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珠海某超高层建筑有四层地下室,采用抗拔桩抵御水浮力,由于基坑支护采用内支撑的形式,承台以上有18m的空桩,桩身采用先预埋钢管,开挖土方破除空桩后伸入钢绞线,再对钢管进行注浆后张拉预应力钢绞线。桩身需满足承载力及裂缝的要求,以及按检测荷载进行复核;预应力锚头与钢管内注浆体之间需进行局压验算,钢管壁与注浆体间需进行摩擦力验算。
Zhuhai, a super high-rise building has four basements, the use of anti-pull pile to withstand buoyancy, due to the support of the foundation pit in the form of internal support, cap above the 18m empty piles, pile embedded steel pipe first, excavation of earth to get rid of After the empty pile into the strand, and then after the steel pipe grouting prestressed strand. Pile body to meet the requirements of bearing capacity and cracks, and according to the test load review; prestressed anchor head and pipe grouting between the need to check the pressure between the pipe wall and grouting need to check the friction between the body.