ganu Bridge renderings
Technology and innovation is productivity, the country relies on it for its prosperity, and engineering relies on it for its strength. Since the construction of the Longmen Bridge (hereinafter referred to as the Longmen Bridge) on National Highway 228 Dandong to Dongxing Guangxi Binhai Highway, the Longmen Bridge project has adhered to the innovation-driven . In view of the conditions and project characteristics of the bridge, it has actively carried out technical research in terms of design innovation, scientific and technological innovation, green innovation, etc., and took the construction of the " quality project " as a starting point to improve the durability and safety level of the project and promote the coordinated development of the project construction. In 2020 and 2021, the Longmen Bridge project was listed by the Ministry of Transport as a pilot project of "Strong Transportation Country and Science and Technology Promotion" and the first batch of "Safe Centennial Quality Project" demonstration project ; in July this year, the project was rated as a typical case of transportation innovation in 2022 Guangxi.
Design innovation Construction of high-quality
From a distance, the two main towers of Longmen Bridge stand high on both sides of the two sides of the Maoweihai , with a magnificent momentum. On May 20 this year, the 174-meter-high main tower of the Longmen Bridge was successfully topped off; on July 20, the beams on the main tower of the bridge were successfully cast, and the construction of the main tower of the bridge was basically completed... Now, the loose cable saddle and main cable saddle of the Longmen Bridge have been installed, the pilot cable has crossed the sea, and the main bridge has fully entered the superstructure construction stage.
On July 20, 2022, the beam on the main tower of Longmen Bridge was poured.
"The main tower of the Longmen Bridge has canceled the middle beam, which is also a first of the same type of bridges in the industry." Jia Liqiang, commander of the Longmen Dafengjiang Bridge project command, introduced that by optimizing the main tower structure, the Longmen Bridge eliminates the middle beams with complex stress, cumbersome construction technology, and prone to cracking in the later operation. For the first time, a full floating structure system is adopted in a single-span suspended kilometer-level suspension bridge, effectively reducing the angular displacement of the lower end of the live load, and improving the safety and landscape effect of the bridge.
This is a case of many design innovations in Gantry Bridge. Since the start of construction of the bridge, the Longmen Bridge project has always implemented innovative design concepts, boldly innovated design plans, and eliminated weak links in the quality of the engineering structure.
"Design is the leader in engineering construction and plays a leading role in the full life cycle and intrinsic safety of the project." Jia Liqiang said.
During the construction process, the Gantry Bridge project continuously summarized the construction experience of the same type of cross-sea super-large span suspension bridge at home and abroad, actively carried out a series of design innovations, and ensured high-quality construction of the project from the source through the application of various design measures.
It is worth mentioning that the project has innovatively adopted the circular-moment blocking pile enclosure structure of "3.5-meter large-diameter pile + second-phase groove" for the first time in the construction of anchor foundation. The large-diameter pile and the anchor foundation core fill jointly participate in the stress relief, greatly reducing the scale of anchorage, improving the safety reserve of anchorage stress, improving the durability of the structure, and effectively reducing the cost of anchorage construction and shortening the construction period;
Gantry Bridge anchor core filling pouring site.
adopts the third generation steel box girder model design, optimizes the section structure of steel box girder, form, and maintenance vehicle track position, and innovatively adopts inverted L-shaped flow deflectors to effectively improve the aerodynamic performance of and improve the overall wind resistance of the bridge;
adopts new "S-shaped steel wire + dry air dehumidification" protection measures and full-life cycle full-bridge dehumidification system, effectively improves the efficiency of dehumidification management of the whole bridge, reduces the workload of later operation and maintenance, and improves the efficiency of the bridge's full-life cycle.
Technology innovation Intelligent manufacturing upgrade
gantry bridge renderings.The construction management center of the construction and management center of the on-site monitoring and intelligent scheduling of the Gantry Bridge project not only contains the project's construction culture and concepts, but also brings together project technological innovation and intelligent crystallization. The project construction management center deeply integrates more than 20 intelligent sections, including safety and quality management, smart safety helmets, AI safety hazard identification system, BIM technology, vehicle scheduling management system, trest automation monitoring system, intelligent early warning nut system, smart electricity safety monitoring system, etc., to realize the visualization, digitalization and informatization of project construction management, and improve the level of refined management and control of project construction. This is just a microcosm of the establishment of a technological innovation research mechanism for in-depth collaboration between industry, education, research and application of the Gantry Bridge project, focusing on the safety, durability and quality of engineering construction, and carrying out in-depth technological innovation.
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Actively carry out scientific and technological research and development has always been the key direction of the Longmen Bridge project. The Longmen Bridge Project Command, in conjunction with many famous domestic scientific research institutions, carried out scientific and technological research on the structural system, wind resistance and stability, structural durability of the oversea super-span suspension bridge in the Beibu Gulf region, carried out scientific and technological research on "Extra-large span suspension bridge constraint system, wind resistance, anchor design and construction technology innovation and demonstration" in response to key technical issues such as the structural system, wind resistance, and anchor design and construction of Beibu Gulf region. It successfully established the 2021 Guangxi Key R&D Plan Project. It has completed the acceptance of the mid-term results and applied to project construction. At the same time, it has formed a series of intellectual property rights such as papers, patents, and software copyrights.
In addition, the Gantry Bridge project actively carried out construction technology research during the construction process, applied 33 "four new technologies" and carried out 32 micro-innovation technologies to form a number of excellent construction technologies that can be promoted and referenced, including the key construction technology of cable towers in marine environments, large-size round-moment block pile construction technology, ultra-large volume concrete one-time continuous casting technology, small curve radius double-span bridge cast-in-place box girders mobile form frame key construction technology, etc. Among them, the concrete of the east and west anchor core filling in the Longmen Bridge was poured continuously at one time by 47,000 cubic meters and 58,600 cubic meters, breaking the world record of the largest continuous pouring volume in the history of the construction of sea-middle bridges.
green development Guard the ecology
Langmen Bridge construction and mangrove live in harmony.
"The sails sailed down the mountain and thought they were gone, the sky was low and the waves were about to swallow; the breeze blew the moon, and the sun was clear on the distance." This is the vivid description of the seventy-two Jings of Qinzhou Port Longmen. The mangrove forests are spread across the 72 Jing range, which has always been a major challenge and problem in project construction.
1 Longmen Bridge project construction always adheres to the concept of " green water and green mountains are gold and silver mountains ", earnestly grasp the focus of ecological protection work, strictly adhere to the ecological red line, minimize the damage to the ecological environment system by project construction, and strive to build a harmonious and win-win green development picture of ecological environmental protection and engineering construction.
During the construction process, the project implemented the protection of mangrove forests within the construction scope by optimizing the construction technology, setting up mangrove growth monitoring points, setting up warm lights, and "bathing" for mangroves to reduce dust. It carried out 7.23 hectares of mangrove forests in other places, and cooperated with scientific research institutions to try to transplant more than 1,100 mangrove plants. On this basis, the Longmen Bridge project carried out in-depth research and successfully promoted the establishment of the scientific research project "The impact of cross-sea bridge construction in Beibu Gulf region on mangrove ecosystem and research on key technologies for mangrove transplantation", and strived to build the project into a demonstration project for the construction of mangrove protection of cross-sea bridge under complex sea conditions.
Construction of the gantry bridge coexisted harmoniously with mangroves.
At present, the construction work of the Longmen Bridge project is steadily advancing. In the next step, the Longmen Bridge project will continue to practice the concept of green development, improve quality and efficiency, and fully promote the Ministry of Transport’s “Strong Transportation Country and Science and Technology Promotion” pilot project and the “Safe Centennial Quality Project” demonstration creation work, and continuously improve the quality, safety and durability of project construction.
Pictures and texts｜Peng Yanze Wang Jiejing
Editing｜Zhao Guifang Huang Jinglan
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