JPH07111120B2 - How to construct an underground structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for constructing an underground structure, which constructs a structure that constitutes a large space in the ground with a large depth of 10 m or more underground. .

[Problems to be Solved by the Invention]

A plan for constructing a large-scale structure with a three-dimensional expanse in the deep underground and using it for various facilities such as research facilities is emerging as a realistic issue at present. , The conventional excavation method and caisson method for directly constructing a large-scale underground structure from the ground surface occupy a large site area on the ground during the construction period, which has a large effect on the neighboring areas and the existing underground structure. There are many unsuitable points in terms of environment and construction, especially in the city center and its suburbs, such as things that hinder the progress of construction, and methods for solving these points are desired for the realization of the plan.

The present invention has been made in view of such a background, and an object thereof is to propose a method for overcoming the weak points of the conventional method and meeting the above-mentioned demand.

[Means for Solving the Problems]

In the present invention, the ground is excavated to a predetermined depth from the outer layer of the target underground structure and the upper part of the center, and a vertical shaft for the side wall and a vertical shaft for the dome are formed, respectively, and the shield method is based on the compatible shaft, the NATOM method, By creating a space in the ground by the mountain tunnel method and other methods, the occupied land area on the ground is narrowed and the effect on the ground is minimized, and the existence of existing underground structures is avoided to avoid the underground structure. To build.

From the vertical shaft for the side wall located on the outer periphery of the underground structure, a shield machine is made into a circular arc in a plane and circulates in the ground to form an annular base for the side wall construction of the outer peripheral part of the underground structure. , A vertically continuous side wall is formed vertically downward from the base.

From the vertical shaft for the dome located in the center of the underground structure, the shield machine was excavated in a spiral shape in a plane and spirally.
A tubular dome is constructed in which circular rings having different diameters are vertically connected to form a roof portion of an underground structure.

〔Example〕

The present invention constructs a side wall W by utilizing a vertical shaft 1 for a side wall which is bored at a peripheral position of a target underground structure B, and also a vertical shaft 1 for a dome provided at a central position of the underground structure B. ′
This is a method of constructing an underground structure B by further forming a dome D that constitutes the roof portion.

The vertical shaft 1 for the side wall is formed by vertically excavating the ground from the upper layer of the outer peripheral portion of the underground structure B as shown in FIGS. 1 and 2. Retaining wall 1 ₀ continuous underground wall of the side wall for the vertical shaft 1, Hashiraretsuana,
It is constructed with steel pipe sheet piles.

From the side surface of the vertical shaft 1 for the side wall, as shown in FIG.
And circulate in the ground to form an annular base 4 for constructing the sidewall W.

Further, as shown in FIG. 4, the base 4 is vertically excavated by, for example, an excavator 5 for an underground continuous wall to form a cylindrical continuous side wall W of the underground continuous wall. Side wall W
After the construction, the hollow base 4 is filled with reinforced concrete, unreinforced concrete, or the like, if necessary.

As shown in FIG. 6, the shield machine 2 is excavated in a spiral and in a planar manner from the side surface of the dome shaft 1 ′ at the center, as shown in FIG. A tube-shaped dome D having a shape in which is connected vertically is formed.
If necessary, the adjacent rings formed by the dome D are connected to each other and restrained from each other, and the inside is filled with reinforced concrete or unreinforced concrete.

As shown in Fig. 8, the vertical shaft 1 for the side wall and the vertical shaft 1'for the dome are formed on the outer peripheral portion and the central portion of the underground structure B, respectively. As shown in Fig. 9, the vertical shafts 1, 1 ' As described above, the circular base 4 and the spiral dome D are formed, and the cylindrical side wall W is formed vertically below the base 4.

Since the level of the dome D construction end point is the same as the level of the base 4 construction start point of the side wall shaft 1, the dome D is constructed at the starting point and end point of the base 4 in the side wall shaft 1. Wrap as shown in Figure 3.

Further, as shown in FIG. 10, the base 4 and the dome D are filled with concrete or the like to construct the skeleton S in which the side wall W and the dome D are continuously integrated, and then the ground inside the skeleton S is excavated,
The soil is discharged and the bottom plate F is formed below. Further, an internal skeleton s as a finish is constructed on the inner peripheral surface side of the skeleton S.

〔The invention's effect〕

The present invention is as described above, and it is a method of forming a vertical shaft from the ground to a predetermined depth where an underground structure is constructed, and creating a space in the ground from this vertical shaft by a shield construction method. Since the area is small, existing structures will not be an obstacle, and it is possible to carry out the construction while minimizing the impact on the ground.

[Brief description of drawings]

FIG. 1 is a plan view showing the positional relationship between the vertical shaft for the side wall and the side wall,
Fig. 2 is a cross-sectional view showing the vertical shaft for the side wall, Fig. 3 is a schematic diagram showing the state of the base building, Fig. 4 is a schematic view showing the state of the lateral wall formation, and Fig. 5 is the vertical shaft and dome for the dome. 6 and 7 are schematic views showing the state of the dome construction, FIG. 8 is a plan view showing the relationship between the compatible shaft and the structure, and FIG. 9 is the construction. FIG. 10 is a schematic view showing the state, and FIG. 10 is a sectional view showing the state inside the underground structure. B ...... underground structure, 1 ...... sidewall for vertical shaft, 1 ₀ ...... earth retaining walls, 2 ...... shield machine, 3 ...... segment, 4 ...... base, W ...... sidewalls, 5 ...... excavator, 1 ′ ... Dome vertical shaft, D ... Dome, S ... Body, s ... Inner frame, F ...
... bottom plate.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 999999999 Taisei Corporation 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo (71) Applicant 999999999 Central Research Institute of Electric Power Industry 1-6 Otemachi, Chiyoda-ku, Tokyo No. 1 (71) Applicant 999999999 Hitachi Construction Machinery Co., Ltd. 2-6-2 Otemachi, Chiyoda-ku, Tokyo (71) Applicant 999999999 Fujita Co., Ltd. 4-6-115 Sendagaya, Shibuya-ku, Tokyo (71) Application Person 999999999 Komatsu Ltd. 2-3-3 Akasaka, Minato-ku, Tokyo (72) Inventor Shoji Noma 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Mitsutoshi Hokuni In Kashima Construction Co., Ltd. 1-2-7 Moto-Akasaka, Minato-ku, Tokyo (72) Inventor Kohei Sano 1-2-7 Moto-Akasaka, Minato-ku, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Takeshi Yamamoto 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Kenji Aoki 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Yuritani Ishitani, 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (56) Reference JP-A 64-43699 (JP, A)

Claims (1)

[Claims] 1. The ground is vertically excavated from the upper layers of the outer peripheral portion and the central portion of a target underground structure to form a vertical shaft for side wall and a vertical shaft for dome, respectively, and a shield machine is flattened from the side surface of the vertical shaft for side wall. To excavate in a circular arc, to circulate in the ground to create an annular base for sidewall construction of the outer periphery of the underground structure, and to make the shield machine in a plane spiral shape from the side of the dome shaft, In addition, after digging downward in a spiral shape, the tubular dome that forms the roof part of the underground structure and has different diameters that are connected vertically is formed vertically from the base for side wall construction. A method for constructing an underground structure, which comprises the step of forming a cylindrical continuous sidewall downward.