(19)

(11)

EP 0 628 114 A1

(12)

(43) Date of publication: 14.12.1994 Bulletin 1994/50 (21) Application number: 93903108.0 (22) Date of filing: 02.02.1993

(51) International Patent Classification (IPC):  E02D 5/ 80( . ) E21D 21/ 00( . ) (86) International application number: PCT/AU1993/000044 (87) International publication number: WO 1993/015279 (05.08.1993 Gazette 1993/19)

(84) Designated Contracting States: BE DE ES FR GB SE (30) Priority: 31.01.1992 AU 19920000632 (71) Applicant: BHP STEEL (AWI) PTY. LTD. Sydney, NSW 2000 (AU)	(72) Inventor: RENWICK, Maxwell, Thomas Mangerton, NSW 2500 (AU) (74) Representative: Jenkins, Peter David, et al  PAGE WHITE & FARRER 54 Doughty Street London WC1N 2LS London WC1N 2LS (GB)