塔式起重机（以下简称塔机）是建筑施工中必不可少的施工机械之一。因塔机自身的特点及特殊的工作方式．它的选用与其他施工机械有很大的不同。根据所确定的在施工程的结构和建造方式的不周选用不周型号的塔机。是选用塔机的主是原则。此外．运输道路、上质情况、地下结构等周 Tower crane (hereinafter referred to as tower crane) is one of the essential construction machinery in construction. Because of its own characteristics and special tower crane working methods. Its selection and other construction machinery are very different. According to the determined construction process in the construction and construction of the ill-advised selection of ill-type tower crane. Is the main choice of tower crane principle. In addition. Transport roads, the quality of the situation, underground structure and other weeks