JPH05133195A - Segment and bolt for connection thereof - Google Patents

Abstract

PURPOSE:To obtain segments, which can be assembled with high efficiency, to which only segments of the same kind may be used and by which the internal surface of a tunnel is formed in a smooth surface, and bolts for connecting the segments. CONSTITUTION:Since segments 1 are joined on mutual joining side faces in the axial direction and circumferential direction of a tunnel and a tunnel wall is formed, the segments are formed in a trapezoid with the opposed joining side faces of a tapered surface 2, in which a plane shape viewing in the radial direction of the tunnel is tapered in the axial direction, and holes 3A, 3B for bolts penetrated in the axial direction are formed. The bolt 10 for connecting the segments has a male screw section 13 at one end section of a rod in approximately the same length as segment width in the axial direction of the tunnel, and has a box nut-shaped female screw section 12 capable of being screwed with the male screw section 13 at the other end section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment for forming an inner wall of a shield tunnel and a bolt for connecting the segment.

[0002]

2. Description of the Related Art The inner wall of a shield tunnel is formed by a plurality of segments joined to each other in the axial direction and the circumferential direction of the tunnel.

Conventionally, the segment is shown in FIG. 5 of the accompanying drawings.
Like the above, the curved surface is formed into a quadrangular shape by curving in an arc shape, a plurality of recesses 51 are formed in the periphery, and a reinforcing plate 53 having bolt holes 52 is fixed to the recesses 51. It was connected by bolts to other segments adjacent in the tunnel circumferential direction and axial direction.

In a conventional shield tunnel, FIG.
After assembling a segment like a bolt with a bolt and pushing it in the direction of the tunnel axis with a shield jack, the excavator obtains propulsion force and advances one stroke corresponding to the length of one ring of the segment. After that, the excavation by the excavator is stopped and the next segment is assembled. Thus, tunnels are formed by alternately repeating excavation and assembly of segments.

[0005]

In the conventional shield work using the segment, since the excavation and the segment are performed in different steps as described above, it takes time to construct the primary lining and the tunnel is constructed. We are in a state where we cannot expect a large amount of daily progress.

Further, when a ring is formed by using the above segments, three kinds of segments of A, B and K as shown in FIG. 6 are required, which is disadvantageous in terms of cost and handling.

Further, in the segment of FIG. 5, after forming the tunnel wall surface, many recesses are exposed at the joints on the inner surface of the tunnel, so that the reinforcing plate is rusted or the inner surface of the tunnel is a smooth surface. In the case of water and sewerage tunnels, which require that, there is also the problem that a concrete lining is required as a secondary lining.

The bolt connection is carried out by utilizing the recessed space of the segment, but unless the space is enlarged to some extent, the work of inserting and tightening the bolt becomes difficult. However, if the space of the recess is increased, the cross section of the segment main body is lost, and the strength thereof is reduced.

In order to improve the inefficiency of the connection of the segments, a groove extending in the axial direction is formed at the inner edge portions at both ends in the circumferential direction of the segment, and a through hole extending in the axial edge direction is provided at the center in the circumferential direction. Thus, the segments of two adjacent rings are arranged in a zigzag manner, and the bolts having the segment width of the two rings are arranged in the groove and the through hole of the segment of one ring, and the protruding portion of the other ring is arranged. It is proposed in Japanese Utility Model Publication No. 60-32239 to arrange and connect to the through hole and the groove of the segment, respectively. However, even in this segment, even if the efficiency is slightly improved, the other problems mentioned above remain, and
There is also a new problem that the circumferential binding force is not positively generated.

The present invention solves the problems associated with such conventional segments, enables high-efficiency assembly, requires only the same type of segments to be prepared for forming the inner wall of the tunnel, and the inner wall surface of the tunnel to be smooth. The purpose is to provide a segment that forms a face.

[0011]

According to the present invention, the above object is achieved in a tunnel radial direction in a segment for forming a tunnel wall by being joined to each other at a joining side surface in the axial direction and the circumferential direction of the tunnel. This is achieved by forming a trapezoid whose planar shape as viewed has an opposing joint side surface of a tapered surface that is tapered in the axial direction, and forming a bolt hole that penetrates in the axial direction.

[0012]

In the segment of the present invention having the above-described structure, the segment which is adjacent to the already fixed segment in the tunnel circumferential direction and the axial direction is arranged with the axial direction reversed, and the segment is jacked. Press on one of the above segments.

Next, in the bolt holes of the adjacent segment,
A connecting bolt is inserted and joined with a bolt which is already fixed in the bolt hole of the one segment and whose rear end projects from the rear side of the one segment. Then, mortar is injected into the bolt hole to fix the bolt in the segment.

When the adjacent segments are pressed in the axial direction by the above-mentioned jack, the segments are tightened in that direction, and at the same time, they are also tightened in the circumferential direction by the tapered side surface.

Further, when the bolt is provided with a washer for abutting, it is possible to obtain the tightening force in the axial direction and the circumferential direction when the bolt is coupled.

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partially cutaway perspective view showing a segment and a bolt for connecting the segment according to an embodiment of the present invention. Segment 1 is curved in an arc shape in the tunnel circumferential direction,
The opposing joint side surfaces are tapered toward the axial direction A to form a tapered tapered surface 2, and the planar shape when viewed in the radial direction is trapezoidal.

Bolt holes 3 are formed in the segment 1 in parallel with each other in the axial direction at a plurality of positions keeping appropriate intervals in the circumferential direction. In the case shown in the drawing, two bolt holes 3A at the center are formed at four locations, and penetrate from one end side face 4 to the other end side face 5 in the axial direction of the segment, and the bolt holes 3B on both sides extend from the one end side face. , To the tapered surface 2. The bolt holes 3A, 3B are formed with a tapered opening 6 at one end and the other end side faces 4, 5 in the axial direction. Further, at a position slightly inside the taper opening 6, the bolt hole 3 is opened on the inner surface of the segment 1.
An injection hole 7 for injection of mortar is provided which communicates with A and 3B.

On the other hand, the connecting bolt 10 is formed to have substantially the same length as the axial direction of the segment, and has a cap nut-shaped female screw portion 12 at the front end of the rod portion 11 and is screwed to the female screw portion 12 at the rear end thereof. A possible male thread 13 is provided. Further, in this embodiment, the bolt 10 is provided with a conical washer 14 adjacent to the male screw portion 13. The washer 14 is the tapered opening 6 of the segment.
It has a slope that almost matches the taper surface of.

Reference numeral 20 denotes the male screw portion 1 of the bolt 10 described above.
It is a tool for tightening a bolt, which has a cap nut 21 screwed to 3 and a handle 22 for rotating the cap nut 21.

Next, a method of assembling the segment of this embodiment and the segment using the bolt will be described.

In the figure, reference numeral 1'denotes an existing segment, a bolt 10 'is arranged in the bolt hole 3A', and the washer 14 tightens the segment 1 '. Mortar is injected into the space in the bolt hole 3A 'through the injection hole 7'and the bolt 10' is fixed.

Next, as shown in step (A) of FIG. 2, a segment 1 to be fixed is prepared.
At that time, the segment 1 is arranged so that the axial direction thereof is opposite to that of the existing segment 1'which is adjacent to the segment 1, as shown in the development view of FIG.

The segment 1 is brought into contact with the existing segment 1 ', and the bolt 10 is inserted into the bolt holes 3A and 3B of the segment (see FIG. 2, step (B)). At this time, the segment 1 may be pressed against the existing segment 1'by a jack as in the case of the conventional segment. Next, as shown in the step (C) of FIG. 2, the bolt 10 is screwed to the bolt 10 'in the existing segment 1'by the female thread portion 12 of the tool 20 to be connected. When connecting, the tapered washer 1 of the bolt 10 is connected.
4 presses the segment 10 toward the existing segment 1 ′ at its tapered opening 6. At this time, the segment 10 also pushes the existing segment adjacent in the circumferential direction by the tapered surface 2 as can be seen in FIG. That is, not only the axial direction but also the circumferential direction is tightened. Then, the mortar is injected into the bolt holes 3A, 3B from one of the inlets 7,
It is injected until it overflows from the other injection port 7 (see step (D) in FIG. 2), and the bolt 10 is further firmly fixed. Thus, as shown in FIG. 4, as the segments are assembled, ring walls are successively formed in the tunnel.

In the present embodiment, as shown in FIG. 3, the jack is pressed against the existing segment 1'and the excavation is performed while obtaining the propulsive force as its reaction force, and at the same time, the above-mentioned segment is assembled. Can be done.

[0026]

As described above, according to the present invention, the segments are trapezoidal and are connected by bolts. Therefore, the tunnel tunnel excavation and the segment assembly can be performed at the same time.
Rapid construction is possible, and since only one type of segment is required, it is economically and handling-friendly. Furthermore, the inner surface of the tunnel is a smooth surface, eliminating the need for secondary linings. Since it does not exist, various effects can be obtained that strength can be secured.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a segment and a bolt as one embodiment of the present invention.

2 is an assembly process diagram of the segment of FIG. 1. FIG.

3 is a development view showing the arrangement of segments in the process of assembling the segments of FIG. 1. FIG.

FIG. 4 is a perspective view of the segment of FIG.

FIG. 5 is a perspective view of a conventional segment.

FIG. 6 is a front view of a ring formed using the segment of FIG.

[Explanation of symbols]

 1 segment 2 taper surface 3A, 3B bolt hole 6 taper opening 7 injection hole 10 bolt 12 female screw portion 13 male screw portion 14 washer

Claims (5)

[Claims] 1. In a segment for joining a tunnel side wall and a circumferential side surface of a tunnel to each other to form a tunnel wall, a plan view seen in the tunnel radial direction is opposed to a taper surface tapered in the axial direction. A segment that has a trapezoidal shape with joint side surfaces and is formed with bolt holes that can penetrate in the axial direction. 2. The segment according to claim 1, wherein an injection hole for injecting the mortar is formed on the inner surface side and communicates with the bolt hole. 3. The segment according to claim 1 or 2, wherein the bolt hole has a tapered opening portion that extends toward the opening side at both end portions. 4. A rod having a length substantially the same as the segment width in the tunnel axis direction has a male threaded portion at one end and a cap nut-shaped female threaded portion that can be screwed into the male threaded portion at the other end. The bolt for connecting the segment. 5. The segment connecting bolt according to claim 4, wherein the male screw portion at one end portion is provided with a washer for abutting against the taper of the bolt hole of the segment.