INSTALLATION FOR TRENCHLESS REPLACEMENT OF PIPELINES Russian patent published in 2011 - IPC F16L1/28 F16L55/18 

FIELD: machine building.

SUBSTANCE: installation consists of working element connected with towing element by means of stretching wire and of device for redistribution of static force made in form of upper and lower spreaders, front and back rods and upper and lower levers. The levers are arranged on sides of the rods symmetrically relative to each other and swivelling in plane of their lengthwise section. With their one end the levers are connected with a rod, while with another end the upper lever is connected with internal surface of the upper spreader, while the lower lever is connected with internal surface of the lower spreader. The front rod is connected with the working element by means of an intermediate wire. A platform made integral with the rods is positioned between the spreaders. Springs symmetrically positioned on the platform on cylinder supports are installed between the upper spreader, the platform and the lower spreader. Removable straps of friction material are set on external surface of the spreaders by means of screws. A stop arresting motion of the levers is located on one of the rods. The back rod is connected with a disassembling wire. The upper and lower levers are arranged correspondingly parallel to each other.

EFFECT: reduced force for pulling new pipeline.

5 dwg