深圳地铁3 号线广深铁路桥梁桩基托换设计

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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．

Key words： high － speed railway continuous beam continuous rigid frame pile foundation underpinning

Received: 12 November 2011

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http://tdgcxb.crec.cn/EN/ OR http://tdgcxb.crec.cn/EN/Y2012/V29/I3/91