在工业烟囱的施工中,垂直运输占有重要的地位。解放后采用了金属竖井架,以卷扬机提升材料,比以前所用的木制井架大大地前进了一步。但是这种方法还存在许多缺点,如当料斗提升到工作台上时,须由一个工人站在工作台上,将罐龙与罐斗间的插销取下,将料斗翻倒,高空作业,很不安全;卷扬机停 In the construction of industrial chimneys, vertical transportation occupies an important position. After the liberation, a metal shaft derrick was used to lift the material with a hoist, making it a step further than the wooden derrick previously used. However, this method still has many shortcomings. For example, when the hopper is lifted onto the workbench, a worker must stand on the workbench, remove the pin between the tank dragon and the tank, turn the hopper over, and work at heights. Unsafe; winch parked