Interstate 10 was widened from four to six lanes and the twin bridges carrying I-10 over SR-281 were replaced with a single new bridge structure. Minor horizontal geometric revisions to the future six-lane section of SR-281 beneath the I-10 overpass were incorporated in the design to accommodate center piers for the new bridge structure. A revised typical section package and an updated border-width design variation were submitted and approved.
The new bridge structure over SR-281 is a 159.5-foot long double-span bridge supported by FIB 36 precast, pre-stressed concrete beams, and end bents constructed on Mechanically Stabilized Earth (MSE) walls. The bridge was designed and constructed to accommodate the future six-lane typical section of SR-281. Drainage improvements and signal upgrades at the ramp terminal intersections were part of the construction as well.
The geotechnical design consisted of further evaluations of the existing subsurface soils utilizing DMT soundings in conjunction with the existing project soils data for roadway and embankment design. The resulting test data was utilized to determine where predicted total settlement would exceed the RFP design requirements. Remediation of these areas exceeding the specified RFP requirements required subsurface soil improvements.
Rigid inclusions were installed at depths ranging from 35 to 45 feet below predevelopment grades and spaced as close as four feet on-center to ensure settlement requirements were met. Special wall and bridge foundation designs were also incorporated to minimize the effects of the compressible clay substrata.
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WGI is a national design and professional services firm leading in technology-based solutions for the construction of public infrastructure and real estate development. At WGI, we’re providing Tomorrow’s Infrastructure Solutions Today.
WGI received the Best in Construction in the category Design-Build Award for collaboration on the I-95 Diverging Diamond Interchange at St. Johns Heritage Parkway project in Brevard County, District 5.
On too many highways, both state and federal, there aren’t enough rest areas to serve the needs of high volume truck traffic mandated to take a break. WGI’s team is ready to change that.
WGI is entering the second year of our second five-year design support continuing services contract with the FDOT and Motor Carrier Size and Weight (MCSAW). This marks seven continuous years that WGI has provided design services to support the MCSAW objective of preserving Florida’s highway infrastructure.
Design-Build Team Owner: Florida Department of Transportation District 1 Design-Builder: The Ajax and WGI DB Team Engineer: Wantman Group, Inc. Specialty Contractor: Florida Safety Contractors,
WGI’s Kali McNeile and David Lutz recently presented their 3D Bridge Modeling Case Study at the 2020 ACEC-FL Annual Conference Webinar Series.
Melissa’s addition to the team solidifies WGI’s leadership in helping communities harness the benefits of much-needed infrastructure projects throughout the nation.
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