ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.
Issue link: http://www.aspiremagazinebyengineers.com/i/306162
An innovative approach from funding through design Middlebury is in the heart of Vermont and home to Middlebury College, one of the country's elite liberal arts schools. The college and the quaint town have a rich history. The Cross Street Bridge is an infrastructure wonder. From funding through design, it's a project that can serve as an example to many others desiring to integrate infrastructure improvements into the fabric of the community. The three-span Cross Street Bridge is the first major design-build transportation project in the state of Vermont, and with a center span of 240 ft, it boasts the longest simple-span precast, post- tensioned, spliced concrete girder bridge known in the United States. Otter Creek bisects the town, separating the downtown shopping district and the college from emergency services and Route 7, the major north-south highway in the region. The lone existing crossing is a narrow stone arch bridge built in the late 1800s. The need for a second bridge to alleviate traffic for residents and visitors and provide additional pedestrian and bicycle facilities was becoming more and more urgent. In addition to being the first design- build project in Vermont and the longest simple-span precast, spliced concrete girder in the country, this project is even more unique because the $16 million project received no funding from federal or state sources; it was funded entirely by the Town of Middlebury and Middlebury College. Without the additional federal requirements, the permitting process was streamlined. The fast pace of the project ultimately saved money. Ground breaking was in April 2009 and the bridge opened to the public with great fanfare in October 2010. Another innovative aspect of the project was the design-build contracting. The town hired a single team for both the construction and design engineering. The decision to use the design-build project delivery method allowed the long- awaited bridge to go from concept to completion quickly upon securing project funding. Bridge Features The center span includes five girder lines, 10 ft deep. Each line consists of three individual segments measuring 65 ft, 110 ft, and 65 ft. The span was erected using two temporary towers in the channel. A photo simulation by VHB of the bridge as envisioned. CROSS STREET BRIDGE / MIDDLEBURY, VERMONT BRIDGE DESIGN AND CONSTRUCTION ENGINEER: VHB-Vanasse Hangen Brustlin Inc., North Ferrisburgh, Vt. SPLICED GIRDER ENGINEER: Corven Engineering Inc., Tallassee, Fla. GEOTECHNICAL ENGINEER: GeoDesign Inc., Windsor, Vt. PRIME CONTRACTOR: Kubricky Construction Corp., Glen Falls, N.Y. PRECASTER AND CONCRETE SUPPLIER: J.P. Carrara & Sons Inc., Middlebury, Vt., a PCI-certified producer profile MiddleBury's Cross sTree 32 | ASPIRE , Winter 2011 Book_Win11.indb 32 1/4/11 2:34 PM