(19)

(11)

EP 0 791 121 A1

(12)

(43) Date of publication: 27.08.1997 Bulletin 1997/35 (21) Application number: 96926666.0 (22) Date of filing: 19.08.1996

(51) International Patent Classification (IPC):  A63C 19/ 00( . ) E04H 3/ 12( . ) E01C 13/ 00( . ) E01C 13/ 08( . ) E04H 3/ 14( . ) (86) International application number: PCT/NL1996/000328 (87) International publication number: WO 1997/007306 (27.02.1997 Gazette 1997/10)

(84) Designated Contracting States: AT DE ES GB NL PT SE (30) Priority: 17.08.1995 NL 19951001000 (71) Applicant: Ballast Nedam N.V. 1183 AS Amstelveen (NL)	(72) Inventors: VAN BIJSTERVELD, Jacobus, Johannes NL-2631 HZ Nootdorp (NL) VAN DER SLUIS, Hans, Robbert NL-2623 GV Delft (NL) BOOT, Cornelis, Willem NL-4322 BT Scharendijke (NL) (74) Representative: Bartelds, Erik  Arnold & Siedsma, Advocaten en Octrooigemachtigden, Sweelinckplein 1 2517 GK Den Haag 2517 GK Den Haag (NL)