Abstract：Research purposes: When the intercity railway crossing the existing high － speed railway is built，the intercity railway crossing the existing bridge of the high － speed railway is often listed in the high － speed railway project and built in advance in order to avoid the disturb the traffic of the existing high － speed railway． Such kind of bridge often needs casting in － place． This paper studies how to erect the economic and reasonable scaffold above the high －speed railway to ensure the construction schedule，quality and security．
Research conclusions: ( 1) With the pier － top longitudinal support scaffolding method，the cast － in － place of the superstructure crossing the bridge can be conducted with security and high quality and efficiency． ( 2) By making full use of the pier top and space under the flange plate of the box beam to support the longitudinal bars along with sectional steel cross beam，it can be as the support platform for the outside modeling and operation． ( 3) By making full use of the existing materials，the cost can cut and the construction period can be reduced．
Tang Lifa． Discussion on Bridge Falsework Loading Test Methodology ［J］． Journal of Highway and Transportation Research and Development，2007 ( 9 ) : 149 － 151．
Wan Chengang，Yao Fahai． Calculation and Analysis of Impact of Prestress Tension on Cast － in － place Falsewrk ［J］． Journal of Railway Engineering Society， 2012( 5) : 30 － 34．
2013, Vol. 30 
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