JOINT FOR ACTIVE PIPE BRANCH

摘要

PROBLEM TO BE SOLVED: To prevent a chip tray from being displaced from a given position at the inner bottom part of a second division joint also when branching take-out is effected by obliquely assembling a joint for active pipe branch since a distance between an original pipe and other buried pipe is narrow, and to suitably realize take-out of chips even in case of branch take-out at oblique piping, in a joint for active pipe branch wherein chips are stored in a chip tray after boring of the original pipe by a hole saw, and then taken out.

SOLUTION: A pair of first and second division joints 4 ad 5 are conjugated with a part in an axial direction of the original pipe 1 and a branch pipe 2 is connected to a branch pipe connection port 13 of the second division joint 5. A hole saw 26 is set at a boring control port 14 of the second division joint 5. Chips 42 generated by boring are stored in a chip tray 15 situated in a recessed part 46 of the inner bottom of the second division joint 5. The chip tray 15 is held in a fit-in state in the recessed part 46 with a shrinkable and deformable elastic ring 47 situated in a size-reduced state on the inner periphery of the upper end part of the opening of the recessed part 46, and lifting of the chip tray 15 from the recessed part 46 in a diameter expandable state is allowed.

COPYRIGHT: (C)2004,JPO