JP4071780B2 - Synthetic segment - Google Patents

Description

  The present invention relates to a segment that forms a cylindrical wall body by being connected in a circumferential direction and an axial direction along the inner surface of a drilling hole, specifically, a composite using a structural member such as steel and concrete. Regarding segments.

  At present, a so-called shield method is generally used as a method for constructing a tunnel, in which a cylindrical wall body is constructed by connecting a plurality of arc-shaped segments on the inner surface side of an excavation hole. As a segment used in this shield method, for example, a composite segment made of concrete, steel, or a composite use of steel and concrete is known, and the one described in Patent Document 1 is an example of a composite segment.

The synthetic segment described in Patent Document 1 (hereinafter simply referred to as a segment) has two main girders, two joint plates, and a skin plate, and has an arc plate shape with an open end. In addition, at least one substantially H-shaped slip stopper is further arranged between the two main girders, and then filled with filling concrete from the opening end, and the inner and outer circumferences of the segments that are prone to cracking and chipping. High strength is exhibited by constituting most of the frame of the segment including the corners of the four sides of the surface with structural members.
In addition, since most of the frame of the segment is covered with a structural member, a certain consideration is given to water stoppage against water leakage from the natural ground side.
JP 2003-27894 A

However, in recent years, in addition to demands for higher strength and water-stopping requirements for segments, there are increasing demands for thickness reduction and cost reduction.
However, as in the segment described in Patent Document 1, in the case where the entire periphery other than the opening is covered with a structural member (steel material), the thickness of the segment itself increases in order to obtain a predetermined strength. The weight also tended to increase. Furthermore, since the amount of steel used is large, it is difficult to meet the demand for cost reduction even if the strength and water stoppage can be satisfied.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a composite segment that achieves a reduction in thickness and cost while maintaining sufficient strength.

In order to solve the above-mentioned problems and achieve this object, the composite segment according to the present invention is an arc-shaped composite segment that forms a cylindrical wall body by being connected in the circumferential direction and the axial direction. A first structural member having a substantially L-shaped cross-section covering the corners of the four sides of the arc-shaped outer peripheral surface, and a second structural member having a substantially L-shaped cross-section covering the corners of the four sides of the arc-shaped inner peripheral surface, A skin plate is welded to the first structural member on the outer peripheral surface by water-tight welding, and a third structural member extending in an arc shape is provided on the inner side of the first structural member on the outer peripheral surface. In addition, a fourth structural member that extends in an arc from the second structural member is provided inside the second structural member on the inner peripheral surface, and is defined by the first structural member and the second structural member. It is characterized by being formed by placing concrete in the space formed.
According to the present invention, by adopting a steel shell structure in which the corners on the four sides of the inner and outer peripheral surfaces of the composite segment that are likely to be cracked and chipped are covered with a structural member having a substantially L-shaped cross section, Since cracks and chips are prevented and high strength is exhibited, thinning can be achieved, and the amount of steel used can be reduced to reduce costs.
In order to cover each corner of the four sides of the inner and outer peripheral surfaces with a structural member, the first structural member and the second structural member are disposed at least at the corners of the two sides or the four sides facing each other of the outer peripheral surface and the inner peripheral surface. That's fine.
By further providing the third and fourth structural members extending in the arc direction of the outer peripheral surface and the inner peripheral surface, high strength can be obtained against the external force in the arc direction and the external force in the direction from the outer peripheral surface toward the inner peripheral surface. Demonstrate. Moreover, since the first structural member, the third structural member, the second structural member, and the fourth structural member are separated from each other, the strength of the entire synthetic segment can be balanced.

The composite segment according to the present invention is an arcuate plate-shaped composite segment that forms a cylindrical wall body by being connected in a plurality in the circumferential direction and the axial direction, and along two opposing sides of the outer peripheral surface forming an arc shape. A first structural member having a substantially L-shaped cross section that is formed in an arc shape and covers the corners of the two sides, and an arc shape along two opposing sides of the arcuate inner peripheral surface. A second structural member having a substantially L-shaped cross-section covering the corners of the sides, and a skin plate is welded to the first structural member on the outer peripheral surface by watertight welding, and both ends of the first structural member and the second structural member Both ends are connected to each other by a plate portion positioned on a surface having a joint between segments, and a third structure that extends in an arc shape is separated from the first structural member inside the first structural member on the outer peripheral surface. Members are provided, and the second structure is formed inside the second structure member on the inner peripheral surface. Separated from member is provided with a fourth structural member extending in an arc shape, characterized by being formed by Da設concrete in a space defined by the first structural member and the second structural member And
According to the present invention, the first and second structural members along the two opposite sides of the outer peripheral surface and the inner peripheral surface are cracked or chipped at the corners of the inner and outer peripheral surfaces of the composite segment and the corners along the sides. In addition to ensuring high strength, the amount of steel used can be reduced to further reduce costs.
Furthermore, the both ends of the first and second structural members are connected to each other, and the corners can be prevented from being chipped or cracked by the plate portions located on the surface in the thickness direction of the composite segment.
By further providing the third and fourth structural members extending in the arc direction of the outer peripheral surface and the inner peripheral surface, high strength can be obtained against the external force in the arc direction and the external force in the direction from the outer peripheral surface toward the inner peripheral surface. Demonstrate. Moreover, since the first structural member, the third structural member, the second structural member, and the fourth structural member are separated from each other, the strength of the entire synthetic segment can be balanced.

In addition, the first structural member and the second structural member are a first plate portion formed in an arc shape along the outer peripheral surface and a second plate portion formed along the (main girder) surface in the thickness direction of the composite segment. Are preferably formed in contact with each other in a substantially orthogonal direction.
The first and second plates constituting the first structural member and the second structural member are easy to manufacture because they are abutted in a direction substantially orthogonal to each other without being welded or integrated, and are formed in a plate shape. . In addition, a seal groove can be provided on the wooden end surface of the second plate.

Further, the synthetic segment is formed with a seal groove around the surface in the thickness direction of the synthetic segment of the first structural member and the second structural member, and a sealing material is provided in the seal groove.
The sealing material reliably prevents water leakage into the gap between the concrete side surface and the structural member. When the first structural member and the second structural member are formed in contact with each other without welding the first and second plates, a seal groove is formed in the second plate.

According to the synthetic segment according to the present invention, by adopting a steel shell structure in which the corners on the four sides of the inner and outer peripheral surfaces of the synthetic segment, which are likely to be cracked and chipped, are covered with a structural member having a substantially L-shaped cross section, are protected. In addition, since cracks and chips at corners are prevented and high strength is exhibited, thinning can be achieved, and the amount of steel used can be reduced to reduce costs. And it functions as a water stop means which prevents water permeation reliably by watertightly welding the skin plate to a structural member having a substantially L-shaped cross section.
In addition, by further separating the third and fourth structural members extending in the arc direction on the outer peripheral surface and the inner peripheral surface, the external force in the arc direction and the external force in the direction from the outer peripheral surface toward the inner peripheral surface are provided. High strength can be exhibited, and the strength of the entire synthetic segment can be balanced, which is suitable for application to a wide segment.

In addition, a seal groove is formed around the structural member that covers the corners of the four sides of the inner and outer peripheral surfaces of the composite segment, and a seal material is provided in the seal groove. The material can reliably prevent water leakage into the gap between the concrete side surface and the structural member.
Furthermore, by applying durable water-stopping means to the structural members exposed on the natural ground side, the outer peripheral structural members are prevented from being directly exposed to water leakage, so that the structural members have good corrosion resistance. Can do.

  1 to 4 show a first embodiment of a segment according to the present invention. FIG. 1 is an overall perspective view of the segment of the first embodiment. In this embodiment, the segment 1 constituting the cylindrical wall body has an arc plate shape, and the four sides of the outer peripheral surface 2 on the natural mountain side are shown. A steel shell of segment 1 is defined by a first structural member 3 made of steel covering the corners and a second structural member 5 made of steel covering the four corners of the inner peripheral surface 4 on the inner side. Concrete 6 is placed in the defined space.

  Here, the first structural member 3 covering the corners of the four sides of the outer peripheral surface 2 of the segment 1 has a substantially L-shaped cross section. The configuration of the first structural member 3 will be described in further detail. With respect to the short direction (axial direction of the excavation hole), the plate portions 3a and 3a extending along the outer peripheral surface 2 and the thickness direction of the segment 1 are aligned. Plate portions 3c and 3c are formed. Further, also in the longitudinal direction of the first structural member 3 (circumferential direction of the excavation hole), the first plate portions 3b and 3b extending along the outer peripheral surface 2 and the thickness direction of the segment 1 are extended. Second plate portions 3d and 3d are formed.

  Similarly, the second structural member 5 covering the corners of the four sides of the inner peripheral surface 4 of the segment 1 also has a plate portion extending along the inner peripheral surface 4 in the short direction (axial direction of the excavation hole). 5a, 5a and plate portions 5c, 5c extending along the thickness direction of the segment 1 are formed, and the longitudinal direction (circumferential direction of the excavation hole) is also extended along the inner peripheral surface 4. One plate portions 5b and 5b and second plate portions 5d and 5d extending along the thickness direction of the segment 1 are formed.

A skin plate 7 is welded to the first structural member 3 on the outer peripheral surface 2 side by watertight welding.
The plate portions 3c, 3d of the first structural member 3 are formed with seal grooves 8 over the entire circumference in the direction along the outer peripheral surface 2, and the plate portions 5c, 5d of the second structural member 5 are A seal groove 9 is formed over the entire circumference in a direction along the inner peripheral surface 4. A seal material 10 is provided in the seal groove 8 and the seal groove 9.

  Further, the segment 1 has an inter-segment joint 21 for connecting the excavation holes in the circumferential direction. The inter-segment joint 21 includes a relay fitting 21a and an insert fitting 21b. The segment 1 further includes an inter-ring joint 22 for connecting in the axial direction of the excavation hole. In the present embodiment, four inter-ring joints 22 are provided.

FIG. 2 is a schematic diagram of a cross section taken along line AA of FIG. In the first embodiment, the plate portions 3b and 3b in the longitudinal direction of the first structural member 3 covering the corners of the four sides of the outer peripheral surface 2 of the segment 1 are flat plate-like third structures that also extend in the longitudinal direction. The members 23 and 23 are integrated.
Similarly, the plate parts 5b and 5b in the longitudinal direction of the second structural member 5 covering the corners of the four sides of the inner peripheral surface 4 of the segment 1 are flat plate-like fourth structural members 24 and 24 that also extend in the longitudinal direction. And integrated.

  FIG. 3 shows the steel shell 25 of the segment 1 according to the first embodiment. As can be understood from this figure, the third structural member 23 and the fourth structural member 24 arranged above and below are connected to each other by a connecting member 26. Here, in the present embodiment, the connection member 26 has a lattice-like structure in which a plurality of hook-shaped portions are arranged obliquely.

  Further, a skin plate 7 is attached to the outer peripheral surface 2 of the segment 1 by means such as watertight welding as shown in FIG. This skin plate 7 functions as a water stop means for preventing water from entering the steel shell 25.

In the segment 1 having the above-described configuration, the corners of the four sides of the outer peripheral surface 2 and the inner peripheral surface 4 that are likely to be cracked or chipped are covered with the first structural member 3 and the second structural member 5 having a substantially L-shaped cross section. Therefore, a desired segment strength can be achieved without covering the entire segment 1 with a steel material.
Further, since the third structural member 23 and the fourth structural member 24 extending in the arc direction of the outer peripheral surface 2 and the inner peripheral surface 4 are provided, the external force in the arc direction and the direction from the outer peripheral surface 2 to the inner peripheral surface 4 Higher strength can be exhibited against external force.

  Further, in the first embodiment, the third structural member 23 and the fourth structural member 24 are connected by the connecting member 26, and the first structural member 3, the third structural member 23, and the second structural member are connected. Since the member 5 and the fourth structural member 24 are integrated, there is no positional displacement of the structural member in the mold when the segment 1 is manufactured, and the segment 1 can be manufactured stably at low cost. it can.

Further, since the seal groove 8 is formed around the first structural member 3 and the seal groove 9 is formed around the second structural member 5, and the seal material 10 is provided in the seal groove 8 and the seal groove 9, this seal material. Thus, water leakage to the gap between the side surface of the concrete 6 and the structural member can be reliably prevented.
Furthermore, since the skin plate 7 is watertightly welded to the outer peripheral surface 2 (the natural ground side) as a water stop means, the outer peripheral surface 2 is prevented from being directly exposed to water leakage. The skin plate has good durability against wear by the tail brush.

Next, although other embodiment of this invention is described, the same code | symbol is distribute | arranged to the part which is common in 1st embodiment, and description is abbreviate | omitted.
First, a second embodiment of the present invention will be described based on FIG. 5 which is a schematic sectional view similar to FIG.
In this second embodiment, instead of providing the skin plate 7, a water-stopping agent 27 is applied to the boundary portion between the concrete 6 and the third structural member 23 on the outer peripheral surface 2 as a water-stop means on the one-dot chain line portion of FIG. 5. Has been. The water stop agent 27 is preferably durable against wear by the tail brush.

  Accordingly, since the skin plate 7 is not provided in the segment 1 according to the second embodiment, the water-tight welding process can be omitted, and the amount of the water-stopping agent 27 applied can be used for the purpose of water-stopping. The segment 1 can be manufactured at a lower cost because it is the minimum necessary to achieve this.

  Next, a third embodiment of the present invention will be described based on FIG. 6 which is a schematic sectional view similar to FIG. In the third embodiment, unlike the previous embodiment, the first structural member 3 and the third structural member 23, and the second structural member 4 and the fourth structural member 24 are not integrated but are provided separately. Structure.

  Therefore, in the segment 1 according to the third embodiment, the stress generated in the central portion can be shared by the third structural member 23 and the fourth structural member 24 provided separately, so that the wide Suitable for application to segment 1.

  Next, a fourth embodiment of the present invention will be described based on FIG. 7 which is a schematic sectional view similar to FIG. In the fourth embodiment, as compared with the third embodiment, a water stop agent 27 is provided as a water stop means at a boundary portion between the concrete 6 on the outer peripheral surface 2 and the third structural member 23 and the first structural member 3. It is applied to the one-dot chain line portion of FIG. As in the second embodiment, it is desirable that the water blocking agent 27 is durable against wear by the tail brush.

  Accordingly, the segment 1 according to the fourth embodiment is suitable for the wide segment 1 as in the third embodiment, and can also improve the water stoppage.

  Next, a fifth embodiment of the present invention will be described based on FIG. 8 which is a schematic sectional view similar to FIG. In the fifth embodiment, a skin plate 7 is watertightly welded to the outer peripheral surface 2 as a water stopping means in the third embodiment.

  Accordingly, the segment 1 according to the fifth embodiment is suitable for the wide segment 1 as in the third embodiment, and the outer peripheral surface 2 is prevented from being directly exposed to water leakage, thereby improving the water stoppage. To do.

Next, a sixth embodiment of the present invention will be described based on FIG. 9 which is a schematic sectional view similar to FIG. In the sixth embodiment, the skin plate 7 is divided and attached to the fifth embodiment so as to cover a portion where neither the plate portion 3b of the first structural member 3 nor the third structural member 23 exists. is doing.
For this reason, the skin plate 7 has a structure divided into one central portion 7a and two end portions 7b.

  Accordingly, in the segment 1 according to the sixth embodiment, the water stoppage can be improved similarly to the fifth embodiment, and the skin plate 7 is mounted only at a necessary portion, so that the amount of steel used is reduced. As a result, the segment 1 can be stably manufactured at a low cost.

  Next, a seventh embodiment of the present invention will be described with reference to FIG. The segment 1 according to the seventh embodiment has a first structural member 3 and a second structural member 5 and has an uneven tenon 28 formed at a joint portion between the rings. In the present embodiment, a convex tenon 28a is formed on the well opening side, and a concave tenon 28b is formed on the face side. In addition, the tenon 28a is provided with a fitting receiving portion for the inter-ring joint 22 on one side and the inter-ring joint 22 on the other side (not shown).

  Therefore, also in the segment 1 according to the seventh embodiment, a desired segment strength can be achieved without covering the entire segment 1 with steel material, and the gap between the side surface of the concrete 6 and the structural member can be achieved by the sealing material 10. Further, since the tenon 28 is formed in the joint portion between the rings, the structure of the joint portion can be strengthened.

Next, an eighth embodiment of the present invention will be described with reference to FIGS. The synthetic segment 1 according to the eighth embodiment covers two opposite corners of the arcuate outer peripheral surface 2 of the segment 1 in the steel shell 25 of the segment 1 according to the first embodiment. 3A of 1st structural members and 5 A of 2nd structural members which cover the corner | angular part of the two opposing sides of the internal peripheral surface 4 are provided. The first and second structural members 3A, 5A are each configured to have a substantially L-shaped cross section including a first plate portion 3b, a second plate portion 3d, a first plate portion 5b, and a second plate portion 5d.
Moreover, the first plate portion 3b and the second plate portion 3d are formed in contact with each other in a direction substantially orthogonal to each other as shown in the longitudinal sectional view of FIG. 13, and are not fixed by welding or the like. The first plate portion 5b and the second plate portion 5d have the same configuration. The first plate portions 3b and 5b are disposed in an arc shape on the outer peripheral surface 2 and the inner peripheral surface 4, and the second plates 3b and 5d are disposed on the main girder surface in the thickness direction.
Both end portions of the first and second structural members 3 </ b> A and 3 </ b> B are connected by plate portions 3 c and 5 c located on the surface having the inter-segment joint 21 that is a surface in the thickness direction of the composite segment 1. Seal grooves 8 and 9 are formed in the second plates 3b and 5d and the plate portions 3c and 5c, respectively.
In the first and second structural members 3A and 5A, the third structural members 23 and 23 and the fourth structural members 24 and 24 each having an arcuate plate shape are connected to the inside of the first plates 3b and 5b. The opposing third structural member 23 and fourth structural member 24 are connected to each other by a lattice-shaped connecting member 26. Both end portions of the third and fourth structural members 23 and 24 are also connected to the plate portions 3c and 5c, respectively. The rest of the configuration is the same as the synthetic segment 1 according to the first embodiment.

Therefore, in the composite segment 1 according to the eighth embodiment, the corners of the four sides of the outer peripheral surface 2 and the inner peripheral surface 4 of the segment are the first and the same as the composite segment 1 according to the first embodiment. While being able to cover with the second structural members 3A and 5A and preventing chipping or cracking of the corners, achieving high strength and thinning, it is possible to achieve the effect of reducing the amount of steel used, Since the plate portions 3a and 5a are not provided, the cost of use can be further reduced by reducing the amount of components used without reducing the strength of the steel shell 25.
Moreover, since each plate part 3b, 3d, 5b, 5d which comprises 1st and 2nd structural member 3A, 5A was formed only by contact | abutting so that it may each form plate shape and a cross-sectional substantially L shape, manufacture is easy. Low cost.
The first plates 3b and 5b and the second plates 3d and 5d may be connected to each other by welding or the like.

  In the segment 1 according to the eighth embodiment, the third and fourth structural members 23 and 24 are similar to the synthetic segment 1 according to the second to sixth embodiments (see FIGS. 5 to 9). Arrangement configuration and construction configuration of water stop means (skin plate 7, water stop agent 27) can be employed. Further, a tenon 28 can be provided in the same manner as the synthetic segment 1 (see FIG. 10) according to the seventh embodiment.

In the first embodiment, the connection member 26 has a lattice-like structure in which a plurality of bowl-shaped portions are arranged obliquely. However, the shape is not necessarily limited to a shape with good filling properties of the concrete 6. There is no need, and a flat plate having a plurality of long holes may be used.
The connecting member 26 is provided to connect the third structural member 23 and the fourth structural member 24 when the steel shell 25 is disposed in the mold when the segment 1 is manufactured. Can be omitted.

Further, in the first embodiment, the skin plate 7 is mounted after the concrete 6 is placed. However, even if the skin plate 7 is installed before the placement, the skin plate 7 can be used in one direction.
Further, in the seventh embodiment, the tenon 28 is formed in the joint portion between the rings, but a tenon may be formed in the joint portion between the segments.
Further, in the seventh embodiment, the convex tenon 28a is formed on the wellhead side, and the concave tenon 28b is formed on the face side. However, the concave tenon is formed on the face side, and the convex tenon is formed on the face side. It can be formed.

It is a whole segment perspective view showing a first embodiment of the present invention. It is a schematic diagram of the AA sectional view of FIG. It is a perspective view which shows the steel shell body of the segment of 1st embodiment of this invention. It is a disassembled perspective view of the segment of 1st embodiment of this invention. It is a cross-sectional schematic diagram equivalent to FIG. 2 of 2nd embodiment of this invention. It is a cross-sectional schematic diagram equivalent to FIG. 2 of 3rd embodiment of this invention. It is a cross-sectional schematic diagram equivalent to FIG. 2 of 4th embodiment of this invention. It is a cross-sectional schematic diagram equivalent to FIG. 2 of the fifth embodiment of the present invention. It is a cross-sectional schematic diagram equivalent to FIG. 2 of the sixth embodiment of the present invention. It is a cross-sectional schematic diagram containing the ring coupling part of 7th embodiment of this invention. It is a perspective view which shows the steel shell body of the segment of 8th embodiment of this invention. It is a disassembled perspective view of the segment of 8th embodiment of this invention. It is a BB line longitudinal cross-sectional view of the synthetic segment shown in FIG.

Explanation of symbols

1 Composite segment
2 outer peripheral surface
3, 3A First structural member
3b, 5b 1st plate part 3b, 5d 2nd plate part 3a, 3c Plate part 4 Inner peripheral surface
5, 5A Second structural member 7 Skin plate (water stop means)
10 Sealing material
23 Third structural member
24 Fourth structural member
26 Connecting member
27 Water-stop agent (water-stop means)
28 Mortise

Claims (4)

A circular arc-shaped synthetic segment that forms a substantially cylindrical wall body by being connected in a plurality in the circumferential direction and the axial direction,
A first structural member having a substantially L-shaped cross-section covering the corners of the four sides of the arc-shaped outer peripheral surface;
A second structural member having a substantially L-shaped cross section covering the corners of the four sides of the arc-shaped inner peripheral surface;
A skin plate is welded to the first structural member of the outer peripheral surface by watertight welding,
Inside the first structural member on the outer peripheral surface is provided with a third structural member that is separated from the first structural member and extends in an arc shape,
A fourth structural member that extends in an arc shape separated from the second structural member is provided inside the second structural member on the inner peripheral surface,
A composite segment formed by placing concrete in a space defined by the first structural member and the second structural member. A circular arc-shaped synthetic segment that forms a substantially cylindrical wall body by being connected in a plurality in the circumferential direction and the axial direction,
A first structural member having a substantially L-shaped cross section that is formed in an arc shape along two opposing sides of an outer peripheral surface that forms an arc shape and covers corners of the two sides;
A second structural member having a substantially L-shaped cross section that is formed in an arc shape along two opposing sides of an inner circumferential surface that forms an arc shape and covers the corners of the two sides;
A skin plate is welded to the first structural member of the outer peripheral surface by watertight welding,
Both end portions of the first structural member and both end portions of the second structural member are respectively connected by plate portions located on a surface having a joint between segments,
Inside the first structural member on the outer peripheral surface is provided with a third structural member that is separated from the first structural member and extends in an arc shape,
A fourth structural member that extends in an arc shape separated from the second structural member is provided inside the second structural member on the inner peripheral surface,
A synthetic segment formed by placing concrete in a space defined by the first structural member and the second structural member.   The first structural member and the second structural member are a first plate portion formed in an arc shape along an outer peripheral surface or an inner peripheral surface, and a second plate portion formed along a surface in the thickness direction of the synthetic segment. The synthetic segments according to claim 1, wherein each is formed in contact with each other in a substantially orthogonal direction. The seal groove is formed around the surface in the thickness direction of the synthetic segment of the first structural member and the second structural member, and the sealing material is provided in the seal groove. A synthetic segment according to any of the above.

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