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本文阐述了正循环钻进、气举反循环清孔工艺的施工原理、参数选择以及施工技术控制。通过两种施工工艺的结合运用,不仅有效解决了桩孔孔壁的稳定性问题,防止孔壁坍塌,减少泥皮厚度;还能大幅度地缩短清孔时间,降低孔底沉渣厚度,提高单桩承载力,减少泥浆排放量。从工期、质量、经济、环保等角度来看,正循环钻进、气举反循环清孔施工工艺具有明显优势,有较强的推广应用价值。
This article expounds the construction principle, parameter selection and construction technology control of positive circulation drilling and gas lift reverse circulation cleaning. Through the combination of the two construction techniques, not only the stability of the hole wall of the pile hole is effectively solved, the collapse of the hole wall is prevented, the thickness of the mud skin is also reduced, the hole clearing time can be greatly shortened, the thickness of the slag bottom can be reduced, Pile bearing capacity to reduce mud emissions. From the construction period, quality, economy, environmental protection and other point of view, is the cycle of drilling, gas lift reverse circulation hole cleaning process has obvious advantages, there is a strong value of the promotion.