| 摘要 |
PROBLEM TO BE SOLVED: To extremely easily replace a slab constituting a road bridge without causing buckling in a girder. SOLUTION: A girder reinforcing mechanism 11 is installed in a middle girder part 5. A tendon 14 composed of a steel bar 14a of the girder reinforcing mechanism 11 is tensioned to some extent by a length adjustment mechanism 41, a jack 23 of a tensioning mechanism 12 is extended, and a compressive force is applied to the lower side of the middle girder part 5 so as to reinforce it. The slab is axially cut, one side part of the slab is removed while securing a single lane of the slab, and a new slab is laid. While the passage of the vehicle is secured on a newly established slab, the residual existing slab is removed, and a new slab is laid. When the laying of the slab on the newly established slab is finished and formed into a new composite girder slab 3, a PC steel 37 is tensioned in one side of an anchor part 13, the both sides of the PC steel 37 are fixed to the anchor part 13, and the middle girder 5 is prestressed.
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