Abstract:In this paper, the approximate distribution of axial stress σ and shear stress τ between anchor solid and hole wall are obtained by means of the Kelvin problem displacement solution according to the coordinated deformation of anchor solid and rock mass in anchor hole. The results show that σ and τ in rock mass are concentrated near the stress point and the stress transfer length is only tens of cm. The concentration of σ and τ in soil is much smaller than that of rock mass, and the stress transfer length is greater than 20m. In this paper, the steel beam is used to replace the cement core column as the anchor solid body in soft soil, so that the two controlling stresses σ and τ concerned by the pressure type prestressed anchor cable are reduced by one, and only the shear stress τ is left. Because the steel beam is used as the anchor solid body, the shear stress τ peak value is greatly reduced and the force transmission length is greatly increased. It is pointed out that the use of pressure dispersion structure in soil is of little significance, and the use of hole bottom reaming can get satisfactory results. According to the results of this paper, replacing the cement core column with a section of steel pipe at the bottom of the pressure-type prestressed anchor hole in rock mass can cause the shear stress τ to disperse locally, and can replace the existing pressure-type structure under certain conditions.

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Abstract:Application of vacuum assisted grouting technology in prestressing construction of anchoring of Hongguang Bridge in Liuzhou

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Abstract:Asymmetrical cable-stayed Bridges are reviewed, and aesthetic and structural concepts are discussed and described in several recent design projects. Combined with the conceptual design of column and cable arrangement, the effect of plane bending is reviewed. It is suggested to use partial cable-stayed Bridges to reduce the additional internal forces of high piers caused by the plane bending of beams.

Abstract:This paper is translated from Chapter 16 "Falling-proof Bridge System" of Japan Road Association, which mainly introduces the support length of falling-proof bridge system, falling-proof bridge structure, displacement limit structure, dislocation prevention device, etc. In order to respect the original work, this article does not make any structural adjustments.

Abstract:The main bridge of Sohae Bridge in South Korea is a three-span superimposed girder cable-stayed bridge with a main span of 470m. LUD devices are installed between the tower beams. For sector double cable plane; The equal tension control method is adopted for steel strand tensioning. The design and construction of Xihai Bridge are introduced.

Abstract:This paper introduces the main causes of the main span downwarping and oblique cracks, longitudinal cracks and other defects of the long span beam bridge, and puts forward some suggestions to avoid such defects.

Abstract:Based on the design of the main bridge of Jinghang Canal bridge across the south of Pizhou city of Jiangsu Lian-Xu Expressway, this paper briefly introduces the design process, structural treatment characteristics and unique innovation of the bridge. The successful completion of the bridge has effectively verified the theory and method used in the design, and also accumulated reliable data for the future design of the same type of self-balancing system concrete-filled steel tube tied pole arch bridge. Its beautiful bridge shape and complex high-tech content occupy the leading level of the same type of Bridges in China and even in Asia.