Abstract：Research purposes: With the developmenst of city and the metro construction，the cross － interference between the metro and the existing bridge is inevitable，and the conflict between the metro construction and ensuring the existing bridge safety is increasingly clear． Combined with the bridge pile foundation underpinning project of the tunnel in the section between Hongling Station and Laojie Station of Line 3 of Shenzhen metro for crossing the Guangzhou －Shenzhen High － speed Railway，in this paper，the introduction is given in details to the difficult points and key points in design of the pile foundation underpinning of the railway continuous girder and continuous rigid frame bridge，to the construction monitoring and to the adjustment of linear design for providing the references to pile foundation underpinning of existing railway bridge under the complex construction environment and complicated geological conditions．
Research conclusions: According to the key points and difficult points in design of the pile foundation underpinning project，the relative measures should be taken and the works of informatization management and the system control should be well done to guarantee the smooth implementation of the pile foundation underpinning and bridge structure safety．
毛学锋,许智焰 胡京涛. 深圳地铁3 号线广深铁路桥梁桩基托换设计[J]. 铁道工程学报, 2012, 29(3): 91-95.
MAO Xue － feng，XU Zhi － yan，HU Jing － tao. Design of Bridge Pile Foundation Underpinning of Line 3 of Shenzhen Metro for Crossing Guangzhou － Shenzhen Railway. 铁道工程学报, 2012, 29(3): 91-95.
Li Dongmei． Research on the Risk Analysis of Piling Exchange for Metro Line 1 in Shenzhen［J］． Journal of Railway Engineering Society， 2008( 96) : 91 － 94．
［8］ 路刚． 地铁建设中桩基托换技术应用研究［D］． 天津: 天津大学， 2007．
Lu Gang． Application Study of Pile Foundation Underpinning Technology in Subway Construction［D］．Tianjin : Tianjin University，2007．
2012, Vol. 29 
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