JPS5891294A - Width expanded section of tunnel and its execution method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tunnel widening section and a construction method thereof.

One method of distributing high-voltage electric wires is to use electric wire cables in tunnels installed underground.

By the way, the joint part of this cable has a larger cross section than the other cable parts, so it's a bit weird. The parts of the tunnel where the pull joints are concentrated are widened to ensure space. The construction of this widening section involved building a vertical shaft from ground level to secure the cross section of the tunnel. However, according to this construction method, there is a problem in that the construction of a shaft is severely restricted by ground conditions, such as road conditions and the work environment, and in some cases, it is not possible to construct a shaft.

The present invention solves the above problems, and embodiments thereof will be described below based on the drawings.

In FIGS. 1 and 2, a tube 1 is disposed on the inner peripheral surface of a tunnel constructed underground by a method such as a shield construction method, and this tube is made up of a plurality of segments. A plurality of electric wire cables (not shown) are inserted into the tubular body 1, and the tubular body is provided with widened portions 2 at locations corresponding to the cable joints.

To explain the specific structure of this widened portion, bent-shaped, for example, approximately semicircular vibrator roofs 3 and 3a are formed on both sides of the outer circumferential portion of the tube body 1.

Since both pipe roofs 3 and 3a have substantially the same configuration, the pipe roof 3 on the negative side (left side in FIGS. 1 and 2) will be explained, and the explanation of the vibe roof 3a on the other side will be omitted. This vibe roof 3 is made up of a plurality of pipes 4 bent into a substantially semicircular shape, which are connected over a certain distance in the axial direction of the tube body 1, and each pipe is connected to the circumferential wall of the tube body 1. It was formed by sequentially extruding from Adjacent pipes 4 are connected to each other by rails 5 and guides 6, which constitute a joint, as shown in FIG. In other words, rails 5 and guides 6 are attached to opposite sides of each pipe 4 over almost the entire length of the pipe. This guide is formed in a T-shape in this example and is slidable within the rail 5. Both ends of vibe roof 3 (upper and lower ends in Figure 1)
In order to strengthen the ground, chemical liquid injection parts 7 and 7a are provided in which chemical liquid is injected as necessary. The inside of the vibrator roof 3 communicates with the inside of the pipe body 1, and the opening of the vibrator roof is reinforced with a reinforcing member 8 such as a pillar, and may be further reinforced with a member such as a beam if necessary. Also vibe blue 3
A concrete layer 9 is provided on the inner wall surface of the tubular body 1 as well as the inner wall surface of the tube body 1, and the same is true for the other side of the vibrator roof 3a, and each inner wall surface is integrated with the concrete layer.

Note that the vibe roof does not need to be provided on both sides of the tubular body 1 as shown in the figure, and may be provided only on either the left or right side. Further, as shown in FIG. 4, a vibrating roof 3b may be provided on the upper part of the tube body 1. 4b is a pipe, and 9a is a concrete layer.

Of course, it may be provided at the lower part of the tubular body 1, or may be formed on both the upper and lower sides.

Next, the construction method will be explained.

As shown in FIGS. 1 and 5, the vibe roof 3. -33
Chemical solution injection parts 7 and 7a are provided at both ends of the construction section by injecting a chemical solution to strengthen the ground as necessary. First, as shown in Fig. 6, a jack J is installed on the floor F provided at the bottom of the pipe body 1, and then using this jack, the arc-shaped pipe 4 is moved to the negative side (left side) of the pipe body. Extrude outward from the outer periphery of the pipe and install approximately semicircular piping on the outside of the peripheral wall.

During this extrusion, a water jet may be used in combination depending on the ground. Depending on the length of the pipe 4, pipes are added to provide piping. In the same way, a plurality of pipes are successively installed adjacent to the preceding pipe 4, and the number of pipes is 7.
form 3. When pushing out the second and subsequent pipes, insert the guide 6 of the pipe 4a to be pushed out into the rail 5 of the preceding pipe 4 as shown in Figure '3, and then push this pipe out. Since it slides on the rail 5, the pipe can be extruded smoothly. Thereafter, the peripheral wall 1a (Fig. 7) of the pipe body 1 surrounded by the pipe roof 3 is removed, and the inside of the pipe roof is excavated to remove the earth and sand S as shown in Fig. 8. As a result, the inside of the maize roof 3 communicates with the inside of the tube body 1. And at the opening of vibe roof 3,
If necessary, reinforcing members such as pillars 8 may be arranged at appropriate intervals, and if it is inappropriate to provide pillars, the opening may be reinforced with beams.

In addition, after forming a vibration roof 3a on the other side (right side) of the tube body 1 in the same manner as above, the earth and sand S inside is removed,
A pillar 8 is arranged at the opening of the vibe roof.

Thereafter, a concrete layer 9 is provided on the inner circumferential surfaces of the pipe body 1 and the vibrating roof 3.3a (7) as shown in FIG. 2 to integrate the inside, and the construction is completed.

Note that the shape of the vibe roof may be, for example, a substantially semi-elliptic shape, and is not limited to a semicircular shape. Moreover, the members constituting the roof may be any bar material and do not necessarily have to be pipes, and therefore the roof is not limited to a vibrating roof. The chemical liquid injection part may be provided after the pipe 4 is continuously installed, and does not necessarily need to be installed in advance as described above. Furthermore, when extruding the pipe, if the soil is, for example, sandy, it is desirable to use a water jet in combination.

Cut tunnels are not limited to those for passing electric wires and cables, but include various tunnels for water supply, sewerage, drainage channels, waste pipes, etc.

As explained above, according to the present invention, it is possible to provide a widening section that is simple in structure and has sufficient strength, and it is possible to provide a widening section that has the necessary space in the tunnel without being affected by various ground conditions. Parts can be constructed.

[Brief explanation of drawings]

Fig. 1 is a plan view of the widened portion showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is an explanatory diagram showing the state of pipe connection, Fig. 4 The figure is a sectional view of a widened part showing another embodiment of the present invention, and FIGS. 5 to 9 are explanatory diagrams showing the construction of the widened part step by step. 1... Pipe body, 2... Widening part, 3.3a, 3b...
Pipe roof, 4, 4a, 4b...pipe, 5...
Rail, 6... Guide, 7, 7a... Chemical injection part,
8...Column, 9...Concrete layer, S...Soil. Patent applicant: Shimizu Corporation Figure 1 Figure 7 Figure 8 Figure 9

Claims (1)

[Scope of Claims] (1) A bent roof is formed at at least one location on the outer periphery of the tube and projects outward from the outer periphery,
A tunnel widening section characterized in that the inside of the roof is in communication with the inside of the pipe body. (2. In claim 1, the widened part of the tunnel is characterized in that a reinforcing member such as a pillar is provided at the opening of the roof. (3) At least one location on the outer periphery of the pipe body. First, a plurality of bent rods are successively extruded outward from the surrounding wall and piped in a bent shape to form a roof, the surrounding wall of the tube surrounded by the roof is removed, and the ground inside the roof is then removed. A method for constructing a widening section of a tunnel, which is characterized by excavating and removing earth and sand. (4) In claim 3, a chemical injection section for strengthening the ground is provided in advance at both ends of the roof construction section. A construction method for widening the tunnel.