JPH0523678Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a joint structure of concrete segments used in tunnels and the like.

[Prior art]

It has been common practice in the past to attach joint fittings to the peripheral surfaces of concrete segments in order to connect them to each other, and various ideas have been made. Many of these joint fittings have a structure in which, for example, flange plates are provided with bolt holes and the flange plates are fastened together with bolts.

[Problems to be solved by this idea]

By the way, these conventional joint fittings installed on concrete segments have a complicated structure and require a lot of manufacturing time such as welding and material costs, making the overall production cost of the concrete segment expensive. It was a lot.

This invention was devised in view of the above circumstances, and is intended to provide a concrete segment joint structure that has a relatively simple structure and is easy to construct.

[Means for solving problems]

The gist of this idea is to thread the inside of the concrete segment so that it opens on one side of the joint surface, make a notch on the circumferential surface of the rear end, and bury an insert socket that serves as an anchor, and then bury the insert socket on the opposite joint surface. A bolt hole made by burying a synthetic resin pipe is opened to correspond to the insert socket, and a large washer whose periphery is buried in concrete except for the inner surface of the segment is attached to one end of the synthetic resin pipe. The present invention is characterized in that a bolt box is provided adjacent to the washer, and a bolt inserted from the bolt box passes through the large washer and the bolt hole and is screwed into the insert socket.

〔Example〕

The following description will be made based on the illustrated embodiment. Reference numeral 1 designates a concrete segment, which is curved and has an insert socket 2 buried in its circumferential joint surface 1a. This insert socket 2 was formed into a cylindrical shape, and a notch was made on the circumferential surface of the rear end to open it outward if necessary.The insert socket 2 was threaded from the front end to the middle part (the threaded part was entirely It is approximately one quarter of the length). The insert socket 2 has its front end open to the circumferential joint surface 1a, and is buried closer to the inner surface (approximately two-thirds of the thickness from the outer circumferential surface).
equivalent position).

On the other hand, a bolt hole 3 is opened in the circumferential joint surface 1b opposite to the circumferential joint surface 1a at a position corresponding to the insert socket 2.
A synthetic resin pipe 4 is fixed to the rear end thereof, and a large washer 5 is attached to the rear end thereof in parallel to the thickness direction from the inner peripheral surface, and communicates with the bolt hole 3 through a hole 5a formed in the large washer 5. . Further, a rectangular bolt box 6 is provided on the back of the large washer 5 so as to open to the inner peripheral surface, and the large washer 5 has a segment 1.
The periphery, except for the inner surface, is buried in concrete.

In use, the circumferential joint surfaces 1a and 1b of the concrete segments 1 and 1 to be connected are brought into contact with each other to connect the insert socket 2 and the bolt hole 3, and the bolt 7 is inserted into the bolt box 6 via a washer 8 as necessary. It is inserted into the hole 5a of the metal 5 and the bolt hole 3, and further screwed into the insert socket 2, and is tightly connected to connect the segments 1, 1 to form a ring shape.

In the above embodiment, the joint fittings are attached only to the circumferential joint surfaces 1a and 1b, but as in the second embodiment shown in FIG. 6, the longitudinal joint surfaces 1c,
Similar fittings are attached to 1d,
For example, an insert socket 2 is embedded in the joint surface 1c, and bolt holes 3, bolt boxes 6, etc. are provided in the opposite joint surface 1d.

[Effect of idea]

As described above, this idea involves burying an insert socket with a notch at the rear end on one side of the joint surface to increase the fixing force, and burying the bolt hole and large washer in the concrete with most of the surrounding area on the other side. Since the box is provided with a large tightening strength and has an extremely simple structure, the manufacturing cost is low and there is no risk of damage. Furthermore, during construction, concrete segments can be firmly connected with each other by simply tightening bolts to insert sockets, making it easy to construct.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the front and back parts of the first embodiment, Figure 2 is a perspective view of the insert socket, Figure 3 is a perspective view of the large washer, and Figure 4 shows the state of connection between concrete segments. FIG. 5 is a longitudinal sectional view thereof, and FIG. 6 is a perspective view of a front surface portion and a back surface portion of the second embodiment. 1... Concrete segment, 2... Insert socket, 3... Bolt hole, 4... Synthetic resin pipe, 5... Large washer, 6... Bolt box, 7... Bolt, 8... Washer.

Claims (1)

[Scope of utility model registration request] A thread is cut inside to open on one joint surface, and an insert socket is made by making a notch on the circumferential surface of the rear end to serve as an anchor part, and an insert socket is installed on the opposite joint surface to correspond to the insert socket. A bolt hole formed by embedding a synthetic resin pipe is opened, a large washer whose periphery is buried in concrete except for the inner surface of the segment is attached to one end of the synthetic resin pipe, and a bolt box is installed adjacent to this washer. A concrete segment joint structure characterized in that a bolt is inserted from a bolt box, passes through a large washer and a bolt hole, and is screwed into the insert socket.