Method of excavating an under-reamed pile bore

Details Method of excavating an under-reamed pile bore Method of excavating an under-reamed pile bore

1983-04-01

1984-12-18

Novosad, Stephen J.

Boring or penetrating the earth

Processes

175265, 175285, 175325, 405237, E21B 1032, E21B 1030

Patent

active

044886063

ABSTRACT:
An under-reaming pile bore excavator by which a straight pile bore is first excavated vertically to a given depth by rotating the main drill bits and the under-reamed bore is next excavated downward and outward into a given shape by rotating the slidable wing bits. The under-reaming pile bore excavator of the present invention comprises a plurality of guide rails, and a plurality of slidable wing bits mounted on the guide rails which excavate the under-reamed bore, in addition to the conventional main drill bits which excavate the straight pile bore. In using the under-reaming pile bore excavator of the present invention, it is possible to obtain a stable impermeable soil surface on the excavated bore to prevent water from penetrating into the soil wall and to prevent lumps of soil from being dislodged therefrom.

REFERENCES:
patent: 3112802 (1963-12-01), Amann et al.
patent: 3938598 (1976-02-01), Watts
patent: 4046205 (1977-09-01), Asayama
patent: 4193462 (1980-03-01), Blaschke et al.

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