(19)

(11)

EP 2 861 826 A2

(12)

(88) Date of publication A3: 30.05.2014 (43) Date of publication: 22.04.2015 Bulletin 2015/17 (21) Application number: 13731305.2 (22) Date of filing: 11.06.2013

(51) International Patent Classification (IPC):  E21D 21/00(2006.01) (86) International application number: PCT/EP2013/062060 (87) International publication number: WO 2013/189785 (27.12.2013 Gazette 2013/52)

(84) Designated Contracting States: AL 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 RS SE SI SK SM TR Designated Extension States: BA ME (30) Priority: 18.06.2012 AU 2012902554 (71) Applicant: Sandvik Intellectual Property AB 811 81 Sandviken (SE)	(72) Inventor: RATAJ, Mieczyslaw Charlestown, New South Wales NSW 2290 (AU)