Recently, People are concerned with maintenance management of infrastructure. This report shows following some maintenance technologies of bridges which we developed and had high execution technique. (1) New under-deck inspection system using digitized image processing instead of visual inspection. (2) Investigation of design method for steel girder rehabilitation with outer cables. (3) High execution management in continuous girders remade from simple girders. (4) New exchanging method of high-strength bolt in reinforced concrete deck.
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