(19)

(11)

EP 2 160 504 A1

(12)

(43) Date of publication: 10.03.2010 Bulletin 2010/10 (21) Application number: 07834912.3 (22) Date of filing: 12.10.2007

(51) International Patent Classification (IPC):  E21D 9/00(2006.01) E21F 13/00(2006.01) (86) International application number: PCT/PT2007/000044 (87) International publication number: WO 2009/002199 (31.12.2008 Gazette 2009/01)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK RS (30) Priority: 25.06.2007 PT 10376907 (71) Applicant: Pompeu Santos, Silvino 1600-419 Lisboa (PT)	(72) Inventor: Pompeu Santos, Silvino 1600-419 Lisboa (PT)