The pipe section of the immersedtunnel is the large-volume concrete structure, which is complicated in the structure shape.
沉管隧道工程中的管段为大体积混凝土构件，结构形式较为复杂。
2
Depending on different conditions in different projects, construction methods for immersedtunnel vary with their respective features.
由于工程建设条件的不同，沉管隧道建设的方法也各具特点。
3
Some key issues related with excavation by a super-large shield machine and the design and construction of immersedtunnel in deep seawater and torrent conditions are also listed.