JPH0819684B2 - Flexible connection method of the final connection part of the submerged box - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible connecting method of a submerged tunnel final connection portion for joining submerged tunnels extending from one another by successively connecting submerged boxes or for joining a submerged tunnel and a vertical 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. This problem is remarkable when a flexible joint having a complicated structure is adopted.

Further, in the conventional underwater concrete method, assembly of the formwork requires underwater work by a diver, and there are many problems in safety management, workability, and quality control especially when the water depth is deep, and underwater concrete is also used. Since it is used as a waterproofing material during construction, there was a problem in quality control of concrete.

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.

Further, in any of the methods, in the case of the final connection, the water pressure in the axial direction with respect to the sequentially extended submerged box is removed, so that it is necessary to prepare a special reaction force receiver.
Adopting a flexible joint having a complicated structure in such a special portion has a problem that the work is remarkably complicated and the difficulty is increased.

In view of such conventional problems, the present invention can be constructed even at a deep water depth, requires less diving work by a diver, is easy in quality and safety control, and can be applied to the final connection portion. An object of the present invention is to provide a flexible connection method for the final connection portion of the submerged box of the submerged tunnel in which the flexible joint can be easily incorporated.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems and achieve the intended purpose, the characteristic feature of the flexible connecting method of the submerged box final connecting portion of the present invention is that the opposite ends are opposed to each other. At the final junction of the submerged box, which is closed by a bulkhead and is sunk, at least one of the opposite end surfaces of the existing submerged box that is facing the other is tilted so that the joining gap between the two end surfaces is reduced. Final joining by inserting a wedge-shaped final connecting block having a tapered joining end face corresponding to the tapered shape in the joining gap and having a flexible joint structure integrally in the central portion To do.

[0009]

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 the end faces of both existing submerged boxes and the end face of the final connecting block are watertightly joined together through the packing, water pressure is applied by draining the water in the joining part so that the final connecting block is placed in the joining 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. After the connection is completed, the flexible joint structure in the center of the connection block absorbs the stretching force and the bending force.

[0012]

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.

A joint 14 is connected between the final end submerged box 11b and the submerged box 11a in front of it. The joint 14 may be a flexible joint or a rigid joint if necessary.

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,
A rubber gasket 15 is interposed between the existing box and the new box to join them. In this state, as shown in FIG. 2B, by draining the water between the bulkheads 20 at the joint, the new box is pulled to the existing box side by water pressure and temporarily connected in a watertight manner. Next, as shown in FIG. 2 (C), the bulkheads 20 and 20 are removed, and a complete connecting work is performed with 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, and between the both 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 as shown in FIG. 3, the joint end faces 32a and 32b at both ends thereof and the joint end faces 30 of the existing boxes 11b and 12 are joined together.
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.

As shown in FIG. 3, the connecting block 13 has a flexible joint structure 50 integrally incorporated in the central portion thereof. The flexible joint structure 50 is assembled in advance when the connecting block 13 is manufactured, and the connecting block 13 is formed in a plane orthogonal to the tunnel axis direction.
A rubber gasket 51 for primary water stopping was interposed in a compressed state between the joint surfaces around the end faces of the halves 13a and 13b having a shape divided into two, and was adhered to the inner side thereof across the gap between the joint surfaces. Rubber plate 52 and rubber gasket 51 for secondary water stoppage
Is composed of a large number of pairs of half-body temporary connection cables 53a and 53b for connecting the two halves while compressing them with a constant compression force, and a coupler 54 for connecting them.

The connection of the half bodies 13a and 13b is as follows.
In addition to the cables described above, bolts may be used and the block may be inside or outside.

Next, the above-mentioned final connecting step will be described.

As shown in FIG. 4 (A), the final submerged box 11b.
As the shaft-side submerged box 12, a joint end surface 30a, 30b on the final joint side is molded in advance to a required inclination, and each end is sunk in a state of being closed by bulkheads 20, 20. The joining gap 31 between the existing submerged boxes 11b and 12 is formed in a tapered shape with the upper side opened. 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 tapered shape of both ends thereof, and both ends are closed by bulkheads 40, 40.
This is transported by a method such as floating on the sea, and the bonding gap 3
Move 1 up. Next, as shown in FIG. 4 (B), after the height adjusting cushion 41 is placed on the bottom surface of the joint pore water,
The connection block 13 is submerged in the bonding gap 31. As a result, the water between the joint end surfaces is temporarily stopped by the water blocking rubbers 33a and 33b. After that, both bulkheads 20, 20 and 40, 4
The water in the sealed chambers 42, 42 formed between the drainage holes 0 and 0 is drained from the drain plugs 43, 43. This makes the connection block 1
3 acts in the direction of being drawn into the joint gap 31 by the external water pressure, and at the same time, the water pressure that has compressed the existing submersible boxes 11a, 11b and 12 in the axial direction is removed, and mainly the flexible joint 14 portion is Trying to grow,
At this time, the amount of extension force is increased by tightening the connecting cables 17a and 17b with the coupler 18 in advance, or the submerged box 1
It is also possible to deal with this by making a temporary temporary rigid connection between the 1a and 11b, the submerged box 12, and the vertical shaft 10b using steel or the like.

As shown in FIG. 4 (C), the bulkheads 20, 20, 40, 40 are removed in a state where the water is stopped by the water blocking rubbers 33a, 33b in this manner, 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. 6, 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.

[0022]

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 moreover, 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.

Further, since the flexible joint structure is integrally preliminarily incorporated and manufactured in the connecting block, even if the flexible joint structure is complicated, the flexible joint structure is installed independently of the final connection work at the bottom of the water. The effect is that you can do it.

[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 showing a step of connecting a joint portion of existing buried boxes.

FIG. 3 is a sectional view of a final connection portion.

FIG. 4 is a cross-sectional view showing a connecting step of the above.

FIG. 5 is a perspective view showing another embodiment of the present invention.

FIG. 6 is a side view showing still another example of the present invention.

[Explanation of symbols]

 10a, 10b Vertical shaft 11a, 12 Submerged box 13 Connecting block 20, 40 Bulkhead 30a, 30b Joining end face 31 Joining gap 32a, 32b Joining end face 33a, 33b Water blocking rubber 34, 35a, 35b Joining cable 36, 54 Coupler 37 Place hit Concrete 41 Cushion 42 Sealed chamber 43 Drain plug 50 Flexible joint structure 51 Rubber gasket 52 Rubber plates 53a, 53b Half body connecting cable

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 buried box final connection method comprising inserting a wedge-shaped final connection block having joint end faces at both ends and having a flexible joint structure integrally in a central portion for final connection.