Prefabricated Bridge Elements and Systems
SH 66 over Mitchell Gulch | |
|---|---|
| Location | SH 66 over Mitchell Gulch between Franktown and Castle Rock |
| State | CO |
| Completion Date | 2002 |
| Contact Person | Wes Goff P.E. Phone: (303) 757-9116 Email: wes.goff@dot.state.co.us |
| Description | Originally designed as 3 box culverts, the Colorado Department of Transportation accepted a value-engineering proposal for this replacement bridge to minimize traffic impact. The alternate structure has a single span with side-by-side precast slab girders welded onto precast abutments and wings welded to driven-steel H piles. Piles were driven in advance outside the existing bridge. Railing was precast into the outside girders. Except for the steel H-pile supports, the entire bridge substructure was composed of precast concrete elements. Each abutment consisted of a lower and upper backwall unit. Each of the four wingwalls for the bridge was a separate precast piece. The precast substructure units were attached in the field by welding together embedded plates precast into the elements. The bridge superstructure consisted of eight precast deck girder units each 5'-4" wide, 1'-6" deep, and 38'-4" long. The deck girders were placed on the completed abutments and then transversely post-tensioned and grouted together. The outside deck girders were constructed with integrated bridge railing to avoid the need for a separate railing installation operation in the field. Construction detours as a result of this project were reduced by the value-engineering proposal from an estimated two-to-three months to less than 48 hours. |
| Photo |  |
| Prefabricated Elements | total |
| Other Keywords | Precast railing, precast retaining walls,totally prefabricated bridges |
| Advantages | Minimized traffic impact, improved work-zone safety by reducing work-zone time from several months to a weekend. |
| Related Document 1 | Construction Photos (PDF, 0.4 mb) HTML Version |
| Photo Credits | Colorado Department of Transportation |
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