EP 0578034 B1 19971015 - Method and device for drilling an earth borehole
Title (en)
Method and device for drilling an earth borehole
Title (de)
Verfahren und Vorrichtung zum Herstellen einer Erdbohrung
Title (fr)
Procédé et dispositif pour le forage d'un trou dans le sol
Publication
Application
Priority
DE 4220430 A 19920624
Abstract (en)
[origin: EP0578034A1] In a method of drilling an earth borehole, a pilot hole is first of all produced by the driving method by means of a drill head (7) arranged on the end of a driven rotary and/or push stem (5), then the drill head is replaced by a widening head (11) with a sloping surface (16) pointing against the driving direction and the pilot hole is subsequently widened against the driving direction by stripping off the earth by means of the rotating widening head. The earth accumulating in the process is removed by means of a flushing medium via a conveying or product pipe following the widening head. <IMAGE>
IPC 1-7
IPC 8 full level
E21B 6/00 (2006.01); E21B 7/04 (2006.01); E21B 7/20 (2006.01); E21B 7/28 (2006.01); E21B 10/44 (2006.01); E21B 21/00 (2006.01)
CPC (source: EP)
E21B 7/201 (2013.01); E21B 7/28 (2013.01); E21B 10/44 (2013.01); E21B 21/002 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0578034 A1 19940112; EP 0578034 B1 19971015; DE 4220430 A1 19940105; DE 4220430 C2 19940922; DE 59307531 D1 19971120
DOCDB simple family (application)
EP 93109815 A 19930619; DE 4220430 A 19920624; DE 59307531 T 19930619