Method and device for boring holes

Details Method and device for boring holes Method and device for boring holes

1999-12-17

2000-11-14

Pezzuto, Robert E.

Boring or penetrating the earth

Processes

Boring with specific fluid

175 57, E01B 720

Patent

active

061456012

ABSTRACT:
A process and device for boring holes in soil or rocks, in particular for percussion or rotary percussion boring. A bore hole is formed by an annular drill bit mounted on boring rods and at the same time a jacket tube which surrounds the boring rods with a certain gap is introduced. The annular drill bit is flushed during boring by a flushing medium fed into the annular gap defined between the boring rods and the jacket tube. When boring is completed, a setting suspension is fed into the annular gap to form an anchorage with the boring rods. An anchorage can thus be obtained in a simple and reliable manner immediately after a bore hole is completed, in particular in loose or slack material, by a device having a simple design.

REFERENCES:
patent: 3638433 (1972-02-01), Sherard
patent: 3949561 (1976-04-01), Chapman
patent: 4253781 (1981-03-01), Fischer et al.
patent: 4979848 (1990-12-01), Sauer
patent: 5129470 (1992-07-01), Issakainen

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