《500米级钢管混凝土拱桥建造创新技术》介绍了大跨径钢管混凝土拱桥及以其为劲性骨架的混凝土拱桥的建造数量、跨径及重要关键施工技术。钢管混凝土拱桥是钢拱桥拱圈中一部分钢被混凝土代替，以混代钢部分只用钢价1/27，拱圈架设重量只为钢拱的1/2，所以架设速度快、风险低，造价低，地基能提供有效抗力时，代替钢拱是必然趋势，在软弱地基建系杆拱，值得比较。
作者郑皆连院士是中国近几十年拱桥发展的见证者、参与者与创新者，为总结近期的成功经验，推动钢管混凝土拱桥及劲性骨架混凝土拱桥建设，进一步提高质量、降低造价及风险，向更大跨径发展。本书内容获2018年国家科技进步二等奖。作者及带领的团队参与并指导了当前世界最大跨径钢管混凝土拱桥、劲性骨架混凝土拱桥建设的成功经验，在工程实践中不断对原有理论和技术进行创新和完善，因此形成的成果具备极强的实践性和指导意义。

《500米级钢管混凝土拱桥建造创新技术》对500米级钢管混凝土拱桥建造工程实践理论和技术进行创新和完善，形成的成果具备极强的实践性和指导意义。围绕跨径500米级钢管混凝土拱桥及劲性骨架混凝土拱桥设计、施工、混凝土材料、大型临时施工设施进行了深入研究，提高了工程质量，降低了造价和施工风险。

Among the four types of bridges,arch bridge stands out due to its good mechan-ical performance.To be specific,its arch ring is generally under small eccentriccompression,so it is free of fatigue problems.Arch bridge is also characterized bylong durability,high stiffness and strong cost competitiveness.Before the Indus-trial Revolution,arch bridge was the best choice for in-land rivers serving navigationpurposes aroundthe world.At thattime,arch bridges were constructed upon brackets,which posed high risks in flood control.To this end,Josef Milan,an Austrian engi-neer,introduced the steel-reinforced concrete (SRC)arch bridge with a stiff skeleton
in 1898.Chinese engineers made further improvement on SRC arch bridges by usingconcrete-filled steel tubular(CFST)arch as the stiff skeleton and ingeniously devel-oped load adjustment techniques,which further led to reduced construction costand risks of concrete arch bridges.Moreover,the construction of arch ring by abracket-free technique is another symbol signifying the achievement of modern archbridges.
Driven by the large-scale construction of highways and railways in China andsupported by the bracket-free techniques for arch ring construction,concrete-filledsteel tubular(CFST)arch bridges and steel-reinforced concrete (SRC)arch bridgeswith a stiff skeleton have developed very rapidly.The first CFST arch bridge,theWangcang East River Bridge with a span of 115m,was built in 1990.By 2018,morethan 460 CFST arch bridges and SRC arch bridges have been built.The Hejiang FirstYangtze River Bridge with a span of 530 m has been in operation for 6 years.ThePingnan Third Bridge with a span of 575m is expected to open to traffic in 2020.It is a rare phenomenon in the history of bridge development that the number andspan length of CFST and SRC arch bridges increased so quickly over the past threedecades in China.
Technology innovations proposed by Chinese engineers have promoted the fastand healthy development of arch bridges.The cable-stayed fastening and hangingassembly technology developed in 1968 and the arch ring rotation technologyproposed in 1977 realized the construction of CFST arch bridges and SRC archbridges without brackets.Furthermore,in-depth research has also been conductedon the design therioes,construction techniques,materials and equipment for thesetwo types of arch bridges spanning over 500 m,thereby resulting in better quality,lower construction cost and risks.
The author of this book,Zheng Jielian,an academician of the Chinese Academyof Engineering,has been a witness,participant,and innovator of arch bridges overthe past 30 years.In this book,he summarized the experiences and directions ofCFST arch bridges and SRC arch bridges.It can be served as a good reference forbridge engineers,researchers and students majoring in bridge engineering.I believethat the publication of this book will contribute to the further development of archbridges in China.
Shanghai,ChinaOctober 2019
Xiang Haifan

郑皆连 中国工程院院士，广西大学博士生导师，教授级高级工程师，路桥工程专家。长期从事桥梁设计、施工、管理工作，致力于拱圈无支架施工工艺研究，首创了我国双曲拱桥无支架施工新工艺，解决了不立拱架修建拱桥的难题。在调控劲性骨架混凝土拱桥浇筑拱圈混凝土过程中发生的瞬时应力及降低拱圈永存应力的研究和实践中取得了重大突破，指导了世界最大跨径钢管混凝土拱桥、劲性骨架混凝土拱桥的成功建设，为我国这两类拱桥的高质量、高速度发展及技术领先世界做出了重大贡献。曾获国家科技进步奖三项、李国豪桥梁原创技术奖等奖项。