Hanshin Expressway Large-scale Repair Project
PC Girders:Cable Corrosion

Compact Structure to Satisfy Strict Requirements

Corrosion of PC Cables due to Water Infiltration

PC girders are designed to strongly pull the cables imbedded in the concrete to improve the strength.
Aging allows gradual entry of rainwater inside of the sheath through the ends that fix the cables, which causes rusting and expansion of cables and steel pipes that protect cables to eventually cause cracking or peeling of concrete. It ultimately ends up fracturing cables.
For these portions with serious damage, corroded cables and the damaged concrete structure are integrally repaired.