- Redecking I-70 Bridges Over Kaw Drive
Our team provided fast-track design and construction services for the redecking and rehabilitation of two I-70 bridges. The bridges serve eastbound and westbound I-70 over Kaw Drive in Kansas City, Kansas. The team brought extensive interstate bridge and highway design experience to the effort, as well as a long history of successfully delivering fast-track projects for KDOT. This particular effort required the preparation of a large volume of plans in just six months. It also involved challenging traffic control issues during construction because the bridges are located in an urban area and carry approximately 103,000 vehicles each day.
During preliminary design, the team conducted on-site visits to determine the condition of the structures and identified several areas to reduce construction cost. Options included reusing portions of structures KDOT had originally thought necessary to replace, and reusing expansion and bearing devices that were in good condition.
The rehabilitation included extensive fatigue crack repairs, recoating of structural steel, substructure repairs, new concrete deck slabs and rocker bearing repairs. Shear studs were added to existing steel girders to provide composite action and reduce fatigue stress. The team also designed guardrail and concrete safety barrier transition sections between existing barrier shapes and new bridge rails.
This project was classified as significant by FHWA because of its duration and the lane reductions, which could result in significant delays. We performed queue and sensitivity analyses and recommended a phased construction approach, which allowed KDOT to keep two lanes of traffic open at all times. Detours included the closing of two system-to-system interchange ramps for the full duration of construction. One of the existing bridges was originally designed with a taper and then widened. The tapered girders limited phasing options for the bridge. The team’s innovative solutions included using the existing ramp connections and an adjacent collector-distributor road to carry one lane of traffic during the phase when only a single lane could be maintained on mainline I-70. Temporary in-pavement route shields were used to provide further clarification.
- Bridge design
- Roadway design
- Traffic control
- Traffic analysis
- Guardrail design