摘要
杭州钱江铁路新桥位于钱塘江强涌潮地区,部分墩水下承台基础采用拉森Ⅵ型钢板桩围堰施工。以该桥56号墩为例,介绍拉森Ⅵ型钢板桩围堰施工及计算。钢板桩围堰施工期间,其外侧土压力按静止土压力,内侧土压力按被动土压力计算。2种最不利工况,第1种为钢板桩围堰吸泥完成到封底前,主要确定钢板桩入土深度及验算钢板桩、围檩及内支撑强度和刚度;第2种为钢板桩围堰抽水完成后,仅验算钢板桩围堰、围檩及内支撑强度和刚度。强涌潮时分2种工况计算:第1种为在钢板桩围堰整体计算模型上增加迎潮面涌潮压力;第2种为在钢板桩围堰整体计算模型上增加迎潮面和两侧面涌潮压力。
The new Hangzhou Qiantangjiang River Railway Bridge is located in the strong tidal bore area of the Qiantangjiang River and part of the in-water pier bases of the Bridge are constructed by the Larssen Ⅵ steel sheet pile cofferdam. By way of example of Pier No. 56 of the Bridge, the calculation for construction of the cofferdam is introduced. In the process of the construction, the soil pressure outside the cofferdam is calculated in terms of the static soil pressure while the soil pressure inside is calculated in terms of the passive soil pressure. There are two kinds of the most unfavorable load cases for the construction of the cofferdam, i. e., the Case 1 from the completion of air-lifting to the starting of bottom sealing, the penetration depth of the sheet piles into soil is mainly determined and the strength and rigidity of the sheet piles, wailing and internal supports are checked, and the Case 2 after dewatering from the cofferdam, the strength and rigidity of the sheet piles, wailing and internal supports will be checked only. The calculation for the construction at the time of strong tidal bore also incorporates two load cases, i.e., the Case 1, on the calculation model of the global cofferdam, the tidal bore pressure on the attacking surface of the cofferdam is added and the Case 2, on the calculation model, the tidal bore pressure on the attacking surface and both side surfaces of the cofferdam will be added.
出处
《桥梁建设》
EI
CSCD
北大核心
2009年第5期49-52,共4页
Bridge Construction
关键词
铁路桥
承台
强涌潮
钢板桩
围堰
计算
railway bridge
pier base
strong tidal bore
steel sheet pile
cofferdam
calculation
