JPH0613838B2 - How to build an underground structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for constructing an underground structure for constructing an outer structure of an underground structure that constitutes a large space in the ground at a large depth.

(Problems to be solved by the invention) Due to the difficulty of securing a site on the ground, a plan to construct a large-scale structure as a living space in a deep underground is becoming a reality. The applicant proposes a construction method that meets the requirements of suppressing environmental pollution such as noise and its influence on neighboring areas, and reducing the construction area occupied on the ground.

This underground structure is formed vertically from the ground, and the shield machine is dug up from the vertical shaft, which is the base of the construction start, to first create the tunnel that will become the roof part, and then construct the side wall around the tunnel to remove the earth and sand inside. Although it is constructed by discharging, the present invention is a derivative of the previously filed invention, and is intended to be proposed by adding a new method for constructing the roof portion.

(Means for Solving the Problem) In the present invention, the shield machine is inclined and advanced from the side surface of the central shaft formed in the central portion of the target underground structure,
After constructing the roof tunnel, the operation of orbiting the shield machine from the side of the roof tunnel in an arc shape at the same level is repeated sequentially with different levels, and a plurality of ring tunnels that are adjacent to each other with a distance in the depth direction. A dome-shaped roof part is constructed by forming the concentric circles in a plane.

A peripheral shaft is formed from the outer peripheral part of the underground structure, a shield machine is excavated in a plane arc shape from the side surface of the peripheral shaft to form a side wall tunnel, and the side wall tunnel is constructed vertically downward to form a side wall. Is constructed in a cylindrical shape.

The outer wall of the underground structure is constructed by this side wall and the ring tunnel.

(Example) The present invention will be described below with reference to the drawings illustrating an example.

As shown in FIGS. 1 and 2, the present invention is a vertical shaft 1 ₁ and a central shaft 1 ₂ which are formed by vertically excavating the ground from the upper layers of the outer peripheral portion and the central portion of the target underground structure B, respectively. By excavating the shield machine 2 separately, a side wall tunnel 3 and a roof tunnel 4 are formed, and by excavating the side wall excavator 7 and the ring tunnel shield machine 2 from these tunnels 3, 4, underground This is a method of constructing the structure B.

The outer peripheral shafts 1 ₁ and the central vertical shaft 1 ₂ drilled stabilize the ground vertically while realizing manner in the pore walls of the construction of the underground continuous wall as shown in FIG. 3 -I, insertion of rebar cage, concrete hitting It is built by setting.

The lower end of the outer peripheral vertical shaft 1 ₁ from the roof R is constructed without a dome-like configuration as shown is drilled deeper than the lower end position of the central vertical shaft 1 _2.

From the outer peripheral shafts 1 ₁ and the central vertical shaft 1 ₂ sides, respectively sidewall W constructed by excavation of the shield machine 2, as shown in FIG. 1,
A side wall tunnel 3 and a roof tunnel 4 which are bases for constructing the roof R are constructed.

The tunnel 3 for the side wall is formed by digging the shield machine 2 from the outer shaft 1 ₁ to the top end position of the building where the side wall W is to be formed in an arc shape in a plane, and circling it.
It is formed by digging at an angle from 1 ₂ .

The shield machine 2 when constructing the sidewall tunnel 3 is shown in Figs.
In the space of the outer vertical shaft 1 ₁ of the underground construction B as shown in FIG. -II, inserted horizontally pipe natural ground while boring, injecting cement milk to the inside and outside, it is formed by a pipe roof method or the like It is starting from Ruyokoana 1 _3.

Adit 1 ₃ after completion, here established the shield machine 2, while lining segment 5 is excavation horizontally, side walls tunnel 3 is constructed in a ring shape. The segment 5 has a guide wall 5a for constructing the side wall W from inside the side wall tunnel 3.

Roof tunnel 4 the first view, the shield machine 2 is inclined from the side of the central vertical shaft 1 ₁ lower end position as shown in Figure 2 is starting, the plane in part arcuate by reach Adit 1 ₃ In addition, it is constructed to be inclined vertically.

From the lower end of the roof tunnel 4 directly above the side wall tunnel 3, as shown in FIGS. 4A and 4B, which shows the state of the shield machine 2 starting from the bottom, the shield machine 2 is moved horizontally as in the construction of the side wall tunnel 3. The ring-shaped ring tunnel 6 is formed by excavating the same and making a circular arc in a plane at the same level.

Subsequently, the shield machine 2 is raised to a level higher than that of the prefabricated ring tunnel 6 as described later, and the shield machine 2 is circulated in an arc shape having a diameter smaller than that of the prefabricated ring tunnel 6 on the lower stage side. By constructing adjacent ring tunnels 6 and 6, and successively repeating this work with a level difference sequentially, as shown in the drawing, they are adjacent to each other at a distance in the depth direction, and the upper side has a small diameter. A concentric dome-shaped roof portion R is constructed. FIG. 5 is a partially enlarged view of FIG. 4-I.

FIG. 6 shows the movement state of the shield machine 2 in the roof tunnel 4 when the ring tunnel 6 is constructed. The outline of the movement of the shield machine 2 will be described with reference to this figure.

While the shield machine 2 from the center shafts 1 ₂ incorporated in starter 2a for shielding device 2 to set it to a predetermined start position as I showing the manner in which lowering to the lower end of the roof tunnel 4 It is connected to an elevating device 2c having an elevating jack 2b, suspended on both sides by a reaction force, and the elevating device 2c is expanded and contracted by the elevating jack 2b to descend in a lengthy scale.

When the elevating device 2c descends to the lower end of the roof tunnel 4, the shield machine 2 is separated from the starting device 2a and made to travel one round (II).

After the shield machine 2 is circulated and returned, the shield machine 2 is mounted on the starting device 2a again and is raised by the elevating jack 2b by one step (III).

Then circulate at this level in the same way as II (IV).

The above operations I to IV are repeated up to the upper end of the roof tunnel 4 to construct the dome-shaped roof portion R.

After the roof R is constructed, the sidewall W is constructed from the sidewall tunnel 3 in the same manner as an underground continuous wall is constructed.

The side wall W is constructed by excavating mud with the excavator 7 installed on the guide wall 5a of the segment 5 as shown in FIG. 7, and after finishing the excavation, inserting the rebar cage 8 while replacing the mud with concrete. .

After the construction of the roof part R and the side wall W is completed, the earth and sand surrounded by this is excavated, and the excavated earth and sand is excavated by the peripheral shaft 1 ₁ and the central shaft 1 ₂
The soil is further removed, and as shown in FIG. 2, the bottom slab F is constructed in an inverted arch shape at the lower end position of the side wall W to complete the underground structure B of the pillarless space.

(Effects of the Invention) The present invention is as described above, and a roof tunnel for constructing a roof portion is constructed from a central vertical shaft formed vertically below the central portion of a targeted underground structure, and a shield tunnel is formed using this as a base. The machine is excavated in an arc shape at the same level, and a plurality of ring tunnels are formed in a dome shape by changing the diameter in the depth direction to form a roof part and side wall tunnels formed from outer peripheral shafts. Since the construction area occupying the ground is only the coexisting pit, the construction can be performed while suppressing the influence on the ground.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a construction situation of the present invention, FIG. 2 is a longitudinal sectional view thereof, and FIGS. 3 -I and II show construction of a shaft and a side shaft, respectively. Fig. 4-I, II are sectional views showing the construction of the ring tunnel, Fig. 5 is a partially enlarged view of Fig. 4, and Figs. 6-I-IV are inside the roof tunnel. FIG. 7 is a sectional view showing how the shield machine is moved, and FIG. 7 is a sectional view showing how the side wall is constructed. B: underground structure, R: roof, W: side wall, F:
Bottom plate, 1 ₁ …… Outer shaft, 1 ₂ …… Central shaft, 1 ₃ …… Horizontal shaft,
2 ... Shielding machine, 2a ... Starting device, 2b ... Lifting jack, 2c ... Lifting device, 3 ... Side wall tunnel, 4
...... Roof tunnel, 5 …… segment, 5a …… Guide wall, 6 …… Ring tunnel, 7 …… Excavator, 8
…… Reinforcing cage.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 999999999 Komatsu Ltd. 2-3-6 Akasaka, Minato-ku, Tokyo (71) Applicant 999999999 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Corporation ( 71) Applicant 999999999 Taisei Corporation 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo (71) Applicant 999999999 Central Research Institute of Electric Power Industry 1-16-1 Otemachi, Chiyoda-ku, Tokyo (71) Applicant 999999999 Fujita Co., Ltd. 4-6-15 Sendagaya, Shibuya-ku, Tokyo (72) Inventor Shoji Noma 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Masao Matsuyama Tokyo Port Moto Akasaka 1-2-7 Kashima Construction Co., Ltd. (72) Inventor Yasuo Mori 650 Kandamachi, Tsuchiura City, Ibaraki Prefecture Hitachi Construction Machinery Co., Ltd. Tsuchiura Plant (72) Akito Ishikawa Yasuaki Ishikawa 650 Kazunachi-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd.Tsuchiura factory (72) Inventor Hidetsugu Yamazaki 650 Kintachi-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd.Tsuchiura factory (72) Inventor Nobuyuki Maehara 2-6-2, Otemachi, Chiyoda-ku, Tokyo Within Hiritsu Construction Machinery Co., Ltd. (56) Reference JP-A 64-43699 (JP, A) JP-A 1-315600 (JP, A) JP Flat 2-108799 (JP, A) JP-A-2-157399 (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 an outer peripheral shaft and a central shaft, respectively, and a shield machine is planarly arc-shaped from the side surface of the outer peripheral shaft. The tunnels for the side walls are made to circulate in the direction of the central shaft, and the tunnels are excavated from the side surface of the central shaft to the tunnel for the side walls while inclining the shield machine to form the roof tunnels. In addition to the above, the work of rotating the shield machine in an arc shape from the side of the roof tunnel in the same level is repeated with different levels in sequence, and a plurality of roof parts are formed adjacent to each other at a distance in the depth direction. Method for constructing an underground structure, in which the ring tunnels are formed concentrically on a plane to construct the outer structure of the underground structure.