V墩三角刚架无系梁悬吊连续梁组合体系桥关键技术研究

发布时间：2018-12-14 06:55

【摘要】：随着生产力水平的逐步提高,桥梁结构在数量上大力发展的同时,也对美观性提出了要求。目前的桥梁跨越能力在逐步提高,新型材料的使用更加频繁,结构形式向多样化发展。组合式体系桥梁结构在适用性和美观性方面的优势,使其应用广泛。对该类桥型设计、施工关键技术的研究,对该类桥型的推广应用,有重要的意义。本文针对V墩三角刚架无系杆悬吊连续梁组合体系桥的特点,从设计和施工方面对其进行研究,为类似结构的设计和施工提供借鉴。针对桥址的环境特点,构思了异型系杆拱桥和多点弹性支撑连续梁桥两种组合桥型方案,通过对比论证,多点弹性支承连续梁(刚梁柔索)方案进行桥梁设计。对比了三角刚架悬吊连续梁组合体系、V形刚构体系和连续梁结构下的结构性能。对房山五渡桥的主墩、主梁、刚架(主塔)、吊杆、限位阻尼装置等局部结构的设计进行了研究。根据设计结构尺寸,对该桥的变形、应力和索力进行了有限元分析。验证本方案以连续梁桥受力为基础,通过在主梁跨中设置吊杆来减小活载对梁体的作用,减小活载对主梁的变形影响;V墩增跨措施减小梁体内力进而减小截面尺寸和配筋。针对V墩三角刚架无系杆悬吊连续梁组合体系桥的结构特点,创立了倾斜型内锚预压式钢-混结合段精细化施工工艺,实现了带高强螺栓预压力的倾斜型钢-混凝土结合段的顺利施工。通过开发钢框架组合模板定型产品和与之配套的施工技术,解决了大体积V型墩施工问题。研究了刚塔架预制、吊装、焊接的施工关键技术,对安全度汛措施进行了优化。
[Abstract]:With the gradual improvement of productivity level, the bridge structure develops energetically in quantity, but also puts forward the request for aesthetics. At present, the bridge span capacity is gradually improved, the use of new materials is more frequent, and the structural forms are diversified. The advantages of composite bridge structure in applicability and aesthetics make it widely used. The research on the key technology of design and construction of this kind of bridge is of great significance to the popularization and application of this kind of bridge. In view of the characteristics of V-pier triangular rigid frame bridge without tie rod suspension continuous beam composite system bridge, the design and construction of the bridge are studied in order to provide reference for the design and construction of similar structures. In view of the environmental characteristics of the bridge site, two kinds of combined bridge schemes are conceived, which are irregular tied arch bridge and multi-point elastic support continuous beam bridge. Through comparison and demonstration, the multi-point elastic support continuous beam (rigid beam flexible cable) scheme is designed. The structural properties of suspension continuous beam system with triangle rigid frame, V rigid frame system and continuous beam structure are compared. The design of main pier, main beam, rigid frame (main tower), suspender and limit damping device of Fangshan Wudu Bridge is studied. The deformation, stress and cable force of the bridge are analyzed by finite element method. It is verified that this scheme is based on continuous beam bridge, by setting suspenders in the main beam span to reduce the effect of live load on beam body, and reducing the influence of live load on the deformation of main beam, and reducing the internal force of beam body by increasing the span of V pier and then reducing the section size and reinforcement. According to the structural characteristics of V-pier triangulated rigid frame suspension continuous beam composite bridge without tie bar, the fine construction technology of steel-concrete composite section with inclined internal anchor preloading is established. The smooth construction of inclined steel-concrete joint section with high-strength bolt pre-pressure is realized. The construction problem of large volume V-shaped pier is solved by developing steel frame composite formwork and matching construction technology. The key construction techniques of precast, hoisting and welding of the rigid tower are studied, and the safety flood control measures are optimized.
【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】：U445.4

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