State Route 8 Bridge Replacement

The State Route 8 (SR 8) bridge, built in 1953, is a crucial infrastructure connection in Summit County, Ohio, carrying over 114,000 vehicles each day. Recognizing the importance of maintaining this key transportation link, the Ohio Department of Transportation (ODOT) has undertaken a comprehensive replacement of the bridge.

In partnership with the project team and partners, HNTB evaluated, analyzed and developed the details for bridge launching, an innovative construction solution that would ensure successful project delivery.

Understanding the Bridge Launch Method

Bridge launching involves assembling a portion of the steel girders on the ground pushing it over the abutment to the first pier using a system of rollers and hydraulic jacks. Additional portions of the girders are then added and subsequently pushed to the next pier. The process is repeated until the leading ends of the girders land on the opposite abutment and the steel girders are fully assembled.

For the SR 8 southbound structure, six launches, for six spans, were successfully completed. The northbound structure will be constructed using the same procedure once the existing bridge is demolished.

Why Bridge Launching Was the Optimal Choice

Due to the challenging terrain and a deep valley of nearly 150 feet that includes a school bus yard and critical railroad tracks, bridge launching was chosen as a more cost-effective and safer option than traditional steel erection via cranes. This innovative method helped the project team avoid the complexities and potential risks associated with crane delivery, resulting in a successful and efficient construction process. Notably, this marks the first instance of a bridge being launched on an ODOT project.

By emphasizing collaboration and innovative problem-solving, the SR 8 bridge replacement project stands as a testament to the power of teamwork and technical excellence in overcoming complex engineering challenges.