Innovative Projects
By Elements and Systems: Columns
Dallas/Fort Worth International Airport People Mover |
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| Location | Dallas/Fort Worth Metroplex |
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| State | TX |
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| Completion Date | 2004 |
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| Contact Person | Katherine Berkenbile P.E.
STOA/Carlos + Law, AE
Phone: (850) 432-1912
Email: kberkenbile@gcae.com |
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| Description | DFW Airport decided to upgrade its Airport People Mover System in order to accommodate new terminals and increased passenger count. The new People Mover will transport people from the farthest terminals in 11 minutes transport time. The cost per day of casting conventional concrete columns with forms and guy wires for the reinforcing is high due to space that would be used on the airport apron. Instead of closing aircraft terminals and gates, the DFW Airport People Mover Team decided to design and build a precast post-tensioned segmental system of columns. |
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| Photo |  |
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| Prefabricated Elements | Columns |
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| Other Keywords | Precast post-tensioned segmental columns |
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| Advantages | Allowed the airport apron to remain clear of guy wires. Allowed column construction to happen at night with minimal disruption of airport traffic, Minimized traffic disruption, Improved constructibility. |
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| Photo Credits | STOA/Carlos + Law, AE |
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NASA Road 1 over I-45 |
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| Location | Houston |
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| State | TX |
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| Completion Date | 2002 |
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| Contact Person | John P. Vogel P.E.
Bridge Design Engineer
Houston District
Texas Department of Transportation
8100 Washington Avenue
Houston TX 77251-1386
Phone: (713) 802-5235
Fax: (713) 802-5350
Email: jvogel1@dot.state.tx.us |
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| Description | For replacement of this four-span, two-lane, freeway overpass, the existing profile grade could not be raised. Designers chose box beams, which provided a shallow structure depth and eliminated most deck formwork. Careful control of pile leads for plumb during 24-inch pile driving in soft clay allowed placement of piles without templates to within 2 inches of plan location. High-performance concrete was used to pour shear keys between the beams and the concrete wearing surface, and use of a concrete wearing surface readily accounted for differential beam camber. Bridge railing was slip-formed as soon as the composite concrete wearing surface achieved strength. All construction occurred during short-duration, partial, phased road closures. The existing low-clearance bridge was demolished and the new bridge completed in 10 days. |
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| Photo |  |
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| Prefabricated Elements | Columns |
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| Other Keywords | Precast piles/columns; precast prestressed beams,precast concrete piles/columns,precast prestressed box beams |
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| Advantages | Minimized traffic disruption: Trestle piles could be driven in the soft Houston clay faster than shafts could be drilled and columns poured. |
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| Contract Elements | Calendar-day definition of working day, incentive/disincentive contract, milestone completion of project phases, delayed start time to allow for fabrication of precast elements. |
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| Related Document 1 | NASA Road 1 over I-45 Bridge Layout (PDF, 0.3 mb)
HTML Version |
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| Related Document 2 | Keys to Project Success |
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| Related Document 3 | High-Performance Mix Designs |
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| Photo Credits | Texas Department of Transportation |
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