Shield tunnel safety state monitoring and early warning device and monitoring and early warning method thereof

Abstract

The invention discloses a shield tunnel safety state monitoring and early warning device and a monitoring and early warning method thereof. The device comprises a measurement digital camera, a servo system, an inclination angle sensor, and an Mini industrial personal computer, wherein the measurement digital camera is used for shooting a target fixed on the tunnel side wall as an encoding point ina tunnel monitoring area, the servo system is used for carrying the measurement digital camera through mechanical transmission for shooting the same target at different designated positions, the inclination angle sensor is fixed on the side wall of the tunnel and is located at the periphery of the target and is used for measuring an inclination angle of the tunnel, the Mini industrial personal computer is used for controlling operation of the servo system, collecting photos taken by the measurement digital camera and tunnel inclination angels of the inclination angle sensor, performing deformation calculating, analyzing and evaluation, and comparing an evaluation result with a threshold table to perform graded early warning on a tunnel safety state. By means of the device, the tunnel is monitored in real time, the whole information of a tunnel section can be quickly acquired, the physical property of the structure is not damaged by using non-contact measurement, an automation degree of the whole process is high, the timeliness is high, and the operation is simple.

Description

technical field [0001] The invention relates to the technical field of tunnel detection, in particular to a shield tunnel safety state monitoring and early warning device and a monitoring and early warning method thereof. Background technique [0002] Tunnel deformation monitoring is a very important task in the tunnel construction process and subsequent operation period. The monitoring of tunnel deformation mainly refers to reflecting the deformation in a certain section of the tunnel by collecting relevant data in different periods of the tunnel and comparing the design values ​​at the same position in the tunnel. The monitoring of tunnel deformation is actually the method of detecting the tunnel section by using relevant instruments. [0003] The commonly used methods for deformation monitoring of shield tunnels include geodetic measurement and sensor measurement. Among them, the geodetic method is the most commonly used method for deformation monitoring. It mainly refe...

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Problems solved by technology

Among them, the geodetic method is the most commonly used method for deformation monitoring. It mainly refers to the use of levels and total stations to obtain the three-dimensional coordinates of monitoring points through angle and distance observations. However, the timeliness of deformation monitoring using geodetic methods is relatively poor. The cycle is relatively long, and the observation of multiple monitoring points cannot be completed in a short period of time; secondly, the requirements for lighting conditions and space conditions also limit its performance; in addition, when the total station performs high-precision measurement, it is generally necessary to install a prism. This is difficult to achieve in many cases

Sensor measurement methods, especially contact sensors, have become more and more widely used in the field of displacement and deformation measurement. Monitoring is mainly carried out by embedding it in the structure or installing it on the surface of the structure, but the sensor has some disadvantages when used for deformation monitoring: first, because the sensor must be buried in the structure or installed on its surface, it must be in contact with the structure. The physical properties of the structure may cause damage or cause a certain impact, and the installation process will also bring a lot of inconvenience to the project; secondly, the selective distribution of points for monitoring, in order to reflect the deformation and displacement of the structure in an all-round way, generally requires A large number of monitoring points are deployed, but usually the sensors can only be deployed in some key parts; in addition, the sensors are generally expensive, and one often costs several thousand yuan; in addition, there are reliability problems, because the sensor signals are affected by many factors when they are converted into displacements. The influence of external factors, resulting in distortion of the measurement results

[0005] The analysis of various existing testing equipment for shield tunnels shows that the manual measurement of the total station and the manual measurement of the tunnel inspection vehicle both require the construction skylight point, so the timeliness of the detection is poor, and when a serious disease suddenly occurs in the tunnel, it may be damaged. The occurrence of data lag affects the timely treatment of tunnel diseases

At the same time, the data analysis time of the tunnel inspection vehicle is long and the timeliness is poor

Static levels can only measure tunnel settlement, but cannot effectively measure tunnel convergence deformation and tunnel torsion, and the measurement effect is relatively simple

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