港珠澳大桥CB04标段131号墩台吊装结构设计及分析

发布时间：2019-04-11 16:40

【摘要】：港珠澳大桥CB04标段预制件(整墩)模块化吊装作业是港珠澳大桥工程施工中的关键环节,作业难度较大大,环境危险复杂,工程精度要求较高。而墩台为钢筋混凝土结构且总重达2044吨,鉴于吊件自重较大,且吊装作业环境比较复杂等因素,为了保证整墩模块吊装过程安全可靠、准确稳妥,本论文设计一套安全可行的复杂吊装系统,包括吊架、上部吊具、下部吊具及吊装索具等。钢箱梁式结构具有高抗弯扭能力、高稳定性、高抗疲劳性能、高吊重能力、低挠度变形等优点,同时考虑到可行性、经济性及施工环境等因素,墩台吊装吊具最终选择钢箱梁式结构。对于吊具构件的材料选择也是至关重要的,钢箱梁式吊装构件的盖板及外腹板等主要部位材料选用Q420B低合金钢,而加强板、隔板和封板等次要部位材料选用Q345B低合金钢,构件中连接轴和高强螺栓均采用40Cr材料制作。依据不同的起吊重量等因素,墩台吊装使用的索具选择为高性能无接头绳圈。本文还结合墩台吊装吊具设计方案,使用HyperMesh、Ansys等软件对吊装吊具整体结构进行结构设计、三维建模、有限元应力应变分析及可靠性分析,根据分析结构对吊具结构进一步优化改进,得到最终方案,并依据吊具分析结果制定吊装工艺流程。最终方案的分析结果表明,墩台吊装吊具整体构架一阶屈曲系数为27.334,二阶屈曲系数为29.451,三阶屈曲系数为40.984,吊具结构稳定性较好,满足工程要求。而吊具结构的应力、应变值均在材料允许的范围内,则其强度、刚度均达到工程要求。本论文的研究,对港珠澳大桥CB04标段预制件(整墩)模块化吊装安全、稳妥作业提供了技术保障,同时对提高大型构件吊装过程中的高效性、准确性、安全性及行为的可预测性具有重大意义。
[Abstract]:Modular hoisting of prefabricated parts (whole piers) in CB04 section of Hong Kong-Zhuhai-Macao Bridge is a key link in the construction of Hong Kong-Zhuhai-Macao Bridge. The operation is more difficult, the environment is dangerous and complex, and the engineering precision is required. The pier and abutment are reinforced concrete structure with a total weight of 2044 tons. In view of the large self-weight of the lifting parts and the complicated working environment of the lifting, in order to ensure the safety, reliability, accuracy and stability of the lifting process of the whole pier module, This paper designs a set of safe and feasible complex hoisting system, including the hanger, the upper hanger, the lower hanger and the hanger, and so on. The steel box girder structure has the advantages of high bending and torsion resistance, high stability, high fatigue resistance, high lifting capacity, low deflection and deformation, taking into account such factors as feasibility, economy and construction environment, etc. The steel box girder structure is finally selected for the pier and abutment hoisting hanger. It is also very important for the material selection of hanger members. Q420B low alloy steel and Q345B low alloy steel are used for the main parts of the steel box girder type hoisting member, such as the cover plate and the outer web, while the secondary material such as the reinforcement plate, the partition and the sealing plate are used as the Q345B low alloy steel. The connecting shaft and high strength bolt are made of 40Cr material. According to different lifting weight and other factors, the cable used in pier and abutment hoisting is selected as high-performance joint-free rope. In this paper, the structure design, three-dimensional modeling, finite element stress-strain analysis and reliability analysis of the whole structure of the lifting crane are carried out by using HyperMesh,Ansys and other software, combined with the design scheme of the crane on the pier and abutment. According to the analysis structure, the hanger structure is further optimized and improved, the final scheme is obtained, and the hoisting technological process is worked out according to the result of the analysis of the hanger. The results show that the first-order buckling coefficient is 27.334, the second-order buckling coefficient is 29.451 and the third-order buckling coefficient is 40.984. The stability of the suspension structure is good and meets the engineering requirements. The stress and strain values of the hanger structure are within the allowable range of the material, so the strength and stiffness of the suspension structure meet the engineering requirements. The research in this paper provides technical guarantee for modular hoisting safety and safe operation of prefabricated parts (whole pier) of CB04 section of Hong Kong-Zhuhai-Macao Bridge, at the same time, it can improve the efficiency and accuracy of the hoisting process of large-scale components. Safety and predictability of behavior are of great significance.
【学位授予单位】：大连交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.559

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