JPS6141837Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a joint for concrete pipes, in particular a joint for concrete pipes for the propulsion method.

The illustrated example is an embodiment in which a collar 2 is attached to the end of one concrete pipe 1 using an anchor ring 3 and a sealing material 4 such as rubber is buried, and the other concrete pipe 5 is attached to the end of the concrete pipe 1. A recess 6 is provided at the end, a gasket 7 is interposed between the recess 6 and the collar 2', and steel boxes 8 are buried at a plurality of locations on the inner periphery of both tube ends, for example, at six locations at equal intervals, A bolt 10 is inserted between the opposing boxes 8, 8 through an elastic material such as a rubber ring 9 disposed in each box, and the end of the bolt 10 is inserted into the nut 1.
1 to connect both boxes 8,8. That is, since the rubber rings 9 are held in the opposing boxes 8 by the side walls of the boxes 8 and the heads of the bolts 10 or the nuts 11, pressure is always applied in the direction of coupling.
When stress acts on both concrete pipes 1 and 5 in the direction of separating them from each other, the elastic force of the rubber ring 9 acts in the opposite direction to the stress.
As a result, the two adjacent concrete pipes 1 and 5 are always tightly connected, and the water-stopping effect of the gasket 7 is not lost. In addition, even if bending stress is applied to the joint portion of both concrete pipes 1 and 5 due to ground subsidence, a portion of the bending stress is absorbed by the action of the rubber ring 9, and the rest is absorbed by the adjacent concrete pipes. The stress is transmitted and distributed to the joints of the concrete pipes, eliminating stress concentration in one place.

This joint is mainly applied to concrete pipes for the so-called propulsion method, in which each concrete pipe is laid by pushing the concrete pipe 1 with the concrete pipe 5 in the direction of the arrow in the figure. Of course, it can also be used as a joint for general concrete pipes.

In use, first, the concrete pipe 5 is inserted into the concrete pipe 1 with the gasket 7 interposed therebetween, and each concrete pipe is pushed and laid according to a conventional method. Before the start of propulsion or after the completion of propulsion, rubber rings 9, 9 are placed in the box 8 from inside the concrete pipes 1, 5, and the bolt 10 is inserted between both boxes by penetrating these rubber rings 9, 9. Then, tighten the rubber rings 9, 9 with nuts 11.

Thus, the two concrete pipes 1, 5 are connected via the rubber rings 9, 9. After the connection, it is desirable to fill the box with a suitable filler material.

Since the concrete pipe joint according to the present invention elastically connects both concrete pipes, it is possible to effectively prevent both concrete pipes from separating when buried and causing the joint to lose its water-stopping effect. .

[Brief explanation of the drawing]

The figure is a longitudinal sectional view showing an embodiment of a joint for concrete pipes according to the present invention. 1, 5...Concrete pipe, 2...Color, 3
... Anchor, 4 ... Seal material, 6 ... Recess, 7
...Gasket, 8...Box, 9...Rubber ring, 10,11...Bolt, nut.

Claims (1)

[Scope of utility model registration request] A collar is fixed to the end of one tube, a recess is provided on the outer periphery of the end of the other tube, a gasket is interposed between the collar and the recess, and boxes are buried at multiple locations on the inner periphery of both tube ends. A joint for concrete pipes, characterized in that a bolt is inserted between each box via the elastic material, and the ends of the bolt are tightened with a nut to connect the two boxes.