JP4083758B2 - segment - Google Patents

Description

  The present invention relates to a segment having a seal groove that is joined together to construct a structure such as a tunnel lining body.

The segments used for constructing the tunnel by the shield method are generally plate-shaped curved in an arc shape, and are connected to each other by joint members such as bolts in a state where the adjacent segments and the joining end faces are in contact with each other. A tunnel lining body is constructed by sequentially joining.
As the segments used in the shield method, there are known three types of segments: RC (reinforced concrete) segments, steel (steel) segments, and composite segments using a combination of steel (steel) and concrete. Among these segments, the RC segment has a shape in which the filled concrete is exposed and exposed on the outer surface (see, for example, Patent Document 1).

A concrete (RC) segment described in Patent Document 1 is shown in FIG. The segment 51 shown in FIG. 6 is formed into a plate shape that forms an arc with concrete. A segment main body 54 having a curved outer peripheral surface 52 and an inner peripheral surface 53 is inserted into the center on the inner peripheral surface 53 side of each joining end surface 55 along the width direction (axial direction) and the length direction (circumferential direction). A plate-shaped joint fitting 57 having a hole 56 is embedded. A joint recess 58 for bolt connection is formed in the segment main body 54 corresponding to the inner side of the joint fitting 57.
Then, the joint end surface 55 of one segment 51 and the joint end surfaces 55 of the other segments 51 adjacent thereto are brought into contact with each other, and bolts are inserted from the joint recesses 58 of one segment 51 into the bolt insertion holes 56 facing each other. The adjacent segments 51 are joined to each other by fastening the bolts from the other joint recess 58 with a nut and connecting the joint fittings 57 to each other.
As for the concrete segment 51, the joint end surface 55 which makes four side surfaces with the inner and outer peripheral surfaces 53 and 52 is made into the outer surface of concrete.

Each joint end face 55 of such a concrete segment 51 is provided with a seal groove for the purpose of water stopping. As shown in FIG. 7, the segment 51 has seal grooves 62 and 62 formed in the vicinity of the corner on the outer peripheral surface 52 side and the corner near the inner peripheral surface 53 side of the joint end surface 55 made of concrete, respectively. Will be installed. By providing the seal grooves 62 and 26 at two locations on the outer peripheral side and the inner peripheral side of the joining end surface 55, the water stop effect can be enhanced.
In particular, the joint strength of each segment 51 is improved by providing a tenon H (indicated by a two-dot chain line) consisting of a convex part and a concave part that can be fitted to each other at the center part in the thickness direction of the two joining end faces 55 and 55 facing each other. it can.
JP 7-317497 A

However, in the conventional concrete segment 51, for example, when a tunnel is excavated by a shield method, when the excavator is pressed against the ground with a propulsion jack, the reaction force is taken by the segment 51 incorporated in a cylindrical shape or the like. For this reason, there is a drawback that cracks and cracks C are likely to occur due to stress concentration in the seal groove 62 portion where the strength of the segment 51 is inferior due to the repulsive force of the jack thrust. Further, since the concrete segment 51 expands by absorbing groundwater or the like, there is a possibility that cracks and chips C may occur in the seal groove 62 due to the repulsive force of the jack thrust.
In particular, in order to increase the joint strength between the segments 51, if a tenon H is provided at the center of the joint end surface of the segments 51, the seal groove 62 is formed at the vicinity of the corners on the outer peripheral surface side and the inner peripheral surface side of the joint end surface 55. Therefore, there is a problem that the strength of the corner portion is reduced and the seal groove 62 is more likely to be cracked or chipped.

  In view of such circumstances, an object of the present invention is to provide a segment in which the strength of a seal groove provided on a joint end surface made of concrete can be increased to prevent occurrence of cracks, chips, and the like. .

The segment according to the present invention is formed by casting and filling concrete into a formwork so that the concrete is curved into an arc plate shape with the concrete as the main material, and the joint end surface provided in the circumferential direction and the axial direction is a concrete surface. a segment in the segments are joined together by joining end face build a tunnel lining member, the joining end face and the metal member is provided to form a seal groove along its length, the metal member A water-stopping material is connected to the back of the concrete.
According to the present invention, the seal groove provided on the joint end surface forming the concrete surface has high strength because it is formed on the metal member provided on the joint end surface, and even if the joint end surface and the segment are formed of concrete. Furthermore, even if the segment is water-expanded, it is possible to prevent the recess-shaped seal groove from being cracked or chipped due to the repulsive force of the jack thrust.
In addition, the segment which uses concrete as a main material includes the synthetic segment in which a concrete segment and at least a joining end surface are formed with a concrete surface. Further, since the disposed back surface (or the back surface end portion side of the skin plate) in the water stopping material of the metal member, can be prevented from leakage between the concrete.

In addition, a tenon may be provided at the center portion in the thickness direction of the joining end surface, and a metal member having seal grooves formed on both sides or one side thereof may be provided.
By providing a tenon on the joint end face, the seal groove is further positioned near the corner of the segment, but since it is formed on the metal member, the strength of the segment can be secured, and the load such as the repulsive force of the jack thrust It can prevent cracking and chipping even under stress.
The segment is preferably a concrete segment or a synthetic segment. In this case, the concrete segment has not only the joining end face but also the segment main body made of concrete, and the composite segment has the joining end face formed of a concrete surface even if it has a steel shell. Even in these cases, since the strength of the seal groove is high, even if the seal groove is located in the vicinity of the corner portion of the joining end face, cracks and chips from the seal groove do not occur.

According to the segment of the present invention, even if the joint end surface is a concrete surface, the strength of the seal groove is high, and it is possible to prevent the seal groove from being cracked or chipped due to the repulsive force of the jack thrust. And since the water stop material was arrange | positioned in the back surface of a metal member, it can prevent leaking between concrete.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1 and 2 are diagrams showing a segment according to the first embodiment. FIG. 1 is an overall perspective view of the concrete segment, and FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG.
The segment 1 according to the present embodiment forms a tunnel covering body constructed on the inner wall of a road tunnel having a large cross section by, for example, a shield method, and a substantially rectangular plate shape made of a thin wall has a substantially cylindrical peripheral surface shape. The segment main body 1A is curved by being curved (hereinafter referred to as an arc plate shape). The segment body 1A constitutes a so-called concrete (RC) segment by placing and filling the concrete 3 with reinforcing bars (not shown) arranged in the form of the segment.

And the peripheral surface of the thickness direction of the segment 1 is comprised by each pair of short side surface and long side surface. The joint surface 4 which is the side surface on the short side is provided with an inter-segment joint 5 for joining in the circumferential direction of the tunnel. The inter-segment joint 5 connects the relay joint portion 5a and the insert joint portion 5b in the length direction. Have.
Further, for example, four male portions 7a of the inter-ring joint 7 for joining in the axial direction of the tunnel are provided on the main girder surface 6 which is the long side surface, and the main girder surface 6 (the rear side in FIG. ) Is provided with the same number of female portions 7b that are fitted to the male portions 7a.
The inter-ring joint 7 is constituted by a push grip, for example. As shown in FIG. 2, the male portion 7a includes a pin bolt 25, a cap nut portion 26, an anchor bar 27, and the like, and the female portion 7b engages with the pin bolt 25. A wedge portion 28 to be stopped, an anchor bar 29, and the like are provided.
The outer surface of the concrete segment 1 is formed by the outer peripheral surface 10 that forms the ground side at the time of tunnel formation, the inner peripheral surface 11 on the inner air side, each pair of joint surfaces 4 and the main girder surface 6, and each constitutes a concrete surface. .

Further, on the joint surface 4 and the main girder surface 6 made of concrete, for example, plate-like metal members 22 and 23 are respectively provided along the corners in the vicinity of the corners on the outer peripheral surface 10 side and the inner peripheral surface 11 side. A pair is buried. The surfaces of the metal members 22 and 23 are exposed to the outside so as to be substantially flush with the joint surface 4 and the main girder surface 6, and concave groove-shaped seal grooves 20 and 21 are formed along the longitudinal direction thereof. ing. The metal members 22 and 23 are made of, for example, steel, but may be made of other metal members having corrosion resistance.
In this case, the seal grooves 20 and 21 have the same height in the thickness direction of the segment 1 so that the vertical seal groove 20 on the joint surface 4 side and the vertical seal groove 21 on the main girder surface 6 side communicate with each other. It is arranged at the vertical position.
In addition, a water-stopping material 19 such as rubber is adhered to the back surface of each metal member 22, 23 between the concrete 3. The water stop material 19 extends linearly along the longitudinal direction of the metal members 22 and 23, and the water stop material 19 provided on the back surface of each metal member 22 and 23 with the main girder surface 6 and the joint surface 4, respectively. , 19 are located at the same height so as to be connected.

  In order to manufacture the segment 1 according to the present embodiment, a metal member 22 having a seal groove 20 and a metal member 23 having a seal groove 21 are prepared in advance, and these metal members 22 and 23 are used as segment molds (illustrated). Not on the side. Further, after setting the reinforcing bars in a predetermined position in the mold, the concrete 3 is filled in the mold. As a result, the metal member 22 with the seal groove 21 embedded in the joint surface 4 along the length direction and the metal member 23 with the seal groove 21 embedded in the main girder surface 6 along the length direction thereof. Are formed.

Since the concrete segment 1 according to this embodiment has the above-described configuration, a tunnel lining body is constructed by joining a plurality of segments 1 in a state adjacent to each other in the circumferential direction and the axial direction. Moreover, between the seal grooves 20 and 21 formed in the joint surface 4 and the main girder surface 6 of one segment 1 and the seal grooves 20 and 21 of the joint surface 4 and the main girder surface 6 of the adjacent segment 1. Each sealing material is attached.
In this case, since the seal grooves 20 and 21 are respectively formed in the metal members 22 and 23 in the joint surface 4 and the main girder surface 6 of each segment 1, the seal is directly sealed on the joint surface 4 and the main girder surface 6 made of concrete. Unlike the conventional technology in which grooves are provided, the strength and rigidity of the segment 1 can be ensured without causing cracks or chipping even when load or stress is concentrated in the seal grooves 20 and 21 due to the repulsive force of the jack thrust. It is possible to efficiently construct a tunnel lining body in which the segment 1 is incorporated into a cylindrical shape, for example, so that the waterproofness and strength can be ensured.
In addition, since the water-stopping material 19 is provided between the metal members 22 and 23 and the concrete 3, groundwater or the like leaks between the metal members 22 and 23 and the concrete 3. It is possible to prevent deterioration, chipping, cracking, etc. of the concrete segment 1.

Next, other embodiments and modified examples of the present invention will be described, but the same reference numerals are used for the same or similar members and parts as those of the segment 1 according to the above-described embodiment, and the description will be omitted.
3 and 4 show a synthetic segment according to the second embodiment. FIG. 3 is a sectional view of the synthetic segment similar to FIG. 2, and FIG. 4 is a perspective view showing a steel shell of the synthetic segment.
3 and 4, the composite segment 30 according to the present embodiment has a configuration in which the concrete 3 and the steel material are used in combination.
As for the steel shell 2 which comprises the structure of the synthetic | combination segment 30, the plate-shaped steel materials 15 and 15 are each provided in the outer peripheral surface 10, respectively, for example, the plate-shaped steel materials 16 and 16 are provided in the inner peripheral surface 11, respectively. . These steel materials 15, 15 and 16, 16 are opposed to each other in the thickness direction of the steel shell 2, and are connected to each other by a lattice (connection member) 18 so as to form, for example, a substantially V shape. A plurality of lattices 18 are continuously arranged along the length direction of the main girder surface 6.
The composite segment 30 is configured such that each side surface of the steel shell 2, that is, the joint surface 4 and the main girder surface 6 are covered with concrete (see FIG. 3). Therefore, like the first embodiment, the joint surface 4 and the main girder surface 6 constitute a concrete surface formed of concrete. A skin plate 24 is welded to the steel materials 15 and 15 on the outer peripheral surface 10 of the composite segment 30 by watertight welding.

Also in this synthetic segment 30, the joint surface 5 which has the relay joint part 5a and the insert joint part 5b is provided in the joint surface 4 similarly to 1st embodiment. The main girder surface 6 is also provided with, for example, four male portions 7a of the inter-ring joint 7, and the opposing main girder surface 6 is provided with a female portion 7b that fits the male portion 7a.
The joint surface 4 and the main girder surface 6 are provided with a metal member 22 having a seal groove 20 and a metal member 23 having a seal groove 21 along the length direction. A pair of these metal members 22 and 23 are provided in the vicinity of the corners of the joint surface 4 and the main girder surface 6, respectively. A water stop material 19 is attached to the back surface of each metal member 22, 23.
Further, on the back surface in the vicinity of the four sides forming the end of the skin plate 24, linear water-stopping materials 37 are respectively attached to the concrete 3 in the same manner as the metal members 22 and 23, and are connected so as to form, for example, a quadrangle. Has been. This also prevents intrusion of groundwater or the like between the skin plate 24 and the concrete 3.
The synthesized segment 30 according to the present embodiment also has the same effects as the first embodiment.

Next, a modification of the embodiment of the present invention will be described with reference to FIG.
In the synthetic segment 33 shown in FIG. 5, in addition to the configuration of the synthetic segment 30 according to the second embodiment described above, in order to increase the joint strength between the segments, the main girder surface 6 (and the joint surface 4) which is the joint end surface is provided. On one side, a fitting convex portion 34 is provided at an intermediate portion between the seal groove 21 and the seal groove 21. On the other side of the main girder surface 6 (and the joint surface 4), a fitting recess 35 is provided at an intermediate portion between the seal groove 21 and the seal groove 21. The fitting convex part 34 and the fitting concave part 35 can be fitted to each other and constitute a tenon.
When joining the composite segments 33, 33, apart from the joint member composed of the inter-segment joint 5 and the inter-ring joint 7, the fitting convex portion 34 of one synthetic segment 33 and the fitting concave portion 35 of the other synthetic segment 33 are used. The joint strength between the synthetic segments 33 and 33 can be increased by fitting them.
As shown in FIG. 5, in the composite segment 33, the metal member 23 (and the seal) provided with the seal groove 21 by providing the fitting convex part 34 or the fitting concave part 35 on the main girder surface 6 (and the joint surface 4). The metal member 22) provided with the groove 20 is buried in a position closer to the corner portion side. Even in this case, the composite groove 33 is formed by forming the seal grooves 21 and 20 in the metal members 23 and 22. High strength can be maintained.
Therefore, also in this modification, the intensity | strength equivalent to the segment 1 by each above-mentioned embodiment and the synthetic | combination segment 30 can be obtained.
A tenon may be employed in the concrete segment 1 according to the first embodiment.

As an example of the synthetic segment 30 according to the second embodiment, the steel shell 2 is composed of the steel materials 15, 16 and the lattice 18. However, the lattice 18 may be omitted, and the steel material may have various shapes other than those illustrated. It can be formed and configured, and is not limited to the illustrated example. Even in this case, the joint surface and the main girder surface may be surfaces formed of concrete.
Further, in each of the above-described embodiments and modifications, two metal members 22 and 23 having the seal grooves 20 and 21 are provided on the joint surface 4 and the main girder surface 6, but one metal member may be provided.
In each embodiment, the metal members 22 and 23 having the seal grooves 20 and 21 can be of any shape. In the illustrated embodiment, an example in which a tunnel lining body provided in a road tunnel with a large cross section is constructed is shown. However, a relatively small diameter tunnel lining body such as for piping is used. It can also be applied as a segment to construct

It is a perspective view of the concrete segment by a first embodiment of the present invention. It is an AA line expanded sectional view of FIG. It is sectional drawing corresponding to FIG. 2 which shows the synthetic | combination segment by 2nd embodiment. It is a perspective view which shows the steel shell of the synthetic | combination segment shown in FIG. It is sectional drawing similar to FIG. 3 of the synthetic | combination segment by a modification. It is a perspective view of the conventional segment. It is an expanded sectional view which shows the main girder surface of the segment shown in FIG.

Explanation of symbols

1 Segment 4 Joint surface (joint end surface)
6 Main girder surface (joint end surface)
19, 37 Water blocking material 20, 21 Seal groove 22, 23 Metal member 30, 33 Composite segment
34 Fitting projection (mortise)
35 Fitting recess (mortise)

Claims (2)

By placing and filling the concrete into the mold , the segment is formed by bending the concrete as a main material into a circular arc plate shape, and the joint end surface provided in the circumferential direction and the axial direction is a concrete surface, in the segments are joined together by joining end face build a tunnel lining member,
Wherein the joining end face and the metal member is provided to form a seal groove along its length, and wherein the the back surface of the metal member water stopping material is connected between the concrete To be segmented. The segment according to claim 1, wherein a tenon is provided in a central portion in the thickness direction of the joining end face, and a metal member in which the seal groove is formed on both sides or one side thereof.

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