高层建筑静压预应力管桩施工初探

About static pressing prestressed pipe pile construction technology in high-rise buildings

对高层桩基采用静力压桩法,依据地质状况、场地条件、最大压桩力、单桩极限承载力、入土深度、桩身强度、打桩顺序、用电量平衡、引孔压桩法等,并结合当地经验综合施工。静载效果分析极限承载力比最终压桩力提高了44%～79%。与钻孔灌注桩经济对比,大吨位管桩节省造价14%。

The method of static pressing pile in high-rise building is related to geological condition, site condition, maximum pressing force, ultimate bearing capacity of single pile, buried depth, strength of pile, piling sequence, energy balance, method of pressing pile with pre-augering and local experience. According to the static loading test, the ultimate bearing capacity of single pile is increased by 44%-79% than the final pressing pile force. Compared to the bored pile, large tonnage prestressed pipe piles reduces investment about 14%.