A few days ago, the 2023 Academic Annual Conference of the China Highway and Transportation Society held in Zhangjiagang released the results of "Jiangsu Province Expressway Intelligent Construction Practice", which laid the foundation for the subsequent innovation and development of Jiangsu Expressway intelligent construction technology, and also provided a reference for national counterparts. With the theme of "Intelligent Construction of Highway Infrastructure", the event showcased the scientific and technological innovation achievements and development models of the national highway industry in intelligent construction, and nearly 800 industry representatives from China gathered together to focus on engineering technology innovation, discuss the development direction of the industry, and share the most cutting-edge scientific and technological views and development strategies in the field of intelligent construction for the industry and the industry.
Intelligent construction is the key path for the high-quality development of highway construction
During the construction of the highway, unmanned road rollers drive in groups to compact asphalt on the road surface, which not only makes the construction safer, but also has higher compaction uniformity; In the smart beam factory, precast beams and pier columns are customized on the assembly line, and then transported to the transportation construction site for assembly, and many elevated and bridges are built by this "building block" method.
In recent years, Jiangsu has effectively promoted the development of intelligent construction around the construction of major highway infrastructure, and built a series of excellent quality projects such as Zhangjinggao Yangtze River Bridge, Changtai Yangtze River Bridge, Beijing-Shanghai Expressway Reconstruction and Expansion, etc., and achieved fruitful phased results.
"The intelligent construction of highway infrastructure is the key path and important guarantee for the high-quality development of highway construction." Zhou Haitao, vice president of the China Highway and Transportation Society, said that the intelligent construction practice of Jiangsu Expressway has explored the "point-line-surface" digital design mode to build an intelligent construction base; The second is to realize the transformation from "field" to "factory", forming an intelligent and industrialized construction mode; Third, the deep integration of innovative information and engineering enriches the intelligent construction scene.
Weng Mengyong, chairman of the China Highway and Transportation Society, proposed that promoting the intelligent construction of highway infrastructure is conducive to improving project quality and safety, optimizing resource allocation and reducing costs, is conducive to achieving green and low-carbon highway transportation, and is conducive to promoting intelligent transportation and building smart highways. At the same time, it is necessary to promote the establishment of a standard system for highway intelligent construction, and build a development ecology conducive to the development, cross-border integration and collaborative innovation of highway intelligent construction. ”
Chen Jindong, general manager of Jiangsu Communications Holdings Co., Ltd., introduced that Jiangsu Traffic Control and the Provincial Communications and Construction Bureau jointly invested in the construction of the future-oriented Wufengshan Expressway and the Taihu Lake Tunnel of Suxi Changnan Expressway using a large number of intelligent construction technologies. For example, the use of automatic steel bar processing equipment such as intelligent sorting robots to reduce manual input; At the same time, a fully enclosed concrete supply center integrating modernization, intelligence, informatization and mechanization is set up, and distributed optical fiber sensing technology is introduced during the pouring process, which overcomes a series of problems and ensures the one-time pouring of the tunnel floor.
The future development trend of expressways is digitalization, intelligence, networking and greening.
Special asphalt mixture, which can automatically adjust the temperature of the road surface; With the help of 5G technology, the deep integration of BIM, big data, Internet of Things and other technologies with highway construction has been promoted, and the Wufengshan Expressway has realized the application of more than 20 innovative scenarios, including the first open eight-lane expressway vehicle-road collaborative test and demonstration application in China. As an intelligent tunnel, the Taihu Lake Tunnel combines 5G technology, Beidou precise positioning, optical fiber detection, multi-target radar tracking, big data analysis and other technologies during construction to achieve the deep integration of modern high-tech and highway construction.
Intelligent bridges rely on multi-industry collaboration to achieve upgrading and development
The development of infrastructure intelligent construction technology is the main content of the "transportation power" strategy, and promoting the digital transformation of infrastructure is an inevitable requirement for the high-quality development of the transportation industry.
Changqiao Tunnel is one of the main forms of cross-lake, cross-river and cross-sea channels, and at present, Jiangsu is fully promoting the construction of world-class river crossing channels. According to the "Yangtze River Trunk Line Corridor Layout Plan (2020-2035)" issued by the National Development and Reform Commission, by 2035, a total of 276 Yangtze River trunk corridors will be planned and deployed, of which 44 will be in Jiangsu. The world-class bridge and tunnel project has created important development opportunities and challenges for the intelligent construction of major special structures.
Zheng Jianlong, academician of the Chinese Academy of Engineering and vice chairman of the China Highway and Transportation Society, introduced that the intelligent construction technology of highway infrastructure is the integration and deep integration of new technological revolutionary achievements such as information technology, digital technology, and new material technology with traditional infrastructure construction technology. For example, the Hong Kong-Zhuhai-Macao Bridge adopts intelligent construction technology and uses industrial "building blocks" to build the bridge, showing the characteristics of large-scale, factory, standardized and assembly, among which, steel box girder is prefabricated and prefabricated and assembled for island tunnel engineering.
Zhang Xigang, academician of the Chinese Academy of Engineering and chief scientist of China Communications Construction Group, said that intelligent bridges are based on the full development of bridge industry chain technology, facing the three major needs of "safety, intelligence and green", fully integrating digital technology, taking intelligence as the core, realizing a new generation of bridge projects with intelligent design, intelligent construction, intelligent management and intelligent use, the basic characteristics of which are industrialization, digitalization and intelligence.
"The research and application of intelligent bridge technology is a gradual development process, and the first generation of bridge engineering mainly uses natural materials of wood and stone and is built by artificiality; The second-generation bridge project mainly uses concrete and steel materials and is built by machinery; The third-generation bridge project mainly uses intelligent and high-performance materials to build and maintain in an intelligent way. Zhang Xigang believes that the integration of intelligent technology and bridge technology will promote the development of the "third generation bridge project". The overall development goal of future bridge development is: by 2025, breakthroughs will be made in intelligent bridge design and simulation analysis software, and big data center architecture integrating bridge construction and maintenance will be built; By 2030, the digitalization rate of bridge engineering will reach 60%, the core software for design and simulation analysis will be basically localized, and a national intelligent early warning network for bridge engineering will be built; By 2035, the digitalization rate of bridge engineering will reach 90%, establish a long-term, efficient, automatic and accurate bridge monitoring system, have construction and management technology and independent controllable equipment that match the national development strategy, and form a national and regional bridge science and technology innovation platform.
At present, the bridge still faces great challenges in structural safety, longevity protection and health operation and maintenance, and further breakthroughs are needed in technology.
"Intelligent bridges must rely on multi-industry collaboration and multidisciplinary cross-integration to achieve upgrading and development, and give full play to the value of digital and intelligent industrial reshaping, promote industrial upgrading, and meet future needs." Zhang Xigang said that building a "new quality productivity" of bridges is the only way to transform and upgrade the bridge industry. The "newness" of "new quality productivity" comes from scientific and technological innovation. This requires industry-wide, multi-disciplinary and multi-industry collaborative innovation, step-by-step implementation and continuous research. It is necessary to deploy the scientific and technological force system around the demand chain, technology chain and value chain, and implement technical research in accordance with the three steps of technological upgrading, digital transformation and intelligent construction.
It is understood that at present, the National Key Laboratory of Safety and Longevity and Health Operation and Maintenance of Long Bridges, the National Engineering Research Center for Highway Long Bridge Construction, the Bridge Research Center of Southeast University and other institutions are striving to carry out core technology research on long bridges.
Jiangsu is actively exploring the construction of smart highways in the new era
In recent years, Jiangsu has built a modern comprehensive transportation system, up to now, the total mileage of high-speed railways in the province has exceeded 2,500 kilometers, the mileage of expressways has reached 5,087 kilometers, a total of 18 river crossing channels have been built, 10 are under construction, and the ratio of total social logistics expenses to GDP in the province has dropped to 13.5%, which is 1.2 percentage points lower than the national average, and the level of transportation development continues to remain in the forefront of the country.
With the continuous advancement of the scientific and technological revolution and industrial transformation, the state has intensively issued a series of policies to accelerate digitalization and new infrastructure, and the construction of smart highways has entered a stage of acceleration. Wu Yonghong, director of the Department of Transport of Jiangsu Province, introduced that Jiangsu is actively exploring the construction of smart highways in the new era, introducing the country's first new infrastructure action plan in the field of transportation, taking the lead in issuing technical guidelines for smart highway construction, and building a number of smart highway demonstration projects. Intelligent transformation to achieve higher quality, more efficient, more sustainable and safer development of road transportation.
"The fundamental purpose of developing intelligent construction technology for highway infrastructure is to improve project quality, extend structural life, enhance structural toughness, and reduce project cost with the help of new technologies such as intelligence." Zheng Jianlong said that with the advancement and comprehensive application of structural design, new material technology, digital computing technology and artificial intelligence technology, the intelligent construction technology of highway infrastructure will be rapidly developed, and the development goals of road infrastructure will be safer, more durable, lower carbon and more efficient.
Focusing on the "Exploration and Practice of Intelligent Construction Technology of Jiangsu Expressway", Jiang Zhenxiong, member of the Party Group of Jiangsu Provincial Department of Transport and Director of the Provincial Bureau of Communications and Construction, elaborated on many application practices in intelligent construction in Jiangsu in recent years-relying on the construction of expressways such as Lining and Gaoxuan, the application and promotion of 3D paving technology was carried out to improve the level of road surface flatness; Relying on the development and application of the "Fusion" integrated bridge erecting machine of Jianxing Expressway construction, it realizes the erection of box girders, cover beams and columns, improves construction efficiency and saves human resources; Relying on the construction of Changtai Bridge, intelligent soil extraction and scanning robots are used to realize the digitalization and visualization of the steel sinking construction process to ensure the sinking accuracy...
Before 2035, Jiangsu plans to build 1,230 kilometers of expressways, plan to renovate and expand 1,075 kilometers of expressways, and the scale of highway construction provides an important platform for the promotion of intelligent construction of roadbed pavement bridges, and the reconstruction and expansion of expressways will provide an important stage for the development of intelligent construction of bridge assembly. Jiang Zhenxiong said that at present, based on the "1739+N" expressway "digital traffic construction" platform in Jiangsu Province, Jiangsu has built a digital top-level architecture, providing a strong digital foundation for intelligent construction. In the future, the intelligent construction of Jiangsu Expressway will focus on the 4.0 era of full digitalization, unmanned and automation of all factors, and strive to build the "Soviet-style construction" brand of Jiangsu Expressway.
At the construction site of the Yangtze River Bridge in Zhangjinggao, the reporter noticed that the builder used UAV industrial digital photogrammetry technology to position and control the cluster bolts of the bridge, and the error was said to be less than 2 mm. Recently, the first concrete of the south main tower of the south channel bridge of the Zhangjinggao Yangtze River Bridge was poured for the first time, marking that the four main towers of the bridge have entered the construction stage of the bearing tower column, and the 350-meter-high south main tower of the bridge will become the world's tallest suspension bridge main tower after completion, which is inseparable from the "wisdom" of intelligent construction.
Xinhua Daily Junction reporter Mei Jianfei