JP2680323B2 - Construction method of underground space - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The invention of this application relates to a construction method for an underground space. More specifically, the invention of this application relates to a construction method for a deep underground space capable of forming spaces of various shapes in the ground regardless of the presence or absence of existing structures on the ground.

(Prior Art) With the progress of land use and the overcrowding of structures on the ground, the use of underground space is drawing attention.

However, conventionally, when constructing an underground space, since a continuous wall is placed from the ground into the ground and then the inside is excavated, a building already installed at a predetermined place, If there were houses, factories, etc., the underground space could only be constructed after these structures were moved, temporarily removed, or dismantled. In particular, this has been a major obstacle to the use of large-scale underground spaces in urban areas.

Such a conventional limitation for constructing an underground space has a technical reason that a construction technique for the underground is not realized to prevent the collapse of the ground (mounting) in the deep underground.

(Means for Solving the Object and Problems of the Invention) The present invention has been made in view of the above-described circumstances, and improves the drawbacks of the conventional underground space construction technology, and improves the existing structure on the ground. The purpose of the present invention is to provide a new underground space construction method that can easily construct underground spaces of various shapes with or without existence.

That is, in order to achieve the above-mentioned object, the invention of the present application is, first of all, to independently provide a plurality of pilot tunnels vertically and independently along the peripheral edge of the cavity of the underground space to be constructed. Excavate and install underground walls at the top and / or bottom of each pilot tunnel to connect them up and down, and then reinforce the roof to build the underground space from the upper part to the lower part inside the underground wall. To provide a construction method of underground space characterized by excavating.

Secondly, according to the invention of this application, a pilot tunnel connected to an approach tunnel is continuously spirally drilled up and down along a peripheral edge of a cavity of an underground space to be constructed, and an upper portion of the pilot tunnel and / Or the underground wall is provided at the bottom and connected vertically, then the roof is reinforced, and the inside of the underground wall is excavated from the upper part to the lower part in the underground space to be constructed. Provide construction method.

(Operation) In the above-mentioned construction method of the present invention, it is easy to construct the underground wall from the pilot tunnel to the cavity peripheral portion of the underground space, and the ground can be strengthened and improved. Since the underground wall can be continuously constructed deep in the ground, the inside of these underground molds can be excavated to form an underground space in a stable ground condition.

(Example) Next, the example of the construction method of the underground space of this invention is described along the attached drawing. Of course, the present invention is not limited by the following embodiments.

FIG. 1 is a sectional view in the ground showing an embodiment of the present invention. An example of a case where an existing structure (A) exists on the ground is shown.

A pilot tunnel (3) for work for excavating an approach tunnel consisting of a vertical shaft (1) and a horizontal shaft (2) which are provided with a portal in an available space on the ground such as a park (B) and connected to the horizontal shaft (2). ). In this example, a plurality of pilot tunnels (3) are excavated up and down along the peripheral edge of the space corresponding to the size of the required underground space. The upper and lower pilot tunnels (3) are also independent.

That is, a plurality of upper and lower horizontal shafts (2) connected to the vertical shaft (1) are provided, and a plurality of horizontal pilot tunnels (3) corresponding to each horizontal shaft are excavated in upper and lower layers. A multi-layer parallel tunnel type pilot tunnel (3) is excavated.

The excavation of each pilot tunnel (3) can be carried out by a shield machine or other appropriate means, but the shield construction method is particularly preferable from the viewpoint of workability.

The size of the pilot tunnel (3), the vertical pitch of the excavation, and the diameter of the peripheral portion may be appropriately determined in consideration of the size of the underground space, the state of the ground, workability, and the like. it can. The horizontal shaft (2) has a second-stage horizontal shaft (2-) at each pitch above and below the pilot tunnel (3).
2), a plurality of horizontal pits (2-n) are provided.

After excavation of each pilot tunnel (3), an underground wall (4) is continuously provided at the upper part and / or the lower part so as to connect the positions of the upper and lower pilot tunnels (3). Construction of this underground wall (4) can be carried out within the pilot tunnel (3). Next, the inner part (C) of this underground wall (4) is excavated to form an underground space.

The inner part (C) is excavated by reinforcing the roof and then digging downward from the upper part in the underground space.
In this case, the roof is reinforced by means of a ground wall, excavation after improvement of the ground by a waterworks method, and then reinforcement with concrete.

The pilot tunnel (3) may have various planar shapes. For example, as shown in FIG. 2, there are various types such as (a) circle, (b) rectangle, (c) oval, (d) square, (e) triangle, or (f) polygon. can do.

FIG. 3 shows another embodiment of the present invention, in which a pilot tunnel (3) connected to an entrance tunnel called a vertical shaft (1) and a horizontal shaft (2) is provided along the peripheral portion of the underground space. , Has been drilled in a continuous spiral up and down.

For each pitch of the spiral, the pilot tunnel (3) may be connected to the nth horizontal shaft (2-n).

And also in the case of the construction method of this example, the continuous underground wall (4) is constructed from the pilot tunnel (3) and the inside surrounded by this underground wall (4) is excavated.

For example, FIG. 4 is a longitudinal sectional view showing a state in which the underground wall (4) is constructed after excavating the pilot tunnel (3) illustrated in FIGS. 1 and 3 above. For example, the pilot tunnels (3) having a diameter of about 4 to 5 m excavated by the shield method are connected to each other by a continuous reinforced concrete underground wall (4).

In addition, the ground-side area near the ground of the pilot tunnel (3) is improved by the water stopping method or the like to form the ground-reinforced area (5). The inside of the underground wall (4) is excavated to form an underground space cavity. The diameter of this cavity can be set to, for example, 200 m or more, and the depth thereof can also be set to 50 m or more and an ultra-deep large-scale cavity.

(Effects of the Invention) According to the invention of this application, even if it is not premised on the relocation or dismantling of an existing structure, a pilot tunnel for work is excavated in multiple layers under the ground by connecting to an entrance tunnel and using a shield construction method or the like However, by constructing the underground wall that connects these pilot tunnels, it is possible to construct an underground space efficiently and while preventing the collapse of the ground.

Since it is possible to construct an underground space with various planar shapes and depths according to the ground conditions of the area to be used and the purpose of use, a great effect can be obtained for advanced use of urban space.

[Brief description of the drawings]

FIG. 1 is a sectional view in the ground showing an embodiment of the present invention. 2 (a) (b) (c) (d) (e) (f)
It is a top view which each illustrated the plane shape of a pilot tunnel. FIG. 3 is a sectional view showing still another embodiment. FIG. 4 is a partial vertical sectional view showing a peripheral portion of an underground space constructed by excavating a multi-layer pilot tunnel. 1 ... Vertical shaft, 2 ... Horizontal shaft, 3 ... Pilot tunnel, 4 ... Underground wall, 5 ... Ground reinforcement area

Claims (4)

(57) [Claims] 1. A plurality of pilot tunnels, which are connected to an approach tunnel, are independently excavated vertically along a peripheral edge of a cavity of an underground space to be constructed, and an underground wall is provided above and / or below each pilot tunnel. A construction method for an underground space, characterized in that it is provided and connected to each other vertically, then the roof is reinforced, and the inside of the underground wall is excavated from the upper part to the lower part in the underground space to be constructed. 2. A pilot tunnel connected to an approach tunnel is continuously excavated in a spiral shape vertically along a peripheral edge of a cavity of an underground space to be constructed, and an underground wall is provided at an upper portion and / or a lower portion of the pilot tunnel. A construction method for an underground space, characterized in that it is provided and connected vertically, then the roof is reinforced, and the inside of the underground wall is excavated from the upper part to the lower part in the underground space to be constructed. 3. The method for constructing an underground space according to claim 1, wherein the pilot tunnel is excavated by a shield method. 4. The method for constructing an underground space according to claim 1, 2 or 3, wherein a pilot tunnel is excavated below the existing ground structure to form an ultra-deep underground space below the existing ground structure.