Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Combined drilling method for aeolian sand deeply-covered tuff stratum end bearing pile
The invention discloses a combined drilling method for an aeolian sand deeply-covered tuff stratum end bearing pile. The combined drilling method comprises the steps of drilling machine placement, covering layer drilling and drilling in a rock stratum. As for the construction step of drilling in the rock stratum, drilling should be conducted at an interface of soft and hard rock at a low speed toprevent a pile hole from collapsing and inclining, and the small stroke (1.5 to 2 m) is used for impacting; in the drilling process, the change of a water head difference in a retaining cylinder is observed at any moment, and the horizontal plane of mud in the hole shall be more than 2 m higher but 0.3 m lower than the top face of the retaining cylinder to prevent the hole wall from collapsing andthe mud from overflowing; and when a water head is insufficient, the mud should be supplemented in time, and when drilling is stopped due to slag discharging, slag extraction or other reasons, attention should be paid to keeping the water head in the hole to prevent drill burying caused by hole collapse. The technical problems that in an aeolian sand stratum area, thick sand layers and gravel-cobble exist in strata, stability of foundations is poor, consequently a conventional large-diameter cast-in-situ bored pile scheme is adopted for construction, and boring for a pile foundation and highpouring quality and safety risks are prone to being caused are solved.
本发明申请公开了一种风积沙深覆盖凝灰岩地层端承桩的组合钻进方法，包括钻机就位、覆盖层钻进和岩层内钻进，其中岩层内钻进施工步骤包括，在软硬岩石交界面处应慢速钻进，防止桩孔坍塌、倾斜，使用小冲程(1.5‑2m)冲击；钻进过程中随时观察护筒内的水头差变化，孔内泥浆水平面须高出2m以上，但比护筒顶面低0.3m，防止孔壁坍塌及泥浆溢出；水头不足时应及时补浆，在排渣、提渣或其他原因停钻时，应注意保持孔内水头以防塌孔造成埋钻。本发明申请解决了由于风积沙地层区域，地层中均存在较厚的砂层、卵砾石，地基自身稳定性较差，导致采用常规的大直径钻孔灌注桩方案进行施工，容易造成桩基成孔、浇筑质量和安全风险较高的技术问题。
Combined drilling method for aeolian sand deeply-covered tuff stratum end bearing pile
The invention discloses a combined drilling method for an aeolian sand deeply-covered tuff stratum end bearing pile. The combined drilling method comprises the steps of drilling machine placement, covering layer drilling and drilling in a rock stratum. As for the construction step of drilling in the rock stratum, drilling should be conducted at an interface of soft and hard rock at a low speed toprevent a pile hole from collapsing and inclining, and the small stroke (1.5 to 2 m) is used for impacting; in the drilling process, the change of a water head difference in a retaining cylinder is observed at any moment, and the horizontal plane of mud in the hole shall be more than 2 m higher but 0.3 m lower than the top face of the retaining cylinder to prevent the hole wall from collapsing andthe mud from overflowing; and when a water head is insufficient, the mud should be supplemented in time, and when drilling is stopped due to slag discharging, slag extraction or other reasons, attention should be paid to keeping the water head in the hole to prevent drill burying caused by hole collapse. The technical problems that in an aeolian sand stratum area, thick sand layers and gravel-cobble exist in strata, stability of foundations is poor, consequently a conventional large-diameter cast-in-situ bored pile scheme is adopted for construction, and boring for a pile foundation and highpouring quality and safety risks are prone to being caused are solved.
本发明申请公开了一种风积沙深覆盖凝灰岩地层端承桩的组合钻进方法，包括钻机就位、覆盖层钻进和岩层内钻进，其中岩层内钻进施工步骤包括，在软硬岩石交界面处应慢速钻进，防止桩孔坍塌、倾斜，使用小冲程(1.5‑2m)冲击；钻进过程中随时观察护筒内的水头差变化，孔内泥浆水平面须高出2m以上，但比护筒顶面低0.3m，防止孔壁坍塌及泥浆溢出；水头不足时应及时补浆，在排渣、提渣或其他原因停钻时，应注意保持孔内水头以防塌孔造成埋钻。本发明申请解决了由于风积沙地层区域，地层中均存在较厚的砂层、卵砾石，地基自身稳定性较差，导致采用常规的大直径钻孔灌注桩方案进行施工，容易造成桩基成孔、浇筑质量和安全风险较高的技术问题。
Combined drilling method for aeolian sand deeply-covered tuff stratum end bearing pile
风积沙深覆盖凝灰岩地层端承桩的组合钻进方法
ZHANG ZHENG (Autor:in) / ZHUANG CHAOHUI (Autor:in) / PENG YUAN (Autor:in) / TANG CHENGLONG (Autor:in) / YU ZHAOHUI (Autor:in)
06.11.2020
Patent
Elektronische Ressource
Chinesisch
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