Patent ID: 7353889

Claim:
A pipe-bursting apparatus for use with a dual-member drill string comprising an outer member and an inner member, wherein the inner member is rotatable independently of the outer member, the apparatus comprising: a frame connectable with the drill string; a drive assembly supported by the frame and operable in response to rotation of the inner member of the drill string; a rod rotatably supported within the frame and rotatable in response to operation of the drive assembly; and a first pipe-bursting member supported by the frame and operatively connected to the rod; wherein the first pipe-bursting member is operable in response to rotation of the rod; a first movable wedge adapted to expand the first pipe-bursting member, a second pipe-bursting member supported by the frame and disposed in an opposing orientation to the first pipe-bursting member; a second movable wedge adapted to expand the second pipe-bursting member; and wherein the first and second wedges are supported by the frame and operatively connected to the rod for movement towards or away from each other in response to rotation of the rod.