Abstract: The locking device comprises a support plate (3) perforated by at least one flared opening (4), into which there penetrates a wedge (5) of complementary shape which is crossed axially by the reinforcement (2) with which it comes to engage by an internal toothing (12). The wedge (5) is intended to be driven by force into the opening (4) by an initial pressure and then by the tension of the reinforcement (2), and comprises on at least a part of its external surface an anti-return toothing (13) which is intended to come to engage with the wall (7) of the opening (4) of the support plate (3) when this wedge (5) has been driven into said opening (4). This toothing (13) has, in the direction of the length of the wedge (5), toothed zones (13a) alternated with recessed untoothed zones (13b). Used in particular for locking an elongated reinforcement under tension, such as a tension rod, strand, cable or similar, in particular in a work made of prestressed concrete.

Abstract: A tool (23) for extruding a paved surface (39) is located behind tracks (2) and may thus have a width which is greater than the overall width perpendicular to the tracks. The tool is carried by a bridge frame (27) articulated on the frame (1), carried by the tracks, according to a transverse axis (X--X). At the rear, the bridge frame (27) rests on the freshly paved surface (39) via air cushions (32). A hauled rule (58) emits a ray (63) parallel to the surface (39) as detected by the rule. A detector (64) carried by the tool (23) and receiving the ray (63) detects the position in respect of height of the bed (23) relative to the surface (39). Jacks (38) correct the position in respect of height of the tool as a function of this detection. A ballast (42) is displaced automatically along the bridge frame (27) in order to adjust the pressure in the air cushions ( 32).