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1概述随着国家现代化建设的飞速发展，高层超高层建筑、桥梁、港口、电力和化工建设工程等大型建筑施工越来越多，这些建筑工程对塔式起重机提出了新的要求。国家“九五”科技攻关项目“大型塔式起重机及其关键配套设备”提出要在“九五”期间研制出QTZ315大型塔式起重机，填补
1 Overview With the rapid development of national modernization, more and more large-scale buildings such as high-rise super-tall buildings, bridges, ports, electric power and chemical construction projects are being constructed. These construction projects have put forward new requirements for tower cranes. National “Ninth Five-Year” scientific and technological project “large tower crane and its key ancillary equipment” proposed in the “Ninth Five-Year” period developed QTZ315 large tower crane to fill