STEPPED FLOOR UNIT, STEPPED FLOOR STRUCTURE AND CONSTRUCTION METHOD OF STEPPED FLOOR

摘要

PROBLEM TO BE SOLVED: To increase the safety and efficiency of welding work or others and improve the quality of a steel stepped floor in the stands of a stadium or the like. SOLUTION: Treadboards 1, rises 4,... continue stepwise, and make a stepped floor substrate 10 having connecting pieces 6 at the edge 2 of the lowermost treadboard 1. A reinforcement 12 is welded to the reverse 1a of each of the treadboards 1. Reinforcement plates 19, 21 and 28 are fixed along the reverse of the stepped floor substrate 10. By mounting an adjusting bolt 35 turned down to the base end 3 of the uppermost treadboard 1, the stepped floor unit 38 is formed. The stepped floor unit 38 is installed on a receiving beam 40 stepwise in a stepped floor construction position. After the height is adjusted by an adjusting bolt 35, the receiving beam 40 and each stepped floor unit 38 are fixed through a fixing material 42. Adjacent stepped floor units 38 are built into a stepped floor structure by joining the joining pieces 6 of upper stepped floor units 38 and the upper ends of the rises 4 of lower stepped floor units 38.