Monitoring method of long-period working state of optical fibre grating anchor wire and its equipment
A fiber grating and working state technology, which is applied in the direction of measuring devices, using optical devices, and using optical devices to transmit sensing components, etc., can solve the problems of harsh working conditions, low sensitivity, poor stability effects, etc., to ensure long-term stability and Safety, long-term stability, and long-distance transmission
Inactive Publication Date: 2003-03-05
WUHAN WUTOS
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Problems solved by technology
However, these two measurement methods cannot fully understand the stress distribution state of the steel strand of the anchor cable, and the long-term monitoring has poor stability and low sensitivity. Changing rock and soil, the anchor cable is buried in the rock and soil, and the working conditions are very harsh, so the requirements for the sensor's waterproof, moisture-proof, crack-proof, and anti-corrosion are high
This brings great difficulties to the monitoring and research of the anchor cable, and directly affects the reliability and service life of the instrument
On the other hand, the damage mechanism of the anchor cable is complex, and there is no anchor cable monitoring instrument that can fully reflect this damage mechanism
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[0013] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0014] figure 1 It is a schematic diagram of the production and sensing principle of the fiber grating sensing monitoring device. The basic composition of the fiber grating sensing and monitoring device for the long-term working state (stress, strain) of the anchor cable (bolt) of the present invention is to write the optical fiber grating that can match the deformation of the anchor cable into an optical fiber prefabricated part for protection In the process, the optical fiber prefabricated part is stranded in the steel strand as a rope core; or embedded in the outer steel strand of the anchor cable (using the small groove between the two strands of steel wire to protect the optical fiber). Specifically, the wavelength of each measuring point of the FBG at the corresponding position should be determined according to the strain distribution of the anch...
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Abstract
The invention is a method to monitor the long-period working state of anchorage cable in which fiber-optical grating is planted. Multiple quasi-distributional fiber-optical grating respectively sensestress strain of each distributional point in the anchorage cable strand to make the reflecting light wavelength change and then come out through the transmission fiber-optical from the measuring spot; the demodulator detects the magnitude of its wavelength change and then converts this to electric signal sent to the quadratic instrument which calculates the magnitude of the stress strain as wellas the whole distributional state of the anchorage cable. The equipment includes multi-point distributional fiber-optical gratings, transmission fiber-optial, demodulator of fiber-optical grating andquadratic instrument.
Description
technical field [0001] The invention relates to a signal detection technology, in particular to a method and a device for monitoring the long-term working state of a fiber grating anchor cable. Background technique: [0002] In water conservancy, hydropower, construction, transportation and other industries, prestressed anchoring technology is now widely used to solve key technical problems in engineering. The so-called prestressed anchorage (anchor cable) technology is to turn high-strength steel, steel wire, and steel strand into a tensioned structure under high stress for a long time through a special process, thereby enhancing the strength of the reinforced rock mass and improving the stability of the rock mass. Stress state, improve the stability of rock mass. At present, prestressed anchorage technology has been widely used in the fields of underground cavern surrounding rock reinforcement, slope engineering reinforcement, structural anti-overturning and deep foundati...
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Login to View More IPC IPC(8): G01B11/16G01D5/26G01L1/24G02B11/24
Inventor 周祖德梁磊王立新何伟胡文彬姜德生
Owner WUHAN WUTOS