Abstract:Jiaolongba Bridge in Tibet is a controlling bridge connecting Markam County in Tibet and Dêqên County in Yunnan Province on the 214 National Highway (Yunnan Tibet Highway). It is the only way for the southern line to enter Tibet, and its strategic position is very important. The main span of the Suspension bridge is 345 meters, which effectively avoids the impact of adverse geology such as debris flow. The foundation of the cable tower and the anchors on both banks make full use of the bedrock. The main girder of the truss is divided into manufacturing sections and installation sections, giving consideration to the construction conditions and the force of the completed bridge

Abstract:In bridge construction, the requirements of internal prestress on the anti-corrosion performance and strength of cable body are constantly improving. Epoxy coated steel strand is widely used because it meets the above requirements. The application of epoxy coated steel strand for internal prestress has more advantages. This paper introduces the specific application of epoxy coated steel strand in the anchorage of Runyang Yangtze River Bridge Suspension bridge

Abstract:This paper introduces the structure and construction technology of catwalk of TUTI Suspension bridge in Sudan

Abstract:Taking the construction practice of box girder in Sihui West Interchange Ramp Bridge Project of G55 Erenhot–Guangzhou Expressway as an example, this paper introduces the characteristics of cast-in-place construction technology of prestressed continuous box girder of ramp bridge from the aspects of support engineering, formwork engineering, reinforcement engineering, concrete engineering and prestressed engineering

Abstract:Pressure dispersed anchor cable is a new type of anchor cable that has recently emerged. The "Technical Specification for Rock and Soil Anchor Rods (Cables)" approved for implementation in 2005 recommended it as a permanent anchor cable, greatly expanding its scope of engineering applications. From the published papers, it can be seen that many units are still conducting in-depth research. This article elaborates on the background, structure, and stress characteristics of pressure dispersed anchor cables, comprehensively analyzes the problems that exist when used for permanent support in geotechnical reinforcement, and clearly proposes that pressure dispersed anchor cables should not be used as observation anchor cables or permanent engineering anchor cables in geotechnical reinforcement

Abstract:The distribution pattern of Shear stress at the first and second interfaces of the bolt was tested indoors by using three surrounding rock media of high, medium and low strength. On this basis, the interaction between the first and second interface Shear stress of the bolt is analyzed. It is pointed out that the Shear stress of the second interface is the result of the attenuation of the Shear stress of the first interface; The Shear stress of the first and second interfaces attenuates along and perpendicular to the axis of the bar, and there is a phenomenon that the ultimate Shear stress, zero Shear stress and local failure of the slurry basically transfer to the depth of the bar at the same time; It is emphatically pointed out that the theoretical basis of the average Shear stress the theory of the microstructure of the bolt interface is irrefutably misleading

Abstract:This article briefly introduces the research and application status of a composite soil nail support type composed of soil nail support, reinforced soil (improvement), and facade light retaining wall. It provides a complex failure mode of compacted fill slope. Based on an overview of the hydrological and geological conditions of a certain project in Luoyang, the technical scheme and construction method of using the composite soil nail support mentioned above are introduced, and its stability is evaluated based on monitoring results and macroscopic observations

Abstract:This article proposes two seismic analysis methods for anchor systems and introduces the response of different types of anchor cables to dynamic loads. The author believes that in the design of major geotechnical anchoring projects or geotechnical anchoring projects in strong earthquake areas, dynamic load effects must be considered; From the perspective of resisting misalignment and avoiding significant stress concentration, pressure type anchor cables are superior to tension type anchor cables

Abstract:This article takes a long tunnel and subway project as an example to briefly discuss the selection of concrete materials and mix proportions, construction technology and machinery in wet spraying technology, and compares them with dry spraying and wet spraying methods. At the same time, it points out the application prospects of wet spraying concrete technology in underground engineering.

Abstract:Based on practical experience, this article summarizes the quality problems that are prone to occur during the construction of concrete bored piles, and proposes measures for pre control during the supervision process.