| 摘要 |
PURPOSE: A ladder assembly for working on a tunnel-type structure is provided to enable the safe and simple installation of a precast tunnel-type structure. CONSTITUTION: A ladder assembly for working on a tunnel-type structure comprises a frame assembly(100) and movement units. The frame assembly is movably arranged along the outer wall surface of first, second, and third precast structures(10,20,30). The frame assembly comprises stairs(101), railings(102), and work baskets(140). The movement units are arranged between the frame assembly and the precast structures and movably support the frame assembly to the external walls of the precast structures.
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