Replacement of mains

Details Replacement of mains Replacement of mains

1983-01-21

1985-03-19

Bryant, III, James E.

Pipes and tubular conduits

Repairing

30 92, 30 925, 166 552, 225103, 405156, 405184, F16L 5518

Patent

active

045053022

ABSTRACT:
A mole 1 for replacing an existing main, for example a cast iron gas main, with a new main. The mole 15 is of steel and is inserted into and along the existing main 94. The mole 51 has a front portion comprising a head 52 and a cylindrical body portion and a rear portion 53 having a clamp 54 for clamping a new main to the mole 51. The head 52 has a cutting face 55 for engaging the internal wall of the existing mole 51 therealong. The new main which in use is clamped to the mole 51 is towed along behind the mole 51 to replace the fractured old main 94.

REFERENCES:
patent: 1638494 (1927-08-01), Lewis et al.
patent: 1717588 (1929-06-01), Small
patent: 3005493 (1961-10-01), Crowe et al.
patent: 3073389 (1963-01-01), Conner
patent: 3181302 (1965-05-01), Lindsay
patent: 3543377 (1970-12-01), Bremner

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