How long is the British Cross-Harbour Tunnel?

The English Cross-Harbour Tunnel is 50.5 kilometers long.

The English Channel Tunnel, also known as the British-French Cross-Harbour Tunnel and the European Tunnel, is a railway tunnel from England to France. It is located between Dover Port in England and Calais Port in France. It connects Foxton in the south of England with Cogel in the north of France. February 1987+ 1 construction started, and February 1990+65438 tunnel started.

In order to reduce the risk of submarine construction and improve the reliability of operation and maintenance. There is a logistics service tunnel between the two single-track railway tunnels, and the transverse passage is connected with the two main tunnels, and there is a fire escape door at the joint.

The main function of the logistics service tunnel is to provide access for normal maintenance and emergency evacuation within the full length of the tunnel. The traffic, power supply, lighting, water supply, cooling, drainage, ventilation, communication and fire fighting system of the tunnel fully consider the requirements of emergency standby.

advanced technology

Western media and academic works all call the British Cross-Harbour Tunnel a great achievement in the history of human engineering. This is not only because its total length ranks first in the world, and it has invested a huge amount of money, but also because its works are huge. More than 7.5 million cubic meters of earth and stone have been excavated from the English Channel Tunnel, which is equivalent to the volume of three Great Pyramids of Egypt.

The steel used for tunnel lining alone is equivalent to three Eiffel Towers in France, and more importantly, many engineering and technical problems have been successfully solved. Its technical policy is reliable and advanced.

Reliability and advancement are not always unified, so the possibility of special innovative design for tunnel engineering is almost ruled out. On the contrary, it adopts tested and mature technology, and carefully selects standard designs from different countries in Europe and America in each component to ensure its high quality and reliability.

The successful comprehensive application of mature advanced technology in complex projects is a kind of creation in itself, which greatly reduces the project risk. This kind of technology policy and concept can be used for reference in the case of high-tech voice and universality in China.

How to find a proper balance between the advancement and reliability of technology and the limitation of funds and time is a problem worthy of serious study in various project decisions.