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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Drilled Shaft Industry Notes
In the May 2007 edition of Foundation Drilling Magazine, a publication of the Association of Drilled Shaft Contractors (ADSC), Silas Nichols, PE of the Federal Highway Administraton provided a summary of the FHWA’s role in providing guidance on drilled shaft design and construction over the years through research funding, publications and involvement in AASHTO and other agencies. Also in the article is an overview of upcoming updates to AASHTO codes, and FHWA publications. Read on for more details.