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对于灌注上部、下部不同标号要求的灌注桩 ,必须合理安排初埋管深度 ,不同阶段竖管底口位置及变更不同标号砼的时机
For perfusion piles with different labels required at the upper and lower part, the depth of the initial tube shall be reasonably arranged, the position of the bottom of the vertical tube at different stages and the timing of changing the different types of concrete