JPH0270896A - Concrete segment - Google Patents

Abstract

PURPOSE:To conduct tunnel lining having high strength by forming irregularity sections formed to a trapezoidal shape and mutually engaged with the circumferential end sections of a tunnel and installing a bonding fitting and an insert fitting mutually interlinked with the longitudinal end sections of the tunnel. CONSTITUTION:A concrete segment 1 is formed to an equilateral trapezoidal shape slightly long in the cross direction, and mutually engaged recessed section 2 and protruding section 3 are formed at edge end sections in the circumferential direction of the concrete segment. A bonding fitting 4 is projected at one end of a cross edge end, an insert fitting 5 is buried to the other end, and a grout hole 6 for back-filling is shaped at an approximately central section. Consequently, the formed segments 1 are mounted continuously while interlinking the recessed sections 2 and the protruding sections 3 alternately in the circumferential direction of a tunnel, and set up continuously while engaging the bonding fittings 4 and the insert fittings 5 in the longitudinal direction of the tunnel. Internally winding concrete 9 is placed inside a segment ring assembled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to concrete segments.

[Conventional technology]

Generally, in the shield method, the inner periphery of the tunnel is often lined with concrete segments.

Since concrete segments are to be assembled inside a tunnel, it is desirable that they have a shape that is easy to assemble.

It also needs to have sufficient strength to withstand the collapse of other mountains.

[Problem to be solved by the invention]

However, although concrete segments with various shapes have been developed, most of them have uneven parts on the periphery that engage with each other in order to ensure the connection of the segments after assembly. Many are formed. Therefore, the formwork has a complicated shape and is generally difficult to manufacture. Furthermore, the inner periphery of a tunnel is often lined with a combination of several types of concrete segments, and the segments must be connected to each other using connection bolts, etc., making assembly extremely troublesome.

This invention was proposed in order to solve the above-mentioned conventional problems, and it is easy to manufacture, the inner circumference of the tunnel can be lined simply with one type of segment, and it has high strength. The purpose is to provide a concrete segment that can perform high tunnel lining.

[Means to solve the problem]

This invention relates to a concrete segment that is installed continuously in the circumferential direction and longitudinal direction of a tunnel, and is formed into a trapezoidal shape, and has concave and convex portions that engage with each other at the circumferential ends of the tunnel. The above object is achieved by providing a joining fitting and an insert fitting that engage with each other at the longitudinal ends of the device.

〔Example〕

Hereinafter, the present invention will be described based on an illustrated embodiment. A concrete segment 1 is formed into a trapezoidal shape that is slightly elongated in the lateral direction, and recesses 2 that engage with each other are formed at the edges in the circumferential direction. A convex portion 3 is formed, and a joining fitting 4 is protruded from one end of the widthwise edge, and an insert fitting 5 is embedded in the other end.

Further, a grout hole 6 for backfilling is formed approximately in the center of the concrete segment 1.

The concave portion 2 and the convex portion 3 are formed continuously in the width direction of the concrete segment 1.

The joining fitting 4 is formed into a circular or rectangular shape, with a tapered tip, and a temporary spring-like spring on the side surface.
- Two to four flanges 7, 7 are provided protrudingly.

Furthermore, the joint fitting 4 is firmly anchored by welding or the like to the reinforcing bars in the concrete of the concrete segment 1.

Similar to the joining fitting 4, the insert fitting 5 is also anchored to the reinforcing bars in the concrete of the concrete segment 1 by welding or the like.

A hole 5a is formed in the insert metal fitting 5. The hole 5a corresponds to the shape of the joining metal fitting 4 and has an inner diameter such that the joining metal fitting 4 can be inserted therein.

On the inside of the hole 5a, locking portions 8, 8 are formed on which the stopper 7.7 is caught when the joining metal fitting 4 is inserted into the hole 5a. With this configuration, once the joining fitting 4 is inserted into the insert fitting 5 and connected, the segments connected in the longitudinal direction of the tunnel will not easily come off and will be reliably connected.

The concrete segments 1 thus formed are installed continuously in the tunnel circumferential direction alternately and with the concave portions 2 and the convex portions 3 engaged, and the joint fittings 4 and the insert fittings are installed in the longitudinal direction of the tunnel. It is installed for quick reading while engaging with 5.

Inwardly rolled concrete 9 is cast inside the segment ring assembled in this way.

Fig. 7 shows another embodiment of the joint metal fitting and the insert metal fitting, in which only the metal insert 5.5 is buried in the end face of the concrete segment 1, and the joint metal fitting 4 is inserted into both inserts when the concrete segment 1 is assembled. Metal fittings 5
．． The structure is such that it can be inserted into the 5.

With this configuration, since the joining metal fittings 4 do not protrude from the end face of the concrete segment 1, there is no fear that the joining fittings 4 will be damaged during handling such as transportation.

Further, since the concrete segment 1 is formed into a trapezoidal shape, the segment ring to be assembled will be divided into an even number, but if a key segment 10 is used as shown in FIG. 9, it can also be divided into an odd number.

〔Effect of the invention〕

Since the present invention has the above configuration, it has the following effects.

■ The inner lining of the tunnel can be constructed using only one type of segment, and no bolts are required to connect the segments, making assembly work extremely easy.

Moreover, since the segment rings are formed in a trapezoidal shape and are arranged alternately in the circumferential direction of the tunnel, the segment rings are significantly tightened. Furthermore, the segments that are connected in the longitudinal direction of the tunnel are integrally connected by a joining fitting and an insert fitting. Therefore, the tunnel lining can be constructed with stable strength.

Furthermore, since the shape is extremely simple, manufacturing is easy, and manufacturing costs can be reduced through mass production.

[Brief explanation of the drawing]

Figures 1 to 9 show an embodiment of this invention.
Figure 1 is a front view of the segment ring, Figure 2 is a plan view of the concrete segment, Figure 3 is its side view, Figure 4 is a partially cutaway view of the concrete segment, Figure 5,
6 and 7 are partial sectional views of a concrete segment showing a joining fitting and an insert fitting, FIG. 8 is a plan view of the joining fitting, and FIG. 9 is a front view of a segment ring. l... Concrete segment, 2... Concavity, 3...
・Convex part, 4... Joining fitting, 5... Insert fitting, 6... Grout hole, 7... Stopper 8...
・Locking part, 9... Inner wrapping concrete, 10... Key segment. Figure 1 Figure 2 Figure 4 Figure 3 Figure Figure Figure Figure n

Claims (1)

[Claims] (1) A concrete segment that is installed continuously in the circumferential and longitudinal directions of a tunnel, and is formed into a trapezoidal shape, with uneven parts that engage with each other at the circumferential ends of the tunnel. What is claimed is: 1. A concrete segment characterized in that the longitudinal end of the tunnel is provided with a joining fitting and an insert fitting that engage with each other.