Abstract:Short tower cable-stayed bridges generally use round tube-type split wire pipe saddles, and adopt the structural form of anti-skid keys cross-anchoring when achieving the function of single anti-skid and single replacement of cables. However, when the unbalanced force on one side of the cable is high, the arrangement of cross-anchoring of anti-skid keys cannot meet the working condition of large unbalanced force on one side. A one-sided bidirectional anti-skid replaceable anchorage system is proposed. Taking the Taiwan Xiaobantian short tower cable-stayed bridge project as the background, this paper studies the application of this anchorage system in short tower cable-stayed bridges. Through finite element analysis, physical simulation tests, saddle anti-skid force tests, segment model tests, cable replacement tests, etc., the problem of single anti-skid and single replacement of cables under the working condition of unbalanced force on one side of the cable is solved, and it is successfully applied in Taiwan Xiaobantian Bridge.

Abstract:Design threaded component models and pie and screw test pieces, simulate the use of cable anchorages, and conduct related anti-corrosion technology research. Propose the concept of powder zinc impregnation combined anti-corrosion technology, research and analyze the process methods for long-term anti-corrosion of bridge cable anchorages, conduct composition and metallographic analysis of anti-corrosion zinc impregnation coatings, and design powder zinc impregnation combined anti-corrosion technology. According to the service conditions of the workpiece, carry out process trial production, verify its anti-corrosion performance, study the process parameters of different anti-corrosion levels, so as to meet the anti-corrosion needs of bridge cable anchorages in different service environments.

Abstract:This paper analyzes the structural protection technology under overload conditions, studies the new pressure relief anchorage technology that can meet the requirements without increasing the strength of the tensile components, and uses its continuous constant force output characteristics to improve the structure of the pressure-dispersive anchor cable. The structural principle of the pressure-relief pressure-dispersive anchor cable is proposed, which effectively overcomes the original structural defects of the pressure-dispersive anchor cable. After engineering application, it is proved that its structure is reasonable, anchoring is convenient, and the reliability of construction is greatly improved.

Abstract:This paper studies the waterproofing and anti-corrosion technology of the anchor head under the suspension cable of Liede Bridge in view of the diseases and characteristics of the suspension cable that occurred at the anchor head under the suspension cable. A new sealed waterproof structure is adopted and indoor and field tests are carried out respectively. According to the results of indoor and field tests, scientific and reasonable maintenance and management countermeasures are formulated and popularized in the treatment of diseases at the anchor head under Liede Bridge, achieving good results.

Abstract:Taking the first application of the top pushing construction method in the Changzhuang Reservoir section of the Luohai Road Expressway project in Zhengzhou City as the background, this paper introduces the design of the construction scheme, related construction technology and key points of the ZLD automatic continuous top pushing system applied to the top pushing of corrugated steel web PC composite beam bridge. Engineering practice shows its superiority in synchronous control, high degree of automation, and flexible construction. It can adjust the top pushing force in real time according to the horizontal reaction force and deformation at the top of the pier, improving the efficiency and safety reliability of top pushing engineering construction, and has a wide application prospect.

Abstract:Rubber bearings, as an important force transmission device for bridges, are erected on piers and abutments, supporting the upper structure of the bridge, and are an important structural component connecting the upper and lower parts of the bridge. However, due to the increase in the service life of the bridge, the impact of the field environment, the increase in traffic flow, lack of maintenance over the years, and aging of the bearings, a series of problems such as cracking, deformation, hollowing out, and displacement have occurred in the bridge bearings, and they have gradually lost their use function. The relevant technology and construction for replacing bearings have emerged as a result. Based on the analysis and practical experience of replacing bearings in the Qingquansi Jialing River Grand Bridge project in Nanchong, Sichuan, this paper discusses the construction technology method of synchronous jacking replacement of bearings for reference in similar situations.

Abstract:Prestressed carbon fiber plate technology is a new type of reinforcement and reinforcement technology. Compared with traditional carbon fiber plate bonding reinforcement, it belongs to active reinforcement technology. It uses the high strength and high elasticity material characteristics of carbon fiber plate and the principle of prestress technology. By pre-tensioning the carbon fiber plate, the carbon fiber plate is already at a high stress level before bearing the load stress transferred by the structure, thereby achieving the purpose of improving the structure’s stress.