后插钢筋笼灌注桩后压浆工艺应用与研究

发布时间：2018-03-24 07:14

本文选题：后压浆　切入点：灌注桩　出处：《中国地质大学(北京)》2017年硕士论文

【摘要】：后压浆工艺可以提高桩基的单桩承载力及减小桩顶沉降,削减成本、节省工期,经济效益十分可观。后压浆工艺和后插钢筋笼工艺“强强联合”,作用效果更佳,应用前景十分广阔。但是,人们对于后压浆工艺的作用原理及压浆效果认识不一,同时手册、规范等工具书对于后压浆设计的参数取值范围较大。工程技术人员在进行桩基后压浆设计时往往无法确定桩端阻力及桩侧阻力提高倍数以及压浆影响范围等关键参数,以至于压浆效果估计不足造成浪费。本文通过对桩基承载力影响因素的分析和后压浆工艺作用机理的分析,可为灌注桩后压浆的设计提供一些参考。目前采用后压浆工艺的桩基多采用泥浆护壁钻孔灌注桩,采用后插钢筋笼灌注桩后压浆工艺的的工程应用很少,成功案例更是鲜见于报道。本文结合工程实例对后插钢筋笼灌注桩后压浆施工中的常见问题及应对措施做了较详细的说明。采用有限元分析的方法对灌注桩后压浆进行数值模拟,结合桩基载荷试验结果分析后压浆工艺对于单桩承载力的提高和桩顶沉降的减小效果。本文的研究内容及技术成果主要包括以下几个方面:(1)灌注桩施工技术及桩基承载力的确定方法;(2)对后压浆工艺提高单桩承载力的作用机理进行研究;(3)提出后插钢筋笼灌注桩后压浆工艺及控制措施。通过工程实践,提出后压浆工艺对于后插钢筋笼桩基承载力的提高作用以及工艺成功的保证措施;(4)结合工程实践,申请“一种桩侧压浆阀”实用新型专利和“一种注浆管与钢筋笼的连接方法”发明专利。
[Abstract]:The bearing capacity of single pile and reduce the pile settlement, grouting pile can improve the reduction cost, shorten construction period and the economic benefit is very considerable. The post grouting technology and technique of reinforcement cage after "strong alliance", the effect is better, and has very broad application prospects. However, people on the grouting effect the principle and effect of grouting is not a recognized, and manual parameter range specification tool for post grouting design greatly. Pile tip resistance and lateral resistance of the pile and grouting effect increased multiple range of key parameters are often unable to determine the engineering and technical personnel in the design of pile foundation after grouting, the grouting effect is estimated that due to the lack of waste. Through the analysis of influence factors of bearing capacity and grouting mechanism analysis of pile foundation, provide some reference for the design of pile post grouting. The post grouting technology The pile of Quito by slurry drilled pile, the engineering application of grouting technique of the reinforcement cage after pile after the few successful cases is rarely reported. Combining with the engineering example of reinforcing cage piles after pressing common problems and Countermeasures in the construction of slurry are described in detail. By using the finite element method for numerical simulation of grouting pile, pile load test results combined with the analysis of post grouting technology to improve the bearing capacity of single pile and pile top settlement reducing effect. Research contents and technical results of this paper mainly includes the following aspects: (1) method to determine the bearing capacity of construction technology and pile foundation pile; (2) of the post grouting technology of the mechanism to improve the ultimate bearing capacity of single pile is studied; (3) grouting process and control measures are put forward after reinforcing cage piles. Through the engineering practice, put forward after grouting The process improves the bearing capacity of the post inserted steel cage pile foundation and the guarantee measures for the success of the technology. (4) combined with the engineering practice, we apply for a new utility patent of a pile side pressure valve and a patent of "a connection method between the grouting pipe and the reinforcing cage".

【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753

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