ANTIFREEZING STRUCTURE OF STEEL FLOOR SLAB BRIDGE

摘要

PROBLEM TO BE SOLVED: To provide an antifreezing structure of a steel floor slab bridge capable of efficiently preventing freezing or fallen snow in a simple and low cost constitution. SOLUTION: An asphalt pavement 20 formed of two layers constituted of a binder course and a surface course 22 in the upper face of a deck plate 11 of a steel floor slab girder 1 is laid. A far-infrared ray electric heating sheet 31 sandwiched between thin membrane sheet-like heaters in between a special snow-thawing sheets mixed with far-infrared ray elements is housed and fixed in a housing recess 21A formed on the upper face of the binder course 21 and intermittently interposed between the binder course 21 and the surface course 22. A waterproof sheet 32 is interposed to cover the whole area of the binder course 21 including the far-infrared ray electric heating sheet 31. In the surface course 22, far-infrared ray elements are mixed in the asphalt.