JP2007270485A - Composite segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite segment which is small in steel usage, low in cost, thin in thickness, high in strength, and can have a wider width. <P>SOLUTION: The synthetic segment 1 is formed like an arcuate slab by filling concrete 3 into a gap between a pair of steel skin plates 2a, 2b arranged on two surfaces on a natural ground side and the inner space side of a tunnel. The skin plates 2a, 2b are provided with arcuate joint plates (inter-ring joint plates) 4a, 4b, linear joint plates, and a plurality of dowels 6. The arcuate joint plates 4a or 4b have their base ends fixed along tunnel axial edges of the skin plate 2a or 2b and their tips extended toward the skin plate 2b or 2a opposed to the same. The linear joint plates have their base ends fixed along tunnel circumferential edges of the skin plate 2a or 2b and their tips extended toward the skin plate 2b or 2a opposed to the same. The dowels 6 are fixed to the skin plates 2a or 2b and protruded to the skin plates 2b or 2a opposed to the same. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention forms a cylindrical wall body by filling concrete inside the skin plate on the natural ground side and the inner air side of the tunnel to form a circular arc plate shape, and by connecting a plurality in the circumferential direction and the axial direction of the tunnel To a synthetic segment.

Conventionally, in a shield method of forming a tunnel by excavating a drill hole in a natural ground and constructing a cylindrical wall body by connecting a plurality of arc-shaped segments on the inner surface in the circumferential direction and the axial direction, It is known from, for example, Patent Document 1 and Patent Document 2 that a synthetic segment manufactured by filling concrete in a circular arc frame (steel shell) is used.
The synthetic segment described in the above-mentioned Patent Document 1 is formed of a curved main girder plate and a flat joint plate made of U-shaped steel plates in cross-sectional view, and these are coupled to the skin plate to face the skin plate. A box-shaped steel shell having an opening on the side is provided.
Further, the composite segment described in Patent Document 2 is formed in an arc-shaped box shape having an opening on the opposite side of the skin plate by connecting a main girder plate having a U-shaped cross section, a joint plate, and a skin plate. In addition, a steel shell having a configuration in which a plurality of substantially H-shaped stoppers are disposed between the two main girders is provided.

By the way, when constructing road tunnels where demand is expected to increase in the future, it is required to reduce the cost of the construction as a whole. Shortening is required. In order to realize such a requirement, it is necessary to make the girder height of the road tunnel lower than before, and the segment constituting the wall surface of the tunnel is required to be thin and have high strength.
JP 11-159293 A JP 2003-27894 A

However, although the synthetic segment described in Patent Document 1 can manufacture a thin and high-strength one at a lower cost than a steel segment, it is configured to cover the entire surface of the main girder surface and the joint surface with a steel plate. The amount of steel used in the process is large, the weight is large, and it is difficult to handle, and the manufacturing cost increases. Moreover, since the synthetic segment of patent document 2 covers all the circumference | surroundings other than an opening part with steel materials, and several shift stoppers are arrange | positioned between main girder plates, even if intensity | strength can be satisfied, it is one layer of steel materials. The amount used is increased, handling is poor, and it is difficult to meet the demand for cost reduction.
Therefore, the inventors of the present application, according to the prior Japanese Patent Application No. 2004-207350 application and Japanese Patent Application No. 2005-69020 application, are substantially arc-shaped respectively on the two opposing sides of the outer peripheral surface and the inner peripheral surface constituting the steel shell. The first steel material and the second steel material each having a substantially L-shaped cross section or a quadrangular cross section that are curved to each other are arranged opposite to each other, and both ends of the pair of first steel materials are connected to each other. As a structure connected by a joint member, the amount of steel material used in the steel shell is reduced, and a synthetic segment that is low in cost and high in strength even in a thin-walled structure has been proposed.
However, in the composite segment of the preceding patent application, the external force acting on the composite segment is shared and borne by the first steel material and the second steel material arranged on the two sides of the outer peripheral surface and the outer peripheral portion of the inner peripheral surface. Therefore, when the composite segment becomes wide, each steel material will be overloaded with the external force, and there is a possibility that high strength cannot be obtained.

  This invention is made | formed in view of the said situation, Comprising: While using the amount of steel materials is small and it is low-cost, it aims at providing the synthetic segment which is thin, high intensity | strength, and can be widened. .

  In order to achieve the above object, the composite segment according to the present invention is formed into a circular arc plate shape by filling concrete between a pair of steel skin plates provided on two sides of the tunnel's natural ground side and inner space side. , A composite segment constituting a cylindrical wall body by being connected in the circumferential direction and the axial direction of the tunnel, each skin plate, the outer peripheral portion is fixed along both ends in the axial direction of the tunnel, An arc-shaped ring-to-ring joint plate extending toward the skin plate facing the inner peripheral part, and a skin plate having the outer end fixed partly along both sides in the circumferential direction of the tunnel and facing the inner end part It is characterized by comprising a linear inter-segment joint plate extending toward the side and a dowel protruding and fixed to the opposing skin plate side.

According to the present invention, a pair of steel skin plates are provided on the two surfaces of the natural ground side and the inner air side of the tunnel with the dowels on the opposite surface side, and both end sides of each skin plate in the tunnel axis direction are provided. Since the ring-to-ring joint plate and the inter-segment joint plate are fixedly provided along both ends in the circumferential direction of the tunnel, the entire surface of each skin plate and each joint plate act on the composite segment. It strongly counters tensile stress, and concrete that is filled between the skin plates and integrated with the skin plates by the gibber and the joint plates strongly counters the compressive stress acting on the composite segment.
This ensures the thin, high-strength and widened structure of the synthetic segment, as well as a conventional synthetic segment with a steel shell that covers the entire surface of the main girder surface and joint surface and has a box structure. Therefore, the amount of steel used is small and the cost is low, and the synthetic segment is reduced in weight to improve handling.

In the synthetic segment, a seal groove is formed along the arc direction on the outer surface of the inter-ring joint plate, and a seal groove is formed along the linear direction on the outer surface of the inter-segment joint plate. preferable.
In this way, a seal groove can be formed with high accuracy by machining in the ring-to-ring joint plate and the segment-to-segment joint plate, and the seal of the joint surface between the composite segments by the sealing material is connected to the composite segment. It is possible to satisfactorily seal the joint surface between the rings.

In the synthetic segment, a fireproof layer may be provided on the inner peripheral surface of the inner skin plate.
In this way, even if a fire occurs in the tunnel, the skin plate on the inner side of the tunnel can be reliably prevented from being deteriorated and damaged by the flame, and the inner side skin can be prevented. There is no need for multiple rust prevention treatments such as painting on the inner surface of the plate.

According to the composite segment according to the present invention, a pair of steel skin plates are provided on the two surfaces of the natural ground side and the inner air side of the tunnel with a dowel on the opposite surface side, and the tunnel axial direction of each skin plate is provided. Since the ring joint plate and the inter-segment joint plate are respectively fixed and provided along the both end sides in the circumferential direction of the tunnel, the entire surface of each skin plate and each joint plate Strongly resists the tensile stress acting on the composite segment, and the concrete filled between the skin plates and integrated with each skin plate by the gibber and each joint plate resists the compressive stress acting on the composite segment. The strength of the synthetic segment can be increased against the strong force.
As a result, it is possible to reliably realize a thin, high-strength, widened structure of the synthetic segment, and it is possible to reduce the cost by using less steel compared to the conventional synthetic segment, The handleability can be improved by reducing the weight.

Next, the synthetic segment according to the embodiment of the present invention will be described with reference to the accompanying drawings.
1 to 4 show a synthetic segment 1 according to the first embodiment of the present invention. This synthetic segment 1 forms a tunnel lining body constructed on the inner wall of a road tunnel having a large cross section by, for example, a shield method, and is formed by curving a thin rectangular steel plate into an arc surface. A pair of skin plates 2a and 2b are disposed in parallel to the position on the ground mountain side and the position on the inner sky side of the tunnel, respectively, and concrete 3 is filled between the skin plates 2a and 2b. And is configured in a substantially cylindrical circumferential surface shape (hereinafter referred to as “arc plate shape”).

  And the outer peripheral part (base end part) is fixed to two long sides (both ends in the axial direction of a tunnel) along the circumferential direction of the tunnel in the skin plate 2a on the natural ground side, and the inner peripheral part Arc-shaped joint plates (inter-ring joint plates) 4a and 4a extending along the arc of the skin plate 2a are provided, with the (tip portion) extending toward the facing inner skin side skin plate 2b. Also, two long sides (both ends in the axial direction of the tunnel) along the circumferential direction of the tunnel in the skin plate 2b on the inner air side are fixed with an inner peripheral portion (base end portion) along these, Arc joint plates (inter-ring joint plates) 4b and 4b extending along the arc of the skin plate 2b are provided, with the portion (tip portion) extending toward the facing natural skin plate 2a side.

  In addition, two short sides (both sides in the circumferential direction of the tunnel) along the tunnel axial direction of the skin plate 2a on the natural ground side are fixed with an outer end (base end) along the inner side. Linear joint plates (inter-segment joint plates) 5a and 5a are provided with the portion (tip portion) extending toward the facing inner skin plate 2b. Further, two short sides (both ends in the circumferential direction of the tunnel) along the tunnel axial direction of the skin plate 2b on the inner side are fixed with an outer end (base end) along the inner side. Linear joint plates (inter-segment joint plates) 5b and 5b are provided, with the end portions (tip portions) extending toward the opposing skin plate 2a side.

Each skin plate 2a, 2b has a plurality of dowels 6 that are fixed to the skin plate 2a, 2b in a long side direction and a short side direction. Are arranged in line. The number, the pitch interval, and the arrangement method of the dowels 6 are appropriately set depending on the size of the skin plates 2a and 2b.
The gibber 6 integrates the skin plates 2a and 2b and the concrete filled therebetween with good adhesion, and forms a male screw portion of a bolt on each skin plate 2a and 2b. A bottomed or through hole formed by screwing into a bottomed or penetrating screw hole or a pin having a large-diameter head is made smaller than the shaft portion of the pin provided on the skin plates 2a and 2b. A press-fitted configuration or other suitable configurations can be employed. When a screw hole for screwing the bolt or a hole for press-fitting a pin passes through the skin plates 2a and 2b, the bolt or pin protrudes to the outer peripheral surface of the skin plate 2a and the inner peripheral surface of the skin plate 2b. It is desirable not to do so.

  Further, the joint surface 7 that is the side surface on the short side of the composite segment 1 is located between the opposing tip portions of the joint plates 5a and 5b, and the adjacent segments in the circumferential direction of the tunnel. An inter-segment joint 8 (not shown in FIG. 3) for connection is provided, and the inter-segment joint 8 has a relay joint portion 8a and an insert joint portion 8b. Further, the main girder surface 9 which is the side surface on the long side is located between the opposing tip portions of the joint plates 4a and 4b and is used for connecting segments adjacent to each other in the axial direction of the tunnel. A plurality of male portions 10a (four in the illustrated example) of the inter-ring joint 10 are provided, and a female portion 10b into which the male portion 10a is fitted is provided on the opposing main girder surface 9. A tenon convex portion 11a and a tenon concave portion 11b are provided as tenons 11 to be fitted to each other on the opposing main girder surfaces 9 and 9 (see FIG. 2).

  Further, on the outer surfaces of the joint plates 4a and 4b (surfaces exposed to the outside of the main girder surfaces 9 and 9), arc-shaped seals are provided along the longitudinal direction (long side direction of the skin plates 2a and 2b). Grooves 12a and 12b are formed. Similarly, the joint plates 5a and 5b also have their outer surfaces (surfaces exposed to the outside of the joint surfaces 7 and 7) along the longitudinal direction (short side direction of the skin plates 2a and 2b). Linear seal grooves 13a and 13b that are continuous with the grooves 12a and 12b, respectively, are formed. Thereby, each seal groove 12a, 13a and each seal groove 12b, 13b are formed over the entire circumference of the four sides of the composite segment 1, and a seal material (not shown) is formed in these seal grooves 12a, 12b, 13a, 13b. ) Are fitted.

Further, as shown in FIG. 2, for example, the inter-ring joint 10 is configured by a push grip, the male portion 10 a includes a pin bolt 14, a cap nut portion 15, an anchor bar 16, and the like, and the female portion 10 b includes the pin bolt 14. Are provided with a wedge part 17, an anchor bar 18 and the like.
The joint plates 4a, 4b, 5a, 5b are manufactured by rolling, for example. That is, the steel plate is stretched between the heated and rolled rolls to extend the joint plates 4a, 4b, 5a, 5b to a predetermined thickness and width. At the same time, in the case of the joint plates 4a and 4b, the length of the steel plate is reduced by pressing a wheel-shaped rolling member for forming a seal groove against a surface corresponding to the outer surface of the joint plates 4a and 4b of the steel plate. A concave groove is formed in the direction to form the seal grooves 12a and 12b, and the joint plates 4a and 4b are formed by curving the steel plate with a predetermined curvature.
The inner peripheral surface of the skin plate 2b on the front inner air side is subjected to multiple rust prevention treatments such as painting.

  As described above, the composite segment 1 according to the first embodiment has a pair of steel skin plates 2a and 2b on the two sides of the tunnel ground side and the inner air side, and a plurality of gibber on the opposite side. 6, and joint plates (inter-ring joint plates) 4 a and 4 b and joint plates (segments) along the both ends in the tunnel axis direction of each skin plate 2 a and 2 b and the both ends in the circumferential direction of the tunnel, respectively. Since the intermediate joint plates 5a and 5b are fixedly provided, the entire surface of the skin plates 2a and 2b and the joint plates 4a, 4b, 5a and 5b are strong against the tensile stress acting on the composite segment 1. The concrete is filled between the skin plates 2a and 2b and integrated with the skin plates 2a and 2b by the gibber 6 and the joint plates 4a, 4b, 5a and 5b. There counteract strong compressive stress acting on the synthesis segment 1.

As a result, the thin, high-strength and widened structure of the composite segment 1 is reliably realized, and the conventional composite segment including a steel shell having a box-shaped structure covering the entire main girder surface 9 and the joint surface 7. Compared to the above, the amount of steel used is small and the cost is low, and the synthetic segment 1 is reduced in weight and its handling is improved.
Moreover, in the main girder surfaces 9 and 9 of the composite segment 1, the joint plates 4a and 4b having the outer surfaces in which the seal grooves 12a and 12b are formed are disposed at the corners along the longitudinal direction (long side direction). The distance from the corners of the inner and outer peripheral surfaces of the segment 1 to the seal grooves 12a and 12b is short, the distance between the tips of the joint plates 4a and 4b is widened, and the tenon 11 provided on the main girder surfaces 9 and 9 is provided. In addition, the inter-ring joint 10 can be formed relatively large, and even if the synthetic segment 1 is formed in a thin plate shape with a small thickness, the coupling strength between the synthetic segments 1 and 1 can be increased.

Further, in the synthetic segment 1, the outer peripheral surface and the corners of the four sides of the inner peripheral surface, which are likely to be cracked or chipped, are constituted by the joint plates 4a, 4b, 5a, 5b. Even if it is not covered with, desired strength can be obtained.
Further, the joint grooves 4a, 4b, 5a, 5b are each formed with seal grooves 12a, 12b, 13a, 13b with high precision by machining, and a sealing material is provided on them, so that the joint surfaces of the composite segments 1 are joined together. And a seal between rings formed by connecting the synthetic segments 1 in the circumferential direction can be satisfactorily performed, and leakage of groundwater or the like to the inside of a road tunnel or the like can be reliably prevented.
The synthetic segment 1 has the skin plates 2a and 2b in which the joint plates 4a and 5a and the joint plates 4b and 5b are fixed to the outer periphery and the dowel 6 is fixed on the opposite surface side within the mold. Installed at intervals and filled with concrete from the filling port provided in the mold between the joint plates 4a and 5a or between the joint plates 4b and 5b, so that it can be manufactured with good repeatability and at low cost. be able to.

Next, FIG. 5 shows a synthetic segment 1A according to the second embodiment of the present invention.
The synthetic segment 1A according to the second embodiment has a predetermined thickness of refractory concrete (fireproof) on the inner peripheral surface of the inner skin side skin plate 2b in the synthetic segment 1 according to the first embodiment. Layer) 19 is fixedly provided. Since other configurations are the same as those of the synthetic segment 1, the same or similar components are denoted by the same reference numerals, and description thereof will be omitted.
The refractory concrete 19 is made of fiber-containing concrete mixed with fibers such as polypropylene fiber and steel fiber, for example, and by mixing the fiber, the tensile strength is improved as compared with normal concrete. Even if thermal expansion occurs, damage such as cracks can be suppressed. Then, the refractory layer is formed by filling the refractory concrete 19 between the inner peripheral surface of the inner skin plate 2b and the inner surface of the mold when the synthetic segment 1 is manufactured in the mold. Alternatively, the refractory concrete 19 may be formed in an arc plate-like panel, and this may be attached to the inner peripheral surface of the skin plate 2b with an adhesive.

According to the composite segment 1A according to the second embodiment, in addition to the same operations and effects as the composite segment 1, even if a fire occurs in the tunnel, the inner side of the tunnel This prevents the skin plate 2b from being deteriorated by a flame or deformed and damaged due to thermal expansion, and the inner skin side skin plate 2b is not exposed on the inner peripheral surface side of the synthetic segment 1A. It is not necessary to perform multiple rust prevention treatments such as painting on the inner peripheral surface of the skin plate 2b.
In the synthetic segments 1 and 1A according to each of the above embodiments, the tenon projections 11a and the tenon depressions 11b are disposed as the tenon 11 on the main girder surfaces 9 and 9, but only the inter-ring joint 10 may be used.

It is a perspective view of the synthetic segment by 1st embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line II in FIG. 1. FIG. 2 is a cross-sectional view of FIG. It is a perspective view which shows the steel shell of the synthetic | combination segment shown in FIG. It is sectional drawing corresponding to FIG. 2 of the synthetic | combination segment by 2nd embodiment of this invention.

Explanation of symbols

1,1A Composite segment 2a, 2b Skin plate 3 Concrete 4a, 4b Joint plate (inter-segment joint plate)
5a, 5b Joint plate (Ring joint plate)
6 Giber 7 Joint surface 8 Inter-segment joint 9 Main girder surface 10 Inter-ring joint 12a, 12b, 13a, 13b Seal groove 19 Refractory concrete (refractory layer)

Claims (3)

By filling concrete between a pair of steel skin plates provided on two sides of the natural ground side and the inner side of the tunnel, it is formed into an arc plate shape, and a plurality of them are connected in the circumferential direction and axial direction of the tunnel A synthetic segment constituting a cylindrical wall,
Each skin plate has an arc-shaped ring-to-ring joint plate having a base end portion fixed along both side edges in the axial direction of the tunnel and a tip portion extending toward the facing skin plate side. Linear segment-to-segment joint plate with its proximal end fixed along both sides in the direction and extending toward the opposing skin plate side, and a diver protruding and fixed to the opposing skin plate side And a synthetic segment.   The seal groove is formed along the arc direction on the outer surface of the joint plate between rings, and the seal groove is formed along the linear direction on the outer surface of the joint plate between segments. The synthetic segment according to 1. The synthetic segment according to claim 1 or 2, wherein a fireproof layer is provided on an inner circumferential surface of the skin plate on the inner air side.

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