Underground Sensor Network and Its Deployment Method for Highway Life Monitoring

Abstract

The invention discloses an underground sensor network used for expressway life monitoring and a deployment method thereof. The underground sensor network comprises sensing measuring devices, a raster demodulating device, fiber-optic connecting devices, and communication and storage devices. The sensing measuring devices mainly comprise a horizontal strain sensor, a vertical strain sensor, a temperature sensor, and a soil pressure gage. The raster demodulating device comprises a fiber bragg grating demodulation instrument. The fiber-optic connecting devices comprise a fiber junction box, a fiber terminal box, and outdoor optical cables. The communication and storage devices comprise a computer, and a GPRS module. Through embedding fiber bragg grating sensors inside each structural layer of a road, road structure is monitored in a dynamic manner in real time, so that problems that dynamic response of each structural layer of the road on traffic load are solved, difficulties of former monitoring are overcome, and real-time monitoring of road structural information is realized.

Description

technical field [0001] The invention belongs to the field of real-time monitoring of state information of each structural layer in the whole life cycle process of expressway, and specifically relates to the application of fiber grating sensing technology and GPRS wireless transmission technology in the process of expressway operation and maintenance to monitor the interior of the road structure under different environmental conditions. , Dynamic monitoring under traffic load. Background technique [0002] At present, asphalt pavement is the main pavement type of expressway, and its structure type is very different according to its design requirements and technical indicators. By 2020, my country will build a national highway network, and the total mileage of highways is expected to reach 100,000 kilometers. However, the continuous growth of traffic volume and serious overloading have caused many road asphalt pavements to have road surface diseases prematurely, such as rutti...

AI Technical Summary

Problems solved by technology

[0005] Furthermore, due to the long mileage of an expressway, it is necessary to select multiple monitoring sections along the line, and the selection of monitoring sections must be representative, such as straight line sections, long longitudinal slope sections, bridges and tunnels and other structural connections, etc. This results in a longer distance between the monitoring sections

The monitoring signal of each fiber grating sensor needs to be demodulated by a grating demodulator, but the cost of the grating demodulator is very expensive

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