JPH10292773A - Method for connecting construction of underwater structure and shield tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of an underwater structure, and to shorten the term of works and curtail construction cost. SOLUTION: The underwater structure 12 is buried to the bottom 11 of water, underwater concrete 20 is placed into the underwater structure 12 and an opening is hermetically sealed, the shield tunnel 21 is excavated into the ground of the bottom 11 of water, and the exterior wall 24 of the underwater structure 12 and underwater concrete 20 are penetrated by the shield tunnel 21. A through-hole 28 is formed to a lining 27 and underwater concrete 20 from the inside of the shield tunnel 21, a section fronter than the through-hole 28 of the shield tunnel 21 is closed with underwater concrete 29, and the opening is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting an underwater structure and a shield tunnel suitable for application to, for example, a water intake facility or a water discharge facility.

[0002]

2. Description of the Related Art In a thermal power plant constructed along a coast, for example, a shield tunnel for water flow is excavated from an intake pump or a drain pump installed on land facilities toward the sea floor, and the excavation is performed at the tip of the shield tunnel. It is common to connect filter facilities to prevent underwater debris from entering the pump.

Conventionally, when connecting a shield tunnel for water flow and a filter facility, the filter facility is first constructed at a predetermined position in the sea. Next, a shield tunnel is excavated from the intake pump or the drain pump until the filter facility is reached. And it was common to open a through hole in the outer wall from the inside of the filter facility, and connect with a shield tunnel.

[0004]

However, in the conventional connection method between the filter facility and the shield tunnel, the upper end of the filter facility is extended to the surface of the sea in order to make a hole in the outer wall from the inside of the filter facility. As a result, seawater is prevented from entering the inside of the filter facility and the space is maintained, so that a part extending to the sea surface is additionally provided on a part originally required for the filter facility, and cost is reduced. There was a problem of getting up.

In addition, when a through hole is formed in the outer wall from the inside of the filter facility, the ground around the filter facility is improved or prevented in order to prevent inundation or inflow of sediment from the joint between the filter facility and the shield tunnel. Auxiliary construction methods such as freezing were required, which also caused an increase in construction period and construction cost.

Further, since the construction of the filter facility is performed offshore, a deadline method, a caisson method using Tsukishima, an installation caisson method using a steel shell, and the like have been used. However, there is a problem that it is necessary and disadvantageous in terms of construction period and construction cost.

[0007] Such a problem occurs not only when the filter facility and the shield tunnel are connected but also when various underwater structures and the shield tunnel are connected. SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem, and to provide a method of connecting an underwater structure and a shield tunnel capable of reducing the cost of the underwater structure and reducing the construction period and cost. To provide.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a method for connecting an underwater structure and a shield tunnel, and is configured as follows to solve the above-mentioned technical problem. That is, in the method of connecting an underwater structure and a shield tunnel according to the present invention, the underwater structure having a hollow and an opening provided on an upper side is buried to a predetermined depth in the ground at the bottom of the water, and the underwater structure is embedded in the underwater structure. After placing concrete, the opening is closed, a shield tunnel is excavated in the ground at the bottom of the water to penetrate the outer wall of the underwater structure and the underwater concrete with the shield tunnel, and the inside of the underwater structure is The underwater structure and the shield tunnel are connected by forming a through hole penetrating from the inside of the shield tunnel to the upper surface of the underwater concrete in the lining of the shield tunnel and the underwater concrete above the shield tunnel. After closing the portion of the shield tunnel beyond the intersection with the through hole with underwater concrete, the opening is sealed. Characterized in that it release.

In the method of connecting an underwater structure and a shield tunnel according to the present invention, a shield tunnel is formed by penetrating the outer wall of the closed underwater structure and the underwater concrete in the underwater structure. By forming a through hole in the lining of the shield tunnel and the underwater concrete above it to penetrate to the upper surface of the underwater concrete, the shield tunnel and the underwater structure are connected, so a work space is provided in the underwater structure Connection work can be performed without the need.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a method for connecting an underwater structure and a shield tunnel according to the present invention will be described.
This will be described in detail with reference to the drawings.

FIG. 1 to FIG. 7 are diagrams for explaining the work procedure of the method of connecting an underwater structure and a shield tunnel according to the present invention. In this connection method, first, as shown in FIG. 1, earth and sand on the water bottom 11 is excavated to a predetermined depth, and an underwater structure, for example, a lower component 13 of an intake tower 12 (FIG. 2) is installed therein. . The lower component 13 has a hollow cylindrical shape, and has an opening 14 at the upper end.

Next, as shown in FIG. 2, earth and sand are buried around the lower component 13 to the original position, and the lower component 13 is buried in the ground. Thereafter, the upper component 15 of the water intake tower 12 is attached to the opening 14 side of the lower component 13. Thus, the installation of the intake tower 12 is completed. The upper component 15 is provided with, for example, a filter 16 over the entire circumference, and its lower flange 17 is connected to connect the space inside the filter 16 of the upper component 15 and the internal space of the lower component 13. A tube 18 is provided.

After the upper component 15 is mounted on the lower component 13, the underwater concrete 20 is poured from the connecting tube 18 to a predetermined position in the lower component 13, as shown in FIG. The underwater concrete 20 has the properties as a structural member and the water stopping property.

Next, as shown in FIG. 4, a shield tunnel 21 serving as an intake channel from the intake tower 12 to, for example, an intake pump (not shown) is formed by a tunnel excavator 22 on the bottom of the water.
Excavate underground 1 The depth of the shield tunnel 21 is set in accordance with the lower component 13 of the intake tower 12.

The shield tunnel 21 is excavated until it penetrates the outer wall 24 of the lower component 13 and the underwater concrete 20 in the lower component 13 as shown in FIG. Then, a waterproof material 25 is injected between the shield tunnel 21 and the underwater concrete 20. Next, a hatch 26 is attached to the opening of the connection tube 18 in the lower component portion 13 to seal the space below the hatch 26.

After the water-blocking material 25 has hardened, as shown in FIG. 6, the tunnel lining 27 of the shield tunnel 21 and the underwater concrete 20 are penetrated and connected from the inside of the shield tunnel 21 in the lower component 13. A through hole 28 passing through the inside of the cylinder 18 is formed.

Next, as shown in FIG. 7, an underwater concrete 29 is poured into a space in a portion of the shield tunnel 21 which is ahead of the intersection with the through hole 28 to finish the surface. Thereby, the tip of the shield tunnel 21 is closed. Then, the hatch 26 attached to the connection tube 18 is removed. Thus, the connection between the intake tower 12 and the shield tunnel 21 is completed.

As described above, in the method of connecting the underwater structure and the shield tunnel according to the present invention, the shield tunnel 21 is formed by penetrating the outer wall 24 of the sealed intake tower 12 and the underwater concrete 20 in the intake tower 12. By forming a through hole 28 penetrating from the inside of the shield tunnel 21 to the upper surface of the underwater concrete 20 in the tunnel lining 27 of the shield tunnel 21 and the underwater concrete 20 thereon, the shield tunnel 21 and the water intake tower 12 are formed. Are connected, the connecting operation can be performed without providing a working space in the water intake tower 12.

Therefore, unlike the conventional case, it is not necessary to extend the water intake tower 12 to the surface of the water and to provide a working space in the water intake tower 12, so that the water intake tower 12 can be constituted only by functionally necessary parts. Thus, it is possible to reduce the cost of the water intake tower 12 as compared with the related art. In addition, since the construction of the water intake tower 12 does not require an auxiliary construction method such as ground improvement or freezing as in the related art, the construction period and construction cost can be reduced.

Further, since the water intake tower 12 simply arranges the lower component 13 in a hole dug in the water bottom 11 and mounts the upper component 15 on the lower component 13. Temporary work can be reduced in size as compared with the conventional methods such as the deadline method, the caisson method using Tsukishima or the installation caisson method using a steel shell. Therefore, the construction period and construction cost can be significantly reduced.

[0021]

As described above, according to the method for connecting an underwater structure and a shield tunnel of the present invention, a shield tunnel is formed by penetrating the outer wall of the underwater structure and the underwater concrete in the underwater structure. By connecting the shield tunnel and the underwater structure by forming a through hole that penetrates to the upper surface of the underwater concrete from the inside of the shield tunnel and the lining of the shield tunnel and the underwater concrete on it, Connection work can be performed without providing a work space inside.

Accordingly, it is not necessary to provide the working space in the underwater structure by extending the underwater structure to the surface of the water as in the prior art, so that the underwater structure can be constituted only by functionally necessary parts. Thus, the cost of the underwater structure can be reduced as compared with the related art. In addition, since it is not necessary to perform an auxiliary construction method such as ground improvement or freezing as in the related art in order to construct an underwater structure, the construction period and construction cost can be reduced.

Further, since the underwater structure is simply buried in the ground at the bottom of the water, the underwater structure is compared with a conventional construction method using a deadline method, a caisson method using Tsukishima or an installation caisson method using a steel shell. Therefore, temporary construction can be reduced in scale. Therefore, the construction period and construction cost of the underwater structure can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a work procedure of a method of connecting an underwater structure and a shield tunnel according to the present invention.

FIG. 2 is a cross-sectional view illustrating an operation procedure of a method of connecting an underwater structure and a shield tunnel according to the present invention.

FIG. 3 is a cross-sectional view illustrating an operation procedure of a method of connecting an underwater structure and a shield tunnel according to the present invention.

FIG. 4 is a cross-sectional view illustrating a work procedure of a method of connecting an underwater structure and a shield tunnel according to the present invention.

FIG. 5 is a cross-sectional view illustrating an operation procedure of a method of connecting an underwater structure and a shield tunnel according to the present invention.

FIG. 6 is a cross-sectional view illustrating a work procedure of a method of connecting an underwater structure and a shield tunnel according to the present invention.

FIG. 7 is a cross-sectional view illustrating an operation procedure of a method of connecting an underwater structure and a shield tunnel according to the present invention.

[Description of Signs] 11 Water bottom 12 Water intake tower (underwater structure) 20 Underwater concrete 21 Shield tunnel 24 Outside wall of shield tunnel 27 Tunnel lining

Claims (1)

[Claims] An underwater structure having a hollow upper opening is buried to a predetermined depth in the ground at the bottom of the water, and underwater concrete is poured into the underwater structure. Excavating a shield tunnel in the ground under the water floor, penetrating the outer wall of the underwater structure and the underwater concrete with the shield tunnel, from inside the shield tunnel in the underwater structure,
The underwater structure and the shield tunnel are connected by forming a through-hole penetrating to the upper surface of the underwater concrete in the lining of the shield tunnel and the underwater concrete above the shield tunnel, A method of connecting an underwater structure and a shield tunnel, comprising closing a portion of the opening from an intersection with the through hole with underwater concrete, and then releasing the sealing of the opening.