| 摘要 |
A tread board assembly of steel stairs is provided to reduce work load, to secure safety of pedestrians, to relieve fatigue, to heighten convenience of assembly, to shorten a period of construction, to improve stiffness and to make lightweight by manufacturing a tread board and a connection plate using a single steel plate. A tread board assembly of steel stairs includes a tread board(100) having a connection plate(200) folded upward and extended from one end and a side plate closing up the side of the tread board, and is connected to stair landing. The tread board includes a nut burying portion(110) formed to fix a nut to secure easiness when fastening a bolt for fixing a side plate and a walk projecting portion, many walk projecting portions(120) formed between the nut burying portions at the same height as the nut burying portion not to give shock or impact to the bottom of the worker's foot or toes, the heel, etc. while walking, and the connection plate includes a coupling portion(240) formed to couple with a fitting portion(140) of the tread board. |
