Construction determines design-due to the specific natural conditions such as wind, waves, tides and currents in Hangzhou Bay, the construction scheme of the bridge determines the design scheme.
High-tech-adopt world-advanced anti-corrosion technology for seawater corrosion; In view of the harsh construction environment, high-tech new technologies and methods such as integral erection and installation of large prefabricated components are adopted.
The construction management system is complex-in order to ensure the safety of offshore construction and the traffic and structural safety during operation, the bridge will establish advanced integrated management systems such as structural health and safety monitoring and early warning and emergency rescue systems, and will be built into a real digital bridge.
Hangzhou Bay Bridge is a convenient passage for shenyang-haikou expressway, the national trunk line, to cross Hangzhou Bay. The bridge starts from Zhengjiadai, Haiyan, Jiaxing in the north, crosses the wide Hangzhou Bay and ends at Shuilu Bay, Cixi, Ningbo, with a total length of 36 kilometers. It is the longest sea-crossing bridge built and under construction in the world at present, and the land distance between Ningbo and Shanghai will be shortened by120km after completion. The bridge has two channels, the south and the north. Among them, the north channel bridge is a rhombic steel box girder cable-stayed bridge with double towers and double cable planes with a main span of 448 meters, with a navigation standard of 35,000 tons. Nanhang Road Bridge is a type A steel box girder cable-stayed bridge with single tower and double cable planes, with a main span of 3 18m and a navigation standard of 3,000 tons. Except for the North-South Waterway Bridge, the other approach bridges all adopt prestressed concrete continuous box girder structures ranging from 30 to 80 meters. The bridge is designed as a two-way six-lane expressway with a design speed of 100km/h, a design service life of 100 years, and an estimated total investment of about11800 million yuan. The bridge project started construction on June 26, 2007, passed the handover acceptance in April 2008, and was completed and opened to traffic in May 2008.
Hangzhou Bay Bridge is a super-large traffic infrastructure designed, managed, constructed and invested by China. The fifth meeting of the technical expert group of Zhejiang Province and the Ministry of Communications spoke highly of the Hangzhou Bay Bridge project, pointing out that the bridge project has achieved a number of technological innovations with independent intellectual property rights, which is a landmark project of the latest technological achievements in the construction of the cross-sea bridge in China, a milestone in the construction of the Gulf Bridge in China, a super-large bridge project successfully built in China with the world advanced level, and has enhanced China's position in the field of international civil engineering.
The completion and opening of the bridge is conducive to actively docking with Shanghai, expanding opening up, promoting cooperation and exchanges in the Yangtze River Delta region, improving the opening up level of Zhejiang Province, especially Ningbo and Jiaxing, and enhancing its comprehensive strength and international competitiveness; It is conducive to improving the layout of the regional highway network and national trunk lines in the Yangtze River Delta and alleviating the traffic pressure on the Shanghai-Hangzhou-Ningbo Expressway. It is conducive to changing the situation of Ningbo's transportation hub, thus becoming a transportation hub and implementing the regional development strategy around Hangzhou Bay; It is conducive to promoting the development of Jiangsu, Zhejiang and Shanghai tourism.
In the construction of bridge engineering, unprecedented difficulties have been encountered, including: first, the construction conditions are very bad, with many typhoons, large tidal range, rapid tidal current, deep scouring, wide beach, strong corrosiveness and shallow gas, and the effective working days in one year are about 180 days; Second, the domestic cross-sea bridge construction lacks ready-made technical specifications; Third, lack of experience in the construction and management of long bridges across the sea; Fourth, there is a lack of construction equipment for building long bridges across the sea; Fifth, the bridge is huge, with a total of 2.45 million cubic meters of concrete, 800,000 tons of steel and 9,063 piles of various types. There are many construction ships, many operation points and long engineering front. Sixth, it is necessary to raise more than 654.38+0 billion construction funds by itself. The construction process of Hangzhou Bay Bridge is a process of continuous innovation, which is the crystallization of all builders' innovations in concept, technology and management. It can be said that without innovation, there would be no Hangzhou Bay Bridge.
The first is concept innovation. Starting from the concrete reality of Hangzhou Bay, bridge builders have developed the idea of bridge construction, established the idea of "design depends on construction", "industrialization, large-scale and mechanization, and changed offshore construction into onshore construction", and put forward the construction goal of "bridge design service life 100 year" for the first time in China. Actively explore innovative investment and financing mechanisms and encourage private capital to invest in super-large national infrastructure projects. At present, private capital accounts for 28.64% of the total investment of the bridge.
Second, technological innovation. The bridge construction always insists on respecting science, relying on experts, and giving full play to the "think tank" role of the technical expert group of Zhejiang Province and the Ministry of Communications. From 1994, a special study of 148 was conducted. Up to now, 6 patented technologies and 9 ministerial-level construction methods have been approved, and 8 scientific and technological achievements have won provincial awards. Some technical specifications and procedures have been incorporated into the new specifications of National Standards Committee, Ministry of Communications, Ministry of Railways and china civil engineering society, and 8 patented technologies and 4 national construction methods are being declared. Since the start of construction, more than 250 technological innovations have been carried out, and independent innovation achievements, represented by nine core technologies, have been achieved, and the technical problems of building a sea-crossing bridge in a strong tidal bay have been overcome. At present, six key technologies have passed the national appraisal, and the overall results have reached the international leading level. The third is management innovation. In the management system, the headquarters has changed the traditional management mode of the director's office, and the owners have assumed most of the responsibilities of the director's office, replacing indirect management with direct management, and comprehensively strengthening the work of "four controls, two pipes and one coordination"; In terms of management mechanism, modern management concepts such as scientific management, fine management and civilized management have been established, and modern management science such as working procedures, management informationization, skill standardization, reward and punishment contracting and operation marketization have been fully implemented.
Through three innovations, the bridge project has made remarkable achievements in quality, safety and progress. In terms of quality management, there was no quality grade accident, which was among the best in the provincial quality cost law enforcement inspection organized by Zhejiang Provincial Communications Department over the years and was well received by the Ministry of Communications. In terms of safety production, the bridge project has withstood the severe test of severe conditions such as 19 typhoon, astronomical tide and shallow methane, and no serious injury or above safety accident occurred in the construction of the project. On the progress of the project, it took only three years and seven months to realize the whole bridge, and the whole line was opened to traffic eight months ahead of schedule.
At present, five construction units in the whole bridge have won the National May 1 Labor Award, 10 builders have won the National May 1 Labor Medal, and 198 collectives and 433 people have won the honorary commendation of the provincial, municipal and meritorious competition organizing committees. In 2004 and 2005, Hangzhou Bay Bridge Engineering Headquarters won the title of "Top Ten Bridge Construction Heroes in China's Traffic Construction" in the first National Bridge Culture Week in 2006 and the title of "Top Ten Bridge Construction Heroes in China's Traffic Construction" in 2007. In 2006, the Party Committee of Hangzhou Bay Bridge Project Headquarters won the honorary title of National Advanced Grass-roots Party Organization.