One spray and two stirring: drilling and spraying, lifting and spraying without spraying, so-called empty stirring.
Two sprays and two stirs: spray slurry in the lower part and spray slurry in the upper part.
Two sprays and four stirs: lower the shotcrete, lift it without spraying, and repeat it to complete the four stirs.
Four sprays and four stirs: drill down and spray up, and repeat once to complete the four sprays.
In addition, whether it is four-spraying and four-stirring or two-spraying and four-stirring, when the cement content can not meet the design, slurry should be replenished.
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