直梯 meaning in English

straight ladder
vertical ladder
wall ladder

Columns and other vessels - part 3 : vertical ladders
塔和其它容器.第3部分:直梯
Safety requirements for fixed steel vertical ladders
固定式钢直梯安全技术条件
Safety standard for wood portable vertical ladder
移动式木直梯安全标准
Ships steel vertical ladders
船用钢质直梯
Safety of machinery - permanent means of access to machines and industrial plants - part 4 : fixed ladders
机械安全进入机器和工业设备的固定设施第4部分:固定式直梯