JPS61165496A - Segment for lining tunnel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] This invention relates to segments for tunnel lining (hereinafter referred to as "segments"), mainly of small diameter, which are buried underground and used.The purpose of this invention is to perform continuous work easily and quickly during construction. Our goal is to provide something that can be done at a low price.

Conventionally, when connecting segments, it has been common to tighten unit segments in two directions, the circumferential direction and the tunnel direction, using bolts or the like. However, particularly in the case of small-diameter segments, it is not necessarily necessary to connect them in the above two directions, and sufficient strength can be maintained even if they are connected only in one direction, i.e., in the tunnel direction.

Conventionally, when connecting segments, a method is generally known in which joint fittings are directly fastened to each other with bolts at the connecting portion. However, with this method, it takes time and effort to tighten the bolts, or when tightening the bolts, excessive force is applied to the fittings, which may cause the fittings to twist or peel off. In addition, a device in which male and female fittings are fitted and wedged has been proposed, but there is room for improvement in terms of fixing to the segment and manufacturing.

This invention was developed in view of the above circumstances.

The following description will be made based on the illustrated embodiments. Reference numeral 1 denotes a unit segment constituting the segment of the invention, and this unit segment 1 is arranged in a so-called broken joint shape in which the joints in the tunnel direction are different in difficulty from step to step.

Guide fittings 2.3 and joint fittings 4, 5 are provided near both side edges of each unit segment 1 in the circumferential direction and in the center to connect the segments in the tunnel direction. The guide fittings 2, 3 and the joint fittings 4, 5 are partially exposed and buried in both connecting end surfaces in the circumferential direction, and the fittings provided on both end surfaces are connected by anchor bars 13, 14 or reinforcing bars 8. are doing. And reinforcing reinforcing bars 8... are each joint fitting 4
, 5 are connected in a straight line parallel to the tunnel direction.

The guide fittings 2, 3 and the joint fittings 4, 5 are arranged adjacent to each other near both side edges and in the center of the unit segment.

To describe the guide fittings 2 and 3 in more detail based on FIG. 1, the male guide fitting 2 is provided with its tip protruding from one end surface in the circumferential direction of the segment, and the female guide fitting 3
has its tip flush with the other end surface of the segment, the male fitting 2 consists of a cylindrical body with a reduced diameter by squeezing the tip, and the female fitting 3 consists of a hollow cylindrical body with an inner diameter into which the male fitting 2 can be fitted. , provides guidance so that the unit segments 1 can be connected accurately.

Both guide fittings have anchor bars 13° and 14 at their rear ends.
is welded and buried in the concrete of segment 1.

As shown in FIG. 4, the guide fittings 2 and 3 have a recess 15 in the cylindrical body of the male guide fitting 2, and a bolt 17 screwed into the nut I6 provided in the hollow cylindrical body of the female guide fitting 3. It can also be used as a fitting fitted to the tip of.

To describe the fittings 4 and 5 in more detail based on FIGS. 2 and 3, the fittings 4 and 5 have a female fitting 5 on one end surface in the circumferential direction and a male fitting 4 on the opposite end surface. Insert the male joint fitting 4 into the female joint fitting 3 and drive a wedge to connect the unit segments 1 to each other.

It continues.

In other words, the female joint fitting 5 is made by bending a plate into a U-shape,
The base piece 6 at the center of the plate is flush with one end surface in the circumferential direction of the unit segment 1, and the segment 1
A horizontal, elongated insertion hole 11 is bored in the center of the base piece 6 so that it appears in a U-shape on the front and back sides of the plate, and the leg pieces 7, 7 on both sides of the plate are bent inward in the middle. The distance between the ends is narrowed, and reinforcing reinforcing bars 8 are fixed to these ends by welding or the like and buried in concrete. And the base piece 6 of the female metal fitting 5
An internal space 12 is formed within the segment 1 between the leg pieces 7, 7, and this space is open to the segment surface.

On the other hand, on the other end surface in the circumferential direction of the unit segment 1, a male metal fitting 4 made of a rod-shaped body such as a reinforcing bar bent into a U-shape is provided with its base protruding from the end surface, and extends in the direction of the front and back surfaces of the segment 1. It is represented in a U-shape.

This male metal fitting 4 is formed in such a size that a base 10 at the center thereof can be fitted into the insertion hole 11 of the female metal fitting 5, and an internal space is provided in the U-shaped portion of the base, and both sides of the male metal fitting The ends of the reinforcing reinforcing bars 8 are fixed to the legs 9, 9 by welding or the like, connected to the female fittings 5, and buried in concrete.

Then, in connecting the segments 1 and 1 in the tunnel direction, the base 10 of each male fitting 4 is connected to the base piece 6 of the female fitting 5.
A wedge 12 is inserted into the insertion hole 11 of the wedge 10 and driven between the base 10 and the base piece 7 in the internal space 12 to connect the segments 1 and 1.

At this time, the guide fittings 2, 3 and the joint fittings 4, 5 are arranged parallel to the tunnel direction and connected in a straight line, as described above.

As described above, the present invention provides male and female guide fittings and female and male joint fittings on the end faces in the circumferential direction, and these guide fittings and coupling fittings are arranged parallel to the tunnel direction and lined up in a straight line, and are connected only in the tunnel direction. Especially in small-diameter segments, the connection is performed continuously in a straight line in the direction of the tunnel, so the connection can be made with uniform force.

There is no need to worry about twisting, etc., and therefore there is no need to connect in the circumferential direction, which saves a lot of effort. Furthermore, the guide fittings and the coupling fittings consist of a female fitting and a male fitting, and by simply inserting the male fitting into the female fitting, the guide fittings will first securely position the fitting, and later the wedge will allow for reliable connection work. The connection work is easy and quick, and the fittings can be formed by simple processing using inexpensive materials.These fittings can be welded and connected to each end of the segment reinforcing bars and can be immediately placed in the formwork. Since the segment can be completed by pouring concrete, it is possible to provide an extremely practical segment for small-diameter tunnel lining, which is inexpensive to manufacture.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially fragmented plan view, FIG. 2 is a cross-sectional view showing the connection state of the fitting 2, and FIG. 3 is a vertical cross-section thereof. FIG. 4 shows a second embodiment of the guide fitting of the present invention. 1... Unit segment, 2... Male guide fitting, 3...
...Female guide fitting, 4...Male joint fitting, 5...
Female joint fitting, 6...base piece. 7... Leg piece, 8... Anchor reinforcing bar,
9... Leg, 10... Base, 11...
・Insertion hole, 12...Inner space, 13.14
...Anchor muscle, 15...Wedge. Figure 3 7 Figure 4

Claims (1)

[Claims] (1) A female guide fitting consisting of a hollow cylindrical body with an anchor reinforcing bar welded to the rear end, an insertion hole drilled in the base piece at the center of the plate body, and both sides bent into a U-shape to form a leg piece. , bend the tips of both leg pieces so as to narrow them, and attach a female joint fitting formed by welding a reinforcing bar thereto to each segment so that the tip of the hollow cylindrical body and the base piece are flush with one end surface of the segment. A male guide fitting consists of a cylindrical body that is buried in concrete, with reinforcing bars welded to the rear end and the tip squeezed to make a small diameter, and both legs are bent into a U-shape from the central base to form legs. A male joint fitting formed by welding reinforcing steel between them is buried in the concrete of the segment by protruding from the other end face of the segment so that the tip and base of the cylindrical body protrude long, and the base piece of the female fitting and An internal space opening to the surface of the segment is formed between the two leg pieces, and the cylindrical body of the male guide fitting of one of the adjacent segments is fitted into the hollow cylindrical body of the female guide fitting of one of the adjacent segments, and A wedge is driven between the base piece of the female joint fitting of the segment and the base of the male fitting of the other segment, which is inserted into the insertion hole of this base piece and projects into the internal space, and is connected to the base piece. Segment for tunnel lining.