铁道标准设计2024，Vol.68Issue(8)：78-85,8.DOI:10.13238/j.issn.1004-2954.202302060005
滨海强腐蚀环境高速铁路桥梁混凝土结构耐久性设计研究
Durability Design and Research on High-speed Railway Bridge Concrete Structure in Coastal Environment with Strong Corrosion
摘要
Abstract
The coastal salt pan of Shijiazhuang-Hengshui-Cangzhou-Huanghua Port Intercity Railway project is a highly corrosive environment.In order to ensure the long-term operation safety of the bridge structure,it is urgent to carry out relevant durability research and improve the durability of the bridge structure in this project.Through detailed investigation and analysis of the erosive environmental characteristics of the bridge engineering in this region,the exposed environment of the bridge structure is evaluated,durability design of the bridge concrete structure is carried out,and the following research results are presented.In view of the corrosive environment problems faced by railway engineering,the principle of overall design scheme is proposed.The mix ratio design of bridge pier pile-cap and cast-in-place pile in coastal corrosive environment is conducted,and the preparation technology of high durability concrete suitable for coastal salt pan corrosive environment is formed.The structural design of durability is studied,structural design principle and physical isolation design concept are proposed,the structural design control measures are proposed to improve durability,and the structural physical isolation measures are designed to effectively improve the durability of bridge structure.In view of the erosion characteristics of the project,additional strengthened protection measures are put forward,including the silane impregnation protection and the application of corrosion resistant reinforce-ment.The permeable formwork cloth is studied and applied to improve the construction quality and compaction of concrete.An exposure test station is set up in the engineering site and a wireless monitoring system for reinforced concrete durability is developed.The whole process of reinforcement corrosion monitoring is realized through the wireless monitoring system.Through the durability design and research of concrete structure of bridge in the coastal environment with strong corrosion,the purpose of improving the durability of railway concrete structure under the harsh service condition of coastal salt pan has been achieved.At the same time,The solid foundation has been laid for the later evaluation of the durability of the bridge structure during the service period.关键词
高速铁路/强腐蚀性环境/铁路桥梁/混凝土结构/耐久性/构造设计/透水模板布/无线监测系统Key words
high-speed railway/highly corrosive environment/railway bridge/concrete structure/durability/structural design/permeable formwork cloth/wireless monitoring system分类
交通工程引用本文复制引用
陈兆毅..滨海强腐蚀环境高速铁路桥梁混凝土结构耐久性设计研究[J].铁道标准设计,2024,68(8):78-85,8.基金项目
中国国家铁路集团有限公司科技研究开发计划重点课题(N2020G055) （N2020G055）
