深水逆作法与顺作法钢板桩围堰施工受力性能对比  

Comparison of Stress Performance of Steel Sheet Pile Cofferdam with Top-down and Bottom-up Construction Method

作　　者：李洪涛 LI Hongtao(School of Civil Engineering,Tianjin University,Tianjin 300354,China;Railway Pontoon Bridge Division of Combat Readiness,Jinan Shandong 250000,China)

机构地区：[1]天津大学建筑工程学院,天津300354 [2]铁道战备舟桥处,山东济南250000

出　　处：《中国铁路》2022年第11期55-62,共8页China Railway

摘　　要：钢板桩围堰具有强度高、施工灵活、经济适用等优点,尤其适合应用在承台面尺寸小、水流较浅、流速较缓的施工项目中,但随着水深不断加大,钢板桩的承载性能受到严峻考验,当水深超过10 m时,便无法大规模采用钢板桩围堰进行施工。为解决深水领域下的钢板桩围堰施工问题,首次提出了一种新式的钢板桩围堰施工方法——深水逆作法;依托常益长铁路沅江特大桥520~#—522~#墩的承台施工项目,研究一种内支撑整体下放系统与内支撑拆除技术,同时将原设计的吊点位置通过增设托梁由围堰上方移至堰角内侧,有效解决了打桩和吊放的工序冲突问题;并采用计算机模拟软件对各工况下围堰结构的变形受力情况进行分析。结果显示,采用深水逆作法进行钢板桩围堰的施工工作可以有效解决施工水域水过深、传统钢板桩施工法无法满足施工要求的问题。Steel sheet pile cofferdams have the advantages of high strength,flexible construction and lower cost,and are especially suitable for construction projects with small pile cap surface,shallow water flow and slow flow velocity.However,the increase of water depth has a negative impact on the bearing performance of steel sheet pile.When the water depth exceeds 10 m,steel sheet pile cofferdam cannot be used for large-scale construction.In order to facilitate the construction in deep water,the top-down method is proposed for the first time:based on the pile cap construction project of 520—522piers of Yuanjiang Super Major Bridge of CYC HSR,the paper studies an internal support overall lowering system and internal support removal technology.Meanwhile,the existing lifting point position is moved from the top of the cofferdam to the inner side of the cofferdam corner by adding a joist,which effectively optimizes the operation process of piling and hoisting;computer simulation software is also used to analyze the deformation and stress of cofferdam structure under various working conditions.The results show that the top-down method can successfully solve the problem relating to deep water in the construction area and meet the requirements in comparison to the traditional method.

关 键 词：深水逆作法 顺作法 围堰施工 受力性能 新型施工工艺 施工工序 

分 类 号：TU47[建筑科学—结构工程]