JPH023030Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a joint structure for a propulsion pipe in a concrete pipe.

Currently, when concrete pipes are being pushed underground, rubber rings having a structure as shown in Figures 1 and 2 are used to stop water at the joints. That is,
A groove b or a step c is provided around the end of the concrete pipe a, or a step c is provided on one side in the direction of propulsion, and an annular rubber ring d having a semicylindrical or other shape in cross section is fitted into this, and a special force is applied to the end of the concrete pipe a. When this occurs, the lower surface of the rubber ring d is adhered to the concrete pipe a, and the protrusion of the rubber ring d is brought into contact with the inner wall of the steel collar e to stop water.

However, in such a method, the rubber ring d is not completely fixed, and when the pipes are joined together, the rubber ring d is turned over, causing water leakage. In addition, in the case of an intermediately pushed pipe, the steel collar and concrete pipe slide back and forth hundreds of times by the intermediate jack, so a tensile force is applied to the rubber ring back and forth each time, causing grooves or Accidents of falling off the stepped section often occur. If the rubber ring comes off in this way, it not only causes water leakage as mentioned above, but also causes meandering of the pipe and an increase in propulsion force, which has a serious impact on the success or failure of the construction work. It was hot.

The present invention has been made in view of the above-mentioned circumstances and aims to provide a propulsion pipe joint that solves the above-mentioned problems.

That is, the present invention provides an elastic ring consisting of a pair of annular protrusions that abut against the inner wall of the opposing collar and a flat annular groove between the protrusions, and connects the elastic ring to a concrete pipe. A concrete pipe characterized in that a flat band-shaped rigid ring is fitted into the annular groove of the concrete pipe, and a bolt is inserted from above the rigid ring and tightened and fixed to an embedded nut provided in the concrete pipe. It has a joint structure.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In Fig. 3, 1 is a rubber ring made of an elastic material such as rubber, 2 is a ring made of steel, for example, that holds down the rubber ring 1, 3 is a bolt for tightening, and 4 is installed around the concrete pipe at a suitable location. a plurality of embedded nuts 5, a concrete pipe into which the rubber ring 1 is fitted;
6 each indicates a steel collar.

The rubber ring 1 is formed into a belt-like annular shape, and has a groove 8 around the outer periphery of the middle part and protrusions 9 on both sides of the groove. A suitable number of holes for inserting bolts are formed through the groove 8 on its circumference.

A groove 10 of an appropriate depth is provided around the concrete pipe 5, into which the bottom 7 of the rubber ring 1 is fitted.

The entire circumference of the ring 2 is divided into one to several pieces,
A suitable number of holes are provided around the circumference through which the bolts 3 are inserted.

When assembling, embed the embedding nut 4 in the appropriate position of the concrete pipe 5 in advance, attach the rubber ring 1 to the groove 10 of the concrete pipe 5, and insert the ring 2 into the groove 8 of the rubber ring 1. Fit into place. Next, the position of the embedded nut 4 embedded in the concrete pipe 5,
The bolt insertion holes of the rubber ring 1 and the bolt insertion holes of the ring 2 may be aligned, and the bolts 3 may be screwed in and tightened.

In addition, at this time, an adhesive may be applied to the bottom part 7 of the rubber ring 1 to fix it.

Next, in the embodiment shown in FIG. 3, a structure in which the groove 10 is not provided in the concrete pipe 5 and the rubber ring 1 is directly fixed to the outer peripheral surface of the concrete pipe 5 can be used as a second embodiment. .

The one shown in FIG. 4 is a third embodiment of the present invention, in which flange portions 15 are stretched on both sides of the rubber ring of the embodiment shown in FIG. They are each bolted and fixed to a separately provided embedded nut 14 in a concrete pipe.

FIG. 5 shows a fourth embodiment of the present invention, in which a concrete pipe 25 has a steel plate 30 surrounding it, and a pair of stopper rings 3 on both sides of the place where a rubber ring is attached.
1 is fixed by means such as welding. In this case, the embedded nut 34 is fixed to the steel plate 30 by means such as welding. The other configuration is shown in Figure 3.
This is similar to the embodiment.

As described above, according to the joint structure according to the present invention, the rubber ring is strongly fixed to the concrete pipe,
Therefore, unlike the conventional structure, the rubber ring may turn over,
It does not come off, and therefore it is possible to prevent accidents that often occur in the past, such as water leakage, meandering of pipes, and increased propulsion force.

In other words, even if the concrete pipe slides back and forth hundreds of times due to intermediate jacks during construction,
The protrusions on the rubber ring complement each other by corresponding to one protrusion when sliding in one direction, and the other protruding when sliding in the opposite direction, to prevent the rubber ring from coming off or leaking water. It is set as. That is, it can withstand action from either direction, and is provided with double support by the two protrusions.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of a conventional propulsion pipe joint structure, FIG. 3 is a cross-sectional explanatory diagram of a first embodiment of the propulsion pipe joint structure according to the present invention, and FIGS. 4 and 5 are FIG. 7 is an explanatory cross-sectional view showing the third and fourth embodiments of the present invention, respectively. 1,23...Rubber ring, 2,22...Ring,
5, 25... Concrete pipe, 31... Stopper ring.

Claims (1)

[Scope of utility model registration request] An elastic ring is provided, which is made up of a pair of annular protrusions that come into contact with the inner wall of the opposing collar, and a flat annular groove between the protrusions, and the elastic ring is fitted into a concrete pipe. A joint structure for a concrete pipe, characterized in that a flat band-shaped rigid ring is fitted into the annular groove, and a bolt is inserted from above the rigid ring and tightened and fixed to an embedded nut provided in the concrete pipe.