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1、预应力混凝土变截面连续箱梁主墩钢板桩围堰计算XXX特大桥主桥28#墩水下承台，考虑左幅桩基静载试验与右幅承台浇筑同时进行，现考虑左、右幅承台进行整体钢板桩围堰施工，与原承台方案分开围堰有所区别，特编制本补充方案，与原方案共同形成水下承台安全专项方案组成部分。一、工程简介XXX大桥主桥起止桩号为：KCC+472.5～K90+692.5，长度为220m。其中26、29号墩为过渡墩，处在岸上，左右分离，每幅承台下设计6根直径1.5米的钻孔桩，桩长分别为75米、65米，承台尺寸为10.3×6.4×2.5米，墩身为矩形薄壁空心截面，截面尺寸为8.25×2.5米；主墩处于水中，
2、左右分离，每幅承台下设计9根直径2.0米的钻孔桩，桩长为95米，承台尺寸为13.6×13.6×3.5米，墩身为矩形薄壁空心截面，截面尺寸为8.25×4.0米。主墩承台顶标高为1.9m，底标高为-1.6，最高施工水位+1.88m，河床标高约-2.7m，拟采用钢板桩围护方案进行承台施工。钢板桩选用Ⅳ型拉森钢板桩；钢板桩围堰内围檩选用488H型截面与C25钢筋砼0.5*0.5m截面，围檩内支撑及角撑选用工地现有的φ530mm钢管桩、488H型钢、I45b工字钢及C25钢筋砼支撑梁0.8*0.5m截面，共设三层，第一层围檩及支撑位于承台顶+2.4m处，第二层围檩及支撑处于-
3、0.6m，第三层围檩及支撑位于承台底-1.85m，其中第二层围檩及支撑只是在抽水过程中使用，第三层钢筋砼（C25）围檩及支撑施工完毕砼强度达到设计的80%后，即可拆除第二层围檩及支撑。钢板桩底标高-9.1m，如下图所示：andmunicipalpartyCommitteesessionplenarysession,addingmeasures,promotetheXXeconomic,socialandculturaldevelopment.(A)theprimaryresponsibilityforfulfillingParty5yearsXXtownguided
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