| 摘要 |
A prefabricated stairway is provided to broaden the applicability of the prefabricated stairway and to be applied to meet the various and complicated demands of consumer about the structure and finishing board of the stairs. In a prefabricated stairway, a stair set comprises a stepping plate(21b), a reinforcement plate(22b) and a finishing plate(24b) which are united into one body, wherein transverse section has triangle structure. A stepping plate comprise a fall preventive projection(221) preventing the secession of the mortar and injection ports(212) injecting the mortar. A reinforcement plate comprise upper plate portion in which the reinforcement bead(221) which prevents to below droop is formed over two course net, nut seating portion(222c) in which the combine nut(14a) fixed stairs set mounted on bridgeboard, injection port(226) applying the mortar to the inside of the reinforcement plate and the drain hole ejecting the water generated among construction or rainwater flowed inside of the reinforcement plate. |
