November 17, 2011
This project was the first of four phases in replacing the existing North Channel Bridge. Work consisted of three new in-river piers, consisting of two 8’ diameter drilled shafts and two 6’ diameter columns topped off with a conventional pier cap with two bridge seats in each.
The bridge substructure consists of 2.4m diameter drilled shaft caissons socketed 6m into bedrock. There were two caissons per pier and the work was done by our subcontractor, Case Foundation.
There are two 1.8m diameter columns per pier. Pier 1 columns are approximately 11.5m in height, Pier 2 columns are approximately 9.6m in height, and Pier 3 columns are approximately 9.7m in height.
The pier caps are 12.2m long by 2.4m wide by 1.6m tall with rounded ends on a 1.2m radius. The top surface of the caps are sloped at a two percent grade from the edges towards the center of the pier and each cap will consist of two bearings seats (but these seats are not part of this contract).