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1991年，西南某单位接到一项钢索桥修建项目，并将这项目包给了本单位的机械修配车间，并确定姚某为本项目工程技术负责人。钢索桥是某县水电局设计的，总长90米，桥面长60米，铺116块水泥预制板，每块板重258公斤。全部重量由两根直径为41毫米（6股19根丝）的钢丝绳悬吊着。两
In 1991, a unit of Southwest received a steel cable bridge construction project, and the project package to the unit’s mechanical repair shop, and to determine Yao as the project engineering and technology leader. Cable bridge is a county hydropower design, a total length of 90 meters, the bridge is 60 meters long, paved 116 cement prefabricated panels, each weighing 258 kg. The total weight is suspended by two wire ropes 41 mm in diameter (6 wires, 19 wires). Two