我国下线了一台世界最长、直径最大的海底高铁隧道盾构机，该设备将投入甬舟铁路的建设。这台盾构机名为“定海号”，由10余万个零部件组成，刀盘开挖直径达14.57米，整机长度约135米，总重量约4350吨，是全球普通盾构机重量的8倍。
甬舟铁路金塘海底隧道的建设面临巨大挑战，既要承受0.85兆帕的水压，相当于普通自来水水压的12倍多，又要抵御海底环境的化学腐蚀。为了防止隧道漏水和海水腐蚀，盾构机在掘进时会同步填充由水泥浆液和添加剂组成的管片外层水泥壳体，形成一个封闭的壳体。
“定海号”盾构机还搭载了超前地质预报系统，利用盾构机刀盘滚刀破岩产生的震动信号进行前方50-100米地质精准探测，提前掌握隧道地质信息。金塘海底隧道采用双向盾构法施工，对接精度要求极高，此次盾构机的刀盘开挖直径为14.57米，但对接误差需小于20毫米，相当于一枚五角硬币的直径。
“定海号”盾构机配置的VMT导向系统可为盾构掘进提供精准的导向服务和姿态控制。此外，盾构机采用了双层壳体设计，便于拆卸和提高隧道坚固性。
英文翻译：
News Title: World’s longest and largest-diameter underwater high-speed railway tunnel shield machine launched in China
Keywords: Shield machine, Underwater high-speed railway tunnel, Yongzhou Railway
News Content:
China has launched a world’s longest and largest-diameter underwater high-speed railway tunnel shield machine, which will be deployed in the construction of Yongzhou Railway. The shield machine, named “Dinghai No.1”, is composed of more than 100,000 components, with a diameter of 14.57 meters for the cutter head, a total length of about 135 meters, and a total weight of about 4,350 tons, making it 8 times heavier than a conventional shield machine.
The construction of the Jintang underwater tunnel of Yongzhou Railway faces immense challenges, as it needs to withstand a water pressure of 0.85 MPa, which is 12 times higher than that of conventional tap water, and resist chemical corrosion in the underwater environment. To prevent tunnel leakage and corrosion, the shield machine will fill the outer layer of the tunnel lining with a closed shell composed of cement slurry and additives during tunneling.
The “Dinghai No.1” shield machine also incorporates an advanced geological forecasting system that utilizes vibration signals generated by the cutter head of the shield machine to conduct precision detection of geology within 50-100 meters ahead, allowing for early identification of tunnel geology. The Jintang underwater tunnel adopts a double-direction shield tunneling method, with extremely high requirements for对接精度. The diameter of the cutter head of the shield machine is 14.57 meters, but the joining error must be less than 20 millimeters, which is equivalent to the diameter of a five-cent coin.
The “Dinghai No.1” shield machine is equipped with a VMT guidance system that provides precise guidance and posture control for shield tunneling. In addition, the shield machine adopts a double-layer shell design for easy disassembly and improved tunnel durability.
【来源】https://www.ithome.com/0/744/737.htm
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