Composite segment

Abstract

To provide a composite segment that can reduce costs of steel material and machining and secure concrete fillability during casting.SOLUTION: A composite segment is constituted, in an approximate arc shape along a natural ground of a tunnel in a side view, of: a steel shell 1 that comprises girders 4, 4 arranged in a circumferential direction of the tunnel, joint plates 5, 5 arranged respectively between ends of the girders 4, 4, and a skin plate 7 arranged on an outer face side of a frame body 6 constituted of the girders 4, 4, the joint plates 5, 5; and an infilled concrete 2 cast inside the steel shell 1. Multiple shape-retaining members 8,.., are arranged between the girders 4, 4 spaced apart on a natural ground side and inner-space side of the tunnel. The shape-retaining members 8,.., arranged on the natural ground side of the tunnel are welded to the girders 4, 4 and the skin plate 7. Reinforcement flanges 9, 9 are symmetrically fitted to an inner side of the girders 4, 4. The shape-retaining members 8,.., arranged on the inner-space side of the tunnel are welded to the girders 4, 4 and the reinforcement flanges 9, 9, The shape-retaining members 8,.., are formed of angle bars or the like.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a synthetic segment used as a lining material for a shield tunnel, and in particular, it is designed to reduce steel material costs and processing costs and ensure the fillability of concrete during placement.

Background Art

[0002] The lining of a shield tunnel (hereinafter referred to as "tunnel") is generally constructed by assembling segmented lining materials called segments in the tunnel and fastening them with joints. In particular, for the lining of a tunnel that requires particularly high load-bearing capacity, a synthetic segment, which is a composite structural material of steel and concrete, is used.

[0003] As a segment used for the lining of a tunnel, a synthetic segment composed of a steel shell and the infilled concrete inside the steel shell is generally known.

[0004] The steel shell is formed into a rectangular frame shape from a pair of main girders (side plates) arranged in the circumferential direction and axial direction of the tunnel, respectively, and a pair of joint plates, and is formed into a substantially arc shape in side view along the ground of the tunnel from a skin plate arranged on the outer surface side (the ground side of the tunnel) of the frame body. In particular, the skin plate is arranged on the outer surface side of the frame body, or on both the outer surface side and the inner surface side. The former is called a five-sided steel shell synthetic segment, and the latter is called a six-sided steel shell synthetic segment.

[0005] Also, for example, in the synthetic segment disclosed in Patent Document 1, a plurality of vertical ribs are arranged between the main girders, a plurality of divels such as studs project from the inner surface of the skin plate, and reinforcing bars may be arranged in the infilled concrete.

[0006] This type of synthetic segment has the advantages that since the concrete and steel are structurally integrated, the amount of steel can be saved compared to a steel segment, and the strength is greater than that of an RC segment of the same thickness.

Prior Art Documents

Patent Document

[0007]

Patent Document 1

Patent Document 2

Disclosure of the Invention

Problems to be Solved by the Invention

[0008] However, for this type of synthetic segment, since a large amount of steel materials are used as vertical ribs and anti - displacement members, etc., the amount of steel material used and the processing man - hours are very large, and also the amount of welding is large. Therefore, there are problems such as particularly high steel material costs and processing costs, and an increase in production costs.

[0009] In addition, the inside of the steel shell is partitioned into a plurality by vertical ribs, and in addition to the vertical ribs, a large number of anti - displacement members and reinforcing bars are arranged. Therefore, there is also a problem such as a decrease in the filling property of the concrete during placement.

[0010] The present invention has been made to solve the above problems, and particularly aims to provide a synthetic segment that can reduce steel material costs and processing costs and ensure the filling property of the concrete during placement.

Means for Solving the Problems

[0011] The present invention is a synthetic segment formed along the ground of the tunnel in a substantially arc shape in side view, comprising a pair of main girders arranged in the circumferential direction of the tunnel, a pair of joint plates respectively arranged between the ends of the main girders, a steel shell composed of skin plates arranged on the outer surface side (the ground side of the tunnel) of the frame formed by the main girders and the joint plates, and backfill concrete filled in the steel shell. A plurality of shape - retaining members are arranged on the ground side and the inner space side between the main girders, and among the plurality of shape - retaining members, the shape - retaining members arranged on the ground side are welded to the main girders and the skin plates.

[0012] Among the shape retaining members, particularly the shape retaining members arranged on the ground side of the tunnel, by welding to the main girder and the skin plate, the displacement prevention effect of the infill concrete can be expected, and thereby the displacement prevention of studs etc. originally arranged in that row can be omitted and the amount of steel used can be reduced.

[0013] Also, by symmetrically attaching a pair of reinforcing flanges inside the main girder, the shape of the steel shell can be retained and the strength can be increased without hindering the filling property of the infill concrete filled inside the steel shell.

[0014] Also, among the shape retaining members, the shape retaining members arranged on the inner space side of the tunnel can be welded to the main girder and the reinforcing flange, and the shape retaining effect of the steel shell can be expected.

[0015] Also, as the shape retaining members, shaped steels such as angle bars, channel steels, H-shaped steels, or reinforcing bars such as round bars and deformed reinforcing bars can be arranged, and a plurality of lattice members can also be arranged between the shape retaining members on the ground side and the inner space side as necessary. Further, the main girder, the joint plate, and the reinforcing flange can be formed from steel plates or shaped steels etc.

[0016] Also, by arranging shape retaining members replacing the longitudinal ribs between the pair of main girders at intervals on the ground side and the inner space side of the shield tunnel, the inside of the steel shell is not partitioned by the shape retaining members, so the filling property of the concrete during placement can be ensured.

[0017] Also, it is preferable to fill the surface layer part of the infill concrete with covering concrete and arrange anti-peeling bars for the purpose of preventing peeling of the infill concrete inside the covering concrete. As the anti-peeling bars, for example, lattice reinforcing bars made of round bars or deformed reinforcing bars etc. are preferable.

Advantages of the Invention

[0018] The present invention arranges a plurality of shape-retaining members on the ground side and the inner cavity side of a tunnel between a pair of main girders. Among the shape-retaining members, the shape-retaining member arranged on the ground side of the tunnel is welded to the main girder and the skin plate arranged on the ground side of the tunnel, so that the displacement-preventing effect of the filling concrete can be expected. As a result, the displacement prevention of studs and the like originally arranged in that row can be omitted, and the amount of steel used can be reduced.

[0019] In addition, it has effects such as being able to suppress the steel material cost and processing cost by reducing the amount of steel used. Further, since a plurality of the shape-retaining members are arranged at intervals on the ground side and the inner cavity side of the tunnel, the inside of the steel shell is not partitioned, and the fillability of the concrete during placement can be ensured.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying out the Invention

[0021] FIGS. 1-4 illustrate an embodiment of a five-sided steel shell composite segment composed of a steel shell and concrete according to the present invention.

[0022] Reference numeral 1 denotes a steel shell formed in a substantially arc shape in side view along the natural ground of the tunnel, 2 denotes the filled concrete inside the steel shell 1, and reference numeral 3 denotes the covering concrete filled in the surface layer portion of the filled concrete 2.

[0023] The steel shell 1 includes a rectangular frame body (hereinafter referred to as "frame body") 6 formed in a rectangular frame shape that is long in the circumferential direction of the tunnel from a pair of main girders (side plates) 4, 4 arranged in the circumferential direction and the axial direction of the tunnel respectively and a pair of joint plates 5, 5, and a skin plate 7 arranged on the outer surface side (the natural ground side of the tunnel) of the frame body 6, and is formed in a substantially arc shape in side view that is long in the circumferential direction of the tunnel along the natural ground of the tunnel.

[0024] A plurality of shape retaining members 8,... are arranged along the axial direction of the tunnel between the main girders 4, 4, and a pair of reinforcing flanges (hereinafter referred to as "inner flanges") 9, 9 are continuously attached to the inner side surfaces of the respective main girders 4, 4 in the circumferential direction of the tunnel.

[0025] The joint plates 5, 5 are respectively welded to both ends of the main girders 4, 4 in the circumferential direction of the tunnel, and the skin plate 7 is welded to the outer surface of the frame body 6, that is, the edge portions on the natural ground side of the pair of main girders 4, 4 and the joint plates 5, 5.

[0026] Further, the main girder plates 4 and the joint plates 5 are formed of steel plates or steel sections. In particular, the main girders 4, 4 are formed in a substantially arc shape in side view that is continuous in the circumferential direction of the tunnel along the natural ground of the tunnel.

[0027] Note that the main girders 4 and the joint plates 5 are reinforced by reinforcing members (not shown in the figure) made of steel plates or steel sections as necessary. In this case, the reinforcing members may be overlapped on the outer surfaces and / or inner surfaces of the main girders 4 and the joint plates 5 respectively, or may be vertically attached in a rib shape to the inner surfaces of the main girders 4 and the joint plates 5.

[0028] The shape-retaining members 8,... are formed from section steels such as angle steels (channel steels) or grooved steels, and are arranged at intervals from each other in the diametrical direction of the tunnel between the main girders 4, 4. That is, they are located on the ground side and the inner space side of the tunnel between the main girders 4, 4 (for example, in two upper and lower stages in the height direction of the main girders 4, 4), and a plurality of them are arranged at intervals in the circumferential direction of the tunnel.

[0029] Moreover, both ends of each of the shape-retaining members 8,... are welded to the inner surfaces of the main girders 4, 4 (for example, the upper and lower edge ends of the inner surfaces). In particular, the shape-retaining members 8,... located on the ground side of the tunnel are welded to the inner surfaces of the main girders 4, 4 and the inner surfaces of the skin plates 7. Also, each of the shape-retaining members 8,... located on the inner space side of the tunnel is welded to the inner surfaces of the main girders 4, 4 and the side surfaces of the inner flanges 9, 9.

[0030] As a result, the former shape-retaining members 8,... are originally arranged in that row and have the function of the anti-shift members 10,... (described later) that exhibit the anti-shift effect of the in-fill concrete 2. Therefore, the anti-shift members 10 arranged in that row can be omitted, and the amount of steel used can be reduced. Also, the latter shape-retaining members 8,... can be expected to have the function of maintaining the shape of the steel shell 1.

[0031] Furthermore, since the shape-retaining members 8,... are arranged at intervals from each other in the diametrical direction of the tunnel, the fillability during the placement of the in-fill concrete 2 can be ensured.

[0032] The inner flanges 9, 9 are formed from steel plates or section steels, etc., and are continuously formed in a substantially arc shape in side view in the circumferential direction of the tunnel along the arc shape of the main girders 4, 4, and are welded to the inner surfaces of the main girders 4, 4. Note that the inner flanges 9, 9 may be formed integrally with the main girders 4, 4 respectively, or may be attached in a plurality of stages (for example, two stages).

[0033] The anti-shift members 10,... are provided in a plurality at predetermined intervals in the circumferential and axial directions of the tunnel on the entire inner surface of the skin plate 7. Further, the anti-shift members 10,... are stud jibs, headed studs, perforated steel plate jibs, steel section jibs, etc., and are welded to the inner surface of the skin plate 7.

[0034] These shape-retaining members 8,..., inner flanges 9, 9 and anti-shift members 10,... are completely embedded in the filled concrete 2 and integrated with the filled concrete 2, thereby forming a composite structure in the entire circumferential and axial directions of the tunnel. Further, it functions as a composite structure not only for the sectional force in the circumferential direction of the tunnel but also for the sectional force in the axial direction of the tunnel.

[0035] The filled concrete 2 has a non-reinforced structure without being particularly reinforced with reinforcing bars. Further, the covering concrete 3 is filled to a certain thickness on the surface layer portion of the filled concrete 2, and anti-peeling bars 11 for preventing the peeling of the filled concrete 2 are arranged in the covering concrete 3.

[0036] Note that reference numeral 12 is a segment joint for joining adjacent composite segments in the circumferential direction of the tunnel, and the segment joint 12 is attached to the joint plate 5.

[0037] Further, reference numeral 13 is a ring joint for joining adjacent segment rings in the axial direction of the tunnel, and the ring joint 13 is attached to the main girder 4.

Industrial Applicability

[0038] The present invention is used as a lining material for a tunnel, and in particular, it is possible to reduce the steel material cost and processing cost and ensure the fillability of concrete during placement.

Explanation of Signs

[0039] 1 Steel shell 2 Filled concrete 3 Covering concrete 4 Main girder (side plate) 5 Joint plate 6 Frame body (rectangular frame body) 7 Skin plate 8 Shape retaining member 9 Inner flange (reinforcing flange) 10 Anti-shift 11 Anti-peeling rib 12 Segment joint 13 Ring joint

Claims

1. A composite segment formed along the ground of a shield tunnel in a substantially arc shape in side view, comprising a pair of main girders arranged in the circumferential direction of the shield tunnel, a pair of joint plates respectively arranged between the ends of the main girders, a steel shell consisting of a skin plate arranged on the outer surface side of the frame formed by the main girders and the joint plates, and backfill concrete filled in the steel shell, wherein shape retaining members are arranged on the ground side and the inner cavity side between the main girders, and the shape retaining member arranged on the ground side is welded to the main girder and the skin plate.

2. The composite segment according to Claim 1, wherein reinforcing flanges are symmetrically arranged inside the pair of main girders.

3. The composite segment according to Claim 2, wherein the shape retaining member arranged on the inner cavity side of the shield tunnel is welded to the main girder and the reinforcing flange.

4. The composite segment according to any one of Claims 1 to 3, wherein the shape retaining member is formed of an angle bar, a channel steel, an H-shaped steel or a reinforcing bar.

5. The composite segment according to any one of Claims 1 to 3, wherein the main girder and the joint plate are formed of a steel plate or a section steel.

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