Prefabricated Bridge Elements and Systems Innovative Projects

By Elements and Systems: Partial–Depth Deck Panels

I-45/Pierce Elevated
Location	Downtown Houston
State	TX
Completion Date	1997
Contact Person	Kenneth L. Ozuna P.E. Texas Department of Transportation Phone: (713) 802-5435 Email: kozuna@dot.state.tx.us
Description	When a 113-span section of IH 45 in Houston's central business district needed replacing, designers estimated that a conventional bridge system would require more than a year and a half of construction. Estimating user delay costs at $100,000 a day, TxDOT opted to speed construction by using precast bent caps on the existing columns. The bridge consists of twin structures, one northbound and one southbound, and each structure was completed in 95 days, a total of 226 spans replaced in 190 days. To connect the precast caps to the existing columns, the precast caps were anchored with post-tensioning bars and hardware.
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Prefabricated Elements	partial, pier
Other Keywords	Precast bent caps; precast prestressed deck panels; precast prestressed I-beams,precast deck panels with topping slab,precast pretensioned partial-depth deck panels,speed of construction
Advantages	Minimized traffic disruption: construction time was reduced from an estimated 1.5 years to 190 days, with user delay costs estimated at $100,000/day.
Related Document 1	Cap-to-Column Connection Detail Drawings (PDF, 0.5 mb) HTML Version: Sheet 1 Sheet 2 Sheet 3
Photo Credits	Texas Department of Transportation
Route 57 over Wolf River
Location	Fayette County
State	TN
Completion Date	1999
Contact Person	Edward P. Wasserman P.E. Tennessee Department of Transportation Phone: (615) 741-3351 Email: Ed.Wasserman@state.tn.us
Description	The Wolf River Bridge in Fayette County, Tennessee, crosses sensitive wetlands and carries the only east-west route through its geographic region. For the 20-span replacement bridge, the Tennessee Department of Transportation chose staged construction, maintaining one lane of traffic with timed signals. TDOT designers selected precast prestressed beams to facilitate speedy construction and allowed optional stay-in-place precast prestressed concrete deck forms. TDOT and the contractor developed details for precasting bent caps in two pieces to suit staged construction. Construction of the 1,408-foot long, 46-foot wide bridge was completed in eleven months without putting any equipment in the surrounding wetlands.
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Prefabricated Elements	partial, pier
Other Keywords	Precast bent caps; precast prestressed concrete stay-in-place deck forms; precast prestressed I beams; steel pipe piles,precast deck panels with topping slab,precast prestressed I-beams,precast pretensioned partial-depth deck panels
Advantages	Minimized environmental disruption by eliminating the need to place equipment in surrounding wetlands, and minimized traffic disruption of an important east-west corridor.
Contract Elements	"A" plus "B" format was used. The "A" portions of the bids reflected prices for construction items. The "B" portion required the contractor to identify the number of calendar days needed to complete construction, which was then multiplied by a pre-determined price per day established by the owner.
Photo Credits	Tennessee Department of Transportation
SH 249/Louetta Road Overpass
Location	Houston
State	TX
Completion Date	1994
Contact Person	Mary Lou Ralls P.E. State Bridge Engineer Bridge Division Texas Department of Transportation 125 E. 11th Street Austin TX 78701-2483 Phone: (512) 416-2183 Fax: (512) 416-3144 Email: mralls@dot.state.tx.us
Description	In the early 1990's Texas State Highway 249 was upgraded from a four-lane, at-grade road to a limited-access freeway. Consequently, two overpass structures were built at Louetta Road to carry three lanes in each direction, plus shoulders and ramp transitions. The superstructure consists of simple-span pretensioned trapezoidal-shaped 54-inch U-beams as well as precast pretensioned deck panels supported on the U-beams' top flanges with a cast-in-place composite concrete topping. The bridges are three spans each, nominally 130 ft. per span. At the interior bents, each beam is supported by a single post-tensioned pier. All beams and piers were designed and fabricated using high-performance/high-strength concrete.
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Prefabricated Elements	partial, substructure
Other Keywords	Precast pretensioned partial-depth deck panels, precast post-tensioned piers, pretensioned U-beams,precast prestressed U-beams
Advantages	Minimized traffic disruption
Photo Credits	Texas Department of Transportation
SH 36 over Lake Belton
Location	Near Waco
State	TX
Completion Date	2004
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	Because of fluctuating water surface elevations on the lake and uncertainties about performance of underwater precast column joints, designers chose a cast-in-place twin-column arrangement for replacement of the Lake Belton bridge. Twin bridges will be 3,840 feet long with 62 identical precast interior bent caps. The hammerhead bents will be some of the highest-moment-demand cap-to-column connections used yet with precast caps in Texas, presenting new design challenges. TxDOT bridge designers are developing design procedures extended for high-moment-demand connections. TxDOT has funded a 2002 Research Implementation Project to adapt and implement guidelines for multi-column bent cap connections to single-column, high-moment-demand connections and to continue development of specifications addressing grout placement, segregation, and durability.
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Prefabricated Elements	partial, pier
Other Keywords	Precast bent caps; precast prestressed deck panels; precast prestressed U-beams,precast deck panels with topping slab,precast pretensioned partial-depth deck panels
Advantages	Constructibility: A primary source of water for Waco and an important flood control resource for the area, Lake Belton's water level is highly variable, as much as 48 ft, reaching as high as the bottom of the bridge's beams on occasion. Using precast components limits construction dependence on the lake level.
Related Document 1	Interior Bent with Precast Cap and High-Moment Connection (PDF, 1.1 mb) HTML Version: Sheet 1 Sheet 2 Sheet 3 Sheet 4 Sheet 5
Photo Credits	Texas Department of Transportation
SH 361 over Redfish Bay and Morris-Cummings Cut
Location	Aransas County
State	TX
Completion Date	1994
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	This project required construction of two bridges over Redfish Bay (2,020 ft.) and the Morris-Cummings Cut (415 ft.), posing the challenge of over water work on the Texas Gulf Coast. The design included precast piling as well as a precast double-tee superstructure with 44 identical bent caps, which the contractor requested to precast. Bent caps were fabricated in Corpus Christi and used epoxy-coated reinforcing to protect against corrosion in the marine environment. They were transported by barge to the bridge site and then lifted into place over epoxy-coated reinforcing steel hairpin bars embedded in the piling to form the connections. The interface between pile and the bottom of the cap was sealed, and concrete was placed through the slot in the top of the cap to complete the connection.
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Prefabricated Elements	partial, pier
Other Keywords	Precast bent caps; precast piling,precast concrete piles/columns,precast deck panels with topping slab,precast pretensioned partial-depth deck panels
Advantages	Constructibility: Using precast caps limited the amount of time required for over water work on the Texas Gulf Coast. Minimized Traffic Disruption: Using precast caps reduced project duration by about 40%.
Related Document 1	Precast Bent Caps for SH 361 over Redfish Bay and Morris-Cummings Cut (PDF, 0.5 mb) HTML Version: Sheet 1 Sheet 2 Sheet 3
Photo Credits	Texas Department of Transportation
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.
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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: Sheet 1 - Square Sheet 2 - Round
Related Document 2	Precast Bent Cap Detail Drawings (PDF, 0.9 mb) HTML Version: Sheet 1 Sheet 2 Sheet 3
Photo Credits	Texas Department of Transportation