| 浙江某高层预应力管桩偏位和上浮处理实例分析 |
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| 引用本文： | 张忠苗,张乾青,贺静漪,俞峰,刘俊伟.浙江某高层预应力管桩偏位和上浮处理实例分析[J].岩土力学,2010,31(9):2919-2924. |
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| 作者姓名： | 张忠苗 张乾青 贺静漪 俞峰 刘俊伟 |
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| 作者单位： | 1. 浙江大学,软弱土与环境土工教育部重点实验室,杭州310058;浙江大学,岩土工程研究所,杭州310058
2. 浙江大学,软弱土与环境土工教育部重点实验室,杭州310058;浙江大学,岩土工程研究所,杭州310058;浙江理工大学,建筑工程学院,杭州310018 |
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| 摘 要： | 结合工程实例分析了预应力管桩产生偏位的原因，介绍了偏位预应力管桩的处理方法。首先测量每根管桩的桩顶偏位和上浮情况，然后对所有管桩进行低应变动测，确定桩身损伤情况及缺陷部位，最后根据管桩偏位和损伤情况采取有针对性的处理措施。工程中对上浮桩采用复打复压处理；对严重偏位且断裂桩进行补预应力管桩处理；对偏位超过规范值但桩身质量完好的桩进行纠偏扶正处理；对偏位较大且桩身有损伤的桩进行先纠偏扶正，并在管桩内芯放钢筋笼灌芯加固处理；对群桩大面积偏位损伤部分由于处理后承载力达不到设计要求需要采用补桩处理。建筑物经上述处理后的实测最大沉降仅为 9 mm，且沉降较为均匀。
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| 关 键 词： | 预应力管桩 偏位 上浮 纠偏 灌芯 沉降 |
| 收稿时间： | 2009-02-23 |
Example analysis of sloping and floating upward prestressed pipe pile with treatment of a high-rise building in Zhejiang province |
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| ZHANG Zhong-miao,ZHANG Qian-qing,HE Jing-yi,YU Feng,LIU Jun-wei.Example analysis of sloping and floating upward prestressed pipe pile with treatment of a high-rise building in Zhejiang province[J].Rock and Soil Mechanics,2010,31(9):2919-2924. |
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| Authors: | ZHANG Zhong-miao ZHANG Qian-qing HE Jing-yi YU Feng LIU Jun-wei |
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| Institution: | 1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China; 2. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 3. School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou 310018, China |
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| Abstract: | Based on an engineering example, the reason of the sloping prestressed pipe pile (PPP) and the treatment method for the sloping PPP were given. First of all, the sloping condition of each pile should be made clearly, then the damaged position of every pile is clarified with low strain dynamic test; and at last the pertinence treatment measures are brought forward. It can be concluded that for the piles with pile shafts floating upward, they can be re-pressed; for the piles with serious pile top slopes and rupture of the pile shafts, they must be replaced by bored piles; for the piles with smaller pile top slopes and soundness of the pile shafts, they can be directly used after rectification and righting; for the piles with bigger pile top slopes and defect of the pile shafts, the first step is rectification and righting; and then strengthening the pile shafts by placing reinforcement cage and pouring concrete in the cores of the piles; and for the treated piles with lower bearing capacity, the bearing capacity of the bearing platform should be strengthened by adding bored piles. The measured settlement of building is small and uniform, and the maximum settlement is only 9 mm. |
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| Keywords: | prestressed pipe pile slope floating upward rectification pour concrete in core of pile settlement |
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