JPH09203060A - Last joint execution method of immersed tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the last-joint execution method capable of providing the last joint of an immersed tunnel in an optional position and easily following installation permissible deviation of the last joint part. SOLUTION: The last joint section 3 with double construction consisting of an inside box body 4 and an outside box body 5 sliding each other between the existing two immersed tubes 1 and 2 are installed through a temporary setting beam 7 temporarily fixing it. Then, after hydraulic pressure joint is made by drawing either the outside box body or the inside box body from one immersed tube 1, either the outside box body or the inside box body is separated from the beam 7, and after it is temporarily fixed to one immersed tube, neither the inside box body or the outside box body temporarily fixed to the other immersed tube is drawn up to make hydraulic pressure joint, and after both of them are fixed, a joint section between the outside box body and inside box body is filled with mortar, water inside the last joint section is discharged to fix after the cure, and then, all bulk heads are removed to release temporarily fixing to construct box bodies.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submerged box which has been previously manufactured on land by digging the seabed and towed to the site and successively sunk. The present invention relates to a final joint construction method for a submerged tunnel using a final joint part having a double box structure including a box body and an outer box body.

[0002]

2. Description of the Related Art Conventionally, as described above, when a large number of submerged boxes are connected and submerged to form a submerged tunnel, the final joint method includes a water stop panel method, a terminal block method, a V block method, and an underwater concrete method. There were pros and cons, respectively. On the other hand, the final joint is a large structure and is manufactured in advance on the land yard, etc.However, some dimensional error is not eliminated during designing and construction, and the error that occurs during final sunk is originally It suffices to manufacture after measuring, but in the actual manufacturing process, if it is not manufactured before measuring the actual dimensions, there will be a problem in the process due to the number of manufacturing days.

Therefore, a final joint which is manufactured to have a shape corresponding to the installation dimension of the final joint portion of the existing submerged box, can easily follow the generated installation error, and can be provided at any position of the submerged tunnel. Realization of the construction method will be required.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a final joint can be provided at an arbitrary position when a plurality of submerged boxes are successively sunk and connected to form a submerged tunnel, and the final joint is installed. The problem to be solved is to provide a final joint construction method for a submerged tunnel that can easily follow a dimensional error.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a final joint portion of a double box structure consisting of an inner box body and an outer box body that slide between two existing submerged boxes is temporarily fixed. Installed through one of the submersible boxes, and after pulling the entire final joint with the pulling jack from one of the submerged boxes to perform hydraulic joining, either the inner box or the outer box is temporarily placed. After fixing it to one of the submerged boxes, pull it to the other submerged box by pulling the inner box or the outer box that is not fixed with a jack and perform hydraulic joining, and temporarily fix both. Mortar is injected into the connection between the outer and inner boxes, and after curing, the inside of the final joint is fixed and drained, all bulkheads are removed and temporary fixing is released to build the box. Final joint construction method for submerged tunnel and between two existing submerged boxes The final joint part of the double box structure consisting of the inner box and the outer box that slide with each other is installed via the temporary mounting beam that temporarily fixes them, and the final joint is pulled from one of the submerged boxes with a jack. After pulling the entire part and performing hydraulic joining, either the inner box or the outer box is separated from the temporary beam and fixed to one submerged box, and then pulled to the other submerged box with a jack. Hydraulically join by pulling the inner or outer box that is not fixed, and temporarily fixing both, then injecting shear mortar into the joint between the outer box and the inner box, and after curing. The final joint construction method of the submerged tunnel is to fix the inside of the final joint part, drain it, remove all bulkheads to release the temporary fixation, and construct a box body. It is also characterized in that shear mortar or compressed mortar is injected into the connecting portion between the outer box and the inner box.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A construction process in an embodiment to which the method for constructing a submerged tunnel final joint of the present invention is applied will be described below with reference to the drawings. First, a plurality of submerged boxes are successively sunk and connected. When forming a submerged tunnel, for example, one submerged box 1 shown in (B) in FIG. 1 and the other submerged box 2 shown in (A) are submerged, and the final joint portion 3 is installed between them. In order to form a continuous buried tunnel, a final joint part 3 having a double box structure composed of an inner box 4 and an outer box 5 slidable with respect to each other has been manufactured. As shown in 6 of 1 above, it is suspended as a unit with the temporary placement beam 7 by means of a hoist ship between the existing submersion boxes 1 and 2, and the upper portion of each submersion box 1 or 2 is placed through the temporary placement beam 7. It is temporarily placed on the temporary placement stand 8 provided at. The frictional resistance between the temporary placement beam 7 and the temporary placement stand 8 is made as small as possible.

A regular rubber gasket 9 is provided at the peripheral end of the inner casing 4 and a temporary rubber gasket 10 is provided at the peripheral end of the outer casing 5 in FIG.
The bulkheads 11A, 11B, 11C, and 11D are provided on the inner and outer boxes 2 and 5, respectively. Next, as shown in FIG. 2, the whole of the final joint portion 3 is pulled from one of the submerged boxes 1 by the pulling jack 12, and the bulkhead 11D of the submerged box 1 and the bulkhead 11C of the inner box 4 of the final joint section 3 are drawn. After the water between and is drained by the drainage device 15B and hydraulically joined in the direction of the arrow P ₁ , the inner casing 4 of the final joint portion 3 and the temporary fixing 6 of the temporary placement beam 7 are separated, As shown in (1), one submerged box 1 is temporarily fixed as shown by 13.

Thereafter, the outer casing 5 of the final joint portion 3 is attracted to the other submerged casing 2 by the pulling jack 12 as shown in FIG. 3, and the bulkhead 11A of the submerged casing 2 and the outer casing of the final joint portion 3 are drawn. The water between the bulkhead 11B of 5 and the drainage device 1
Drain by 5A and perform hydraulic joining in the direction of arrow P ₂ ,
The submerged box 2 and the outer box 5 are fixed by welding or the like shown by 14 in FIG. 4, and the temporary placement beam 7 is removed by a crane or the like.

Next, as shown in FIG. 4, a shearing mortar M is injected into the connecting portion 17 between the outer box body 5 and the inner box body 4 of the double box structure for curing, and after curing, the bulkheads 11B and 11C.
The space is drained by the drainage device 15C. In this embodiment, the mortar M is injected into the connecting portion 17, and the shear force of the mortar M connects the inner box 4 and the outer box 3 to form a shearing mortar. It is also possible to use a compressed mortar that connects the inner box 4 and the outer box 3 by the compressive force of.

Subsequently, as shown in FIG. 5, the outer box body 5 and the inner box body 4 are fixed by welding or the like shown by 14, and then the bulkheads 11A, 11B, 11C and 11D are removed,
As shown in FIG. 5, a rebar assembly and concrete placement are carried out in the recess shown by the arrow 20 in the final joint part 3 to construct a box body, and further, the temporary fixing 13 between the submerged box 1 and the final joint part 3 is removed, The secondary water-stop rubber 21 is attached in the same manner as a normal joint, and the connecting cable 22 is attached by the coupler 23 to complete the construction of the final joint.

FIG. 7 is a flowchart of the steps for constructing the final joint of the submerged tunnel shown in FIGS. 1 to 6, and the final joint portion 3 of the double box structure is described as a double box for convenience. In the above embodiment, the inner box 4 is provided on the right side and the outer box 5 is provided on the left side. Further, in the above-described embodiment, the inner box 4 is drawn first to perform hydraulic joining, but the outer box 5 side is drawn first to perform hydraulic joining, and the outer box 5 and the submerged box 2 are welded. After fixing by, for example, the inner box body 4 is pulled to perform hydraulic joining, the reverse procedure can be performed in the same manner as above.

[0012]

According to the method for constructing the final joint of the submerged tunnel of the present invention described above, only the final joint portion needs to be manufactured. Therefore, the final joint portion of the submerged box is manufactured in a shape according to the installation dimension. Moreover, it is possible to easily follow the installation error of the submerged box, facilitate the construction, and reduce the construction cost.

Further, the final joint of the submerged tunnel can be provided at an arbitrary position, so that it is possible to flexibly cope with site conditions.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view of an essential part showing a state in which a final joint part is installed between existing submerged boxes in one embodiment of a process according to a construction method of the present invention.

FIG. 2 is a schematic side sectional view showing a state of single-sided hydraulic joining following the step of FIG.

FIG. 3 is a schematic side cross-sectional view showing a state of hydraulic joining on the opposite surface subsequent to the step of FIG.

FIG. 4 is a schematic side sectional view showing a state at the time of injecting shear mortar following the step of FIG.

5 is a schematic side sectional view showing a state in which the bulkhead is removed following the step of FIG.

6 is a schematic side sectional view showing the completion of the final joint portion following the step of FIG.

FIG. 7 is a flowchart of the steps of FIGS. 1 to 6 described above.

[Explanation of symbols]

1 Submerged Box 2 Submerged Box 3 Final Joint Part 4 Inner Box 5 Outer Box 6 Temporary Fixation 7 Temporary Beam 11A Bulkhead 11B Bulkhead 11C Bulkhead 11D Bulkhead 12 Pulling Jack M Shear Mortar

Claims (4)

[Claims] 1. A final joint part of a double box structure consisting of an inner box and an outer box that slide between two existing submerged boxes, and a temporary joint beam to which the final joint is temporarily fixed. Set up,
After pulling the entire final joint part from one submerged box with a pulling jack to perform hydraulic joining, either the inner box or the outer box is separated from the temporary placement beam and temporarily fixed to one submerged box. After that, the inner box or the outer box not temporarily fixed by the pulling jack to the other submerged box is drawn to perform hydraulic joining, and after fixing both, the outer box and the inner box are separated. A final joint construction method for a submerged tunnel in which mortar is injected into the connecting portion and after curing, the inside of the final joint portion is drained and fixed, all bulkheads are removed and temporary fixing is released, and a box is constructed. 2. A final joint part of a double box structure consisting of an inner box and an outer box that slide between two existing submerged boxes, and a temporary joint beam to which the final joint is temporarily fixed. Set up,
After pulling the entire final joint part from one submerged box with a pulling jack to perform hydraulic joining, either the inner box or the outer box was separated from the temporary beam and fixed to one submerged box. After that, the inner box or the outer box which is not fixed by the pulling jack is drawn to the other submerged box to perform hydraulic joining, and after temporarily fixing both, the outer box and the inner box are connected. The final joint construction method for the submerged tunnel in which mortar is injected into the section, after curing, the inside of the final joint section is fixed and then drained, all bulkheads are removed and temporary fixing is released, and a box is constructed. 3. The method for constructing a final joint for a submerged tunnel according to claim 1, wherein shear mortar is injected into a connecting portion between the outer casing and the inner casing. 4. The method for constructing a final joint for a submerged tunnel according to claim 1, wherein compressed mortar is injected into a connecting portion between the outer casing and the inner casing.