21ST STREET BICYCLE BRIDGE SPAN RANGE 80–110 FT
8” PRECAST PLANKS WITH 2” TOPPING AND WEARING SURFACE UTILIZE EXISTING ENTRANCE RAMP
5’-0” PRE-STRESSED PRECAST GIRDER AASHTO TYPE IV - F’c=8ksi, 24 0.6” STRAND REINF.
EXISTING RAMP TO BE DEMOLISHED
3’-0” DEEP PRE-STRESSED PRECAST GIRDERS SPAN OVER EXISTING RAIL TRACKS
20” DIA. PRECAST COLUMN
The 21st Street bridge would connect 21st Street across Interstate 64 and the railroad tracks to the south. The bridge would take off from a point on the existing entrance ramp for eastbound I64 after the ramp has crossed the Interstate. The new construction would start where this existing entrance ramp passes over the exit ramp for the eastbound lanes of I64. Construction after that point would follow the precast template described above. Support columns would be spaced to limit spans to approximately 80 to 110 feet. As such columns will need to be threaded in between some of the tracks in the rail yards.