| 摘要 |
A bolted steel staircase is erected by placing side stringers spaced apart and attached to the upper and lower floors. A series of stair pans are placed on brackets, the brackets having been welded to the stringers in the fabrication location. The nuts are then hand-tightened on bolts which are welded to the brackets. A set of flat metal wedges, each having an angled slot, is driven between the vertical bolts and lances on the sides of the stair pans in order to align the stair pans and drive them against the stringers. After the wedges are driven, the nuts are fully tightened.
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