotates in the G2 and G3 directions around 4 '.
Then, the rotation operation of the guide rollers 15 and 15 and the bracket 13A supporting the guide rollers 15 and 15,
The two sheets 29, 29 are welded to each other by the welding regions 29a, 29a because 13B is constantly urged in the direction toward each other by the bracket connecting means (not shown).
Are closely delivered from between the guide rollers 15, 15 to the arrow B direction side which is the rear side in the shield propulsion direction (back side of the plane of FIG. 5).

From between the guide rollers 15 and 15, the direction of the arrow B which is the rear side in the shield propulsion direction (the back side of the plane of FIG. 5).
As shown in FIG. 2, the water stopping sheets 29, 29 sent out to the heat roller 17 are arranged in the direction of the arrow B, which is the rear side of the guide rollers 15, 15 in the shield propelling direction. Will pass through. Then, since the brackets 13A and 13B are urged in a direction in which they approach each other via the bracket connecting means (not shown) of the welding device 12, the hot irons 17 and 17 are moved to the hot iron 1
Welding areas 29a, 29 passing through the gap 12a between 7, 17
The two water blocking sheets 29, which are vertically stacked in a form in which a is closely contacted, are sandwiched from above and below in FIG. 4, so that each of the welding areas 29a and 29a is heated and melted at a predetermined temperature and the trowel Heat-welding in the form of diaper. Thus, the welding area 29
a, 29a Two water-stop sheets 29, 29 to which heat welding is performed
Is further sent to the arrow B direction side (the back side of the paper of FIG. 4) which is the rear side in the shield propulsion direction, and is cooled during the transfer, while passing through the gap 12a between the press rollers 16, 16 in the arrow A direction side. To B direction. Then, the press rollers 16 and 16 have their shafts 16 as shown in FIG.
1, 161 rotate in the directions of arrows H2 and H3 around the rotation centers CT5 and CT5 ′ in FIG. 4, respectively, and the two water blocking sheets 2 are rotated by the rotation operation of the press rollers 16 and 16.
Reference numerals 9 and 29 denote the direction of the arrow B, which is the rear side in the shield propulsion direction, between the press rollers 16 and 16 (the back side of the plane of FIG. 5),
That is, it is sent out to the rear side (direction of arrow B) of the welding device 12. At this time, since each of the press rollers 16 and 16 is formed to have a diameter slightly larger than that of the guide roller 15, the gap 12a between the press rollers 16 and 16 is larger than that between the guide rollers 15 and 15 in the vertical direction of FIG. Since the brackets 13A and 13B supporting the press rollers 16 and 16 are always urged toward each other by the bracket connecting means (not shown) described above, Two sheets 29, 29, which are formed of a thermoplastic material and whose welding areas 29a, 29a have already been heat-welded through the hot irons 17, 17, are further pressed through the press rollers 16, 16 in the vertical direction of FIG. The two sheets 29, 29 that are pressed and sent to the rear side (direction of arrow B) of the welding device 12 are joined and integrated with each other.
Thus, in the adjoining portions of the water blocking sheets 29, 29 that are adjacent along the directions of the arrows P and Q, which are the circumferential direction of the tunnel, in both of the adjoining portions, both of them 29 via the corresponding welding devices 12. , 29 are bonded to each other as described above, and the plurality of water blocking sheets 29 bonded to each other are unreeled from each of the welding devices 12 to the rear side (arrow B direction) side. Therefore, the shield device 1
Is propelled by a predetermined distance, the plurality of water-blocking sheets 29 from the plurality of roll sheet holders 11 toward the rear side (arrow B direction) side of the roll sheet holders 11 are moved by a length corresponding to the propelling distance of the shield device 1. The water blocking sheets 2 are fed all at once, and from the rear side (the direction of arrow B) of the plurality of welding devices 12 by a length corresponding to the propulsive movement amount of the shield device 1.
The waterproof membrane structure 290, which is a bonded body of the waterproof sheet 29, is fed out in a form in which the bonded body of 9 is formed into a cylindrical membrane shape.

As shown in FIG. 2, the water-stop film structure 290 that is fed out to the rear side (the direction of arrow B) of the welding device 12 in the sheet insertion space 21 of the outer shell 2 is in the direction of arrow B from the direction of arrow A as shown in FIG. It is sent to the rear of the space 21 (in the direction of arrow B) while passing toward. Then, the seat insertion space 21 has a shape that penetrates the inside and outside of the outer shell 2 of the shield device 1 in a direction substantially along the directions A and B, which are the shield propelling directions, at the connection portion between the skin plate 2A and the tail skin 2B. Therefore, the waterproof membrane structure 290 is
The sheet insertion space 21 is continuously fed to the outside (the upper side in FIG. 2) of the tail skin 2B from the opening on the arrow B direction side which is the rear end. By the way, at this time, in the sheet insertion space 21, the plate 22b attached to the outer periphery (upper surface in FIG. 2) of the rear end portion of the skin plate 2A has a rear end portion formed in a spring shape so that the rear end surface of the skin plate 2A. Since the plate 22c is constantly pressed so that it projects further rearward (to the right in FIG. 2),
The plates 22b and 22c sandwich the water blocking sheet 29 so as to seal the opening portion of the sheet insertion space 21. Therefore, the shield device 1 is opened from the opening portion of the space 21 shown at the arrow B in FIG. Water leakage into the outer shell 2 is effectively prevented. Further, the seat insertion space 21 is provided with the sealing mechanism 20.
As a result, a more densely sealed state can be maintained. That is, during the shield propulsion work, as shown in FIG. 2, the low pressure fluid 26A and the high pressure fluid 26B are constantly supplied to the pressurizing spaces 25A and 25B of the bellows 23 by the valves 27A and 27B via the pressurizing fluid supply means (not shown), respectively. The pressure is adjusted to supply and fill from the nozzle holes 2e and 2d, respectively. Then, the bellows 23 becomes the pressurized space 2
5A and 25B are extruded through the planar member 232 in the radial direction (upward in FIG. 2) through the planar member 232 in such a manner that the volume of the pressurized fluid is expanded and filled. As a result, the water blocking film structure 290 is attached to the inner periphery of the rear end of the skin plate 2A.
It is pressed against 2a. Since the plate 22a is a thin plate such as Teflon having excellent sliding properties, the outer peripheral surface (upper surface in FIG. 2) of the water blocking film structure 290 is in close contact with the plate 22a to seal between the two 290 and 22a. On the other hand, on the inner peripheral surface (lower surface in FIG. 2) of the waterproof membrane structure 290, a plurality of ridges 231 arranged in the directions of arrows A and B of the bellows 23 are provided at their outer ends (upper ends in FIG. 2), the pores 231 and the grouting material 33 in the ground 39 and the like are shielded through the gaps 290 and 23 in such a manner that the ridge 231 serves as a shield wall. Infiltration into the inside of 1 is reliably prevented. It should be noted that the spacing of the sheet insertion space 21, that is, the vertical width in FIG. 2 is substantially unchanged during the shield propulsion work without being affected by the deformation of the segment 30 and the curve construction, and therefore the sealing of the space 21 is relatively easy. Yes, and therefore the waterproof membrane structure 290 is attached to the rear part of the shield device 1,
That is, the inner circumference of the tail skin 2B and the outer circumference 3 of the segment 30
It is possible to obtain a higher water leakage prevention effect than the case where it is fed to the outer periphery 30a of the segment 30 through the gap between the segment 0a and 0a. Further, in the seal mechanism 20, the low pressure fluid 26A is supplied to the pressurizing space 25A via the valves 27A and 27B, and the high pressure fluid 26B is supplied to the pressurizing space 25B by adjusting the pressure to an appropriate level, so that the seat The thickness of the insertion space 21 in the vertical direction in FIG. 2 can be kept substantially constant, and the brackets 13A and 13B of the welding device 12 supported by the rear end of the skin plate 2A and the front end of the tail skin can be connected to each other. It is possible to maintain an optimum sealed state at all times without burdening the user. When the waterproof membrane structure 290 passes through the sheet insertion space 21 from the arrow A direction side to the B direction side, the waterproof membrane structure 290, as shown in FIG.
Between the bellows 23 and the plates 22a and between the plates 22b,
The plates 22c are sequentially rubbed through. Then,
These plates 22a, 22b, 22c are thin plates such as Teflon which are excellent in wear resistance and slidability, and the multiple ridges 231 provided on the outer surface side of the bellows 23, that is, the plate 22b side, are different from each other. These members 22a are arranged in the left-right direction of FIG. 2 which is the front-rear direction with the outer tip (upper end of FIG. 2) portion facing rearward (rearward of FIG. 2).
22b, 22c, and 231 do not hinder the passing action of the waterproof membrane structure 290 from the arrow A direction side toward the B direction. Therefore, the waterproof membrane structure 290 smoothly passes through the seat insertion space 21 in which the sealed state is kept dense as described above, and is promptly fed to the outer side (upper side in FIG. 2) of the tail skin 2B.

The water blocking film structure 290 that has been extended to the outer side (upper side in FIG. 2) of the tail skin 2B in this way is relatively rearward with respect to the outer shell 2 by the propulsion operation of the shield device 1 in the direction of arrow A ( It moves to the direction of arrow B) and is extended further rearward of the tail skin 2B (direction of arrow B). On the other hand, inside the tailskin 2B, when the shield device 1 propels the width L1 of one ring of the segment 30 in the direction of the arrow A as described above, a segment 30 of one ring is newly added via the erector 9. Assembling this by adding it to the already constructed segment 30,
Since the segments 30 are successively extended and constructed, the water blocking film structure 290 sent to the rear of the tail skin 2B (direction of arrow B) is stretched and arranged on the tail void 35 so as to cover the outer periphery 30a of the segment 30. Therefore, as shown in FIG. 1, the tail skin 2B and the segment 30 are connected to the rear end (the end on the arrow B side) of the tail skin 2B, which constitutes the rear end of the shield device 1, as shown in FIG.
2B and 30 on the outer side in the radial direction (on the side of arrow F)
Since the water blocking film structure 290 is arranged so as to cover the shield, the shield device 1 does not need to be provided with a tail seal device on the inner circumference of the tail skin 2B, which is the rear end of the shield device 1, in the direction of arrow B. There is no concern that water will leak from the connection between the device 1 and the segment 30.

By the way, in the tail void 35, the shield device 1 is propelled a predetermined distance in the direction of the arrow A, and each time the segment 30 is constructed and extended by a predetermined distance (that is, substantially continuous without delay in a predetermined work cycle). ), For example, cement-based grout material 33 is pressure-fed and injected via a grout pump (not shown) connected to the injection nozzle 32. Then, as shown in FIG. 2, the injection nozzle 32 has the discharge port 32 a rearward, that is, with the shape toward the tail void 35, and the water blocking film structure 290 is delivered.
Since the outer shell 2 is arranged further forward (in the direction of arrow A), the grout 33 discharged from the discharge port 32a is moved after the outer shell 2 moves in the direction of arrow A by the propulsion operation of the shield device 1.
Will be backfilled between the water blocking film structure 290 and the pit wall 40b. Since the solidification start time of the grout material 33 can be freely adjusted and set in a known manner, for example, as shown in FIG. 2, the grout material discharged from the discharge port 32a at the position of the arrow R in FIG. 33
Is appropriately mixed so that the rear end (the end in the direction of arrow B) of the outer shell 2 moves forward (the direction of arrow A) from the position of the arrow R by the propulsion of the shield device 1, and then the solidification starts. Can be set in advance. Then, the grout material 33 immediately after being injected, which is interposed around the outer shell 2 of the shield device 1, has not yet started its solidification, and the grout material 33 in the unsolidified and fluidized state has a tail skin. Two
After B has passed in the direction of arrow A, the waterproof membrane structure 290 is provided on the outer periphery 30a of the segment 30 in the relative rear side with respect to the tail skin 2B (direction of arrow B) as shown in the right part of FIG.
The tail void 35 is compactly and densely packed in a shape of being pressed against. As a result, the backfilling is completed, and the segment 30 which is the lining member of the tunnel 50 is fixedly supported by the ground 39, and at the same time, as shown in FIG. Is arranged along the directions of the arrows P and Q, which are the circumferential direction of the tunnel, and the waterproof membrane structure 290 is integrally formed so as to be joined and integrated so as to cover the entire outer periphery 30a of the segment 30 in the form of a cylindrical membrane. To be done. And
The waterproof membrane structure 290 has the proximal end side of the waterproof sheet 29 temporarily fixed to the wellhead 40c. Therefore, the waterproof sheet 29 of the wellhead 40c portion is indicated by arrows P and Q in the same manner as shown in FIG. The welding regions 29a, 29a of the sheets 29, 29 that are adjacent to each other along the tunnel circumferential direction are welded to each other by appropriately joining the welding regions 29a, 29a to each other. If the end portion is processed and formed, the water blocking film structure 290 that is watertightly connected from within the shield device 1
All tunnels 40 from the pit 40c to the face 40a are ground 3
No water leakage is prevented. Therefore, since the tunnel 50 constructed in this way has an extremely watertight tunnel structure, it is not necessary to treat the wastewater by causing water leakage inside the tunnel 50, and the maintenance cost after the tunnel is in service is greatly reduced.

Thus, the shield device 1 is parallel to the excavation by the cutter disk 3 and the propulsion operation of the outer shell 2 by the shield propulsion jack 7 and the assembling and assembling work of the segment 30 following the shield device 1. At the same time as the uniform propulsion work, the tunnel 50 can be simply and efficiently water-stopped substantially automatically and continuously without requiring any labor and work by simply relying on the propulsion operation of the outer shell 2. .. Therefore, since the lining member such as the segment piece 31 does not need to be subjected to any processing such as the grout injection hole and the groove or hole for disposing the water blocking member, the member cost of the segment piece 31 is reduced. In addition to being reduced, the labor and cost of laying or injecting a sealing member for waterproofing after construction of the segment is completely eliminated, and yet the entire outer circumference 30a of the segment 30 is covered with a tunnel. All 30 areas are leak protected. In addition, the water blocking film structure 290 thus arranged so as to cover the entire outer periphery 30a of the segment 30 is adhered to the ground 39 side via the grout material 33, and is in a non-adhesive state with the segment 30. From a certain point, when designing the segment 30, it is not necessary to consider the connection point with the waterproof membrane structure 290, that is, the cross-sectional defect for mounting the segment 30, and the segment 30 is optimal as a lining structural member of the tunnel 50. It can be freely designed to have any shape. In addition, since the waterproof membrane structure 290 is in a non-adhesive state with the segment 30, the internal stress of the ground 39 is locally applied to the segment 30 in such a manner that the segment 30 is cut off from the ground 39 (isolation). At the same time, the reinforcing material 291 is disposed in the reinforced area 29b of each of the water blocking sheets 29 constituting the water blocking film structure 290, and the reinforced area 29b of the segment 30 is provided. The stress of the ground 39 causes the reinforcing material 2 to cover the substantially entire circumference.
The load is also dispersed by 91, so that the strength of the tunnel 50 is increased and the safety factor of the structure is increased.

In the above-described embodiment, the water blocking sheet 29 forming the water blocking film structure 290 has the welded areas 29a, 29 at both edges of the belt-shaped sheet member.
Although the example in which a is provided and the reinforcing material 291 is provided in the reinforcing region 29b other than the welding region 29a has been described, the water blocking sheet 29 used in the present invention is joined and integrated with each other by welding or the like. If possible, it may have other forms. Further, according to the present invention, at the same time as the propulsion operation of the shield device 1, a plurality of water blocking sheets 29 are joined together adjacent to each other in the tunnel inner circumferential direction (arrow P, Q direction) of the sheets 29, and the axis of the tunnel 50 is joined. It is important to pay out in the direction (arrows A and B) and arrange this so as to cover the entire outer circumference 30a of the segment 30 which is the lining of the tunnel 50. Water sheet 2
In order to bond 9 and 29 to each other, a method of superposing these 29 and 29 through the guide rollers 15 and 15 of the welding device 12 and welding with the hot iron 17 and 17 has been described. The sheets 29 may be joined together in such a manner that the sheets 29 face each other, and the joining method may be joined by hot air welding, high frequency welding, hot melt adhesive or other means. .. Further, the sheet insertion space 21 may be sealed by means other than the sealing mechanism 20, and the details of the excavation means such as the cutter disk 3 and the propulsion means such as the shield propulsion jack 7 and other shield devices 1 have been described above. The present invention is not limited to the embodiment, and may be freely changed according to the design mode of the tunnel 1 and may be changed.

[0030]

As described above, according to the present invention,
Inside the shell body such as the outer shell 2 which can be propelled in the ground 39,
A plurality of water blocking sheets 29 each formed in a strip shape,
The shell bodies are stored in the outer periphery of the tunnel lining such as the outer periphery 30a of the segments 30 to be constructed so as to be adjacent to each other along the inner circumferential direction of the tunnel, and the shell is stored in the ground 3
9 and the tunnel lining for a distance corresponding to the amount of propulsive movement of the shell body is constructed and arranged so as to be connected to the rear side of the shell body in the propulsion direction, The water blocking sheet 29 is attached to each welding area 2 of the water blocking sheet 29.
9a or the like is joined to the edge of an adjacent water-stop sheet while being extended to the rear side with respect to the propelling direction of the shell, and the tunnel lining is provided with the water-stop film structure 290 or the like. Since the bonded body of the water sheet 29 is arranged so as to cover the outer circumference of the tunnel lining over the entire circumference,
The tunnel lining can be isolated from the ground 39 in such a manner that the joined body of the water blocking sheets covers the outer circumference of the tunnel lining over the entire circumference. Therefore, the inside of the tunnel lining such as the tunnel 40 is separated from the ground 39 by the joined body of the water blocking sheets that cover the outer circumference of the tunnel lining over the entire circumference,
Water leakage is reliably and densely prevented. Moreover, the work of covering and installing the bonded body of the waterproof sheet over the entire circumference of the tunnel lining is parallel to the shell propulsion work and the tunnel lining construction work, and requires a short period of time and construction efficiency. You can do this without slowing down. Furthermore, since the joined body of the water blocking sheets covers the outer circumference of the tunnel lining over the entire circumference, a separate sealing is applied to the lining pieces such as the segment pieces 31 constituting the tunnel lining. There is no need to lay or fill the material, and the work time for that is saved, and the mold for molding the lining piece is provided with irregularities for grooves for arranging the sealing material. Since it does not need to be placed, the unit price of the material will be low, and the tunnel construction will be economical. Further, it has a shell body such as an outer shell 2 which leads the tunnel lining of the segment 30 and the like, and excavation propulsion means such as a cutter disk 3 and a shield propulsion jack 7 are provided in the shell body, and a sheet is provided on the shell body. Insertion space 21
And the like, and sheet holding means such as the roll sheet holder 11 is provided in the shell, and the water blocking sheet 29 formed in the form of a strip is attached to the sheet feeding part. A plurality of welding devices 12 are installed along the inner circumferential surface of the shell body so as to be able to be unwound and held on the outer circumferential portion of the tunnel lining through the welding device, and the waterproof sheet 29 is joined to the shell body. When the shield device is configured to be able to join the water blocking sheets 29 fed from the adjacent sheet holding means, when the shield device is propelled through the excavation propulsion means, the amount of propulsive movement of the shield device is increased. The sheet holding means can feed out the water blocking sheet 29 of a length corresponding to, and the joining means can join the water blocking sheet 29 fed out by the water blocking sheet holding means. Then, by using the shield device according to the present invention, laying of the sealing material,
By simply propelling the shield device without performing any filling or complicated work related to the filling, the water blocking sheet 29 is fed out from the sheet holding means and the water blocking sheet 29 is joined, whereby the water blocking sheet is joined. It is possible to form the joined body of the above, to extend the joined body of the waterproof sheet to the outside of the tunnel lining, and to cover and install the joined body over the entire length of the outer circumference of the lining with only the minimum necessary work. You can easily. Therefore, it is extremely efficient to give a reliable waterproofing work to the tunnel lining, and the construction of the waterproofing work is performed at the same time as the tunnel excavation promotion and lining construction work. To do. Further, when the backing material injecting means such as the injecting nozzle 32 is provided in the shell body so as to be arranged in front of the sheet feeding portion in the excavation direction, the backing material injecting means includes the backing material such as the grout material 33. When the backing material is supplied, the backing material supplied can be injected between the water blocking sheet 29 and the ground 39 which are fed from the sheet feeding portion. Then, the shell body, by the propulsion operation of the shield device,
Since it moves forward in the propulsion direction with respect to the backfill material injected by the backfill material injecting means, the waterproof sheet holding means is extended to the rear side in the excavating direction of the shell body during shield propulsion as described above. A water-blocking sheet joined body in which the water-stopping sheet 29 is joined by a joining means is fed out, and a backing material is injected in such a manner that the water-stopping sheet joined body is pressed against the outer periphery of the tunnel lining to stop the water-stopping sheet. It can be backfilled and filled between the joined body of the water sheets and the ground 39 without any trouble. As a result, the joined body of the waterproof sheets does not become loose between the tunnel lining and the ground 39, and the joined body of the waterproof sheet is evenly distributed over the entire length of the outer circumference of the tunnel lining. At the same time as being spread, the backing material is completely prevented from leaking from the connection between the shield device 1 and the tunnel lining to the tunnel lining side. Furthermore, since it is not necessary to form an injection hole for injecting the backfill material through the joined body of the tunnel lining and the water blocking sheet, a structural defect portion is formed in the tunnel lining and the water blocking sheet 29. Can be avoided, and the reliability of the strength and the water stopping property can be enhanced.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a shield device used in a tunnel water stopping method according to the present invention.

FIG. 2 is an enlarged view showing an example of a tail seal portion in the shield device shown in FIG.

FIG. 3 is a view taken in the direction of arrows III and III in FIG.

FIG. 4 is a view taken along arrows IV and IV in FIG.

5 is a view on arrow V in FIG. 2. FIG.

FIG. 6 is a view taken in the direction of arrows VI and VI in FIG.

FIG. 7 is a view showing an example of a water blocking sheet used in the tunnel water blocking method according to the present invention.

FIG. 8 is a diagram showing an example of a water blocking structure of a conventional shield tunnel.

9 is a diagram showing an example of a segment used in the water blocking structure shown in FIG.

[Explanation of appendix]

 1 ... Shield device 2 ... Shell (outer shell) 3 ... Excavation propulsion means (cutter disk) 7 ... Excavation propulsion means (shield propulsion jack) 11 ... Sheet holding means (roll sheet holder) 12 ... Joining means (welding device) 21 …… Sheet feeding part (sheet insertion space) 29 …… Water blocking sheet 290 …… Joint body of water blocking sheet (water blocking film structure) 29a …… Edge of water blocking sheet (welding area) ) 30 ... tunnel lining (segment) 30a ... outer circumference of tunnel lining 32 ... backing material injection means (injection nozzle) 33 ... backing material (grout material) 39 ... ground

Claims (3)

[Claims] 1. A tunnel to be constructed in such a manner that a plurality of water blocking sheets each formed in a strip shape are provided inside a shell body that can be propelled in the ground and are adjacent to each other along the inner circumferential direction of the tunnel. It is stored in the outer periphery of the lining so that it can be freely extended, the shell is propelled into the ground, and the tunnel lining for a distance corresponding to the amount of propulsive movement of the shell is moved in the propelling direction of the shell. While being constructed and arranged so as to be connected to the rear side with respect to each other, the plurality of water blocking sheets, while mutually joining the edges of the respective water blocking sheets with the edges of the adjacent water blocking sheets,
It is extended to the rear side with respect to the propelling direction of the shell body, and the joint body of the waterproof sheet is installed in the tunnel lining in such a manner that the outer periphery of the tunnel lining is covered over the entire circumference. The method of stopping the water in the tunnel. 2. A shell body having a shape that leads a tunnel lining, an excavation propulsion means is provided in the shell body, and a sheet feeding portion is provided in the shell body so as to penetrate the inside and outside of the shell body. An inner peripheral surface of the shell body in a form capable of holding a sheet holding means in the shell body and a strip-shaped water blocking sheet so as to be able to be drawn out to the outer peripheral portion of the tunnel lining through the sheet payout portion. A plurality of along with, the joining means for joining the water blocking sheet in the shell,
A shield device, wherein the water blocking sheets fed from the adjacent sheet holding means are provided so as to be joined together. 3. The shield device according to claim 2, wherein a backfill material injection means is provided in the shell body so as to be arranged in front of the sheet feeding portion in the excavation direction.