JPH0493494A - Shield excavating machine and construction of tunnel by using shield excavating machine thereof - Google Patents

Abstract

PURPOSE:To easily construct a branched and jointed part by excavating a tunnel having a large section in the cooperation of five units of shield machines and constructing a simple circular and multiple circular tunnels by a simple circular and multiple circular tunnel shielding machines from the opposite side and joining these tunnels. CONSTITUTION:Four shield machines 3, 5, 7, and 9 having each independent excavating mechanism are arranged in rectangular form, and the fifth shield machine 11 having independent excavating mechanism is arranged in projection forwardly at the near center part, and a shielding excavating machine 1 is constituted. A multiple circularr tunnel 27 is constructed by this shielding excavating machine 1, and four units of simple circular shielding machines 29a,... are advanced from the oppoite side, and the simple circular tunnels 31a-31d are constructed. Then, the tunnel 27 and the single circular tunnels 31a-31d are joined at each front, and a branched and joined structure consisting of four lines in reciprocation of the tunnel is constructed. Accordingly, the branched and joined part of the tunnel having a large section can be constructed easily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a shield excavator suitable for excavating a large cross section and a method for constructing a tunnel using the shield excavator.

(Prior Art) Recently, shield excavators have been used to excavate underground tunnels. However, such a shield excavator is a unidirectional shield machine, and if an attempt is made to construct a road tunnel with a four-lane section using this shield excavator, the cross section will be very large, causing problems in terms of stability of the face, etc. was there.

Furthermore, in the past, tunnel branches and joints were often constructed using the oven cut method. In this construction method, earth retaining is done to match the shape of the tunnel, the inside of this is excavated from the ground, and the structure is constructed and then backfilled. However, as the depth of the tunnel increases, construction becomes difficult and costs increase. was there.

(Problems to be Solved by the Invention) As described above, it is difficult to construct a road tunnel with a four-lane section using a conventional shield excavator.
Furthermore, if the branching and joining parts of the tunnel were constructed using the oven cut method, there were problems in that construction was difficult and expensive.

The present invention has been made in view of such problems, and its purpose is to provide a shield excavator that can excavate tunnels with large cross sections such as road tunnels with four lanes in both directions. .

A second object of the present invention is to provide a tunnel construction method that can easily construct tunnel branches and joints.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the shield excavator of the present invention has four shields arranged in a rectangular shape, each having an independent excavation mechanism. and a fifth shield machine which is provided approximately at the center of the four shield machines and protrudes forward and has an independent excavation mechanism, and these five shield machines excavate together. This is a shield excavator featuring:

Further, in the tunnel construction method of the present invention, a multiple circular tunnel is constructed using the shield excavator according to claim 1, a single circular shield machine or a double circular shield machine is advanced from the opposite side, and the single circular tunnel or the double circular tunnel is This tunnel construction method constructs a double circular tunnel, and connects the multiple circular tunnel and the single circular tunnel or the double circular tunnel at a branching point of the tunnel, thereby constructing a branch structure of the tunnel.

(Function) In the shield excavator according to the first invention, five shield excavators work together to excavate a tunnel with a large cross section.

In the tunnel construction method according to the second invention, at the branch/joint part of the tunnel, a tunnel with a large cross section is excavated from one side using the above-mentioned shield excavator, and from the other side, a known single-circle shield machine or double-shield excavator is used. Depending on the machine, single circular or double circular tunnels are constructed and these are joined together, making it possible to easily construct tunnel branches and junctions even in deep places.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

1 and 2 are a front view and a side view of a shield excavator according to an embodiment of the present invention.

As shown in FIG. 1, this shield excavator 1 includes cutter face plates 13, 14, 15.
16, a first shield machine 3, a second shield machine 5, a third shield machine 7, and a fourth shield machine 9 are arranged in a rectangular shape, and a cutter face plate 17 is installed in the center of these four shield machines. A fifth shield device 11 is provided to protrude toward the front side. These five shield machines 3.5.7.9.
11 dig together as one.

In FIG. 2, 19a, 19b, 19c are mud feeding pipes that send liquid mud to the excavation surface, and 21a, 121b, 21c
is a sludge pipe that discharges excavated earth and sand.

FIG. 3 is a sectional view of a tunnel assembled at the tail section of the shield excavator 1. The lining member used for this shield tunnel consists of an arcuate segment 22, a floor slab segment 23, and a partition wall segment 25. The deck segment 23 and bulkhead segment 25 partition each tunnel and resist vertical and horizontal loads.

The shield excavator 1 excavates in the same way as a normal single-circle shield machine or double-circle shield machine, builds cement as shown in Figure 3 in the tail part, and creates a four-lane section as shown in the figure. Excavate road tunnels.

In this way, in this example, by excavating five shield machines as one unit, it is possible to excavate a tunnel with a large cross section, such as a four-lane section, by combining existing shield machines, which is an experimental cross section. can.

Next, a method of constructing a tunnel branch/junction using this shield excavator 1 will be described.

Figures 4 and 5 relate to the structure of a branch/joint part of a tunnel constructed by combining a shield excavator and a single-circle shield machine according to the present invention, and Figure 4 is a plan view of the tunnel. , FIG. 5 is a sectional view taken along line a-a in FIG. 4.

As shown in Figure 4, the shield excavator 1 is viewed from six directions in the figure.
is advanced to construct a tunnel 27 having a cross section as shown in FIG.

Also, from the direction B in the figure, four single circular shield machines 29a,
29 b (29 c, 29 d) and build single circular tunnels 31 a, 31 b, 31 c, 31 d, tunnel 27 and single circular tunnels 31 a 131 b, 31 c
, 31d will be joined head-on to construct a branching/joining structure for the four-lane round trip road tunnel.

As shown in Figure 6, the shield excavator 1 is viewed from six directions in the figure.
is advanced to construct a tunnel 27 having a cross section as shown in FIG.

Also, from the direction B in the figure, two horizontal two-day shield machines 33
a, (33b) are advanced, and the horizontal double circular tunnel 35a
, 35b, and connect the tunnel 27 and the two horizontal circular tunnels 35a and 35b head-on, thereby constructing a branching/joining structure for the four-lane road tunnel in both directions.

FIG. 6 and FIG. 7 show a shield excavator 1 according to the present invention.
6 is a plan view of the tunnel, and FIG. 7 is a sectional view taken along line bb in FIG. 6. It is.

10 and 11 relate to another branching/junction structure, FIG. 10 is a plan view of the tunnel, and FIG. 11 is a sectional view taken along line dd.

In this example, two shield excavators 1a and 1b are shifted horizontally by one lane to construct tunnels 27a and 27b. In addition, vertical double circular shield machines 41a, 41b
Accordingly, tunnels 43a and 43b are constructed. and,
Each tunnel 27a, 27b, 43a, 43b is joined face-to-face.

Incidentally, as shown in FIG. 11, the roof shield method is used in conjunction with the construction of the tunnel 27a127b.

Generally, structures such as pillars cannot be installed at the lane boundaries at branching sections such as ramps in road tunnels in order to allow vehicles to change lanes and ensure visual distance. Therefore, in this section, the tunnel lining will be constructed by combining the roof shield construction method, which has already been implemented, with this invention.

In other words, in a tunnel cross-sectional shape with a declination part as shown in Figure 3, stress concentration occurs in this part due to external pressure such as earth pressure, so the tunnel lining cannot be built structurally without pillars. . Therefore, in order to make the tunnel lining structurally viable even without pillar materials, it is necessary to make the tunnel shape as circular as possible, and after excavating the shield tunnel of the present invention in this section, the roof shield machine of the present invention is further used. The excavated parts 45a and 4 are excavated along the shield tunnel.
5b is excavated and tunnels 27a and 27b are constructed so that the tunnels 27a and 27b can withstand external pressure even without pillars.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a shield excavator capable of excavating a tunnel with a large cross section such as a road tunnel having a four-lane section. Further, it is possible to provide a tunnel construction method that allows easy construction of tunnel branches and joints.

[Brief explanation of drawings]

1 and 2 are a front view and a side view of a shield excavator according to an embodiment of the present invention, FIG. 3 is a sectional view of a tunnel excavated by the shield excavator 1, and FIG. 4 is a Figure 5 is a cross-sectional view taken along a-a in Figure 4; Figure 6 is a diagram showing the structure of another branch and junction of the tunnel; Figure 7; is a sectional view taken along b-b in Fig. 6, Fig. 8 is a diagram showing the structure of another branch/joint part of the tunnel, Fig. 9 is a sectional view taken along c-c in Fig. 8, and Fig. 10 The diagram is
FIG. 11 is a cross-sectional view taken along line dd in FIG. 10, showing the structure of another branch/joint part of the tunnel. 1... Shield excavator 3... First shield machine 5... Second shield machine 7... Third shield machine 9... Fourth shield machine 11... Fifth shield machine Roganto Toshiro Yamamoto Gandai Saei Kenko Co., Ltd. Agent Patent attorney Makoto Inoue −

Claims (2)

[Claims] (1) Four shield machines each having an independent excavation mechanism and arranged in a rectangular shape, and a shield machine installed protruding toward the front approximately in the center of the four shield machines, each having an independent excavation mechanism. A shield excavator, comprising: a fifth shield machine having a fifth shield machine, and these five shield machines dig together. (2) A multiple circular tunnel is constructed using the shield excavator according to claim 1, and a single circular shield excavator or two tunnels are constructed from the opposite side.
The tunnel is branched by advancing the double circular shield machine to construct a single circular tunnel or double circular tunnel, and joining the multiple circular tunnel and the single circular tunnel or the double circular tunnel at the branching point of the tunnel. A tunnel construction method for building a structure.