Carrier ladder and related installation method

The invention relates to a carrier ladder and a related installation method. The carrier ladder includes a step well having a lower floor (16), an upper floor (18), an outer lateral partition wall and an inner lateral partition wall, at least one step module (8) including a plurality of steps (20) each extending from the inner lateral partition wall to the outer lateral partition wall, and one or more step modules (8) extending from the lower floor (16) to the upper floor (18). The step (4) comprises a structural module (10) extending between the outer lateral partition wall and the inner lateral partition wall in a central region of the step well (6), the structural module (10) is independent of the outer lateral partition wall and the inner lateral partition wall, the structural module (10) comprises a plurality of step retaining members (22), and at least three steps (20) of the at least one step module (8) are each supported by one of the step retaining members (22). 本发明涉及一种载具阶梯及相关安装方法。载具阶梯包括：阶梯井，其具有下底板(1