TT4-10型自升塔式起重机(图1),是在毛主席革命路线指引下,在北京市委的领导下,在中央有关部委和兄弟省市的关怀和支持下,为配合北京饭店扩建工程和其它高层建筑的需要而设计制造的。从1972年12月开始,由北京市建工局建筑工程研究所、北京市机械施工公司、一机部建筑机械研究所等五个单位共同设计,由 The TT4-10 self-elevating tower crane (Figure 1) is under the guidance of Chairman Mao’s revolutionary route, under the leadership of the Beijing Municipal Committee, with the care and support of the relevant ministries and commissions of the Central Government and the provinces and cities of the province, in order to cooperate with the expansion project of the Beijing Hotel. Designed and manufactured to meet the needs of other high-rise buildings. Since December 1972, it has been jointly designed by five units including Beijing Institute of Construction Engineering, Beijing Mechanical Construction Company, and the Institute of Construction Machinery.