JPH09242484A - Segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure strength of a segment by respectively installing reinforcing plates in end parts on the inner peripheral side of a frame body to constitute the segment. SOLUTION: A circular arc board-shaped segment 1 to constitute a cylindrical wall body in an excavating hole is composed of a box-shaped steel plate-made frame body 2 whose inner peripheral side is opened and concrete 3 placed in the frame body 2. The frame body 2 has a skin plate 4 arranged on the outer peripheral side, main girder boards 5 arranged in both side parts of the skin plate 4 and joint plates 6 arranged in both end parts of the skin plate 4, and plural ribs 7 are arranged between the mutual main girder boards 5. In the frame body 2, reinforcing plates 8 are installed in the vicinity of end parts of the main girder boards 5 and the joint plates 6 in end parts on the inner peripheral side by welding. Therefore, strength of a segment can be enhanced by the reinforcing plates.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment that forms a cylindrical wall in the axial direction of a drilled hole by connecting a plurality of pieces to each other.

[0002]

2. Description of the Related Art Generally, as a method for constructing a tunnel, a so-called shield construction method is generally used in which a plurality of arc-plate-shaped segments are assembled on the inner surface side of an excavation hole to construct a tubular wall body. As a segment used in this shield construction method, for example, one made of concrete, steel, or a combination of steel and concrete is known.

[0003]

By the way, in recent years, as a segment used for a tunnel or the like, a segment having a simplified structure while ensuring sufficient strength is required for the purpose of cost reduction and the like. As a cost reduction measure,
For example, it is conceivable to reduce the member thickness of the joint plate made of steel, but in this case, distortion due to welding during manufacturing and deformation during transportation will occur, and when the tubular wall body is assembled, there will be a gap in the joint part. As a result, the axial force or the like is concentrated on a part, and it may not be possible to secure sufficient strength.

[0004] The present invention has been made in view of the above circumstances, and has as its object to provide a segment having sufficient strength and a simple structure.

[0005]

In order to achieve the above object, the segments according to claim 1 are connected circumferentially,
By being further connected in the axial direction, the arcuate plate-shaped segment forming a tubular wall body in the excavation hole, the segment is a box-shaped frame body having an opening on the inner peripheral side, It is composed of concrete cast in a frame body, the frame body, a skin plate provided on the outer peripheral side, and a main girder plate provided on both sides of the skin plate,
It is characterized by comprising a joint plate provided at both ends of the skin plate, and an end portion on the inner peripheral side, near the end portion of the main girder plate and a reinforcing plate attached to the joint plate. . According to a second aspect of the invention, in the segment of the first aspect, a plurality of holes are formed in the reinforcing plate along the joint plate. The segment according to claim 3 is circumferentially connected,
A circular arc plate-shaped segment that forms a cylindrical wall body in the excavation hole by being further connected in the axial direction, and the segment is a box-shaped frame body having an outer peripheral side opening, and the frame. The frame body is made of concrete cast into the body, the skin plate is provided on the inner peripheral side, and the main girder plates provided on both sides of the skin plate,
It is characterized by comprising joint plates provided at both ends of the skin plate, and a reinforcing plate attached to the joint plate near the end of the main girder plate and at the outer peripheral side end.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The segments of the embodiments of the present invention will be described below with reference to the drawings. 1 and 2,
Reference numeral 1 is a segment constituting a cylindrical wall. These segments 1 are synthetic segments composed of a frame body 2 made of a steel plate and a concrete 3 cast inside the frame body 2. The frame body 2 includes a skin plate 4 provided on the outer peripheral side, a main girder plate 5 arranged on a side portion of the skin plate 4, and a joint plate 6 arranged on an end portion of the skin plate 4. A plurality of ribs 7 are provided between the main girder plates 5. Then, concrete 3 is cast inside the frame 2 to integrate the frame 2 and the concrete 3.

Further, the frame body 2 constituting this segment 1
A reinforcing plate 8 is attached to the joint girder 6 and the vicinity of the end of the main girder plate 5 by welding at the end on the inner peripheral side. A plurality of holes 9 are formed in the reinforcing plate 8 in the vicinity of the joint with the joint plate 6 along the joint plate 6. Further, the main girder plate 5 is formed with a projection 11 and a hole portion 12 on its surface so that the projection 11 and the hole portion 12 of the segments 1 which are joined in the axial direction are fitted with each other. There is. By fitting the projections 11 and the holes 12 with each other, the segments 1 are positioned and the displacement in the circumferential direction is regulated. Reference numeral 10 in FIG. 1 is an injection hole provided to inject the backfill material into the outer peripheral side of the constructed cylindrical wall body.

As described above, according to the segment 1 of the above-mentioned embodiment, since the concrete 3 is cast into the steel frame body 2 to be integrated, the strength of the segment 1 is greatly improved. be able to. Moreover, since the reinforcing plate 8 is attached to each of the end portions on the inner peripheral side of the frame body 2 constituting the segment 1, the reinforcing plate 8 is attached.
As a result, the rigidity of the segment 1 can be further increased and the strength can be further improved. Accordingly, even if the plate thickness of the constituent material of the joint plate 6 is made thin to reduce the cost, the reinforcing plate 8 can suppress the occurrence of distortion or deformation of the joint plate 6, and thereby, when assembling. Moreover, the axial force and the like can be reliably transmitted without causing a gap between the joint portions. That is, the joint plate 6
It is possible to naturally increase the strength without increasing the member thickness or increasing the concrete strength.

According to the segment 1 having the frame body 2, when the concrete 3 is placed in the frame body 2, the plurality of holes 9 formed in the reinforcing plate 8 serve as air vents. Air collects in the corners between the reinforcing plate 8 and the joint plate 6,
No space is created. That is, the high-strength segment 1 in which the concrete 3 and the reinforcing plate 8 are reliably integrated can be obtained. Further, since it is not necessary to pour the concrete 3 in consideration of air venting, the manufacturing work is not complicated.

A segment 1 shown in FIG. 3 is provided with a skin plate 4 on the inner peripheral side, and a reinforcing plate 8 is provided on each of the segments 1 on the outer peripheral side of the frame 1. It is installed. Further, also in this segment 1, the rigidity of the segment 1 is increased by the reinforcing plate 8, and the strength can be increased. When manufacturing the segment 1 having the skin plate 4 on the inner peripheral side, when the concrete 3 is placed in the frame body 2, the reinforcing plate 8 prevents the concrete 3 from overflowing from the end. Therefore, the manufacturing work can be further facilitated.

[0011]

As described above, according to the segment of the present invention, the following effects can be obtained. According to the segment of the first aspect, the rigidity of the segment can be significantly increased by the reinforcing plates attached to the end portions on the inner peripheral side of the frame body forming the segment. As a result, even if the plate thickness of the constituent material of the joint plate is reduced to reduce the cost, the reinforcing plate can suppress the occurrence of distortion and deformation of the joint plate, and thus, the joint plate can be assembled even when assembled. Axial force and the like can be reliably transmitted without causing a gap between the parts. That is, it is possible to reasonably increase the strength without increasing the member thickness of the joint plate or increasing the concrete strength. According to the segment of the second aspect, since the plurality of holes are formed in the reinforcing plate along the joint plate, when the concrete is placed in the frame body, these holes become air vents, and the joint plate and the reinforcing plate. There is no possibility that air will accumulate in the corners of and to form a space. That is, it is possible to obtain a high-strength segment in which the concrete and the reinforcing plate are reliably integrated. Further, since it is not necessary to place concrete in consideration of venting air, the manufacturing work is not complicated.

According to the third aspect of the present invention, the rigidity of the segment can be greatly increased by the reinforcing plates attached to the outer peripheral side ends of the frame body that constitutes the segment. With this, even if the plate thickness of the constituent material of the joint plate is made thin to reduce the cost,
With the reinforcing plate, it is possible to suppress the occurrence of distortion and deformation of the joint plate, and thus it is possible to reliably transmit the axial force and the like without creating a gap between the joint parts even when assembled. . That is, it is possible to reasonably increase the strength without increasing the member thickness of the joint plate or increasing the concrete strength. Further, when manufacturing a segment having a skin plate on the inner peripheral side, when concrete is placed in the frame body, the reinforcing plate can prevent concrete from overflowing from the end, and Further simplification can be achieved.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a configuration and a structure of a segment according to an embodiment of the present invention, as viewed from an inner peripheral side of a tubular wall body.

FIG. 2 is a cross-sectional view of a segment for explaining the configuration and structure of the segment according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view of a segment for explaining the configuration and structure of the segment according to another embodiment of the present invention.

[Explanation of symbols]

 1 segment 2 frame 3 concrete 4 skin plate 5 main girder plate 6 joint plate 8 reinforcing plate 9 hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Osamu Kaji 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Corporation (72) Seiichi Sato 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Corporation (72) Inventor Masuki Mori 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation Within (72) Masahiro Kobayashi 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd.

Claims (3)

[Claims] 1. An arc plate-shaped segment that forms a cylindrical wall body in an excavation hole by being connected in the circumferential direction and further connected in the axial direction, and the segment has an inner peripheral side opening. It is composed of a box-shaped frame body and concrete cast into the frame body. The frame body is provided on the outer peripheral side of the skin plate and on both sides of the skin plate. A main girder plate, joint plates provided at both ends of the skin plate, and an inner peripheral side end part near the end part of the main girder plate and a reinforcing plate attached to the joint plate. A segment characterized by: 2. The segment according to claim 1, wherein the reinforcing plate has a plurality of holes formed along the joint plate. 3. A circular arc plate-shaped segment that forms a cylindrical wall body in an excavation hole by being connected in the circumferential direction and further connected in the axial direction, wherein the segment is a box whose outer peripheral side is opened. It is composed of a frame body formed in a mold and concrete cast into the frame body. The frame body is provided with a skin plate provided on an inner peripheral side and both side portions of the skin plate. A main girder plate, joint plates provided at both ends of the skin plate, and a reinforcing plate attached to the joint plate near the end of the main girder plate at the outer peripheral side end. Segment characterized by.