Global Patent Index - EP 2370660 A4

EP 2370660 A4 20180221 - METHOD AND APPARATUS FOR DOWN-THE-HOLE DRILLING

Title (en)

METHOD AND APPARATUS FOR DOWN-THE-HOLE DRILLING

Title (de)

VERFAHREN UND VORRICHTUNG FÜR BOHREN IM BOHRLOCH

Title (fr)

PROCÉDÉ ET APPAREIL DE FORAGE EN FOND DE TROU

Publication

EP 2370660 A4 20180221 (EN)

Application

EP 09832986 A 20091013

Priority

  • FI 2009050820 W 20091013
  • FI 20086206 A 20081217

Abstract (en)

[origin: WO2010070190A1] The invention relates to a method for down-the-hole drilling, the drilling being carried out by an apparatus, having a drilling device (1) that comprises a casing part (2) and at least during a drilling situation an essentially inside thereof existing drilling unit (3), at the drilling head of which there are at least first drilling means (4) for drilling a center hole, second drilling means (5) for reaming the center hole for the casing part (2) and a pneumatic flushing flow arrangement (6) for leading of drilling waste by influence of pressurized air at least partly upward, whereby the first drilling means (4) are coupled with the second drilling means (5) first of all power-transmittedly in order to carry out cooperation thereof at least during a drilling situation with the second drilling means (5) for a rotational motion (w4), a feeding motion (z4) and/or a hammering motion (t4), and on the other hand removably in order to enable removal thereof from the hole. Furthermore the casing part (2) is arranged to be drawn into a hole to be drilled by the drilling unit (3). Particularly direct aiming of a flushing air flow (HV) at the soil is being prevented by directing the flushing air at an end of the drilling unit (3) into a counterpart surface arrangement (X) on the drilling surface (Pl and/or P2) existing of the first and/or second drilling means in order to decrease kinetic energy of the flushing air flow (HV) by changing its flow direction on the drilling surface prior to drifting thereof into the ground. The invention relates also to an apparatus applying the method.

IPC 8 full level

E21B 10/38 (2006.01); E21B 7/20 (2006.01); E21B 10/26 (2006.01); E21B 10/60 (2006.01); E21B 21/16 (2006.01)

CPC (source: EP US)

E21B 7/20 (2013.01 - EP); E21B 10/265 (2020.05 - EP US); E21B 10/38 (2013.01 - EP); E21B 10/60 (2013.01 - EP); E21B 21/16 (2013.01 - EP)

Citation (search report)

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

DOCDB simple family (publication)

WO 2010070190 A1 20100624; EP 2370660 A1 20111005; EP 2370660 A4 20180221; EP 2370660 B1 20200715; FI 20086206 A0 20081217

DOCDB simple family (application)

FI 2009050820 W 20091013; EP 09832986 A 20091013; FI 20086206 A 20081217