PIPELINE UNDERMINING MACHINE Russian patent published in 2003 - IPC

FIELD: oil mains. SUBSTANCE: invention relates to machinery designed for major repairs of oil mains, particularly to machines for working out and removing soil from under pipeline to be repaired. Proposed undermining machine contains body, two working members, travel motion drive, hydraulic system and electrical equipment. Travel motion drive is made in form of leverage with hydraulic cylinder and two carriages with rotation drive. Carriages are brought to surface of pipeline at two sides symmetrically relative to its axis, and are pressed to pipeline by means of said leverage with hydraulic cylinder. Each working member is furnished with hydraulic motor arranged inside. Carriages are provided with detachable tenons in place of contact with surface of pipeline. EFFECT: improved reliability in operation. 3 cl, 4 dwg