JPH01210598A - Construction work of underground space - Google Patents

Abstract

PURPOSE:To effectively construct an underground space regardless of the presence of existing structures by a method in which a pilot tunnel is excavated connectedly to an entrance tunnel from the ground's surface, an underground wall is constructed in the ground, and the inside of the wall is excavated. CONSTITUTION:An entrance port is set in a place securing a space on the ground's surface of park B, etc., and an entrance tunnel consisting of vertical pits 1, oblique pits, and horizontal pits 2 is excavated. Pilot tunnels 3 to be connected to the entrance tunnel are then excavated. The peripheral edge of a cavity corresponding to the underground space area to be constructed above and below the tunnels 3 is excavated by shield construction method, etc., to construct underground walls 4. The inside C of the walls 4 is excavated to form an underground space.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a construction method for underground space.

More specifically, the present invention relates to a deep construction method for constructing underground spaces that can form spaces of various shapes underground, regardless of the presence or absence of existing structures above ground.

(Prior Art) With the development of land use and the increasing density of above-ground structures, the use of underground space is attracting attention.

However, conventionally, when constructing an underground space, a continuous wall is placed underground from the ground level, and then the inside of the wall is excavated. If houses, factories, etc. existed, underground space could only be constructed after these structures had been relocated, temporarily removed, or demolished. In particular, this has been a major obstacle to the use of large-scale underground spaces in urban areas.

These conventional restrictions on constructing underground spaces may be due to technical reasons, such as the fact that construction technology for underground walls to prevent rock collapse deep underground has not yet been realized.

(Objective of the Invention and Means for Solving the Problems) This invention was made in view of the above-mentioned circumstances, and it improves the shortcomings of the conventional underground space construction technology and improves the existing structure above ground. The purpose of this invention is to provide a new underground space construction method that can easily construct underground spaces of various shapes, regardless of the presence or absence of underground spaces.

In order to achieve the above object, this invention excavates a pilot tunnel connected to the approach tunnel at the periphery of the cavity of the underground space to be constructed, and provides an underground wall above and/or below the pilot tunnel. The present invention provides a method for constructing an underground space, which is characterized by excavating the inside of the cavity. Furthermore, the present invention provides a method for constructing an underground wall for constructing the above-mentioned underground space, and a shield method for excavating a pilot tunnel.

(Function) In the construction method of the present invention, an approach tunnel such as a single or multiple vertical shafts, inclined shafts, horizontal shafts, etc. is excavated in a place where ground space can be secured, such as a park, and then constructed. After excavating the periphery of the cavity corresponding to the top of the underground space using the shield method etc., an underground wall is constructed on the ground of this pilot tunnel. It is easy to do, and it is also possible to improve the ground strength of the ground.

By combining the upper and lower layers of the pilot tunnel, underground walls can be constructed continuously deep underground, and while the ground is in a stable state, the inside of these underground walls can be excavated to create an underground space.

(Example) Next, an example of the underground space construction method of the present invention will be described with reference to the attached drawings. Of course, the invention is not limited to the following examples.

FIG. 1 is a sectional view showing an embodiment of the present invention. An example is shown in which there is an existing construction 'tllJ(A) on the ground.

Excavate an approach tunnel consisting of a vertical shaft (1) and a horizontal shaft (2) with a shaft entrance in an available above-ground space such as a park (B) and connect it to the horizontal shaft (2) - Pilot for work Excavate the tunnel (3).

In this example, a pyrotechnic tunnel (3
) has been reduced by one.

These excavations can be carried out by a shield excavator or by any suitable means, but the shield 1 method is particularly preferable from the viewpoint of digging deep underground and ease of construction. It is.

The size of this pilot tunnel, the pitch of spiral excavation,
The size of the periphery can be determined appropriately taking into consideration the size of the underground space, the condition of the ground, workability, etc. In addition, the horizontal shaft (2) has a second stage horizontal shaft (2-2>), an nth stage horizontal shaft (
A plurality of them can be provided as 2-n).

After excavating the pilot tunnel (3), an underground wall (4) is continuously provided 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.

This inner part (C) can be excavated by, for example, reinforcing the ceiling plate and then digging downward from the upper part.

The pilot tunnel (3) can have various planar shapes. For example, as shown in Figure 2, (a) circular, (b) rectangular, (C) oval, (d
) square, (e) triangular, or (f) polygonal. Figure 3 shows another example, in which only one pilot tunnel (3) is excavated horizontally and then a continuous underground wall (4) is constructed, a so-called simple method. This shows how to construct an underground space using the layer tunnel method.

FIG. 4 shows yet another embodiment. In this example, a plurality of upper and lower horizontal shafts (2) connected to the vertical shaft are provided,
Horizontal pilot tunnels (3
) is excavated in multiple layers.

A multi-layer parallel tunnel type pilot tunnel (3) will be excavated.

Continuous underground wall (4) from each pilot tunnel (3)
and excavate the inside surrounded by this underground wall (4).

For example, Figure 5 is an enlarged view of the condition in which the underground wall (4) is constructed after excavating the vertically continuous or multiple pilot tunnels (3) shown in Figures 1 and 4 above. It is a diagram. For example, a pilot tunnel with a diameter of about 4 to 5 m excavated using the shield method (3
) are connected to each other by a reinforced concrete continuous underground wall (4).

In addition, the area adjacent to the ground side of the pilot tunnel (3) has been improved by water-stopping methods, etc., and has been made into a ground reinforcement area (5).The inside of the underground wall (4) has been excavated to create an underground space cavity. It has become. The diameter of this cavity can be, for example, 200 m or more, and the depth can also be a very deep and large-scale cavity of 50 m or more.

(Effect of the invention) With this invention, even without relocating or dismantling the existing structure, a pilot tunnel for work can be built in a single layer or in multiple layers underground by connecting it to the approach tunnel and using the shield method etc. By excavating and constructing underground walls,
An underground space can be constructed efficiently and while preventing the collapse of the ground.

Since it is possible to construct underground spaces with various planar shapes and depths depending on the local conditions of the area to be used and the purpose of use, a great effect can be obtained in the advanced use of urban space.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention. Figure 2 (aHb) (c) (d) (e) (f) is
FIG. 3 is a plan view illustrating the planar shape of each pilot tunnel. FIGS. 3 and 4 are sectional views each showing still another embodiment. FIG. 5 is a partial sectional view showing the peripheral part of the underground space constructed by excavating a multilayer pilot tunnel. 1...Vertical shaft 2...Horizontal shaft 3...
・Pilot tunnel 4...Underground wall 5...Ground reinforcement area agent Toshio Nishizawa, patent attorney Figure 1 Figure 2 (a) Figure 3 Figure 4 Figure 5

Claims (6)

[Claims] (1) Excavating a pilot tunnel connected to the approach tunnel at the periphery of the cavity of the underground space to be constructed, installing an underground wall above and/or below this pilot tunnel, and then excavating the inside of the cavity. An underground space construction method characterized by: (2) A plurality of pilot tunnels are excavated vertically, and the upper and lower pilot tunnels are connected by an underground wall.
1) Construction method of underground space described in section 1). (3) The method for constructing an underground space according to claim (1), wherein a vertically continuous spiral pilot tunnel is excavated and the pilot tunnels are connected by an underground wall. (4) The underground space construction method according to claim (1), (2) or (3), wherein the pilot tunnel is excavated by a shield method. (5) The method for constructing an underground space according to claim (1), wherein a pilot tunnel is excavated underground below the existing above-ground structure to form an ultra-deep underground space below the existing above-ground structure. (6) Shield construction method for constructing underground space by excavating multiple or continuous spiral pilot tunnels above and below.