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Innovative Projects

By Elements and Systems: Substructure

Epping 13940

LocationMill Street over Lamprey River
StateNH
Completion DateAugust 24, 2004
Contact PersonPeter 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.

Photoprecast footings, in place. Click for larger version precast abutment stem and wings erected. Click for larger version precast butted box beams placed on precast abutment stem during erection. Click for larger version completed structure. Click for larger version Offset joints - stem and footing. Click for larger version Grouted splice sleeves and grout gaps to allow grout to flow. Click for larger version
Prefabricated ElementsFootings, wings, abutment stems, and beams, substructures
Other KeywordsPrecast prestressed box beams, speed of construction,total substructure prefabrication
AdvantagesRapid assembly time may preclude the need for a detour., traffic disruption

SH 249/Louetta Road Overpass

LocationHouston
StateTX
Completion Date1994
Contact PersonMary 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
DescriptionIn 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.
PhotoSH 249/Louetta Road Overpass
Prefabricated ElementsTotal substructure systems; decks
Other KeywordsPrecast pretensioned partial-depth deck panels, precast post-tensioned piers, pretensioned U-beams,precast prestressed U-beams
AdvantagesMinimized traffic disruption
Photo CreditsTexas Department of Transportation
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Contact

Vasant Mistry
Office of Bridge Technology
202-366-4599
E-mail Vasant

 
 
This page last modified on 05/12/08
 

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United States Department of Transportation - Federal Highway Administration