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(11)

EP 3 449 097 A1

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(43) Date of publication: 06.03.2019 Bulletin 2019/10 (21) Application number: 16791668.3 (22) Date of filing: 26.09.2016

(51) International Patent Classification (IPC):  E21D 21/00(2006.01) (86) International application number: PCT/IB2016/001480 (87) International publication number: WO 2017/187219 (02.11.2017 Gazette 2017/44)

(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: MA MD (30) Priority: 28.04.2016 CZ 20160244 (71) Applicant: DSI Underground IP Holdings Luxembourg Sarl 2449 Luxembourg (LU)	(72) Inventor: CHROBÁK, Vladimír 739 12 Celadná 149 (CZ) (74) Representative: Soukup, Petr  tr. Svobody 43/39 779 00 Olomouc 779 00 Olomouc (CZ)