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后张构件管道压浆是较重要的工艺。在预留管道内压注水泥浆的作用,一方面是要保护预应力钢筋免遭锈蚀;另一方面是使预应力钢筋获得握裹力,以便与梁体混凝土结合,共同受力。因此,对于压注的水泥浆除了有强度要求外,还应均匀密实,充满管道。关于压注水泥浆的次数(即是一次还是二次),到目前为止,还有不同的见解。一、国内有关规定据铁道部《后张法预应力钢筋混凝土铁路桥梁技术条件》规定:“管道压浆分
Post-tensioned pipe grouting is an important process. The role of injection of cement slurry in reserved pipelines is to protect the prestressed steel bars from corrosion; on the other hand, the prestressed steel bars are given a gripping force so that they can be combined with the beam body concrete to exert joint forces. Therefore, in addition to the strength requirements, the pressure-injected cement slurry should be evenly packed and filled with pipes. Regarding the number of injections of cement slurry (ie, once or twice), there are different opinions so far. I. Domestic regulations According to the “Technical Conditions for Post-tensioned Prestressed Reinforced Concrete Railway Bridges” issued by the Ministry of Railways: "Pipeline grouting