JPH04124400A - Method of constructing underground cave - Google Patents

Abstract

PURPOSE:To make it possible to construct an underground cave with high strength by providing continuously a succeeding tunnel wall between upper and lower preceding tunnel walls to form a circular or spiral tunnel wall, and cutting off steel segments provided in connecting sections to place concrete. CONSTITUTION:Preceding and succeeding tunnel walls 14 and 16 are formed to the lower end of side walls of a cave 10, grout 28 is injected into a grouting hole 26, and it is discharged between the peripheral surfaces of both tunnel walls 14 and 16 to secure cut-off efficiency. After that, beam members 22b and 24b of steel segments 22 and 24 for parts opposed to both tunnel walls 14 and 16 are left remaining, and the skin plates 22a and 24a are cut off. Then, excavation between the tunnel walls 14 and 16 is made, the beam members 22b and 24b of the steel segments 22 and 24 are left remaining to cut off the skin plates 22a and 24a, and the tunnel walls 14 and 16 are linked with each other. After reinforcing bars 30 are assembled, concrete is placed in the tunnel walls 14 and 16, and the cave 10 is constructed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method of constructing an underground cavity, and more particularly to a method of constructing an outer circumferential wall of a cavity using a shield excavator.

(Prior Art) Recently, in order to effectively utilize land in urban areas, it has been proposed to form large-volume cavities underground.

As a method for constructing such an underground cavity, for example, Japanese Patent Laid-Open No. 64-43699 proposes a method in which the side wall portion of the cavity is formed by a tunnel.

The method for constructing a cavity disclosed in the same issue involves excavating a curved tunnel underground in a portion corresponding to the wall of the cavity to be constructed, and reinforcing this excavated portion with concrete to form a reinforcing ring. This method involves forming a plurality of reinforcing rings adjacent to each other in the vertical direction and then excavating the interior of the reinforcing rings, but this method has the following technical problems.

(Problem to be Solved by the Invention) In other words, in the cavity construction method described in the above publication, the tunnel formed in an annular or spiral shape is filled with concrete and reinforced; Although the reinforcing rings are placed adjacent to each other, there is no integrity between them.

Therefore, there were problems in terms of water-tightness and strength of the constructed cavity.

The present invention has been made in view of these conventional problems, and its purpose is to provide a method for constructing an underground cavity that solves the problems in terms of water-tightness and strength.

(Means for Solving the Problems) In order to achieve the above object, the present invention starts a shield tunneling machine from a vertical shaft connected to the ground, and sequentially assembles segments on the rear side of the shield tunneling machine to form a circular or circular shape. In a method for constructing an underground cavity in which a spiral tunnel wall is formed and the inside of the tunnel wall is then excavated, the tunnel wall formed in an annular or spiral shape is arranged so that vertically adjacent tunnel walls are mutually connected to each other. The tunnel walls are made to communicate with each other, and then the tunnel walls are filled with concrete to connect them to each other.

The tunnel wall may include a leading tunnel wall formed at a predetermined interval in the vertical direction, and a trailing tunnel wall formed between the leading tunnel walls.

It is desirable to use steel segments that can be cut in advance for the portions of the tunnel wall that are to be communicated.

Before the trailing tunnel wall and the leading tunnel wall are made to communicate with each other, a water sealing agent or loud may be injected from inside between the outer peripheries of these tunnel walls.

(Operations and Effects of the Invention) According to the method for constructing an underground cavity having the above configuration, the tunnel walls, which are the side walls of the cavity, are interconnected by vertically adjacent ones that are filled with concrete and connected to each other. As a result, water-stopping properties are improved and its strength is also increased.

According to the structure of claim 2, since the trailing tunnel wall is formed between the leading tunnel walls, in particular, when forming the trailing tunnel wall, the leading tunnel wall is located above and below it, Tonosho's balance can be maintained.

According to the structure of claim 3, since steel segments are used in the portions that communicate between the tunnel walls, by cutting the skin plate, the tunnel walls can be easily communicated.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 and 2 show an embodiment of the method for constructing an underground cavity according to the present invention.

The construction method shown in FIG. 1 is a method of constructing a cavity 10 consisting of a dome-shaped upper wall and a cylindrical side wall integrally formed below the upper wall. A vertical shaft 12 connected to the ground is provided at the upper end of the upper wall.

In this embodiment, the upper and side walls of the cavity 10 to be constructed are spirally excavated and constructed by a shield excavator launched from a shaft 12, and as the shield excavator excavates, the rear part of the shield excavator Segments are sequentially assembled on the sides to form a tunnel-like wall.

In this case, it is predicted that near the top of the upper wall of the cavity 10, the excavation by the shield excavator will be at a steep angle, so the area near the top will not be excavated by the shield excavator, but by another means, for example, It can also be formed using conventional mountain tunnel excavation methods.

Further, in this embodiment, the tunnel wall is constructed using a pair of shield tunneling machines, and first, the leading tunnel wall 14 is formed at a predetermined interval in the vertical direction, and then the trailing tunnel wall is formed between the leading tunnel wall 14. A row tunnel wall 16 is formed.

FIG. 2 shows this state, where 18 is a segment of the leading tunnel wall 14 and 20 is a segment of the trailing tunnel wall 14.
6 segments.

Each tunnel wall 14, 16 is formed by pre-cutting steel segments 22.
24 are used alternately along the entire length, and the other parts are made of reinforced concrete, and a grout injection hole 26 is provided in the lower part thereof.

Each steel segment 22.24 has a skin plate 22a, 24a disposed on its outer periphery, a skin plate 22a,
Reinforcing beam members 22b and 24 provided on the inner surface of 24a
It is composed of b.

Leading and trailing tunnel walls 14.1 consisting of the above configurations
6 or the lower end of the side wall of the cavity 10 to be constructed, a connection process between each tunnel wall 1.4.16 is performed.

This connection process first injects grout 28 into the grout injection hole 26, discharges the grout 28 between the outer peripheries of the leading and trailing tunnel walls 14, 16, and hardens it to ensure water-tightness. be done.

Next, in the opposing portions of the leading or trailing tunnel walls 14, 16, the beam members 22b, 24 of the steel segments 22, 24 are positioned successively on the upper side along the length direction thereof.
Only the skin plates 22a and 24a are cut, leaving the skin plates 22a and 24a.

Then, the earth and sand between the tunnel walls 14 and 16 is excavated and removed, and then the girders 22b of the steel segments 22 and 24 located on the lower side of the leading or trailing tunnel walls 14 and 16,
Leaving 24b, the skin plate 22a 24a
is cut, thereby leading and trailing tunnel walls 14.1
6 will be connected.

When the leading and trailing tunnel walls 14 and 16 are brought into communication, reinforcing bars 30 are assembled so as to pass through these parts, and then concrete is filled into the tunnel walls 14 and 16, and as the concrete hardens, Once the tunnel walls 14,16 are connected, excavation within them is performed to construct the cavity 10.

According to the method for constructing an underground cavity having the above configuration, the tunnel walls 14 and 16 serving as the side walls of the cavity 10 are filled with concrete by assembling reinforcing bars 30 inside the tunnel walls 14 and 16, with the vertically adjacent walls communicating with each other. Since they are connected together, their water-stopping properties are improved and their strength is also increased.

Furthermore, after forming the preceding tunnel wall 14, the trailing tunnel wall 16 is formed between them, so especially when forming the trailing tunnel wall 16, the preceding tunnel wall 14 is located above and below it. , able to maintain Tonosho's balance.

Further, since the steel segments 22, 24 are used in the communication portion between the tunnel walls 14, 16, the skin plates 22a,
By cutting only 24a, the tunnel walls 14 and 16 can be easily and safely communicated with each other.

FIG. 3 shows another embodiment of the present invention. In this embodiment, a shaft 12a is provided on the side of a cavity 10a to be constructed, and a shield excavator launched from this shaft 12a goes around. Then return to shafts 1 and 2 a again, and go to shaft 1
2a to excavate another tunnel wall.

That is, in this embodiment, the tunnel wall is formed in an annular shape,
The tunnel walls located in the vertical direction are interconnected by the same process as in the above embodiment.

In the case of this embodiment, the upper end of the cavity 10a is formed by, for example, a conventional mountain tunnel excavation method.

The method of constructing the cavity 10a configured in this manner also provides the same effects as those of the above embodiment.

In addition, in the above embodiment, the leading and trailing tunnel walls 14
．． After forming all 16, the steel segment 22.2
Although the explanation has been made by performing the cutting work in Step 4 and the connecting work between the tunnel walls 14 and 16, for example, as shown by the imaginary lines in Fig. 1, a small tunnel for inspection is provided within each tunnel wall 14 and 16. If so, the above-described operations can be performed sequentially from the tunnel wall portion that has been formed.

[Brief explanation of drawings]

Fig. 1 is an overall view showing one embodiment of the underground cavity construction method according to the present invention, Fig. 2 is an enlarged view of the main part of Fig. 1, and Fig. 3 is an overall view showing another embodiment of the same construction method. It is a diagram. 10.10a...Cavity 12.128...Shaft 14.16...Tunnel wall 22.24...Steel segment 28... ...grout

Claims (4)

[Claims] (1) A shield tunneling machine is launched from a shaft connected to the ground, and segments are sequentially assembled on the rear side of the shield tunneling machine to form a ring-shaped or spiral tunnel wall, and then the inside of the tunnel wall is excavated. In the method for constructing an underground cavity, the tunnel walls formed in an annular or spiral shape are made to communicate with each other between vertically adjacent tunnel walls, and after that, the tunnel walls are filled with concrete to connect them to each other. A method for constructing an underground tunnel characterized by: (2) The tunnel wall includes a leading tunnel wall formed at a predetermined interval in the vertical direction, and a trailing tunnel wall formed between the leading tunnel walls. How to build underground cavities. (3) The method for constructing an underground cavity according to claim 1 or 2, wherein a steel segment that can be cut in advance is used for the portion of the tunnel wall that is to be communicated. (4) The underground according to claim 2 or 3, characterized in that before the trailing tunnel wall and the leading tunnel wall are brought into communication, a water-stop grout is injected from inside between the outer peripheries of these tunnel walls. How to build a cavity.