EP 0741227 B1 20030813 - Borehole boring method and machine
Title (en)
Borehole boring method and machine
Title (de)
Werkzeug und Verfahren zum Bohren eines Bohrloches
Title (fr)
Procédé et outil de forage d'un trou
Publication
Application
Priority
JP 10746495 A 19950501
Abstract (en)
[origin: EP0741227A2] A pilot hole (6) is drilled in a ground (1) by a first drilling unit having a rotary table (3) and a down-the-hole drill (2) (see FIG. 1A). A guide rod (7) is inserted into the pilot hole (6). A second drilling unit (8) is then mounted on the guide rod (7). This second drilling unit (8) is provided with an earth drilling bucket (19a) for drilling the ground (1), hydraulic cylinders (60) for fixing a stationary unit (10) of the second drilling unit on a wall of a target borehole (7a) in the ground (1), and another hydraulic cylinder (21) for causing the earth drilling bucket (19a) to advance. Drilling reaction force during boring work can thus be supported by both the wall of the target borehole (7a) and the guide rod (7). While being rotated, the earth drilling bucket (19a) is caused to advance over a distance corresponding to a stroke of the hydraulic cylinder (21). This operation is repeated until the target borehole (7a) is formed over its entire length. <IMAGE>
IPC 1-7
IPC 8 full level
E21B 7/00 (2006.01); E21B 7/28 (2006.01); E21B 11/00 (2006.01); E21D 1/03 (2006.01); E21D 1/06 (2006.01); E21D 3/00 (2006.01); E21D 9/00 (2006.01)
CPC (source: EP)
E21B 7/28 (2013.01); E21D 1/06 (2013.01); E21D 3/00 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0741227 A2 19961106; EP 0741227 A3 19971119; EP 0741227 B1 20030813; CN 1063515 C 20010321; CN 1136126 A 19961120; DE 69531486 D1 20030918; DE 69531486 T2 20040617; JP 3241235 B2 20011225; JP H08303169 A 19961119; KR 100354987 B1 20021228
DOCDB simple family (application)
EP 95203177 A 19951120; CN 95121807 A 19951222; DE 69531486 T 19951120; JP 10746495 A 19950501; KR 19960001659 A 19960126