The drilled shaft foundations for the kcICON bridge over the Missouri River have been completed according to Dan Brown and Associates, LLC, the geotechnical engineers on the job. The 1700-ft long bridge conveys the I-29/35 over the River with the central spans being cable-stayed and supported by a single pylon in the river. The foundations for the central pylon consist of 8 10.5-ft diameter shafts socketed into bedrock. The land-based bents are supported on 6.5 to 8-ft diameter shafts and the abutments are on driven piles. Some of the drilled shafts were post-grouted as well. The project is scheduled for completion in the summer of 2011. Find much more about the project at the DBA website. (Photo by Dan Brown and Associates)
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[Editor] The Delaware Department of Transportation (DelDOT) had a major problem on their hands after a bridge on I-495 was leaning…one side of the bridge was 18 inches higher than the other. The culprit? A pile of fill adjacent to the bridge was loading soft soils beneath. So what do you do about it? In this contributed article by Dennis M. O’Shea, bridge engineer in the FHWA Delaware Division Office, he describes the problems faced by DelDOT, the causes, and how they fixed it. The article originally appeared in Public Roads Magazine, and is republished here with permission. [/Editor]
Barry J. Meyer, P.E. joins Dan Brown and Associates
Shoring retaining wall failure in Virginia prompts apartment building evacuation
On Sunday evening, a soldier pile lagging wall shoring system failed at the Sedona & Slate residential development construction site in Rosslyn, Virginia (Arlington County). There were no reported injuries, but an adjacent apartment building was evacuated as a precaution and a nearby street is closed to traffic. Click through for a video that shows some additional views of the damage. The scale of the wall is apparent when you see the shots with workers putting braces near the bottom of the wall. I’m guessing the rakers shown in this image were added monday to attempt to stabilize the wall, but that’s just speculation at this point. Image: MyFoxDC.com