宜兴荆邑大桥双套拱塔竖转施工主要技术应用研究

发布时间：2018-04-29 06:35

本文选题：斜拉桥 + 双套拱塔　；参考：《石家庄铁道大学》2015年硕士论文

【摘要】：本文以宜兴荆邑大桥为工程实例,针对荆邑大桥大溪河钢箱梁双套拱斜拉桥双套拱塔提升中的主要施工技术进行了深入的总结研究。通过现场条件分析及方案研究,确定采用液压同步提升系统对双套拱塔进行竖转提升方案,即先利用临时塔架竖转提升主塔,然后利用主塔作为承重结构,同步竖转提升副塔就位。该方案工艺先进,具有安装工期短、拱塔质量易于控制、节约临时设备及机械的投入、结构安全更易保证等优点。竖转施工中临时塔架结构的安全、稳定性至关重要,为了更加有效的确保了竖转提升施工的成功进行,采用对门式塔架整体稳定性、门式塔架基础、门式塔架后拉稳定索、门式塔架后拉基础、主塔转铰及吊点、副塔转绞及吊点等主要及关键部位分别进行专门设计和有限元计算分析,确保了竖转提升构件性能满足提升施工的各项需要。主要通过钢绞线将钢拱塔构件上的各吊点与对应的液压提升器连接起来、再利用电脑控制各液压提升器同步动作将钢拱塔提升到位,是同步竖转提升施工技术的关键。液压提升器采用穿芯式构造形式,其两端楔型锚具有单个方向自动锁定功能,在锚具运行工作工程中,钢绞线会被自动锁紧,在锚具不运行工作即处于放松状态下,钢绞线会被放开可上下自由活动;同时提升索具采用用钢绞线。因此竖转提升技术安全能够得到保证、且承重构件安装运输便利、自身重量轻、中间不需要镶接等独特的优点。通过主、副钢拱塔正常竖转提升证明,钢拱塔安装主要施工技术安全、可靠、施工便利、安装质量精度易于控制,对相同工况下同类工程施工有良好的指导借鉴作用。
[Abstract]:Taking the Jingyi Bridge in Yixing as an engineering example, this paper makes a deep summary and study on the main construction technology of the double-set arch tower hoisting of the steel box girder double-set arch cable-stayed bridge of Jingyi Bridge. Through field condition analysis and project research, it is determined to adopt hydraulic synchronous lifting system to carry out vertical lifting scheme for double sets of arch tower, that is, to use temporary tower to vertical lift main tower first, and then to use main tower as load-bearing structure. Synchronous vertical hoisting of secondary tower in position. This scheme has the advantages of advanced technology, short installation period, easy quality control of arch tower, saving the input of temporary equipment and machinery, and easy guarantee of structural safety. The safety and stability of temporary tower structure are very important in vertical construction. In order to ensure the successful construction of vertical tower, the overall stability of portal tower, the foundation of gate tower, and the stable cable behind gate tower are adopted. The special design and finite element analysis are carried out on the main and key parts of the rear pull foundation of the portal tower, the main tower hinge and the lifting point, the auxiliary tower rotation hinge and the lifting point, respectively, which ensure that the performance of the vertical hoisting member can meet the requirements of the hoisting construction. The hoisting points on the steel arch tower members are connected with the corresponding hydraulic hoists through steel strands, and then the steel arch towers are hoisted in place by computer control, which is the key to the construction technology of synchronous vertical hoisting. The hydraulic hoist adopts the structure of piercing core, and its two end wedge-shaped anchors have the function of automatic locking in a single direction. In the working engineering of the anchors, the steel strands will be automatically locked, and the anchors will be in a relaxed state if the anchors are not in operation. Steel strands will be free to move up and down, while hoisting rigging uses steel strands. Therefore, the safety of vertical lifting technology can be guaranteed, and the load-bearing components are easy to install and transport, their own weight is light, and there is no need to insert in the middle of the unique advantages. Through the normal vertical hoisting of the steel arch tower, it is proved that the main construction technology of the steel arch tower is safe, reliable, easy to construct and easy to control the quality of installation, which can be used as a good guide for the construction of similar projects under the same working conditions.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4

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