civil engineering

1. A deck system for building a bridge superstructure, the deck system having a plurality of support beams extending longitudinally along the length of the bridge, and erected at predetermined spaced locations across the width of the bridge to define a separation, the support beams each having a plurality of beam anchors secured to the support beams; screed adjustors provided in pairs for disposing on opposed lateral edges of the support beams; precast concrete slabs having a width for spanning said separation between the support beams, and being disposed end to end in abutting relationship, the slabs having a plurality of slab reinforcement bars disposed within the slabs at spaced intervals along the lengths of the slabs, the slab reinforcement bars having free extremities which protrude from the slabs on opposite lateral sides thereof to lie over said support beams, and a selected number of said slab reinforcement bars additionally having portions which extend upwardly above an operatively upper surface of the slabs at regular spaced intervals to define slab anchors for securing a concrete topping to be poured onto the precast concrete slabs; deck reinforcement bars for coupling the precast concrete slabs to the beam anchors; and ties for securing the deck reinforcement bars to the beam anchors and to free extremities of the slab reinforcement bars. 

2. A deck system according to claim 1 having a plurality of precast concrete slabs each having rectangular upper and lower faces defining a pair of long sides and a pair of short sides, the short sides being somewhat recessed to define a chamfer on forward and trailing edges extending between the support beams for the precast concrete slabs to abut one another when placed end to end and provide a flush upper surface to support a concrete topping. 

3. A deck system according to claim 1 having a plurality of precast concrete slabs each having parallel lateral edges, and forward and trailing edges for abutting on adjacent precast concrete slabs, a selected number of slabs having a forward edge which is inclined relative to a respective trailing edge and a selected number of slabs having a trailing edge which is inclined relative to a respective forward edge. 

4. A deck for a bridge superstructure having a plurality of support beams extending longitudinally along the length of the bridge, and erected at predetermined spaced locations across the width of the bridge to define a separation, the support beams each having a plurality of beam anchors secured to the support beams and screed adjustors disposed in pairs on opposed lateral edges of the support beams, the deck having: a plurality of precast concrete slabs disposed end to end with forward and trailing edges abutting one another along the length of the associated support beams, the precast concrete slabs having a width for spanning said separation between the support beams, the slabs having a plurality of slab reinforcement bars disposed within the slabs at spaced intervals along the lengths of the slabs, the slab reinforcement bars having free extremities which protrude from the slabs on opposite lateral sides thereof to lie over said support beams, and a selected number of said slab reinforcement bars additionally having portions which extend upwardly above an operatively upper surface of the slabs at regular spaced intervals to define slab anchors for securing a concrete topping formed in situ on the precast concrete slabs; deck reinforcement bars coupling the precast concrete slabs to the beam anchors; ties securing the deck reinforcement bars to the beam anchors and to free extremities of the slab reinforcement bars; and a concrete topping formed in situ on the precast concrete slabs. 

5. A deck according to claim 4 in which the precast concrete slabs have parallel lateral edges, a selected number of slabs having a forward edge which is inclined relative to a respective trailing edge and a selected number of slabs having a trailing edge which is inclined relative to a respective forward edge.