JP2003213709A - Joint construction for immersed tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint construction for an immersed tube having a high absorbing function for displacement which can cope with troubles at a joint portion of the immersed tube and also have a high cut-off performance. <P>SOLUTION: At the joint construction of the immersed tube 1, a protruded portion 31 is provided in the peripheral direction of a joint end surface 2 of the immersed tube 1 and the inner side of the protruded portion 31 is formed with a recessed portion. A slide portion 4 movable toward the abutting surface of the immersed tube 1, and a jack 51 movable at the slide portion 4 by the expansion and contraction arranged at the rear of the slide portion 4 are stored into the protruded portion 31 of at least one of facing immersed tubes. Both tubes 1 are coupled together by protruding the coupling member 61 from the recessed portion 32 of the tubes 1, and the protruded portion 31 of the facing tube 1 is coupled by interposing a water cut-off member 7. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for a submerged box.

[0002]

2. Description of the Related Art As a conventional construction method for constructing a tunnel under the sea or a waterway, there is a submerged tunnel method. In this method, a submerged box a is manufactured at a land part called a dry dock, and the ship is towed to a predetermined position by a ship and sunk to the bottom of the water. The newly sunk submerged box a is sequentially connected to the submerged submerged box under the water to form one long tunnel, and then backfilled to construct the submerged tunnel.

Usually, the length of the submerged box a is 80 to 100.
m is long and the submersible boxes a are connected to each other by connecting the connecting material d1 protruding from each submerged box a through the connecting tool d2 and the like (FIG. 7).
reference). In addition, a gasket e made of an elastic material or the like is interposed in the connecting portion to absorb displacement such as an earthquake and ensure water stoppage. When both the submerged boxes a are hydraulically joined, the gasket e is crushed. On the contrary, when the gap between the connecting portions is opened due to displacement such as an earthquake, the protruding portion c1 arranged to face the gasket e.
The installation area will be smaller, and the resistance to water pressure will decrease, and water will leak into the box. In order to prevent this water leakage, a flexible water stopping material f of, for example, Ω type or bellows type is bridged over both projecting portions c1 on the inner peripheral side of the gasket e to perform secondary water stopping. There is.

As described above, since the gasket e has been conventionally used as a primary water stop, when designing the gasket e, for example, a gasket that does not leak water even if a displacement amount during an earthquake obtained from seismic resistance calculation is given. The safety of water leakage was aimed at by considering the collapse amount of e. Therefore, for a large amount of displacement, a gasket e with a high height is required, and in this case, the gasket e suffers a sideways phenomenon (not shown) when hydraulically joining the submerged box a, and the water blocking function cannot be achieved. I was afraid. Moreover, a flexible mechanism is separately installed in advance in a cross section substantially orthogonal to the axial direction of one submerged box a to take measures such as absorbing the displacement (not shown).

[0005]

The conventional joint structure of the submerged box described above has the following problems. <a> With only the gasket placed at the connection part of the submerged box,
The displacement capacity and water stopping capacity that can be handled are small. Therefore, a submerged joint structure that can cope with large displacement is desired. If the height of the water blocking material is increased in order to increase the displacement capacity of the joint portion of the submerged box, the water blocking material may easily fall sideways when connecting the submerged box, and a sufficient water blocking function may not be achieved. <B> When the flexible joint mechanism is provided in the middle portion of one submerged box, the box body is complicated to manufacture, resulting in a long manufacturing process. Further, in this case, a temporary facility for connecting the submersible boxes disposed on the left and right of the flexible mechanism on land is separately required, which increases the cost. Furthermore, since this connection must have a stress that can withstand the sinking of the submerged box and the connection, a separate member for firmly fixing the fixing member is required, and work for mounting the fixing member on land and removing it in water. Is necessary and uneconomical.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and provides a joint structure for a submerged box which has a high displacement capacity and a high water stopping capacity for the joint section of the submerged box. With the goal. It is another object of the present invention to provide a joint structure for a submerged box, which can surely maintain a water blocking function in the joint structure for the submerged box. Further, it is an object of the present invention to provide an economical joint structure for a submerged box which is easy to manufacture and has a short manufacturing process. In addition, it is an object of the present invention to provide a stable structure for a submerged box when the submerged box is settled and connected, at a low cost, and a joint structure for the submerged box that requires no special work in water.
The present invention achieves at least one of these objectives.

[0007]

In order to achieve the above object, a joint structure for a submerged box according to the present invention is provided with a projecting portion in the circumferential direction of a joint end face of the submerged box, and the projecting portion is provided. The inner side is formed of a recessed portion, and a slide portion that is movable toward the abutment surface of the submerged box on at least one of the protruding portions of the submerged box that faces the slide portion, and the slide by the expansion and contraction arranged behind the slide portion. And a jack whose movable part is movable, projecting a connecting member from the recesses of both submerged boxes and connecting them through a connecting tool, and a projecting part of the submerged box facing each other with a water blocking material interposed. It is characterized by being connected.

The submerged box joint structure of the present invention is characterized in that, in the submerged box joint structure described above, the water blocking material is arranged at the tip of the slide portion.

Further, in the joint structure of the submerged box of the present invention, in the joint structure of the submerged box described above, a flexible water blocking material is bridged and connected to the projecting portions of both the submerged boxes. It is a feature.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

<A> Submerged Box The submerged box 1 is a block having a length of 80 to 100 meters, and a large number of joints are formed to construct a submerged tunnel.
As the structure of the submerged box 1, various structures such as a normal RC (reinforced concrete) structure and a steel shell structure can be adopted.
The joint end surface 2 of the submerged box 1 is provided with a protruding portion 31 on the outer peripheral side edge portion, and the inner peripheral side of the protruding portion 31 is formed from a recess 32 (see FIG. 1). The slide portion 4 is fitted in the protruding portion 31 in a direction in which it can move toward the abutting surface of the submerged box 1,
Behind it, the jack 51 can be housed in the circumferential direction and the slide portion 4 can be projected. From the recess 32, the connecting members 61 arranged at regular intervals in the circumferential direction protrude.

The submerged box 1 has a box shape formed by closing the joint surfaces at both ends with a bulkhead 93 during submerging. The bulkhead 93 may be provided with shear keys 91, 92, a pulling jack, and a valve for draining water between the bulkheads 93 at the time of joining.

<B> Projection Part (See FIG. 1) The projection part 31 is provided so as to project on the outer peripheral edge of the joining end face 2. A slide portion 4 which is thinner than the wall thickness of the protruding portion 31 and which is continuous in the circumferential direction is arranged in the protruding portion 31, and a jack 51 is stored behind the sliding portion 4. The slide portion 4 does not necessarily have to have a continuous shape, and may have a shape that is discontinuous in the circumferential direction. As a result, not only the displacement of the submerged tunnel in the axial direction but also the displacement having an angle in the axial direction can be dealt with. In this, the projecting dimension of each slide part 4 is gradually changed from the end face of the projecting part 31 to incline the cross section of the submerged box 1 to stop water (not shown). In addition,
The slide portion 4 and the jack 51 may be arranged on at least one of the submerged boxes 1 arranged on the left and right of the connecting portion. Similarly, the waterproofing material 7 is also provided with one of the protruding portions 31L.
The opposite end surfaces of the protruding portions 31R form surfaces that can reliably stop water due to the presence of the water blocking material 7.
This may be a smooth surface, for example.

The jack 51 is arranged in the axial direction of the submerged tunnel, and the extension of the jack 51 causes the slide portion 4 to move.
Is projected from the end face of the protruding portion 31. The jacks 51 may be arranged in the storage spaces 53 formed individually (see FIG. 2). Further, the storage space 53 can be continuously formed with an exchange port 54 penetrating inside the submerged box 1,
This is used as a carrying path for taking in and out the jack 51 and the like. A partition wall or the like may be provided at the boundary between the storage space 53 and the exchange port 54. The jack 51 may be installed in the storage space 53 in advance from when the submersible box 1 is towed, or the jack 51 may be installed only after receiving a displacement due to an earthquake or the like after the submerged tunnel is constructed. In the case of the latter method, a fixed block 52 slightly longer than the size of the jack 51 is previously arranged in the storage space 53 to replace the jack 51. Further, the fixing block 52 can also be used for fixing the slide portion 4 after the slide portion 4 is projected according to the displacement. For the fixed block 52, for example, steel material can be used. Therefore, the jack 5
It can be prepared simply by cutting the fixing block 52 according to the extension dimension of 1. After the submerged box 1 is joined, a flexible water blocking material 8 can be bridged and connected to the inner peripheral sides of the protruding portions 31.

<C> Recessed portion (see FIG. 1) The recessed portion 32 is constructed on the inner peripheral side of the protruding portion 31. A connecting member 61, which is arranged at a constant interval in the circumferential direction, protrudes from the hollow portion 32 so as to face the adjacent submerged box 1. The depression depth and the cross-sectional shape of the recess 32 from the end surface of the projecting portion 31 are such that the work for connecting the connecting members 61 facing each other and the flexible water blocking member 8 can be performed.
As a place to be installed, the shape is made in consideration of the displacement angle of the connecting member 61 when the connection portion absorbs the displacement.

<D> Water-stopping material (see FIG. 1) The water-stopping material 7 is interposed between the protruding portions 31 of the submerged box 1 to be joined to maintain the water-stopping function. This stops the water by compressing and squeezing the water blocking material 7 at the opposing protruding portions 31. The location of the water blocking material 7 is preferably attached to the slide portion 4 (see FIG. 1), and may be disposed on the end surface of the opposing protruding portion 31L. The cross-sectional shape of the water blocking material 7 may be, for example, a trapezoidal shape, and a projection shape may be provided on the tip of the water blocking material 7, that is, on the surface that first contacts the opposing protruding portion 31R. Elasticity of the waterproof material 7,
The cross-sectional shape, etc. shall be determined in consideration of the amount of collapse that will not cause water leakage even if the amount of displacement during an earthquake obtained from seismic resistance calculation is given. For the waterproof material 7, for example, a conventional rubber gasket formed of an elastic material may be used.

<E> Connecting Material The connecting material 61 protrudes from the recess 32 at regular intervals in the circumferential direction (see FIG. 1) and is prevented from coming off from the submerged box 1. Alternatively, a tubular body such as a steel pipe may be embedded in the wall thickness of the submerged box 1 in the axial direction of the tunnel, inserted into the tubular body to be movable in the axial direction, and fixed after the submerged tunnel is constructed. The type of the connecting member 61 is not particularly limited as long as it can cope with the displacement of the submerged box 1 connecting portion. The connecting material 61 is the submerged box 1.
Are temporarily connected, and then connected via a connecting tool 62 (see FIG. 5). As this connecting method, for example, the end portion of the connecting member 61 may be integrated with the threaded steel rod, and the steel rod may be inserted from both ends of the connecting tool 62 having a lock nut fixed in the sleeve to be screwed and connected. . As the connecting tool 62, one that is relatively bendable with respect to the displacement of the submerged box 1 is used. In addition,
The connecting member 61 may be projected from one of the submerged boxes 1 and may be inserted into the other submerged box for connection.

<F> Flexible water-stopping material (see FIG. 5) The flexible water-stopping material 8 has an Ω-shaped cross-section across the inner peripheral edge of the projecting portion 31 facing it. It is a flexible material such as a bellows or the like, and is a material that maintains the secondary water blocking function of the water blocking member 7. With this shape, the displacement stress of the facing submerged box 1 can be expanded and contracted to be absorbed. Flexible waterproof material 8
After the displacement of the submerged tunnel, the water-repellent material 8 may be replaced with a water-blocking material 8 having a wide shape or the like depending on the opening size of the gap of the submerged box 1.

Next, an embodiment of the joint structure of the submerged box of the present invention will be described.

[0020]

[Embodiment] <B> Joining of submerged box (see FIG. 5) The submerged box 1 to be newly installed is pulled in from the side of the submerged box 1 that has already been laid down by using the pulling jacks and the shear keys 91 and 92. By discharging the water in both bulkheads 93 by using a valve or the like, the water blocking material 7 arranged between the submerged boxes 1 is
Due to the water pressure, the newly built submersible box 1 is pulled toward the existing submerged box 1 side and temporarily connected in a watertight state. Next, the bulkhead 93 is removed, the interiors of both submerged boxes 1 are communicated, and the connecting material 61 is joined in a dry state. In addition, the connecting member 6 facing each other
A connecting tool 62 or the like may be interposed in the connection of 1. A flexible water blocking material 8 is provided on the inner peripheral sides of the projecting portions 31L and 31R to provide a secondary water blocking function.

<B> Displacement of the submerged box due to external force (see FIG. 6) When an external force is applied to the submerged tunnel to widen the gap at the joint, the slide portion 4 is projected by extending the jack 51 according to the size of the gap. Let For example, when the submerged tunnel is displaced in the axial direction, the slide portion 4 is moved according to the distance.
When the joint portion is displaced at an angle in the axial direction at the joint portion, the slide portions 4 which are interrupted in the circumferential direction according to the distance of the gap may be protruded stepwise ( (Not shown). When the jack 51 is not arranged behind the slide portion 4 at the time of projecting, the fixed block 52, which is arranged in advance, is removed from the exchange port 54 and the jack 5 is removed.
Replace with 1. It is desirable that the protrusion of the slide portion 4 be pushed out and fixed at an early stage after the displacement of the connecting portion.

<C> After crushing the water blocking material 7 which is arranged by the predetermined projection of the fixed slide portion 4 of the projecting portion, the fixed block 52 having a size corresponding to the extension of each jack 51 is replaced. And fix the slide portion 4. In addition, the flexible water blocking material 8 that has been deformed due to the displacement at the joint may be replaced if necessary.

[0023]

Since the joint structure of the submerged box of the present invention is as described above, the following effects can be obtained. <B> A slide portion that is movable in the axial direction of the submerged box is housed in the protruding portion provided on the joint end surface of the submerged box.
Therefore, the joint of the submerged box can cope with a large amount of displacement by arbitrarily projecting the slide portion. Further, by changing the projecting dimension of the slide portion with respect to the joint end surface of the submerged box, it is possible to cope with an angular displacement. Furthermore, since the water blocking material that is normally used in the joint structure of the submerged box can be used, there is no fear of the water blocking material falling over, and it is economical. <B> The displacement of the submerged box due to the external force can be handled by the joint portion of the submerged box. Therefore, compared to the case where a flexible joint is provided in the middle of one submerged box, the production process is short and the production cost is low, and no special work is required when joining the submerged boxes, which is economical. is there. <C> The joint structure of the submerged box of the present invention is economical because the jack is installed and the slide portion is projected only after the displacement of the connection portion occurs.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of a joint structure for a submerged box according to the present invention.

FIG. 2 is a view on arrow AA of FIG.

FIG. 3 is a schematic view of one end of the joint structure of the submerged box of the present invention.

FIG. 4 is a view on arrow BB in FIG.

FIG. 5 is an explanatory view of an embodiment of the joint structure at the time of joining the submerged box of the present invention.

FIG. 6 is an explanatory view of an embodiment of a joint structure for a submerged box according to the present invention.

FIG. 7 is an explanatory view of an example of a conventional joint structure for a submerged box.

[Explanation of symbols]

1 ... Submerged box 2 ... Joined end face 31 .. Projection 32 ... Dimples 4 ... Slide part 51 ... jacks 61..Connecting material 7 ... Water stopping material 8: Flexible waterproof material

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masatoshi Kimura             1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei             Construction Co., Ltd. F-term (reference) 2D055 EA02 GC02 GC09 GD02

Claims (3)

[Claims] 1. A joint structure for a submerged box, wherein a projecting portion is provided in a circumferential direction of a joint end surface of the submerged box, and the inside of the projecting portion is formed by a recessed portion, and at least one of the facing submerged boxes is provided. The projecting part stores a slide part that is movable toward the abutment surface of the submerged box, and a jack that is movable behind the slide part and that can move the slide part. A joint structure for a submerged box, wherein the submerged box is connected by projecting a connecting material, and the projecting portions of the submerged boxes facing each other are connected via a water blocking material. 2. The joint structure for a submerged box according to claim 1, wherein the water blocking material is arranged at a tip of the slide portion. 3. The joint structure for a submerged box according to claim 1 or 2, wherein a flexible water blocking material is bridged and connected to the projecting portions of both submerged boxes. Submerged box joint structure.