Abstract: at present, the construction of high-speed railway in China is in full swing. In addition, the topography of the central and western regions is more complex, there are many canyons and rivers, so a large number of bridges need to be built in the process of building railways. Because of its advantages such as convenient transportation and light quality, aluminum alloy bridge will have a broad potential market.
Super Engineering, one of the Seven Wonders of the Modern World.
The Hong Kong-Zhuhai-Macao Bridge is another major infrastructure construction project in China after the three Gorges Project and the Qinghai-Tibet Railway, which is praised as one of the "seven wonders of the modern world" by the Guardian. In the process of the construction of the Hong Kong-Zhuhai-Macao Bridge, the wisdom and painstaking efforts of the vast number of state-owned enterprise builders have been condensed. The hard work of the builders has led to the achievement of this super project that has attracted worldwide attention.
Where is industrial aluminum used in the bridge?
In the Hong Kong-Zhuhai-Macao Bridge project with a total length of about 55 kilometers, it is mainly composed of the main project of Haizhong Bridge Island Tunnel and the connection lines of Hong Kong, Zhuhai and Macao, and the island tunnel project is the core control project of Hong Kong-Zhuhai-Macao Bridge. it also includes east and west artificial islands and submarine immersed tube tunnels, and aluminum veneer is used in the facade of the artificial islands.
About 50,000 square meters of aluminum veneers are used for the access ceilings and curved panels of the Hong Kong-Zhuhai-Macao Bridge.
Moreover, when the super typhoon "mangosteen" landed along the coast of Guangdong and Hainan this year, all the conditions of the Hong Kong-Zhuhai-Macao Bridge were normal.
How much do you know about aluminum alloy bridges?
The bridge project of the Hong Kong-Zhuhai-Macao Bridge uses 425000 tons of steel and about 60 Eiffel towers, which is the first project to use steel box girders on such a large scale in the world. Although it is the first choice for such a large tonnage bridge to use steel structure, compared with steel, aluminum alloy has lower density and lighter weight, which is only 34% of the same volume of steel, and the strength index is basically the same as steel. At the same time, it has excellent elastic modulus and good anti-corrosion performance, and the structural maintenance cost is low, so it has been widely used in modern bridge construction.
Look at the Development of Aluminum Alloy Bridges abroad.
Between 1949 and 1985, about 35 aluminum alloy bridges were built in Britain, while about 20 aluminum alloy bridges were built in Germany in 1950-1970. The construction of a large number of bridges provides valuable experience for future generations to build aluminum alloy bridges.
Looking at the Development of Aluminum Alloy Bridges in China.
1. China's current high-speed rail construction is in full swing. In addition, the topography of the central and western regions is more complex, there are many canyons and rivers, so a large number of bridges need to be built in the process of building railways. Because of its advantages such as convenient transportation and light quality, aluminum alloy bridge will have a broad potential market.
2. Steel is prone to rust and poor performance at low temperature. Steel rust will seriously affect the firmness of the bridge, not only bring greater maintenance costs, but also have serious safety risks. On the other hand, the poor performance at low temperature will make the steel bridge unable to be used normally in some harsh climatic conditions. Aluminum alloy materials generally have strong corrosion resistance, and the low temperature performance is not reduced, so it can be widely used in a variety of climatic conditions, and durable. Although the cost of aluminum alloy bridge is generally high, the low maintenance cost in the later stage may reduce the price gap to a certain extent.
3. The research on aluminum bridge deck at home and abroad has been very mature and widely used. The continuous improvement of the level of material research and development also provides a technical guarantee for the research and development of new alloys that meet different performance requirements. In recent years, domestic aluminum manufacturers have gradually focused on the field of industrial aluminum profiles. Technically, it provides the basis for the construction of aluminum alloy bridges.
4. The construction of the subway in the major cities in China has very strict requirements for the pressure from the ground. Due to the great advantage in quality of aluminum alloy bridges, it can be predicted that more aluminum alloy footbridges and highway bridges will be designed and used in the future.