Abstract：Research purposes: The existing railway concrete simply － supported beam bridge is mainly of medium and small span style． The theory and practice showed after the train speed － raise，the lateral stiffness of the most beam was not enough and the pier stiffness was not enough because the pier section was small． They could not meet the speed － raise requirement，so it was necessary to reinforce the beam and pier． For the upgrading plan of the Luohe － Fuyang Railway，the study was done on the reinforcing technology for the existing railway concrete simply － supported beam bridge and the the experience of it was summed up for offering the reference to the similar works．
Research conclusions: Strengthening the transverse connection of the diaphragm of the concrete simple － supported beam can well control the lateral vibration of the bridge． Adding the beam bonding steel plates and the external prestressing steel strands can effectively increase the load － bearing capacity of the beam． Enlarging the cross section of the pier can greatly enhance the lateral rigidity of the piers． The existing railway concrete simply － supported beam bridge reinforced by taking the above measures can meet the speed － raise requirements．
Huang Bo． Enlarging Project of Guiyang － liuzhou Railway Study on Main Technical Standards ［J］． Journal of Railway Engineering Society，2010( 8) : 1 － 6．
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2011, Vol. 28 
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