The Hong Kong-Zhuhai-Macao Bridge is a super-large cross-sea passage connecting Hong Kong, Zhuhai and Macau. It has a total length of 55 kilometers and will become the longest sea-crossing bridge in the world. The main project “Haizhong Bridge Tunnel” is 35.578 kilometers long, of which the submarine tunnel is about 6.75 kilometers long. The total length of the bridge is 49,968 meters. The main project "Haizhong Bridge Tunnel" is 35,578 meters long, including the 5,664-meter subsea tunnel. The design life is 120 years. It can withstand the magnitude 8 earthquake and the 16-level typhoon. The Hong Kong-Zhuhai-Macao Bridge immersed tunnel is the world's longest road immersed tunnel and the only deep buried immersed tunnel in the world. The production and installation technology has a series of innovations, providing unique samples and valuable experience for the world's underwater tunnel engineering technology. On November 14, 2017, the main project load test of the Hong Kong-Zhuhai-Macao Bridge was completed and entered the acceptance period. On the New Year's Day of 2018, the main body of the Hong Kong-Zhuhai-Macao Bridge, the world's longest cross-sea bridge, is illuminated. It marks the opening of the bridge and is expected to be officially opened before July 1, 2018. Is it a little excited to see the heart inside? Uh huh, sit down, this is just an appetizer. The next grapefruit prince will take you to know other Chinese bridges. They are famous: Hutong Yangtze River Bridge, Dankun Bridge, Chaotianmen Bridge, Pingtan Strait Railroad Dual-purpose bridge, Sidu River Bridge, etc.
Route orientation: The Hong Kong-Zhuhai-Macao Bridge adopts the line plan from Shisan Bay to Gongbei Pearl. The main bridge starts from the east side of the Lantau Island in the New Territories Islands in Hong Kong. It is connected to the Hong Kong port and passes through the waters of Hong Kong along the north side of the 23DY anchorage. To the west, it passes through the Zhugukou Tonggu Channel, the West Yunnan Channel, the Qingzhou Waterway, and the Jiuzhou Waterway. It passes through the southeastern part of Gongbei Bay in Zhuhai and ends at the artificial island of Zhuhai Macau Port.
Research on the application of concrete polyurea protection technology of Hong Kong-Zhuhai-Macao Bridge: The Hong Kong-Zhuhai-Macao Bridge is located in the Bohai Sea area of ??the Pearl River Estuary, connecting Hong Kong, Macao and Zhuhai. The construction of the project mainly includes: the main body of the bridge and the immersed tunnel under the seabed. Soak in sea water. The sea area has a tropical maritime climate, sea water temperature and salt content are high, and the service environment is complex. The design life of the bridge is 120 years, and its durability has been receiving much attention. The spray polyurea elastomer technology has been successfully applied in engineering protection such as Beijing-Shanghai high-speed rail and Qingdao Jiaozhou Bay Bridge, and is considered to be one of the most effective methods for bridge concrete protection. The combination of the bridge and tunnel structure of the Hong Kong-Zhuhai-Macao Bridge and the complexity of its environmental conditions are a severe test of the performance and construction process of polyurea coatings. In this paper, the effects of temperature, humidity and acid-base salt soaking on the mechanical properties of polyurea coating and geotextile polyurea composite coating were studied under laboratory simulation conditions. The impermeability of different coating thicknesses on coated concrete The effect of frost resistance and the wear resistance of the coating. The conclusions of the study are as follows: (1) The effect of temperature on polyurea coating and geotextile polyurea composite coating shows that the coating has a stable mechanical property at 45 °C at -30 °C, at this time polyurea coating The tensile strength, elongation at break and tear strength are: 16.62 MPa, 449.49% and 77.69 N/mm, respectively. When the temperature is 25 ° C and the temperature is 50 ° C, the coatings are stable at 5d and 2d respectively. value. Under the three temperature curing conditions, the mechanical properties of the coating are higher than the actual engineering requirements. (2) The effect of humidity on polyurea coating and geotextile polyurea composite coating shows that when the temperature is 25 ° C and the humidity is 60%, the coating reaches a stable value of mechanical properties around the 6th day, with polyurea coating. For example, the tensile strength, elongation at break and tear strength are: 16.98 MPa, 481.27% and 78.31 N/mm, respectively; when the humidity is 80%, the elongation at break of the polyurea coating is: 509.51%. The results show that the elongation at break increases with the increase of humidity, and the mechanical properties can meet the actual engineering needs. (3) The polyurea coating was soaked in seawater, and the wear quality did not change significantly with the increase of soaking time. After soaking for 120 days, the abrasion quality of the coating was 0 after the stroke of the Acron wearer reached 1.61 km. 1102g, the experimental results show that the polyurea coating has good wear resistance and can meet the needs of practical engineering. (4) The mechanical properties of polyurea coating and geotextile polyurea composite coating under different conditions of corrosive medium immersion have been reduced to varying degrees. After immersing in three corrosive media, the mechanical properties change trend is almost the same, although it has decreased, but still maintained at a high level, to meet the needs of actual engineering.
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