JPH09195687A - Segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify structure of a segment while securing sufficient strength. SOLUTION: A frame body 2 is constituted of a skin plate 4 provided on an outer peripheral side, a main girder plate 5 arranged on a side part of the skin plate 4 and a coupler plate 6 arranged on an end part of the skin plate 4. A plural number of ribs 7 are provided with a clearance S between themselves and the skin plate 4 between the main girder plates 5 of the frame body 2. Concrete 3 is deposited in the frame body 2 including a part of the clearance S between the ribs 7 and the skin plate 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment which constitutes a tubular wall body in the axial direction of an excavation hole by connecting a plurality of mutually.

[0002]

2. Description of the Related Art As a method for constructing a tunnel, a so-called shield construction method is generally used in which segments (mainly made of concrete or steel) are assembled on the inner surface side of an excavation hole to construct a tubular wall body. As a segment used for this shield method, for example, a concrete or steel segment is known.

[0003]

By the way, 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.

[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,
A segment that forms a tubular 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 opening on the inner surface side, and is mounted in the frame body. Made of concrete and
The frame body includes a skin plate provided on the outer peripheral side, main girder plates provided on both sides of the skin plate, joint plates provided on both ends of the skin plate, and the main girder plates. A plurality of ribs provided between the ribs, and these ribs are provided with a gap between them and the inner surface of the skin plate, and the concrete is placed in the frame body including the gap. It is characterized by being.

According to a second aspect of the present invention, in the segment according to the first aspect, the ribs are attached so as to be inclined with respect to the skin plate. A third aspect of the invention is the segment of the first aspect, wherein the rib is formed in an L-shaped cross section. According to a fourth aspect of the invention, in the segment according to any one of the first to third aspects, reinforcing ribs arranged in the circumferential direction are fixed to the ribs.

A fifth aspect of the present invention is the segment of the fourth aspect, wherein the reinforcing bar is embedded in the concrete. A segment according to claim 6 is the segment according to any one of claims 1 to 5, wherein the main girder plate is provided with a projection and a hole, and the projection and the hole of the segment adjacent in the axial direction are formed. And are fitted to each other. The segment according to claim 7 is any one of claims 1 to 5.
In the segment described in paragraph 1, a bolt insertion hole through which a bolt for joining with another segment is inserted is formed in the main girder plate and the joint plate, and the bolt insertion hole communicates with the inner surface side of the frame body. It is characterized in that a bolt box is installed. The segment according to claim 8 is the segment according to any one of claims 1 to 7,
The inner surface of the frame body is coated with an adhesive that improves the adhesion of concrete. According to a ninth aspect of the invention, in the segment according to any one of the first to eighth aspects, a skin plate is provided on the inner surface side of the frame body.

[0008]

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. In FIG.
Is a segment constituting a cylindrical wall. These segments 1 are a frame body 2 made of steel plate and a frame body 2
It is a composite segment composed of concrete 3 cast inside. 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.

As shown in FIG. 2, these ribs 7 are arranged on the inner peripheral side of the main girder plate 5, and therefore a gap S is formed between these ribs 7 and the skin plate 4. There is. Then, as shown in FIG. 3, concrete 3 is cast into the frame 2 including the gap S. In addition,
An adhesive is applied to the inner surface of the frame body 2 so that it can be surely integrated with the concrete 3 that is placed in the frame body 2. 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. And these protrusions 11
By fitting the holes 1 and the holes 12, the segments 1 are positioned and the displacement in the circumferential direction is regulated.

As described above, according to the segment 1 of the above-described embodiment, the concrete 3 is cast in the gap S formed between the rib 7 of the steel frame 2 and the skin plate 4. , The cast concrete 3 can be integrated, and the strength of the segment 1 can be significantly improved by the integrated concrete 3.
Therefore, it is possible to reduce the amount of placing the concrete 3 into the frame body 2 and to reduce the cost. Furthermore, the inner surface side of the integrated concrete 3 can be reliably supported by the ribs 7, and the concrete 3 can be reliably prevented from falling off. Further, by casting the concrete 3 into the portion of the frame 2 where the ribs 7 are provided, it is possible to further improve the strength. The amount of concrete 3 placed in this portion may be adjusted according to the strength of the bedrock.

Further, since the flow of the concrete 3 is not stopped by the ribs 7 when pouring the concrete 3, as compared with the case of pouring the concrete 3 to the place partitioned by the ribs 7, The operation of placing 3 can be easily performed. Moreover, what is shown in FIG. 4 is one in which the lower end side of the rib 7 is bent, and by bending the rib 7 in this way, it is possible to improve the biteability with the placed concrete 3.

Further, what is shown in FIG. 5 is a segment 1 in which ribs 7 are attached to the skin plate 4 at an inclined angle. In this way, by angling the rib 7, the segment 1 can be reinforced in accordance with the direction of the ground pressure applied from the natural ground. Further, the number of ribs 7 to be attached may be increased or decreased according to the magnitude of the ground pressure from the natural ground. In addition, the one shown in FIG.
According to these ribs 7, since the rib 7 itself has high strength, it is possible to further reinforce the segment 1 and to cope with ground pressure from all directions.

7 and 8, the rib 7 is formed with a plurality of holes through which the reinforcing bars 13 can be inserted, and the reinforcing bars 13 are inserted into these holes and fixed by welding or the like. According to this segment 1, the strength can be significantly improved by the reinforcing bar 13, and the concrete 3 and the rib 7 can be connected to the reinforcing bar 13 by placing the concrete 3 so as to bury the reinforcing bar 13. By doing so, they can be surely integrated, and the strength can be greatly improved. In FIG. 7, reference numeral 14 is a reinforcing bar provided at a corner portion of the frame body 2.

As the reinforcing bars 13, as shown in FIG. 9, short reinforcing bars 15 are inserted into the holes of the ribs 7 and attached by welding, so that the reinforcing bars 15 are embedded in concrete. Even if 3 is cast, the concrete 3 and the rib 7 can be surely integrated. Further, as shown in FIG. 10, skin plates 4 are provided on the outer surface side and the inner surface side to surround the internal space, and the respective skin plates 4 can further improve the strength. Incidentally, reference numeral 21 in the drawing is a pouring hole formed for pouring the concrete 3 into the internal space. Further, the one shown in FIG. 11 has a bolt box 2 on the inner surface side.
2 is formed, and bolt insertion holes 23 communicating with these bolt boxes 22 are formed in the main girder plate 5 and the joint plate 6, and the bolts for joining the segments 1 are inserted into these bolt insertion holes 23. Adjacent segments 1 can be joined together. In addition,
Reference numeral 24 in the drawing is an injection hole provided for injecting the backfill material into the outer peripheral side of the constructed cylindrical wall body.

[0015]

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, it is possible to integrate the concrete cast in the gap between the rib and the skin plate, and to significantly improve the strength of the segment by the integrated concrete. And with this,
It is possible to reduce the cost by reducing the amount of concrete placed in the frame. Furthermore, the inner surface side of the integrated concrete can be reliably supported by each rib, and the concrete can be reliably prevented from falling off. Further, the strength can be further improved by placing concrete on the portion where the ribs are arranged in the frame body. As a result, it is possible to reduce the plate thickness of the constituent material and the like, and it is possible to reduce the cost.
Also, when pouring concrete, the flow of concrete is not stopped by the ribs, so concrete pouring work can be performed more easily than when pouring concrete into the areas partitioned by the ribs. be able to.

According to the second aspect of the present invention, the ribs inclined at an angle with respect to the skin plate enhance the reinforcement in the direction of the angle made at the ribs. That is, by selecting and using the segment in accordance with the direction of the ground pressure from the natural ground, it is possible to cope with the ground pressure very well. According to the segment of the third aspect, since the ribs are formed in an L-shaped cross section, it is possible to significantly improve the reinforcing strength by these ribs, and to reinforce in two directions with each one. You can

According to the segment of the fourth aspect, the rigidity of the frame body is significantly improved by the reinforcing bar fixed to the rib, and the segment having higher strength can be obtained. According to the segment of the fifth aspect, since the reinforcing bar fixed to the rib is embedded and integrated in the concrete, the strength can be further improved. Claim 6
According to the described segment, the projections formed on the main girder plates are fitted into the holes formed in the main girder plates of the adjacent segments, respectively, so that the segments are arranged in a circumferentially positioned state. can do. Claim 7
According to the described segment, by connecting the connecting bolt from the bolt box into the bolt insertion holes formed in the main girder plate and the joint plate, it is possible to extremely easily join the segments to each other. According to the segment of the eighth aspect, the frame body and the concrete are more firmly joined by the adhesive material, and the segment has higher strength. According to the segment of the ninth aspect, since the skin plate is provided not only on the outer surface side but also on the inner surface side, it is possible to further improve the strength.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of a frame 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 the embodiment of the present invention.

FIG. 4 is a sectional view of a segment for explaining the structure of the segment according to another embodiment of the present invention.

FIG. 5 is a sectional view of a segment for explaining the structure of the segment according to another embodiment of the present invention.

FIG. 6 is a sectional view of a segment for explaining the structure of the segment according to another embodiment of the present invention.

FIG. 7 is a perspective view of a segment illustrating the structure of the segment according to another embodiment of the present invention.

FIG. 8 is a sectional view of a segment for explaining the structure of the segment according to another embodiment of the present invention.

FIG. 9 is a sectional view of a segment for explaining the structure of the segment according to another embodiment of the present invention.

FIG. 10 is a perspective view of a segment for explaining the structure of the segment according to another embodiment of the present invention.

FIG. 11 is a perspective view of a segment for explaining the 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 7 rib 11 projection 12 hole 13 and 15 reinforcing bar 22 bolt box 23 bolt insertion hole S gap

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Osamu Kaji 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Corporation (72) Inventor Yoshinori Nishida 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Hide Hide Isa 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Kuniyasu 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Within the corporation

Claims (9)

[Claims] 1. A segment constituting a cylindrical wall body in an excavation hole by being connected in a circumferential direction and further connected in an axial direction, wherein the segment is formed in a box shape having an inner surface side opened. A frame body and concrete cast into the frame body. The frame body includes a skin plate provided on an outer peripheral side and main girder plates provided on both sides of the skin plate. A joint plate provided at both ends of the skin plate and a plurality of ribs provided between the main girder plates, and these ribs have a gap between the inner surface of the skin plate and the ribs. A segment characterized in that the concrete is placed in the frame body including the gap. 2. The segment according to claim 1, wherein the rib is attached so as to be inclined with respect to the skin plate. 3. The segment according to claim 1, wherein the rib has an L-shaped cross section. 4. The segment according to claim 1, wherein reinforcing ribs arranged in the circumferential direction are fixed to the ribs. 5. The segment according to claim 4, wherein the reinforcing bar is embedded in the concrete. 6. The main girder plate is formed with protrusions and holes, and the protrusions and holes of segments that are axially adjacent to each other are fitted to each other. The segment according to any one of 1. 7. The main girder plate and the joint plate are formed with bolt insertion holes through which bolts for joining with other segments are inserted, and the bolt insertion holes are formed on the inner surface side of the frame body. The segment according to any one of claims 1 to 5, wherein a communicating bolt box is provided. 8. The segment according to claim 1, wherein an adhesive material that improves the adhesion of concrete is applied to the inner surface of the frame body. 9. The segment according to claim 1, wherein a skin plate is provided on the inner surface side of the frame body.