A bridge monitoring and evaluation method for bridges passing through high-speed railways under shield tunnel construction

Abstract

The invention discloses a bridge monitoring and evaluation method for a shield tunnel construction under-pass high-speed railway bridge. The method includes the steps of real-time data acquisition, data sorting, evaluation model establishment, data review and model evaluation result classification. According to the bridge monitoring and evaluation method for the shield tunnel construction under-pass high-speed railway bridge of the invention, after the structure of the bridge is partitioned, acquired data are monitored in real time through a fiber Bragg grating sensor, and the spatial transfercharacteristics of deformation can be visually described; data which can reflect the status of the structure of the bridge are calculated through data sorting; the sorted data are utilized to establish an evaluation model, and warning threshold values are set; data that exceed the warning threshold values are rechecked and confirmed, so that misjudgment can be prevented; and a model evaluation result is obtained according to the evaluation model. The monitoring and evaluation method of the invention has the advantages of comprehensive monitoring scope, high precision, high stability, high efficiency, low cost, and long service life of monitoring equipment, and is suitable for sensitive monitoring objects of large-scale projects and projects that require long-term real-time monitoring. With the method of the invention adopted, automatic remote monitoring can be realized, and the interference of online monitoring work on operating high-speed rails can be reduced.

Description

technical field [0001] The invention belongs to the field of on-site monitoring and evaluation of engineering construction safety, and in particular relates to a bridge monitoring and evaluation method for a bridge passing through a high-speed rail bridge under shield tunnel construction. Background technique [0002] The construction of high-speed rail bridges under tunnels may have adverse effects on the safety of bridge piers and girder structures. Keeping track of the health status of bridge structures is an important prerequisite for ensuring the safety of high-speed rail operations. High-speed railways have high frequency and high speed, and have high requirements for line deformation. The operation of high-speed railways has strict management and control over the deployment of monitoring equipment on beams and rails, which is highly sensitive. [0003] In the routine monitoring of bridges, instruments and equipment such as subsidence meters, inclinometers, total stati...

AI Technical Summary

Problems solved by technology

Implantable laying cannot be carried out for existing structures; for sensitive buildings or structures such as high-speed rail bridges, the use of adhesive fiber laying methods requires grooves or positioning on the monitoring objects, which may cause damage to the concrete protective layer of the track slab, and The adhesive may contaminate the track board. In addition, the adhesive may expand and contract due to changes in the ambient temperature, which may cause systematic errors in the optical fiber monitoring results.

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