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If Hong Kong Zhuhai Macao Bridge is compared to a dragon waiting to be married, then thousands of professional "beauticians" are responsible for its "red lips, black eyebrows and rosy clouds". The ultimate goal of the anti-corrosion coating project of Hong Kong Zhuhai Macao Bridge is to make the Jiaolong marry beautifully, and the beauty is amazing and lasting.

Cut the dress according to one's figure

According to the experimental research, the annual corrosion rate of ordinary carbon steel actually reaches 0.3-0.4mm/year through the data measured by the corrosion probe. When the second hand on the watch turns a circle and a half, a ton of steel in the world is corroded into rust.

According to the statistics of the research group of "China's corrosion situation and control strategy", the economic loss of natural disasters in 2014 was 337.38 billion yuan, while the loss caused by corrosion was about 2 trillion yuan, accounting for 3% of the GDP of that year. "Corrosion is several times the total loss caused by various natural disasters, and corrosion has become one of the important factors affecting the sustainable development of national economy and society," said academician Hou Baorong, head of the research group and director of the corrosion center of the Institute of Oceanography, Chinese Academy of Sciences

Hong Kong Zhuhai Macao Bridge is located in the Lingdingyang sea area outside the Pearl River Estuary of Guangdong Province, which belongs to the subtropical marine climate. According to iso12944-2 corrosion protection coating system for Steel Structures Part 2: environmental classification, the atmospheric corrosion environment of Hong Kong Zhuhai Macao Bridge project is the coastal and offshore areas with high salinity, belonging to the c5-m type with the highest corrosion level. In view of this environment, the long-term heavy anti-corrosion system is adopted for the coating of Hong Kong Zhuhai Macao Bridge (see the table below).

Painstaking effort

Course review

The superstructure of Hong Kong Zhuhai Macao Bridge project has a total steel consumption of 420000 tons, and the cb01 bid is responsible for 180000 tons, which is equivalent to the construction of 45 Tokyo towers in Japan and two golden gate bridges in the United States, while the total amount of super "wedding clothes" contracted by Shanghai Construction and metallurgy company is about 1510000 m2, which is equivalent to the area of the capital of Maldives, male. Each painting is equivalent to 3600 tons Four basketball courts, three years, 1400m2 per day to be painted five times.

CCTV once reported three difficulties of Hong Kong Zhuhai Macao Bridge - corrosion prevention, wind prevention and earthquake prevention. The difficulty of making this super "wedding dress" mainly lies in its large-scale project, complex anti-corrosion conditions, high technical and environmental protection requirements. Therefore, she was rated as "one of the most complicated projects with the highest construction requirements and standards in the history of China's transportation".

"Craftsman" spirit

How to finish the super "wedding dress" with limited time and quality? All simplicity comes from the control of complexity. Hong Kong Zhuhai Macao Bridge puts forward the quality management policy of "technical innovation, scientific management, careful construction, strict control and construction of world top-quality projects". With the help, supervision and guidance of the owners, supervisors, general contractors and other parties of the bridge, we are committed to the spirit of "craftsman" and vow to build the bridge into a bright project and top-quality project that is both "pleasing to the eyes" and "enjoyable to the heart".

All personnel participating in the anti-corrosion coating construction of Hong Kong Zhuhai Macao Bridge have received pre job training and technical disclosure, and through experimental operation, post skills, specifications and other education and training, so that the construction personnel can master the technical specifications, the construction process and the site emergency construction accidents, and they can work with certificates after passing the assessment.

Environmental requirements for painting of Hong Kong Zhuhai Macao Bridge: the relative humidity of the air in the painting room is ≤ 80%, the temperature is 5 ℃ ~ 38 ℃, and the surface temperature of the steel plate is higher than the dew point temperature by more than 3 ℃. Therefore, the painting room is equipped with a heating and dehumidification system and a temperature and humidity detection instrument to effectively ensure that the construction environment is basically kept in a constant temperature and humidity state.

After the construction materials enter the site, first check the name, quantity, specification, etc., and then check the factory quality certificate. Each batch of materials can only be put into storage for use after passing the factory re inspection and the approval of the supervising engineer.

Material sampling and sample sending shall be reported to the general contractor and the supervising engineer for inspection and carried out under their supervision. After the test is qualified, the quality certificate, test report and other supporting documents shall be submitted to the supervising engineer for approval. "One bolt, one square meter area" is the principle for quality inspectors to inspect each process, and it is also the requirement of "zero tolerance" for anticorrosive coating process control of Hong Kong Zhuhai Macao Bridge.

The main anti-corrosion coating procedures of Hong Kong Zhuhai Macao Bridge are surface cleaning, sand blasting and rust removal, and coating spraying. Each process inspection shall be strictly controlled in accordance with the principle of "three press, three don't let go", and strictly comply with the requirements of "three inspection" procedure.

Technology decoration

Hong Kong Zhuhai Macao Bridge puts forward the manufacturing concept of "large scale, industrialization, automation and informatization", uses a large number of "high, large and superior" transformer like automatic anti-corrosion equipment, changes the traditional "silly, large and stupid" machines and "human sea tactics", and promotes the anti-corrosion industry to move towards modernization with energy conservation, efficiency and environmental protection.

Using the double cylinder four gun continuous sand blasting machine, one tank with four guns achieves high efficiency, remote control sand loading saves time, dust-free and environmental protection, it completely subverts the traditional configuration of one cylinder, one gun and one person, and more excellently lays a solid foundation for the completion of sand blasting and derusting work with high quality and quantity, and the precision equipment is worthy of the expectation.

The steel sand recovery system is like a robot. As soon as you press the start key, the steel sand in the sand pit will be automatically sucked into the bucket elevator, and then into the dust ball separator. The abrasives screened and separated by the separator will enter the sand storage box. The abrasives entering the sand storage box will be distributed to the sand tank by self flowing abrasives, forming a huge automatic system with the sand tank, ensuring the recycling of abrasives, saving and high efficiency Construction progress.

Green anticorrosion