| 摘要 |
A prefabricated stairway is provided to extend the applicability of the prefabricated stairway and to be applied to satisfy the various and complicated demand of consumer about the structure and finishing board of the stairs. In a prefabricated stairway, a stair set comprises a stepping plate(21d), a reinforcement plate and a finishing plate(24a) which are united into one body, wherein transverse section has triangle structure. The stepping plate comprises an upper plate portion(216) and a rise portion(213) and forms a support projection(211a). The reinforcement plate comprises a reinforcing bead(221) in an upper plate portion(227), nut seating portion(222a), fall preventive projection, cover portion(225), riser portion(224) and fall preventive projection(224c). |
