预应力混凝土结构具有性能优良和节约钢材、木料等优点。在工程结构中采用预应力混凝土,用1吨冷拔低碳钢丝即可代替2吨普通钢筋;用1吨高强钢材即可代替3～4吨普通钢筋;采用预应力混凝土轨枕、电杆、每立方米可代替红松1.3立米和电杆1.5立方米,且延长使用年限几倍;若用于压力管道,可节约钢铁80～90%。近年来我国预应力混凝土应用范围和推 Prestressed concrete structures have excellent performance and save steel, wood and other advantages. Prestressed concrete is adopted in the engineering structure, and 1 ton of cold-drawn low-carbon steel wire can be used instead of 2 ton of ordinary steel; 1 ton of high-strength steel can be used instead of 3 to 4 ton of ordinary steel; prestressed concrete sleepers, poles, and Cubic meters can replace 1.3 cubic meters of Pinus koraiensis and 1.5 cubic meters of poles, and extend the service life by several times. If used in pressure pipelines, it can save 80 to 90% of steel. In recent years, the scope and push of prestressed concrete in China