JP3823142B2 - Shield lining segment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shield lining segment, and more particularly to a segment having corrosion resistance.
[0002]
[Prior art]
Conventionally, joining of segments is generally performed using a joint member such as a bolt on the inner surface of the segment, and hardware such as bolts and bolt boxes are exposed on the inner surface of the segment. ,
(1) Remove exposure of hardware by secondary lining, or
(2) Covering exposed portions of hardware with a resin or the like.
[0003]
[Problems to be solved by the invention]
However, when constructing a secondary lining, there are problems such as a large tunnel cross section, a long construction period, and high construction costs. In the case of covering with a resin or the like, there is a problem in that it takes time for construction. In addition, even if there is no exposure of hardware due to secondary lining or resin coating, concrete itself corrodes with bacteria if it is used in a poor environment such as a sewer pipe (eg, generated from sewage). Hydrogen sulfide is converted into sulfuric acid by sulfur-oxidizing bacteria, and sulfuric acid reacts with calcium in cement).
[0004]
It is an object of the present invention to provide a shield lining segment that does not require secondary lining or resin coating for preventing corrosion of joint members, and that can prevent corrosion of the concrete of the segment itself.
[0005]
The shield lining segment of the present invention is configured as follows in the shield lining segment in which the segment bodies 1 are joined to each other by the joint member 2 at the ring joint surface 1a which is the end surface in the tunnel axis direction. It is characterized by.
[0006]
The joint member 2 is a U-shaped steel material in which pin portions 4 are integrally projected at both ends of a connecting portion 3 that is curved along the arc of the ring joint surface 1a.
The segment main body 1 is made of concrete to which an antibacterial agent is added, and the pin portion 4 of the joint member 2 is fitted to each of the ring joint surfaces 1a on both sides near the piece joint surface 1b which is the end surface in the tunnel circumferential direction. A joint hole 5 having a depth that can be fitted and a groove 6 having a depth capable of fitting the connecting portion 3 of the joint member 2 are provided so as to reach the piece joining surface 1b from the joint hole 5.
The piece joint surfaces 1b of the segment main bodies 1 are butted together so that the grooves 6 of the two segment main bodies 1 are continuous on the ring joint surfaces 1a on both sides, and the joints on the ring joint surfaces 1a on both sides of the two segment main bodies 1 are connected. By fitting the pin portions 4 at both ends of the joint member 2 into the holes 5 and fitting the connecting portions 3 of the joint member 2 into the continuous grooves 6, the joint member 2 does not protrude from the ring joint surface 1a. The segment main bodies 1 are joined to each other by the joint member 2 on the ring joint surfaces 1a on both sides in a state of being completely accommodated within the thickness of the segment 1.
[0007]
In the case of providing a grout hole penetrating from the inner surface to the outer surface of the segment body, a short metal tube has been embedded in the past. By constructing, the corrosion in the grout hole is also prevented.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings.
[0009]
FIG. 1 shows an embodiment of a connecting portion between two segment bodies 1 in the same ring. Each segment body 1 is made of concrete to which an antibacterial agent is added. The antibacterial agent to be added is an inactive compound made of a metal or metal oxide that inhibits the growth of bacteria but does not affect the physical properties of the concrete. The target bacteria is a sulfur-oxidizing bacterium as described above. In some cases, nickel fine powder is used and added during concrete kneading.
[0010]
In this example, when connecting the concrete main bodies 1 to each other, two joint members 2 made of U-shaped steel are used for each ring joint surface 1a on the ring joint surface 1a which is an end surface in the tunnel axis direction. Each joint member 2 is obtained by integrally projecting a pin portion 4 at both ends of a connecting portion 3 at a right angle. In the example shown in the figure, the connecting portion 3 has a plate shape and is slightly curved along the arc of the ring joint surface 1a of the segment body 1, but both the pin portions 4 protrude straight in a circular cross section.
[0011]
Two joint holes 5 are provided in the ring joint surfaces 1a on both sides of each segment body 1 near the piece joint surface 1b which is the end surface in the circumferential direction of the tunnel. Two grooves 6 each reaching the surface 1b are provided. The joint hole 5 has a depth at which the pin portion 4 of the joint member 2 can be fitted, and the groove 6 has a depth at which the connecting portion 3 of the joint member 2 can be fitted.
[0012]
The segment main body 1 having the grout hole 7 is configured such that the grout hole 7 embeds a short tube 8 of a resin FRP containing reinforcing fibers in the concrete of the segment main body 1. Therefore, since the hole wall of the grout hole 7 is made of a resin containing reinforcing fibers, the conventional grout hole 7 does not corrode.
[0013]
In FIG. 1, the piece joint surfaces 1 b of the segment main bodies 1 are abutted to each other so that two sets of grooves 6 of the two segment main bodies 1 are connected to each other. When the pin portions 4 of the two joint members 2 are respectively fitted to each other, and when the connecting portions 3 of the joint members 2 are respectively fitted to the continuous grooves 6, the segment main bodies 1 are connected to each other on the ring joint surfaces 1a on both sides. Coupled by the joint member 2.
[0014]
In this state, the joint member 2 is not exposed to the segment inner surface 1c but exposed to the ring joint surface 1a, but does not protrude from this surface and is completely contained within the thickness of the segment 1, so Can prevent corrosion. In the joint member 2, the connecting portion 3 connects the segment main bodies 1, and the pin portions 4 at both ends serve as a shaft that allows displacement in the tunnel inside and outside directions between the connected segment main bodies 1. In other words, it becomes a form like an elastic joint.
[0015]
The embodiment shown in FIG. 2 differs from FIG. 2 in that one joint member 2 is used for each ring joint surface 1a. The number of joint members 2 to be used for each ring joint surface 1a can be arbitrarily selected in consideration of the rigidity as a joint.
[0016]
In the embodiment shown in FIG. 3, the connecting portion 3 of the joint member 2 has a square cross section, and the groove 6 of the ring joint surface 1a of the segment body 1 has a depth corresponding to the connecting portion 3 having the square cross section. This is different from the first embodiment. Also in this case, two joint members 2 are used for each ring joint surface 1a.
[0017]
The embodiment shown in FIG. 4 is different from the embodiment shown in FIG. 3 in that the connecting portion 3 uses one joint member 2 having a square cross section for each ring joint surface 1a.
[0018]
【The invention's effect】
As described above, according to the present invention, the segment main body is made of antibacterial concrete, and the segments are joined to each other at the ring joint surface so as not to expose the joint member to the inner surface of the segment. Secondary lining and resin coating are unnecessary, and corrosion of the segment concrete itself can be prevented. Accordingly, the cost for maintaining and repairing the shield tunnel can be reduced, and the secondary lining can be omitted to reduce the construction period and cost.
[0019]
Further, by forming the wall of the brout hole with a corrosion-resistant material such as plastic, corrosion at the grouting hole can be prevented.
[Brief description of the drawings]
FIG. 1 is a perspective view of an embodiment of the present invention using two U-shaped joint members.
FIG. 2 is a perspective view of an embodiment in which one U-shaped joint member is used.
FIG. 3 is a perspective view of a modified example with respect to FIG. 1;
4 is a perspective view of a modified example with respect to FIG. 2. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Segment 1a Ring joint surface 1b Piece joint surface 2 Joint member 3 Connection part 4 Pin part 5 Joint hole 6 Groove 7 Grout hole 8 Short tube of resin containing reinforcing fiber

Claims (2)

In the shield lining segment for joining the segment main bodies (1) to each other by the joint member (2) at the ring joint surface (1a) which is the end surface in the tunnel axis direction,
The joint member (2) is a U-shaped steel material in which pin portions (4) are integrally projected at both ends of a connecting portion (3) that is curved along the arc of the ring joint surface (1a).
The segment body (1) is made of concrete to which an antibacterial agent is added, and the joint member is located near the piece joint surface (1b) which is an end surface in the tunnel circumferential direction on each of the ring joint surfaces (1a) on both sides thereof. A joint hole (5) having a depth capable of fitting the pin portion (4) of (2) is provided, and a depth of fitting the coupling portion (3) of the joint member (2) is provided. Providing the groove (6) so as to reach the piece joint surface (1b) from the joint hole (5),
The piece joint surfaces (1b) of the segment bodies (1) are butted together so that the grooves (6) of both segment bodies (1) are continuous in the ring joint surfaces (1a) on both sides, and the segment bodies (1) In each of the ring joint surfaces (1a) on both sides, the pin portions (4) at both ends of the joint member (2) are fitted into the joint holes (5), respectively, and the joint member (2 ), The joint member (2) does not protrude from the ring joint surface (1a) and is completely within the thickness of the segment (1). 1) A shield lining segment characterized in that the joint members (2) are joined to each other at the ring joint surfaces (1a) on both sides.   The grout hole (7) penetrating from the inner surface to the outer surface of the segment body (1) is constructed by embedding a short tube (8) of a corrosion-resistant material such as plastic in concrete. Shield lining segment as described.

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