Abstract:Numerical calculation in the process of subway monitoring is an important link in the monitoring and measurement technology, which directly affects the quality and reliability of the monitoring results. This paper synthesizes the situation of tunnel construction monitoring in some areas, and comprehensively introduces the calculation methods and principles of tunnel displacement allocation, commonly observed physical quantities, monitoring of adjacent underground pipelines, and monitoring of differential settlement of ground buildings in the process of tunnel engineering monitoring, which can be used as a reference for the counterparts.

Abstract:In this paper, by taking the calculation of theoretical elongation value of strand of 20m prestressed hollow core slab as an example, the segmental calculation method of theoretical elongation value of prestressing tendons in curved distribution is introduced in detail, and by comparing with the theoretical elongation value of the non-segmental calculation, it is concluded that the importance of segmental calculation of theoretical elongation value of prestressing tendons in curved distribution is achieved.

Abstract:A subway station is constructed by the open excavation shunzhu method and supported by steel pipe transverse bracing. According to the requirements of design and construction, the station was monitored for surface settlement, horizontal displacement of piles, axial force of support and pit bottom uplift. This paper analyzes, predicts and feeds back the monitoring results to provide a reliable basis for information design and construction.

Abstract:This paper comprehensively introduces the main parameter design method of mining prestressing anchor cable and the construction technology of single bundle resin anchorage anchor cable. The introduction of important influencing factors such as anchorage efficiency coefficient and tension stress control coefficient in the calculation formula is an important reference value for determining the safety coefficient of the anchor cable. The calculation formula summarized in the paper is more clear and practical.

Abstract:Pressure-dispersed prestressing anchor cable is more and more widely used in complex high slope reinforcement projects because of its many advantages, and the scientific and reasonable selection of construction technology combined with the nature of the slope rock and equipment conditions is the key link to achieve the desired results. This paper combines the Jinliwen Expressway 17 standard project examples, from the construction organization, field test, drilling, grouting, tensioning, monitoring and other aspects of the pressure dispersed prestressing anchor cable construction process is discussed in detail, for similar projects to provide some reference experience!

Abstract:This paper describes the structure and characteristics of the OVM250 unbonded parallel strand tie system, and the fatigue tests of the OVM250-31 tie anchorage conducted in the CTL laboratory in the United States.

Abstract:Extracorporeal prestressing technology is mainly used in bridges and other structural forms of construction, with the structural performance of extracorporeal prestressing, the corrosion problem of extracorporeal prestressing steel cables, the anchorage performance of the anchorage, fatigue resistance, and construction process simplicity and reduce the cost of the project and so on the various aspects of the problems are solved constantly, promote the development of extracorporeal prestressing in concrete structures. ovm.t15-25 extracorporeal prestressing system is a kind of single OVM.T15-25 extracorporeal prestressing system is a kind of single cable-exchange extracorporeal prestressing system. This paper talks about the application of OVM.T15-25 extracorporeal prestressing system in the project by combining the construction process of prefabricated suspension assembly of 75m span segmental continuous box girder for the superstructure of Sutong Bridge B2.

Abstract:This paper introduces the application of slow-bonded prestressing technology in the expansion project of Tianjin Lishen Battery. It focuses on the design calculation of slow-bonded prestressed reinforced concrete and the deployment and tensioning of slow-bonded prestressing tendons, and also describes the advantages of this technology.

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