With a total distance of nearly five miles and at one point being named as the world's longest continuous over-water steel, the Chesapeake Bay Bridge is certainly a site to see. As a major outlet feeding the Baltimore-Washington DC metropolitan area which serves an estimated 61,000 vehicles daily, it’s also quite a site to maintain.
The company behind the structure’s construction and maintenance was working on bearing retrofits along the bridge’s columns. Rather than closing down lanes for several weeks, they had installed access platforms at two locations.
The Problem: With much of the maintenance material weighing several hundred pounds, they needed a way to lift the components from the access platform to the work area.
The company considered a mobile crane, but decided it was much too large and could potentially impede traffic flow.
The Solution: 2 Gorbel articulating jib cranes, one for each of the identical work areas. The 1000 pound capacity jib cranes measure 14’ of overall span (8’ for the primary arm, 6’ for the secondary). The jib model used is a freestanding design, though it installed without a supporting column in order to flush mount on the side of the bridge.
Click here for more.