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Full-hydraulic drilling rig construction method for drilling large-diameter piles through holes in hard rock formations
2019/12/27
Mechanical rotary drilling rig construction method for drilling through cast-in-situ piles to pass through hard plastic-shaped cohesive soil layer
2019/12/27
Full hydraulic drilling rig construction method for crossing ultra-thick gravel soil layer in hole formation of super-long and large-diameter piles
2019/12/27
