Drilling hole for pile foundations - involves suction pipe moved along hole widened by extensible drill tips

摘要

The appts. produces a drilled hole for pile foundations. It includes a drilling tube and drill tips with dia. extensible beyond that of the hole made by a drilling tool. These tips are displaceable along a widening guideway fastened at a predetermined angle to the bottom part of the tube, by means of a drive device. A suction pipe, sucking out and removing sand and mud, is released by the drill tip and widening drill tips. The pipe may be moved radially along the bottom of the widened hole, for complete removal of mud.