JPH1088984A - Segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the sufficient strength, and to simplify the structure by arranging main beam plates in a side of a skin plate provided in a peripheral side and arranging a joint plate in each end of the main beam plate so as to form a frame body, and placing concrete inside of the frame body. SOLUTION: Joint plates 6 are previously formed of a plate material made of PC concrete, and provided between each main beam plates 5. Fitting of the joint plate to the main beam plate 5 and a skin plate 4 is performed by adhesion and fixing, fitting in recessed parts and rivetting. Inserts are previously embedded in the joint plate 6, and these insert are used for fixation with bolts. A frame body is formed with plural ribs 7 between the main beam plates 5, and the plural ribs 7 are arranged in the inner peripheral side of the main beam plate 5 so as to form a clearance S between the ribs 7 and the skin plate 4 and placing concrete inside of the frame body. With this structure, plate thickness of a frame body structural member is formed thin, and the cost is lowered, and each segment can be securely connected to each other without generating a clearance in the circumferential direction.

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 holes to each other.

[0002]

2. Description of the Related Art As a method of constructing a tunnel, a so-called shield construction method in which a cylindrical wall is constructed by assembling arc-shaped segments on the inner surface side of an excavation hole is common.
As a segment used for this shield method, for example, a concrete or steel segment is known.

[0003]

In recent years, as a segment used for a tunnel or the like, a segment having a simplified structure while securing sufficient strength has been required for the purpose of cost reduction and the like. In addition, even if the structure is simplified, it is required to have a joint that can be joined with high precision without any gap.

The present invention has been made in view of the above circumstances, and has as its object to provide segments which have sufficient strength and a simple structure, and which can be connected to each other with high precision. .

[0005]

In order to achieve the above object, the segments according to claim 1 are connected circumferentially,
Further, by being connected in the axial direction, the arcuate plate-shaped segment constituting a cylindrical wall body in the excavation hole, the segment is a box-shaped frame body having an inner surface opened, The frame is composed of concrete cast into the body, the frame body, a skin plate provided on the 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, wherein the joint plate constituting the frame is made of a precast concrete plate material formed in advance. According to a second aspect of the present invention, in the segment according to the first aspect, a precast concrete rib is provided between the main girders of the frame.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the segment of the present invention will be described below with reference to the drawings. In FIG.
Is an arc-shaped segment forming a cylindrical wall.
These segments 1 are composite segments composed of a frame 2 and a concrete 3 cast inside the frame 2. The frame 2 includes a skin plate 4 provided on the outer peripheral side.
And a main girder plate 5 arranged on the side of the skin plate 4
And a joint plate 6 disposed at an end of the skin plate 4. The skin plate 4 and the main girder plate 5 are each formed of a steel plate. As the joint plate 6, a precast concrete plate material formed in advance is used, and the joint plate 6 is attached between the main girder plates 5. The joint plate 6 may be attached to the main girder plate 5 and the skin plate 4 by, for example, bonding with an adhesive, fitting to a recess formed by the main girder plate 5 and the skin plate 4, or tacking. There is something. Also,
An insert may be embedded in the joint plate 6 in advance and bolted using this insert.

[0007] The frame 2 is provided between the main girder plates 5.
A plurality of ribs 7 made of a steel plate are provided. As shown in FIG. 2, these ribs 7 are arranged on the inner peripheral side of the main girder plate 5, so that a gap S is formed between the ribs 7 and the skin plate 4. Then, as shown in FIG. 3, concrete 3 is cast into the frame 2 including the gap S. The inner surface of the frame 2 is coated with an adhesive so that the frame 2 can be reliably integrated with the concrete 3 cast in the frame 2.

The main girder plate 5 has projections 11 on its surface.
And the holes 12 are formed, and by fitting the projections 11 of the segments 1 joined to each other in the axial direction and the holes 12, the positioning of these segments 1 is performed and the displacement in the circumferential direction is reduced. It is being regulated.
Thus, according to segment 1 of the above embodiment,
As the joint plate 6 constituting the frame 2 is a precast plate material formed in advance of concrete, for example, compared with the case where the joint plate 6 is formed of a steel plate, the joint plate 6 is deformed by welding or has a material tolerance. Unaffected by distortion and therefore each segment 1
They can be reliably connected in the circumferential direction without creating a gap or the like.

The rib 7 of the frame 2 and the skin plate 4
Since the concrete 3 is cast in the gap S formed between the concrete 3 and the frame 2, the cast concrete 3 can be reliably integrated with the frame 2. Therefore, the strength of the concrete 3 can be greatly improved, and therefore, the amount of the concrete 3 to be poured into the frame 2 can be reduced, and cost can be reduced. further,
The inner surface 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. In addition,
The amount of the concrete 3 to be poured into this portion may be adjusted according to the strength of the rock.

In addition, since the flow of the concrete 3 is not stopped by the ribs 7 when the concrete 3 is cast, the concrete 3 is cast in a place completely partitioned by the ribs. The work of placing the concrete 3 can be easily performed.

The insert is embedded in the joint plate 6,
When the joint plate 6 is fixed by using this insert, a pin having a thread portion is used as the pin 11 provided on the main girder plate 5.
If the screw is attached to the insert, the joint plate 6 can be fixed and the pin 11 can be attached, so that the structure can be simplified.

FIG. 4 shows a segment 1 having another structure. This segment 1 is provided with ribs 21 made of a precast concrete plate in place of the ribs 7 made of a steel plate between the main girder plates 5, and in the case of this segment 1, the ribs 21 made of a precast concrete are used. The rib 21 is a reaction force structure for jack thrust.

As a method of constructing the tubular wall by the segment 1, first, the segment 1 is assembled to construct a tubular wall, and then the concrete 1 is filled in the segment 1 constituting the tubular wall. 3 is cast, for example, by spraying. In other words, according to such a construction procedure,
Since the concrete 3 is cast after the deformation of the skin plate 4 due to the ground load, the peeling of the filling concrete 3 from the skin plate 4 due to the deformation of the skin plate 4 is prevented.

[0014]

As described above, according to the segment of the present invention, the following effects can be obtained. A structure in which concrete is poured into the frame to ensure the strength, so that the thickness of the components of the frame can be reduced to reduce costs, and furthermore, joints that are connected to each other in the circumferential direction Since the plate is made of a preformed precast concrete plate, it is not affected by deformation due to welding or distortion due to material tolerance, for example, as compared to a case where this joint plate is formed from a steel plate. Thus, the respective segments can be reliably connected in the circumferential direction without any gap.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a segment according to an embodiment of the present invention, as viewed from the inner surface side of a cylindrical wall.

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

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

FIG. 4 is a perspective view of a frame for explaining another configuration and structure of the segment according to the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 segment 2 frame 3 concrete 4 skin plate 5 main girder plate 6 joint plate 21 rib

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hirohide Hashimoto 2-6-21, Yaesu, Chuo-ku, Tokyo Inside Ishikawajima Construction Materials Industry Co., Ltd. (72) Inventor Masanori Wakabayashi 2-6-21, Yaesu, Chuo-ku, Tokyo Ishikawajima Building Materials Industry Co., Ltd.

Claims (2)

[Claims] 1. An arcuate plate-shaped segment which is connected in the circumferential direction and further connected in the axial direction to form a cylindrical wall in an excavation hole, wherein the segment is a box having an inner surface opened. A frame formed in a mold, and concrete poured into the frame, wherein the frame includes a skin plate provided on an outer peripheral side, and main girders provided on both sides of the skin plate. A segment comprising: a plate; and joint plates provided at both ends of the skin plate, wherein the joint plate forming the frame is made of a precast concrete plate material formed in advance. 2. The frame body includes a space between the main girder plates.
2. The segment according to claim 1, wherein ribs made of precast concrete are provided.