Rotating push rod boring system

Details Rotating push rod boring system Rotating push rod boring system

E - Fixed Constructions

21

B

E21B 4/00 (2006.01) E21B 7/00 (2006.01) E21B 7/04 (2006.01)

Patent

CA 2287050

A push rod rotator and push rod boring rig uses a reciprocating carriage to push a drill string of push rods into the ground and pull the drill string back out usually with an expander and pipe or utility lines. A push rod rotator is connected to a swivel supported on the non-rotating carriage. The rotator is a two-part assembly, one part is a non-rotating conduit, having two or more helical slots and the other part has a pin which follows the slots for inducing relative rotation. Slips grip the: push rods and are reversible to enable push and pull operations. Preferably the slips trail the carriage and the rotator leads the swivel. The rotator is adapted to a boring rig having a frame, and hydraulic cylinders for reciprocating the carriage relative to the rig. The double-acting cylinders are mounted in pairs with the powerful extension stroke oriented to pull back the drill string and push rods and the weaker retraction stroke to push rods.

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