JP4593324B2 - Synthetic segment - Google Patents

Description

  The present invention relates to a synthetic segment manufacturing method and a synthetic segment formed by placing concrete inside a steel arcuate plate frame.

Conventionally, as a method used to construct a tunnel, a so-called shield method is generally used in which a tubular wall body is constructed by connecting a plurality of arc-shaped segments to the inner surface of a tunnel-shaped excavation hole. is there. When connecting the segments in the excavation hole, the segment joint and ring joint of each segment are connected to the segment joint and ring joint of the other segment, respectively, and each segment adjacent to the axial direction of the excavation hole is, for example, 1 in the circumferential direction. It is designed to be shifted by a length of / 2.
As segments used in the shield method, for example, three types of segments are known: RC (made of reinforced concrete) segments, steel (steel) segments, and composite segments using a combination of steel (steel) and concrete. Among these segments, the synthetic segment is manufactured by filling a steel arcuate plate frame (steel shell) with concrete.

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 demand, 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 thin and has high strength.
When the RC segment is used as such a segment, there is a disadvantage that the thickness is larger in order to ensure the same strength as the synthetic segment or steel, and does not meet the above-described requirement of thin and high strength. In addition, when a tunnel is constructed using the RC segment, it is necessary to form a seal groove for the seal material to prevent groundwater or the like from entering the tunnel. In this case, if a seal groove is formed in the vicinity of the outer peripheral surface (surface on the ground side) or the inner peripheral surface (inner side), there is a risk of cracking, and it must be formed near the center in the thickness direction. For this reason, it has been difficult to reduce the thickness of the RC segment. Moreover, the formwork for producing the RC segment was expensive.

Further, when a steel segment is used, the entire surface of the segment is covered with a steel frame, so that it can be thinned with high strength. However, there is a drawback that the amount of steel used is large and the cost is high. In addition, the seal grooves are formed on the main girder surface and the joint surface made of a steel plate material. In addition, when the segment is enlarged, there is a high possibility that distortion due to welding or the like is likely to occur and correction is required, and that accuracy is lowered.
On the other hand, although the synthetic segment is higher in cost than the RC segment, it can be manufactured at a lower cost than the steel segment at a thin and high strength. An example of such a synthetic segment is disclosed in Patent Document 1.
The synthetic segment described in Patent Document 1 is formed of a curved main girder surface or a flat joint surface made of a steel plate having a U-shaped cross-sectional view, and the main girder surface or joint surface is sealed by machining or the like. Grooves were formed.
Moreover, there exists what was described in the prior Japanese Patent Application No. 2004-207350 application as another synthetic segment. In this synthetic segment, a steel material having a substantially L-shaped cross section that is curved in an arc shape is disposed opposite to two sides of opposing corners of the outer peripheral surface and the inner peripheral surface constituting the steel shell, A seal groove is formed on one surface located on the main girder surface. And the joint and the tenon were provided between each one surface of the two L-shaped steel materials provided in the corner | angular part of the main girder surface.
JP 11-159293 A

However, since the synthetic segment described in Patent Document 1 has a configuration in which a seal groove is formed in a steel plate covering the entire surface of the main girder surface and the joint surface, the use area of the steel material in the segment increases, and the manufacturing cost increases. There is.
In addition, in another synthetic segment described in the preceding Japanese Patent Application No. 2004-207350, there is a drawback that a space for providing a joint or a tenon is small because each surface of the steel material having an L-shaped cross section is located on the main girder surface. is there. Therefore, there is a problem that high connection strength cannot be obtained in a thin segment having a small thickness.

  In view of such a situation, an object of the present invention is to provide a synthetic segment having a small thickness and a high strength while using a small amount of steel material at a low cost.

The composite segment according to the present invention is a composite segment in which concrete is cast inside a steel shell, and is curved into a substantially arc-shaped plate that forms a cylindrical wall body by being connected in the circumferential direction and the axial direction. The steel shell is curved in a substantially arc shape and is provided with a pair of first steel materials provided on two opposite sides of the outer peripheral surface, and a pair of steel members that are provided in the two opposite sides of the inner circumferential surface with a substantially arcuate shape. A first steel member and a second steel member. The end surfaces of the first and second steel members are exposed to the outside, and a seal groove is formed on the end surface of the tree. And a joint member for connecting both ends of the pair of second steel materials, respectively, and a seal groove is formed in each joint member and connected to the seal grooves of the first and second steel materials, and the main girder surface of the composite segment There is a concrete surface in the gap between the first steel material and the second steel material. Out inter-ring joint is provided, on the joint surface of the composite segment inter-segment joint is provided to expose the concrete surface in the gap between the joint member and the joint member, the outer peripheral surface of the synthetic segment of the pair of first steel The concrete surface is exposed between, and the inner peripheral surface is characterized in that the concrete surface is exposed between the pair of second steel materials.
According to the present invention, since the seal groove is formed on the tree end surfaces of the first and second steel materials provided on each of the two sides of the outer peripheral surface and the inner peripheral surface as the composite segment structure, the steel material used as the steel shell is mainly used. Compared to the conventional type that covers the girder surface and joint surface, the cost is low, and the synthetic segment can be made thin, and the space for installing the tenon and joint on the main girder surface can be set large and high. It is strength.
By forming the seal groove in the pair of joint members together with the seal groove of the first steel material and the second steel material and mounting the seal material, it is possible to seal the entire circumference of the synthetic segment and reliably prevent water leakage and the like.

Moreover, it is preferable that the cross sections orthogonal to the longitudinal direction of the first and second steel materials are substantially rectangular.
The first and second steel materials can be easily manufactured by rolling or the like and can be miniaturized.

Further, the inside of the first steel third steel is provided with a curved arcuately their respective separating the first steel, on the inside of the second steel arcuately separated, respectively it to the second steel A fourth steel material that is curved may be provided.
The third and fourth steel materials together with the first and second steel materials constitute the structural material of the composite segment, and can be made to have high strength even in a thin and small structure.
Moreover, the 3rd steel material and the 4th steel material are arrange | positioned facing each other, and may be connected with the connection member.
This can further improve the strength of the synthetic segment.

According to the synthetic segment according to the present invention, since the seal groove is formed on the wood end surfaces of the first and second steel materials constituting the steel shell, the amount of the steel material used is small and low cost, and the first and A joint and tenon of a required size can be provided between the second steel materials, and the strength is high.
In addition, by forming the seal grooves in the pair of joint members together with the seal grooves of the first steel material and the second steel material, the entire circumference of the synthetic segment can be sealed and water leakage and the like can be reliably prevented.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
1 to 4 show a composite segment according to the first embodiment. FIG. 1 is a perspective view of the composite segment, FIG. 2 is a longitudinal sectional view of the composite segment shown in FIG. 1, and FIG. FIG. 4 is an exploded perspective view in which the skin plate is separated from the composite segment.
As shown in FIG. 1, the composite segment 1 according to the present embodiment 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 has a thin, substantially rectangular plate shape. The object is curved into a substantially cylindrical peripheral surface shape (hereinafter referred to as an arc plate shape). 1 to 3, the composite segment 1 has a steel shell 2 and concrete 3 filled therein.
And the joint surface 4 which is the short side surface of the composite segment 1 is provided with an inter-segment joint 5 for connecting in the circumferential direction of the tunnel. The inter-segment joint 5 includes a relay joint portion 5a and an insert joint portion 5b. Have. For example, four male portions 7a of the inter-ring joint 7 for connecting the tunnel in the axial direction are provided on the main girder surface 6 which is the long side surface, and the male portion 7a is fitted on the opposing main girder surface 6. A mating female portion 7b is provided. A tenon convex portion 8a and a tenon concave portion 8b are provided as tenons 8 to be fitted to each other on the opposing main girder surfaces 6 and 6 (see FIG. 2).

Next, the steel shell 2 of the synthetic segment 1 will be described with reference to FIGS. In the steel shell 2 shown in FIG. 3, an outer frame body portion 9 (first frame) composed of four sides constituting the frame portion of the outer peripheral surface of the composite segment 1 is formed on the outer peripheral surface located on the natural mountain side in a state of being installed in the tunnel. Body part) is formed. The outer frame body portion 9 is formed of a pair of first steel materials 10 and 10 having a long side curved into a substantially cylindrical circumferential shape and having a substantially rectangular cross section. Both end portions of the pair of first steel materials 10 and 10 are connected by plate-like joint plates 11 and 11 located on the joint surface 4.
In addition, the inner peripheral surface located on the inner side of the composite segment 1 in the state of being installed in the tunnel is opposed to the outer frame body portion 9, and the inner frame body portion 12 (the first frame) comprising four sides constituting the frame portion of the inner peripheral surface. A two-frame body part) is formed. The inner frame body 12 is formed of a pair of second steel members 13 and 13 having a long side curved into a substantially cylindrical circumferential shape and having a substantially rectangular cross section. Both end portions of the pair of second steel materials 13 and 13 are connected by plate-like joint plates 14 and 14 located on the joint surface 4. The joint plates 11 and 14 are set to have the same width as the thickness of the first and second steel materials 10 and 13, for example.
Both the outer frame part 9 and the inner frame part 12 are made of steel, and preferably have the same dimensions.

On the inner side between the first steel materials 10, 10, plate-shaped third steel materials 15, 15 connected to and integrated with the first steel materials 10 are provided. Each third steel material 15 is preferably formed in the same curved shape with the same cross-sectional shape as the first steel material 10. Moreover, the plate-shaped 4th steel materials 16 and 16 connected with each 2nd steel material 13 and united are connected inside each 2nd steel material 13 and 13. As shown in FIG. Each fourth steel material 16 is also formed in the same curved shape with the same cross-sectional shape as the second steel material 13.
And the 3rd steel material 15 and the 4th steel material 16 which oppose the thickness direction of the steel shell 2 are mutually connected by the lattice 18 (connection member) which makes a substantially V shape, for example. A plurality of lattices 18 are arranged continuously in the longitudinal direction of the third steel material 15 and the fourth steel material 16.
In the outer frame portion 9 and the inner frame portion 12 shown in FIGS. 2 and 3, the wood end surfaces 10 a and 13 a (corresponding to the thickness) exposed on the main girders 6 of the first steel material 10 and the second steel material 13. Are formed with seal grooves 20, 20 along the longitudinal direction thereof. Similarly, since the joint plates 11 and 14 are formed with seal grooves 21 and 21 continuous with the seal grooves 20 and 20 of the wood end surfaces 10a and 13a, the seal grooves 20 and 21 are formed over the entire circumference of the four sides. ing. A sealing material is fitted into these seal grooves 20 and 21.

And as shown in FIG. 4, the skin plate 23 is welded to the outer side frame part 9 by watertight welding.
2 is composed of, for example, a push grip, the male part 7a includes a pin bottle 25, a cap nut part 26, an anchor bar 27, and the like, and the female part 7b is a wedge for fitting and locking the pin bottle 25. The part 28, the anchor muscle 29, etc. are provided.
Moreover, the 1st steel material 10 and the 2nd steel material 13 are manufactured by rolling, for example. That is, the steel material is stretched to a predetermined thickness and width dimension of the first steel material 10 and the second steel material 13 by feeding the plate-shaped steel material between the hot rolling rolls. At the same time, at the time of rolling, a wheel-shaped rolled member having a width slightly smaller than the thickness of the wood end surfaces 10a, 13a on the wood end surfaces 10a, 13a, which are side surfaces in the thickness direction of the first steel material 10 and the second steel material 13 made of this steel Is pressed to form a groove in the length direction of the steel material to form a seal groove 20. The first steel material 10 and the second steel material 13 are formed by bending the steel material with a predetermined curvature.

Since the synthetic segment 1 according to the present embodiment has the above-described configuration, the first steel material 10 and the second steel material 13 constituting the steel shell 2 are substantially plate-shaped steel materials on the main girder surfaces 6 and 6. Since the seal grooves 20 and 20 are formed on the exposed wood end surfaces 10a and 13a, the steel material is compared with the case where a seal groove is formed on one surface of a steel material having an L-shaped cross section like a conventional synthetic segment steel shell. The amount of use is small, and the cost is low.
Moreover, in the main girder surface 6 of the composite segment 1, the first and second steel materials 10, 13 are disposed at the corners in the longitudinal direction and the wood end surfaces 10 a, 13 a in which the seal grooves 20 are formed are positioned. The distance from the corner of the surface to the seal groove 20 is short, the tenon 8 between the wood end faces 10a and 13a and the joint 7 between rings can be formed relatively large, and the synthetic segment 1 is formed into a thin plate with a small thickness. Even if formed, the connection strength between the segments 1 and 1 is high.

Moreover, in the synthetic segment 1, since the corner | angular part of the outer peripheral surface and inner peripheral surface which are easy to produce a crack and a chip | tip is comprised by the 1st steel material 10 and the 2nd steel material 13 of cross-sectional substantially rectangular shape, A desired strength can be obtained without covering the whole with a steel material. Moreover, since the 3rd steel material 15 and the 4th steel material 16 which have the same curved shape were integrally formed inside the 1st steel material 10 and the 2nd steel material 13, when forming a tunnel, the external force of the arc direction from a natural ground side etc. Further, even higher strength can be exerted against an external force in a direction from the outer peripheral surface of the composite segment 1 toward the inner peripheral surface.
Further, the third steel material 15 and the fourth steel material 16 are connected by a lattice 18, and the first steel material 103 and the third steel material 15, and the second steel material 13 and the fourth steel material 16 are integrated, respectively. The synthetic segment 1 can be stably manufactured at a low cost without causing a positional shift of the structural member within the mold when the segment 1 is manufactured.
In addition, by forming seal grooves 20 and 21 in the first steel material 10 and the second steel material 13 and the joint plates 14 and 14, respectively, and providing a seal material, it is connected to the other synthetic segment 1 and inside the road tunnel or the like. It is possible to reliably prevent leakage of groundwater into the water. Moreover, when this composite segment 1 is applied to a road tunnel, the digit height can be reduced by the thickness of the segment 1.

Next, a second embodiment of the present invention will be described based on FIG. 5 which is a cross-sectional view similar to FIG. In addition, in this 2nd embodiment, description is abbreviate | omitted using the same code | symbol for the part which is common in 1st embodiment.
In the synthetic segment 30 by 2nd embodiment, the point which is different from 1st embodiment is having employ | adopted the structure which isolate | separated the 1st steel material 10 and the 3rd steel material 15, and the 2nd steel material 13 and the 4th steel material 16, respectively. .
Therefore, in the synthetic segment 30 according to the present embodiment, the stress generated in the central portion is shared by the third and fourth steel materials 15 and 16 provided separately from the first and second steel materials 10 and 13. Therefore, it is suitable for application to a wide synthetic segment.

In each of the above-described embodiments, the first steel material 10, the second steel material 13, the third steel material 15, and the fourth steel material 16 constitute the structural material of the composite segment 1. Further, the lattice 18 is provided to connect the third steel material 15 and the fourth steel material 16 when the steel shell 2 is disposed in the mold when the synthetic segment 1 is manufactured. However, the lattice 18 is not necessarily provided. . Further, the third steel material 15 and the fourth steel material 16 themselves are not necessarily provided.
Moreover, in each above-mentioned embodiment, although the sealing groove | channel 20 provided in the wood end surfaces 10a and 13a of the 1st steel material 10 and the 2nd steel material 13 was simultaneously rolled and formed with the wheel-shaped member at the time of the rolling process of each steel material 10 and 13. Instead of this, the first steel material 10 and the second steel material 13 may be formed by machining such as cutting after the formation.
Further, in the first embodiment, the lattice 18 has a structure in which a plurality of plate-like or bar-like members are arranged in a substantially V shape. It is not necessary to have the shape, and a connection member having an arbitrary shape can be adopted.
Further, although the tenon convex part 8a and the tenon concave part 8b are provided as tenons on the main girder surfaces 6 and 6, only the inter-ring joint 7 may be used.

It is a perspective view of the synthetic segment by 1st embodiment of this invention. It is the AA longitudinal cross-sectional view of the synthetic | combination segment shown in FIG. It is a perspective view which shows the steel shell of the synthetic | combination segment shown in FIG. It is the disassembled perspective view which isolate | separated the skin plate from the synthetic | combination segment shown in FIG. It is a longitudinal cross-sectional view similar to FIG. 2 of the synthetic | combination segment by 2nd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 30 Composite segment 2 Steel shell 3 Concrete 4 Joint surface 6 Main girder surface 10 1st steel materials 10a and 13a Wood end surface 13 Second steel material 14 Joint member 15 Third steel material 16 Fourth steel material 18 Lattice (connection member)
20, 21 Seal groove

Claims (4)

A concrete segment is formed by placing concrete inside the steel shell, and is curved into a substantially arc plate shape that forms a cylindrical wall body by being connected in a plurality in the circumferential direction and the axial direction,
The steel shell is curved in a substantially arcuate shape and is provided with a pair of first steel materials provided on two opposite sides of the outer peripheral surface, and a pair of first steel members that are curved in a substantially arcuate shape and provided on two opposite sides of the inner peripheral surface. Two steel materials,
The wood end surfaces of the first and second steel materials are respectively exposed to the outside and a seal groove is formed on the wood end surface,
The joint surface of the synthetic segment is provided with a joint member that connects both ends of the pair of first steel materials and both ends of the pair of second steel materials, respectively, and seal grooves are formed in the joint members, respectively. And connected to the seal groove of the second steel material,
A concrete surface is exposed in the gap between the first steel material and the second steel material on the main girder surface of the synthetic segment, and a joint between rings is provided,
The joint surface of the synthetic segment is provided with an inter-segment joint by exposing a concrete surface in the gap between the joint member and the joint member,
The synthetic segment is characterized in that the outer peripheral surface of the synthetic segment has a concrete surface exposed between a pair of first steel materials, and the inner peripheral surface has a concrete surface exposed between a pair of second steel materials .     The synthetic segment according to claim 1, wherein the first and second steel materials have a substantially quadrangular cross section perpendicular to the longitudinal direction. Wherein the inner side of the first steel third steel curved arcuately separated, respectively it said first steel is provided,
Wherein the inner side of the second steel, synthetic segment according to claim 1 or 2, fourth steel curved arcuately separated, respectively it said second steel material is provided. 4. The synthetic segment according to claim 3 , wherein the third steel material and the fourth steel material are arranged to face each other and are connected by a connecting member.

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