求翻译：振捣插筋钻孔压灌桩与钻孔压灌桩的差别在于：大孔段震捣可将部分砼骨料振入孔壁或孔底导致大幅度调动地层的侧磨阻和端阻并提高桩身砼密实度；突破了在已灌注砼的桩孔中插筋的关键工序障碍。其综合经济技术优势：是什么意思？

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