Abstract:By elaborating the connotations of data, information, knowledge, and wisdom, this study explores the application methods and value of emerging information technologies in various stages of the lifecycle of bridges. It also introduces the research and development practices and plans of Shanghai Tonghao Civil Engineering Consulting Co., Ltd. in applying information technology to the field of smart bridges.

Abstract:Based on the on-site conditions of the north and south anchor pit engineering of Liangqing Bridge in Nanning City, and taking into account the problems encountered in the construction of water-stop curtain using traditional sleeve valve pipe grouting method in karst areas, a simplified double sleeve valve pipe grouting method is proposed in this study. The construction process, operational key points, and effectiveness of the simplified double sleeve valve pipe grouting method are investigated. This method is suitable for deep foundation pit excavation in proximity to rivers and karst areas. It effectively improves the efficiency of hole grouting, solves the problem of excessive grouting volume and difficulty in filling the cracks due to rapid loss of grout through the fissures in the karst areas, and achieves the desired water-sealing effect. It provides valuable insights for water-stop measures in deep foundation pits in karst areas and holds significant potential for wider application.

Abstract:Currently, bridge construction technology is continuously innovating and changing. Computer-controlled hydraulic synchronous lifting and placement technology has been widely utilized in the overall construction of bridges. However, the synchronization requirements for the overall lifting and placement of bridges are very high, especially for large spans, high tonnage, and multi-point control. Ordinary valve blocks struggle to ensure synchronization accuracy, and setting up independent proportional valves can guarantee accuracy but at a significantly high cost. Therefore, finding a suitable and cost-effective synchronization control technology for multi-point (generally more than two points) lifting and placement of bridges is crucial. This study takes the Dongying Huangda Railway Special Bridge as an example, and explores the application of diversion and collecting valves (also known as synchronous valves) in hydraulic lifting and placement technology to address synchronization issues in large spans and multi-point control. Theoretical analysis and practical evidence demonstrate that diversion and collecting valve technology is economically practical and fully satisfies the synchronization accuracy of bridge lifting and placement. It is a promising new technology with beneficial implications for similar bridge construction projects.

Abstract:Combined with the Guangzhou-Foshan Intercity Dongping Waterway Special Bridge part of the cable-stayed bridge construction design, highlighting the cable-stayed cable design, research and some personal experience.

Abstract:With the continuous progress of national construction, the number of railway overpass bridges and river-crossing bridges has been increasing. For composite structure bridges, the steel structure components are often thin-walled, which imposes limitations on their load-bearing capacity. The control of structural stress and linearity during the construction process becomes challenging. To meet the requirements of rapid, safe, reliable, and high-quality construction, the incremental launching method is an effective construction technique. Taking the incremental launching method for the construction of the viaduct in Section 5 of the Kunming-Nan Connection Line Expressway as a background, this study focuses on the detailed design and research of the control scheme and control process during construction. A set of balance control strategies is developed to solve the construction challenges caused by uneven loading, axis deviation, and curved bottom beams. These strategies provide assurance for the smooth progress of bridge construction. The application of these strategies in engineering projects is also discussed.

Abstract:The steel strand cables anchored on the anchorage saddle on the tower in cable-stayed bridges have anti-sliding anchoring properties due to the frictional effect inside the metal splitting tubes. This study analyzes the transmission mechanism of the overall anti-sliding anchoring structure of the cables by implementing single-side arrangement of anti-sliding keys or dual-directional crossing arrangement of anti-sliding keys. Additionally, the principles and construction techniques of using ultra-tensile negative friction lock-in anti-sliding keys for cable-stayed bridges are proposed. Considering the possibility of deformation or blockage of individual splitting tubes during construction, which may prevent the steel strands from passing through and result in quality accidents, preventive measures are necessary. Adding spare conduits within the existing splitting tubes is a simple and effective method, which can also serve as backup pipes for future bridge reinforcement needs.

Abstract:Due to the gap between the outer HDPE sheath and the strands of hollow steel strand cables, conventional methods of measuring cable tension are not effective for hollow steel strand cables. One method is to measure the tension of individual strands by tensioning a single strand, but it requires a significant amount of work. Alternatively, based on the principles of probability statistics, a reasonable level of confidence is set, and the sample size range is calculated. By extracting the tension of the required sample size of steel strands, the tension of the entire cable bundle can be accurately obtained. This approach reduces the workload while ensuring accurate measurement of cable tension.

Abstract:To obtain force data for spherical bearings and facilitate the monitoring and evaluation of the operational status of bridge structures, a new type of force-measuring spherical bearing is studied. This design incorporates fiber optic grating sensing technology to detect the vertical load-bearing capacity of the bearings. Through experimental testing, it has been confirmed that this new type of force-measuring spherical bearing can conveniently and accurately collect the actual force distribution in engineering structures. It can provide effective scientific evidence for assessing the health condition of bridge structures.

Abstract:In order to overcome the limitations of traditional friction pendulum isolation bearings, a new type of adaptive multi-functional friction pendulum bearing has been developed based on previous research. Through vertical load-bearing tests and horizontal performance tests, the research results show that the yield force, post-yield stiffness, and equivalent damping of the bearing change gradually with increasing displacement. Compared to traditional friction pendulum isolation bearings, the new bearing exhibits better adaptability.