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在一阶段管生产中,对管体混凝土施加环向预应力是一道关键的工序,它会直接影响到管子的抗渗、抗裂性能和保护层是否产生空鼓。一阶段制管工艺施加环向应力是采用水压法,水压值与钢筋应力值之间有着一定的关系,严格控制加压制度就可以满足管体钢筋的预张力和混凝土的预压应力。国外先进国家已采用电子系统控制加压过程,国内少数厂采用自动化电气仪表控制。我厂以
In the first stage of pipe production, the application of hoop prestressing to the pipe concrete is a key process. It will directly affect the impermeability and crack resistance of the pipe and whether the protective layer is empty. In the first stage of the pipe manufacturing process, the hoop stress is applied by hydraulic pressure method. There is a certain relationship between the water pressure value and the stress value of the steel bar. Strictly controlling the pressure system can satisfy the pretension of the steel pipe reinforcement and the precompressive stress of the concrete. Advanced countries in foreign countries have adopted electronic systems to control the pressurization process. A few domestic plants have adopted automatic electrical instrumentation controls. Our factory