龙门大桥缆索吊装系统计算与监测

发布时间：2018-05-02 20:47

本文选题：缆索吊装系统 + 缆索核算　；参考：《重庆交通大学》2014年硕士论文

【摘要】：目前常见缆索吊装施工法是拱桥的施工的一种常见的方法。缆索吊装方法能够在地形复杂的山谷中,大型机械设备无法进场施工的地方进行对预制拱圈的吊装施工,然后将各预制段连接起来形成整体,最终形成主拱圈。该方法具有易操作、易掌握、施工方便、工艺简单、成本低、安全等特点。缆索吊装系统的运行安全性直接影响着施工安全和施工工期,本文为确保缆索吊装系统能够安全顺利的在施工中运行,主要研究工作如下： 1、对缆索吊装系统中的缆索进行计算。主索的计算,先假定空索和重索的跨中最大垂度,按照相应的简支梁进行计算,并进行安全系数核定。工作索的核算方法与主索的算方法一致。起重索的核算是对跑头拉力F计算及安全系数校核,再对每台起吊卷扬机容绳量及单根起吊绳长度计算,最后对起吊索引起的塔架不平衡荷载计算。牵引索复核验算,首先对最大牵引力验算,然后对牵引索安全系数验算,再对每侧牵引索长度验算,最后对牵引索作用在索塔上的外力计算。通过验算,证明缆索吊装系统中的各类索能够在施工中安全使用。对安装阶段拱箱受力和扣索受力验算。 2、对缆索吊装系统中的地锚及塔架基础复核。对地锚进行拔力稳定性复核。对塔架基础复核是通过采用SAP2000建立有限元模型进行计算,通过对拱箱吊装各个工况计算结果进行对比,对最不利工况下基础受力进行验算。通过验算得出,地锚能够在整个缆索吊装施工中正常的运行。 3、对缆索吊装系统在实际施工中,在不同荷载工况下对其进行监测,不同荷载工况分别是70%、100%和120%挂重试吊监测。观测的主要内容有,在不同荷载工况下对塔顶位移观测,塔架基础沉降监测,关键杆件应力监测,主索垂度观测以及主索索力监测。通过试吊监测证明缆索吊装系统能够安全的运行。
[Abstract]:At present, the common cable hoisting construction method is a common method of arch bridge construction. The cable hoisting method can be used to hoist the precast arch ring in the valley with complicated terrain where the large mechanical equipment can not enter the field, and then connect each prefabricated section to form a whole, and finally form the main arch ring. The method is easy to operate, easy to master, easy to construct, simple in technology, low in cost and safe. The safety of cable hoisting system has a direct impact on the construction safety and construction period. In order to ensure the cable hoisting system can run safely and smoothly in construction, the main research work is as follows: 1. Calculate the cable in the cable hoisting system. The calculation of the main cable is based on the assumption of the maximum sag in the span of the empty cable and the cable, the calculation is carried out according to the corresponding simply supported beam, and the safety factor is approved. The calculation method of the working cable is consistent with the calculation method of the main cable. The calculation of lifting rope is to calculate the running head tension F and safety factor, then calculate the capacity of each hoist and the length of single lifting rope, and finally calculate the unbalance load of tower caused by lifting rope. First, the maximum traction force is checked, then the safety factor of the traction cable, the length of each side of the traction cable, and the external force acting on the cable tower is calculated. Through checking calculation, it is proved that all kinds of cables in cable hoisting system can be safely used in construction. Check the force of arch box and buckle cable in installation stage. 2. Check the ground anchor and tower foundation in cable hoisting system. Check the stability of pulling force on the anchor. SAP2000 is used to establish finite element model to calculate the tower foundation. By comparing the calculation results of each working condition of hoisting the arch box, the stress of the foundation under the most unfavorable working condition is checked and calculated. Through checking calculation, the ground anchor can run normally in the whole cable hoisting construction. 3. The cable hoisting system is monitored under different load conditions in actual construction. The different load conditions are 70% 100% and 120% respectively. The main contents of the observation include the observation of tower top displacement under different load conditions, the monitoring of tower foundation settlement, the monitoring of stress of key members, the observation of main cable sag and the monitoring of main cable force. It is proved that the cable hoisting system can operate safely by means of test crane monitoring.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4

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