摘要
浙江东苕溪大桥采用(75+228+75)m自锚式空间索形悬索-斜拉体系,该桥采用"先缆后梁"方案施工,以避免施工期对航道的干扰。针对该桥"先缆后梁"吊装施工,在已有临时固结法的基础上,提出了塔梁临时锚固法,即施工中通过边跨加劲梁和塔梁临时锚固装置(由格栅架、传力撑及竖向限位装置组成)将主缆水平力传递给桥塔基础来实现中跨加劲梁的吊装施工,待加劲梁合龙后,通过合龙口间隙调整装置(由反力牛腿和千斤顶组成)调整合龙口间隙,将主缆水平力再从桥塔基础平稳地转移到加劲梁,完成体系转换。为保证塔梁临时锚固装置和桥塔基础的受力安全,采用有限元法对其进行受力分析,结果表明,塔梁临时锚固装置及桥塔基础的受力均满足规范要求。
The Dongtiaoxi River Bridge in Zhejiang is a spatial cable self-anchored suspension and cable-stayed system bridge with span arrangement （75 ＋ 228 ＋ 75） m. The superstructure of the bridge was constructed, using the hoisting construction method of erecting the main cables be-fore erecting the stiffening girder in order to avoid the interference of the construction with the ship channels. For the hoisting construction of the superstructure, a temporary anchoring method of the towers and stiffening girder was proposed based on the existing temporary fixity method. Spe-cifically speaking, in the proposed method, the horizontal forces of the main cables were to be transmitted to the tower foundations in the construction through the temporary anchoring devices （composed of the grillages, force transmitting struts and vertical limiters） of the towers and side span stiffening girder so that the hoisting construction of the central span stiffening girder could be realized. After the stiffening girder was closed, the closure gap of the stiffening girder was adjusted, using the adjusting devices （composed of the reaction force corbels and jacks） arranged at the closure gap. The horizontal forces of the main cables were then steadily transmitted from the tower foundations to the stiffening girder and the system transformation of the structure was to be completed. To ensure that the mechanical safety of the temporary anchoring devices and the tower foundations, the mechanical analysis of the devices and the foundations was carried out, u-sing the finite element method. The results of the analysis indicated that the mechanical behavior of the anchoring devices and the foundations could all satisfied the relevant requirements in the codes.
出处
《桥梁建设》
EI
CSCD
北大核心
2016年第4期114-119,共6页
Bridge Construction
基金
国家自然科学基金项目(51308055)
教育部高校博士新教师基金项目(20130205120001)
中国博士后科学基金项目(2013M532000)~~
关键词
自锚式悬索-斜拉桥
“先缆后梁”法
吊装
塔梁临时锚固装置
合龙口间隙
有限元法
受力分析
桥梁施工
self-anchored suspension and cable-stayed bridge
method of erecting main cable before erecting stiffening girder
hoisting
temporary anchoring device of tower and stiffening girder
closure gap
finite element method
mechanical analysis
bridge construction
