The method of balancing the pressure between each caisson was used for steel casing installation in reconstruction project/Then the hole was filled in to give the steel casing greater stability.Cross hammer was used for piercing through the floor at the bottom of caissons.The mix ratio of slurry and the method of cleaning hole and draining residue were successfully used in the construction of rock-socketed pile embedded through the bottom plate of caisson.This new construction technique for rock-socketed pile embedded through the bottom plate of caisson has important practical and engineering significance.%改建工程采用平衡仓间压力挖石清障安放钢护筒,之后回填固定护筒,经过试验论证采用十字冲击锤在护筒内冲砸沉箱底板,穿越成孔.调配泥浆输渣、清孔,使穿越沉箱底板成孔嵌岩桩施工获得成功.这种穿越沉箱底板成孔嵌岩桩施工新技术具有较重要的现实意义.
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