| 摘要 |
PROBLEM TO BE SOLVED: To construct an overhanging bridge using corrugated steel plate webs, by attaching reinforcing steel members to the upper and lower edges of a corrugated steel plate and protruding it from an existing girder and partly bending the reinforcing steel member for adjustment thereof so that the vertical deflection of the front end of the corrugated steel plate coincides with the planed value. SOLUTION: When such a larger deflection than an expected deflection that the front end of a corrugated steel plate hangs down during the overhanging execution, is brought about, it is necessary to make shorter the upper side length of the corrugated steel plate than the lower side length. A hydraulic jack 23 is set between frames holding the right end girder member of the upper reinforcing frame 20a and stretched by supporting the reactive force at the right end of the frame and the compressive force is provided in the longitudinal direction or the girder. Since the corrugated steel plate is not smoothly deformed by the resistance against the buckling of the reinforcing steel member 12 connected to the upper end of the girder member, benders are put in steel members 12 between crests of the corrugated steel member or between valleys thereof and the jack is actuated to partly bend and deform the steel members 12 and adjust them. The upper and lower ends of the corrugated steel plates are embedded in cast-in-place concrete to form a bridge girder with a box-shaped section. |
