(19)

(11)

EP 2 334 881 A1

(12)

(43) Date of publication: 22.06.2011 Bulletin 2011/25 (21) Application number: 09812743.4 (22) Date of filing: 09.09.2009

(51) International Patent Classification (IPC):  E04C 2/292(2006.01) (86) International application number: PCT/FI2009/050722 (87) International publication number: WO 2010/029217 (18.03.2010 Gazette 2010/11)

(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 Designated Extension States: AL BA RS (30) Priority: 12.09.2008 FI 20085860 (71) Applicant: Rautaruukki OYJ 00810 Helsinki (FI)	(72) Inventor: LAUTSO, Kari FI-00100 Helsinki (FI) (74) Representative: Söderman, Lisbeth Karin et al Borenius & Co Oy Ab Tallberginkatu 2 A 00180 Helsinki 00180 Helsinki (FI)