How many kilometers is the Dalian Cross-Harbour Tunnel?

Dalian Bay subsea tunnel is located in the sea area of Dalian Bay, which is a cross-sea passage connecting Zhongshan District and Ganjingzi District of Dalian City, Liaoning Province, China, and the first large-scale cross-sea immersed tunnel in northern China. Dalian Bay Cross-Harbour Tunnel starts from Renmin Road, Donggang Business District, Dalian in the south, passes through Dalian Bay in the lower part and reaches No.20 Road, Suoyu Bay, Dalian in the north. The total length of the tunnel is 5. 1 km.

Among them, the submarine immersed tunnel is 3 kilometers long, the land area is 1.8 kilometers long, and the connecting road is 0.3 kilometers long; The road is designed as a two-way six-lane urban expressway with a design speed of 60 km/h. The Dalian Bay subsea tunnel was completed on September 29th, 2022. It was opened to traffic on May 1 day, 2023.

Difficulties in the construction of Dalian Bay subsea tunnel

1, Dalian Bay subsea tunnel has many new tests, such as complex engineering geological conditions, small tunnel curve radius, concrete durability test in cold sea area, complicated navigation conditions and so on, which are difficult to construct and require high quality.

2. The sea area where the E 1 pipe joint of Dalian Bay subsea tunnel is constructed is a rock foundation, and the geological conditions are poor, so it is impossible to use full-crane conventional climbing boat to insert piles.

3. Dalian is located in the northeast of China, and the cold weather in winter will bring a lot of inconvenience to the construction, which is a great test for both ship equipment and construction personnel.

4. The geology of Dalian Bay subsea tunnel construction area is complex and changeable, with geological joints all over gullies, gullies, boulders and stalagmites, and rich in red clay in the middle.

5. There are many caves and cracks in the construction area of Dalian Bay subsea tunnel, and the cracks in rock foundation are developed. Five of the 18 immersed tubes are located on the clay layer. In this part of the construction, it is necessary to dig up the clay, fill it with gravel again, and vibrate and level it before installing the immersed tube.

Reference to the above content: Baidu Encyclopedia-Dalian Bay Cross-Harbour Tunnel