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1、 河海大学本科毕业论文 0毕业论文现浇混凝土薄壁管桩复合地基研究学 院 继续教育学院专业年级 06 级交通土建工程学 号 013106411134 姓 名 刘义峰指导老师 蔡晓飞评 阅 人 蔡晓飞中国南京2009 年十二月 河海大学本科毕业论文 摘 要现浇混凝土薄壁管桩是一项全新的软基处理技术，该技术具有桩直径大，桩距大，混凝土用量省，单桩承载力高，工后沉降小，可处理深层软土等优点。它吸收了预应力混凝土管桩、振动沉管桩和振动沉模薄壁防渗墙等技术。桩身强度高,混凝土标号可从C10C30,直径可达1.5m,有效加固深度可达25m以上,施工工艺简单,可操作性强,便于质量控制监督,单桩承载力高而造价相
2、对较低。（1）对PCC桩的研制背景、设计原则、沉桩工艺、工作原理以及成桩机理进行了述评，阐述了PCC管桩技术优点。并对目前其主要设计方法进行了归纳。（2）介绍了现浇混凝土薄壁管桩（PCC桩）成桩工艺。结合PCC桩在上海市北环高速公路工程中的应用，在现场对PCC桩施工工艺进行了试验研究，探讨了混凝土坍落度、拔管速度、施打顺序对PCC桩质量的影响，并对其充盈系数进行了分析研究。同时还对PCC桩质量检测方法进行了研究，并对可能出现的质量问题及预防措施做了初步探讨。（3）在分析常用的软土地基加固技术适用性和局限性的基础上,详细介绍现浇混凝土薄壁管桩复合地基处理方法的加固机理、设计、施工、检测方法等,提
3、出路基“拱效应” 、土工格栅“拉膜效应”新观点,结合实例讲述现浇薄壁管桩处理地基的优越性、经济性。关键词: 薄壁管桩；施工工艺；质量检测；承载特性；承载力计算 河海大学本科毕业论文 IAbstractThe cast-in-place concrete thin wall steel pipe driven in as piling is an item of brand-new soft base processing technology, this technology has the pile diameter to be big, the pile is apart from in
4、a big way, the concrete amount used province, the single pile supporting capacity is high, after the labor subsides slightly, may process merits and so on in-depth soft soil.It absorbed the prestressed concrete steel pipe driven in as piling, the vibration has sunk the steel pipe driven in as piling
5、 and the vibration sinks technologies and so on mold thin wall cut-off wall.The cast-in-place thin wall steel pipe driven in as piling pile body intensity is high, the concrete marking may from C10C30, the diameter be possible to reach 1. 5 m, reinforces the depth to be possible effectively to reach
6、 above 25 m, the construction craft is simple, feasibility, is advantageous for the quality control surveillance, but single pile supporting capacity high construction cost relative low.(1) pair of PCC pile development background, the principle of design, the penetration of pile craft, the principle
7、 of work as well as became the pile mechanism to carry on the commentary, elaborated the PCC steel pipe driven in as piling technology merit.And has carried on the induction to the present its main design method. (2) introduced the cast-in-place concrete thin wall steel pipe driven in as piling (the
8、 PCC pile) becomes the pile craft.Unifies the PCC pile in Shanghai Shibei link highway project application, has conducted the experimental study in the scene to the PCC pile construction craft, discussed the concrete slump, the cupping speed, has executed hits the order to the PCC pile quality influ
9、ence, and has conducted the analysis research to its full coefficient.Simultaneously has also conducted the research to the PCC pile quality examination method, and to the quality question and the preventive measure which possibly appeared has made the preliminary discussion. (3) in the analysis com
10、monly used soft soil ground reinforcement technology serviceability and in the limited foundation, introduced in detail the cast-in-place concrete thin wall steel pipe driven in as piling compound ground processing method the reinforcement mechanism, the design, the construction, the examination met
11、hod and so on, proposed the roadbed “arches the effect”, the earthwork grill “pulls the membrane effect” the new viewpoint, unifies the example narration cast-in-place thin wall steel pipe driven in as piling to process the ground the superiority, the efficiency.Key word: Thin wall steel pipe driven in as piling; Construction craft; Quality examination; Load-supporting characteristics; Supporting capacity computation 河海大学本科毕业论文 II目 录摘 要 .IAbstract .II目 录 .III1 绪论 .11.1 桩基概况 .11.2 桩基的研究目的及意义 .11.3 复合地基的研究现状 .21.3.1 复合地基概述 .21.3.2 复合地基研究现状
