| 摘要 |
The present invention relates to a ladder for a manhole and a manufacturing method thereof. More specifically, an insertion part to be inserted into an embedded fixation part, embedded in the manhole, and a ladder comprising a foot plate part on which a worker steps are independently manufactured. Then, the insertion part and the ladder are integrated by an injection process instead of an assembling process. Accordingly, the number of work processes is reduced because the assembling process is omitted, productivity is increased, and production costs can be reduced. |
