SYSTEM TO PERFORM EARTH-MOVING OPERATION UNDER BURIED PIPELINE Russian patent published in 2007 - IPC E02F5/10 

FIELD: mining and construction, particularly earth-moving operations to remove ground from under buried pipeline laid near ground surface.

SUBSTANCE: earth-moving system comprises main frame to be installed on buried pipeline and cutting tool frame supported by main one. Cutting tool frame has pair of rotary cutting tools arranged on lower side thereof and may slide with respect to main one. Main frame comprises front seat located from front side thereof in system movement direction, rear seat located behind front one and two rails extending in longitudinal direction and connecting right and left upper sides of front seat correspondingly with right and left upper sides of rear seat. Moving means adapted to guide cutting tool frame along said rails to provide mutual movement of cutting tool frame and main frame along buried pipe are also provided. Main frame has the first fixing means to secure thereof to buried pipe during cutting tool frame movement. Cutting tool frame is provided with the second fixing means to secure thereof to buried pipe during main frame movement. To excavate ground main frame and cutting tool frame may serially move along buried pipe.

EFFECT: increased ground excavation efficiency due to improved digging operation and rotary cutting tool movement.

2 cl, 10 dwg