The anti -corrosion layer in the cement mortar can be constructed with mechanical spraying, manual compression, trailer or centrifugal pre -production method. If it is necessary to use the prefabricated method as an internal anticorrosive layer, the protection measures should be adopted during the transportation, installation, and backfilling process.
During construction, the primary mix of cement mortar, the quality cooperation ratio of cement and sand is 1: (1-2), the slump of cement mortar is 60-80mm, and the compressive strength of cement mortar should not be less than 30MPa.
The appetizer in the cement mortar construction of the mechanical spray method is lubricated, fine, and uniform, and the effect is better. In the 1930s, the construction of mechanical spray was selected. China has been used in cities such as Shanghai, Qingdao, Dalian and other cities since the 1960s. When the construction of mechanical spraying method is selected, technical modifications can be selected for the elbow, three links, special pipes, and gate valves near the pipe section, and connected with the mechanical spray fabric with a lubricating mutation segment.
