Abstract:The structure and process of OVM250 parallel strand cable system are introduced through the technical comparison of parallel strand cable system at home and abroad.

Abstract:OVM company developed a new generation of cable - OVM parallel strand cable system, has many advantages, is the new trend of the development of cable-stayed bridges, it has been successfully used in Liuzhou four bridges and other five bridges, and is being used in the construction of the Boulder Bridge, the results have been awarded the second prize of the Ministry of Construction Science and Technology Progress in 1996.

Abstract:This paper mainly introduces the design conditions of the prestressing anchorage system of Xiamen Haicang Bridge anchorages, the characteristics of the system, as well as the production and processing requirements of the anchorage system, construction requirements, anti-corrosion measures and so on.

Abstract:YCW series lightweight jack is a new type of tensioning jack developed by OVM company with the application of computer optimization design technology and ultra-high-pressure pre-processing technology, which is about 30% lighter than the original series. It has been successfully applied in more than ten projects and has declared national patent.

Abstract:In this paper, the computer finite element analysis software is used to model and calculate the intrinsic frequency of extracorporeal cable-stayed and simply-supported bridges, and the results are compared with those of the theoretical formulas.

Abstract:The axial length of the 1-6# dam section of the Three Gorges left bank plant is 229.8m, and a high slope of nearly 70m was formed after the foundation excavation. Due to the combination of fractures, the sliding surface is unfavorable and tends to be downstream. Reinforcement treatment mainly adopts 3000KN grade prestressing anchor cable, total 218 bundles, length 30-55m, drilling hole diameter 165, total footage 8445.6m. Anchor cable construction and steel pipe trench excavation are carried out cross. After construction monitoring, the actual elongation of the anchor cable matches well with the theoretical value, and the loss of locking anchorage is 1%~3%, which meets the design requirements.

Abstract:Frame lattice beam prestressed anchor cable is a new type of structure in slope management. It can be very effective in stabilizing the slope to achieve the purpose of thorough management, and at the same time, it is economical and reliable, and beautifies the environment. This paper introduces the frame lattice beam prestressing anchor cable in Yunnan Chudai highway Mazhuang pass section of the right slope management in the application of the first discussed Mazhuang pass section of the engineering geological conditions, and then put forward the design ideas, and finally introduces the construction process and quality inspection.

Abstract:In order to solve the problem of prefabrication of main girder blocks of Tianjin Yonghe Cable-stayed Bridge, it is proposed for the first time that the vertical prestressing tendons in the three-way prestressing blocks are made of non-bonded prestressing thick steel tendons, which mainly solves the problems of making holes for the weak section of the blocks and the problem of slurry cascading and simplifies the construction process.

Abstract:The main bridge of Hunan Hengshan Xiangjiang Highway Bridge is designed as a cable-stayed bridge and continuous girder, which is constructed by two-way jacking method on both sides of the bridge. By setting up temporary piers, the navigable main span is transformed into a jacking span, and when the box girders are prefabricated and jacked in place, the towers, cables and cable ties are poured, the temporary piers are removed, and the conversion of the continuous girder to the cable-stayed bridge system is completed. Item push method construction cable-stayed bridge, the process is relatively simple, to expand the top push method in the application of large-span bridges carried out a useful exploration!