4　 8 0年代80年代是我国塔机行业深化发展的十年。由于改革开放 ,城市建设规模扩大 ,建筑任务繁重 ,对塔机需求倍增。因而塔机年产量大幅度上扬 ,除个别年份外 ,历年产量均接近或超越千台 ,见表 5。表 5　我国 80年代塔机产量表 (台 )　年度 19811982 1983 19841985 198619871 1980s China’s tower crane industry to deepen the development of the decade. Due to the reform and opening up, the scale of urban construction expanded, heavy construction tasks, demand for tower crane doubled. As a result, the annual output of tower cranes has risen sharply. Except for a few years, the annual output of the tower cranes has approached or exceeded 1,000 units in the past few years, as shown in Table 5. Table 5 China’s 80 tower crane production table (Taiwan) Year 19811982 1983 19841985 198619871