JPS5953437B2 - concrete structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to concrete structures used in constructing subway tunnels, water and sewerage systems, and water storage tanks.

Recently, when constructing subway tunnels, water supply and sewerage systems, and water storage tanks,
For the purpose of shortening the construction period and reducing the space at the construction site, concrete structures in the form of circular arc plates are used, which are standardized and produced in advance at factories.

This concrete structure is transported from a factory to a construction site, where it is prefabricated and assembled to construct subway tunnels, water supply and sewage systems, etc.

Incidentally, conventionally, this type of concrete structure was constructed as shown in FIG.

That is, a plurality of joint fittings 2 are buried in the end face of the arc plate-shaped concrete structure 1, and the connection between adjacent concrete structures is made by aligning the end faces of the concrete structures 1 and providing them on the end faces. This is done by tightening the joint fittings 2 together with bolts.

As shown in FIGS. 2 and 3, this joint fitting 2 is constructed by fixing embedded legs 6 by welding to both sides 5 of a flange portion 4 having bolt insertion holes 3. 6 is embedded in the concrete structure 1, and the flange portion 4 is exposed at the end face of the concrete structure 1.

However, according to conventional concrete structures, the flange part of the joint fitting is made of a thin steel plate, so when a strong tensile force acts in a direction that pulls the joint end surfaces of both concrete structures apart from each other, the central part of the joined flange part When stress concentrates on the bolted part 7 of the concrete structure, the flange part 4 curves and the bolted central part bulges outward as shown in Fig. 4, causing the joint end surfaces of both concrete structures to pull against each other. There was a risk of leaving.

This is extremely important for water supply, sewage, and water storage tanks where water retention is an absolute requirement, and is also extremely important in that it weakens the structure of the water supply, sewage, and water storage tanks themselves.

Therefore, various proposals have been made to reinforce the flange portion of the joint fitting, but none of them have been able to sufficiently eliminate the above-mentioned drawbacks.

Furthermore, according to conventional concrete structures, both sides of the joint fittings and the embedded legs are simply buried in the concrete structure, so a strong tensile force acts in the direction of separating the joint end surfaces of both concrete structures from each other. In such a case, there was a risk that the joint fittings would come off from the concrete structure.

The present invention has been made in view of the above circumstances, and its purpose is to prevent the joined end surfaces of the concrete structures from being separated from each other even if a tensile force is applied between the two connected concrete structures, and to prevent the concrete structures from being separated from each other. To provide a concrete structure in which a joint fitting buried in the structure is prevented from coming off from the concrete structure.

FIG. 5 shows an embodiment of the present invention, in which a concrete structure 8 is constructed in the shape of a circular arc plate, and a plurality of joint fittings 9 are buried in the end face thereof at appropriate intervals.

As shown in FIG. 6, this joint fitting 9 has three rectangular support parts 12 extending radially at equal intervals in the circumferential direction on the outer periphery of a cylindrical bolt attachment part 11 having a bolt insertion hole 10. It is located in

A reinforcing bar connecting part 14 having a cylindrical shape and shorter than the bolt attachment part 11 having a reinforcing bar insertion hole 13 is provided at the end of the supporting part 12 .

The joint fitting 9 has a rib 1 connected to the outer peripheral surface thereof from the bolt attachment part 11 to the support part 12 and the reinforcing bar connection part 14.
5 is provided and integrally formed by casting.

On the other hand, as shown in FIG. 7, a part of the reinforcing bars 16 constituting the frame of the concrete structure 8 has a male threaded portion 16a formed on the outer circumferential surface of the end thereof.

The reinforcing bar connecting part 14 is inserted into the reinforcing bar 16 formed with the male screw part 16a, and the end of the reinforcing bar 16 is inserted into the reinforcing bar insertion hole 13, and the reinforcing bar 16 protrudes from the reinforcing bar insertion hole 13.
A locking nut 17 is screwed onto the male threaded portion 16a of the connector.

As described above, the joint fitting 9 connects its reinforcing bar connecting part 14 to the reinforcing bar 16, and as shown in FIGS. It is buried so as to coincide with the end face of the concrete structure 8.

In addition, 18 in the figure is the joint fitting 9 of the concrete structure 8.
The inner end surface of the bolt attachment part 11 is exposed on the inner wall surface 18a of the opening for bolt fastening operation provided near the buried position.

Therefore, the concrete structure configured as described above, e
In order to connect the 18 pieces, the end faces 19 and 19 of the concrete structures 8 and 8 are brought into contact with each other so that the positions of the bolt attachment parts 11 and 11 are aligned as shown in FIG.
The tightening bolt 20 is inserted into the insertion hole 10 of one bolt mounting part 11.
Then, it is inserted into the bolt insertion hole 10 of the other bolt attachment part 11, and the nut 22 is screwed and tightened via the fastening washer 21.

After the bolt fastening operation, the opening 18 is filled with a filler such as non-shrinkage mortar.

FIG. 9 shows another embodiment of the present invention, and the only difference from the above embodiment shown in FIG. Since the other parts are the same, they will be given the same reference numerals and their explanation will be omitted.

That is, a crushing prevention part 23 is formed at the end of the reinforcing bar 16.

Further, an inclined receiving part 24 for receiving the retaining part 23 is provided at one end opening of the reinforcing bar insertion hole 13 into which the reinforcing bar 16 is inserted.

Therefore, in order to connect the reinforcing bar connecting portion 14 to the reinforcing bar 16,
The reinforcing bar 16 is inserted into the reinforcing bar insertion hole 13, and the retaining part 23 is aligned with the receiving part 24.

Incidentally, since the concrete structures 8 are connected together in the same manner as in the above embodiment, the explanation thereof will be omitted.

In the above embodiment, as shown in FIG. 6, the joint fitting 9 was constructed by arranging three supporting parts 12 around the outer periphery of the bolt mounting part 11, but as shown in FIG. Two supporting parts 12 may be arranged around the outer periphery of the part 11, and the number of supporting parts 12 is not limited to three as in the above embodiment.

Although the joint fitting 9 is integrally formed by casting, for example, the bolt attachment part 11 may be made of a steel pipe or the like, and the support part 12 made of a steel plate may be welded to the outer periphery of the bolt attachment part 11.

In addition, if the ribs 15 are continuously provided on the outer circumferential surface of the joint metal fitting 9 as shown in the above embodiment, the thickness of the joint metal fitting 9 can be reduced and the weight can be reduced.

In addition, this rib 15 has a joint fitting 9 that is connected to a concrete structure 8.
It has the effect of preventing it from slipping out.

FIG. 10 shows another embodiment of the present invention, in which a rib 15a is provided on the front surface of the support portion 12 of the joint fitting 9, which slopes upward from the reinforcing bar connection portion 14 toward the bolt attachment portion 11.

As explained above, according to the concrete structure of the present invention, since the bolt attachment part of the joint fitting buried in the concrete structure is configured in a cylindrical shape, a tensile force is exerted between the two connected concrete structures. Even if the bolt is applied, the bolt attachment part does not bulge outward like the flange part of a joint fitting buried in a conventional concrete structure. They will never be separated from each other.

Further, a support part extending radially around the outer periphery of the bolt attachment part is provided, and a reinforcing bar connection part having a reinforcing bar insertion hole is provided at the end of the support part, so that this reinforcing bar connection part can be connected to the concrete IJ -
1-Since the reinforcing bars that make up the frame of the structure are inserted into the reinforcing bar insertion holes and connected by providing a stopper at the end of the reinforcing bars, there is no risk that the joint fittings will slip out of the concrete structure. At the same time, the strength of the concrete structure is improved, and the reinforcing bars and the reinforcing bar joints of the joints are reliably connected.

Further, since the reinforcing bar connecting part is provided at the end of the support part extending radially from the outer periphery of the bolt attachment part, there is an advantage that the reinforcing bar connecting part can be easily connected to the reinforcing bar.

[Brief explanation of the drawing]

Figures 1 to 4 show conventional examples. Figure 1 is a perspective view of a concrete structure, Figure 2 is a perspective view of a joint fitting, and Figure 3 is a buried joint fitting of a concrete structure. 4 is a sectional view showing a state in which the joint surfaces of the concrete structure are separated by tensile force, and FIGS. 5 to 10 show an embodiment of the present invention. Figure 5 is a perspective view of the concrete structure, Figures 6 and 10 are perspective views of the joint fittings, Figure 7 is a partial vertical cross-sectional view showing the state in which the concrete structures are connected, and Figure 8 is the perspective view of the concrete structure. A side view, FIG. 9 is a partial sectional view showing another embodiment of the concrete structure in a connected state, and FIG. 11 is a partial cross-sectional view showing another embodiment of the present invention. 8...Concrete structure, 9...Joint fittings, 110...Bolt insertion hole, 11...
...Bolt mounting part, 12... Support part, 13.
...Reinforcing bar insertion hole, 14...Reinforcing bar connection part,
16... Reinforcing bar, 17... Retaining nut, 23... Retaining part.

Claims (1)

[Claims] 1. A radially extending support part is provided on the outer periphery of a cylindrical bolt attachment part having a bolt insertion hole, and a cylindrical reinforcing bar connection part having a reinforcing bar insertion hole is provided at the end of this support part to constitute a joint fitting. , the reinforcing bar connecting part is connected to the reinforcing bar constituting the frame of the concrete structure by inserting the reinforcing bar into the reinforcing bar insertion hole and providing a stopper at the end of the reinforcing bar, and connecting the reinforcing bar to the reinforcing bar constituting the frame of the concrete structure by providing a stopper part at the end of the reinforcing bar, A concrete structure characterized in that the above-mentioned joint fitting is buried in concrete so that it opens at an end face of the concrete structure.