(19)

(11)

EP 2 638 221 A1

(12)

(43) Date of publication: 18.09.2013 Bulletin 2013/38 (21) Application number: 11779412.3 (22) Date of filing: 08.11.2011

(51) International Patent Classification (IPC):  E04F 13/06(2006.01) (86) International application number: PCT/EP2011/069588 (87) International publication number: WO 2012/062722 (18.05.2012 Gazette 2012/20)

(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: 08.11.2010 US 411125 P (71) Applicant: Construction Research & Technology GmbH 83308 Trostberg (DE)	(72) Inventors: EGAN, William F. Ponte Vedra FL 32082 (US) SMITH, David Middleburg FL 32068 (US)