JP2627996B2 - 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 final connection method for a submerged box for connecting submerged tunnels which are successively connected to each other and extending, or for connecting a submerged tunnel and a submerged tunnel shaft.

[0002]

2. Description of the Related Art Conventionally, the final connection method of a submerged box in a submerged tunnel includes (1) a dry work method in which the periphery of the final connection portion is temporarily closed from the water surface to form a dry space. The underwater concrete method, in which a concrete form is enclosed and underwater concrete is poured into it, and (3) the water stop panel method, in which the surroundings of the submerged box connection are surrounded by panels to maintain watertightness and make the inside a dry space, etc. is there.

[0003] Of the above-mentioned conventional methods, in the case of the dry work method, it is difficult to perform the work in a deep water portion. There is a danger that the entire tunnel will be submerged, and in order to prevent this, the construction must be carried out with the bulkhead left, so work must be performed in a narrow space with poor working environment. There is a problem that restrictions are increased and a large amount of labor is required in quality control.

Further, in the conventional underwater concrete method, the assembling of the formwork is underwater work by a diver, and there are many problems in terms of safety management, workability, and quality control, and this problem is particularly remarkable when the water depth is deep. It is. 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 order to solve such a problem, the present applicant has recently proposed a final connection method of a submerged box as shown in FIGS. 6 and 7 (Japanese Patent Application No. 3-228257).

FIG. 6 shows a buried tunnel finally connected by this method, in which 10a and 10b are shown.
Is a vertical shaft, 11a is a submerged box extending sequentially from one of the vertical shafts 10a, 11b is a final submerged box connected to the tip of the vertical shaft via a flexible joint 14, and 12 is a final submerged box connected to the other vertical shaft 10b. It is a box. These two buried boxes 11b, 1
The two are finally connected by a wedge-shaped connecting cylinder block 13.

In the final connection using the connecting cylinder block 13, first, as shown in FIG. 7 (A), the final immersion box 11b and the shaft-side final immersion box 12 are connected to the joint end surfaces 20a and 20b on the final joint side in advance. Mold to the required slope and join end face 2
Those having water-stop rubbers 21a and 21b previously attached are used for 0a and 20b, and the ends are bulkheads 22 and 22.
Is sunk in a closed state, and both existing buried boxes 1
The joining gap 23 between 1b and 12 has a tapered shape in which the upper side is expanded. On the other hand, the connecting cylinder block 13 is
Are manufactured in advance in a manufacturing yard in a size corresponding to the size of the taper shape at both ends thereof, and both ends thereof are bulkhead 2
The door is closed at 4, 24, and is conveyed by a method such as floating on the sea, and is moved onto the joining gap 23.

Next, as shown in FIG. 7 (B), after the height adjusting cushion 25 is installed on the bottom surface of the joining gap, the connecting cylinder block 13 is sunk into the joining gap 23. As a result, water is temporarily stopped between the joint end surfaces by the waterproof rubbers 21a and 21b. After that, both bulkheads 22, 22 and 24, 24
The water in the closed chambers 27, 27 formed between
Pull out from 8, 28 to the existing box side. As a result, the connecting cylinder block 13 acts in the direction of being drawn into the joining gap 23 by external water pressure.

[0010] After the bulkheads 22, 22, 24, 24 are removed as shown in FIG. 7 (C) in a state where the water is stopped by the water-stop rubbers 21a, 21b in this manner, the insides are communicated with each other. The connection between the connecting cable 29 inserted into the connecting block 13 and the connecting cables 30 and 30 projecting from the end faces of the existing submerged boxes 11b and 12 and the casting of the cast-in-place concrete 31 are performed in the box. Perform in a dry space.

[0011]

However, in the final connection method using such a tapered connecting cylinder block 13, after inserting the connecting block cylinder 13 into the joining gap 23, the bulkheads 22, 24 at both ends are inserted. By draining the water between them, the connecting block cylinder 13 is brought into contact with the joining gap 23 by water pressure.
To be drawn in. Since the so-called hydraulic joining method is employed, the reaction force of the joining is received by the waterproof rubbers 21a and 21b, and the waterproof rubber is partially excessively applied to the waterproof rubber due to an error in the joint surface angle or an error in flatness. When the pressure is applied and the sliding frictional force acts, the waterproof rubber may be damaged depending on the strength of the waterproof rubber used. If the weight of the connecting block is light, a sufficient joining force may not be obtained due to the frictional resistance of the waterproof rubber.Therefore, when the water pressure on the end face of the existing There was a problem that the compressive force introduced into the joint of the above was reduced.

In view of such a problem, the present invention has a tapered connecting cylinder block inserted into a corresponding tapered joining gap, and temporarily joined by a water-stopping rubber to temporarily stop the water, thereby temporarily stopping the water. The purpose is to prevent damage by preventing the water pressure above the water stop pressure from being applied to the water stop rubber, and to act as a stopper at the time of joining to prevent loosening of the joint between the existing submerged boxes. is there.

[0013]

SUMMARY OF THE INVENTION The features of the present invention for solving the conventional problems as described above and achieving the intended purpose are as follows.
The final buried boxes laid down with the joining end faces facing each other,
Alternatively, the joining gap between the two joining end faces, which are closed by the bulkhead of the final pit and the tunnel shaft, respectively, is tapered, and the taper corresponding to the tapered shape in the joining gap. Buried box final connection method in which a tapered connecting cylinder block having a joint end face is inserted and a final connection is made between both joining end faces of the connecting cylinder block and opposed joining end faces via a waterproof rubber. In inserting the connecting cylinder block into the tapered joining gap, the joining end faces on both sides of the connecting tubular block, and the joining end face of the joining partner are provided with a shoe and a shoe receiver facing each other, An access shoe, which can freely enter and exit toward the mating side, is attached to a surface of either the shoe or the shoe receiver facing each other via a pushing rod, and the connecting cylinder block is provided. After inserting the hook into the joining gap and temporarily stopping the water with the waterproof rubber, the entrance / exit shoe is pushed out and joined to the opposing shoe or shoe receiver, and mortar is injected into the back of the entrance / exit shoe. The object is to prevent retreat, and thereafter, the water in the closed chamber between the connecting cylinder block and the existing bulkhead opposed thereto is drained and hydraulically joined.

[0014]

According to this method, when the connecting cylinder block is inserted into the tapered joint gap between the boxes that have already been installed, and the gap between the joint end surfaces is temporarily stopped by the waterproof rubber, the waterproof rubber does not Water is stopped without any significant deformation. In this state, the shoe and the shoe receiver of the joint surfaces face each other, and there is a gap between the shoe and the shoe receiver. Next, the in / out shoe is pushed out to the opposite side by the jack through the pushing rod, and the mortar is pressed into the back thereof, whereby the gap between the shoe and the shoe receiver is filled with the in / out shoe and the mortar. After the mortar is solidified, the water between the bulkheads is drained, and water pressure acts in the direction of pulling the connecting cylinder block into the tapered joint gap. Is pressed. This allows the transmission of the compressive stress in the axial direction of the buried tunnel.

[0015]

Next, an embodiment of the present invention will be described with reference to FIGS. The same parts as those in the above-described conventional example are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 shows a state in which the connecting cylinder block 13 is inserted between the joint end surfaces of the existing submerged boxes 11b and 12 to temporarily stop water. As shown in FIG. 2, the end surfaces of both the embedding boxes 11b and 12 are provided with waterproof rubber 21a (or 21b) at the outermost peripheral edge.
Are fixed in a ring shape, and shoes 41, 41 are vertically protruded from end surfaces of a pair of vertically oriented partition walls 40, 40 at an intermediate portion. As shown in FIG. 3, water-stopping rubber contact surfaces 42a and 42b are formed on both end surfaces of the connecting cylinder block 13, and a pair of partition walls 43,
A shoe receiver 4 is provided on the end face of the shoe 43 so as to correspond to the shoe 41.
4, 44 are protruded.

As shown in FIG. 4, a box-shaped access shoe 45 is fitted to each shoe 41 so as to be able to freely enter and exit toward the opposed shoe receiving side, as shown in FIG. The tip of the protruding pushing rod 46 is fixed, and is moved in and out by a jack 47 in the box 11b or 12. A cloth frame 48 is stretched between the shoe fitting side edge portion of the access shoe 45 and the outer surface of the base of the shoe 41, and when the access shoe 45 is on the retracting side, as shown in FIG. It is in a slackened state.

A mortar injection pipe 49 communicates with the entrance / exit shoe 45 as shown in FIG. 2 so that mortar can be pressed into a portion surrounded by the front surface of the shoe 41 and the entrance / exit shoe 45. .

The submerged boxes 11b, 12 thus constructed
The final joining by the connecting cylinder block 13 is performed by injecting water into the ballast tank in the connecting cylinder block 13 and submerging while adjusting the buoyancy of the connecting cylinder block 13, and as shown in FIG. In this case, the water stop rubbers 21a and 21b are brought into contact with the water stop rubber contact surfaces 42a and 42b of the connecting cylinder block 13 to temporarily stop water, so that the bulk heads 22 and 22 are , 24, 24 are closed. In addition, the entrance / exit shoe 45 of the shoe 41, 41 is opposed to the shoe receiver 44, 44 with a gap.

With the water temporarily stopped in this way, the jack 47 pushes the in / out shoe 45 through the rod 46 by the jack 47, and the front surface thereof is brought into contact with the front surface of the shoe receiver 44 as shown in FIG. Next, the mortar 50 is press-fitted into the entrance / exit shoe 45 through each mortar injection pipe 49 to fill the gap between the shoe 41 and the entrance / exit 45. Then, after the injected mortar 50 is solidified, the water in the sealed chambers 27, 27 is drained from the water drain plugs 28, 28 as in the case of FIG. As a result, in the direction in which the connecting cylinder block 13 is drawn into the tapered shape, water pressure is applied in addition to its own weight, so that the shoe,
The force is transmitted via the shoe supports 41 and 44, and the hydraulic connection is made firmly. Thereafter, the bulkheads 22 and 24 are removed and the connection cables 29, 29 and 3 are removed in the same manner as in FIG.
0 is connected and concrete 31 is cast.

[0021]

As described above, in the method for final joining of a buried box according to the present invention, a shoe and a shoe receiver are provided on the joint end face so as to face each other, and an access shoe is attached to one side thereof, and a tapered shape is provided. After inserting the connecting cylinder block into the joint gap and temporarily stopping the water with the waterproof packing, push out the entry and exit shoe,
By injecting mortar into the back and filling the gap between the shoe and the shoe receiver, and then hydraulically joining, the hydraulic block of the connecting block can be hydraulically joined without applying excessive shearing force to the waterproof packing. The stress transmission in the compression direction between the tubular block and the existing buried box became perfect, and the subsequent work such as connecting the connecting cables and placing concrete for cast-in-place connection could be performed under stable conditions. Things.

[Brief description of the drawings]

FIG. 1 shows a joining gap of a connecting cylinder block in a method of the present invention.
It is a longitudinal cross-sectional view which shows the temporary water stop state inserted in the inside .

FIG. 2 is a front view showing a joint end face of an existing buried box.

FIG. 3 is a front view showing a joint end surface of a connecting cylinder block.

FIG. 4 is a partially enlarged cross-sectional view showing a state before pushing in and out of the shoe;

FIG. 5 is a partially enlarged cross-sectional view showing a state after mortar is injected into the entrance / exit shoe.

FIG. 6 is a schematic side view of a submerged tunnel constructed according to the present invention and a conventional example.

FIG. 7 is a cross-sectional view showing a connection operation process of a conventional example.

[Explanation of symbols]

11b, 12 Final buried box 13 Connecting cylinder block 20a, 20b Joining end face 21a, 21b Waterproof rubber 22, 24 Bulkhead 23 Joining gap 25 Adjusting cushion 27 Closed chamber 28 Drain plug 29, 30 Connecting cable 31 Cast-in-place concrete 40, 43 partition wall 41 shoe 42 guide key 42a, 42b waterproof rubber contact surface 44 shoe receiver 45 accession shoe 46 push rod 47 jack 48 cloth formwork 49 mortar injection pipe 50 mortar

Claims (1)

(57) [Claims] 1. A joint between two final immersion boxes laid down with their joint end faces facing each other, or between the final immersion box and a tunnel shaft, each of which is closed by a bulkhead and opposed to each other. The gap is tapered,
A tapered connecting cylinder block having a tapered joining end face corresponding to the tapered shape is inserted into the joining gap, and a stop is provided between the joining end faces facing each other on both joining end faces of the connecting cylinder block. In the submerged box final connection method for final connection via water rubber, when the connecting cylinder block is inserted into the tapered joining gap, a joining end face on both sides of the connecting cylinder block and a joining end face of the joining partner are attached to the connecting end. And a shoe receiver is provided facing each other, and an access shoe which can freely enter and exit toward the mating partner side is attached to a surface of either the facing shoe or the shoe receiver via a pushing rod, After inserting the connecting cylinder block into the joint gap and temporarily stopping the water with a waterproof rubber, the entrance / exit shoe is pushed out and joined to the opposing shoe or shoe receiver, and Mortar is injected into the back of the block to make it impossible to retract, and thereafter, the water in the closed chamber between the connecting cylinder block and the bulkhead of the existing part opposed thereto is drained and hydraulically joined. Submerged box final connection method.