Innovative Projects
By Elements and Systems: Substructure
Epping 13940 |
Location | Mill Street over Lamprey River | State | NH | Completion Date | August 24, 2004 | Contact Person | Peter E. Stamnas, P.E. New Hampshire Department of Transportation Phone: (603) 271-2731 Email: pstamnas@dot.state.nh.us | Description | The 115' single span butted box precast elements were placed on an entirely precast substructure. Nine precast footings pieces were leveled using leveling screws and then grouted in place. Full moment connections were created between wing and abutment stems to precast footings by means of grouted splice sleeves. The connections were cured overnight, , the substructure was backfilled and the butted box beams were placed. The joints between beams were grouted and transversely post-tensioned. Finally, the deck surface was membraned and paved, and rail was placed. It took less than eight days from the time the first precast footing was lifted from the trailer to the time when the bridge was opened to traffic. The contract included a 14 day requirement to open bridge to traffic with an incentive/disincentive of $5,000/day. The contractor received a $30,000 incentive bonus. | Photo |
| Prefabricated Elements | Footings, wings, abutment stems, and beams, substructures | Other Keywords | Precast prestressed box beams, speed of construction,total substructure prefabrication | Advantages | Rapid assembly time may preclude the need for a detour., traffic disruption |
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. | Photo | | Prefabricated Elements | Total substructure systems; decks | 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 |
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