JP3820657B2 - Tunnel segment connection structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tunnel segment connecting structure in the axial direction of a tunnel configured to connect concrete segments constituting an inner wall surface of a tunnel, that is, a concrete segment for lining in a shield method, with a coupling means such as a bolt. Is.
[0002]
[Prior art]
Generally, the concrete segments used for tunnel construction are connected to each other by connecting means such as bolts. The bolts of the connecting means are inserted into the bolt insertion holes formed in the segments and embedded in the mating segment. When screwing into a coupling tool such as a nut, an annular packing is fitted between the bolt tool and the insertion hole for waterproofing at the position of the insertion hole. This packing is usually attached integrally to a washer for the bolt device, and is fixed in the fitting hole by tightening the bolt device.
[0003]
On the other hand, each of the segments has a considerable weight, and it is difficult to stably secure the fixed positions of the segments to be joined when handling each other by coupling means such as bolts and nuts. Therefore, it is necessary to access the segments mutually and quickly screw the bolts into the fittings such as the nuts of the other segment. In this case, there is a clue for securing the fixed positions of the segments in advance. I want.
[0005]
[Problems to be solved by the invention]
[0006]
The present invention has been made on the basis of the above circumstances, and the object thereof is to project the tip of the coupler from the joint surface of the concrete segment and correspond to the bolt insertion hole of the mating concrete segment. In addition to securing a fixed position between the segments, a fitting with a tapered surface is carried out between the tip of the coupler and the tip of the packing. It is an object of the present invention to provide a tunnel segment connecting structure in the axial direction of a tunnel that can sufficiently secure a water stop effect between the walls.
[0007]
[Means for Solving the Problems]
For this reason, in the tunnel segment connection structure of the present invention, as clarified in the embodiment shown in the drawings, the concrete segments 1 are connected to each other by a coupling means 2 such as bolts. In the connection structure, the concrete segment 1 is provided with a pin-shaped or long nut-shaped coupler 3 having a screw hole 3a on its inner peripheral surface on one joint surface 1a to be joined. An insertion hole 4 is provided on the other joint surface 1b to be formed, and an insertion window 5 corresponding to each insertion hole 4 is formed on the side surface 1c so as to communicate with the proximal end side of the insertion hole 4. Yes.
[0008]
The coupling means 2 is inserted into the insertion hole 4 through the insertion window 5 and is screwed into the screw hole 3a of the coupling tool 3 of the adjacent adjacent concrete segment. inner circumferential entire surface of but when it is screwed into the screw hole 3a, and comprises a packing washer 8 for fitting the packing portion 8a into the insertion hole 4, the packing washer 8 consists of a metal washer portion 8c The outer periphery of the cylindrical packing portion 8a is fixed integrally, and the tip of the packing portion 8a protrudes from the surface of the washer portion 8c toward the coupler 3, and the entire outer periphery of the protruding portion is adjacent to the concrete segment 1, An inner peripheral tapered surface that is a member that is inserted into and inserted into the entire inner peripheral surface of the insertion hole 4 that faces each other at the time of close-contact bonding , and that guides the tip of the connector 3 when the bolt device 7 is connected. 8b It is formed on the inner periphery of the packing unit 8a.
[0009]
In this case, the coupling tool 3 is preferably provided with a tapered surface 3c on the inner peripheral edge of the tip for guiding the tip of the bolt tool 7 to the nut 3a.
[0010]
Therefore, when the concrete segments 1 and 1 are accessed for joining, the tip of the coupler 3 is guided into the insertion hole 4 to provide a clue to secure the fixed positions of the concrete segments 1 and 1. The packing portion 8a of the packing washer 8 is moved into the insertion hole 4 by tightening (screwing operation) of the bolt 7 when the bolt is joined to the tip of the packing portion 8a of the washer 8 with packing. In this state, the tip of the packing portion 8a is inclined toward the inner wall side of the insertion hole 4 and is in close contact with each other, so that a sufficient water stop effect can be secured.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which a tunnel segment connection structure of the present invention is applied to tunnel construction work in a shield construction method will be described in detail with reference to the drawings. This connection structure is configured such that the concrete segments 1 for lining in the shield method are connected to each other in the axial direction of the tunnel by a coupling means 2 such as a bolt.
[0012]
The concrete segment 1 is provided with a coupling tool 3 having a screw hole 3a on its inner peripheral surface on one joint surface 1a to be joined, and an insertion hole on the other joint surface 1b to be joined. 4, and an insertion window 5 corresponding to each insertion hole 4 is formed on the side surface 1c (becomes the inner surface of the tunnel) so as to communicate with the proximal end side of the insertion hole 4. In this embodiment, the insertion hole 4 is formed in the metal plate 6 embedded in the concrete segment 1 so as to constitute one surface of the insertion window 5. The coupler 3 is a pin-shaped, screw-cylinder-shaped, or long nut-shaped member.
[0013]
The coupling means 2 includes a bolt device 7 and a washer 8 with packing. The bolt device 7 is inserted into the insertion hole 4 through the insertion window 5 and coupled to the adjacent adjacent concrete segments. Screwed into the screw hole 3 a of the tool 3. Moreover, the washer 8 with packing is prepared so that the packing part 8a may be fitted into the insertion hole 4 before the bolt 7 is screwed into the screw hole 3a.
[0014]
The washer 8 with packing is a member in which a cylindrical packing portion 8a is integrally fixed to the inner peripheral surface of a metal washer portion 8c, and the tip of the packing portion 8a is directed from the surface of the washer portion 8c toward the coupler 3. It is protruding. The packing portion 8a is formed of a normal rubber material, water-expandable rubber, or elastomer. Further, the washer 8 with packing is formed with an inner peripheral tapered surface 8b for guiding the tip of the coupler 3 when the bolt 7 is coupled to the inner peripheral edge of the packing portion 8a. As in the embodiment, an outer peripheral tapered surface 3b corresponding to the inner peripheral tapered surface 8b is formed on the outer peripheral edge of the tip of the coupler 3.
[0015]
In the case of this embodiment, a chamfer 7a is formed at the insertion tip of the bolt tool 7, and the coupling tool 3 is an inner peripheral tapered surface 3c for guiding the tip of the bolt tool 7 to the screw hole 3a. Is provided at the inner peripheral edge of the tip. Furthermore, it is preferable that a part of the internal rebar (not shown) of the concrete segment 1 is coupled to the coupler 3 by means such as welding.
[0016]
In such a configuration, when the concrete segments 1 and 1 are accessed for joining, the distal end of the coupler 3 is guided into the insertion hole 4 to secure the fixed positions of the concrete segments 1 and 1. As a clue, the packing portion 8a of the packing washer 8 of the packing washer is tightened (screwing operation) by tightening (screwing operation) the bolt member 7 at the time of bolt connection by the action of the inner peripheral tapered surface 8b formed thereon. In a state where it is fixed in the insertion hole 4, the tip of the packing portion 8 a is inclined toward the inner wall side of the insertion hole 4, and the water stop effect can be sufficiently secured.
[0017]
The above-described washer 8 with packing is not limited to the configuration of the embodiment, and as long as a tapered surface is formed on the inner peripheral edge of the packing portion 8a, for example, as shown in FIG. Of course, various cross-sectional shapes may be used. In the figure, reference numeral 9 denotes a waterproof band-shaped packing member that is fitted in a groove shape formed on the joint surface (four surfaces) of the concrete segment 1.
[0018]
【The invention's effect】
As described in detail above, the present invention provides an insertion hole formed on the other joint surface of the mating concrete segment with the tip of the pin-like coupler having a screw hole projecting from one joint surface of the concrete segment. Since the bolt is screwed into the screw hole from the side of the mating concrete segment through the washer with packing and inserted into the screw hole, the fixed position between the segments can be secured easily and accurately. Can do.
[0019]
Further, insertion fitting with a taper surface is performed between the outer peripheral taper surface at the tip of the coupler and the inner taper surface of the packing portion of the washer with packing. By inserting and fitting between the tips, it is possible to more easily and accurately secure the fixed positions of the segments, and when the bolts are tightened, the inner wall surfaces of the fitting holes by packing A sufficient water-stopping effect can be secured.
Further, the washer 8 with packing has the tip of the packing portion 8a having an inner peripheral tapered surface 8b on the inner periphery thereof protruding from the surface of the washer portion 8c in the direction of the coupler 3, and the inner periphery of the metal washer portion 8c. Since the cylindrical packing portion 8a is integrally fixed to the surface, the handling is easy and the insertion fitting operation with the coupler 3 is also easy. Further, even if there is a slight mismatch between the protruding interval of the coupler protruding at a plurality of predetermined intervals and the interval between the opposing insertion holes, the mismatch is caused by compressive deformation in the width direction of the packing portion 8a. It can be adjusted, the on-site insertion fitting work is further facilitated, and the water stop effect can be sufficiently ensured.
[Brief description of the drawings]
FIG. 1 is a partially broken perspective view showing a structure of a segment as an embodiment of the present invention.
FIG. 2 is a longitudinal side view in which main parts are exploded in the same manner.
FIG. 3 is a longitudinal sectional side view of a main portion joined in the same manner.
FIG. 4 is a longitudinal sectional view showing a modified example of the main part.
FIG. 5 is a schematic perspective view in which a tunnel structure is similarly formed by coupling segments.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Concrete segment 1a, 1b One and the other joining surface 1c Side surface 2 Coupling means 3 Coupling tool 3a Screw hole 3b, 3c Tapered surface 4 Insertion hole 5 Insertion window 6 Metal plate 7 Bolt tool 7a Chamfering 8 Washer 8a with packing Packing part 8b Tapered surface 8c washer

Claims (2)

In the connection structure of the segment for tunnel which comprised the concrete segment which comprises the inner wall face of a tunnel mutually connected by a coupling means,
The concrete segment (1) has a plurality of couplers (3) having screw holes (3a) on the inner peripheral surface projecting at predetermined intervals on one joint surface (1a) to be joined. An insertion hole (4) is provided in the other joint surface (1b) to be joined, and each side of the insertion hole (4) is communicated with the base end side of the insertion hole (4) on the side surface. Forming a corresponding insertion window (5),
The coupling means (2) is inserted into the insertion hole (4) through the insertion window (5) and screw holes (3a) of the coupling tool (3) of the adjacent concrete segment (1) facing each other. ) And a packing for fitting a packing portion (8a) into the insertion hole (4) when the bolt tool (7) is screwed into the screw hole (3a). With washer (8),
The packing washer (8), the inner circumferential entire surface to the cylindrical packing portion of the metal washer portion (8c) is fixed integrally the outer periphery of (8a), the distal end of the packing unit (8a) is washer portion (8c) projecting from the surface in the direction of the coupler (3), and the entire outer periphery of the projecting portion is entirely within the insertion hole (4) facing when the adjacent concrete segments (1, 1) are closely joined to each other A taper surface (8b) that guides the tip of the coupling tool (3) when the bolting tool (7) is joined, and is joined to the peripheral surface and is inserted into the inner periphery of the packing portion (8a). A connection structure for a tunnel segment, characterized in that it is formed as follows.   2. The tunnel segment connection structure according to claim 1, wherein the coupling tool includes a tapered surface on the inner peripheral edge of the tip for guiding the bolt tool tip to the screw hole.

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