FIRE RESISTANT STRUCTURE OF BUILDING WALL

PROBLEM TO BE SOLVED: To facilitate the assembling work of a fire resistant structure to a steel column at site without increasing the wall thickness even when an outer wall material is positioned close to the steel column.SOLUTION: A coating layer 16 is formed by attaching a common fire resistive covering material 7 to a steel column 1 on the outer surface sides of both flanges 12 and one side of a web 14. A fire-resistant surface material 2 is disposed at the outer face side of the web 14 to integrally cover plural steel columns 1. The fire resistive covering material 7 has a fiber base material which contains at least 35-45 mass% of silicon dioxide, 15-32 mass% of calcium oxide and 10-22 mass% of aluminum oxide. A space between flange ends 121 of the steel column 1 and the fire-resistant surface material 2 is filled with the fire resistive covering material 7 with a thickness of 20-35% of the thickness of the coating layer 16.