echemi logo
Product
  • Product
  • Supplier
  • Inquiry
    Home > Coatings News > Paints and Coatings Market > Extreme Challenge! 64 innovative technologies to help Hong Kong-Zhuhai-Macao Bridge break through the bridge's "100-year practice"

    Extreme Challenge! 64 innovative technologies to help Hong Kong-Zhuhai-Macao Bridge break through the bridge's "100-year practice"

    • Last Update: 2020-12-12
    • Source: Internet
    • Author: User
    Search more information of high quality chemicals, good prices and reliable suppliers, visit www.echemi.com
    From 100 to 120, 20 years may be just a drop in the ocean of the vast universe, but for the life of China's bridges, is a breakthrough, is an innovation, is the crystallization of Chinese hard work and wisdom. The Hong Kong-Zhuhai-Macao Bridge breaks through the "100-year practice", in which a new coating and cathode protection joint protection technology independently developed by the Institute of Metals of the Chinese Academy of Sciences has played an important role in the project, and China's anti-corrosion coating technology has reached a new level.
    extreme challenge! 64 innovative technologies to help the Hong Kong-Zhuhai-Macao Bridge break through the bridge "100-year practice
    The Hong Kong-Zhuhai-Macao Bridge is located in a high-salinity coastal and offshore area, belonging to the highest corrosion level type . In view of this environment, the Hong Kong-Zhuhai-Macao Bridge is coated with a long-lasting heavy anti-corrosion system. It is understood that the Chinese Academy of Sciences metal material durability protection and engineering research began in the 1990s, more than 20 years has carried out heavy anti-corrosion coating technology foundation and application of research and development and production.
    The Chinese Academy of Sciences, based on the basic research of heavy anti-corrosion coatings, developed and produced two series of heavy anti-corrosion coatings, namely SEBF melting combined epoxy powder coatings and SLF polymer composite coatings, with an annual production scale of up to a thousand tons; Fully automatic internal and external coating production lines and small and medium-sized coating production lines, has been installed in the country 8;Steel pipe pile coating technology breakthrough cathode protection problem
    most of the steel pipe composite piles of the Hong Kong-Zhuhai-Macao Bridge are located in the mud area, the coating damage is mainly derived from the piling process of mechanical damage, mud and gravel bruises and long-term erosion of corrosion factors under the mud, degradation and so on. Researchers from the Institute of Metals of the Chinese Academy of Sciences focused their research on the protective coating system in solving the problems of scratch resistance, wear resistance and long-term service resistance to seawater permeability, cathode stripping and long-term wet adhesion, microbial resistance and so on.
    For the specific sea mud environment of the Hong Kong-Zhuhai-Macao Bridge, the researchers of the Institute of Metals of the Chinese Academy of Sciences carried out the research and development of the relevant coating from the time of the bridge demonstration, and successively solved the durability of the coating from the key performance indicators such as the anti-permeability of the coating and the anti-cathode stripping, and finally ensured the 120-year durability design requirements of the coating.
    extreme challenge! 64 innovative technologies to help the Hong Kong-Zhuhai-Macao Bridge break through the bridge "100-year practice
    First of all, the researchers abandoned the traditional practice of cathode protection, boldly adopted the new method of installing protection of the mud under the area in the sea water, through the sacrificing anode in the sea to launch the cathode protection current through the interface to the steel pipe in the sea mud, so as to solve the problem that replacing the sacrificing anode in the sea mud is too difficult.
    the initial design, calculations are needed to predict the rationality of the design. Although the application of computer to the ocean structure using numerical technology to design cathode protection system has been developed rapidly, but the cathode protection model is the need to electrolyte as a uniform medium as a hypothesis premise, and in the actual environment, the geological layer through the steel pipe pile in the physical and chemical performance is very different.
    the institute found in practice that the current cathode protection model is not suitable for the current Hong Kong-Zhuhai-Macao Bridge steel pipe composite pile cathode protection design. The researchers then selected extreme cases to estimate the protective effect, that is, to calculate whether the cathode protection in the soil resistivity in the two cases of cathode protection can meet the protection requirements, and use this as a similar engineering cathode protection design as a means. After completing the calculation verification, the researchers decided to conduct a simulation test to verify the feasibility of the cathode protection design of the steel pipe composite pile of the Hong Kong-Zhuhai-Macao Cross-Sea Bridge. Although the test results do not fully reflect the actual cathode protection status, it can also provide a basis for testing the design of cathode protection.
    researchers in accordance with the ratio of 1:20, simulation diameter of 2.2 meters, length of 90 meters of steel pipe piles, the soil environment in the installation also as far as possible to simulate the Hong Kong-Zhuhai-Macao Bridge steel pipe composite pile through the geology, that is, 5 layers of structure. The results show that the installation of high-efficiency sacrificing aluminum anode in seawater can fully protect the steel pipe piles in the sea mud, that is, the new cathode protection method can meet the protection requirements.His high-performance coated rebar technology to do special protection
    Li Jing said: "Hong Kong-Zhuhai-Macao Bridge foundation bridge using concrete is offshore concrete, offshore concrete in addition to strength and mixing and ease should meet the design and construction requirements, in the anti-permeability, anti-freeze, corrosion resistance, prevent corrosion of steel bars and resist ice impact have higher requirements." Therefore, steel bars used in offshore concrete should also be specially protected. To
    this end, the Chinese Academy of Sciences Metals has developed a high-performance coating rebar technology, and through the Chinese Corrosion Society organization's identification, its performance exceeds the existing domestic and foreign relevant coating rebar technical indicators, in similar products in the international leading level. Through experimental research and durability analysis of high-performance epoxy-coated rebar technical indicators, metal institutes are expected to be used to design marine reinforced concrete structure engineering with a life of 120 years.
    It is understood that the total amount of anti-corrosion coating works of the Hong Kong-Zhuhai-Macao Bridge is about 1.51 million m2, each time the equivalent of coating 3600 basketball courts, need to be painted 5 times, the equivalent of 1400m2 per day.
    Extreme Challenge 64 innovative technologies
    The Hong Kong-Zhuhai-Macao Bridge Island Tunnel Project is in a sense a miracle in architectural history: the part that needs to be tested and the boundaries needed to be pushed over accounts for half of the total project; In the end, the Hong Kong-Zhuhai-Macao Bridge achieved 64 innovative technologies.
    extreme challenge! Sixty-four innovative technologies have helped the Hong Kong-Zhuhai-Macao Bridge break through the bridge's "100-year practice
    world-class difficulty: man-made permafrost tunneling under silt geology
    The Arch North Tunnel is known as the world's most difficult tunnel project, especially the dark section, although the length is only 255 meters, two or three minutes can walk the full course, but it has set a number of new records. The geological structure of the Arch North Tunnel belongs to the typical land, sea and land interaction sedimentary formation in the Pearl River Delta region, which is simply to dig a tunnel in a piece of sand and mud. In order to solve this problem, engineers use freezing technology to artificial permafrost layer to achieve basic construction. In order to achieve the basic conditions of construction, engineers used 36 diameter 1.62 meters, 255 meters long, with freezing function of special steel pipes to build a tunnel structure, the water-rich geological soil layer artificially into a permafrost layer with construction conditions.
    33 sink pipes connect dripping
    According to the design, the Hong Kong-Zhuhai-Macao Bridge undersea sink pipe tunnel consists of 33 giant sink pipes, each pipe length 180 meters long, 37.95 meters wide, 11.4 meters high, a single section weighing about 80,000 tons. The pipes were pre-made using factory methods, and for this reason, the bridge builders built the world's largest sink prefabri fabrication plant on the outer desert island in 14 months, setting a world miracle of pouring millions of squares of concrete without a crack. Even worldwide, there is no record of 100% leakage in sink tunnels. However, for the first time in a similar institution around the world, the Hong Kong-Zhuhai-Macao Bridge Tunnel has not leaked.
    E15 pipe section "three back drag twice installation
    due to the tunnel base tank sediment back silt problem, E15 pipe section has twice failed to sink pipe installation. However, it is this "accident" that provides the opportunity for innovation, which breeds the innovation of sediment back silt forecasting. Under the escort of innovative means, on March 24, 2015, the floating fleet took the E15 sink pipe out to sea for the third time, after several rounds of observation and adjustment, the E15 sink pipe in more than 40 meters deep seafloor and E14 sink pipe precise docking.
    the history of semi-rigid sink structure
    in the history of human engineering, there are only two methods of rigidity and flexibility in pipe production. But experts believe that either option has some problems with the Hong Kong-Zhuhai-Macao Bridge Tunnel. Therefore, the design team creatively introduced the new concept of semi-rigid structure, from the structure of a different way to solve the deep buried pipe to find a way out.re-installation of the final connector
    The maximum lateral deviation of the cross-over measurement data obtained after the lifting of the final joint of the sinking pipe tunnel of the Hong Kong-Zhuhai-Macao Bridge was 17 cm. Engineers took more than 27 hours to reverse the operation - to lift the final joint again and prepare for a second sinking, finally making the risk invisible. The north-south lateral deviation of the final joint is only 2.5 mm, which is 66 times more accurate than the first sinking docking.
    extreme challenge! Sixty-four innovative technologies have helped the Hong Kong-Zhuhai-Macao Bridge break through the bridge's "100-year practice
    the Hong Kong-Zhuhai-Macao Bridge spans the ocean, connecting Hong Kong to the east and Zhuhai and Macau to the west, with a total length of about 55 km. From research, design, construction to the final near completion, the Hong Kong-Zhuhai-Macao Bridge has gone through decades of long years. China's engineers down-to-earth, the courage to innovate, and constantly challenge to make this super-project completed, let the world's attention!
    This article is an English version of an article which is originally in the Chinese language on echemi.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to service@echemi.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

    Contact Us

    The source of this page with content of products and services is from Internet, which doesn't represent ECHEMI's opinion. If you have any queries, please write to service@echemi.com. It will be replied within 5 days.

    Moreover, if you find any instances of plagiarism from the page, please send email to service@echemi.com with relevant evidence.