JPH0726877A - Construction method of underground structure - Google Patents

Abstract

PURPOSE:To construct an underground structure without excavating from an above ground part. CONSTITUTION:Shield tunnels 3a and 3b are constructed, and continuous underground walls 5a and 5b are constructed from the bottom parts of the shield tunnels 3a and 3b. A ceiling girder 7 is installed between the shield tunnels 3a and 3b. While the space surrounded by the continuous underground 5a, 5b and the ceiling girder 7 is being excavated, a support 9, a floor 11a and 11b are being installed, and an underground structure is constructed.

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.

[0002]

2. Description of the Related Art Conventionally, when constructing a large-scale structure underground, it is often the case that an underground structure is constructed by excavating from the above-ground portion.

[0003]

In this case, it is necessary to remove the structures on the ground, which is often difficult.

The present invention has been made in view of the above problems, and an object thereof is to provide a method for constructing an underground structure without constructing an excavation from the above-ground portion. Especially.

[0005]

In order to achieve the above-mentioned object, the present invention comprises a step of constructing a plurality of shield tunnels, and a step of constructing a continuous underground wall from the shield tunnels vertically downward. A method of constructing an underground structure, comprising: a step of constructing a ceiling girder between the plurality of shield tunnels; and a step of excavating a space surrounded by the continuous underground wall and the ceiling girder.

[0006]

In the present invention, a plurality of shield tunnels are constructed, a continuous underground wall is constructed vertically downward from the shield tunnel, and a ceiling girder is constructed between the plurality of shield tunnels. An underground structure is constructed by excavating the space surrounded by.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram of a method of constructing an underground structure according to the first embodiment. In FIG. 1, 1 is the ground surface and 3
a, 3b are shield tunnels, 5a, 5b are continuous underground walls, 7 is a ceiling girder, 9 is a pillar, and 11a, 11b are floors.

FIG. 2 is a perspective view of this underground structure.

Next, a method of constructing such an underground structure will be described. First, using a shield machine, shield tunnel 3
Build a, 3b. Next, this shield tunnel 3
The bottoms of a and 3b are excavated to construct continuous underground walls 5a and 5b.

FIGS. 3 and 4 are a view of the shield tunnel 3a seen from the longitudinal direction and a side view thereof when excavating below the shield tunnel 3a for constructing a continuous underground wall. 3 and 4, the shield tunnel 3
Rails 15a and 15b are provided in a. The continuous wall excavator 13 can travel on rails 15a and 15b and has a cutter 17.

The segment at the bottom of the shield tunnel 3a is removed, the continuous wall excavator 13 is stopped at that position, and the excavator 19 is excavated by the cutter 17. Then, a continuous underground wall is constructed in the excavation section 19. That is, while excavating the excavation unit 19, when muddy water is injected and excavated to a predetermined depth, the continuous wall excavator 13 is moved as shown in FIG. To do. The reinforcing bar built-in vehicle 21 has a reinforcing bar 25 built in the excavation section 19. In FIG. 5, reference numeral 23 denotes a reinforcing bar carrier, and the reinforcing bar carrier 23 is a reinforcing bar 25.
The rebar 25 is transported to the rebar erection vehicle 21 and rebuilt in the excavation section 19 while being replenished.

When the building of the reinforcing bars is completed, concrete is placed in the excavated portion 19 to construct a continuous underground wall while discharging muddy water. When constructing the continuous underground walls 5a and 5b, the groundwater level is lowered at well points or the like.

In this way, the shield tunnels 3a, 3
After constructing the continuous underground walls 5a and 5b at the bottom of b, the horizontal holes are excavated from inside the shield tunnels 3a and 3b, and the ceiling girder 7 is constructed.

FIG. 6 is an explanatory view of the construction of the ceiling girder 7.
Horizontal boring is performed from the side of the shield tunnel 3 a, and the ceiling girder 7 is constructed by rotating and press fitting while jointing the steel pipes 27.

When the continuous underground walls 5a and 5b and the ceiling girder 7 are constructed in this manner, the portion surrounded by these is excavated, and the pillars 9 and the floors 11a and 11b are successively constructed to construct an underground space. (Fig. 1). The shield tunnels 3a and 3 are used for accessing subways.

As described above, in this embodiment, after constructing the shield tunnels 3a and 3b, the continuous underground walls 5a and 5b and the ceiling girder 7 are constructed, and the space surrounded by them is excavated to construct an underground structure. Can be built. Therefore,
It is possible to safely construct underground structures such as large-scale underground roads without excavating from the ground.

FIG. 7 is an explanatory diagram of the second embodiment of the present invention. In this second embodiment, three shield tunnels 3
c, 3d, 3e are constructed, continuous underground walls 5c, 5d are constructed, and ceiling girders 7a, 7b are constructed obliquely to form an underground structure. In this way, by making the ceiling girders 7a and 7b oblique, a structure that is strong against earth pressure is obtained.

[0018]

As described above in detail, according to the present invention, an underground structure can be constructed without excavation from the above-ground portion.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a method for constructing an underground structure according to a first embodiment of the present invention.

[Fig. 2] Perspective view of underground structure

FIG. 3 is an explanatory diagram of excavation by the continuous wall excavator 13.

FIG. 4 is an explanatory diagram of excavation by the continuous wall excavator 13.

FIG. 5 is an explanatory view of inserting a reinforcing bar.

FIG. 6 is a diagram showing the construction of the ceiling girder 7.

FIG. 7 is an explanatory view of an underground structure according to the second embodiment.

[Explanation of symbols]

 1 ... Ground surface 3a, 3b, 3c, 3d, 3e ... Shield tunnels 5a, 5b, 5c, 5d ......... Continuous underground wall 7, 7a, 7b ...

Claims (3)

[Claims] 1. A step of constructing a plurality of shield tunnels, a step of constructing a continuous underground wall from the shield tunnel in a vertically downward direction, a step of constructing a ceiling girder between the plurality of shield tunnels, A method of constructing an underground structure, comprising: excavating a space surrounded by a continuous underground wall and the ceiling girder. 2. The method for constructing an underground structure according to claim 1, wherein the ceiling girder is provided in a horizontal direction. 3. The method for constructing an underground structure according to claim 1, wherein the ceiling girder is provided obliquely to the horizontal.