我单位用简易方法制作了一套双砌工作台,顺利完成了一座50米高的砖烟囱砌筑任务。图1为简易双砌工作台。它由上下井架、套架、外砌工作台、堆料平台、砌内衬工作台和吊笼组成。吊笼设有安全装置,供施工人员上下和材料垂直运输使用。它通过导索和井架入口处的导轨升降;井架 My unit made a set of double brick work benches with a simple method and successfully completed a 50-meter-high brick chimney masonry task. Figure 1 shows a simple double-lay bench. It consists of upper and lower derricks, jackets, external bricklaying workbenches, stockpiling platforms, bricklaying lining workbenches and hanging cages. The cage is equipped with safety devices for the construction personnel to use up and down and the material is transported vertically. It moves up and down through guide rails and guide rails at the entrance of the derrick; the derrick