Pipe laying and replacement

E - Fixed Constructions – 03 – F

Patent

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61/5.1

E03F 3/06 (2006.01)

Patent

CA 1221551

ABSTRACT OF THE DISCLOSURE Title: IMPROVEMENTS IN PIPE LAYING AND REPLACEMENT Apparatus for use in the laying and/or replacement of pipes underground comprises a casing (1), a frusto- conical impact member (2) secured to one end of the casing and adapted to form an underground passage for the casing when the apparatus is being driven through the ground, a piston (7) reciprocally mounted in the casing and arranged to be driven by a source of compressed air or other fluid to engage the impact member (2) with a series of impacts to drive said member and the casing through the ground and a control valve member (11) adapted to be connected to a source of compressed air or other fluid and arranged to reciprocate the piston in the casing by means of said compressed air or other fluid. A pipe fitting (31) is connected to a tubular spacer member (23) which is mounted on the other end of the casing (1), said pipe fitting being adapted to be clamped to the leading end of a pipeline (29 and/or 30) which is to be laid in the underground passage formed by the impact member (2). The connection between the pipe fitting (31) and spacer member (23) includes a flanged sleeve (25) which permits relative rotation between the pipe fitting and the casing.

469091

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