旋挖钻机在厚砂卵石层及膨胀性粘土层钻孔灌注桩中的应用
선알찬궤재후사란석층급팽창성점토층찬공관주장중적응용
Application of Rotary Drilling Rig in The Deep Bored Pile in The Thick Sandy Pebble Layer and Expansive Clay Strata
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