天津高新区117大厦超长桩钻孔施工技术

Construction Technology of Borehole for Super-long Pile of 117 Mansion in Tianjin

天津高新区中央商务区117大厦桩基设计为超长桩,质量要求高,施工难度大。施工过程中通过对孔口护筒埋设、泥浆质量、孔内液面高度、孔位偏差、钻孔垂直度和孔底沉渣的有效控制,不仅钻孔质量达到设计要求,而且钻孔效率高,成本较低。介绍了117大厦超长钻孔灌注桩工程的施工情况,其经验可供类似工程借鉴。

Super-long pile was designed for the pile foundation of 117 mansion in the central business district of high-tech zone in Tianjin with high quality requirement and construction difficulties. The paper introduced the construction of super- long bored grouting pile, by the effective control on embedment of steel protective pipe at borehole entrance, mud quality, hole position deviation, borehole verticality and sediment on bottom, borehole quality reached the design requirements with high drilling efficiency and lower cost.