基于拉萨柳梧大桥工程对钻孔灌注桩施工技术应用研究

发布时间：2018-05-13 03:27

本文选题：钻孔灌注桩 + 后压浆技术　；参考：《长安大学》2015年硕士论文

【摘要】：随着我国建筑业的蓬勃发展,钻孔灌注桩应用的领域也越来越广泛。钻孔灌注桩作为桩基础按成桩方法分类中的一种重要桩型,具有承载力大、对周边环境影响小、能适应各种复杂地质条件等优点。利用钻孔灌注桩施工,能够有效提高工程效率,达到进度控制的最初目标,同时减轻成本,施工所要使用的设备也较为简单、便捷。但是,钻孔灌注桩也存在着其弱点,由于灌注桩桩端土层比较软弱,会对桩基的稳定性和承载能力产生削弱作用,特别是砂土和黄土地区的桥梁更是如此,再加上其自身结构的特殊性,还会对桥梁桩基产生诸多的危害。已有研究和生产实践表明,后压浆技术能够弥补这一不足,能够极大的提高桩侧摩擦力和桩端承载力。虽然后压浆技术有了很多理论上的探索,但该技术应用还不够广泛,也缺乏相关的技术规范,因此在实际施工中没有达到预想的效果,很多工程技术人员没有采取这项技术,导致了诸多的浪费。本文在调研国内外相关资料的基础上,对钻孔灌注桩技术的基本原理、施工方案、施工方法及承载力的影响因素进行了归纳总结,并分析了后压浆钻孔灌注桩的加固机理和注浆施工参数,得出结论:利用后压浆技术,一定程度上能够提高桥梁桩的承载力,进而减小桩径、缩短桩长;其次,对钻孔灌注桩每个施工阶段的施工质量控制方法、施工中易出现的质量问题及相应的处理措施、以及钻孔灌注桩的质量检测方法进行了分析,为该技术的应用提供了参考;最后,以拉萨柳梧大桥为依托工程,结合工程实际,介绍了桩端后压浆钻孔灌注桩的应用,重点介绍了施工技术要求和工艺流程,为后压浆技术的推广应用提供了理论指导和应用参考。
[Abstract]:With the vigorous development of construction industry in China, the application of bored pile is more and more extensive. As an important pile type in the classification of pile foundation according to the method of pile formation, bored cast-in-place pile has the advantages of large bearing capacity, little influence on the surrounding environment, and can adapt to various complicated geological conditions. The construction of bored cast-in-place pile can effectively improve the engineering efficiency, achieve the initial goal of schedule control and reduce the cost. The equipment to be used in construction is also relatively simple and convenient. However, the bored pile also has its weakness. Because the soil layer at the end of the pile is weak, it will weaken the stability and bearing capacity of pile foundation, especially the bridge in the area of sand and loess. In addition, the particularity of its own structure will cause a lot of harm to the bridge pile foundation. The existing research and production practice show that the post-grouting technology can make up for this deficiency, can greatly improve the friction force and pile end bearing capacity. Although the post-grouting technology has been explored in theory, it is not widely used and lacks relevant technical specifications. Therefore, it has not achieved the desired results in actual construction, and many engineering technicians have not adopted this technology. Led to a lot of waste. Based on the investigation and investigation of relevant data at home and abroad, this paper sums up the basic principle, construction scheme, construction method and the influencing factors of bearing capacity of bored cast-in-place pile. The reinforcement mechanism and grouting construction parameters of post-grouting bored cast-in-place pile are analyzed. The conclusion is drawn that the bearing capacity of bridge pile can be improved to a certain extent by using post-grouting technology, and then the diameter of pile can be reduced and the pile length can be shortened. The construction quality control method in each construction stage of bored cast-in-place pile, the quality problems in construction and the corresponding treatment measures, as well as the quality inspection method of bored cast-in-place pile are analyzed, which provides a reference for the application of this technology. Finally, based on the Lhasa Liuwu Bridge and the engineering practice, this paper introduces the application of bored pile with post-grouting at the end of the pile, and emphatically introduces the technical requirements and technological process of the construction. It provides theoretical guidance and application reference for the popularization and application of post-grouting technology.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.551

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