Abstract:After entering the 21st century, China's bridge construction has ushered in a new climax. The construction of Donghai Bridge in Shanghai marks the beginning of China's construction of a long bridge across the sea. Sutong Bridge and Lupu Bridge in Shanghai provide opportunities for China's bridge industry to hit the record of more than 1000 meters of cable-stayed bridges and arch bridges

Abstract:Taking the service life of Hong Kong–Zhuhai–Macau Bridge for 120 years as an example, this paper makes quantitative analysis on the carbonization process and chloride ion invasion process of concrete structure, and expounds in detail the measures to improve its durability. At the same time, it expounds in detail the anti-corrosion measures for steel structure components such as steel box girder, bridge deck, cable stayed cable, steel anchor beam, steel anchor box, etc., which provides a certain reference for the durability design of bridges in the same environment

Abstract:This article analyzes the causes of bridge cable corrosion through investigation of disease accidents in bridge cable engineering, as well as research and experiments on the corrosion of steel strands and the cracking of HDPE sheath materials, and explores strategies and measures to improve the safety, reliability, and durability of cable

Abstract:This article delves into the basic calculation and design issues of concrete bridges, including the indicator stress of bridge structures, the analysis methods of concrete box beams and steel-concrete composite beams, the cracking deflection problem of large-span prestressed concrete beam bridges, the external prestressing reinforcement method, and the active use of external prestressing steel tendons to improve the crack resistance of box beam structures. It points out the shortcomings and deficiencies of current structural analysis and reinforcement methods, I hope to have a more complete and in-depth understanding of the spatial stress characteristics and the essence of reinforcement methods of bridge structures, in order to provide useful suggestions for the design of bridge structures in China to be more refined and complete, and to promote the engineering safety and durability of bridge structures

Abstract:In the early 1980s, anchor cable reinforcement engineering required the installation of observation anchor cables, and the reinforcement of large deformation rock masses required the use of unbonded anchor cables. The engineering needs led to the emergence of unbonded anchor cables in China. At that time, there was no unbonded steel strand, and only smooth steel strands could be used for self-made production. Therefore, unbonded anchor cables were very non-standard. In the early 1990s, the standardized structure and construction technology of unbonded anchor cables were introduced into domestic hydropower construction, and were quickly promoted. However, in engineering applications, it is too simplistic to replace the double layer isolation layer with a single layer, and to replace the protective cap filled with anti rust grease with concrete or cement mortar at any time, which is difficult to ensure its permanence and poses a hidden danger to the safety of the project. The steel strand of the unbonded anchor cable is not bonded to the surrounding rock, and the reinforcement of the anchor cable to the rock depends entirely on its tensile force. The tensile force of the anchor cable only depends on the clamping force of the clip on the steel strand. Under the high stress action of hundreds of years, the clip and the section of steel strand it holds produce creep and corrosion, which will inevitably reduce the support force of the anchor cable to the rock. In the reinforcement of highway slopes with unbonded anchor cables, there has been more than one project that has failed due to the impact of rainwater on wind fossils and soil under the grid structure, causing the anchor cables to lose tension and the slope to lack support force