JPH11350509A - Cut-off structure of incremental lunching yard for rectangular body of underwater tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide cut-off structure of a rectangular body incremental lunching yard for an underwater tunnel capable of making good cut-off correspondingly to variations in the width of the rectangular body such as emergency parking strip, etc., for the underwater tunnel. SOLUTION: The cut-off structure of an incremental launching yard is used in a construction method of an underwater tunnel executed by incrementally launching a group of rectangular bodies 300 connected to each other on the bottom in sequence. In that case, a cut-off wall 200 capable of passing through the body 300 is provided in the area of the sea on the incremental launching departure side of the body 300, the incremental launching yard is provided to the shore side of the cut-off wall 200, and a cut-off gate such as movable cut-off gate 520, etc., correspondingly to variations in a normal width section 310 of the rectangular body 300 or the width of the body, always in contact with the circumferential surface of the body 300 and preventing the incursion of water into the incremental launching yard is provided to the cut-off wall 200.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water stopping structure for a box extrusion jar of a submerged tunnel.

[0002]

As a conventional extruded underwater tunnel construction method, there is Japanese Patent Publication No. 60-1478. In this method, as shown in FIG. 14, a box b manufactured in a dry state by a manufacturing yard a is sequentially extruded on a slide bearing c to reach the opposite shore of a water channel d to complete a submerged tunnel. It is a construction method.

[0003] In the conventional extruded underwater tunnel construction method described above, a box b is manufactured in the land part along the coast of the water body,
Extrusion is performed while connecting. Therefore, it is necessary to extrude the boxes over the entire width of the water area to be traversed. Therefore, the extrusion distance of the box group becomes long, which is uneconomical in terms of construction period and construction cost.

Accordingly, the applicant of the present application has established a water-blocking wall in the water area on the extrusion start side of the box, provided an extrusion yard with a water level adjustable on the shore side of the water-blocking wall, and provided this extrusion yard. In, by connecting the group of connected boxes through the water blocking wall and sequentially extruding them to the water bottom, the extrusion distance of the group of boxes is shortened, the construction method of the underwater tunnel that aims to shorten the construction period and reduce the construction cost Already provided.

By the way, the length of a road tunnel is 1000
m or more, it is necessary to provide an emergency parking zone, so that the width of the box becomes large in this area. The water stop wall comes into contact with the outer peripheral surface of the box to stop the water and prevents water from entering the extrusion jar. Therefore, there is a need for a technique for achieving good water stoppage in response to changes in the case width.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and it is possible to achieve a good water stoppage in response to a change in the width of a box such as an emergency parking zone. An object of the present invention is to provide a waterproof structure for a tunnel extrusion yard of a tunnel.

[0007]

SUMMARY OF THE INVENTION As a means for solving the above problems, the present invention provides a method for stopping an extrusion yard used in a method of constructing an underwater tunnel by sequentially pushing a group of connected boxes to the bottom of the water. In the water structure, a water stop wall through which the box can penetrate is provided in the water area on the extrusion start side of the box, and an extrusion yard provided on the shore side of the water stop wall, wherein the water stop wall has Corresponds to changes in the width of the normal or widened part of the box, and always has a waterproof gate that keeps in contact with the outer peripheral surface of the box and prevents water from entering the extrusion jar. It is characterized by comprising
Provided is a waterproof structure for a box extrusion jar of an underwater tunnel.

Further, in a water stopping structure of an extrusion yard used in a method of constructing a submerged tunnel in which a group of connected boxes are sequentially extruded to the bottom of the water, the box penetrates into the water area on the extrusion start side of the box. An extruding yard provided with a possible water stop wall, the water level being adjustable on the shore side of the water stop wall, and the inside of the water stop wall being in contact with the outer peripheral surface of the normal width portion of the box. And a removable water stop gate that can be removed when the widened part behind the normal width of the box approaches, and a slightly stop before the removable water stop gate. Immediately before removing the water gate, a fixed water stop gate that contacts the outer peripheral surface of the widened portion of the box to stop water
The fixed widening gate is provided slightly in front of the fixed watertight gate, and is accommodated in the waterstop wall while the widened part of the box is in contact with the fixed watertight gate. A movable water stop gate which projects immediately before passing through the fixed water stop gate and contacts the outer peripheral surface of the normal width portion behind the widened portion of the box to stop water. The present invention provides an inexpensive water bottom shut-off structure for a box extrusion yard for an underwater tunnel applied to a case where the widened portion of the box is only one.

Further, in a water stopping structure of an extrusion yard used in a method of constructing a submerged tunnel in which a group of connected boxes is sequentially extruded to the bottom of the water, the box penetrates into the water area on the extrusion start side of the box. An extruding yard provided with a possible water stop wall, the water level being adjustable on the shore side of the water stop wall, and the inside of the water stop wall being in contact with the outer peripheral surface of the normal width portion of the box. The front movable water stop gate which can be stored in the water stop wall when the widened part behind the normal width part of the box approaches, and slightly before the front movable water stop gate. The front movable water stop gate is provided to contact the outer peripheral surface of the widened portion of the box immediately before storing the front movable water stop gate to stop water, and immediately before the widened portion of the box passes, the front movable water stop gate is provided. -A rear movable type that projects after changing the water stop of the widening part to the port and contacts the outer peripheral surface of the normal width part behind the widening part of the box to stop water Mizuge - wherein the more becomes possible with bets, a box body extrusion Ya of undersea tunnel - providing de waterproof structure.

Further, in a water stopping structure of an extrusion yard used in a method of constructing a submerged tunnel in which a group of connected boxes are sequentially extruded to the bottom of the water, the box penetrates into the water area on the extrusion start side of the box. An extruding yard provided with a possible water blocking wall and provided with a water level adjustable on the shore side of the water blocking wall, which can be stored inside the water blocking wall inside the water blocking wall and protrudes toward the box side. A movable water stop gate is provided, and a taper portion is provided on the outer peripheral surface of the box at the boundary between the widened portion and the front and rear normal width portions. Adjust the storage and projection of the
The underwater tunnel is characterized in that the tip of the movable water stop gate is continuously brought into contact with the outer peripheral surface of the normal width portion, the taper portion, and the widened portion of the box so as to stop water. Provided is a waterproof structure for a box extrusion jar. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0011]

Technical Background of the Invention Hereinafter, a method of extruding a box, which is a technical background of the waterproof structure of the box extrusion jar of the present invention, will be described.

<A> Excavation of ditch First, as shown in FIG. 9, a ditch for installing a group of boxes is excavated at the bottom of the water area 100. In the land area, a double deadline 102 will be constructed near the shore side of the revetment 101 after placing earth retaining sheet piles along the edge of the trench excavation plan line. Then, the inside of the earth retaining steel sheet pile is excavated, and a groove 103 is excavated from the starting coastal area to the double deadline 102 as shown in FIG.

Although the shape of the groove 103 is excavated in accordance with the design shape of the underwater tunnel, in the present embodiment, the groove 103 will be described in order to describe the case of constructing a concave arc-shaped tunnel as shown in FIG. Excavation is also performed in a concave arc shape corresponding to this.

<B> Construction of Water-Stop Wall Next, as shown in FIGS. 10 and 11, a water-stop wall 200 is constructed at a position flooded by a predetermined distance from the starting coastal area. The construction position of the water stop wall 200 may be constructed at a depth at which the entire body 300 can be submerged. The shape of the water blocking wall 200 is, for example, as shown in FIG.
1 is provided to form a portal, and is erected in the excavated trench 103. The size of the opening 201 is designed to be slightly larger than the cross-sectional outer shape of the box 300.

On the inner peripheral surface of the opening 201, a water-stopping member 202, such as a wire brush, which comes into contact with the peripheral surface of the box 300.
Is provided. If the water depth at the construction position is shallower than the water depth at which the entire body 300 is submerged,
The column members may be simply erected on both sides of 0.

<C> Construction of an extrusion yard and a manufacturing yard As shown in FIG. 11, from the water stop wall 200 to the land,
An extrusion yard 400 and a fabrication yard 410 are provided in this order, and both yards 400, 410 are constructed on the extension of the concave arc of the groove 103. In the vicinity of the boundary between the extrusion yard 400 and the manufacturing yard 410, a gate-type or other braking reaction receiving wall 420 or a reaction receiving beam as shown in FIG. 11 is constructed.

Conventionally, the extrusion yard and the manufacturing yard are provided on the land along the coast of the water body. However, as in the present invention, the water level is lowered by installing the water stop wall 200, and these yards are manufactured. By providing the door in the water area, the extrusion distance of the box group can be reduced.

<D> Installation of Sliding Bearings As shown in FIGS. 10 and 11, sliding bearings 110 are installed at predetermined intervals along the bottom surface of the groove 103. As an example of the sliding bearing 110, a steel frame concrete base is supported by a steel pipe pile, and an iron plate or the like is attached to the surface of the base.

<E> Manufacture and pre-extrusion of box At a manufacturing yard 410, a box 300 of a reinforced concrete structure or a composite structure of a steel shell type is manufactured in a dry state.
In the box 300, one block is formed on a manufacturing yard 410 in a flow-wise manner for each block portion, and concrete is successively joined to form a predetermined number of block groups continuously and integrally. For example, they are integrally manufactured in units of 100 blocks of 10 blocks, pre-stress is introduced, and the connection between the blocks of 10 blocks is made by a joint or the like.

The boxes 300 sequentially manufactured as described above are:
Until the original extruder 430 is installed, extrusion is performed by a temporary extruder. For example, using a center hole jack installed under the water stop wall 200, the bottom plate of the box 300 is pulled with a PC steel wire, and is pre-extruded until the tip of the box 300 penetrates the reaction force receiving wall 420. Do the work.

<F> Initial extrusion of the box When the tip of the box 300 has passed the reaction force receiving wall 420, the original extrusion device 430 is installed. As a specific example, FIG.
As shown at 0 and 11, a predetermined number of PC steel wires 431 are stretched between the water blocking wall 200 and the reaction force receiving wall 420, and an extruding device 430 is mounted on the way. A tip device such as a hand girder 120 is attached to a tip bulkhead of the box 300.

FIG. 12 shows a specific example of the extruder 430.
As shown in (1), a pair of center hole jacks 432, 433 capable of holding and releasing a PC stranded wire 431 are used. These are installed by fixing the movable gantry 434 to a concave portion provided on the upper surface of the box 300.

After the box 300 has penetrated the reaction force receiving wall 420, the initial extruding operation is performed by the extruding device 430 until the tip of the box 300 penetrates the water blocking wall 200. Center
As shown in FIG. 12, the operation of the ball jacks 432 and 433 is such that, while alternately holding and releasing the wedges at both ends of the jack, one jack is extended and at the same time the other is contracted to move the movable base 434. Extrude the box 300.
When the extrusion device 430 approaches the water stop wall 200, the reaction
The extruder 430 is replaced on the 420 side and the above operation is repeated.

<G> After the water injection box 300 penetrates the water stop wall 200, the double cutoff 102 is removed and water is injected. At this time, water does not enter the extrusion yard 300 and the manufacturing yard 410 due to the water blocking wall 200.

Next, as shown in FIG.
By injecting water into the inside of 400 at a lower water level than the water area outside the water stop wall 200 and reducing the water pressure acting on the front surface of the housing 300, the force required for pushing out the housing 300 group is reduced, and The setting is made so that the body 300 group is not pushed back to the extrusion yard 400 side. That is, due to the gradient of the manufacturing yard 410 and the coefficient of friction between the sliding bearings 110 that support the weight of the moving group of boxes 300, etc., even if water pressure from the outer water area acts on the box 300.
The group is in a stopped state.

<H> Extrusion of the box The manufacturing and extrusion of the box 300 are repeated as described above, and the group of boxes 300 is extruded along a concave arc as shown in FIG. Then, the extruders are extruded until the tail end of the group of boxes 300 reaches just before the water stop wall 200, and the extruder is completed.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, when the length of a road tunnel to be constructed on the water floor is 1000 m or more, an emergency parking zone must be provided.
Becomes wider. The water stop wall 200 comes into contact with the outer peripheral surface of the box 300 so as to stop water, and prevents water from entering the extrusion jar 400. Therefore, it is necessary to effectively stop water in response to a change in the width of the box 300. Hereinafter, the water stopping structure of the present invention will be described.

<Water Stop Structure-1> FIGS. 1-4 show the water stop structure-1.
Is shown. Inside the water stop wall 200, a removable water stop gate 500, a fixed water stop gate 510, and a movable water stop gate 520 are arranged at right angles from the inner surface of the water stop wall 200 in this order from the outside water area side. Direction.

The removable water stop gate 500 is a wall made of steel or the like which can be cut and removed. As shown in FIG. 3, the water stop gate 500 has a normal width 310 of the box 300 passing through the water stop wall 200. The tip is protruded from the side with a length that makes contact with the tip, and aims at stopping water. A water-stopping member 501 such as a wire-brush is implanted at the distal end over the entire length. The upper and lower ends of the removable water stop gate 500 protrude forward, and as shown in FIG.
It is preferable to provide a fitting portion 502 that enters the edges of the upper surface 302 and the upper surface 302.

The fixed type water stop gate 510 is a wall made of concrete or the like integrally with the water stop wall 200. As shown in FIG. 3, the width of the box 300 passing through the water stop wall 200 is increased. Part 320
The tip is protruded from the side surface of the device so that the tip is in contact with the side surface, and water is stopped. A water blocking member 511 is provided at the distal end, and fitting portions 512 are provided at the upper and lower ends.

The movable water stop gate 520 is a wall made of steel or the like, and is housed in a slit 203 provided on the inner surface of the water stop wall 200.
It is arranged to be able to protrude. A water blocking member 521 is provided at the distal end, and fitting portions 522 are provided at the upper and lower ends.

When the box 300 is extruded and passes through the water stop wall 200, first, as shown in FIG. 3, the side of the normal width portion 310 of the box 300 is provided with the removable water stop gate 500. It is extruded in a state where it comes into contact with the water-stopping member 501 at the tip and water intrusion is prevented.

The widened part of the box 300 is attached to the removable water stop gate 500.
When 320 approaches, the water stop member 511 at the tip of the fixed water stop gate 510 comes into contact with the side surface of the widened portion 320 to prevent water from entering. In this state, as shown in FIG. 4, the protruding portion of the removable water stop gate 500 is cut and removed, and is passed through the widened portion 320.

Next, as shown in FIG. 4, the tail end of the widened portion 320 passes through the movable water stop gate 520, and the fixed water stop gate 510 comes into contact with the widened portion 320. While moving, the movable water stop gate 520 is protruded and the water stop
Is brought into contact with the side surface of the normal width portion 330 continuing behind the widened portion 320 to stop water.

While the fixed type water stop gate 510 is in contact with the widening portion 320, a dry work area 340 is formed behind the fixed type water stop gate 510. The operation of pulling out the water stop gate 520 can be performed. Finally, when the movable water stop gate 520 is pulled out, the mortar 210 for stopping and fixing the water is filled between the slit 203 and the movable water stop gate 520, and the passage through the widening section 320 is completed. . As described above, the present embodiment is a water stopping structure for a box extrusion jar of an inexpensive underwater tunnel applied to a case where the widened portion of the box is only one.

<Waterproof Structure-2> Waterproof Structure-2 shown in FIG.
Uses a forward movable water stop gate 600 in place of the removable water stop gate 500 of the water stop structure 1 and the movable water stop gate 520 of the water stop structure 1 is moved rearward. This embodiment is a water stop gate 610. Slits 204 are provided at two locations on the inner surface of the water stop wall 200 at intervals, and a forward movable water stop gate 600 and a rearward movable water stop gate made of steel or the like are formed.
610 is arranged so that it can be stored and protruded.

Various means for moving these front and rear movable water stop gates 600 and 610 are conceivable.
Each of the slits 204 is configured to be slidable by moving devices such as jacks 620 and 630 disposed at the back of the slit 204. Further, similarly to the water-stopping structure-1, the water-stopping members 601 and 611 are provided at the distal end.
However, fitting portions are provided at the upper and lower ends. In addition, packing 220 and
Arrangement 230 prevents water from entering each slit 204. Next, the operation of each gate will be described.

First, as shown in FIG. 5, the casing 300 moves forward in a state where the forward movable water stop gate 600 comes into contact with the outer peripheral surface of the normal width portion 310 to stop the water. Next, when the widening section 320 approaches, the forward movable water stop gate 600 is moved to the slit 204.
It is housed inside, but immediately before that,
610 contacts the outer peripheral surface of the widened portion 320 to stop water.

Then, as shown in FIGS.
Immediately before 0 passes, after changing the water stoppage of the widening section 320 to the front movable stoppage gate 600, the rear movable stoppage gate
610 is protruded and normally comes into contact with the outer peripheral surface of the width portion 330 to stop water. In addition, this embodiment and the form of the following water stop structure-3 are structures suitable for the case where the widened portion of the box has two or more places.

<Water Stop Structure-3> FIG. 8 shows the water stop structure-3. A slit 205 is provided on the inner surface of the water stop wall 200, and a movable water stop gate 700 made of a steel wall or the like is housed therein so as to be able to protrude. Various means for moving the movable water stop gate 700 are also conceivable. For example, similarly to the above water stop structure-2, the movable water stop gate 700 is slidably constituted by a moving device such as a jack 710 disposed at the back of the slit 205. . Further, a water stop member 701 is provided at the distal end, and fitting portions are similarly provided at the upper and lower ends. Further, a packing 230 is similarly provided on the side surface of the slit 205 on the side of the external water area.

On the other hand, on the outer peripheral surface of the box 300, a tape is formed at the boundary between the widened portion 320 and the normal width portions 310 and 330 in front and behind the widened portion.
A par 350 is provided. As a result, the mobile waterproof gate
If you adjust the storage and protrusion of the
701 is continuously changed from the normal width section 310 of the box 300 to the taper section 350.
→ Wide-width portion 320 → Taper portion 350 → Water can be stopped by contacting the outer peripheral surface of normal width portion 330.

[0042]

As described above, according to the present invention, by providing various water stop gates inside the water stop wall, it is possible to cope with a change in a widened portion such as an emergency parking zone of a box or a change in a normal width portion. As a result, good water stopping can be achieved.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a water stop structure-1.

FIG. 2 is an explanatory view of a water stop structure-1.

FIG. 3 is an explanatory view of a water stop structure-1.

FIG. 4 is an explanatory view of a water stop structure-1.

FIG. 5 is an explanatory view of a water stop structure-2.

FIG. 6 is an explanatory view of a water stop structure-2.

FIG. 7 is an explanatory view of a water stop structure-2.

FIG. 8 is an explanatory view of a water stop structure-3.

FIG. 9 is an explanatory view of a method of constructing an underwater tunnel.

FIG. 10 is an explanatory view of a construction method of a submerged tunnel.

FIG. 11 is an explanatory view of a method of constructing an underwater tunnel.

FIG. 12 is an explanatory view of a method of constructing an underwater tunnel.

FIG. 13 is an explanatory view of a method of constructing an underwater tunnel.

FIG. 14 is an explanatory diagram of a conventional technique.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Satoru Nagase 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation

Claims (4)

[Claims] 1. A watertight structure of an extrusion yard used in a method of constructing a submerged tunnel in which a group of connected boxes is sequentially extruded to the bottom of the water, wherein the box penetrates into the water area on the extrusion start side of the box. An extruding yard provided on a shore side of the water stop wall, provided with a possible water stop wall. The water stop wall corresponds to a change in the box width of the normal width portion or the widened portion of the box. Characterized in that it is provided with a water stop gate which always comes into contact with the outer peripheral surface of the box to prevent water from entering into the extrusion jar. Waterproof structure. 2. A watertight structure of an extrusion yard used in a method of constructing a submerged tunnel in which a group of connected boxes is sequentially extruded to the bottom of the water, wherein the box penetrates into the water area on the extrusion start side of the box. An extruding yard provided with a possible water stop wall and a water level adjustable on the shore side of the water stop wall, wherein the inside of the water stop wall is in contact with the outer peripheral surface of the normal width portion of the box. And a removable water stop gate that can be removed when the widened part behind the normal width of the box approaches, and a removable stop provided slightly in front of the removable water stop gate. Immediately before removing the water gate, a fixed water stop gate that contacts the outer peripheral surface of the widened portion of the box to stop water, and a box provided slightly before the fixed water stop gate, While the widened portion of the box is in contact with the fixed water stop gate, it is accommodated in the water stop wall, and the widened portion of the box projects just before passing through the fixed water stop gate, Mobile water stop gate in contact with the outer peripheral surface of the normal width of the widened portion rearward of achieving waterproofing - wherein the more becomes possible and bets, the undersea tunnel a box body extrusion Ya - de waterproof structure. 3. A water shutoff structure of an extrusion yard used in a method of constructing a submerged tunnel in which a group of connected boxes is sequentially extruded to the bottom of the water, wherein the box penetrates into the water area on the extrusion start side of the box. An extruding yard provided with a possible water stop wall and a water level adjustable on the shore side of the water stop wall, wherein the inside of the water stop wall is in contact with the outer peripheral surface of the normal width portion of the box. The front movable water stop gate which can be stored in the water stop wall when the widened part behind the normal width part of the box approaches, and slightly before the front movable water stop gate It is provided, just before storing the front movable water stop gate, contacts the outer peripheral surface of the widened portion of the box to stop water, and immediately before the widened portion of the box passes,
A rear-movable water stop gate for rearwardly moving the water stop at the widened portion to the front movable water stop gate and then projecting the water to contact the outer peripheral surface of the normal width portion behind the widened portion of the box to stop the water. A water-stop structure for a box extrusion jar of an underwater tunnel, characterized in that 4. A watertight structure of an extrusion yard used in a method of constructing a submerged tunnel in which a group of connected boxes is sequentially extruded to the bottom of the water, wherein the box penetrates into the water area on the extrusion start side of the box. An extruding yard provided with a possible water stop wall, and a water level adjustable on the shore side of the water stop wall, which can be stored inside the water stop wall and protrudes toward the box side inside the water stop wall. A movable water stop gate is provided, and a taper portion is provided on the outer peripheral surface of the box at a boundary between the widened portion and the normal width portion in front and behind the widened portion. By adjusting the storage and protrusion of the gate, the tip of the movable water stop gate is continuously brought into contact with the outer peripheral surface of the normal width part, taper part, widening part of the box to stop water A water-stop structure for a box extrusion jar of an underwater tunnel.