High-reliability real-time monitoring system and method for prestress construction of high-speed rail box girder steel strand

Abstract

The invention discloses a high-reliability real-time monitoring system and method for prestress construction of a high-speed rail box girder steel strand, and the system comprises a multi-measuring-point intelligent steel strand, a data collection and transmission module and a data processing module. The multi-measuring-point intelligent steel strand is used for replacing a common steel strand in a box girder to bear a load; the self-sensing of the pre-stress of a plurality of positions in the beam body is realized; the data acquisition and transmission module is used for capturing pre-stress data self-sensed by the multi-measuring-point intelligent steel strand and transmitting the pre-stress data to the data processing module; and the data processing module is used for processing prestress physical signals self-sensed by the intelligent steel strand, converting prestress light wave signals transmitted by the data acquisition and transmission module into prestress tendon tensioning force, and classifying and storing the processed data. According to the invention, real-time numerical values and loss conditions of prestressing forces of multiple sections of the high-speed rail box girder can be monitored, and the safety and reliability of the high-speed rail box girder are ensured.

Description

technical field [0001] The invention belongs to the field of civil engineering intelligent monitoring, and relates to a high-reliability real-time monitoring system and method for steel strand prestressed construction of a high-speed railway box girder. Background technique [0002] The prestressed concrete box girder is an important component of high-speed railway bridges. The actual prestress size and loss of its steel strands directly affect the safety and reliability of the box girder. However, in actual engineering, it is found that prestressed concrete shrinkage, creep, thermal strain, relaxation of prestressed tendons, corrosion of steel bars, deformation of paving and many other factors will lead to prestress loss. Especially for steam-cured box girders in winter, the cold external environment and high-temperature and high-humidity steam-cured atmosphere will inevitably have a certain impact on the prestress, so it is necessary to propose a scientific and convenient ...

AI Technical Summary

Problems solved by technology

However, in actual engineering, the channels of prestressed tendons are often curved, and the tortuous friction of the channels and various artificial construction factors lead to a certain deviation between the prestress size of each section inside the box girder and the theoretical calculation results, so only the two ends are controlled There are certain limitations in the magnitude of the tension applied

Second, there are two methods of destructive testing and non-destructive testing for steel strand tension testing. The destructive testing methods include intelligent reverse pull method and stress release method. These methods will cause damage to the prestressed beam body. and can only detect local areas

Non-destructive testing methods include ultrasonic technology testing method and equal mass method. These two methods will not cause damage to the beam body, but they can only collect data on the prestress under the anchor.

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