(19)

(11)

EP 3 830 393 A1

(12)

(43) Date of publication: 09.06.2021 Bulletin 2021/23 (21) Application number: 19748604.6 (22) Date of filing: 17.07.2019

(51) International Patent Classification (IPC):  E21D 11/18(2006.01) E21D 9/00(2006.01) E21D 11/40(2006.01) E21D 11/24(2006.01) (86) International application number: PCT/IB2019/056096 (87) International publication number: WO 2020/021390 (30.01.2020 Gazette 2020/05)

(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: 27.07.2018 IT 201800007585 (71) Applicant: KEEPING TUNNEL SAFETY S.R.L. IN BREVE "KTS S.R.L." 25031 Capriolo, (BS) (IT)	(72) Inventor: GUERINI, Elio 25055 Pisogne, Brescia (IT) (74) Representative: Gamba, Alessandro  Jacobacci & Partners S.p.A. Piazza della Vittoria, 11 25122 Brescia 25122 Brescia (IT)