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我厂从1976年批量生产三阶段混凝土压力管以来,曾多方面探索保护层的制作方法,先后采用过辊射喷浆、手工涂抹等制作工艺。由于各种因素的影响,制作的保护层都不同程度地存
Since our factory mass-produced three-stage concrete pressure pipes in 1976, we have explored the production methods of protective layers in many ways. We have used roll-shotcreting and manual painting techniques. Due to various factors, the protective layers produced are stored in different degrees.