FIELD: civil engineering. SUBSTANCE: concrete mortar is filled to the level of loading opening, then casing pipe is plugged at the level of said opening and knocked down until wider foot is formed in the lower part of well. Then casing pipe is withdrawn by vibratory method. Plug has the form of disc secured on horizontal axle with a provision for turning through 180 deg. Disc axle carries pulley on external side of pipe while disc retainers are installed horizontally on internal walls of pipe. EFFECT: higher efficiency. 2 cl, 6 dwg
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