On the morning of October 23, the opening ceremony of Hong Kong Zhuhai Macao Bridge, one of the seven wonders of the modern world, was held in Zhuhai, Guangdong Province. It will be officially opened to traffic on the morning of October 24. Do you know more about Hong Kong Zhuhai Macao Bridge?
How deep is the undersea tunnel of Hong Kong Zhuhai Macao Bridge
With a total length of 55km, the Hong Kong Zhuhai Macao Bridge integrates bridges, islands and tunnels, creating a world record of 'longest, largest span, deepest buried depth and largest volume' of immersed tunnels, covering a number of cutting-edge technologies of island tunnels and bridges in the world today, which is one of the most challenging projects in the world.
There are airplanes in the sky and ships in the sea. How can the Hong Kong Zhuhai Macao Bridge in the middle not affect the flight safety of the routes adjacent to Hong Kong International Airport, but also meet the navigation needs of 300000 ton ships in Lingdingyang channel?
The design team of Hong Kong Zhuhai Macao Bridge put forward a creative plan: to build two man-made islands in the East and the west, to build a subsea tunnel, and to connect the tunnel with the bridge. The world's longest subsea immersed tube tunnel is composed of 33 giant immersed tubes, each of which is 180 meters long, weighs about 80000 tons in a single section, and sinks to the seabed for more than 40 meters.
How can such a huge immersed tube settle to the seabed to realize docking? This requires floating installation. The so-called floating installation is to use a tugboat to transport the immersed tube to the bridge site, and then use the winch to move the immersed tube horizontally and vertically to the installation position and conduct the sinking installation. In order to ensure the successful completion of floating installation, Zhao Chengbi, an associate professor of South China University of technology, used physical model test and numerical simulation methods to study the key problems of floating, mooring and sinking of tunnel immersed pipe sections. This research really finds problems.
It is found that in shallow water area, under the action of current and wave, the problem caused by the action of longitudinal current on the pipe section is easy to be solved. However, if the pipe section is put into the sea due to the action of transverse current, it will generate heeling and sinking, and it is easy to touch the sea bottom, which is extremely unsafe. "Said Wang Dongjiao, an associate professor of the team. To further verify the reliability of the experiment, the team conducted experiments and calculations over and over again. Finally, it provides important technical support for the floating and sinking construction scheme of Hong Kong Zhuhai Macao Bridge.
In the installation of the main body of the bridge, the steel box girder bridge deck pavement represents the "face" project of the bridge construction, which provides the comfortable and safe driving of vehicles. "We abandoned the expensive imported epoxy asphalt bridge deck pavement technology and chose the British pouring asphalt pavement scheme. Professor Zhang Xiaoning of South China University of Technology said: 'but the construction efficiency of this scheme is low. According to this scheme, it will take about five years to complete the pavement project. They innovatively put forward the GMA construction scheme, which improves the construction efficiency by 10 times and completes the project within half a year. And the first full-scale model of bridge truncation which can satisfy the mechanical similarity is built at home and abroad.
How long is the undersea tunnel of Hong Kong Zhuhai Macao Bridge
With a total length of 6.7km, the subsea tunnel of Hong Kong Zhuhai Macao Bridge is the longest highway immersed tunnel and the only deep immersed tunnel in the world, and also the first offshore immersed tunnel in China.