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桥梁下部结构经常采用单桩单柱的结构形式,这时,上部结构载荷通过墩柱传导,集中作用于承台或系梁以下几个桩柱,各桩柱将所承受的荷载通过桩侧土的摩擦力及桩端岩土的抵抗力传递到岩土中。由于桩数较少,受力集中,负荷较大,桩身一旦发生严重缺陷很难采取补救措施,所以对大口径桥桩的成孔质量和灌注质量要求十分严格。
The lower part of the bridge often adopts the single-column single-column structure. At this moment, the load of the superstructure is transmitted through the pier and concentrates on the following piles of the cap or tie beam. The piles will bear the load through the side of the pile Of the friction and resistance of rock and soil at the end of the pile is transmitted to the soil. Due to the small number of piles, the stress is concentrated and the load is heavy, it is very difficult to take remedial measures in the event of serious defects in the piles. Therefore, the requirements on the quality and perfusion quality of the large-diameter piles are very strict.