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全苏建筑与筑路机械科学研究所与建筑机械厂共同研制了一种建筑用带转塔的新型全迥转自行塔式超重机-504,由建筑机械厂制造的试验样机巳通过验收试验并由国家验收委员会推荐投入成批生产。1980年建筑机械厂制造了第一批这种起重机。-504塔机适用于环境温度±40℃及属于Ⅰ至Ⅲ类风区的地区。该机是为建设住宅、办公大楼和工业厂房设施时建筑安装工作的机械化而设计的,也适用于建造高达22层的单幢用于文化生活的大楼。
All Su Construction and Road Machinery Research Institute and the construction machinery factory jointly developed a building with a revolving tower with a new type of completely free to turn tower crane - 504, the construction machinery factory test prototype has passed the acceptance test Recommended by the national acceptance commission into mass production. The 1980 construction machinery factory built the first of these cranes. -504 tower crane for ambient temperature ± 40 ℃ and belongs to Ⅰ to Ⅲ wind area. This machine is designed for the mechanization of building and installation work in the construction of residential, office buildings and industrial plant facilities. It is also suitable for building buildings of up to 22 storeys for cultural life.