JPH102200A - Constructing method of underground structure and retaining wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct an underground dam without receiving the constraint of the ground by executing a plurality of shields in parallel from a shaft to an underground section at intervals, integrally connecting sections among the shields and placing concrete into the shields. SOLUTION: A shaft 1 is excavated at a place receiving no constraint on the ground, a shield machine 2 is started in approximately the horizontal direction from the shaft 1 to an underground-dam construction predetermined place, and shields 3 are built extending over a plurality of layers at regular intervals in the vertical direction. The shaft 1 is excavated gradually to lower sections with successive starting from upper layers of the shields 3. All of the shields 3 are constructed, and the connecting sections of reinforced concrete construction, PC structure, plain concrete structure, SRC structure, steel structure, etc., are erected among the shields 3. All of the connecting sections among the shields 3 are built, and concrete is placed into the shields 3, thus completing the construction of an underground dam.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an underground structure such as a large underground dam, a large retaining wall, and a preceding underground beam.

[0002]

Conventionally, when constructing a large underground dam or retaining wall, construction has been carried out using large machines from the ground. Therefore, if the construction conditions on the ground are restricted, the construction is difficult. there were. The present invention provides a method capable of constructing an underground structure without being restricted by the ground.

[0003]

As a means for solving the above-mentioned problems, the present invention relates to a method for constructing a plurality of shields in parallel from a shaft in the ground at intervals and then constructing these shields.
The present invention provides a method of constructing an underground structure, characterized in that the fields are connected to each other.

Further, in a method for constructing a retaining wall comprising a retaining wall portion for holding a ground and a supporting bottom portion which is substantially horizontally continuous with a lower portion of the retaining wall in the ground side, a method for constructing the retaining wall from the shaft to the underground is provided. At the place where the retaining wall is to be constructed, a plurality of shields in a substantially horizontal direction are installed in parallel at intervals, and these shields are connected together to construct the retaining wall. A method for constructing a retaining wall, characterized by excavating the front surface, is provided.

[0005] Further, in a method of constructing a retaining wall comprising a soil retaining wall portion for holding the ground and a supporting bottom portion which is substantially horizontally continuous with the lower ground side of the retaining wall portion, the above-mentioned method is used to construct the retaining wall from the shaft to the underground. At the location where the retaining wall is to be constructed, a plurality of shields in a substantially horizontal direction are arranged side by side while joining the shields to construct a retaining wall, and then excavating the front surface of the retaining wall. To provide a method for building retaining walls.

[0006]

First Embodiment FIGS. 1 to 3 show an example of construction of a subsurface dam. First, as shown in FIGS. 1 and 2, a shaft 1 is excavated in a place where there is no restriction on the ground.

Next, a shield machine 2 is started in a substantially horizontal direction from a shaft 1 to a place where an underground dam is to be constructed, thereby constructing a shield 3. The shield 3 is constructed over a plurality of layers at predetermined intervals in the vertical direction.

In this embodiment, a vertically long rectangular shield machine is used, and a shield is constructed by connecting segment units made in advance in a rectangular shape to the rear thereof. It can be a machine. The excavation of the shaft 1 is performed by starting the shield 3 in order from the upper layer.
It is good to dig down gradually.

After all the shields 3 have been constructed, as shown in FIG. 3, a connecting portion 31 is constructed between the shields 3. The structure of the connecting portion 31 is a reinforced concrete structure, a PC structure,
A plain concrete structure, an SRC structure, a steel structure and the like are appropriately selected.

Then, all the connecting portions 3 between the shields 3
After constructing the concrete, a concrete is cast in the shield 3 to complete the construction of the underground dam 4.

[0011]

[Embodiment 2] FIG. 4 shows a retaining wall portion 5 for holding down the ground.
1 and a method of constructing a retaining wall 5 composed of a support bottom portion 52 which is substantially horizontally continuous with a bottom of the retaining wall body portion 51 on the ground side. In the same manner as in the first embodiment, a plurality of shields 3 in a substantially horizontal direction are arranged in parallel at intervals from the shaft to the location where the retaining wall 5 is to be constructed, and these shields 3 are integrated. (Connecting portion 31) to construct the retaining wall 5. After the construction of the retaining wall 5, excavation of the ground in front of the retaining wall 5 is performed to complete the construction.

[0012]

Embodiment 3 FIGS. 5 and 6 show Japanese Patent Application Laid-Open No. 3-187500.
The shield machine 6 is provided with a slit 62 in a part of a tail plate 61, and a protruding plate 63 formed on both sides thereof, between them. It is characterized in that a holding space 64 is formed. When propelling the shield machine 6, as shown in FIG.
Is held in the holding space 64, and the existing shield 7 is propelled as a guide.

Then, following the propulsion of the shield machine 6,
The existing shield 7 and the new shield 71 can be connected by bolts or the like. Therefore, if the above-mentioned shield machine 6 is used in the construction of the present invention, the connection step between the shields after the construction of the shield is not required, so that the construction efficiency can be improved.

[0014]

As described above, according to the present invention, by starting a shield machine from a shaft and constructing a plurality of shields in parallel, an underground structure can be constructed without being restricted by the ground. Is possible. Therefore, even when the construction conditions on the ground are bad, construction can be performed without being affected.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a shield construction process.

FIG. 2 is an explanatory view of a shield construction process.

FIG. 3 is an explanatory view of a shield connection process.

FIG. 4 is an explanatory diagram of a method of constructing a retaining wall.

FIG. 5 is an explanatory view of a shield machine.

FIG. 6 is an explanatory view of a shield machine.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Katsuhiko Mizuno Taisei Construction Co., Ltd. 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo

Claims (3)

[Claims] An underground structure wherein a plurality of shields are installed in parallel from a shaft in the ground at an interval, and the shields are integrally connected to each other. How to build. 2. A method for constructing a retaining wall comprising a retaining wall body for holding a ground and a support bottom substantially horizontally continuous on the ground side below the retaining wall, comprising: At the place where the retaining wall is to be constructed, a plurality of shields in a substantially horizontal direction are installed in parallel at intervals, and these shields are connected together to construct a retaining wall. A method of constructing a retaining wall, characterized by excavating the front. 3. A method for constructing a retaining wall comprising: a retaining wall body for holding a ground; and a support bottom which is substantially horizontally continuous with a lower ground side of the retaining wall in the ground. At the location where the retaining wall is to be constructed, a plurality of shields in a substantially horizontal direction are connected side by side while joining the shields to construct a retaining wall, and then excavating the front of the retaining wall. How to build a retaining wall.