Impulse Response Based Stability Detection Method and System for Highway Tunnel Suspension Fan Foundation

Abstract

The invention discloses a highway tunnel hanging fan base stability detection method and a system based on impulse response, which relate to the technical field of hanging device stability detection. Through applying impulse excitation to an embedded steel plate of the hanging fan, time domain signals for excitation and response are processed respectively, a characteristic frequency is calculated according to single-degree-of-freedom structure amplitude frequency characteristics and phase frequency characteristics, and a stability recognition model based on multi-stage characteristic frequency is built. When the detection method is adopted to detect the highway tunnel hanging fan base stability, transfer function amplitudes corresponding to the former n-stage characteristic frequencies in m times of tests are subjected to weighted fusion calculation to judge the base stability. The detection method of the invention has the advantages that operation of equipment is not influenced completely; the huge fan does not need to be removed; the operation is simple; the stability condition of the embedded base can be accurately detected; the principle is simple; the test result is intuitive and reliable; and requirements of ensuring safety operation of the highway tunnel can be met.

Description

technical field [0001] The invention relates to the technical field of stability detection of suspension equipment, in particular to an impulse response-based detection method and system for the foundation stability of a suspension fan in a highway tunnel. Background technique [0002] With the rapid development of highway traffic in our country, a large number of highway tunnels have been built. By the end of 2013, my country's road tunnels had broken through the 10,000 mark. Highway tunnels are generally equipped with mechanical ventilation devices, and more than 95% of them use suspended jet ventilation, so the stability of the embedded foundation of suspended jet fans has been highly valued. [0003] Such as figure 1 As shown, the installation method of the jet fan is generally to pre-embed the steel plate on the tunnel vault, weld the steel plate to the pre-embedded steel bar, and then weld the fan mounting bracket to the steel plate. Since the fan is heavy and will ...

AI Technical Summary

Problems solved by technology

[0005] However, the existing detection methods all have defects: (1) for the pull-out test, because the fan is large in size and generally has a diameter of more than one meter, it is very difficult to operate the pull-out test under the condition that the fan has been installed, and the observation is also difficult. very difficult

If the fan is removed and the pull-out test is performed, the workload will be large and the test period will be too long

(2) Non-destructive testing is used to mainly detect the reliability of the connection between the embedded steel plate and the mounting bracket. In fact, it is difficult to detect the reliability of the connection between the embedded steel plate and the embedded steel bar, and it cannot detect the embedded steel bar and concrete looseness of the bond

Images