JPH066872B2 - Submerged box connection method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a submerged box connection method suitable for constructing an undersea tunnel.

[Conventional technology and its problems]

In the conventional submersion method, various methods are used to connect the submersible box at the vertical shaft, but all of these methods require work boats such as diving work and hoist boats when connecting work. In addition, it is inevitable that the construction period is long and the construction cost is high because it is not only dangerous during the work but is also restricted by weather and sea conditions.

The present invention has been proposed in order to solve the above-mentioned conventional problems, so that the connection work of the submersion box in the vertical shaft portion can be performed in the air without requiring any diving work or work boat. It is an object of the present invention to provide a submerged box connection method that can improve the safety during construction, shorten the construction period, and reduce the construction cost.

[Means for solving problems]

A vertical shaft is constructed using a mountain retaining wall and girder support, and a connecting block with a cross section equal to the cross section of the submerged box is stored in the storage space of the connecting opening of the vertical shaft. The connection end face and the bulkhead are built in, then water is injected between the vertical shaft and the mountain retaining wall, the mountain retaining wall and the girder support are removed, and the connecting block is pushed out from the storage space, and the connecting block. In order to achieve the above-mentioned object by abutting the connection end faces of the submerged box and the connection end faces of the submerged box to drain the water in the room where the edge between the bulkhead and the open sea is cut off and connecting the submerged box and the shaft. is there.

〔Example〕

Hereinafter, a submerged box connection method according to the present invention will be described with reference to an illustrated embodiment.

First, the structure thereof will be described. The submerged box connecting method according to the present invention is implemented by a structure such as a connecting block A, a shaft B, a submerged box C and the like. Hereinafter, each structure will be described in detail.

(1) Connection block A (FIG. 2) The main structure of the connection block A may be substantially the same as that of the submerged box C.

A bulkhead 15 is provided on the side of the connecting block A that contacts the submerged box C, and a rubber gasket 14 is provided on the end face 13.
Install. The rubber gasket 14 may be attached to the end face 22 of the submerged box C.

An intake valve 16, a drain valve 17, a pressure gauge 18, etc. are attached to the bulkhead 15 in the same manner as in a general burial method. Note that these may be attached to the bulkhead 24 of the submerged box C. After the extrusion is completed, the sheath tube 19 for inserting the connecting cable 27 is embedded in order to connect with the submerged box C.

(2) Vertical shaft B (see FIG. 1) FIG. 1 is a schematic view of the vertical shaft B constructed by the excavation method using the mountain retaining wall D and the beam support 38.

When the vertical shaft B is constructed by the pneumatic caisson method, the open caisson method, etc., the mountain retaining wall D may be used as a temporary wall and removed after caisson is set down.

On the front floor of the shaft B, the rubber sink 1 to receive the submerged box C.
0, the sliding girder 12 for extruding the connecting block A is installed. In addition, a water blocking packing 11 is installed on the entire circumference in the gap with the connecting block A.

(3) Submerged Box C The submerged box C is a general submerged box. A bulkhead 24, a connecting cable sheath tube 25 containing a connecting cable 26 and the like are embedded in the end portion.

As described above, a rubber gasket is attached to the end face 22 of the submerged box C, and an intake valve, a drain valve, and a pressure gauge are attached to the bulkhead 24 depending on the construction. In this case, it is not necessary to attach them to the connection block A.

Next, the submerged box connection method according to the present invention will be described step by step.

(1) Construction of the connection block A (Fig. 1) Fig. 1 is a schematic diagram of a shaft B constructed by a general excavation method using a mountain retaining wall D and a girder support 38.

The connecting block A is made of, for example, a steel shell or a shaped steel, and is divided into blocks according to the construction of the vertical shaft B, and is sequentially assembled according to the construction of the vertical shaft B, and after the assembly is completed, the inside of the steel shell is filled with mortar, concrete or the like. A storage space which is slightly larger than the connection block A having a cross section equal to that of the submerged box C is provided in the connection opening of the vertical shaft B, and the connection block A is stored in this space.

When there is a space between the shaft B and the mountain retaining wall D, the connecting block A may be constructed at the position of the broken line in FIG.

Before pouring water between shaft B and mountain retaining wall D, connecting block A
A bulkhead 15 and a rubber gasket 14 are attached to the above, and a blocking material 21 is installed between the connecting block A and the shaft B so that the connecting block A does not move due to the water pressure caused by water injection.

(2) Water injection and removal of the mountain retaining wall (Fig. 1) Next, water is injected between the vertical shaft B and the mountain retaining wall D after the construction of the connecting block A and the vertical shaft B is completed.

After checking for leaks from the water-stop packing 11, bulkhead 15 and the like, the girder support 38 is removed and the retaining wall D is removed.

(3) Submersion of submerged box C (Fig. 2) Submerged box C is submerged by the generally used construction method.

(4) Extrusion of the connecting block A (Figs. 2 and 3) After the submersible box C is sunk at a predetermined position, the extruding of the connecting block A is started.

Install the jack 20 between the connection block A and the shaft B,
The blocking material 21 in FIG. 1 is removed.

The jack 20 needs to have a capacity greater than the total pressure of the total water pressure applied to the front surface of the connecting block A and the frictional resistance force of the bottom surface.
Move while maintaining balance.

If the jack 20 runs out of stroke,
The rubber gasket 14 is attached to the end face 22 of the vertical shaft B while sequentially performing the refilling using the blocking material 21 in FIG.
The connecting block A is extruded until it comes into contact with.

When the rubber gasket 14 and the end face 22 of the shaft B come into contact and the edge of the water between the bulkheads 15 and 24 and the open sea is broken, the pressure gauge 18 shows an increase in water pressure.

The connection end surfaces of the connection block A and the submerged box C are brought into contact with each other, and after confirming that the edges of the bulkhead and the open sea have been cut off, the intake valve 16 is opened and the stroke of the jack 20 is extended.
After the discharge of seawater from the intake valve 16 is finished, the drain valve 17 is opened to further extend the stroke of the jack 20 to drain the water in the bulkhead, and the extrusion of the connecting block A is finished.

(5) Connection of connecting block A and submerged box C (Figs. 3 and 4) After drainage between bulkheads is completed, the manholes 36 and 37 of the bulkhead are opened, and the position is confirmed by a transit or the like. If the position exceeds the allowable value, the manholes 36 and 37 are closed, water is injected between the bulkheads 15 and 24, the stroke of the jack 20 is shortened, the connecting block A is retracted and pushed again, and the position is corrected. It is also possible to do

After the connection block A is installed at a predetermined position, it is fixed with the blocking piece 27 in FIG. 4, the connection table 23 is inserted from the vertical shaft B side, and the connection table 26 and the coupler 29 embedded in the submerged box C are inserted. , And then tensioned with a center hole jack or the like, and then the jack 20 and the jack receiving base 21 are removed.

Then, both bulkheads 15 and 24 are removed, and the secondary water blocking rubber 28 is attached. When the secondary water blocking rubber 28 is attached, the connection tables 23 and 26, which hinder the work, are separated by the primary, and the secondary water blocking rubber 28 is attached and then connected again.

The above is, for example, the construction method in the case of forming the structure of the flexible joint between the connection block A and the submerged box C. However, in the case of the rigid joint, the connection table 2326 is not necessary, and the secondary water blocking rubber 28 is used. Do not do so, use a steel plate to block water.

(6) Connection of connection block A and vertical shaft B (Fig. 4) A blocking piece 27 is installed between the connection block A and vertical shaft B, and after removing the jack 20 and the jack receiving base 21, the waterproof steel plate 30 is attached. Weld and install.

The waterproof steel plate 30 is provided with grout holes and mortar or the like is filled in the clearance with the waterproof packing 11.

If necessary, rebar between the connection block A and shaft B,
A steel frame or the like is placed, and concrete 31 or the like is cast and fixed.

(7) Foundation work and backfilling work (Fig. 4) After the connection work is completed, fill mortar etc. between the crushed foundation stone 34 and the burial box C as well as the general burial box and refill the side and top of the burial box. I do.

〔The invention's effect〕

This invention has the above-mentioned structure, and when constructing an undersea tunnel, etc., a mountain retaining wall is provided, and a connecting block is constructed in the storage space of the vertical shaft and the connecting opening of the vertical shaft by using the girder support work. Since the connecting work does not require any diving work or work boats and can be performed in the air, safety during construction, shortening the construction period and significantly reducing construction costs can be achieved.

Moreover, even if the mountain retaining wall and the girder support are removed, the submerged box and the connection block can be connected in water by installing a bulkhead.

[Brief description of drawings]

1 to 4 show one embodiment of the submerged box connection method according to the present invention, and are all vertical sectional views of the submerged box. A ... Connection block, B ... Vertical shaft storing the connection block, C ... Adjacent sunk box, D ... Mountain retaining wall, 10 ... Recess, 11 ... Water-stop packing, 12 ... Sliding girder, 1
3 ... end face of connecting block, 14 ... rubber gasket, 15
... bulkhead, 16 ... intake valve, 17 ... drainage valve, 18 ... pressure gauge, 19 ... connecting table sheath tube, 20 ... jack, 21 ... jack cradle, 22 ... submerged box end face, 23 ... connecting table, 24 ... bulkhead,
25 ... Connection cable sheath tube, 26 ... Connection cable, 2
7 ... Blocking piece, 28 ... Secondary waterproof rubber, 29 ...
Coupler, 30 ... Still steel plate, 31 ... Concrete, 32
... water-stopping grout, 33 ... basic mortar, 34 ... basic crushed stone, 35 ... backfilling material, 36 ... manhole, 37 ... manhole, 38 ... cutting beam support work.

Claims (1)

[Claims] 1. A vertical shaft is constructed by using a mountain retaining wall and a girder support, and a connecting block having a cross section equal to that of a submerged box is stored in a storage space of a connecting opening of the vertical shaft, and the connection is made. Build a connection end face and a bulkhead in the connection opening of the block, then perform water injection between the vertical shaft and the mountain retaining wall, remove the mountain retaining wall and the beam support, and remove the connecting block from the storage space. It is characterized in that the squeezing box and the shaft are connected by extruding, draining the water in the room where the connection end surface of the connecting block and the connecting cross section of the submerged box are brought into contact with each other and the edge between the bulkhead and the open sea is cut off. Submerged box connection method.