Taking Changjiang tunnel project in Shanghai as the background, this presentation systematically describes critical techniques of structure design on super large, extra long tunnel.

本报告以上海长江隧道为工程背景，系统地阐述了超大特长隧道结构设计的关键技术。

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The structure, constitute, working principle, and design feature of automatic welding system which pro- duces extra- thin, large diameter, long tube, and longitudinally or circle weld are introduced.

介绍了超薄壁，大直径，长筒体，纵、环缝自动焊接系统的结构、组成、工作原理及设计的主要特点。

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The security and dependability of the extra long bridge structure have become the general concern question of the society in these days.

特大型桥梁的结构安全可靠性已成为当今社会普遍关注的问题。

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