人工挖孔灌注桩与锤击预制桩的效益比较

The Benefit Comparison Between Oust- in- site Pile of Manpower Boring and Driven Precast Pile

结合一个原设计是锤击预制桩基础后改为人工挖孔灌注桩基础的工程，总结变更 设计的成功之处，并对如何合理应用人工挖孔灌注桩基础提高经济效益进行了探讨．

The driven precast pile which has been designed is compared with oust-in-site pile of manpower boring which is introduced now. Some opinions about how to apply the later to the improvement of the project's benefit are presented.