JPH0758040B2 - How to construct an underground structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a method for constructing an underground structure, particularly for constructing a structure that constitutes a large space in the ground with a depth of 10 m or more underground. Is.

[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. In addition to constructing large-scale underground structures directly from the conventional ground surface, the open-cut method and caisson method occupy a large site area on the ground during the construction period, which has a large effect on neighboring areas and There are many unsuitable points in terms of environment and construction, especially in the city center and its suburbs, such as the structure obstructing the progress of construction, and a method of solving these points is 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, first, a shaft is formed by excavating the ground to a predetermined depth from the upper layer of the center of the target underground structure, and a shield method, a NATOM method, and other mountain tunnel method etc. are used as a base point from this shaft to the underground. By creating a space, the occupied land area above ground will be narrowed, the effect on the ground will be minimized, and it will be possible to construct an underground structure by avoiding the existence of existing underground structures.

A shield machine is gradually radiated downward from the vertical shaft to form a circular cylindrical shaft that serves as the shaft of the roof of the underground structure.Furthermore, the ground between adjacent shafts is horizontally leveled on the vertical shaft side. A circular tubular roof tube that forms the roof portion is formed by continuously excavating from the base end to the tip, and the roof portion is constructed.

Further, after the roof tube is formed or in parallel with the construction thereof, a side wall that is continuous in a cylindrical shape vertically downward is formed from the roof tube on the tip end side of the shaft portion as a base.

〔Example〕

 The present invention will be described below with reference to the drawings illustrating an embodiment.

First, the invention described in the first claim will be described.

The present invention is a method for constructing a roof portion R of a target underground structure B by using a vertical shaft 1 which is bored in the central portion thereof as shown in FIG.

The shaft 1 is formed by vertically excavating the ground from the upper layer of the central portion of the underground structure B. Retaining wall 1 ₀ continuous underground wall of the vertical shaft 1,
It will be constructed by column piles and steel pipe sheet piles.

As shown in FIG. 2, a shield machine 2 is provided from the side of the shaft 1.
Is radiated in a plane and is gradually excavated downward, and is lined with the segment 3 to form a cylindrical tubular shaft portion 4 serving as an axis of the roof portion R of the underground structure B.

Further, as shown in FIG. 3, the ground between adjacent shaft portions 4, 4 is horizontally excavated continuously from the base end on the vertical shaft 1 side to the tip as shown in FIG. 4 to form a roof portion R. The annular roof tube 5 is formed, and the roof portion R is formed.

The roof tube 5 has the same shield construction method as the shaft part 4,
Alternatively, a pipe roof construction method is used in which a large number of core tubes are driven into the ground and excavated while reinforcing the core tubes.

After the construction of each shaft portion 4 and roof tube 5, the inside is filled with reinforced concrete, non-reinforced concrete or the like as required.

Next, the invention described in the second claim will be described.

The present invention is a method for forming the side wall W of the underground structure B after the implementation of the first aspect of the present invention or in parallel therewith.

The side wall W is based on the roof tube 5 at the lowermost end located at the tip of the shaft portion 4 as shown in FIG. 3, and vertically downward from this as shown in FIG. 5, for example, an excavator 6 for an underground continuous wall, etc. It is excavated by and is continuously formed in a cylindrical shape in the underground wall.

After constructing the side wall W and the roof part R, as shown in FIG. 6, the entire shaft part 4 of the roof part R and the roof tube 5 are filled with concrete or the like, and the roof part R and the side wall W are continuous and integrated. Body S
Then, the ground inside the skeleton S is excavated, the soil is discharged, and the bottom slab F is formed below. Further, the internal skeleton s is constructed on the inner peripheral surface side of the skeleton S as a finish.

〔The invention's effect〕

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

[Brief description of drawings]

FIG. 1 is a plan view showing a positional relationship between a shaft and a structure according to the first aspect of the present invention, and FIG. 2 is a schematic view showing a shaft portion construction,
Fig. 3 is a schematic diagram showing the state of roof tube construction, No. 4
FIG. 5 is a schematic view showing the completed state of the roof portion, FIG. 5 is a schematic view showing the construction of the invention of the second claim, and FIG. 6 is a sectional view showing the inside of the underground structure. . B ...... underground structures, 1 ...... pit, 1 ₀ ...... earth retaining wall, 2 ...
… Shielding machine, 3… Segment, R… Roof part, 4…
... Shaft, 5 ... Roof tube, 6 ... Excavator, W ... Side wall, S ... Frame, s ... Internal 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 Yukari Ishitani 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd.

Claims (2)

[Claims] 1. A vertical shaft is formed by vertically excavating the ground from the upper layer of the central part of a target underground structure, and the vertical shaft is used as a starting point, and the shield machine is gradually radiated downward from the side surface, After constructing a circular tubular shaft that will serve as the shaft of the roof of the medium structure, the ground between each adjacent shaft is horizontally excavated continuously from the shaft end to the tip to form the roof. A method for constructing an underground structure, in which a circular tubular roof tube is formed and the roof is constructed. 2. A vertical shaft is formed by vertically excavating the ground from the upper layer of the center of a target underground structure, and the vertical shaft is used as a starting point, and the shield machine is gradually radiated downward from the side surface, After constructing a circular tubular shaft that will serve as the shaft of the roof of the medium structure, the ground between each adjacent shaft is horizontally excavated continuously from the shaft end to the tip to form the roof. A circular tubular roof tube is formed to form the roof part, and each roof tube on the tip side of the shaft part is used as a base, and a side wall that is continuous vertically downward from this base is constructed. Method.