预制桩施工时脱节上浮与处理方法研究
摘要:介绍了预制桩沉桩过程中对周围环境的影响,结合工程实例分析了多节配备的预制桩部分上浮对工程产生的影响。静载检测由于抽检比例有限,可能不能完全反映工程桩总体承载特性。首先用低应变方法对工程桩进行一定比例的抽检,对发现的Ⅲ类桩进行了高应变和静载验证检测,证实了低应变的结论。针对抽检发现的Ⅲ类桩进行原因分析,指出该工程的预制桩存在脱节,上节桩上浮现象,并对上浮桩进行了复压处理。复压后采用静载方法进行验证检测,检测结果满足原来的设计要求。对建筑物进行了沉降观测,测得最大累计沉降量6.54 mm,且沉降均匀稳定。
Abstract:In this paper,the influence of pile construction on the surrounding environment is introduced,combined with an engineering example,the influence of the section of precast piles with multiple sections on the engineering is analyzed.Due to the limited sampling rate,the static load test may not fully reflect the overall bearing capacity of the pile.In the first part,the low strain method is used to carry out a certain proportion of the sampling to the engineering piles,the high strain and the static load test results which proves the conclusion of the low strain.According to the analysis of the reasons for the Ⅲ piles found in the sampling,it is pointed out that there is a gap between the precast piles in the project.After repressing,the static load method is used to verify the test results,and the results meet the original design requirements.Settlement observation of buildings shows that:the maximum cumulative settlement is 6.54 mm,and the settlement is uniform and stable.
中文标题：
预制桩施工时脱节上浮与处理方法研究
Study on Disjoint Floating in Prefabricated Piles Construction and Disposal Measures
作者：
郑贺,张旭
Zheng He,Zhang Xu
作者简介:郑贺,男,1984年生,江苏徐州人,工学硕士,工程师。主要从事地基基础检测。E-mail:215876330@qq.com
通讯地址：
徐州市建设工程检测中心, 江苏徐州 221000
XuzhouConstructionEngineeringTestingCenter,Xuzhou221000,Jiangsu,China
中图分类号:TU473.1
doi:10.3969/j.issn.1007-2993.2016.05.010
出版物：岩土工程技术
收稿日期:2016-05-23
关键词:预制实心方桩,挤土效应,上浮,复压,高应变,低应变,Q-S曲线
Key words:prefabricated solid square pile,soil compaction effect,floating,repressing,high strain,low strain,Q-S curve
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