(19)

(11)

EP 2 675 998 A1

(12)

(43) Date of publication: 25.12.2013 Bulletin 2013/52 (21) Application number: 12746712.4 (22) Date of filing: 10.02.2012

(51) International Patent Classification (IPC):  E21D 20/00(2006.01) (86) International application number: PCT/AU2012/000131 (87) International publication number: WO 2012/109700 (23.08.2012 Gazette 2012/34)

(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 (30) Priority: 16.02.2011 AU 2011900516 (71) Applicant: Rambor Pty Limited Nowra, NSW 2541 (AU)	(72) Inventor: MASTALIR, Peter Mount Pleasant, NSW 2519 (AU) (74) Representative: Durán-Corretjer, S.L.P.  Còrsega, 329 (Paseo de Gracia/Diagonal) 08037 Barcelona 08037 Barcelona (ES)