JPH0819683B2 - Submerged box final connection method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submerged box final connection method for joining submerged tunnels which are successively connected and extended to each other, or to a submerged tunnel shaft.

[0002]

2. Description of the Related Art Conventionally, the final connection method for a submerged box in a submerged tunnel is as follows: (1) A dry work system in which the final connection area is temporarily cut off from the water surface to form a dry space; enclosure in formwork, water concrete method of pouring water in <br/> concrete therein, (3)沈埋surrounds the periphery of the box-connecting portion in the panel, water stop formed by the dry space inside to maintain the watertight Panel method, etc.

[0003]

Among the above-mentioned conventional methods, in the case of the dry work method, it is difficult to carry out the construction in a deep water place, and because of the dry method by the temporary cutoff,
In the event of a flood or an inundation accident due to high tide, there is a danger that the entire tunnel will be submerged, and in order to prevent this there is no choice but to install with the bulkhead left, and for this reason a narrow space where the working environment is not good Have to work in
There is a problem that there are many restrictions on work and a great deal of labor is required in terms of quality control.

Further, in the conventional underwater concrete method, assembly of the formwork requires underwater work by a diver, and there are many problems in terms of safety management, workability, and quality control, especially when the water depth is deep. In addition, there is a problem in concrete quality control because underwater concrete is used as a waterproof material during construction.

Further, in the water stop panel system, since the installation of the water stop panel is performed underwater, there is the same problem as the above-described underwater concrete system.

In view of the above-mentioned conventional problems, the present invention has a method for final connection of a submerged tunnel to a submerged tunnel, which requires less diving work by a diver, facilitates quality and safety control, and has good workability even in deep water. The purpose is to provide.

[0007]

The features of the final method of submerging a buried box according to the present invention for solving the above-mentioned conventional problems and achieving the intended purpose are that the ends facing each other are bulkheads. At the final junction of the buried box that is closed and sunk, at least one of the opposite end surfaces of the existing existing submerged box that is facing is inclined so that the joining gap between the two end surfaces is tapered. The final joining is performed by inserting a wedge-shaped final connecting block having a tapered joining end surface corresponding to the tapered shape into the joining gap.

[0008]

In the method of the present invention, when the wedge-shaped final connecting cylinder block is inserted along the taper into the taper-shaped joint gap between the ends of the existing submerged casings facing each other, it stops at the position where the two dimensions match. .

After watertightly joining the end faces of both existing submerged boxes and the end face of the final connection block through the packing, water pressure acts by draining the water in the joint part, and the final connection block enters the joint gap. Be drawn in.

Next, by removing the block and the bulkhead at the end of the existing submersible box, the two existing submersible boxes are connected to each other. At this time, the water pressure applied in the direction of compressing the existing submerged boxes that are connected in large numbers in the longitudinal direction is removed to try to extend, but the extension force at that time is received by the final connection block.

[0011]

EXAMPLE An example of the present invention will be described with reference to FIGS.

FIG. 1 shows a buried tunnel finally connected by the method of the present invention.
Reference numeral b is a vertical shaft, 11a is a final-end submerged container that is sequentially extended from one vertical shaft 10a, 11b is a final-end submerged container at its tip, and 12 is a submerged container connected to the other vertical shaft 10b. A connection block 13 is provided between the two submerged boxes 11b and 12
Is finally connected with.

The final end submerged box 11b and the submerged box 11a in front of it are connected by a flexible joint 14 as shown in FIG. This joint 14 is provided in both boxes 11a and 11b.
Primary water-blocking rubber 15 compressed and interposed between the connection end faces of
And a secondary water-stop rubber 16 that is fixed to the inside of the end faces of the connecting cables 17a and 17b at both end faces of both boxes 11a and 11b.
By connecting a and 17b with the coupler 18 in a state where the primary water blocking rubber 15 is compressed, both boxes 11
A and 11b are connected so as to be able to expand and contract. Vertical shaft 10b
The flexible joint 14 having the same structure as that described above is also connected between the and the submerged box 12 connected thereto so as to be expandable and contractible.

Further, these submerged boxes 11a, 11b and 1
2 is connected to the box 1 previously sunk as shown in FIG.
1a or the end of the shaft 10b is kept closed by the bulkhead 20, and the next box 11a, 11b or 12 is sunk while the both ends are closed by the bulkhead 20,
The primary water-stop rubber 15 is interposed between the existing box and the new box to join them. In this state, as shown in FIG. 3B, by draining the water between the bulkheads 20, 20 at the joint, the new box is pulled toward the existing box side by water pressure and temporarily connected in a watertight manner. Next, as shown in FIG. 3 (C), the bulkheads 20 and 20 are removed, and a complete connecting work is performed by a connecting cable or the like in the dry box.

The final joining end faces 30a and 30b of the final end submerged casing 11b and the shaft-side submerged casing 12 facing the final end submerged casing 11b are inclined so that the upper end side is wider than the lower end side between the end faces. The joining gap 31 has a tapered shape with the upper side widened. The connecting block 13 is inserted into the joint gap 31, and the joint end faces 3 at both ends thereof are inserted as shown in FIG.
2a, 32b and both joint end faces 30 of the existing boxes 11b, 12
Water-stop rubber 33a, 33b between a and 30b
To stop the water and connect the connecting cable 34 to both boxes 11b,
The connecting cables 35a and 35b protruding from 12 are connected via a coupler 36, and the space between the end faces is filled with cast-in-place concrete 37. As a result, both boxes 11b and 12 and the connecting block 13 are rigidly connected.

Next, the step of final connection using the connecting block 13 having the above-mentioned structure will be described.

As shown in FIG. 5A, the final submerged box 11b.
The vertical shaft-side submerged box 12 is formed by previously molding the joint end surfaces 30a and 30b on the final joint side into a required inclination.
The a and 30b are pre-sealed rubbers 33a and 33b attached, and each end is sunk in a state of being closed by bulkheads 20 and 20.
The joining gap 31 between b and 12 is formed in a tapered shape with the upper side widened. On the other hand, the connecting block 13 is manufactured in advance in a manufacturing yard in a shape that matches the size of the bonding gap 31 and the taper shape of both ends thereof, and both ends thereof are bulkheads 40, 4.
It is closed at 0, transported by a method such as floating on the sea, and moved onto the bonding gap 31.

Next, as shown in FIG. 5B, after the height adjusting cushion 41 is installed on the bottom surface of the joint gap, the connecting block 13 is submerged in the joint gap 31. As a result, the water between the joint end surfaces is temporarily stopped by the water blocking rubbers 33a and 33b. Then, the water in the sealed chambers 42, 42 formed between the bulkheads 20, 20 and 40, 40 is drained.
Pull out from 3,43 to the existing box side. As a result, the connecting block 13 acts in the direction of being drawn into the joint gap 31 by the external water pressure, and at the same time, the existing submersible box 11a,
The water pressure that has compressed 11b and 12 in the axial direction is removed, and mainly the flexible joint 14 portion tends to extend, but the extension force at that time is the amount of extension force at that time.
Pre-tighten b with a coupler 18 or
It is also possible to deal with this by making a temporary temporary rigid connection between the submerged boxes 11a and 11b, the submerged box 12 and the vertical shaft 10b using a steel material or the like.

As shown in FIG. 5C, the bulkheads 20, 20, 40, 40 are removed in the state where the water is stopped by the water blocking rubbers 33a, 33b in this way, and the interiors are made to communicate with each other and then connected. The connection between the cables 34 and 35a, 35a and the operation of placing the cast-in-place concrete 37 are performed in a dry space in the box. After the construction of the cast-in-place concrete 37 is completed, the temporary rigid connection portion is opened and the compression force of the connection block 13 is used to take charge. In the above-mentioned embodiment, the joining gap between the existing submerged boxes has a taper shape with the upper side widened, but as shown in FIG. Alternatively, the tapered connecting block 13 may be used instead of the tapered connecting block 13. Further, the bonding gap 31 and the connection block 13 are
As shown in FIG. 7, only one side may be tapered.
Furthermore, in the above-mentioned embodiment, the extension is made from the compatible shafts 10a and 10b and the final connection is made between the submerged boxes 11a and 12, but one submerged box may be the frame itself of the vertical shaft 10b.

[0020]

As described above, in the submerged box final joining method of the present invention, the final joining gap between the existing submerged boxes is tapered, and the connecting block of the joining end face having a length and taper corresponding to the taper is formed. Since it is inserted into the joint gap and finally joined, the underwater work by the diver is almost unnecessary, the construction is easy even in a large water area, and the safety management is easy. The submerged box with irregular shape can be manufactured in the dry manufacturing yard on the ground like the normal submerged box, and prefabricated construction is possible, so the construction period is short and no underwater concrete is used. Quality control is easy because the work such as pouring concrete for connection is done in a large dry space.

Further, since the joint end surface is completely adhered by water pressure, it is excellent in waterproofness, and since it is joined by inserting a wedge-shaped block, the tolerance for construction error is large as compared with other construction methods. And so on.

[Brief description of drawings]

FIG. 1 is a schematic side view of a submerged tunnel constructed according to the present invention.

FIG. 2 is a cross-sectional view of a joint portion between existing buried boxes at the final connection end.

FIG. 3 is a cross-sectional view showing a connecting step same as above.

FIG. 4 is a sectional view of a final connection portion.

FIG. 5 is a cross-sectional view showing a connecting step of the above.

FIG. 6 is a perspective view showing another embodiment of the present invention.

FIG. 7 is a side view showing still another example of the present invention.

[Explanation of symbols]

 10a, 10b Vertical shaft 11a, 12 Submerged box 13 Connection block 14 Flexible joint 15 Primary water-stop rubber 16 Secondary water-stop rubber 17a, 17b, 34, 35a, 35b Connection cable 18, 36 Coupler 20, 40 Bulkhead 30a, 30b Joining end surface 31 Joining gap 32a, 32b Joining end surface 33a, 33b Water blocking rubber 37 Cast concrete 41 Cushion 42 Sealed chamber 43 Water drain plug

Claims (1)

[Claims] 1. A submerged box final joint, in which ends facing each other are closed and closed by a bulkhead.
Of the two facing end faces of the existing submerged casing facing each other, at least one of the end faces is inclined to form a joint gap between both end faces in a taper shape, and a taper shape corresponding to the taper shape is formed in the joint gap. A submerged box final connection method, characterized in that a wedge-shaped final connection block having a joint end face is inserted and finally joined.