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Wing Box Girder form with inner form removed. |
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Custom Concrete Form |
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The Task:
Design and build a 1,400-foot multi-span flyover highway exit ramp on a 945-foot radius. This structure would incorporate spans up to 200 feet in length, and meet Interstate Highway specifications.
The Design:
Two parallel trapezoidal winged box girders supporting a cast-in-place concrete roadway. Spans of 200 feet would be accomplished using 100-foot girders with cast-in-place end joints and post-tensioning. Portions of the structure would be over 70 feet off the ground. Each girder would weigh over 100 tons.
The Form Requirements:
Design and build a form capable of casting winged box girders on a curve, with super-elevation of the section. The girder manufacturer wanted a form that could be used for casting girders on a radius of 700 feet or more. The form was to be made so it could be set up on any curve, from 700-foot radius to a straight line. A true curve was required for the visible formed surfaces of the girders. Straight form panels were not allowed. Super-elevation was to be adjustable as required to accommodate the entire range of curvature.
The Solution:
Jones & Gardner Engineering designed and manufactured the form. The curved girders have been cast and the flyover structure, located at the intersection of I-25 and I-270 in Denver, Colorado, was completed in 2005. |
Product Summary: |
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Wing Box Girder form with adjustable curve. |
