Abstract
The objective of the present paper is to demonstrate a waterproof and rust prevention technique on concrete filled I-beam grid slab (Ohmishima Bridge). Ohmishima Bridge is the first bridge constructed by the Honshu-Shikoku Bridge Authority to span the strait. Although the concrete filled I-beam grid slab of Ohmishima Bridge was covered with a water-proof layer on its upper surface, it has shown the leakage of water from its bottom surface since several years passed after the bridges had opened to the public. To cope with this, an investigation was carried out on the mechanism of water leakage and counterplan to prevent leakage from the paved surface. And the concrete filled I-beam grid slab was newly repaired by the waterproof and rust prevention method.
