1月10日，世界首座设计标准为350公里时速的汕汕铁路汕头湾海底隧道迎来施工“重器”，整机长度160米、刀盘直径14.57米的超大直径混合式盾构机“永平号”近日在生产厂家顺利下线，计划于今年3月底在汕头湾海底隧道北岸盾构隧道段起点下井始发掘进施工。
汕汕铁路汕头湾海底隧道，位于汕头市汕头湾内，是国内首座、同时也是世界首座设计标准为350公里时速、跨海大直径盾构的高铁海底隧道，全长约9.8公里，其中盾构段长度2169米。盾构机将自始发井开始，依次穿越890米软土、430米上软下硬及809米全断面硬岩。
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