Preliminary Study on Standard Bridges for Viaduct Section of Suzhou-Changshu-Zhangjiagang Suburban Railway
The proportion of suburban railway bridges is large,but there is no unified bridge construction standard in the industry.The preliminary research of the project is cumbersome,and the project differences are large.The standardization and scientific level need to be improved.Taking Suzhou-Changshu-Zhangjiagang line of the urban railway as an example to conduct preliminary research on standard span bridges from the aspects of structural system,bridge span comparison and selection,design of substructure and other aspects.The results indicate that the simply supported beam of standard span which can adapt to the entire precast in beam yard and the construction method of erect by erection bridge machine is the chosen direction of the suburban railway.The double-line box girder is the optimal beam type for suburban railway.35 m is the optimal span of the suburban railway standard bridge.The 35 m beam can be designed with thin web and large-size prestressed tendon,the structural measurement is better.The longitudinal dimension of piers can be optimized.For piers with a height of 10 m or less,the longitudinal dimension can be reduced to 1.2 m,which the dynamic characteristic of the whole bridge can meet the code requirement.Driving piles is the most economical,but with many limitations.It is difficult to detect or judge the influence of the pre-bored and root enlarged precast pile and post-grouting of cast-in-place pile which both affected by compression pulp quality,so it can be used in a small number of tests.The conventional bored pile should still be the main pile foundation form for suburban railway bridges.
suburban railwayviaduct sectionstandard constructionengineering analogydetail analysis of sub-engineeringstructural systempierpile
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