Work carriage for the lining of tunnels

A work carriage intended to run stepwise along a tunnel to lay a solidifiable fluid material on walls of the tunnel and allow the solidifiable fluid material to solidify for constructing a lining of the tunnel, the work carriage comprising:

• a sliding formwork with an outer surface having a shape of the lining desired on the walls of the tunnel, the sliding formwork comprising a closing board for closing, radially to the tunnel,
• a space between a front edge of the sliding formwork and a wall of the tunnel to be lined to form an interspace between the sliding formwork and the wall of the tunnel which is intended to accommodate the solidifiable fluid material against the wall of the tunnel,
• wherein the sliding formwork further comprises dispensing ports for dispensing the solidifiable fluid material and a covering mantle intended to make a surface of the interspace that is parallel to an advancement direction of the work carriage along the tunnel,
• a releasable constraint being provided between the sliding formwork and the covering mantle in order to move from a first condition, in which the covering mantle is fixed to the sliding formwork, and a second condition, in which the covering mantle slides over the sliding formwork.