JPH0280793A - Joint metal for concrete segment - Google Patents

Abstract

PURPOSE:To improve strength against the tensile force of bolt by a method in which a narrow and long joint end plate having a bolt-through hole in the widthwise central part is provided, and a narrow and long arched plate part curved backwards across between the bases of anchor-fitting parts is integrally provided. CONSTITUTION:A joint end plate 2 is of a narrow and long form to make up the front face of a joint metal 1, having a bolt-through hole 3 in its widthwise central part. Anchor-fitting parts 5 are integrally formed on left- and right ends of the plate 2, and the part 5 is of a backwardly projected cylinder form, having an anchor-fitting threaded hole 6 opening in the back end. An arched plate 7 is integrally provided across the bases of the parts 5 in a backwardly curved small and long form. Anchor reinforcing bars 10 are thrust through the holes 6.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to the construction of pipes such as water supply and sewerage, subway, and telecommunication cable accommodation tunnels, underground passages, water intake tunnels, water discharge tunnels, and public ditches using the shield construction method. This relates to joint fittings for concrete segments used in

[Traditional technique]

Conventionally, joint fittings for concrete segments have a U-shaped steel joint plate part, a bolt insertion hole is provided in the center of this joint plate part, and an L-shaped metal fitting is installed from the rear end of the flange of the joint plate to the bottom. The arrangement is generally known.

[Problems to be solved by this invention]

By the way, in the case of conventional joint fittings for concrete segments, the joint itself is heavy, and the parts that make up the joint are welded together, so it takes time and effort to manufacture, and the strength against bolt tensile force is weak. was there.

An object of the present invention is to provide a concrete segment joint fitting that is lightweight, requires no effort to manufacture, and has strong strength against bolt tensile force.

[Means to solve the problem]

In order to achieve the above-mentioned object, this invention forms a joint end plate in the shape of an elongated rectangle with a bolt insertion hole bored in the center in the width direction, and around the bolt insertion hole there is a ring-shaped joint end plate that protrudes toward the back side. A hole reinforcement part is provided, and a cylindrical anchor reinforcing bar attachment part protruding toward the back is integrally formed at both ends of the joint end plate, and an anchor reinforcing bar attachment part is formed on the back end face of this anchor reinforcing bar attachment part. A slender arch plate-like part is provided integrally with a slender arch plate-like part that extends between the bases of the anchor reinforcing bar attachment parts and curves in the back direction, and the central part in the width direction of this arch plate-like part is provided with a hole. The bolt insertion hole is provided with a bolt insertion hole that communicates with the bolt insertion hole of the joint end plate, and a ring-shaped hole reinforcement portion that protrudes toward the rear surface is provided around the bolt insertion hole.

〔Example〕 The following description will be made based on the illustrated embodiment.

Reference numeral 1 shows a joint fitting according to the present invention, and this joint fitting 1 is made of cast steel and each part is integrally formed. Reference numeral 2 indicates a joint end plate portion of the joint metal fitting 1. The joint end plate 2 constitutes the front part of the joint metal fitting 1, and is formed into an elongated rectangular plate shape, with a bolt insertion hole 3 bored in the center in the width direction. A ring-shaped hole reinforcing portion 4 is provided around the bolt insertion hole 3 and protrudes toward the rear surface. And above the bolt insertion hole 3 portion in the joint end plate 2.

The lower edge is slightly curved.

Anchor reinforcing bar attachment portions 5 are integrally provided at the left and right ends of the joint end plate 2. The anchor reinforcing bar attachment portion 5 is formed into a single cylindrical shape that protrudes toward the back, and has a threaded anchor reinforcing bar attachment hole 6 that opens at the end face of the back.

An arch plate-shaped part 7 is further integrally provided spanning between the bases of the left and right anchor reinforcing bar attachment parts 5, 5. This arch plate-shaped portion 7 is curved in the back direction and formed into an elongated shape, and is provided oppositely on the back surface of the joint end plate 2, and has a bolt insertion hole in the joint end plate 2 at the center in the width direction. A bolt insertion hole 8 communicating with 3 is bored, and a ring-shaped hole reinforcing portion 9 is provided around the bolt insertion hole 8 to protrude toward the back side.

An anchor reinforcing bar 10 is fitted into the anchor reinforcing bar attachment hole 6.

FIG. 3 shows a second embodiment. In this embodiment, a system 11 is fixed that spans between the bolt insertion hole 3 portion of the joint end plate 2 and the bolt insertion hole 8 of the arch plate-shaped portion 7 in the first embodiment and communicates with each other. Further, a space 12 between the joint end plate 2 and the arc plate-shaped portion 7 is filled with concrete 13.

〔Effect of the invention〕

As described above, in this invention, since the joint end plate and the arch plate-like part are formed in an elongated shape, the overall height is low and thin, and therefore it is lightweight, and each part is integrally formed. Therefore, it has strong strength against bolt tensile force and requires no effort to manufacture.

Furthermore, the presence of concrete in the space between the joint end plate and the arch plate allows stress to be distributed even if the arch plate is made thinner. Therefore, the joint end plate portion can be reinforced with the material left over from the arch plate-shaped portion, and the strength is further improved.

Also, since this part does not become hollow, the environment in which the iron material is placed is good and rust is less likely to occur.

[Brief explanation of the drawing]

FIG. 1 is a rear view, FIG. 2 is a cross-sectional view, and FIG. 3 is a plan view of the second embodiment. 1...Joint fittings, 2...Joint end plates, 3
...Bolt insertion hole, 4...Hole reinforcement part,
5... Anchor reinforcing bar attachment part, 6... Anchor reinforcing bar attachment hole, 7...
Arch plate-shaped portion, 8... Bolt insertion hole, 9...
... Hole reinforcement part, 10 ... Anchor reinforcing bar, 11
... Sheath, 12 ... Space part, 13.
·····concrete.

Claims (1)

[Claims] An elongated rectangular joint end plate is formed with a bolt insertion hole in the center of the width direction, and a ring-shaped hole reinforcement part that protrudes toward the back is provided around the bolt insertion hole. A cylindrical anchor reinforcing bar attachment part that protrudes toward the back is integrally formed at both ends of the anchor reinforcing bar, and an anchor reinforcing bar attachment hole is bored in the back end surface of the anchor reinforcing bar attachment part. An elongated arch plate-like part straddling between the bases of the reinforcing bar attachment part and curving in the back direction is integrally provided opposite to the back face of the joint end plate, and a central part in the width direction of this arch plate-like part is provided. A concrete segment joint fitting comprising a bolt insertion hole communicating with the bolt insertion hole of the joint end plate, and a ring-shaped hole reinforcing portion protruding toward the rear surface around the bolt insertion hole.