JP3340097B2 - Water stop device for seal on the outer periphery of segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water blocking device for sealing an outer peripheral side of a segment, and more particularly to a sealing body formed by injecting pressurized water into an elastic membrane having an annular bag provided near the outer periphery of a segment and expanding the elastic membrane. To a water stop device configured to be pressed against a body member.

[0002]

2. Description of the Related Art When excavating various shield tunnels (tunnels) for water and sewage and communication cables by using a shield excavator, a branch tunnel with a small diameter is often branched and excavated from the middle of the tunnel. In the case of branch excavation, usually, the main tunnel is excavated with the main line shield excavator, and when arriving at the branch point, the branch line shield excavator is branched rightward or leftward from the main line shield excavator. After the start, the main tunnel is excavated independently with the main line shield excavator using the main line shield excavator.

When a branch line shield excavator starts a branch, a special segment forming a branch start port is assembled, and then a start port ring is mounted so as to be connected to the branch start port. Connect with bolts and welds. At the start of the branch, water and earth and sand from the ground will enter the inside of the excavator body from the branch start port, and the filling material filled in the launch port ring to prevent the collapse of the ground will be filled inside the excavator body. In order to prevent intrusion into the water, a segment having a water stop device is sequentially assembled in a circumferential direction between the special segment and the shield jack (Japanese Patent Application Laid-Open No. Hei 1 (1994)).
0-231696).

Japanese Patent Application Laid-Open No. Hei 10-231696 discloses a start-side ring attached to a start-port side of a tunnel, a face-side ring attached to a face-side of a tunnel, and a space between the start-side ring and the face-side ring. A waterproofing device for a seal on the outer peripheral side of a segment having a waterproofing seal attached thereto is described. When this water stop seal is assembled into a toroidal body and expanded in diameter, it can abut against a trunk member which is fitted around the outer periphery of the segment loosely. The face side ring includes an enlarged diameter portion including an enlarged diameter bar and an enlarged diameter bolt. The diameter expansion bar is provided separately on the inner peripheral portion of the water stop seal, and it is possible to expand the water stop seal by pushing the water expansion seal to expand the diameter. It is possible.

On the other hand, JP-A-11-6389 discloses that
At the seal case attached to the opening of the shaft, both ends of the seal material having a substantially U-shaped cross section are attached to form a hollow membrane portion projecting to the inner peripheral side of the opening, and at the seal material entry side of the seal material. There is described a water stop device in which an annular seal body which is larger than a hollow membrane part and protrudes toward the center of a shaft is overlapped and mounted in parallel.

[0006]

[Problems to be Solved by the Invention]
In the water stopping device disclosed in Japanese Patent Application Publication No. 696, since the pressure contact force between the enlarged diameter bars adjacent in the circumferential direction is weak, the pressing force over the entire circumference is not uniform, and it is not possible to secure high water stopping performance. Since multiple expansion bolts must be manually tightened, in order to make the pressing force of the entire circumference as uniform as possible, deploy a large number of expansion bolts in the circumferential direction and use a torque wrench for all the expansion bolts. It is necessary to tighten with a predetermined tightening torque, which not only takes a long working time, but also increases the number of parts, etc., due to the increase in the number of expanding bolts and the like, so that the manufacturing cost increases.
Moreover, this is not a configuration in which the body member, the tubular member, and the like can be relatively moved back and forth in a state in which the body member, the tubular member, and the like abut against the water-stop seal.

In the water stopping device disclosed in Japanese Patent Application Laid-Open No. H11-6389, when the hollow membrane portion and the annular seal body are mounted, the surrounding ground must be improved with mortar or the like.
Costs are required. A pressurized water injection pipe or the like of a pressurized water injection mechanism must be provided inside the shaft wall of the shaft, and drilling work and the like for that purpose are required. An object of the present invention is to ensure a high water-blocking property, to simplify the mounting structure, to enable easy mounting, and the like.

[0008]

According to a first aspect of the present invention, there is provided a water stopping device for sealing an outer peripheral side of a segment, wherein the water stopping device is capable of sealing between a segment and a body member which is loosely fitted around the outer periphery of the segment. An elastic film body having an annular bag portion provided in the vicinity of the outer periphery of the segment; an annular seal body having flexibility to cover at least an outer peripheral surface side of the annular bag portion of the elastic film body; an injection die for injecting pressurized water into the annular bag part of the body, the elastic film body and the boundary of the two sets of <br/> segments adjacent to each other to accommodate to and fixed to the inner peripheral portion of the annular seal member And an annular recess recessed in the portion.

A description will be given as an example of a preparatory stage in which a branch line shield excavator is branched and started from a branch point in the middle of a main line tunnel. The shield machine for tunnel excavation on the main line is provided in advance with, for example, an inner trunk which is slidably fitted in the outer trunk relative to the outer trunk in the axial direction of the tunnel. The excavator body and outer shell of the shield excavator are moved forward relative to the inner shell to construct segments for a plurality of rings on the inner surface of the inner shell.

Next, when the branch point is reached during the excavation of the main line tunnel, a portion other than the inner trunk of the shield excavator is moved forward with respect to the inner trunk while excavating the main line tunnel. A special segment forming a branch start port is assembled near the inner surface and between the reinforced segment and the shield jack. After that, a launch port ring is assembled so as to be connected to the branch launch port and connected to the special segment.
Next, the front end portion of the branch line shield machine is partially inserted and set in the launch port ring.

[0011] Next, at the time of branch start, the filler material filled in the start port ring to prevent water or earth and sand from the ground from entering the inside of the excavator body from the branch start port, and to prevent collapse of the ground. In order to prevent the intrusion into the inside of the machine,
Assemble the water stop device that seals the outer peripheral side of the segment according to the following procedure. That is, the entire shield excavator is moved forward while excavating the main line tunnel, and the inner peripheral portion of the annular seal body and the elastic membrane body is provided at the front end of the reinforced special segment and between the special segment and the shield jack. It is fixed sequentially in the circumferential direction.

Next, a segment is constructed for one ring, and the annular seal body and the inner peripheral portion of the elastic membrane are accommodated in an annular recess formed at the boundary between the segment and the special segment. Equipped to protrude to the inner circumference of the segment. Thereafter, pressurized water is injected into the elastic membrane from the injection mouth to elastically deform the annular bag portion into a swollen state, and a liquid-tight seal is formed between the elastic membrane and the inner body with an annular seal.

In particular, since the annular bag portion is elastically deformed and the space between the annular bag portion and the inner body is sealed in a liquid-tight manner with an annular seal body, the pressing force over the entire circumference of the annular seal body is uniform, and high water stopping performance is ensured. Thus, it is possible to prevent water or earth and sand from entering the inside of the excavator body from the filler or the branch start port filled in the start port ring. Since the annular seal body covers at least the outer peripheral surface side of the annular bag portion of the elastic membrane body, the elastic membrane body is protected by the annular seal body, and a body member, a cylindrical member, and the like abut against the annular seal body from outside. It can be relatively moved back and forth in the state of being made. Since the entire circumference between the inner barrel and the inner body can be sealed only by injecting pressurized water from one injection port, it is not necessary to tighten a large number of enlarged bolts with a predetermined tightening torque, and the number of parts can be reduced.

According to a second aspect of the present invention, there is provided a water blocking device for sealing a segment outer peripheral side according to the first aspect of the present invention, wherein the body member slides from an annular recess at a corner formed in the elastic film and the annular seal. A corner portion bent in the direction. Since a corner portion bent from the annular concave portion in the sliding direction of the body member is formed in the elastic film body and the annular seal body, sealing is performed at the corner portion.

According to a third aspect of the present invention, there is provided a water blocking device for sealing a segment outer peripheral side according to the first or second aspect of the present invention, wherein a pressurized water injection mechanism for injecting pressurized water into the elastic film body and an air inside the elastic film body are released. And an air vent nozzle. Therefore, when the pressurized water injection mechanism elastically deforms the annular bag portion into an expanded state, the air in the elastic film body is forcibly discharged to the outside from the air vent nozzle.

According to a fourth aspect of the present invention, there is provided a water blocking device for sealing the outer peripheral side of the segment according to the first aspect of the present invention, wherein the inlet and the air vent nozzle are provided so as to protrude toward the inner peripheral side of the segment. Things. The intended performance is achieved by providing an injection nozzle for injecting pressurized water near the vertical lower part, for example, so that the pressurized water does not leak from this injection nozzle, and an air vent nozzle near the vertical upper part (top part). can do. In particular, since the injection port and the air vent nozzle are provided so as to protrude toward the inner peripheral side of the segment, the pressurized water injection pipe and the like can be efficiently and easily attached without being disturbed by earth and sand.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, in the preparation stage of branching and starting the branch line shield excavator from the branch point in the middle of the main line tunnel, it is possible to seal between the segment and the trunk member loosely fitted around the outer periphery of this segment. It is an example when the present invention is applied to a water stop device.
Note that the front, rear, left and right in the direction of excavation of the shield machine are referred to as front, rear, left and right.

As shown in FIG. 1 to FIG.
An elastic film body 2 and an annular seal body 3 having an annular bag portion 2a provided in the vicinity of the outer periphery of the segment Sb; an injection mouthpiece 4 for injecting pressurized water into the elastic film body 2;
A pressurized water injection mechanism 5 for injecting pressurized water into the air, an air bleeding nozzle 6 for bleeding air from the elastic film body 2, and an annular concave portion 7 recessed at the boundary between adjacent segments Sa and Sb. Have.

First, the segment Sa will be described. As shown in FIGS. 1 and 2, the segment Sa is a special segment made of, for example, steel (which may be made of concrete other than steel, for example) forming the branch start port 31 of the branch line shield machine 30. A start port ring 32 made of steel is connected to the segment Sa by bolts or welding so as to be continuous with the branch start port 31.
In addition, an annular entrance packing 33 is previously mounted on the inner surface of the starting port ring 32.

Next, the segment Sb will be described.
As shown in FIG. 2 to FIG. 4, the segment Sb is a steel segment, and is sequentially arranged rearward from the face side.
The large diameter part 8, the medium diameter part 9, and the small diameter part 10 are welded and joined. The middle diameter portion 9 is equipped near the vertical lower portion so that the injection port 4 protrudes toward the inner peripheral side of the segment Sb and does not leak pressurized water from the injection port 4. It is equipped near the vertical upper part (top) so as to protrude inward. Reference numeral 11 indicates a seal.

The small-diameter portion 10 and the small-diameter portion 10
An annular recess 7 is formed by the ring wall portion 12 and one end of the middle diameter portion 9 for welding and joining to the segment Sa adjacent to the small diameter portion 10, and the elastic film body 2 and the annular seal body are formed in the annular recess 7. 3 is housed and fixed with bolts 13. That is, for example, a rubber spacer ring 14 is provided on the seat surface of the bolt head. The bolt head and the spacer ring 14 are housed in the annular recess 7 and are held between the elastic film 2 and the segment Sa. And the inner peripheral portion of the annular seal body 3 is clamped and fixed by the nut 15.

Next, the pressurized water injection mechanism 5 will be described. The pressurized water injection mechanism 5 includes a pressurized water supply source (consisting of a tank, a pump, a motor, various valves, etc.) and a pressurized water injection pipe 16 and the like. The water is injected from the supply source through the pressurized water injection pipe 16 into the elastic membrane 2 through the injection mouthpiece 4. With the injection of the pressurized water, the air in the elastic film body 2 is discharged from the air vent nozzle 6 to the outside. The elastic membrane 2
Is fixed to the outer peripheral surface of the middle diameter portion 9 by the injection die 4 and the flange portion of the air vent nozzle 6.

The annular seal member 3 has flexibility and covers the inner peripheral side to the outer peripheral side of the elastic film body 2. Corner portions 2b and 3a are formed in the elastic film body 2 and the annular seal body 3 so as to bend from the annular concave portion 7 in the sliding direction of the outer shell 17 or the inner shell 19 (corresponding to the respective torso members). Sealing is performed at the corners 2b and 3a. Sign 1
Reference numeral 8 denotes a joining bolt.

The operation of the water stopping device 1 described above will be described. However, a description will be given as an example of a preparatory stage in which the branch line shield excavator 30 branches and starts from a branch point in the middle of the main line tunnel. As shown in FIGS. 1A and 2, when a branch point is reached during excavation of the main tunnel, parts other than the inner trunk 19 of the shield excavator are moved to the inner trunk 19 while excavating the main tunnel. Segment S forming a branch start port 31 near the inner surface of the inner trunk 19 and between the reinforced segment S and the shield jack 20.
Assemble a. After that, the starting port ring 32 is assembled so as to be connected to the branch starting port 31 and is connected to the segment Sa. Next, the front end portion of the branch line shield machine 30 is partially inserted and set in the launch port ring 32.

Next, at the time of branch start, water and earth and sand from the ground are introduced into the body of the excavator from the branch start port 31 and the start ring 32 is filled to prevent collapse of the ground. In order to prevent the filler from entering the inside of the excavator body, the water stop device 1 for sealing the outer peripheral side of the segment is generally assembled in the following procedure. That is, the entire shield excavator is moved forward while excavating in the main tunnel, and the inner peripheral portions of the annular seal member 3 and the elastic film member 2 are bolted to the front end of the segment Sa between the shield jack 20 and the shield jack 20 in the circumferential direction. It is fixed sequentially. At this time, the injection port 4 and the air vent nozzle 6 are attached to the elastic film body 2 in advance.

Next, the segment Sb is constructed for one ring, and the annular seal member 3 and the inner peripheral portion of the elastic membrane member 2 are accommodated in the annular concave portion 7 recessed between the segment Sb and the segment Sa. Base 4 and air vent nozzle 6
Is provided so as to protrude toward the inner peripheral side of the segment Sb.
Next, a pressurized water injection pipe 16 is attached to the injection port 4, and then pressurized water is injected into the elastic film body 2 by the pressurized water injection mechanism 5 to elastically deform the annular bag portion 2 a into an expanded state. Is sealed liquid-tight. Almost in parallel with this,
The entrance packing 33 of the starting port ring 32 is inflated to a sealed state, and the starting port ring 32 is filled with a filler such as high-concentration muddy water for preventing collapse of the ground. Thereafter, as shown in FIG. 1B, the outer shell 17 and the inner shell 19 are fixed in a state where the outer shell 17 is relatively moved forward with respect to the inner shell 19, and the entire shield excavator is branched and emitted. The branch start port 31 is made to advance from the entrance 31 so that the branch start port 31 faces the ground. In this state, the branch line shield excavator 30 is branched and started from the branch start port 31.

Since the annular bag portion 2a is elastically deformed to seal the space between the annular body 3 and the inner body 19 in a liquid-tight manner, the pressing force over the entire circumference of the annular seal body 3 is uniform, and high waterproofness can be ensured. It is possible to prevent water, earth and sand from the starting port 31 or the filler filled in the starting port ring 32 from entering the inside of the excavator body.

According to the segment outer-seal-side sealing water stop device 1 described above, since the annular seal body 3 covers at least the outer peripheral surface side of the annular bag portion 2a of the elastic membrane body 2, the elastic membrane body 2 is annularly sealed. It is protected by the seal body 3 and can be relatively moved back and forth in a state where the outer shell 17 and the inner shell 19 are in contact with the annular seal body 3 from the outside. Since only the pressurized water is injected from one injection port 4 to seal the entire circumference with the inner body 19, it is not necessary to tighten a large number of enlarged bolts with a predetermined tightening torque, and the number of parts can be reduced. it can. Outer body 17 or inner body 1 from annular recess 7
Since the corner portions 2b and 3a bent in the sliding direction 9 are formed in the elastic film body 2 and the annular seal body 3, most of the surface area of the annular seal body 3 from the corners 2b and 3a. In this case, the sealing performance is not deteriorated even if the inner trunk 19 and the outer trunk 17 are moved in the front-rear direction relative to the segment Sb.

Since the water stopping device 1 includes the pressurized water injection mechanism 5 and the air vent nozzle 6, the pressurized water injection mechanism 5
Accordingly, when the annular bag portion 2a is elastically deformed to an expanded state, the air in the elastic film body 2 is forcibly discharged from the air vent nozzle 6 to the outside by the pressure of the pressurized water. Since the inlet port 4 and the air vent nozzle 6 are provided so as to protrude toward the inner peripheral side of the segment Sb, the pressurized water injection pipe 16 and the like can be efficiently and easily mounted in the segment Sb without bothering with earth and sand. be able to.

Next, a modified embodiment in which this embodiment is partially modified will be described. 1) It is also possible to inject pressurized water into the elastic film body 2 by the pressurized water injection mechanism 5 to elastically deform the annular bag portion 2a into an expanded state, and to seal the space between the outer bag 17 and the shield excavator in a liquid-tight manner. is there. 2) The positions of the inlet 4 and the air vent nozzle 6 in the circumferential direction are not particularly limited. 3) The water stoppage device of the present invention can be applied to a stage other than the preparation stage for branching and starting the branch line shield machine. 4) The segment Sb may be made of a material other than steel.
In addition, without departing from the spirit of the present invention, it is possible to implement the above-described embodiment with various modifications.

[0031]

According to the first aspect of the present invention, pressurized water is injected into the annular bag portion of the elastic membrane to inflate the annular bag portion and seal the space between the elastic film body and the body member in a liquid-tight manner. The circumferential pressing force is uniform, and high water-stopping properties can be secured.
For example, when a branch line shield excavator starts branching, water and earth and sand enter the inside of the excavator body from the branch start port, and the filler filled in the start port ring to prevent collapse of the ground is excavated. It is possible to reliably prevent intrusion into the inside of the machine body. In particular, since the annular seal body covers at least the outer peripheral surface side of the annular bag portion of the elastic membrane body, the elastic membrane body is protected by the annular seal body, and the body member, the cylindrical member, and the like are protected from the outside with respect to the annular seal body. It can be relatively moved back and forth in the abutted state. Since only the pressurized water is injected from one injection port, the entire circumference between the body member can be sealed,
There is no need to tighten a large number of enlarged bolts with a predetermined tightening torque, and the number of parts can be reduced. Therefore, manufacturing costs can be reduced.

According to the second aspect of the present invention, the corners bent from the annular recess in the sliding direction of the body member are formed in the elastic film body and the annular seal body. Sealing is performed over most of the surface area of the body, and even if the trunk member is moved in the front-rear direction relative to the segment, the sealing performance is not deteriorated. Other claim 1
It has the same effect as.

According to the third aspect of the present invention, since the water stopping device is provided with the pressurized water injection mechanism and the air vent nozzle, when the pressurized water injection mechanism elastically deforms the annular bag portion into an expanded state, The air in the elastic membrane is forcibly discharged to the outside from the air vent nozzle by the pressure of the pressurized water. Therefore, the seal between the segment and the body member on the outer peripheral side of the segment can be quickly sealed, and the working time can be significantly reduced. The other effects are the same as those of the first or second aspect.

According to the fourth aspect of the present invention, since the injection mouthpiece and the air vent nozzle are provided so as to protrude toward the inner peripheral side of the segment, the pressurized water injection pipe and the like are not bothered by earth and sand in the segment. It can be installed efficiently and easily. The other effects are the same as those of the first or second aspect.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a middle stage of branching and starting a branch line shield excavator from a branch point in the middle of a main line tunnel;
(A) is a figure which shows the shield machine and the branch line shield machine before start, (b) is a figure which shows the state immediately after the start of the branch line shield machine.

FIG. 2 is a cross-sectional plan view of main parts of the shield excavator and the branch line shield excavator showing a preparation stage for starting the branch line shield excavator.

FIG. 3 is an enlarged sectional view of a main part of the water blocking device for a seal on the outer peripheral side of the segment in FIG. 2;

FIG. 4 is a front view of a segment showing a circumferential arrangement position of an injection die and an air vent nozzle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water-stop device 2 Elastic membrane 2a Annular bag part 2b Corner part 3 Annular seal body 3a Corner part 4 Injection metal 5 Pressurized water injection mechanism 6 Air vent nozzle 7 Annular recess 17 Outer trunk 19 Inner trunk Sb segment

──────────────────────────────────────────────────続 き Continuing on the front page (72) Mitsuo Shimizu 1-3-1 Higashikawasakicho, Chuo-ku, Kobe Kawasaki Heavy Industries, Ltd. Kobe Head Office (72) Keiji Suno 9-1, Wakamatsucho, Nagata-ku, Kobe-shi No. 30 Rokuryo Rubber Co., Ltd. (72) Inventor Seiji Sekitani 9-1-30 Wakamatsucho, Nagata-ku, Kobe City Inside Rokuhishi Rubber Co., Ltd. (72) Koji Tada 1-chome, Kyobashi 7-chome, Chuo-ku, Tokyo No. 1 Inside Toda Construction Co., Ltd. (72) Yasuhiko Asai, Inventor 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Takehisa Yoshizawa 1-1-1, Kyobashi, Chuo-ku, Tokyo Toda Construction (72) Inventor Seiichi Matsushita 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Yoshio Iwai 1-chome, Kyobashi, Chuo-ku, Tokyo No. 1 Toda Construction Co., Ltd. (72) Inventor Osamu Kobayashi 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Akira Hori 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda (56) References JP-A-10-231696 (JP, A) JP-A-11-6389 (JP, A) JP-A-9-256794 (JP, A) JP-A-5-22697 (JP, A) , U) Jikho 56-6550 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 11/38 E21D 9/06 301

Claims (4)

(57) [Claims] 1. A water stop device capable of sealing between a segment and a body member which is loosely fitted on the outer periphery of the segment, wherein the elastic member has an annular bag portion provided near the outer periphery of the segment. A membrane, a flexible annular seal that covers at least the outer peripheral surface of the annular bag of the elastic membrane, an injection mouthpiece for injecting pressurized water into the annular bag of the elastic membrane, An annular recess formed at a boundary between two sets of segments adjacent to each other to accommodate and fix an inner peripheral portion of the membrane body and the annular seal body. Water stop device. 2. A corner portion formed on the elastic film body and the annular seal body, wherein the corner portion is bent from the annular concave portion in a sliding direction of the trunk member. Water-stop device for sealing the outer peripheral side of the segment. 3. The elastic film body according to claim 1, further comprising a pressurized water injection mechanism for injecting pressurized water into the elastic film body, and an air bleeding nozzle for bleeding air from the elastic film body. Water-stop device for sealing the outer peripheral side of the segment. 4. The waterproofing device for sealing the outer peripheral side of a segment according to claim 1, wherein the inlet and the air vent nozzle are provided so as to protrude toward the inner peripheral side of the segment.