JPS638278B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing an underwater tunnel using fabric formwork.

Conventional underwater tunnels are usually constructed using the immersion method, but this type of construction method not only requires a considerable amount of work space above the water surface when sinking the immersed box to the bottom of the water, but also requires large immersion equipment. I need. In particular, when a tunnel crosses a navigation channel (hereinafter referred to as a waterway), consideration must be given to the waterway, such as by constructing an alternative waterway, which often poses a hindrance to construction work.

This invention was developed in view of the above-mentioned circumstances, and its purpose is to lay a fabric formwork composed of a double pipe with an outer pipe and an inner pipe across the vertical shafts at the bottom of a waterway, and to By sealing the water and filling the space between the outer pipe and the inner pipe with concrete, and then draining the water in the inner pipe to construct an underwater tunnel, it is possible to avoid problems that may hinder ship traffic during construction. The object of the present invention is to provide a fabric formwork type underwater tunnel construction method that eliminates the problem and eliminates the need for large-scale submerged equipment.

The present invention will be described below using an example in which an underwater tunnel is constructed across a waterway.

First, vertical shafts 1 and 1 are constructed on both sides of waterway A.
Vertical shaft 1 is a vertical shaft as opposed to horizontal shaft or inclined shaft. It is used when constructing a tunnel and dividing the construction length depending on the topography.

Next, a fabric formwork 2 is laid at the bottom of the waterway A, spanning between the vertical shafts 1 and 1.

The fabric formwork 2 is constructed into a double tube with an inner tube 3 and an outer tube 4, and the space between the inner tube 3 and the outer tube 4 at one end thereof is closed.

The inner tube 3 and the outer tube 4 are made of linen, synthetic fiber, or the like, and are extremely durable and made of cloth with a mesh that prevents leakage of cement milk. In addition, inner pipe 3
Between the inner pipe 3 and the outer pipe 4, strings 5 made of rope or the like are attached radially between the inner pipe 3 and the outer pipe 4, and concrete 6, which will be described later, is attached between the inner pipe 3 and the outer pipe 4. It is arranged so that it is not filled by being biased in between.

Further, instead of the string 5, a spiral reinforcement 7 may be arranged between the inner tube 3 and the outer tube 4.

To lay the fabric formwork 2, if the spiral reinforcement 7 is not used, the closed end between the inner pipe 3 and the outer pipe 4 is pulled with a tow string 8 such as a rope or wire, and one shaft 1 is installed. Lay it in one direction of the shaft on the opposite bank.

Next, the inner pipe 3 is sealed with water from the water injection pipe 9 to inflate the inner pipe 3. After that, the concrete injection pipe 10,
Concrete 6 between the inner pipe 3 and outer pipe 4 from 10
Inject and fill. When the concrete 11 has developed sufficient strength, the water in the inner pipe 3 is drained.

On the other hand, when the spiral reinforcement 7 is used when laying the fabric formwork 2, the fabric formwork 2 is laid while sealing the inner tube 3 with water so that the fabric formwork 2 is not torn by the water pressure of the waterway A. It should be noted that work efficiency is improved if the spiral reinforcements 7 are formed short and arranged by sequentially adding them in the longitudinal direction of the tunnel. Reference numerals 11 and 11 indicate land route portions.

This invention consists of the above structure, and the following effects can be expected.

During construction, there will be no obstruction to ship traffic. Moreover, large-scale submerged equipment is not required.

[Brief explanation of the drawing]

1 to 3 are sectional views of a tunnel portion of a waterway showing the construction sequence of the present invention, and FIG. 4 is a sectional view of the tunnel. 1... Vertical shaft, 2... Fabric formwork, 3... Inner pipe, 4
... Outer pipe, 5 ... String, 6 ... Concrete, 7 ...
...Spiral muscle, 8...Tow string, 9...Water pipe,
10... Concrete injection pipe, 11... Land route section.

Claims (1)

[Claims] 1. A fabric formwork consisting of a double pipe consisting of an outer pipe and an inner pipe is laid across the shaft at the bottom of the channel, the inner pipe is sealed with water, and concrete is placed between the outer pipe and the inner pipe. A method for constructing a submerged tunnel using fabric formwork, characterized in that the water in the inner pipe is filled and then drained.