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Pennsylvania Department of Transportation District 8
Pennsylvania Department of Transportation
In 2005, PennDOT District 8 rehabilitated a failing 18-ft. X 12-ft. concrete arch structure on SR 422 built in 1926. The aging structure was sliplined using a 17-ft. X 8-ft.-10-in. Contech Aluminum Structural Plate Arch.
The new corrugated 0.225-in. thick Aluminum Structural Plate Arch was pulled into the host structure on new cast-in-place slotted concrete footings. Once the plate structure was in position, bulkheads were placed at the headwalls and grout was pumped through 2-in. grout ports into the void between the original and new structures. The project was completed in less than 60 days with no road closure or detour necessary.
This sliplining technology can be used to rehabilitate structures of all geometries. The technique is a very cost effective solution for structure rehabilitation, especially for deep buried structures under heavily traveled interstates and roads.
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