JPH11323977A - Water stop structure for underwater tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a water stopping property over a long period and to dispense with electric corrosion prevention by forming the whole periphery of the outer surface of a caisson into a water stop structure with a corrosion- resistant and abrasion-resistant material, and protecting the water stop structure with protective concrete on the side faces and upper face of it. SOLUTION: The whole periphery of the outer surface of a caisson A is formed into a water stop structure with a corrosion-resistant and abrasion- resistant material, e.g. a stainless steel 1. Protective concrete 2 is further placed on the stainless steel 1 on the side faces and upper face of the caisson A to protect it from a breakage accident by the anchoring of ships. The whole periphery of the outer surface of the caisson A is formed into the water stop structure with the stainless steel 1, and only the bottom face of the caisson A is formed into a water stop structure with a stainless steel 1 thicker in thickness than the water stop structure on the side faces and upper face. When the caisson A is thrust on the water bottom in sequence, the bottom face plays rolls for friction reduction and abrasion resistance for the caisson A to be slid on support bases 3 supporting the caisson A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for a water bottom tunnel by extruding a box.

[0002]

2. Description of the Related Art As a method for stopping water in a submerged tunnel box, a method of making the box element itself watertight. Waterproofing the inside of the box element. Waterproofing the outside of the box element. Of the above methods, the most commonly used is the water-stop structure in the conventional underwater tunnel construction method, where the box is a steel plate that is exposed on the surface if it is a steel shell structure, and the side wall is used when the box is reinforced concrete. In general, the bottom surface is made of a water-blocking steel plate to form a water-blocking structure, and the top surface (the top surface of the box) is generally constructed as a water-blocking structure with rubber or other sheet waterproof.

[0003] However, in the above-mentioned conventional structure, a steel plate is used although it is entirely or partially, and considering that the box is a semi-permanent structure, it is necessary to provide a long-term use such as anti-corrosion. Must be treated.

[0004]

The above-mentioned water-stopping structure in the conventional underwater tunnel construction method not only requires a high cost for treatment such as cathodic protection, but also requires maintenance, and requires a long construction period. In short, there is a problem that the construction period and construction cost are uneconomical.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and has a long-term water-stopping property, does not require expensive treatment costs such as electrolytic protection, shortens the construction period, and reduces construction costs. It is an object of the present invention to provide a waterproof structure for a water bottom tunnel that can reduce the amount of water.

[0006]

As a means for solving the above-mentioned problems, the present invention relates to a water-blocking structure of a submerged tunnel constructed by sequentially extruding a group of connected boxes to the bottom of a water, wherein the outer surface of the box is provided. The entire perimeter is made of a water-resistant structure using corrosion-resistant and abrasion-resistant materials, and the side and top surfaces of the box are further protected by the protective concrete to protect the water-stop structure. provide.

In the above water-stop structure of the underwater tunnel, the thickness of the water-stop structure made of the corrosion-resistant and abrasion-resistant material on the bottom surface of the case is larger than the thickness of the water-stop structure on the side and top surfaces of the case. The present invention provides a water-stop structure for an underwater tunnel, characterized in that:

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

<A> Overall Structure of Water-Stop Structure FIG. 1 is a sectional view showing a water-stop structure according to the present invention. In the watertight structure of the underwater tunnel constructed by sequentially extruding the connected boxes A to the bottom, the entire outer surface of the box A is made of a corrosion-resistant and abrasion-resistant material (for example, stainless steel 1 in this embodiment). Water-stop structure. The side surface and the upper surface of the box A have a waterproof structure in which the waterproof structure A is further protected by the protective concrete 2.

<B> Water-stop Structure on Side and Top of Box A The entire outer surface of the box A is formed of a corrosion-resistant and abrasion-resistant material such as stainless steel 1 to form a water-stop structure. On the side and top surfaces of the box A, a protective concrete 2
To protect the ship from damage caused by anchorage of the ship.

<C> Water-stop structure on the bottom of the box A water-stop structure is formed by stainless steel 1 on the entire outer surface of the box A, but only from the bottom of the box A, the thickness of the water-stop structure on the side and top. The water stop structure is also made of a thick stainless steel 1. When the box A is sequentially pushed out to the bottom of the water, the bottom plays a role of friction reduction and abrasion resistance for sliding on the support 3 supporting the box A.

[0012]

The construction of the underwater tunnel water stopping structure according to the present invention will be described below.

<A> Water-stopping work on the entire peripheral surface of the box In FIG. 1, the box A is sequentially pushed out to the bottom of the water while being supported by the bearing base 3 installed on the sliding bearing 4. Before extruding the box A, the stainless steel 1 is installed on the entire peripheral surface of the box A. Since the stainless steel 1 as a water stopping function also plays a role of reducing friction and abrasion resistance for smoothly sliding on the bearing base 3, the bottom surface of the box A is made of stainless steel 1 thicker than the upper surface and the side surfaces.

<B> Construction of protective concrete After the stainless steel 1 is installed on the entire peripheral surface of the box A, the protective concrete 2 is constructed on the top and side surfaces of the box A. The protection concrete 2 protects the stainless steel 1 and protects the case A from damage caused by anchoring of the ship.

[0015]

Since the present invention has been described above,
The following effects can be obtained. <B> Since the top and side surfaces of the box are protected by protective concrete, it can be protected from damage caused by anchoring of the ship. <B> Since the bottom surface of the box is made of a thick stainless steel layer, it provides a reliable waterproofing effect, and can be securely and safely constructed when extruding the box. <C> There is no need to apply electrolytic protection to the box, and the water stopping property can be maintained for a long period of time.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a water stopping structure according to the present invention.

Claims (2)

[Claims] 1. A water-stop structure for a submerged tunnel constructed by sequentially extruding a group of connected boxes to the bottom of the water, wherein the entire outer surface of the box has a water-stop structure made of a corrosion-resistant and abrasion-resistant material. The water stoppage structure of an underwater tunnel, wherein the side surface and the top surface further have a structure for protecting the water stoppage structure with protective concrete. 2. The waterproof structure of an underwater tunnel according to claim 1, wherein the thickness of the waterproof structure of the bottom surface of the box is made of a corrosion-resistant and abrasion-resistant material.
A water-stop structure for an underwater tunnel, characterized in that the water-stop structure is thicker than the water-stop structure on the side and top surfaces of the box.