Prefabricated Bridge Elements and Systems
SH 66 over Lake Ray Hubbard | |
|---|---|
| Location | Near Dallas |
| State | TX |
| Completion Date | 2002 |
| Contact Person | Lloyd M. Wolf P.E. Design Branch Manager Bridge Division Texas Department of Transportation 125 E. 11th Street Austin TX 78701 Phone: (512) 416-2279 Fax: (512) 416-2557 Email: lwolf@dot.state.tx.us |
| Description | After 40 years of service, the narrow two-lane crossing of SH 66 over Lake Ray Hubbard had become a congested route for commuters in the suburbs east of Dallas and needed to be replaced. In 2000, construction began on a pair of conventional prestressed concrete I beam bridges with lengths of 10,280 and 4,360 feet. After the project was let for construction, the contractor asked to precast the substructure bent caps as an alternative to the original design of cast-in-place multi-column bents to reduce the amount of time the workers would need to operate near power lines. TxDOT designed a precast bent cap option that included a cap-to-column connection and a specific construction procedure that allowed early placement of caps and prestressed beams based on achieved cap concrete and cap grout connection strength. The connection design included reinforcing steel dowel bars that protrude from the columns into the precast caps via open plastic ducts that are grouted after cap placement. On this project a total of 43 bent caps will be precast. |
| Photo |  |
| Prefabricated Elements | partial, pier |
| Other Keywords | Precast bent caps; precast prestressed deck panels; precast prestressed I-beams |
| Advantages | Work zone safety: reduced amount of time required for work near power lines and reduced work time overwater (80% of work on caps was done on the ground).; Minimized traffic disruption: Using precast caps produced a saving of 5-7 days per cap, distributed across activities associated with formwork, curing, steel, inspection, and bearing seats.; Improved constructibility. |
| Related Document 1 | Precast Bent Cap Column (Square and Round) Drawings (PDF, 0.6 mb) HTML Version: |
| Related Document 2 | Precast Bent Cap Detail Drawings (PDF, 0.9 mb) HTML Version: |
| Photo Credits | Texas Department of Transportation |
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