It was learned from Zhejiang Provincial Communications Investment Group Co., Ltd. that a few days ago, the feasibility study report of the Ningbo Qijiashan to Zhoushan Jintang section of the Ningbo-Zhou Expressway double-track was officially approved by the Zhejiang Provincial Development and Reform Commission. This means that in the future, the world's longest undersea two-way six-lane highway tunnel has taken a key step towards the start of construction in September 2025. It also marks the start of the construction of the second passage of the Yongzhou Expressway, the longest connecting island expressway in China, the double-track construction of the Yongzhou Expressway.
As an important part of the Shanghai-Zhouzhou-Ningbo cross-sea channel, the Ningbo-Zhouzhou Expressway double-track has a total investment of about 31.4 billion yuan, a total length of about 46 kilometers, and adopts the standard design of two-way six-lane expressway, with an overall design speed of 100 kilometers per hour (the design speed of the undersea tunnel is 80 kilometers per hour). The overall route of the project starts from Beilun, Ningbo, passes through Jintang Island, Zhangzi Island, Fuyin Island and then ends at Zhoushan Island, and finally Dinghai Dasha in Zhoushan, which will be of great significance to improve the national highway network system, accelerate the construction of the Yangtze River Delta urban agglomeration and the Hangzhou Bay metropolitan area, and improve the transportation capacity and safety emergency response capacity of the Yongzhou cross-sea channel.
The core control project of the project is the Jintang Submarine Tunnel, with a total length of 11.6 kilometers, which is currently the longest two-way six-lane highway tunnel in the world, using 16-meter shield construction technology, with the characteristics of "super large, super long and super deep", and it is necessary to overcome world-class technical problems such as composite stratum crossing and underwater precise docking. The tunnel is basically parallel to the undersea tunnel of the Yongzhou Railway under construction, and the two are built in a common corridor, with a minimum horizontal net distance of about 46 meters, forming a parallel cross-sea transportation corridor of road and railway.
Jin Chaoyang, general manager of Zhejiang Communications Group Yongzhou Expressway Double Line Phase II Project Company, introduced that the Yongzhou Expressway Double Line Ningbo Qijiashan to Zhoushan Jintang section can be approved, with a total length of 18.1 kilometers, and the key project is the world's longest submarine two-way six-lane highway tunnel with a total length of 11.6 kilometers - Jintang Submarine Tunnel, which adopts 16-meter shield construction technology, and will also be the world's longest submarine highway shield tunnel, with the characteristics of "super large, super long, and super deep", as well as composite stratum crossing, underwater precise docking, The technical difficulty of construction such as dismantling in the submarine cave has reached the world-class level.(This article is from the official website of Seetao www.seetao.com. Reprinting without permission is strictly prohibited. Please indicate Seetao.com + original link when reprinting) Seetao.com Strategy Column Editor/Sun Fengjuan
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