An improved barrier forming apparatus and method whereby a barrier is formed continuously over a surface, the barrier having continuous reinforcing rods extending the length of the barrier and having cage reinforced standard supports at predetermined intervals along the length of the barrier. An improved barrier forming assembly is disclosed comprising a concrete forming member having a form cavity extending therethrough; a concrete passing member having a concrete delivery opening for passing concrete or the like to the form cavity; and a positioning assembly comprising a support shaft and a door member pivotally supported at a forward end of the concrete forming member, the barrier being extrudable continuously via the form cavity from a rearward end of the concrete forming member. The door member selectively is positionable to partially seal the form cavity at the forward end of the concrete forming member and has rod clearance channels through which the reinforcing rods pass through the door member into the form cavity when the door member is so positioned to seal the form cavity. The rod clearance channels permit the door member to clearingly pass the reinforcing rods to open the form cavity at the forward end of the concrete forming member to allow the free passage of the barrier forming assembly over the cage reinforced standard supports.

A means for towing and feeding a rail-mounted slip form paver has a self-propelled tug unit, a draw bar structure adapted to connect the unit and the paver in spaced relation, a hopper on the tug for receiving fluid concrete and including archimedes screws for delivering the fluid concrete to one end of a conveyor carried by the draw bar structure, a discharge chute at the other end of the conveyor for delivering fluid concrete in advance of the paver and a separating member between the paver and the tug unit operable to split and space continuous bundled steel rod reinforcement for incorporation in the concrete base laid by the paver.

A method for reinforcing pavement involves the orientation of a sheet of elastomeric material reinforced by a plurality of substantially parallel, high tensile strength tire cords embedded therein and bonded thereto on a roadbed so that the tire cord fibers extend in the direction of the stress on the roadbed. The elastomeric material and the tire cord fibers are bonded to the existing roadbed and the roadbed is paved.

This invention relates to a device for driving and positioning, by vibration, dowels into concrete slabs during the construction of roads, on both sides of points between said slabs and perpendicularly to said joints, comprising a horizontal beam which is provided with vibrators and with maintaining elements suitable for gripping the dowels and which is carried by an independent frame, so as to be vertically movable by displacement means above a joint, in order to drive said dowels into a lower position in the still unhardened concrete of the slabs. The device also comprises a lower smoothing plate intended to bear and slide onto the surface of the already compacted concrete slab, said lower plate having openings for the passage of the dowels and pressing guides fixed to the horizontal beam during the lowering of said horizontal beam, said elements for maintaining the dowels being connected to the horizontal beam and to the pressing guides so as to allow the horizontal beam and the pressing guides to move downwardly with respect to the maintaining elements bearing on the lower plates, so as to cause the dowels to be driven into the still unhardened concrete of the slabs.

A sliding shuttering machine for constructing continuously reinforced concrete roadways or pavements, comprising a main frame provided with transversely spaced ground engaging members allowing it to move over the ground, two lateral shutterings spaced apart transversely and extending longitudinally between the ground engaging members, a main extrusion plate extending transversely between the lateral shutterings and forming therewith a tunnel shaped sliding shuttering for extruding a mass of concrete and molding same into a thick pavement as the machine moves forward, adjustment means mounted between said main frame and said main extrusion plate for adjusting the vertical position thereof with respect to the ground and, consequently, the thickness of the concrete pavement to a desired value, an additional extrusion plate which extends transversely between the lateral shutterings and which is situated at a distance in front of said main extrusion plate and at a height with respect to the ground which is less than that of the main extrusion plate, vibrator means mounted in front of said additional extrusion plate, concrete supply and distribution means being arranged for delivering a mass of concrete in front of the main and the additional extrusion plates, and a first set of guide elements, spaced apart transversely, which are mounted under said additional extrusion plate for guiding continuous longitudinal reinforcements to be buried in the concrete pavement.