在我国 ,采用沉管法修建大型水底交通隧道的历史不长 ,工程也较少。上海外环隧道于 1 999年1 2月 2 8日动工 ,2 0 0 3年 6月 2 1日正式建成通车。工程建设中涉及的干坞施工、管段制作、基槽浚挖和回填覆盖、岸壁保护工程、管段基础处理、管段接头和管段拖运沉放等一系列关键技? In our country, the use of immersed pipe method to build a large underwater traffic tunnel has a short history and few works. The Shanghai Outer Ring Tunnel started construction on February 28, 1999, and was officially opened to traffic on June 21, 2003. A series of key technologies such as dry dock construction, pipeline section fabrication, foundation trench dredging and backfill coverage, shore wall protection engineering, pipe section foundation treatment, pipe section joint and pipe section hauling and sinking are all involved in the project construction.