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(11)

EP 2 547 867 A1

(12)

(43) Date of publication: 23.01.2013 Bulletin 2013/04 (21) Application number: 10847636.7 (22) Date of filing: 19.03.2010

(51) International Patent Classification (IPC):  E21D 21/00(2006.01) E21D 20/02(2006.01) (86) International application number: PCT/CA2010/000382 (87) International publication number: WO 2011/113131 (22.09.2011 Gazette 2011/38)

(84) Designated Contracting States: 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 (71) Applicant: Dywidag-Systems International Canada Ltd. Saskatoon, Saskatchewan S7K 1R6 (CA)	(72) Inventors: GHARBANI, Amir Sudbury Ontario P3E 2L5 (CA) WALKER , Roland Salt Lake City UTAH 84104 (US) (74) Representative: Cunow, Gerda  Cunow Patentanwalts KG Teschnergasse 33/1/3 1180 Wien 1180 Wien (AT)