By using the one-directional cantilever construction, the precast roadway, and delta frame elements, one cable stay and 236.5 [m.sup.2] of main-span cantilever could be completed in one week.
Each crane erected two box girder segments (68 t each) in cantilever and a precast delta frame (43.5 t) prior to installing the next stay.
Most notably, the precast concrete delta frames and single plane of stay cables made the selected design very economical.
Here, the two boxes are connected by a 0.25-m-thick transversely post-tensioned median slab and precast delta frames at the cable-stay anchorage locations.
The single plane of stay cables is permitted by incorporation of precast delta frames that allow the otherwise independent box girders to be supported in one central location.
The type structure chosen was a steel delta frame girder.
Contractors were allowed to bid any of the pre approved alternates or the original steel delta frame girder.
Two contractors bid the continuous composite steel plate girder and one bid the original steel delta frame girder.
The original steel delta frame girder was designed for an AASHTO HS 20 live load; however, the transportation cabinet required that all the alternates be designed for AASHTO HS 25 live load, which is 25 percent higher than HS 20.