某建筑物沉降突变原因分析及对预制管桩工程相关问题的反思  

Cause Analysis of Sudden Change of Settlement of a Building and Reflection on Relevant Problems of Prefabricated Pipe Pile Engineering

作　　者：王伟 黄良机 WANG Wei;HUANG Liangji(Urban Planning&Construction Bureau of the Guangdong-Macao in-Depth Cooperation Zone in Hengqin,Zhuhai Guangdong 519015,China;The Construction Quality Supervision and Inspection Station of Zhuhai,Zhuhai Guangdong 519015,China)

机构地区：[1]横琴粤澳深度合作区城市规划和建设局,广东珠海519015 [2]珠海市建设工程质量监测站,广东珠海519015

出　　处：《工程质量》2024年第5期59-64,共6页Construction Quality

摘　　要：通过对某建筑物沉降突变的后果呈现和原因分析,印证了基桩上浮的可能性和危害性。为有效检出上浮桩,对抽样检测的可靠度进行了理论分析,计算出在各种情况下的漏检概率。另外还以本工程为例讨论了低应变法的有效检测深度问题,从而对现行规范中的检测方法和抽检数量提出了修订建议。最后,为减小基桩上浮现象,对接桩质量、收锤标准、挤土效应等问题提出了相应的质量控制对策。Through analyzing the consequences and causes of sudden change of settlement of a building,the possibility and harmfulness of the foundation pile floating are confirmed.In order to detect floating piles effectively,the reliability of sampling detection is analyzed theoretically,and the probability of missing detection under various conditions is calculated.In addition,the effective detection depth of low strain method is discussed by taking this project as an example,so as to put forward some suggestions for revising the detection method and sampling quantity in the current standard.Finally,in order to reduce the floating phenomenon of foundation pile,the corresponding quality control measures are put forward for the problems such as joint quality,the standard of termination hammering and the effect of soil compaction.

关 键 词：建筑物沉降 管桩 桩上浮 抽样检测 接桩质量 收锤标准 挤土效应 

分 类 号：TU478[建筑科学—结构工程] TU472[建筑科学—土工工程]