Abstract：Research purposes: Aiming at the key elements for safe jack-in construction of frame overpass bridge, the comprehensive analyses are made for the characteristics and applicable range of all track reinforcement systems and on which as well as through doing real tests on bridge, the verification is made for the safety of reinforcement system for jack-in construction of vertical and lateral beams under the condition of train speed limited to 45km/h for the purpose of providing theoretic basis for the design and construction of vertical and lateral beams with similar reinforcing system.
Research methods: The analysis method of the strength and rigidity is adopted for reinforcement system and the on-bridge test method is adopted with theoretical calculation and testing train.
Research conclusions : The analyses show the reinforcement system is suitable for jack-in construction of frame bridges with different spans, widths and axial lengths and the tests show the reinforcement system is safe and reliable under condition of train speed limited to 45km/h. This reinforcement system will be safe and reliable for higher speed if some improvements are made，so it is a good way for jack-in construction of bridge of existing line and worth being used widely.
孟国清. 既有线框构桥顶进施工纵、横梁加固体系的分析[J]. 铁道工程学报, 2007, 24(7): 42-46.
MENG Guo-qing. Analyses of Reinforcement System for Jack-in Construction of Vertical and Lateral Beams of Frame Bridge of Existing Railway Line. 铁道工程学报, 2007, 24(7): 42-46.
2007, Vol. 24 
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