(19)

(11)

EP 0 783 612 A1

(12)

(43) Date of publication: 16.07.1997 Bulletin 1997/29 (21) Application number: 94927032.0 (22) Date of filing: 31.08.1994

(51) International Patent Classification (IPC):  E01B 27/ 04( . ) (86) International application number: PCT/IT1994/000142 (87) International publication number: WO 1996/006979 (07.03.1996 Gazette 1996/11)

(84) Designated Contracting States: GB (71) Applicant: HARSCO CORPORATION Wormleysburg, PA 17011 (US)	(72) Inventor: ROSSANIGO, Cesare I-15042 Bassignana (IT) (74) Representative: Newby, Martin John  J.Y. & G.W. Johnson, Kingsbourne House, 229-231 High Holborn London WC1V 7DP London WC1V 7DP (GB)