PROCESS OF TRENCHLESS LAYING (REPLACEMENT) OF PIPE-LINE, GEAR FOR ITS REALIZATION AND FIXTURE TO ANCHOR IT IN FOUNDATION AREA Russian patent published in 1999 - IPC

FIELD: laying or replacement of pipe-lines laid in the past in ground. SUBSTANCE: working and auxiliary foundation areas are formed, hole is drilled between them and new pipe-line is drawn. Working heads (penetration, breaking, drawing or combined) are attached to end of rod that is screwed together from identical sections increasing (decreasing) its length and is imparted with motion in forward (backward) direction with the aid of gear which includes power unit manufactured in the form of hydraulic cylinder with hollow plunger with passage of rod inside it. Each section of rod has local thickening against which ring butt cams of fixing unit rest. They are fixed on output end of plunger in end of cylinder opposite to it. Cams are coupled kinematically and spring-loaded to grip rod. Fixture to anchor gear in foundation area has bottom, front and rear plates close to walls. Pipes of rectangular section into which rods made from lengths of channel and attached to plates close to walls enter are fixed along bottom plate on both sides of cylinder. Hydraulic cylinder is mounted on U-shaped "bridge" where screws to adjust position of axis of cylinder over height and in lateral direction are located. Extremities of cylinder carry flanges that contact plates via rests adjusted by length to ensure rigid fixation of gear in foundation area. EFFECT: design of simple and reliable gear easy to handle. 11 cl, 8 dwg