County Materials Produces Largest Bridge Girders to Date
Over the summer, County Materials began production of the company’s largest prestress concrete girders made to date in its Janesville, WI production facility. The seven-and-a-half foot tall, 152-foot-long, and 203,000 lb. girders are slated to construct the I-294, Mile Long Bridge in Chicago, IL. Construction is underway at the site, with the expectation that girder deliveries will begin in mid-November 2019. The girders are engineered to mirror a California Wide Flange girder which has been used successfully on the West Coast where earthquakes are prevalent.
The 152-foot girder is only the beginning of County Materials flexing its muscle for this massive project. Additionally, the company will be producing 186-foot girders that weigh up to 235,000 lbs. In total, County Materials will manufacture 275 girders for phase one of the project, with bidding for phase two set for a later date. Phase one includes a bridge that will carry traffic northbound over the Des Plaines River, the Chicago Sanitary and Ship Canal, several roadways, industrial areas and a railway freight yard. Phase two will include the construction of another completely new bridge that will be dedicated to southbound traffic. This larger style girder was specified for the project in order to span wider distances and ease the impact the piers will have on the environment and businesses below.
The primary challenge in manufacturing this girder is its incredible height. Coming in at 7.5 feet high, the girders required County Materials’ production team to create special scaffolding and raised platforms to work on them. In addition, the girders’ weight required new investments in cranes, rigging equipment, and chains. County Materials’ prestress team in Janesville, WI are meeting the challenge because they have experience with other large-scale and high-profile jobs.
County Materials will continue to produce California Wide Flange girders throughout the winter to meet the demands of the monumental Mile Long Bridge.
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