多矮塔斜拉桥边跨现浇段无配重托架设计与施工  

Design and Construction of Unbalanced Bracket for Side Span Cast-in-site Segment of Multi-low-tower Cable-stayed Bridge

作　　者：应世明 赵鑫 田连民 张镇东 陈浩然 赵勃 袁阳光 YING Shiming;ZHAO Xin;TIAN Lianmin;ZHANG Zhendong;CHEN Haoran;ZHAO Bo;YUAN Yangguang(China Communications Road and Bridge Construction Co.,Ltd.,Beijing 100027,China;School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an,Shaanxi 710055,China)

机构地区：[1]中交路桥建设有限公司,北京100027 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《施工技术（中英文）》2024年第18期65-68,82,共5页Construction Technology

基　　金：陕西省自然科学基础研究计划-面上项目(2023-JC-YB-321)。

摘　　要：为研究多矮塔斜拉桥边跨现浇段无配重托架设计方法,并进一步完善与之匹配的施工流程,首先,依托西拉沐沦河特大桥边跨现浇段构造特征,提出无配重托架设计方法。其次,考虑无配重托架在边跨现浇施工过程中的外部荷载,通过有限元模拟,研究无配重托架受力性能,包括变形及材料强度冗余度情况,并明确了无配重托架局部构造的受力控制要点。最后,结合西拉沐沦河特大桥工程实践,总结完善了基于无配重托架的边跨现浇段施工流程,并明确了与无配重托架相关的施工注意要点。结果发现:所设计无配重托架在施工荷载下的最大变形为3.14mm,满足变形控制要求。无配重托架材料强度冗余度≥29.6%,安全储备良好;局部构造的材料强度冗余度≥65.5%,安全储备更高。西拉沐沦河特大桥工程应用效果显示,所设计无配重托架适用性良好。建议后续应用时,对箱梁中部对应的托架中间区域做进一步加劲处理。To investigate the design method of unbalanced bracket for side span cast-in-site segment of multi-low-tower cable-stayed bridge,and meanwhile develop the corresponding construction process,firstly,the design method of unbalanced bracket was firstly proposed according to the structural features of side span cast-in-site segment of Xila Mulun River Bridge.Secondly,by considering the external loads of unbalanced bracket during construction of side span cast-in-site segment,the mechanical properties of unbalanced bracket were researched through finite element simulation,including the deformation and material strength redundancies.The mechanical control points for the local structures of unbalanced bracket were also provided.In the last,the construction process of side span cast-in-site segment based on unbalanced bracket was summarized according to the engineering practice of Xila Mulun River Bridge,and the construction precautions related to unbalanced bracket were pointed out.The results show that the maximum vertical deformation of the designed unbalanced bracket under construction loads is 3.14mm,which can meet the requirement of deformation control.The redundancies of material strength are greater than 29.6%,which can meet the safety requirement.The redundancies of material strength of local structures are greater than 65.5%,which has a higher safety redundancy.The engineering application in Xila Mulun River Bridge indicates that the designed unbalanced bracket has a good applicability.It is suggested that in the following engineering practices,the central region of the bracket that corresponds to the middle of box girder can be further reinforced.

关 键 词：桥梁工程 斜拉桥 矮塔斜拉桥 边跨现浇 无配重托架 设计 施工技术 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U445.4[交通运输工程—道路与铁道工程]