On-line detection method and system for foundation stability of tunnel suspended fan based on pressure measurement displacement

Abstract

The invention discloses an online detection method for foundation stability of a tunnel suspended fan based on pressure measurement displacement, which specifically includes: setting a pressure sensing module under a pre-embedded steel plate; The collected pressure information is proportional to the distance of the embedded steel plate from the foundation; when the actual distance is greater than the standard reference distance, it is judged that the embedded steel plate foundation is loose. The present invention can continuously monitor for a long time, and as long as the foundation of the embedded part becomes loose, there will be significant difference in the detected pressure. The monitoring process does not affect the operation of the equipment at all. The principle of the system to realize the method is simple, the cost is low, the operation is simple, the test results are intuitive and reliable, and it meets the needs of ensuring the safe operation of the highway tunnel.

Description

technical field [0001] The invention relates to the field of stability monitoring of suspension equipment, in particular to a method and system for on-line monitoring of foundation stability of a tunnel suspension fan. 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. 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] 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 generate certain vibration...

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) 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 the looseness between concrete

(3) The test method published in patent 201010115147.7 requires high equipment cost and requires rich experience of test personnel. This method is mainly used for regular testing of tunnel suspension fan foundations

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