Bellows with joint unit

Abstract

The invention provides a corrugated pipe with a joint part. On the inner wall surface of the joint part (11) formed on one end side of the pipe wall (4), engaging pieces (22, 22) made of thin-walled metal plates are provided. ). By using the protrusion (2) of the bellows (1) on the mating side to push the hooking pieces (22, 22) outwards against their elastic force, the bellows (1) on the mating side is allowed to move toward the joint (11). Insert, and by making the hook piece (22, 22) use its elastic restoring force to be embedded in the gap between the adjacent convex parts (2, 2) of the butt side bellows (1) inserted in the joint part (11), Make it locked with the convex part (2), so as to prevent the corrugated tube (1) on the mating side from falling off from the joint part (11). Thereby, the joint part can be suppressed as much as possible to protrude outward than the convex part of the pipe wall, the corrugated pipe on the mating side can be reliably prevented from falling off, the connection operation can be simplified, and the formation of the multi-hole pipe will not be hindered.

Description

technical field [0001] The present invention relates to a configuration of a bellows having a joint portion for connecting the bellows. Background technique [0002] Conventionally, in addition to protection tubes for accommodating and protecting cables such as electric wires and optical cables, as water supply pipes and sewer pipes, synthetic resin corrugated pipes, which are made of corrugated pipe walls and have excellent pressure resistance and flatness, have been widely used. [0003] Among such corrugated tubes, particularly, by using a corrugated tube in which the convex portion is made to have a substantially square cross section, as disclosed in Patent Document 1, for example, stable piping with less twist can be realized. Furthermore, when a plurality of pipes are bundled in parallel to form a multi-hole pipe, the parallelism or straightness thereof can be maintained favorably. [0004] When piping such a corrugated pipe, for example, as disclosed in Patent Docume...

AI Technical Summary

Problems solved by technology

However, if the joint is simply provided with a locking member, the outer shape of the joint becomes larger and protrudes farther outward than the convex portion of the bellows, or a protruding portion occurs on the outer peripheral surface of the joint. It interferes in bundling the corrugated tubes, thereby necessarily hindering the formation of the porous pipe as described above.

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