JPS58110795A - Widened section of width of tunnel and its execution method - Google Patents

Abstract

(57) [Abstract] 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.

For example, one method of distributing high-voltage power is via a Vζ power transmission cable installed underground in a tunnel. By the way, since the cross section of the cable joint part is larger than the cross section of the other cable parts, i+61 of the tunnel in which the cable joint part is located.
pyt is a widened part with a wide space. When constructing this widening section, the tunnel was often cut and widened to maintain 1+7 space by building a vertical shaft from ground level. However, according to this construction method, construction of a shaft is severely restricted by ground conditions, such as road conditions and the work environment, and in some cases, it may not be possible to construct a shaft commercially.

The present invention solves the above problems, and embodiments thereof will be described below with reference to the drawings.

In Fig. 1, a pipe body 1 is disposed on the inner peripheral surface of a tunnel constructed by a method such as an underground shield method.
This tube body is made up of a plurality of segments 2 . . . glued together. A plurality of power transmission cables (not shown) are inserted into the tubular body 1, and the tubular body 1 is provided with a widened portion 3 for accommodating a portion VC1 where joint portions of the cables are concentrated.

The widened portion 3 is provided with a barb in a certain section d in the axial direction of the tube body 1, and the tube body is widened on both sides as shown in FIGS. 1 and 2, and has a non-circular cross section. It is oval in shape. In the illustrated example, the widened portion 3 is composed of six segments 4° 5.6, 7, and 8.9 arranged approximately symmetrically from 6, and a reinforcing member 10.10a is opposed to the central portion of the peripheral wall. It is arranged as follows.

- The force reinforcing member 1O is held between segments 4 and 9, and the other force reinforcing member 101L is held between segments 6 and 7, respectively. Each segment can be a steel segment, a synthetic segment, a concrete segment, etc., and in this example, a steel segment is used. Segments 4 and 6 are arranged as shown in FIG.
c, 6c cover the outer surface of the reinforcing member 10.10a.

Furthermore, a concrete layer 11 is formed on the inner circumferential surface of the widened portion 3 to integrate the inside. Further, on the outer periphery of the pipe body 1 at both ends of the widened section 3, a plurality of fan-shaped end plates 12 are extruded into the ground from the peripheral wall of the widened section in order to strengthen the surrounding ground. In addition, if the ground is sandy soil, it is preferable to strengthen the ground by injecting chemicals instead of using gables.

Next, the VC construction method will be explained.

Before the construction of the widened portion shown in FIG. 4, the assembly of the segments 4 to 9 of the tube 1a in the construction section d is different from that of the segments of the tube. That is, segments 4 and 9 and segments 6 and 7 (FIG. 5) located above and below the circumferential wall of the tubular body 1a are joined to each other at the center of the tubular body. In this state, end plates 12 are previously pushed out from the inside of the tube into the ground outside and installed at both ends of the construction section d. Pipe body 1a
They may be placed around the entire outer periphery, but they may also be placed only on the right half of the circumference, as shown in FIG. Therefore, in segment 4, 5.6 of Rule 1 on the right, for example, parts of plates 4a and 5m of segment 4.5 are removed to provide windows 4d and 5b, and through these windows, the ground outside the pipe body la can be seen. dig.

After that, the windows 4d and 5b are sealed, and then, as shown in FIG. 6, a plurality of jacks 13 are installed horizontally, and both ends are brought into contact with the peripheral wall of the tubular body la. When the jack 13 is operated in this state, since the resistance on the right side of the tube body 1a is smaller than on the left side, the segments 4, 5.6 on the right side are pushed outward a certain distance m as shown in FIG. . At this time, gaps 14.14a are opened in the opposing portions of segments 4, 9.6, and 7, but the cover portions 4c,
6c covers the gap, so that the earth and sand outside the tube body 1a does not enter the tube body. In the same way, put the end plate 12k ud im L on the left side outer periphery of the pipe body, then excavate the ground outside the left side door at 8°9 through the hole, and then / Yatsuki 13... Made=t i? hand,
When the left segment is pushed outward, the tubular body 1aK is formed with a widened portion 3 having an oval cross section as shown in FIG. The reinforcing members 10 and 1 are placed between the gap portions 14 and 14a.
Fill 0a. Then, as shown in FIG. 9, the end portions 12a (FIG. 8) of the end plates 12 protruding into the widened portion 3 are cut. And a concrete layer 11 on the inner cylinder surface
is formed, and the construction is completed (in the second section, only the side of the pipe body 1a in the construction section d of the widening part is pushed out 17,
It is not necessarily necessary to widen the inside of the tube, and a widened portion may be formed.

Therefore, the cross-sectional shape of the widened part is not limited to an elliptical shape, and the objects that are inserted into the housing are not limited to power transmission cables, but can also include water and sewer pipes, voice cables, etc. Things are enshrined in order.

As described above, it is possible to provide a widened section that has a simple structure and can secure sufficient strength and space, and also allows the in-tunnel VC widened section to be formed without being influenced by various conditions on the ground.

[Brief explanation of the drawing]

μm11n shows one embodiment of the present invention, FIG. 1 is a plan view of the widened part, and FIG. 2 is an enlarged (to) r
[Phase diagram, Figure 3 is a sectional view of the segment, Figure 4 is a plan view of the pipe body before construction of the widening section, and Figures 5 to 9 Q are claim drawings showing the construction of the widening section in stages. be. 1... Pipe body, 1a... Pipe body within the widening section construction section, 2
... Segment, 3... Widening section, 4, 5, 6
,7,8゜()...segment, 4c, 6c...
Part of the cover, 4d. 5b...Window, 10.10m...Reinforcement member, 11...
- Concrete layer, 12... End board, 12a... End of end board, 13... Jacket, 14.14a... Gap, d... Widening section construction section. Above 4 births ≧ Atsushi 1 Zusuri 4 Zusen 2 Zumo 3 Zumo 5 Diagram 2 Thousand 6 Zu θ Funeral 8 Diagram 14 (L

Claims (4)

[Claims] (1) At the location where the cable joint part of the tube consisting of +71 segments is housed, a 417 with a non-circular cross section is installed.
An enlarged part of a tunnel, which is characterized by forming one width part and having reinforcing members sandwiched by segments facing each other on the peripheral wall of this wide part. (2) The widened portion of a tunnel according to claim 1, characterized in that a portion of the cover on one end side of one of the segments that clamps the segments covers the outer surface of the reinforcing member. (3) At the location where the cable joint part of the pipe body consisting of segments of Md is stored, excavate the ground outside the segment of the - side peripheral wall, push this - side peripheral wall to the outer horn, and then push it out to the outside of the other side peripheral wall. After excavating the ground on one side, the surrounding wall on the other side is extruded outward, and then inside the gap of the surrounding wall formed by this extrusion (r) Construction method. (4) The method for constructing a widening section of a tunnel as set forth in claim 3, which requires installing end plates in advance on the outer periphery of the pipe body on both sides of the widening section construction section.