On the Big Sur coatline, the Pitkins Curve area of California Highway 1 (the PCH) is undergoing some improvements to help alleviate landslides and roadway instability. National Driller magazine reports on the project in their January 2011 issue. The $29.4 million project involves building a bridge in some challenging terrain to eliminate the Pitkins Curve and building a rock shed at Rainrocks. Golden State Bridge, Inc. is using pipe piles drilled into rock to support a temporary trestle. Permanent bridge foundations are 60-in diameter drilled shafts about 68-feet deep. The pile cap will be post-tensioned onto the shafts. The 240-ft center span will be built by cantilevering out from each end with a closure pour for completion. [Source: National Driller. Image: National Driller]
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The American Association of State Highway and Transportation Officials (AASHTO) just released the 2008 interims for the AASHTO LRFD Bridge Design Specifications, Customary U.S. Units, 4th Edition. These specifications govern the design of foundations for federal and state highway projects. As soon as we find out if there are any significant changes with respect to bridge foundations or retaining walls, we’ll let you know.