深厚松散填石层咬合桩组合成桩技术

Combined Pile-forming Technology of the Secant Piles in Deep and Loose Rock-fill Layer

针对深厚松散填石层基坑支护咬合桩施工过程中出现旋挖钻进困难、漏浆严重、孔内坍塌等问题,根据地层分布情况,提出了钻、冲、填综合施工工艺,采用1根钢筋混凝土桩(B桩)和2根素混凝土桩(A桩)共3根桩同时灌注混凝土成桩的组合式施工技术,取得了显著成效。

According to the stratum distribution,a comprehensive construction technology including drilling,flushing and filling technology is put forward in view of the problems in construction of the secant piles in deep and loose rock-fill layer,such as the difficulty of rotary drilling,serious leakage of slurry,hole collapse and so on.The combined construction technology of one reinforced concrete pile(B pile)and two plain concrete piles(A pile)with three piles cast in concrete at the same time achieves remarkable results.