超大型深水沉井结构分析和设计_肖德存
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( China Railw ay M ajor Br idg e Reconnaissance & Desig n Institute Co., L td., W uhan 430050, China)
Abstract: T he main bridg e of T aizhou Chang jiang Riv er H ighw ay Br idge is a three- t ow er suspensio n bridge. T he fo undat ion f or t he int er mediate t ow er o f t he bridg e employ s t he very huge deepw ater caisson t hat is o f the r ect angular shape w it h rounded co rners on t he plane and that is 76 m in height . T he low er part of t he caisso n is t he steel shell concret e st ruct ure w hile t he upper part is t he reinf orced concret e st ruct ure. In considerat io n of t he const ruction m et hods to be used for t he caisson, t he st ruct ural design and checking calculat ion f or t he most unfavor able st at us of the caisson in t he w hol e const ruct ion process and in t he service st ag e are made. T he results of the calculat ion show that t he inclinat ion ang le of t he caisson in t he f loating st age is <= 0. 6b, Q- a= 7. 1 m. When t he caisso n is sunk to its desig ned elevat ion and under condit ion t hat t he soil below the cut t ing edg e of t he caisson is dr edged of f, t he height above t he fo ot ing of the cutt ing edge is equal to a sect ion of the caisson w all t hickness thereof and t he m ax imum co mpressive st ress of the w all is 9. 34 M Pa. T he maxim um and minimum st ress in t he caisso n base is respect ively 1. 64 MP a and 0. 159 M Pa. T he t heo ret ic set tlement am ount of t he caisson is 2. 5 cm w hile the act ually reserved sett lement amo unt is 5 cm, w hich can all satisfy t he requirem ent s in t he relevant specif -i cation s.
Key words: suspension bridg e; bridge fo undat ion; caisson; st ruct ural design; stabilit y; st ress analy sis
1引 言 沉井按下沉环境不同可分为陆地沉井和浮运沉
井。桥Biblioteka Baidu工程在水深达到一定条件下一般采用浮运 沉井。以泰州长江公路大桥中塔沉井为例, 结合深
收稿日期: 2010- 06- 23 作者简介: 肖德存( 1978- ) , 男, 工程师, 2002 年毕业于西南交通大学土木工程专业, 工学学士( x iaodc@ b rdi. com. cn) 。
48
关键词: 悬索桥; 桥梁基础; 沉井; 结构设计; 稳定性; 应力分析
中图分类号: U443. 131
文献标志码: A
Structural Analysis and Design of Very Huge Deepwater Caisson
XIAO De-cun, ZHAO Du-huan , LU Qin-f eng
超大型深水沉井结构分析和设计 肖德存, 赵都桓, 陆勤丰
47
文章编号: 1003- 4722( 2010) 05- 0047- 03
超大型深水沉井结构分析和设计
肖德存, 赵都桓, 陆勤丰
( 中铁大桥勘测设计院有限公司, 湖北 武汉 430050)
摘 要: 泰州长江公路大桥主桥为三塔悬索桥, 中塔采用超大型深水沉井基础。沉井平面采 用倒圆角矩形, 高 76 m, 下部为钢壳混凝土结构, 上部为钢筋混凝土结构。结合该桥中塔沉井施工 方法, 对其在整个施工和使用过程中的最不利状态进行结构设计和验算。计算结果表明: 沉井在浮 运阶段倾斜角 <= 0. 6b, Q- a= 7. 1 m; 下沉至设计标高, 刃脚下的土已被掏空的情况下, 刃脚根部以 上高度等于该处壁厚的一段沉井的井壁最大压应力为 9. 34 M Pa; 沉井最大和最小基底应力分别为 1. 64 M Pa 和 0. 159 M Pa; 沉井理论沉降量为 2. 5 cm , 实际预留沉降量为 5 cm, 均满足规范要求。
Abstract: T he main bridg e of T aizhou Chang jiang Riv er H ighw ay Br idge is a three- t ow er suspensio n bridge. T he fo undat ion f or t he int er mediate t ow er o f t he bridg e employ s t he very huge deepw ater caisson t hat is o f the r ect angular shape w it h rounded co rners on t he plane and that is 76 m in height . T he low er part of t he caisso n is t he steel shell concret e st ruct ure w hile t he upper part is t he reinf orced concret e st ruct ure. In considerat io n of t he const ruction m et hods to be used for t he caisson, t he st ruct ural design and checking calculat ion f or t he most unfavor able st at us of the caisson in t he w hol e const ruct ion process and in t he service st ag e are made. T he results of the calculat ion show that t he inclinat ion ang le of t he caisson in t he f loating st age is <= 0. 6b, Q- a= 7. 1 m. When t he caisso n is sunk to its desig ned elevat ion and under condit ion t hat t he soil below the cut t ing edg e of t he caisson is dr edged of f, t he height above t he fo ot ing of the cutt ing edge is equal to a sect ion of the caisson w all t hickness thereof and t he m ax imum co mpressive st ress of the w all is 9. 34 M Pa. T he maxim um and minimum st ress in t he caisso n base is respect ively 1. 64 MP a and 0. 159 M Pa. T he t heo ret ic set tlement am ount of t he caisson is 2. 5 cm w hile the act ually reserved sett lement amo unt is 5 cm, w hich can all satisfy t he requirem ent s in t he relevant specif -i cation s.
Key words: suspension bridg e; bridge fo undat ion; caisson; st ruct ural design; stabilit y; st ress analy sis
1引 言 沉井按下沉环境不同可分为陆地沉井和浮运沉
井。桥Biblioteka Baidu工程在水深达到一定条件下一般采用浮运 沉井。以泰州长江公路大桥中塔沉井为例, 结合深
收稿日期: 2010- 06- 23 作者简介: 肖德存( 1978- ) , 男, 工程师, 2002 年毕业于西南交通大学土木工程专业, 工学学士( x iaodc@ b rdi. com. cn) 。
48
关键词: 悬索桥; 桥梁基础; 沉井; 结构设计; 稳定性; 应力分析
中图分类号: U443. 131
文献标志码: A
Structural Analysis and Design of Very Huge Deepwater Caisson
XIAO De-cun, ZHAO Du-huan , LU Qin-f eng
超大型深水沉井结构分析和设计 肖德存, 赵都桓, 陆勤丰
47
文章编号: 1003- 4722( 2010) 05- 0047- 03
超大型深水沉井结构分析和设计
肖德存, 赵都桓, 陆勤丰
( 中铁大桥勘测设计院有限公司, 湖北 武汉 430050)
摘 要: 泰州长江公路大桥主桥为三塔悬索桥, 中塔采用超大型深水沉井基础。沉井平面采 用倒圆角矩形, 高 76 m, 下部为钢壳混凝土结构, 上部为钢筋混凝土结构。结合该桥中塔沉井施工 方法, 对其在整个施工和使用过程中的最不利状态进行结构设计和验算。计算结果表明: 沉井在浮 运阶段倾斜角 <= 0. 6b, Q- a= 7. 1 m; 下沉至设计标高, 刃脚下的土已被掏空的情况下, 刃脚根部以 上高度等于该处壁厚的一段沉井的井壁最大压应力为 9. 34 M Pa; 沉井最大和最小基底应力分别为 1. 64 M Pa 和 0. 159 M Pa; 沉井理论沉降量为 2. 5 cm , 实际预留沉降量为 5 cm, 均满足规范要求。