(19)

(11)

EP 3 601 675 A1

(12)

(43) Date of publication: 05.02.2020 Bulletin 2020/06 (21) Application number: 18721438.2 (22) Date of filing: 22.03.2018

(51) International Patent Classification (IPC):  E01C 11/04(2006.01) E03F 3/04(2006.01) E01C 11/22(2006.01) E04B 1/68(2006.01) (86) International application number: PCT/GB2018/050749 (87) International publication number: WO 2018/172778 (27.09.2018 Gazette 2018/39)

(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 Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 23.03.2017 GB 201704603 (71) Applicant: Grass Concrete Limited Wakefield, West Yorkshire WF2 7RE (GB)	(72) Inventor: HOWDEN, Robert Ellis Wakefield Yorkshire WF3 4HX (GB) (74) Representative: Wilson Gunn  Blackfriars House The Parsonage 5th Floor Manchester M3 2JA Manchester M3 2JA (GB)