Precast lining element for lining a tunnel
portion
(10) WO2025104585A1
(22) 12.11.2024
(43) 22.05.2025
(57) The invention relates to a precast lining element (1) for lining a vault portion of a tunnel. The element (1) comprises a central section (11), a first lateral section (12) and a second lateral section (13), wherein each of said sections (11, 12, 13) comprises a concrete shaped body (C1, C2, C3) having an intrados surface (11-1, 12-1, 13-1), an extrados surface (11-2, 12-2, 13-2) and a perimeter edge (11-3, 12-3, 13-3) connecting said intrados surface (11-1, 12-1, 13-1) with said extrados surface (11-2, 12-2, 13-2). The central section (11) is connected to the first lateral section (12) through first hinge means (21) and to the second lateral section (13) through second hinge means (22), wherein said hinge means (21, 22) allow said element (1) to change from a folded configuration, taken on before installation, to an open configuration, taken on upon installation. For each lateral section (12, 13), the element (1) comprises a foot section (12A, 13A), made of concrete, connected to the shaped body (C2, C3) of the respective lateral section (12, 13) through connection means (51-1, 51-2) allowing the foot section (12A, 13A) to slide between a retracted position, taken on before installation, and an extended position, taken on upon installation and defined by a rest plane (PO) defined by a surface of said tunnel. For each of said foot sections (12A, 13A), the element (1) further comprises locking means (61-1, 61-2) configured to lock the respective foot section (12A, 13A) in the retracted position and in the extended position, when the latter is reached.
(71) Tunnel Design Service SRL, IT
