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Xi Jinping sent a letter to congratulate the completion and opening of the Shenzhen-Zhongshan cross-river passageThe Shenzhen-Zhongshan cross-river passage was completed and opened on June 30.Xi Jinping, General Secretary of the CPC Central Committee, President of the State, and Chairman of the Central Military Commission, sent a congratulatory letter to express warm congratulations and extend sincere greetings to all comrades involved in the planning and construction.Xi Jinping pointed out that the Shenzhen-Zhongshan Corridor is another super-large transportation project built in the Guangdong-Hong Kong-Macao Greater Bay Area after the Hong Kong-Zhuhai-Macao Bridge. It has overcome a number of world-class technical problems and set a number of world records.All participants completed the project tasks with high quality through hard work, perseverance and high quality.This fully proves that Chinese-style modernization is achieved through hard work, and great undertakings are achieved through hard work.Xi Jinping emphasized that in the next step, we must make good use of the Shenzhen-Zhongshan Corridor to ensure safe, smooth, comfortable and smart operation, give full play to the pioneering role of transportation, promote the integrated development of the east and west sides of the Pearl River Estuary, and improve the infrastructure of the Guangdong-Hong Kong-Macao Greater Bay Area.The level of "hard connectivity" and "soft connectivity" of rules and mechanisms will promote the market integration of the Guangdong-Hong Kong-Macao Greater Bay Area and provide better service guarantees for building the Guangdong-Hong Kong-Macao Greater Bay Area into a strategic fulcrum of a new development pattern, a demonstration site for high-quality development, and a leading place for Chinese-style modernization.On the morning of the 30th, the opening event of the Shenzhen-Zhongshan Channel was held on the West Artificial Island.Huang Kunming, member of the Political Bureau of the CPC Central Committee and Secretary of the Guangdong Provincial Party Committee, read Xi Jinping鈥檚 congratulatory letter on the spot and announced the opening of the Shenzhen-China Channel.A subsidiary of China Railway Group CorporationChina Railway Bridge Institute and China Railway Sixth InstituteParticipated in the design and supervision of the Shenzhen-Zhongshan TunnelChina Railway Bridge Bureau, China Railway Tunnel Bureau, and China Railway IndustryParticipated in the specific constructionIt took 7 years to buildThisBehind the super projectWhat super "wisdom" is containedLet's take a look with the editorThe Shenzhen-Zhongshan Corridor is a world-class cross-sea cluster project that integrates bridges, islands, tunnels and underwater interconnections. It has set ten world records and is currently one of the most difficult cross-sea cluster projects in the world to construct.It is about 30 kilometers away from the Humen Bridge in the north and 31 kilometers away from the Hong Kong-Zhuhai-Macao Bridge in the south. It starts from the Shenzhen Airport Interchange, crosses the Lingdingyang Sea to the west, connects to the Nanzhong Expressway through the Wanqingsha Interchange, and lands on Ma'an Island in Zhongshan City to connect with the China Kaili Expressway.After it is put into operation, it will only take half an hour to drive from Shenzhen to Zhongshan.Series Underwater InterconnectionThe China Railway Tunnel Bureau undertook the construction of the east artificial island of the Shenzhen-Zhongshan Tunnel. The island has a land area of 鈥嬧€?43,800 square meters, equivalent to 48 international standard football fields. The island is equipped with tunnel projects, rescue docks, power supply and distribution supporting buildings and related ancillary facilities.Among them, the tunnel project includes a 480-meter-long weir section tunnel, an 855-meter-long island main line tunnel, and four ramp tunnels for traffic conversion.On December 21, 2017, the construction of the East Artificial Island officially started. After more than 2,000 days of overcoming difficulties, the China Railway Tunnel Bureau construction team has successively overcome the problems of anti-seepage, water-stopping and even backfill control during the construction phase of the deep soft foundation, ultra-deep and ultra-wide foundation pit cluster project in the sea area, and solved the world problem of small deformation of structures close to deep foundation pit construction.As the first underwater highway interchange in China, the East Artificial Island adopts a "one body and two wings" layout to connect with the submarine immersed tube tunnel and achieve efficient and smooth connection between the project and the Guangzhou-Shenzhen Coastal Expressway and other road networks.Erecting a Flying Rainbow on the SeaThe non-navigable bridge in the offshore section of the Shenzhen-Zhongshan Channel is about 11.4 kilometers long. A total of 138 steel box girders and 155 concrete girders need to be erected. The scale is large and the quality requirements are high.China Railway Bridge Bureau undertakes the task of "manufacturing and transporting frames" for these bridges.The transportation lines for box girder erection in deep and medium passages are long and there are many crossing channels. Moreover, beam taking, transporting, moving and erecting all require specific tide levels for construction. Construction organization and coordination are difficult and safety risks are high.In order to successfully complete the construction tasks, China Railway Bridge Bureau has built the "Smart Beam Field" of the Shenzhen-Zhongshan Corridor, fully implementing the construction concepts of automatic intelligence, factoryization and assembly, applying Internet of Things+, BIM and information technology to realize formwork automation, steel bar componentization and intelligent concrete production, creating the most advanced beam field in China.During the beam erection construction, China Railway Bridge Bureau adopted the independently developed "Tianyi", the first domestically developed single-hull ship-shaped structure and fully electric propulsion special crane ship for offshore girder erection construction. The maximum lifting weight is 3,600 tons. It can independently complete the work of taking, transporting and erecting beams without the need for auxiliary ships.There are many types of offshore box girders in the Shenzhen-Zhongshan Channel, with a lifting height of 64 meters. The girder erection spreader of "Tian No. 1" is required to be suitable for 5 types of box girders. China Railway Bridge Bureau designed and manufactured a 550-ton spreader through various design verifications, which not only saved materials and labor during construction, but also accelerated the construction progress.Building intelligent production lines China Railway Shanqiao and China Railway Baoqiao, both affiliated to China Railway Industry, undertook the manufacturing tasks of steel box girders in the G05 contract section and G04 contract section of the Shenzhen-Zhongshan Tunnel, including the Lingdingyang Bridge steel boxLiang, Zhongshan Bridge, non-navigable hole bridge in Hengmen flood discharge area, non-navigation hole bridge in west flood discharge area, non-navigation hole bridge in shoal area, Wanqingsha interchange ramp bridge and ancillary facilities, with a total length of 7.24 kilometers, and a total steel structure weight of approximately 183,000 tons.China Railway Industry has researched and applied "key technologies for intelligent manufacturing of bridge and tunnel steel structures in cross-sea cluster projects" and created a "four lines and one system" intelligent equipment cluster with the core of intelligent plate blanking and cutting production lines, intelligent panel unit welding production lines, segmented intelligent assembly production lines, intelligent steel box girder coating production lines, and workshop manufacturing execution intelligent management and control systems, realizing automation, informatization, networking, and digital management and control of the manufacturing workshop production process.This achievement won the 2023 China Steel Structure Association Science and Technology Special Award.The bridge deck of the Lingdingyang Bridge in the Shenzhen-Zhongshan Channel is 91 meters above the sea. It is currently the sea bridge with the highest navigation clearance in the world.During the construction of the bridge, the China Railway Industry project team used the breakthrough point of solving industry problems such as fatigue damage of steel box girder orthotropic bridge decks, and developed the U-rib double-sided submerged arc full penetration welding process for orthotropic bridge decks. It achieved full penetration, defect-free, and detectable U-rib welding, with a one-time inspection pass rate of more than 99%. Compared with traditional processes, it greatly improved the fatigue resistance of the steel bridge deck and ensured the quality stability of the steel bridge deck.Provide technical supportChina Railway Bridge Institute participated in the entire process of cross-sea bridge program research, surveyed and designed 6.8 kilometers of bridge projects including the 1,170-meter-long Zhongshan Bridge, and provided construction supervision for complex projects such as the world's first two-way eight-lane steel shell concrete immersed tunnel, the world's first fully underwater hub interchange - Shenzhen Airport Interchange, and east and west artificial islands.Zhongshan Bridge is one of the key projects of this project, with a main span of 580 meters, two-way 8 lanes, and a total width of 46 meters.There are two main towers in the east and west. The standard steel box girder section is 18 meters long and weighs 428 tons. The area of 鈥嬧€媋 single standard steel box girder section is equivalent to the area of 鈥嬧€? international basketball courts, and its weight is equivalent to the weight of 300 cars.The design team of the China Railway Bridge Institute innovatively adopted technologies such as "ultra-wide steel box girder design", "ultra-wide steel box girder erection", "cable-stayed cable pre-tensioning and staged main beam welding", and successfully solved the technical problems of large deformation in main girder erection and small space for cable-stayed cable tensioning, ensuring the smooth closing of the Zhongshan Bridge and providing theoretical and engineering reference experience for other similar ultra-wide steel box girder erection construction in the future.The 6,845-meter-long deep-to-medium-passage submarine immersed tunnel participated by the China Railway Sixth Institute is the world's first extra-long two-way eight-lane submarine immersed tunnel. It was rated as one of the "50 landmark projects in the field of global tunnels and underground engineering" by the International Tunneling Association.The design team of the China Railway Sixth Institute began tunnel consultation and review work in 2016 to gain an in-depth understanding of the project requirements, clarify the key elements of the design, establish a strict quality control process, and promptly handle various technical issues during the project advancement process.Later, we overcame technical difficulties such as the world's first two-way eight-lane ultra-wide cross-section immersed tube tunnel, long-distance safe floating and seabed subsidence, and ultra-wide and ultra-deep cut-and-cover tunnels that penetrated existing operating highway bridges along the river at ultra-close distances, effectively ensuring the smooth completion of the main line project of the Shenzhen-Zhongshan Channel.As the only direct highway connection between the Shenzhen-Dongguan-Huizhou and Zhuzhongjiang urban agglomerationsShenzhen-Zhong PassageShenzhen-Zhong Passage is the Pearl River EstuaryThe skeleton of the A-shaped transportation network"The key cross"After the opening of Shenzhen-Zhong PassageThe drive between Shenzhen and Zhongshanshortened from two hours to less than half an hourIn the future, it will only take 15 minutes from Guangzhou Nansha to ZhongshanZhuhai and Jiangmen to Shenzhenshortened from more than 2 hours to less than 1 hourCreating a new pattern of transportation development in the Bay Area