The Shenzhen-Zhongshan Corridor was completed and opened: creating a number of world's largest gatherings of Tongji strength

Chinanews.com, Shanghai News, June 30 (Xu Jing) The Shenzhen-Zhongshan cross-river passage (referred to as the "Shenzhen-Zhongshan Passage") was completed and opened on the 30th, and it was opened to traffic for trial operation at 3 p.m. The Shenzhen-Zhongshan Corridor is another super-large traffic project built in the Guangdong-Hong Kong-Macao Greater Bay Area after the Hong Kong-Zhuhai-Macao Bridge, and is the world's first cross-sea cluster project integrating "bridges, islands, tunnels and underwater interconnection", overcoming a number of world-class technical problems and creating a number of world records. After the opening of the road, the driving time between Shenzhen and Zhongshan has been shortened from about 2 hours to 30 minutes. The construction of this major national project is full of the hard work and sweat of countless builders, and it also condenses the professional wisdom and hard work of many Tongji people.

From the project construction commander, to the director and chief engineer of the management center, and then to the director of the chief engineer's office, a group of outstanding alumni of Tongji University have taken the lead and bravely shouldered heavy responsibilities, playing a key role in key positions in major projects of the Shenzhen-Zhongshan Corridor.

Liu Jian, former director of the Chief Engineer's Office of the Shenzhen-Zhongshan Channel Management Center, is an alumnus of the 1999 bachelor's degree and the 2002 master's degree. After graduating from Tongji University, Liu Jian went to the United States to pursue a Ph.D., and after graduation, he joined an American company with a high reputation in the industry. In 2010, after learning about the Shenzhen-Zhongshan Corridor project, Liu Jian resigned from all positions in the U.S. company and resolutely returned to China. In order to demonstrate the necessity and feasibility of the Shenzhen-Zhongshan Corridor project, Liu Jian led a young technical team to travel 70 kilometers on both sides of the Pearl River, inspected, discussed and formulated 29 plans on the spot. At the end of 2015, the National Development and Reform Commission approved the project. In every construction link of the Shenzhong Channel, you can see the selfless work of the young commandos led by him. Not long ago, he was entrusted with the important task of the reconstruction and expansion project of the Humen Bridge.

In addition, a number of Tongji alumni have shouldered important responsibilities and missions such as project designers, project leaders, structural design leaders, and construction monitoring leaders of the Shenzhen-Zhongshan Corridor, contributing wisdom and strength to the construction of the Shenzhen-Zhongshan Corridor. In the design, scientific research, construction, supervision, testing, management and other aspects of the Shenzhen-Zhongshan Channel, there are the imprints of alumni of Tongji majors.

A number of professors from Tongji University took the initiative to give full play to their disciplinary advantages and academic accumulation, and worked hard to tackle a series of key technical problems in the Shenzhen-Zhongshan Corridor Project, providing strong scientific and technological support for the design, construction, operation and maintenance of the project.

It is the top priority to prevent risks, build a strong line of defense, and ensure the safety of the construction of major projects in the Shenzhen-Zhongshan Corridor. Li Yongsheng, Xie Xiongyao, Hu Qunfang, Xiao Rucheng and Ma Xianfeng's team took the lead in organizing the "Overall Safety Risk Assessment of the Engineering Plan of the Shenzhen-Zhongshan Corridor Project", which divided the evaluation unit according to the construction conditions, structural plan, construction technology and operation management of the project, considered the risk level of tunnels, bridges and artificial islands during the construction and operation periods, realized the quantitative assessment of the overall risk level of different route schemes, and provided technical support for the final line selection and engineering scheme of the Shenzhen-Zhongshan Corridor. In the construction stage, the "Site Selection and Construction Risk Assessment of the Floating Transportation Scheme of the Immersed Tube Prefabrication Yard of the Shenzhen-Zhongshan Corridor" was carried out, which provided technical support for the final adoption of the integrated ship floating transportation scheme in the Shenzhen-Zhongshan Corridor. Yan Zhiguo's team assisted in the construction, operation and maintenance of the Shenzhen-Zhongshan Corridor in the fields of tunnel ventilation optimization and fire prevention and control technology. With the help of numerical simulation and field tests, an optimization scheme for the technical parameters of the jet fan shroud was proposed, which improved the ventilation performance of the jet fan group in the ultra-wide section tunnel of the deep and middle channel. Numerical simulation, indoor test and field test of the cooling protection capability of high-pressure water mist and its influence on flue gas diffusion were carried out systematically, which provided support for the working mode, control strategy and coupling linkage of high-pressure water mist device with other fire protection systems during the operation of the ultra-wide section tunnel of the Shenzhen-Zhongshan Corridor. Intelligent disaster prevention technologies such as dynamic reconstruction of fire disaster field and dynamic evacuation and rescue have been established, which provide technical support for the disaster prevention and rescue design of ultra-wide section tunnels in the Shenzhen-Zhongshan Corridor.

The immersed tunnel in the Shenzhong Passage adopts a steel-plate concrete composite structure with integral pipe sections, which is different from other segmented pipe section immersed tunnels such as the Hong Kong-Zhuhai-Macao Bridge, which brings new problems to earthquake resistance and fire resistance. Li Guoqiang's team and China Merchants Chongqing Transportation Research and Design Institute Co., Ltd. formed a consortium to jointly undertake and complete the project of "Research on Key Technology for Fire Prevention of Pipe Section Structure and Joints of Super-large Span Steel-shell Concrete Immersed Tunnel of Shenzhong Tunnel", completed the theoretical analysis and numerical simulation of fire protection measures for the main structure and joints of immersed tunnels, and tested and verified the reliability of the analysis methods and fire protection measures, providing technical support for the high-quality construction of the Shenzhong Tunnel project and ensuring fire safety during operation. Yu Haitao and others analyzed the seismic safety of steel-concrete composite integral pipe section immersed tunnels, proposed additional seismic effects caused by transverse inhomogeneity of ultra-wide immersed tunnels, and compiled the "Seismic Design Guidelines for Integral Steel-Concrete Composite Immersed Tunnels", which provided strong support for the design and construction of immersed tunnels.

Changhong lying wave, how to ensure that the super-large cross-sea bridge of the Shenzhen-Zhongshan Channel can withstand the test of super typhoon? In the face of the key technical problems of wind resistance of the Shenzhen-Zhongshan Corridor cross-sea bridge, the research group of Ge Yaojun and Zhao Lin of the wind engineering team developed the optimal aerodynamic layout of the super-large span offshore integral steel box girder suspension bridge, and formed comprehensive aerodynamic damping measures such as a high air permeability railing that can effectively reduce the load intensity of the incoming wind vortex, a maintenance track layout that weakens the vortex shedding, and a central stabilizing plate that slows down the development of the vortex, so as to meet the flutter stability of the wind speed of 88m/s (more than 17 typhoons), and ensure that the long-span suspension bridge of the Shenzhen-Zhongshan Corridor can be used in the design wind speed of ultra-high, The Lingdingyang sea area with frequent super typhoons is safe for wind resistance during the 100-year design period. Xiao Rucheng's team compared the parallel cable surface and space cable surface of the super-long span suspension bridge, focused on the performance of the space cable surface separated main girder bridge structure, and compared the performance difference with the conventional vertical cable surface suspension bridge.

The project team also planned a reasonable, feasible, simple and economical construction plan for the Lingding Main Channel Bridge of the Shenzhen-Zhongshan Corridor, and comprehensively evaluated the stress and stability of the bridge at all stages of construction to ensure the safety and reliability of the structure. This study provides a scientific basis for similar super-span bridge construction projects, and also contributes important theoretical and practical achievements to the field of international bridge engineering. In the face of the key seismic technical problems of the main bridge of the 1666m three-span full floating system suspension bridge and the main bridge of the Lingdingyang Bridge of the Shenzhong Channel, Yuan Wancheng's team determined the seismic fortification standard of the bridge design reference period, adopted the spatial nonlinear seismic time history analysis method of the bridge structure, focused on the mutual coupling effect, collision effect and longitudinal and transverse displacement constraints of the main approach bridge, comprehensively and systematically evaluated the seismic performance of the bridge, and studied and formulated reasonable seismic countermeasures to ensure the seismic safety of the bridge during its service period. (ENDS)

Editor: Xu Jing