水域承台可周转钢吊箱设计与施工技术

Design and Construction Technology of Reusable Steel Suspension Box for Water Base Slab

温州市域铁路S3线附属配套工程(瑞安段)永宁大桥项目是集市域铁路、快速路、一级公路、慢行系统等功能于一体的复合型特大桥,采用双层桥梁建设。其中,跨飞云江主桥部分设计采用主跨260m刚性悬索桥,水中共计7个墩(Z02~Z08),均采用有底钢吊箱进行施工。因其承台结构尺寸相近,经过数种施工方案的分析、比较、筛选,创新性地提出了“可周转使用钢吊箱”的设计理念并在永宁大桥项目成功实施。该技术在保证施工工期的情况下,充分周转使用钢吊箱结构,有效节约了成本,增加了效益,同时为后续水域桥梁施工提供了相关经验。

Yongning Bridge Project in Wenzhou Municipal Railway S3 Line Auxiliary Supporting Project(Ruian Section)is a composite grand bridge integrating the functions of municipal railway,expressway,first-class highway,slow travel system etc.,and is a double-deck bridge,in which the main bridge spanning the Feiyun River is designed of a rigidity suspension bridge with 260-m main span,and there are 7 piers(Z02~Z08)in the water.All are constructed with bottom steel suspension boxes.Because of its similar size of base slab structrues,after the analysis,comparison and screening of several construction schemes,the design concept of"reusable steel suspension box"is innovatively proposed and is successfully implemented in the Yongning Bridge Project.Under the condition of ensuring the construction period,the steel box suspension structure can be fully reused by this technology,which effectively saves costs and increases benefits,and can provide relevant experience for subsequent water bridge construction.