北京市建筑工程研究所为解决地面抹灰工程工效低、质量差、劳动强度高的问题,在分析国内外有关经验基础上,试制了69—1型地面抹光机(图19)。这种抹光机适用于一般厂房和办公楼等建筑工程的水泥砂浆、混凝土地面讯路面以及预制混凝土楼板、屋面板表面的抹光压平作业。 In order to solve the problem of low work efficiency, poor quality, and high labor intensity of the surface plastering project, the Beijing Institute of Building Engineering has trial-produced a Type 69-1 floor trowel on the basis of analysis of relevant experience at home and abroad (Figure 19). This trowel is suitable for general-plant and office buildings and other construction projects of cement mortar, concrete ground surface and the precast concrete floor, roof surface lightening work.