| 摘要 |
<p>PROBLEM TO BE SOLVED: To shorten a period necessary for traffic regulation.SOLUTION: In a bridge configurated so that main girders 2 are provided on sub-structures 1a, 1b and RC floor slabs 5 are mounted on upper sides of upper flanges 2a of the main girders 2, a new steel floor slab 11 and a side floor slab 15 are mounted on the upper part of a web 2b of the main girder 2 on a lower position of the RC floor slabs 5. Next, the RC floor slabs 5 are removed at a time to expose the new steel floor slab 11 and the side floor slab 15, a pavement is laid on the upper surface thereof, the new steel floor slab 11 and the side floor slab 15 are jacked up along with the main girder 2, and thus the height position of an upper surface of the pavement is returned to its original state to a height position of a pavement laid on the RC floor slabs 5 before the removal. A period necessary for traffic regulation is shortened by setting the traffic regulation to be from removal work of the existing RC floor slabs 5 and pavement work of the upper surfaces of the new steel floor slab 11 and the side floor slab 15 to jack-up work.</p> |
