温州瓯江北口大桥中塔沉井基础设计
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摘要
温州瓯江北口大桥主桥为主跨2×800m的三塔双层桥面钢桁梁悬索桥。针对该桥在深水、复杂海域环境中,中塔基础所受弯矩大、船撞力大及基岩埋深大的特点,中塔采用防撞能力强、刚度大、经济性更优的倒圆角矩形沉井基础。沉井总高68m,下部为填充混凝土的钢壳结构,高59m;上部为钢筋混凝土结构,高9m。在钢沉井高度方向上每隔1.5m设置1道水平桁架,内、外壁板设置竖向加劲肋。为保证结构耐久性,钢沉井壁板厚度预留腐蚀余量,并对上部钢沉井外表面进行重防腐涂装。建议设置沉井着床定位系统,并进行海床预防护控制沉井着床精度;采用严格控制结构水密性、设置射水管等措施保证沉井下沉的安全性及姿态可控。
The main bridge of the Oujiang River North Estuary Bridge in Wenzhou is a steel truss suspension bridge with a structure of three-tower and double-deck,having a main span of 2×800 m.The bridge in deep water and complex marine environment possesses following characteristics,for example,the middle tower foundation is subjected to large bending moment,large ship collision force,and the embedded depth of bedrock is deeply.Consequently,the chamfered rectangular open caisson foundation with strong anti-collision ability,high stiffness and better economy is adopted.The total height of the open caisson is 68 m,the lower part is structured with 59 m steel shell filled with concrete,and the upper part is structured with 9 mreinforced concrete.In the height direction of steel open caisson,a horizontal truss is set at an interval of every 1.5 m,and vertical stiffening ribs are set on the inner and outer panels.In order to ensure the durability of the structure,corrosion allowance is reserved for the thickness of the steel open caisson wall,and heavy corrosion protection coating is applied to the outer surface of the upper steel open caisson.It is suggested that an implantation positioning system of open caisson should be set up,and seabed preventive protection should be carried out to control the implantation accuracy of open caisson.Measures such as strict control of water tightness of structure and set up water-jet pipes are adopted to ensure the safety of open caisson sinking and pose controllable.
The main bridge of the Oujiang River North Estuary Bridge in Wenzhou is a steel truss suspension bridge with a structure of three-tower and double-deck,having a main span of 2×800 m.The bridge in deep water and complex marine environment possesses following characteristics,for example,the middle tower foundation is subjected to large bending moment,large ship collision force,and the embedded depth of bedrock is deeply.Consequently,the chamfered rectangular open caisson foundation with strong anti-collision ability,high stiffness and better economy is adopted.The total height of the open caisson is 68 m,the lower part is structured with 59 m steel shell filled with concrete,and the upper part is structured with 9 mreinforced concrete.In the height direction of steel open caisson,a horizontal truss is set at an interval of every 1.5 m,and vertical stiffening ribs are set on the inner and outer panels.In order to ensure the durability of the structure,corrosion allowance is reserved for the thickness of the steel open caisson wall,and heavy corrosion protection coating is applied to the outer surface of the upper steel open caisson.It is suggested that an implantation positioning system of open caisson should be set up,and seabed preventive protection should be carried out to control the implantation accuracy of open caisson.Measures such as strict control of water tightness of structure and set up water-jet pipes are adopted to ensure the safety of open caisson sinking and pose controllable.
引文
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[3]徐力,高宗余,梅新咏.沪通长江大桥公铁合建斜拉桥桥塔基础设计[J].桥梁建设,2015,45(3):7-12.(XU Li,GAO Zong-yu,MEI Xin-yong.Design of Pylon Foundations for Rail-cum-Road Cable-Stayed Bridge of Hutong Changjiang River Bridge[J].Bridge Construction,2015,45(3):7-12.in Chinese)
[4]肖德存,赵都桓,陆勤丰.超大型深水沉井结构分析和设计[J].桥梁建设,2010(5):47-49,73.(XIAO De-cun,ZHAO Du-huan,LU Qin-feng.Structural Analysis and Design of Very Huge Deepwater Caisson[J].Bridge Construction,2010(5):47-49,73.in Chinese)
[5]张巨生,宁伯伟.新建安九铁路长江大桥主航道桥设计[J].桥梁建设,2018,48(2):77-82.(ZHANG Ju-sheng,NING Bo-wei.Design of Main Ship Channel Bridge of Changjiang River Bridge on Newly Built Anqing-Jiujiang Railway[J].Bridge Construction,2018,48(2):77-82.in Chinese)
[6]邱远喜,肖海珠,李华云,等.援马尔代夫中马友谊大桥深水基础设计[J].桥梁建设,2018,48(6):93-98.(QIU Yuan-xi,XIAO Hai-zhu,LI Hua-yun,et al.Design of Deepwater Foundations of China-Maldives Friendship Bridge[J].Bridge Construction,2018,48(6):93-98.in Chinese)
[7]李军堂.沪通长江大桥主航道桥沉井施工关键技术[J].桥梁建设,2015,45(6):12-17.(LI Jun-tang.Key Techniques for Construction of Open Caissons of Main Ship Channel Bridge of Hutong Changjiang River Bridge[J].Bridge Construction,2015,45(6):12-17.in Chinese)
[8]张鸿,刘鹏.深水、大流速条件下大型沉井下沉河床防护技术研究[C]//第二十届全国桥梁学术会议论文集(上册).北京:人民交通出版社,2012:76-82.(ZHANG Hong,LIU Peng.Research of Riverbed Scouring Protection Techniques for Sinking of Large Open Caissons in Situation of Deepwater and Swift Current[C]//Proceedings of Twelfth National Bridge Academic Conference(Volume 1).Beijing:China Communications Press,2012:76-82.in Chinese)
[9]郑锋利,谷志敏.温州瓯江北口大桥中塔沉井冲刷防护技术[J].桥梁建设,2018,48(1):106-111.(ZHENG Feng-li,GU Zhi-min.Scouring Pre-Protection Techniques for Open Caisson of Middle Tower of Oujiang River North Estuary Bridge in Wenzhou[J].Bridge Construction,2018,48(1):106-111.in Chinese)
[10]南京水利科学研究院.瓯江北口大桥沉井施工期河床预防护试验报告[R].南京:2016.(Nanjing Hydraulic Research Institute.Test Report of River Bed Preventive During Construction of Open Caissons of Oujiang River North Estuary Bridge[R].Nanjing:2016.in Chinese)
[2]罗扣,舒思利,万田保,等.温州瓯江北口大桥中塔结构形式比选[J].桥梁建设,2018,48(1):88-93.(LUO Kou,SHU Si-li,WAN Tian-bao,et al.Comparison and Selection of Structural Type for Middle Tower of Oujiang River North Estuary Bridge in Wenzhou[J].Bridge Construction,2018,48(1):88-93.in Chinese)
[3]徐力,高宗余,梅新咏.沪通长江大桥公铁合建斜拉桥桥塔基础设计[J].桥梁建设,2015,45(3):7-12.(XU Li,GAO Zong-yu,MEI Xin-yong.Design of Pylon Foundations for Rail-cum-Road Cable-Stayed Bridge of Hutong Changjiang River Bridge[J].Bridge Construction,2015,45(3):7-12.in Chinese)
[4]肖德存,赵都桓,陆勤丰.超大型深水沉井结构分析和设计[J].桥梁建设,2010(5):47-49,73.(XIAO De-cun,ZHAO Du-huan,LU Qin-feng.Structural Analysis and Design of Very Huge Deepwater Caisson[J].Bridge Construction,2010(5):47-49,73.in Chinese)
[5]张巨生,宁伯伟.新建安九铁路长江大桥主航道桥设计[J].桥梁建设,2018,48(2):77-82.(ZHANG Ju-sheng,NING Bo-wei.Design of Main Ship Channel Bridge of Changjiang River Bridge on Newly Built Anqing-Jiujiang Railway[J].Bridge Construction,2018,48(2):77-82.in Chinese)
[6]邱远喜,肖海珠,李华云,等.援马尔代夫中马友谊大桥深水基础设计[J].桥梁建设,2018,48(6):93-98.(QIU Yuan-xi,XIAO Hai-zhu,LI Hua-yun,et al.Design of Deepwater Foundations of China-Maldives Friendship Bridge[J].Bridge Construction,2018,48(6):93-98.in Chinese)
[7]李军堂.沪通长江大桥主航道桥沉井施工关键技术[J].桥梁建设,2015,45(6):12-17.(LI Jun-tang.Key Techniques for Construction of Open Caissons of Main Ship Channel Bridge of Hutong Changjiang River Bridge[J].Bridge Construction,2015,45(6):12-17.in Chinese)
[8]张鸿,刘鹏.深水、大流速条件下大型沉井下沉河床防护技术研究[C]//第二十届全国桥梁学术会议论文集(上册).北京:人民交通出版社,2012:76-82.(ZHANG Hong,LIU Peng.Research of Riverbed Scouring Protection Techniques for Sinking of Large Open Caissons in Situation of Deepwater and Swift Current[C]//Proceedings of Twelfth National Bridge Academic Conference(Volume 1).Beijing:China Communications Press,2012:76-82.in Chinese)
[9]郑锋利,谷志敏.温州瓯江北口大桥中塔沉井冲刷防护技术[J].桥梁建设,2018,48(1):106-111.(ZHENG Feng-li,GU Zhi-min.Scouring Pre-Protection Techniques for Open Caisson of Middle Tower of Oujiang River North Estuary Bridge in Wenzhou[J].Bridge Construction,2018,48(1):106-111.in Chinese)
[10]南京水利科学研究院.瓯江北口大桥沉井施工期河床预防护试验报告[R].南京:2016.(Nanjing Hydraulic Research Institute.Test Report of River Bed Preventive During Construction of Open Caissons of Oujiang River North Estuary Bridge[R].Nanjing:2016.in Chinese)