Vertical shaft working surface artesian flow sand layer slurry protecting rotary spraying grouting process
A technology for working faces and vertical shafts, which is applied in shaft equipment, shaft lining, mining equipment, etc., and can solve the problems of piles being unable to be formed by jet spraying, cement slurry washing away, and large water inflow from boreholes. The effect of small area and low energy consumption
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[0019] The process steps of the grout-preserving rotary jet grouting process for the pressurized water flowing sand layer of the vertical shaft working face of the present invention are as follows:
[0020] (1) In the shaft working face under confined water conditions, first implement the single-hole hole forming process steps: in order to prevent the underflow of the quicksand layer and a large amount of water and sand during the hole forming process, a concrete grouting pad is required before construction Construction; after the grouting pad reaches 2-3 days of age, use the air down-the-hole hammer percussion drilling process to drill through the grouting pad according to the designed hole position and angle, install the orifice casing and use CS double-liquid grouting Fix the pipe by way; after the orifice casing has reached the age of 2 days, install the orifice anti-outburst device and the drilling and blowout integrated device to drill into the hole;
[0021] (2) Single-hole...
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