Abstract:The development of bridge construction towards large spans, deep waters, nearshore areas, and steep mountains faces enormous technological challenges. After reviewing the technical difficulties of a batch of bridges such as the Sutong Bridge, the technological innovation of large-span bridges was summarized, and the key technical issues of large-span bridges were proposed. The concept of integrated design was proposed for small and medium-sized bridges with large quantities and wide areas; Analyzed the hot issues of bridge disaster prevention and reduction technology; The strategy of bridge Structural health monitoring and maintenance is discussed

Abstract:The material hardness of prestressed steel strands is not specified in the domestic and foreign steel strand product standards and prestressed structure design and construction specifications. In fact, it must match the hardness of the anchor clamp appropriately, and controlling the appropriate hardness can ensure that the teeth of the clamp bite into the surface of the steel strand during anchoring, and the wedging effect of the clamp can be achieved. Recently, it has been found that the clamping plates in some projects have poor engagement with steel strands, which has attracted the attention of the anchor standard revision group. Therefore, after investigation and inspection, it was found that the hardness of the steel strands currently produced and supplied is relatively high, indicating that this is the main cause of unstable anchoring. This article will publish the research results and provide suggestions on both steel strands and anchor clips for the attention of all relevant parties in the prestressing industry (owners, design, construction, product production, quality inspection, etc.)

Abstract:The low tower cable-stayed bridge is a new type of bridge both domestically and internationally, and there is currently no inspection standard for the wire separation pipe of the saddle at the tower column. This article combines the construction of a low tower cable-stayed bridge in Beijing to discuss the background of the production of inspection standards for the branch pipes of the bridge, provide specific inspection standards for the branch pipes of the bridge, and provide detailed explanations for each standard

Abstract:This article is commissioned by Mr. Ma Tielong Bayard MaTeron, Chairman of the International Concrete Faced Rockfill Dam Association. The article mainly discusses the application of prestressed technology to concrete face rockfill dams (CFRD), replacing some of the steel bars in the concrete face with prestressed steel bars, making it a two-way prestressed reinforced concrete face plate, thereby enhancing its crack resistance and reducing the amount of steel used in the face plate. It will systematically introduce the types of prestressed steel bars used, the proportion of replacement steel bars, the arrangement of prestressed steel bars, the methods of applying prestressed steel bars, and the tensioning protection measures, etc

Abstract:This article analyzes the structure and function of the lifting jack gripper anchor, especially the traditional control technology of the gripper anchor, points out the shortcomings of the traditional control method, and proposes a new type of hydraulic lifting jack gripper anchor control technology, which has been successfully applied to some major lifting projects in China

Abstract:This article introduces the application of bonded prestressed ring anchor technology in the digestion tank of Shanghai Bailonggang Urban Sewage Treatment Plant, and describes the processes of laying, threading, tensioning, and grouting of prestressed steel pipes.

Abstract:This article combines the tensioning process of a prestressed beam on the roof of a certain factory building to monitor the main control section stress, reverse arch value, elastic compression deformation, anchor deformation, internal shrinkage value of steel bars, and cracks under local pressure. The research results of this article provide important basis for controlling the tensioning effect of prestressed beams and ensuring construction quality, which can be used for reference by similar projects.

Abstract:This article introduces the structural characteristics of Nanning Bridge, the world's first large span curved beam asymmetric outward tilting arch bridge, and elaborates on the construction plan of "arch first, beam later, arch supported beam, and steel rib arch assembled by diagonal tension buckle cantilever". Practice has proven that this construction method is successful and feasible. Under this guidance, the temporary tie rods, temporary suspension rods, temporary crossbeams, and cable wind cables set up to increase the longitudinal and transverse stability of the arch ribs play a crucial role in the installation safety and quality assurance of the entire externally inclined structure, providing good reference experience for similar bridges in the future

Abstract:The Nange Bridge is a reinforced concrete prefabricated cable-stayed bridge. During the process of replacing the stay cables, a temporary cable support system is used to assist in the replacement construction of the stay cables. Due to the special structure of the main bridge, the temporary cables are connected to the main bridge structure using the principle of friction transmission force, and the friction type anchor box is designed. The anchor box system adopts a fully welded structure in the form of a hoop structure. During the replacement of the stay cables, a graded and multiple system transformations are used, Control based on the principle of basic invariance of elevation and displacement

Abstract:This article focuses on the construction practice of parallel steel strand cables on the Xijiang Grand Bridge of the Guangzhou Zhuhai intercity transportation track, focusing on the construction technology of parallel steel strand cables and successful application examples on high-speed railway cable-stayed bridges. It also discusses some problems that arise in the construction of parallel steel strand cables.