A high-efficiency mixing and alternating dual-hole segmental grouting method
A segmented grouting and alternating technology, which is applied in earth-moving drilling, vertical well equipment, wellbore lining, etc., can solve the problems of inhomogeneous slurry diffusion range, poor grouting effect and low grouting efficiency, and achieve uniform slurry diffusion. Scope, fast grouting efficiency, good grouting effect
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[0033] A high-efficiency mixed alternate double-hole segmented grouting method, comprising the following steps:
[0034] I. First, set the drilling angle, length, position and quantity according to the pre-reinforcement range. According to the design requirements, align the hole positions, and drill holes at both ends of the pre-reinforcement range;
[0035] II. Divide the grouting length of the borehole into several sections according to the geological conditions at the site, and control the retreat distance of each cycle at 2 to 3 meters;
[0036] III. Use a drill bit to open a grouting hole at one end of the pre-reinforcement range. After reaching the drilling depth, withdraw the drilling tool, install a pre-processed No. 1 orifice pipe with a flange in the drill hole, and use quick-setting cement Seal the gap between the No. 1 orifice pipe and the surrounding formation; then replace the drill bit with a diameter smaller than the No. 1 orifice pipe, drill through the No. 1 ...
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