JPH0517356B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a joint structure of concrete segments for tunnel lining.

[Problem that the invention seeks to solve]

Mutual joining of concrete segments is generally performed by placing a joining steel plate in a bolt box provided at the joint end face position and joining both steel plates with bolts.

However, with this joining method, if a large tension is applied between the segments, the steel plates are compressed together, so there is a risk that the steel plates will be deformed due to bending.In addition, in bolt boxes without joining steel plates, the concrete will be damaged due to cross-sectional defects in the concrete. There is a risk of damage, the steel plate or concrete through which the bolts pass must be considerably thicker, and the strength of the joint may be compromised.

This invention was made for the purpose of solving these strength problems in segment joints and enabling strong joints with a simple structure.The purpose of this invention is to separate the bolt box from the joint end face, and remove the bolt head or nut from the contact area. This is an attempt to solve this problem by placing an L-shaped reinforcing steel plate in the area perpendicular to the abutting surfaces of the concrete and concrete.

[Means for solving problems]

In this invention, the bolt boxes that connect the segments with each other with bolts are arranged at a distance inward from the joint end faces, and the bending stress acting on the joint is resisted by the L-shaped reinforcing steel plate and the thickness of the concrete, thereby increasing the strength. Prevents deterioration and enables strong bonding.

Bolt insertion holes are bored between the joint end face and the bolt box end face, and a reinforcing steel plate provided with bolt holes is joined to the entire end face of the bolt box to reinforce this. In addition, the inner peripheral surface on the end face side of the bolt box is also protected by a reinforcing steel plate.

One, two, or three bolt insertion holes are provided, and the bolt holes are drilled in the reinforcing steel plate accordingly.

Basically, concrete resists the compression that acts between the reinforcing steel plates that are joined by bolts, but to further increase the strength, steel pipes for inserting bolts are joined to the reinforcing steel plates.

〔Example〕

The present invention will be explained below based on drawings showing embodiments.

First, the first invention will be explained with reference to FIG.

In this invention, a bolt box 2 is provided on the inner peripheral surface side at a distance inward from the joint end surfaces 1 that are joined by contacting each other, and the bolt box 2 is connected to the joint end surface 1a and the bolt box 2.
A bolt insertion hole 1b is bored between the end faces 2a of the bolt box, and an L-shaped reinforcing steel plate 3 provided with bolt holes 3a is joined to the entire surface of the bolt box end face 2a and the inner peripheral surface of the bolt box end face side of the segment 1. It is.

Next, the second invention will be explained with reference to FIG.

This invention has a structure in which a steel pipe 5 for inserting a bolt is joined to the end face 2a side of the L-shaped reinforcing steel plate 3 of the first invention to reinforce the bolt passage hole 1b.

The number of pipes 5 is 1 depending on the number of bolt insertion holes 1b.
The reinforcing steel plate 3 is joined to the end surface 2a of the bolt box 2 by inserting the pipe 5 into the bolt insertion hole 1b.

〔Effect of the invention〕

This invention is as described above, and has a structure in which the bolt box is provided apart from the joint end face, and the stress acting on the joint is borne by the L-shaped reinforcing steel plate, the thickness of the concrete, and even the steel pipe. It is possible to increase the strength of the part, and it is possible to perform a strong bolt connection.

In particular, a reinforcing steel plate that becomes a large washer will be placed on the entire joint end surface of the bolt box at the part where the bolt head or nut contacts, and this will also be integrated with the bolt insertion part on the inner peripheral surface of the bolt box end surface of the segment. In addition, since the steel plates are butted together with the concrete at the joint end faces, the joint strength can be further increased.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the first invention, and Fig. 2 shows an embodiment of the second invention.
is a sectional view, and is a perspective view showing a reinforcing steel plate. 1... Concrete segment, 1a, 1a'...
...Joining end surface, 1b...Bolt insertion hole, 2...Bolt box, 2a...End face, 3...L-shaped reinforced steel plate, 3a...Bolt hole, 5, 5'...Pipe.

Claims (1)

[Scope of Claims] 1. A bolt box is provided on the inner peripheral surface side with a distance provided inwardly between the joint end surfaces to be joined to each other, and a bolt insertion hole is bored between the bolt box end surface and the joint end surface. A concrete segment characterized in that an L-shaped reinforcing steel plate provided with bolt holes is joined to the entire surface of the end face of the bolt box and to the inner circumferential face on the end face side of the bolt box. 2. A bolt box is provided on the inner circumferential surface side with a distance inward between the joint end surfaces to be joined, and a bolt insertion hole is drilled between the bolt box end surface and the joint end surface, and a steel plate for bolt insertion is provided. A concrete segment characterized in that an L-shaped reinforcing steel plate to which a manufactured pipe is joined is inserted into a bolt insertion hole and joined to the entire surface of the end face of the bolt box and the inner circumferential face on the end face side of the bolt box.