High-precision pile body omnibearing monitoring method based on fiber bragg grating

Abstract

The invention relates to a high-precision pile body omnibearing monitoring method based on a fiber bragg grating. The high-precision pile body omnibearing monitoring method can be used for monitoringpile body inclination, pile body displacement and movement directions. The monitoring method adopts a fiber bragg grating sensing technology, is based on a device of the invention. The device is mainly composed of an ABS rigid pipe, a threaded fixing piece, a threaded connecting rod and a fiber bragg grating inclination angle sensor, and can sense the inclination degree of a pile body; meanwhile,fiber bragg gratings FBG1 and FBG2 in a sensor are pulled and pressed, the distance between the gratings changes and causes drifting of the center wavelength, and an inclination angle of the pile body, the pile body displacement and the movement direction are obtained through demodulating a wavelength value. The high-precision pile body omnibearing monitoring method has the advantages that the mounting is simple, the manufacturing cost is low, a measuring range of the inclination angle ranges from -7 to +7 degrees, a measuring range of an azimuth angle ranges from 0 to 360 degrees, the measuring precision can reach 0.01 degree, the maximum value of horizontal displacement measurement is 120 mm, and the horizontal displacement resolution can reach 0.25 mm.

Description

Technical field

[0001] The invention relates to a monitoring method based on a fiber grating for high-precision monitoring of the full range of a pile body. Background technique

[0002] The traditional tilt monitoring method is to use a digital level to measure, which is not only complicated in operation, low in efficiency, and poor in accuracy. The electronic inclinometer devices in the prior art are mostly aimed at lateral displacement monitoring of landslide areas and deep tunnel excavated soils, as well as dam lifting structure deformation monitoring, ground displacement monitoring, etc. They are not specifically developed for piles. Summary of the invention

[0003] The invention provides a method for high-precision monitoring of the omni-directional pile body based on fiber grating;

[0004] The existing electronic inclinometer needs to install the inclinometer tube in the vertical borehole of the component, and calculate the inclination of the component by observing the def...

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