(19)

(11)

EP 1 805 374 A1

(12)

(43) Date of publication: 11.07.2007 Bulletin 2007/28 (21) Application number: 05776352.6 (22) Date of filing: 24.08.2005

(51) International Patent Classification (IPC):  E02D 3/12(2006.01) (86) International application number: PCT/EP2005/009112 (87) International publication number: WO 2006/037403 (13.04.2006 Gazette 2006/15)

(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 NL PL PT RO SE SI SK TR (30) Priority: 01.10.2004 GB 0421841 (71) Applicant: Construction Research & Technology GmbH 83308 Trostberg (DE)	(72) Inventor: FENG, Qiu CH-8902 Urdorf (CH)