南方某市政大桥穿越深厚淤泥层钢护筒内力及稳定性分析  

Internal Force and Stability Analysis of Steel Casing for a Municipal Bridge Crossing the Deep Silt Layer in the South

作　　者：鲁德新 周晓宇 Lu Dexin;Zhou Xiaoyu(China Railway Investment Group Co.,Ltd.,Beijing 100071,China)

机构地区：[1]中铁投资集团有限公司,北京市100071

出　　处：《北方交通》2024年第4期21-24,共4页Northern Communications

摘　　要：南方某市政大桥地质为深厚淤泥层,深度30m左右,设计采用钢护筒穿越淤泥层。原设计中钢护筒壁厚为8mm,实施过程中,由于钢护筒壁薄,刚度较小,吊装过程中发生变形。钢护筒下沉期间,采用振动锤锤击,在激振力作用下,钢护筒变形严重,导致在钻孔过程中经常出现卡钻、卡锤情况。通过模拟检算钢护筒下沉时在振动锤作用下的变形及应力情况,合理确定钢护筒壁厚为14mm。A municipal bridge in the south has a deep silt layer with a depth of about 30m.The steel casing is used in the design to cross the silt layer.The wall thickness of the steel casing is 8mm in the original design.However,during the implementation process,due to the thin wall and low stiffness of the steel casing,deformation occurs during the lifting process.During the sinking of the steel casing,the vibratory hammer is used for hammering.Under the excitation force,the steel casing deforms severely,resulting in frequent jamming and hammer jamming during the drilling process.The wall thickness of the steel casing is reasonably determined to be 14mm by simulating and calculating the deformation and stress during the sinking of the steel casing under the action of the vibratory hammer.

关 键 词：钢护筒壁厚 钢护筒变形 应力检算 稳定性分析 

分 类 号：U445.551[建筑科学—桥梁与隧道工程]