本文首次提出了用真空—注浆法制作三阶段管保护层的工艺原理,并着重介绍了用该法制作φ500mm管保护层的关键工艺参数、专用及其配套设备的工作原理。通过与现有其它工艺的比较,作者指出:新的保护层制作方法具有无飞灰、噪声及能耗低、原料省、投资少等优点。 This paper first proposed the process principle of making three-stage tube protective layer by vacuum-grouting method, and emphatically introduced the key process parameters, special purpose and supporting equipment working principle for making φ500mm tube protective layer by this method. By comparing with other existing technologies, the authors pointed out that the new protective layer production method has the advantages of no fly ash, low noise, low energy consumption, raw material saving, and low investment.