The Shanghai Airport Link Line Lot II is the key control engineering of the whole line, with a shield machine tunnel length of 4939.8m and a single tunnel for double track design. The Lot II is now the first large diameter shield machine tunnel in China with a long distance and small spacing paralleling with a high-speed railway line in operation. The minimum distance between the tunnel and the Shanghai-Hangzhou High Speed Railway is only 8.1m, and the construction also involves crossing under important structures such as municipal highways, railways, and bridges, several times.
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