METHOD OF STRIPPING OPERATIONS Russian patent published in 2001 - IPC

FIELD: construction industry and repair of oil pipelines laid in grounds of various strength categories, including rocky and frozen grounds. SUBSTANCE: upper layer of ground is excavated by earth-moving machine, for instance, excavators. Rocky or frozen grounds are worked with the help of blast-generating plant with use of liquid expositive mixtures. For this purpose, vertical blast holes are drilled by any known tool in rows parallel to longitudinal axis of oil pipeline. Rocky or frozen ground is broken by successive blasting of single explosive charges under blast-hole generating conditions in zone from 1.5 to 0.75 m and rock pillar under oil pipeline is broken by pressure charges under high-frequency operation conditions of blast-generating plant with 150 to 1000 blasts per min and change value from 100 to 12 g in TNT equivalent. Minimal distance of working head of blast-generating plant from surface of pipeline is 0.2 m. EFFECT: intensified process of opening of oil pipelines during repair without their emptying. 2 cl, 3 dwg