
A new method of
conveying cable stays through bridge pylons without permitting them to interact
with one another is giving rise to bridges with longer spans and more inspiring
designs that nonetheless respect budget constraints as well as maintenance and
life-span requirements.
By W. Denney Pate, P.E., M.ASCE, and W. Jay
Rohleder, Jr., P.E., S.E., M.ASCE,
Photos: FIGG,
all
The Penobscot Narrows Bridge and Observatory—which
houses the tallest public bridge observatory in the world in one of its
pylons—carries U.S. Route 1 along the Maine coastline. The cradles for this
bridge were positioned within framework to secure them in their exact positions
on the ground; the framework was then lifted into place within each
cast-in-place pylon.
t is said that necessity is the mother of all
invention. If that is the case, then the need for striking, elegant cable-stayed
bridges that can span greater lengths and be more easily
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