Abstract:With the rapid development of high-speed railway, the structure of railway bridge is diversified, and ultra-large road degree and ultra-large weight have become the main characteristics of high-speed railway bridge across the river. Among them, steel frame beams with large span and large tonnage have become the main structural system of railway across the river due to their excellent characteristics. The innovation of construction method and technology for erection of large-span and large-tonnage steel beams in rivers and valleys has become the key to the successful installation of large-span and large-tonnage steel beams. The technology based on multi-point synchronous hydraulic control, flexible traction and steel joint sliding boots is the key innovation technology to realize the erection and installation of large-span and large-tonnage steel beams. The successful application of this technology provides reference and experience for the construction of similar large-span and large-tonnage steel Bridges across rivers and valleys.

Abstract:Aiming at the shortcomings of traditional bridge appearance inspection methods in practice, a bridge appearance inspection technology based on multi-rotor UAV is proposed. The technology uses a camera mounted on a drone to extract the bridge surface image from a close distance, and uses image processing technology to detect surface defects. Combined with Xiamen Haicang Bridge project, the application results show that the technology can efficiently, comprehensively and accurately complete the bridge appearance inspection.

Abstract:Bridge is the key node and hub project of traffic engineering, and it is also the embodiment of the comprehensive national strength of a country or region, such as economic strength, science and technology, and productivity development. Bridge intelligentization is the development trend of bridge in the era of knowledge economy, and it is also a key step in the process of China's transition from a bridge country to a bridge country. The general situation of the development of bridge intelligence in China is discussed by focusing on four aspects: bridge intelligent materials, bridge intelligent construction technology and equipment, bridge intelligent monitoring technology and equipment, and bridge intelligent maintenance management based on information technology.

Abstract:According to the characteristics of Liangqing Bridge and the situation of construction site, the main cable erection traction system is improved, and a new single-line three-stage reciprocating traction system is put forward. The application of this system greatly improves the main cable erection efficiency, shortens the construction period and guarantees the construction quality. This method provides a reference for the construction of the main cable of the long-span suspension bridge in China, and has important popularization value.

Abstract:Reinforcement sleeve grouting joint technology is a new type of reinforcement joint developed and applied in recent years in our country, the development status of reinforcement sleeve grouting joint technology at home and abroad is introduced, and the construction of reinforcement sleeve grouting joint is conducted, and the application of reinforcement sleeve grouting joint technology in real Bridges is studied based on a bridge project on S6 highway, and good results are obtained Good results can provide reference for the same type of engineering applications.

Abstract:Based on the actual situation of Beipanjiang Bridge, the paper introduces the successful application of OVM250 steel strand cable system on Bepanjiang Bridge, the world's first high bridge, from the aspects of cable characteristics, cable structure and anchor element analysis. It is proved that OVM250 steel stranding cable "breaking the whole into pieces" can solve the limited problems caused by inconvenient traffic and harsh environment, and has the advantages of no large cable making, transportation, lifting and tension traction equipment and excellent overall protection performance.

Abstract:In order to develop the main cable with high fatigue resistance that can meet the requirements of the FAST project, the fatigue performance of the main cable of the cable network was innovated, and the innovative design and improvement of the raw material, anchor structure, cable body structure and key manufacturing process were verified through the fatigue test. The experimental results confirmed that the maximum fatigue stress range of the improved and innovative main cable of the cable network could withstand could reach 50 0MPa, which meets the requirements of high fatigue resistance of FAST project.