Soundness Inspection of the "Jyugou Bridge", Japan's First Post-Tensioning PC Bridge
By K. Amaya, M. Hara, M. Yoshida and T. Abe
Concrete Journal, Vol.52, No.12, Dec. 2014
- Synopsis
- The Jyugou Bridge is Japan's first post-tensioning PC road bridge. This historic bridge marked its 60th birthday in 2013 and remains in service to this day. A detailed inspection of the Jyugou Bridge was carried out recently to evaluate its soundness. The inspection of prestressing steel, etc., was conducted on the Itoshiro Bridge, a bridge that was built four months after the Jyugou Bridge using the same material, and which collapsed due to flood damage. The inspection showed the concrete to be dense and of high strength, with no degradation progress. Further, the quality of the reinforcing bars and prestressing steel and the grout condition was verified, and it was established that sixty years after its construction, the Jyugou Bridge remains sound.
- Keywords:
- prestressed concrete bridge, soundness inspection, ultrasound propagation velocity, air permeability coefficient, grouting performance
