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System for protecting against detachment of portions of the roof (20) of a tunnel, comprising a plurality of ropes (10) which extend longitudinally with respect to the tunnel, and are positioned transversely to it, so as to cover all potentially unstable portions of the roof (21) and intercept any detachments of concrete, said ropes (10) being anchored to the roof (20) by means of end and possibly intermediate restraints or anchors (30).

A milling machine for a road surface comprising a milling head (2) coupled to locomotion means (3), and having a drum (7) rotating according to a rotation axis (X) and equipped with tools (9) for milling the road surface. The tools (9) are coupled to the rotating drum (7) according to a helical path so as to collect and convey milling residue from the road surface in the helical path.

A measurement apparatus for longitudinal displacements or sliding of at least one rail (1), in particular a long welded rail (1). The measurement apparatus (100) comprises: a plurality of targets (111) constrained to the rail (1) and distributed along the rail (1); a respective plurality of light emitters (112) positioned on fixed supports in proximity of the rail (1), the plurality of light emitters (112) being configured to emit light references (113), the light references (113) fixed in space and respectively projected onto the plurality of targets (111); an image acquisition system (120) adapted to be mounted onboard a railway vehicle (2) and configured to frame each of the light references (113) projected onto a respective target (111); an image processing system (130) operatively connected to the image acquisition system (120) and configured to detect and measure a position of each light reference (113) on the respective target (111).