Method used for testing stability of foundation of fan suspended in road tunnel and system therefor

Abstract

The invention discloses a method used for testing the stability of the foundation of a fan suspended in a road tunnel and a system therefor, which is characterized in that the method comprises the three steps of acquiring standard reference information, acquiring detection information and judging comparison, wherein the information in the judging comparison refers to the time domain waveform, thefrequency spectrum and the variation tendency of a signal generated by the vibration situation detected by the fan in the whole process from starting to steady running; and the system comprises a vibrating sensor, a signal amplification circuit, a filter circuit, a sample circuit, a CPU central controller, a keyboard module, a display, a data storage unit and an analysis processing computer. The invention has the obvious effects that the failure condition of a welded bracket can be detected, the loosening condition between a precast steel plate and a precast reinforcement as well as between the precast reinforcement and concrete can also be detected, the fan does not need to be detached in the testing process, the running of equipment is not affected, the principle of the system is simple, the production cost is low, the test operation is simple and convenient, and the result is reliable and visualized.

Description

technical field [0001] The invention relates to the field of stability detection of suspension equipment, in particular to a method and system for foundation stability detection 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 2008, 1,961 highway tunnels with a length of 1,102,871 meters had been built in the western region alone, including 50 extra-long tunnels with a length of 240,198 meters and 217 long tunnels with a length of 362,684 meters. Long road tunnels are generally equipped with mechanical ventilation devices, and more than 95% of them use suspended jet ventilation, so the stability of the suspended jet fan foundation has increasingly been highly valued by people. [0003] like 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 pl...

AI Technical Summary

Problems solved by technology

[0005] However, there are defects in various existing detection methods: (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 also 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) Radiographic flaw detection is used. In theory, this method mainly detects the reliability of the connection between the embedded steel plate and the mounting bracket, but in fact it is difficult to detect the reliability of the connection between the embedded steel plate and the embedded steel bar , and cannot detect looseness between embedded steel bars and concrete

(3) From the current application situation, magnetic particle flaw detection mainly detects the damage of welding brackets. Similar to radiographic flaw detection, it cannot detect the damage of the most critical embedded parts.

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