JPH0485500A - Construction of excavation space - Google Patents

Abstract

PURPOSE:To make it possible to excavate a tunnel efficiently by providing a ring excavator provided with a frame having a shape corresponding to a section of an underground space to the underground space so that it is capable of moving, and constructing a pre-lining shell between the underground space wall surface and frame. CONSTITUTION:A ring excavator 7 provided with a frame 10 having a shape corresponding to a section of an underground space such as a tunnel 1, etc., is provided in the direction of excavation of the tunnel 1 so that it is capable of moving. A ring excavator 21 is provided to the frame 10 so that it is capable of moving and driving in the direction of the section of the tunnel 1 along the frame 10, and a bedrock 2 is excavated in the shape of an arc. After that, the frame 10 is moved in the direction of the excavation of the tunnel 1, concrete is placed between a tunnel wall surface 1a and the frame 10 to construct a pre-lining shell, and a bedrock core section 2b is excavated. According to the constitution, an excavation space can be efficiently constructed.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a method for constructing an excavated space suitable for use in constructing large-section tunnels, subway station areas, large underground spaces, and the like.

(b), Conventional technology Conventionally, when excavating a tunnel with low ground strength, the method is to first excavate near the upper end of the tunnel, construct a lining for that part, and then excavate sequentially toward the bottom of the tunnel. is used.

(C) 1. Problems to be solved by the invention However, in this method, since the upper end of the tunnel is excavated first, the working space is inevitably limited, and it is difficult to introduce excavating machines, making it difficult for a single person to excavate the upper end of the tunnel. There is an inconvenience in having to rely on excavation by. Further, when the tunnel has a large cross-section, it is necessary to finely add and divide the crown to prevent the ground from collapsing, which further increases the above-mentioned disadvantages.

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, the present invention aims to provide a method for constructing an underground space that can efficiently excavate an excavated space such as a tunnel with a large cross section.

(d) Means for solving 0 problems, that is, 1. The present invention allows a ring excavator (7) having a frame (10) having a shape corresponding to the underground space cross section (1) to be freely movable in the direction of excavating the underground space. A ground excavation means (21) is provided on the frame (10) so as to be movable and driveable along the frame in the cross-sectional direction of the underground space.
) while excavating the ground in an arch shape, moving the frame in the excavation direction of the underground space, and pouring concrete (29) between the underground space wall surface (1a) resulting from the excavation and the frame (10). and pre-lined shell (2
3) Construct the constructed nine pre-lined shells (2)
3) It is constructed in such a way that an underground space is constructed by excavating the inner core of the mountain (2b).

Note that the numbers in parentheses are for convenience to indicate corresponding elements in one drawing, and therefore, this description is not limited to the description on the drawing. r (e) below
The same applies to the column ``, action''.

(e) 0 effect With the above-described configuration, the present invention provides a structure in which the pre-lining shell (23) supports the rock core (2).
b) acts so that it is excavated.

(f), Example Embodiments of the present invention will be described below based on the drawings.

Fig. 1 is a cross-sectional view showing an example of a tunnel excavation site to which the present invention is applied, Fig. 2 is a cross-sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a cross-sectional view showing the construction mode of the pre-lining shell shown. It is a diagram.

As shown in FIG. 1, the excavation site of the tunnel 1 is equipped with a ring excavator 7 formed in an arch shape. The frame 10 having a frame 1o has carts 11.11 on both sides thereof, which are movable and driveable within the tunnel 1 in the directions of arrows A and B. Furthermore, the frame 10 is mounted parallel to the tunnel wall surface 1a. It has a form plate 10h formed in an arch shape. Also, on frame 10,
As shown in FIGS. 1 and 2, a guide rail 10a is laid along the cross section of the tunnel, and a rack 10b is formed in the guide rail loa along the cross section of the tunnel.

A ring traveling excavator 21 is provided on the guide rail 10a, and a nine traveling gear 21 is provided on the frame 21b of the traveling excavator 21.
a, along the guide rail 10a via 21a, the first
The frame 21b is provided with a telescopic jack 21c so that the ram 21f can be moved freely in the directions indicated by the arrows A and B in FIG. Also.

A cutter 21d is provided at the tip of the ram 21f so as to be movable in the directions of arrows A and B, which are tunnel excavation directions, and to be swingable in the direction of arrows EF by a swinging jack 21g.

Further, a pre-lining shell 23 is constructed between the frame 10 and the tunnel wall surface 1a, and the frame 1
As shown in FIG. 3, a concrete pouring pipe 10f is provided in the formwork plate 10h in the form of an injection hole Log opened on the tunnel wall side at the tip end on the face side.

The excavation site for the tunnel 1 has the above configuration, so when excavating the tunnel 1, first, as shown in FIG. Lining shell 23
After construction of the predetermined length Ll is completed, the ring traveling excavator 21 is positioned at the lowest part of the frame 10.

In this state, the ram 21f of the telescopic jack 21c is parked appropriately in the six directions of the arrows, and the cutter 21d is moved as before.
The storage state shown in FIG. 3 is changed to the excavation state shown in FIG. 2. In this state, while rotating the bit 21h at the tip of the cutter 21d, the swinging jack 21g is appropriately driven to swing the cutter 21d vertically in the figure around the pin 21i. The earth 2 is excavated over a predetermined width. Further, as the excavation progresses, the frame 21b is appropriately moved and driven in the directions of arrows C and D in FIG. 1 by the running gear 21a and the rack 10b meshed with the gear 21a via the guide rail 10a. Then, as shown in Fig. 1, the ground 2 is excavated along the tunnel excavation cross section to a width W1 and a length Ll in the tunnel excavation direction (arrow direction), and a five-arc groove 2C is formed. It is formed. In this state, use the telescopic jack 21c.
is driven to move the cutter 21d backward in the direction of arrow B into a retracted state, and at the same time move the cart 11 to move the frame 10.
Move the entire object in the direction of the arrow. Then frame 10
The edge of the formwork plate 10h and the pre-lining shell 23 that was poured and constructed just before are cut off, and the tip of the formwork plate 10h advances in the direction of the face 2a as shown in FIG. The tip of the frame plate 10h, the end portion 23a of the pre-lining shell 23 poured and constructed immediately before, and the tunnel wall surface 1a
A concrete casting space 26 having a length Ll and a width W2 is formed in the shape of a groove along the cross section of the tunnel.

In this state, the end stop 101 is attached to the tip of the face side of the formwork board 10h.
At the same time, concrete 29 is poured into the concrete placement space 26 from the injection hole log through the concrete supply pipe 10f, and a pre-lining with a length Ll is installed. A shell 23 is constructed in an arch shape in the ground 2. Note that the above-described excavation operation by the ring traveling excavator 21 is started again after the concrete placed in the concrete placement space 26 has solidified to some extent.

In this way, each time the frame 10 advances a predetermined distance L1 in the direction indicated by the arrow, the pre-lining shell 23 is cast and constructed, and the core portion 2b left in the arcuate groove 2c is excavated using heavy machinery. Build tunnel 1. At this time, the core 2b is separated from the surrounding ground 2 by the arcuate groove 2c, and the surrounding ground 2 is securely supported by the pre-lining shell 23, so the excavation work can be carried out without heavy machinery. Even if it is carried out on a large scale using this method, deformation and collapse of the ground 2 can be prevented. In addition, since the construction of the pre-lining shell 23 by the ring excavator 7 can be performed in parallel with the excavation of the core portion 2b, the excavation of the core portion 2b and the construction of the pre-lining shell 23 can be performed simultaneously. This enables construction with high efficiency. In addition, the core part 2
When the excavation b is completed, as shown in Fig. 1, the lower part of the tunnel is also excavated, and the entire cross section of the tunnel is excavated in the order of ① to ②.

In addition, although the above-mentioned embodiment described the case where the present invention is applied to tunnel excavation, the present invention is not limited to tunnel excavation, but can be applied to any case where it is necessary to excavate a large cross-section space in the ground. It can be applied to various cases such as construction of subway stations and underground spaces.

(g) 0 Detailed explanation of the invention According to the present invention, ring excavation # & 7 having a frame 10 having a shape corresponding to the cross section of an underground space such as a tunnel 1 is carried out in the excavation direction of the underground space (in the direction of arrows A and B). )
A ground excavation means such as a ring traveling excavator 21 is provided on the frame 10 so as to be movable in the cross-sectional direction of the underground space (in the direction of arrows C and D),
While excavating the earth 2 in an arch shape by the earth excavation means,
The frame is moved in the excavation direction of the underground space, and concrete 29 is poured between the frame and the underground space wall surface such as the tunnel wall surface 1a resulting from the excavation, thereby constructing the pre-lining shell 23.

Since the underground space is constructed by excavating the rock core 2b located inside the constructed pre-lining shell 23, the rock is supported by the pre-lining shell 23 at the time of excavating the core. Therefore, even when large-scale excavation is performed using heavy machinery, there is no risk of cave-ins, and tunnels with large cross sections can be excavated efficiently. In addition, since the construction work of the pre-lining shell 23 is carried out on the periphery side of the underground space cross section, and the excavation work of the rock core is carried out on the central side of the underground space cross section, conventionally, the work has been carried out alternately.
Excavation work for the face and construction work for the shoring.

It becomes possible to perform the excavation in parallel, and the construction of the excavation space can be carried out efficiently.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an example of a tunnel excavation site to which the present invention is applied, Fig. 2 is a cross-sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a cross-sectional view showing the construction mode of the pre-lining shell shown. It is a diagram. 1...Underground space (tunnel) 1a...Wall surface 2...Mound 2b...Core 7...Ring excavator O... ...Frame Yu...Ground excavation half submerged (ring traveling excavation @) 3...
...Pre-lining shell 9 ...Concrete applicant Mitsui Construction Co., Ltd. agent Patent attorney Phase 1) Shinji

Claims (1)

[Scope of Claims] A ring excavator having a frame having a shape corresponding to the cross section of the underground space is provided so as to be movable in the direction of excavating the underground space, and a rock excavation means is mounted on the frame in the direction of the cross section of the underground space. The frame is moved in the excavation direction of the underground space while excavating the earth in an arch shape by the earth excavation means, and concrete is placed between the wall surface of the underground space resulting from the excavation and the frame. A method for constructing an excavated space, comprising: constructing a pre-lining shell by pouring concrete, and excavating the core of the ground located inside the constructed pre-lining shell to construct an underground space.