含硬岩层的潜孔锤引孔灌土打入管桩法基础设计研究  

Research on the Foundation Design of the Drill Hammer Pilot Hole Method with Hard Rock Stratum

作　　者：何余钧 林惠庭 何建亮 唐俊 周文超 HE Yujun;LIN Huiting;HE Jianiang;TANG Jun;ZHOU Wenchao(Changyu(Zhuhai)International Architectural Design Co.,Ltd.Zhuhai 519100,China;Zhuhai Doumen District Construc‐tion Project Quality Monitoring Station Zhuhai 519125,China;Zhuhai Jianan Group Co.,Ltd.Zhuhai 519000,China)

机构地区：[1]长宇(珠海)国际建筑设计有限公司,广东珠海519100 [2]珠海市斗门区建设工程质量监督检测站,广东珠海519125 [3]珠海市建安集团有限公司,广东珠海519000

出　　处：《广东土木与建筑》2023年第10期51-55,共5页Guangdong Architecture Civil Engineering

摘　　要：对于“上软下硬,软硬突变”的地层,PHC管桩沉桩困难,破损多且嵌岩深度不足。采用潜孔锤引孔灌土打入管桩法能有效的保证PHC管桩穿透含硬岩层,达到入岩深度要求。针对没有专门的单桩竖向抗压承载力特征值Ra计算公式,对比相比规范的4种相近Ra计算公式,并结合静载试验对Ra计算结果进行对比分析。结果表明按此工法施工的PHC500管桩与正常液压锤击法管桩的Ra均能达到2 000 kN的设计要求,Ra按《建筑桩基技术规范:JGJ 94—2008》公式计算,并且调整部分参数取值,能达到合理的计算结果。For the stratum with soft upper and hard bottom and abrupt change of soft and hard,PHC pipe pile is difficult to drive,damaged more and the depth of rock socketing is insufficient.The method of drilling pipe pile with drill hammer can effectively ensure that PHC pipe pile penetrates hard rock stratum and reaches the depth requirement.As there is no special Ra calculation formula for the character‐istic value of vertical compressive capacity of single pile,four similar Ra calculation formulas of the standard are compared,and the Ra cal‐culation results are compared and analyzed combined with static load test.The results show that the Ra of PHC500 pipe pile constructed by this construction method and the normal hydraulic hammer method can both reach the design requirements of 2000 kN.The Ra can be calcu‐lated according to the formula of JGJ 94—2008"Technical Specification for Building Pile Foundation",and the reasonable calculation results can be achieved by adjusting the values of some parameters.

关 键 词：含硬岩层 潜孔锤 引孔 入岩深度 竖向抗压承载力 

分 类 号：TU473.12[建筑科学—结构工程]