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SH 66 over Mitchell Gulch: Construction Photos
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At about 7:30 PM, Friday, demolition began. The old bridge was rapidly ripped apart and moved out of the way.
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Existing timber pile piers are broken off, abutments and wingwalls are torn out.
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The first precast member, the west "hide wall" is delivered shortly after midnight.
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The hidewall is welded to the previously driven piles.
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The abutment cap is brought in to complete the abutment.
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After both abutments were placed, the backface was lined with geofabric and flowfilled.
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Rip-rap was placed concurrently with the flowfill and partially burie.
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The first girder was placed mid-morning.
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The outside girders were precast with the curb in place and the bridge rail was attached beforehand.
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After the girders were post-tensioned together, grouted, and welded to the abutment, aggregate base course (ABC) was placed and compacted.
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The bottom layer of hot bituminous pavement (HBP) was placed on the ABC, followed by geotextile with a heavy tack coat for waterproofing and abutment reinforcement.
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Another lift of HBP was placed before opening the road to traffic Sunday at 5PM.
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More Information
Contact
Reggie Holt
Office of Bridges and Structures
202-366-4596
E-mail Reggie
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Updated: 04/05/2011 | |
