(19)

(11)

EP 4 251 808 A1

(12)

(43) Date of publication: 04.10.2023 Bulletin 2023/40 (21) Application number: 21819563.4 (22) Date of filing: 29.11.2021

(51) International Patent Classification (IPC):  E02D 31/08(2006.01) E04B 9/04(2006.01) E04B 1/02(2006.01) E04C 2/34(2006.01) (52) Cooperative Patent Classification (CPC): E02D 31/08; E04C 2/3405; E02D 27/01; E04C 2/405 (86) International application number: PCT/GB2021/053100 (87) International publication number: WO 2022/112792 (02.06.2022 Gazette 2022/22)

(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: 30.11.2020 GB 202018834 (71) Applicant: Premcrete Limited Andover Hampshire SP10 3XW (GB)	(72) Inventor: TUFFIN, Glenn Compton SO21 2AB (GB) (74) Representative: Marks & Clerk LLP  15 Fetter Lane London EC4A 1BW London EC4A 1BW (GB)