JPH09203061A - Last joint execution method of immersed tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to provide the last joint of the last immersed tube in an optional position when a plurality of immersed tubes are settled and are connected to form an immersed tunnel and to provide an execution method for facilitating stage of execution works. SOLUTION: An immersed tube 1 having a bulk head 51 on the end and a double pipe last joint 2 having a bulk head 53 on the end capable of sliding the peripheral surface thereof are manufactured together as a unit. After the immersed tube 1 is settled to an opposite position of a bulk head 52 of the existing immersed tube 3, the double pipe last joint 52 is drawn to the existing immersed tube 3 therefrom, water between the bulk head 51 of the double pipe last joint 2 and the bulk head 52 of the existing immersed tube 3 is discharged in a state to cut off external water through a gasket 6 to make hydraulic pressure joint, and then, a double pipe returning prevention key is filled with mortar from the inside of the immersed tube, water is poured between the bulk head 51 of the immersed tube 1 and the bulk head 53 of the double pipe last joint after the vure, and after secondary cut-off is made, all bulk heads 51, 52 and 53 are removed.

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 is dug on the seabed and manufactured on land in advance and towed one after another to the site to connect the submerged boxes to form a submerged tunnel. The present invention relates to a final joint construction method for a submerged box having a tubular structure.

[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. For example, in the case of the underwater concrete method, the assembling of the formwork is underwater work by a diver, and when the water depth is deep, the workability and safety are poor, and the underwater concrete is used as a waterproof material at the time of construction And quality control of concrete is an important issue.

[0003] On the other hand, Japanese Patent Application Laid-Open No. 57-24798 discloses a method of applying a final joint of a submerged box proposed in view of the actual situation of difficulties in work efficiency and safety. A watertight valve chamber is telescopically connected to a telescopic tube type so that it can be extended and contracted in a watertight manner. The final box is installed at a position opposite to the existing box to be joined to the same box. Since a space having an atmospheric pressure surrounded by the bulkhead is required, four bulkheads are required, and the structure between the water stop panel and the final box is watertight in advance, That complicates the structure and increases the cost of the bulkhead.

[0004] In the above-mentioned conventional final joint construction method, the water stop valve chamber is pulled toward the existing box, and the packing of the connection end face of the water stop valve chamber is crimped to the connection end face of the existing box. Since the bulkhead chambers between the valve chambers are closed and the water in the chambers is drained and the existing box and the water shutoff valve chamber are hydraulically joined, a water injection work process is required.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a plurality of submerged boxes can be successively sunk and the final joint of the final box can be provided at an arbitrary position when they are connected to form a submerged tunnel. The problem to be solved is to provide a final joint construction method for a submerged box that is simple, has an easy work process, and is economical.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a submerged box having a bulkhead at an end thereof and a double pipe final joint having a bulkhead at an end slidable on the outer periphery thereof are integrally formed on a land during the production of the box. Pre-fabricated in a yard, etc. and sunk the submerged box at a position opposite to the bulkhead of the existing submerged box, then pull the double pipe final joint from the existing submerged box to the existing submerged box with a jack and make a rubber The water between the bulkhead of the double pipe final joint and the bulkhead of the existing submerged box is drained and hydraulically joined while the external water is blocked via a gasket such as After injecting mortar into the heavy pipe return prevention key and curing, drain between the bulkhead of the submerged box and the bulkhead of the double pipe final joint, remove all bulkheads after performing secondary water stoppage Final joint construction method for submerged box Rannahli, Furthermore, the present invention is in the final joint construction method of the 沈埋 a box, also with its features the use of a shear key, or compression key as a key to prevent the return double pipe.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a double pipe final joint construction process to which the final joint construction method for a submerged box of the present invention is applied will be described below with reference to the drawings. First, in the method of the present invention, the submerged box 1 shown in FIG. 1 (A), which is to be submerged as the final box, is formed on the outer periphery of the submerged box 1 in the longitudinal direction when it is produced in the production yard. The slidable double pipe final joint 2 is integrally manufactured when the box body is manufactured.

Next, as shown in FIG. 1, the submerged box 1 in which the double pipe final joint 2 is integrally formed on the outer periphery is laid at a position opposite to the existing submerged box 3 shown in FIG. The double pipe final joint 2 is pulled toward the existing submersible box 3 from the existing submerged box 3 by the pulling jack 4 as shown by an arrow P.
In FIG. 1, the submerged boxes 1 and 3 and the double pipe final joint 2 are provided with bulkheads 51, 52, 53, respectively, and water is shown by diagonal lines in the following drawings.

Next, as shown in FIG. 3, the bulkhead 52 of the existing submerged box 3 and the bulkhead of the double pipe final joint 2 are inserted via the gasket 6 made of rubber or the like provided on the outer peripheral end of the existing submerged box 3. 53 is cut off from the outside water, and the water W therebetween is drained to the existing submersible box 3 side by the drainage device 7, whereby water pressure acts on the bulkhead 53 on the double pipe final joint 2 side,
The submerged box 3 and the double pipe final joint 3 are hydraulically joined.

Further, as shown in FIG. 4, a shearing key is used as a double pipe return preventing key 8 from the inside of the submerged box 1, and air A is sent into mortar stoppers 9 provided at both ends of the key. Mortar M is injected into the heavy pipe return prevention key 8 for curing. In the present embodiment, a shear key that prevents the double pipe final joint 2 from returning due to the shearing force of the mortar M injected into the double pipe return prevention key 8 is used, but as shown in FIG. Then, the force that the double pipe final joint 2 tries to return is transmitted to the submerged box 1 via the mortar M injected into the mortar stopper 9, and the double pipe final joint 2 returns due to the compressive force of the mortar M. Prevent compression key 81
It can also be.

After curing the mortar M, as shown in FIG. 5, the water W between the bulkhead 51 of the submerged box 1 and the bulkhead 53 of the double pipe final joint 2 is drained by the drainage device 7 to the submerged pipe 1.
After draining to the side, as shown in FIG. 6, secondary water stop is performed between the outer peripheral end of the submerged pipe 1 and the inner peripheral face of the double pipe final joint 2 to weld the water stop material and the mortar for water stop. 10 is injected, and a water blocking material 11 such as a secondary water blocking rubber is installed on the inner peripheral surface of the gasket 6 hydraulically joined to the double pipe final joint 2 and the submerged pipe 3, and as shown in FIG. After removing all of the bulkheads 51, 52, 53 and installing the connecting cable 12 via the coupler 13 and arranging the reinforcing bars 14 as is done with normal fittings as well as final fittings, FIG. As shown in, the post-cast concrete 15 is applied to the reinforcing bar 14.

The construction flow of each step shown in FIGS. 1 to 8 is shown in the flow chart of FIG. 9, and according to the method of the present invention, the above-mentioned Japanese Patent Laid-Open No. 57-247 is used.
Compared with the invention of No. 98, a space such as a water shutoff valve chamber surrounded by two bulkheads and having an atmospheric pressure is not required, and the number of bulkheads in the final joint portion of the present invention is 1 compared with the conventional example. You can use less.

Further, in the above-mentioned conventional example, the structure in which the water blocking panel and the final box are water-tight in advance is not necessary in the present invention. Further, the method of the present invention does not require all the working steps of injecting water between the double box structure and the submerged pipe 1, and the present invention is far advanced compared to the conventional example in each point other than the above. The mechanism is adopted.

If only the double pipe final joint 2 is made to have a steel shell structure instead of a reinforced concrete structure, and underwater concrete is poured into the steel shell after the joining is completed, the double pipe final joint 2 will be drawn. Since the weight when pulled by the jack is small, it is possible to prevent the final joint of the double pipe from hanging down, and the construction accuracy is improved.

[0015]

According to the method for constructing the final joint of the submerged box of the present invention described above, the structure of the double pipe final joint used is simple, the working process is easy, and the economical efficiency of the work is improved. be able to. In particular, in the present invention, the final joint part of the sunk tunnel can be set at any position of the sunk box.

Further, the water pressure joint of the double pipe final joint is
It is possible to absorb the three-dimensional deposition error by changing the contact surface dimension of the gasket made of rubber or the like of the double pipe final joint, which is the same as the procedure of the ordinary submersible boxes.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view of an essential part showing a submerged state of a submerged box in which a double pipe final joint is integrated for explaining a construction concept of an embodiment of a process according to a construction method of the present invention.

FIG. 2 is a side sectional view of an essential part showing drawing of the final joint portion of the double pipe subsequent to FIG.

FIG. 3 is a side sectional view of essential parts showing hydraulic joining by draining water between the bulkhead of the double pipe final joint portion and the bulkhead of the existing submerged box subsequent to FIG. 2;

FIG. 4 is a side sectional view of an essential part showing the injection of mortar into the double pipe return preventing shear key, which is subsequent to FIG. 3;

FIG. 5 is a side sectional view of an essential part showing drainage between the bulkhead of the double pipe final joint and the bulkhead of the submerged box, following FIG. 4;

FIG. 6 is a side sectional view of a main part showing welding of the waterproof material, injection of mortar in the waterproof material, and installation of a secondary waterproof rubber subsequent to FIG. 5;

FIG. 7 is a sectional side view of the essential parts showing the post-casting concrete part rebar assembly and connection cable installation subsequent to FIG. 6;

FIG. 8 is a side sectional view of a main portion showing post-casting concrete pouring following FIG.

FIG. 9 is a construction flowchart of each step of FIGS. 1 to 8.

FIG. 10 is a side sectional view of an essential part using a compression key as a double pipe return prevention key.

[Explanation of symbols]

1 Submerged box 2 Double pipe final joint 3 Submerged box 4 Pulling jack 6 Gasket 8 Double pipe return prevention shear key 11 Water stop material 12 Connection cable 14 Reinforcing bar 15 Post-cast concrete M Mortar 51 Bulkhead 52 Bulkhead 53 Bulkhead 81 compressed key

Claims (3)

[Claims] A submerged box having a bulkhead at an end;
A double pipe final joint having a bulkhead at its slidable end on its outer periphery was integrally manufactured at the time of box manufacturing,
After submerging the submerged box at a position opposite to the bulkhead of the existing submerged box, draw the double pipe final joint from the existing submerged box to the existing submerged box, and shut off the external water via the gasket, and then the double pipe final joint Water between the bulkhead and the bulkhead of the existing submerged box is drained and hydraulically joined, then mortar is injected into the double pipe return prevention key from within the submerged box, and after curing, the submerged box A final joint construction method for a submerged box in which all bulkheads are removed after draining water between the bulkhead and the bulkhead of the double pipe final joint and performing secondary water stoppage. 2. The final joint construction method for a submerged box according to claim 1, wherein the double pipe return preventing key is a shear key. 3. The method for constructing a final joint for a submerged box according to claim 1, wherein the double pipe return preventing key is a compression key.