JPH04330195A - Method for watertight joining of final sunken caisson to abutment - Google Patents

Abstract

PURPOSE:To accomplish a joint part with good water cut-off performance by securing a sufficient gap between a final caisson and an abutment, carrying out drawing-out of the final caisson and sunken installation safely and certainly, and blocking the gap simply with steel products. CONSTITUTION:When the final one of the sunken caissons fabricated at the approaching zone of a sunken tunnel is joined watertightly to an abutment, joining of the sides is made by inserting a steel piece 7 into the gap between a pneumatic type rubber seal material 6 installed at the tail wing 2 of the final caisson 1 and the side wall 4 of the abutment.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for watertightly joining the rear end of an immersed box manufactured at the approach section of an immersed tunnel to an abutment.

0002

[Prior art and its problems] When constructing an immersed tunnel by using the approach part of the immersed tunnel as a production yard for immersed boxes, a dock is provided at the approach part and the production and withdrawal of the immersed boxes are repeated. At the stage where an arbitrary number of immersed boxes have been manufactured, an abutment is built at the boundary between the immersed tunnel part and the approach part to support the end of the immersed box, so at least the final box of the immersed box can be pulled out through the abutment part. It will be done.

By the way, as shown in FIGS. 1 to 3, a wing 2 is provided at the rear end of the final submerged box 1, the upper end of which protrudes above the water surface when the final submerged box 1 is in the submerged state.
The final box 1 pulled out from the approach part A through between the side walls 4, 4 of the abutment 3 is submerged and joined to the abutment 3 in a watertight manner with its rear end supported by the bottom 5 of the abutment 3. Conventionally, among these joints, not only the bottom joint but also the side joint (the joint between the side surface of the wing 2 and the side wall portion 4 of the abutment 3) were performed using a rubber sealing material. is common.

[0004] In the above-mentioned prior art, the wing 2
There is a limit to increasing the gap L between the side wall of the abutment 3 and the side wall 4 of the abutment 3, and there is little margin for the final box 1 to pass through the abutment 3. There was a problem that it could not be done accurately.

[0005]

OBJECTS AND CONSTRUCTION OF THE INVENTION The present invention has been made for the purpose of solving the problems of the prior art, and the structural feature of the method of the present invention is that an immersed box manufactured at the approach part of an immersed tunnel The final box was pulled out between both side walls of the abutment, and the rear end of the final box was placed and joined to the bottom of the abutment via a rubber sealant, and then attached to the side of the wing at the rear end of the final box. A steel material is inserted into the gap between the pneumatic rubber sealing material and the side wall of the abutment, and the sides are joined in a watertight manner.

[0006] As is clear from the above-mentioned characteristic configuration,
In the method of the present invention, when the final box of the immersed burial case and the abutment are watertightly joined, the bottom part is joined using only a rubber sealing material as in the past, but the side parts are joined using a pneumatic rubber sealing material. This is done in combination with steel materials.

[0007]

[Description of the Embodiment] In joining the final box of the immersed burial box and the abutment, the bottom part is joined as in the conventional manner, so a description thereof will be omitted, and the side part joining will be specifically explained below.

In FIG. 4, reference numeral 6 denotes a pneumatic rubber sealing material that is installed in advance on the side surface of the wing 2 at the rear end of the final box 1, and 7 inserts between the rubber sealing material 6 and the side wall portion 4 of the abutment. The illustrated steel material 7 is a rectangular steel tube, which is inserted while being guided by the flange of an H-shaped steel 8 attached to the end surface of the side wall 4. However, the H-shaped steel 8 has a stop between it and the steel material 7. A rubber sealing material 10 is attached in advance to ensure water resistance.

The rubber sealing material 6 is initially kept in a collapsed state by suctioning the air inside, and after inserting the steel material 7, the suction is released and the rubber sealing material 6 is expanded and brought into close contact with the steel material 7. Then, filling concrete is applied to the hollow part of the steel material 7, and mortar for water stopping is injected into the gap between the steel material 7 and the H-shaped steel 8.

In the figure, reference numeral 9 indicates an Ω-shaped rubber sealing material for secondary water stoppage.

[0011]

[Effects of the Invention] In the present invention, the final box of the submerged burial box and the abutment are watertightly bonded as described above, so even though the rubber watertight material is used, there is sufficient space between the final box and the abutment. Not only can the final box be pulled out and deposited safely and reliably, but this gap can be easily closed with steel material to form a joint with excellent water-stop properties. The effect of being able to do this can be expected.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the state when the final submerged box is pulled out from the approach section.

FIG. 2 is a front view showing the state when the final box that has been pulled out is sunk.

FIG. 3 is a plan view of the state shown in FIG. 2;

FIG. 4 is a plan view for explaining how the side parts are joined.

[Explanation of symbols]

1: Final box, 2: Wing, 3: Abutment, 4: Side wall, 5: Bottom, 6: Rubber seal material, 7: Steel material, 8: H-shaped steel, 9: Rubber seal material, 10: Rubber seal material.

Claims (1)

[Claims] [Claim 1] The final box of the immersed box produced at the approach part of the immersed tunnel was pulled out between both side walls of the abutment, and the rear end of this final box was placed and joined to the bottom of the abutment via a rubber sealing material. After that, insert a steel material into the gap between the pneumatic rubber seal material attached to the side of the wing at the rear end of the final box and the side wall of the abutment.
A method for watertightly joining the final box of an immersed burial box and an abutment, characterized by watertightly joining the sides.