north tarrant express - segment west
sh 183 to ih 35W
fort worth, Texas
This $2.5 billion design-build project rebuilt several of Tarrant County’s most congested highways (IH820, SH121, and SH183) to improve mobility by increasing the existing road capacity with a combination of general purpose lanes, continuous frontage roads, and managed toll lanes. Aguirre & Fields designed 12 bridges, ancillary illumination/tolling/signage (ITS) structures, and 65 retaining walls on the 6.4-mile West Segment, which runs from the IH35W interchange to the SH183 split along IH820 (crossing three cities of Fort Worth, Haltom City and North Richland Hills).
Aguirre & Fields was the Bridge Lead for the dual-office production and package deliveries of 11 bridges: a 4,000-foot direct connector from IH820 westbound to SH183 southbound, seven concrete girder bridges at Big Fossil Creek including two braided ramp systems, and three slab-beam bridges at Singing Hills Creek. The braided ramps and direct connectors included post-tensioned straddle bents. We also prepared the preliminary schematic arrangement for two direct connector bridges at the SH183 split taking into account geometric and utility clearance requirements.
Additionally, Aguirre & Fields was the project’s Retaining Wall Lead responsible for geometric layout and design of 65 retaining walls including 47 MSE walls, 10 cast-in-place spread footing walls, five drilled shaft walls, two noise walls, and one free-standing wall. Two of the drilled shaft walls are under DART and UPRR underpass bridges requiring AREMA railroad surcharge be incorporated in the wall design. Duties required frequent coordination with the geotechnical engineer, contractor, and bridge designers.
Aguirre & Fields also supervised design of 93 drilled shaft foundations for various ITS equipment poles including: closed circuit television (CCTV), microwave vehicle detector (MVD), dynamic message sign (DMS), and automatic vehicle identification (AVI). DMS signs were arranged in cantilever, center-mount, and overhead sign bridge configurations. Additionally, Aguirre & Fields designed foundations for 10 toll gantry structures (COSS and OSB) and 57 high-mast poles ranging in height from 150-feet to 175-feet.
Aguirre & Fields was the engineer-of-record for the DC’s steel superstructure. Due to the tight radius of the roadway, the steel plate girder superstructure was placed on a flatter radius that that of the roadway to prevent uplift while also providing the most economical structure.
Photos Courtesy of AECOM