Abstract:This article combines the structural design of large unbonded prestressed culvert pipes in the Dongshen Water Supply Renovation Project, and conducts stress analysis and research on two types of prestressed anchoring schemes: ring anchor and counter anchor using three-dimensional finite element technology. The main analysis is to analyze the prestressed loss and prestressed effect under the two schemes, and comprehensively consider factors such as construction to establish a reasonable prestressed anchoring scheme, providing a basis for design

Abstract:The Caohe Aqueduct is a large intersecting building in the middle line of the South to North Water Diversion Project, and ensuring the safety of the building in design is crucial. By optimizing the structure of the aqueduct body, the body was changed from unidirectional prestressing to three-dimensional prestressing, which improved the crack resistance of the structure and saved engineering quantity and investment

Abstract:The geological conditions of the slope of Longtan Dam are complex, and the maximum slope height of the intake slope is 435m. In order to ensure the overall stability of the high slopes on the left and right banks and the long-term operation safety of the project, 1000kN, 2000kN and 3000kN prestressed anchor cables are used in the reinforcement and support of the left and right bank slopes of the Longtan Project to improve the overall stability of the slope. This article mainly introduces the design, construction, and tensioning program of prestressed anchor cables

Abstract:In the construction of Gaoku Dam, there is a significant thrust force on the radial gate of the gate chamber. In order to improve the unfavorable stress state of the gate pier, the OVM.U prestressed anchoring system is used for reinforcement, which has a significant effect. This article introduces the structural characteristics and advantages of this system in combination with engineering applications, which has direct practical significance for future hydropower dam construction in China

Abstract:Cable and prestressed steel bars are important components in bridge structures, and timely monitoring and monitoring of their stress state during construction and operation is extremely important. A magnetic flux sensor based on the principle of magnetoelastic effect measurement can effectively measure the stress of cables and prestressed tendons, and is a new non-destructive testing technology. The principle and performance of magnetic flux sensors were studied in detail in the article, including measurement formulas, temperature effects, the influence of cable components themselves, and sealing and waterproofing performance. When using magnetic flux sensors, it is not necessary to understand the loading history and usage of the components. By sensing the changes in magnetic properties of the components, stress can be measured, which can be used for newly made bridge cables, existing bridge cables, and prestressed tendons. For existing bridge cables, on-site winding of sensors is required. The article introduces the application of magnetic flux sensors in practical engineering projects such as monitoring the stay cables of Zhanjiang Bay Bridge, monitoring the internal prestressing force of Nanning Huludang Bridge, and monitoring the construction and operation of stay cables of Yibin Yangtze River Bridge

Abstract:The cast-in-place box girder support of Zhongzhou Bridge adopts a steel pipe Bailey beam column structure, and the construction needs to address the design, verification, and key construction points of the support system. In practice, a 12 meter span Bailey assembled simply supported beam structure is used, with double row pipe piles supporting the middle pier and vibration hammering to set up pipe piles. Based on the stress analysis, the arrangement of Bailey beams is determined, and strengthening measures are proposed based on the pre compression and observation of the support. Practice has proven that the design and construction of supports are feasible

Abstract:This article briefly reviews the understanding of permanent anchor cable protection in the anchor cable industry in China, and elaborates on the protection principles and methods of permanent anchor cables in response to the potential hazards they may encounter during long-term operation. It points out that some engineering design, construction, and certain anchor cable regulations are unreasonable, while also providing various standardized practices for permanent anchor cables. It is clearly pointed out that when anchor cables are used as permanent support, the type of anchor cable should be reasonably selected based on the specific environment of the project

Abstract:In the construction of large-scale hydropower projects in Qinghai Province, prestressed anchoring technology has been widely developed and applied. Combined with engineering construction, multiple scientific and technological achievements have been made in the exploration of new technologies in prestressed anchoring, the development of new construction processes, and the introduction and manufacturing of various anchoring devices. The development and application of these technological achievements have accelerated the progress of the project, saved investment, and improved the scientific and technological content of water conservancy and hydropower projects. Many achievements have not only generated huge economic benefits in the construction and safe operation of Longyangxia, Lijiaxia hydropower stations and other projects in Qinghai Province, but also made positive contributions to enriching China's prestressed anchoring technology

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