Ballast line connection from the pipe tunnel to be extended to ballast well in the DB tank on port as well as Stbd side.
管弄出来的压载管路接头延伸至左右舷的双层底压载水井中。
The pipe section of the immersed tunnel 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。
Underground tunnel, high pressure bifurcated pipe, water inlet tunnel designing and their lining style need know crustal stress too.
地下洞室和高压岔管、输水隧道设计及选择衬砌方式，需要查明原地应力状态。
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