A major construction feat was recently completed at the Highway 61 bridge project in Hastings, Minnesota when the 545-foot, 6.5 million-pound main bridge span was hoisted into place, 50 feet above the Mississippi river. The main span, the longest free-standing tied-arch in North America, was constructed on the shore of the Mississippi River, about a mile upstream of the river crossing. Placed on massive dollies, the span was rolled onto a set of six barges and floated downstream. Once positioned under the piers, hydraulic jacks on top of the piers slowly lifted the span into place. Around midnight on Sunday, September 23rd, 2012, the lift was complete. By noon of the following day the span was secured in place and the existing bridge was reopened to traffic. A time lapse video of the entire process can be viewed below or on YouTube.
Links to news stories published about the main span lift:
Some new pictures of the Hastings bridge project in Hastings, Minnesota have been added to our Picasa Web Album: Hastings Bridge Construction. The pictures were taken by myself, David Graham, who has been in the area working on a load test program for a new bridge crossing the St. Croix River near Stillwater, Minnesota, and Griff Wigley, our blog coach who lives nearby in Northfield, Minnesota. The pictures show some of the recently poured deck sections, the completed piers, and the main span arch construction. Once completed, the main span arch will be moved onto barges, floated downstream, and lifted into place in one piece. We have chronicled this interesting and successful project in several previous blog posts that can be found here.
Specialists in Deep Foundation Design, Construction, and Testing and Slope Stability Problems