DRILLING-AND-DRIVING METHOD FOR PILE FOUNDATION ERECTION IN PERMAFROST GROUND Russian patent published in 2008 - IPC E02D27/35 

FIELD: construction, particularly foundations for all buildings or building structure types in permafrost ground with ground base conservation in permafrost condition during total building or building structure usage time.

SUBSTANCE: method involves drilling hole in permafrost ground with loosened ground removal from well; filling the hole with previously removed ground along with metal pile installation in hole; leaving the pile in unloaded state up to pile adhering by freezing with surrounding permafrost ground. Metal pile is made as shaft with expanded lower part to be inserted in hole. Lower pile part consists of horizontal support member fixedly connected to power pile shaft end. The horizontal support member is metal sheet and metal vertical stiffening ribs fixedly secured to upper surface of the support member and to shaft and extending in radial direction therefrom. Crushed stone, gravel or sand layer is placed on hole bottom before pile installation in hole. Said layer is compacted by dropping pile from height enough for said material compaction with expanded pile part or by pile insertion in hole and vertical load application thereto, wherein the load is enough for material compaction by expanded pile part. After that metal pile is installed in well and space between pile and hole wall is filled with several layers of thawed or frozen ground removed from hole. Frozen ground layers are thawed inside hole with the use of steam jets or other heaters. After each layer laying thawed ground between pile shaft and hole wall is compacted with ramming. After upper ground layer compaction pile is left in unloaded state up to pile freezing into surrounding ground.

EFFECT: increased quality and decreased time of pile foundation construction in permafrost ground, decreased constructional costs.

9 cl, 4 dwg