JPH0613835B2 - Underwater tunnel construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Use) The present invention relates to a method for constructing an underwater tunnel.

(Conventional technology) Conventional underwater structures are constructed by assembling precast concrete members underwater, draining water by a deadline, and then constructing under the same conditions as above ground, or by using a special formwork. The method of pouring submersible concrete into the bottom of the water and pouring underwater concrete has been taken.

(Problems to be Solved by the Invention) In the above-mentioned conventional construction method, since the underwater work increases, the construction cost increases. In addition, the cost is high and the construction period is long when the deadline is involved. Further, the underwater assembly of the precast member requires a fairly high level of technology. Furthermore, the underwater formwork method is difficult to construct when the depth of water is deep, so that the applicable range is limited.

Moreover, according to the conventional construction method, in order to prevent sea area pollution associated with construction, it is necessary to install and work a pollution diffusion prevention net.

The present invention has been proposed in view of the above problems of the prior art, and it is possible to construct a tunnel structure in water or in the sea economically and efficiently, and without pollution of the sea area. The point is to provide a construction method for an underwater tunnel that can be done.

(Means for Solving the Problems) In order to achieve the above object, according to the method for constructing an underwater tunnel according to the present invention, an annular tube made of a flexible membrane material having watertightness is continuously formed. With the connection
It is arranged at a predetermined position in water and anchored to the bottom of the sea, and then a pressure fluid is pressed into each of the tubes to expand it, and then a hardening material is pressed into each of the tubes to replace the pressure fluid. .

(Operation) According to the present invention, a continuous ring-shaped tube made of a flexible membrane material having watertightness is continuously installed and installed at a predetermined position in water, and then anchored to the water bottom ground. ,
A pressure fluid such as pressure water or pressure air is pressed into each of the tubes, and the annular tubes are expanded by the pressure of the pressure fluid to maintain a predetermined shape.

Thereafter, a hardening material such as concrete is press-fitted into each of the tubes, the pressure fluid in each tube is replaced with the hardening material, and the hardening of the hardening material is performed to construct an underwater tunnel of a required shape.

(Examples) The present invention will be described below with reference to illustrated examples.

(1) is an annular tube composed of a flexible membrane material having watertightness coated with PVC or the like on a base fabric made of synthetic fiber or glass fiber. The tube (1) joins the membrane materials To make them continuous.

After performing basic treatment of the seabed, the annular ring tube (1)
In order not to move the continuous body, the anchor is temporarily attached to the seabed (2) through the anchor material (3) and the anchor block (4).

Next, in each of the above-mentioned tubes (1), an injection port provided below
(5) Pressurized with pressure water or pressure air to expand it into a predetermined shape, and then from the injection port (5), a concrete having high fluidity as a hardening material and rapid hardening (6)
Pressing in to replace water or air (7) in each tube (1) with concrete (6), (8) in the figure is tube (1)
It is the outlet for water or air inside.

Thus, finally, the inside of each tube (1) is filled with concrete (6), and after the concrete (6) hardens to reach a predetermined strength, the area around each tube (1) is filled with (9). Backfill as shown to stabilize the tunnel.

After implementing measures to prevent the buoyancy of the tunnel, drain the water inside the tunnel and, if necessary, place a post-cast concrete ring (10) inside the tunnel to complete the construction of the final tunnel structure. .

In order to keep the underwater tunnel in a predetermined shape and size,
While adjusting the internal pressure of the cocrete (6) when press-fitting, adjusting the specific gravity of the concrete (6), or enclosing air in a part of the tube (1), the buoyancy adjusts the shape and dimensions. Plan.

As shown in FIG. 4, the tube (1) is formed by connecting the tubes (1) having circular cross-sections, and connecting the adjacent membrane members of the tubes (1) to each other so as to obtain a water blocking property. May be secured. In the figure, (11) is a joint portion of the film materials. Further, FIG. 5 shows that each tube (1) has concrete (6).
Shows the state of press-fitting.

Further, as shown in FIG. 6, the tubes (1) are connected to each other, and the concrete (6) is press-fitted into the tubes at every other intervals. After hardening the concrete (6), the intermediate tubes are hardened.
Concrete (6) is press-fitted into (1 ′), and as shown in FIG. 7, each intermediate tube (1 ′) and the tubes (1) on both sides of the intermediate tube (1 ′) are continuous, and the joint has a structure with high shear resistance. You can also do it. In the figure, (12) is a tie bar arranged in the tube (1 ').

(Effects of the Invention) According to the present invention, annular tubes made of a flexible material having watertightness are continuously spliced, arranged at a predetermined position in water and anchored to the submarine ground. Then, pressurize a pressure fluid into each of the tubes to expand it into a predetermined shape, and then press-fit a curable material into each of the tubes to replace the pressurizing fluid in each of the tubes to harden the curable material and allow it to cure underwater. By constructing a tunnel, it is possible to greatly reduce underwater work such as moving heavy objects underwater and diving work. Therefore, the work is easy and the safety is maintained, the work process is reduced, the construction speed is remarkably increased, and the hardening material is press-fitted into the limited enclosed space, so that the water quality is not polluted. .

Further, according to the present invention, it is possible to deal with the external pressure by adjusting the diameter of the tube and the strength of the hardened material according to the acting external pressure.

Furthermore, since the membrane material forming the tube has watertightness, the function of a waterproof sheet is exerted, and an underwater tunnel having high watertightness is constructed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of an embodiment of a method for constructing an underwater tunnel according to the present invention, FIG. 2 is a vertical sectional view of an underwater tunnel constructed by the method of the present invention, and FIG. FIG. 4 is a vertical sectional view showing a continuous body of an annular tube, FIG. 5 is a vertical sectional view showing a state after the concrete is press-fitted, and FIG. 6 is an annular shape. FIG. 7 is a vertical cross-sectional view showing another example of the continuous tube body, and FIG. 7 is a vertical cross-sectional view showing the state after the concrete is press-fitted. (1) …… Toroidal tube, (2) …… Sea floor, (3) …… Anchor member, (4) …… Anchor block, (5) …… Injection port, (6) …… Concrete.

Claims (1)

[Claims] 1. An annular tube made of a flexible membrane material having watertightness is continuously spliced and arranged at a predetermined position in water to be anchored to a submarine ground, and then pressure is applied to each of the tubes. A method for constructing an underwater tunnel, comprising injecting a fluid to expand the fluid, and then injecting a hardening material into each of the tubes to replace the fluid under pressure.