| 摘要 |
There are provided inner stairs for a building which include a main landing (1) formed of a precast concrete plate and supported by two props (4) buried in a wall portion and exclusive jig-supports (5) removable therefrom prior to placing of concrete in a wall portion, an intermediate landing (2) formed and supported as well as the main landing (1) at a intermediate position between floors, and stair units (3) having wall-side and central strings (32, 34), treads (362) fixed in these strings and handrails provided with balusters, a bottom rail and the like. By using the inner stairs, an efficiency of works in a construction of the building can be improved by making removal of constructing material minimum, and a reduced term of construction and remarkable low cost thereof can be achieved by omitting the works of the construction and restraining an amount of material.
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