METHOD FOR MAKING PILE IN GROUND Russian patent published in 1997 - IPC

Abstract RU 2081969 C1

FIELD: construction engineering. SUBSTANCE: according to method, at least from part of bore-hole depth, drill string is removed by steps. At first step, drill string is lifted to height h which is equal to 3-7 diameters of drill working member, then it is lowered to depth equal to h. At all subsequent steps, drill string is lifted to height h also equal to 3-7 diameters of drill working member, and then it is lowered to depth equal to 0.5 h. EFFECT: high efficiency. 4 cl

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RU 2 081 969 C1

Authors

Pertsovskij Mikhail Izrailevich

Dates

1997-06-20—Published

1995-09-04—Filed