Pneumatic rodding of conduit using everted flexible tubing

Details Pneumatic rodding of conduit using everted flexible tubing Pneumatic rodding of conduit using everted flexible tubing

1978-10-02

1980-05-13

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Method or apparatus for placement of conductive wire

By fluid pressure differential in conduit

A61M 2500

Patent

active

042025311

ABSTRACT:
Utility lines or cables are installed in underground conduit using imperforate flexible tubing having a circumference no less than that of the conduit interior. One end of the tubing is everted and fixed within the conduit near end. Air blown into said near end is directed against a displaceable pocket between the fixed everted end and entering portion of the tubing so that the tubing lines the conduit interior wall, taking its shape and strength therefrom, as it is advanced through the conduit to the far end thereof. In one embodiment, the tubing when half way through is severed outside the conduit near end and a pull line attached thereto is drawn with the tubing the rest of the way through the conduit to its far end; and the tubing is twisted on the pull line to form a tow of higher tensile strength. In a modification, the twisting step is omitted and the pull line is attached to the inner portion of the tubing at the far end of the conduit; and it is drawn with the inner portion of the tubing back through the everted portion while continuing to blow air of reduced pressure into the near end of the conduit to prevent tubing collapse.

REFERENCES:
patent: 3119599 (1964-01-01), Tuttle
patent: 4077610 (1978-03-01), Masuda

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