Method for measuring stress of cable fence type flexible safety fence by using fiber Bragg gratings
A flexible guardrail and stress monitoring technology, which is applied in the measurement of the change force of the optical properties of the material when it is stressed, can solve problems such as difficult to achieve long-term stable measurement
Inactive Publication Date: 2012-12-05
KUNMING UNIV OF SCI & TECH
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Problems solved by technology
This method only considers using the resistance strain gauge to obtain the off-axis strain of the steel strand, but does not measure the axial strain of the steel strand; moreover, the resistance strain gauge is a relative measurement method, which obtains the change of the measured parameter, and the system restarts It is difficult to achieve long-term stable measurement after recalibration of the measurement base point
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[0038] See figure 1 , Paste the optical fiber Bragg grating 8 on the uppermost adjusting rod bolt 7 of the flexible guardrail connected to the end column 1, and keep the position of the paste in a non-contact state with the column and the cable end anchor head; Bragg another optical fiber The grating 4 is pasted on the single-stranded steel wire gap of the top cable guardrail 3, the pasting direction is parallel to the twisting direction of the steel wire, and the pasting position is kept at a distance from the cable end anchor head; the two-fiber Bragg gratings 4 and 8 pass through The optical fibers 5 and 9 are optically connected with the signal processing device 10 to monitor the off-axis strain and axial strain of the steel strand.
[0039] 1. Cable end anchor head of wire fence cable guardrail: The diameter of the adjusting rod bolt is 25mm, and the total length is 1200mm.
[0040] 2-wire cable guardrail cable: choose a three-strand seven-core right-handed same-twist structu...
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Abstract
The invention relates to technology for measuring the stress of a cable fence type flexible safety fence, in particular to a method for measuring the stress at the anchored end of the cable fence type flexible safety fence by using fiber Bragg gratings, which belongs to the technical field of photoelectron measurement. The method comprises the following steps: adhering one fiber Bragg grating to an adjustment stay bolt of the flexible safety fence connected with an end upright post in a way that intervals are reserved between a bonding position and the upright post and between the bonding position and an anchored cable end tip; adhering another fiber Bragg grating to a gap of a single-stranded steel wire of a cable fence in a way that a bonding direction is parallel to the spinning direction of the steel wire and the interval is reserved between the bonding position and the anchored cable end tip; and then optically connecting the two fiber Bragg gratings with a signal processing device through fibers to monitor the off-axis strain and axial strain of steel stranded wires. The method has the advantages of simple structure and accurate measurement; and through the method, the off-axis strain and axial strain of the cable fence can be simultaneously monitored and long-term measurement can be easy to realize.
Description
Technical field [0001] The invention relates to a stress measurement technology of a wire fence type flexible guardrail, in particular to a fiber Bragg grating measurement method for the stress of the anchor end of the wire fence type flexible guardrail. It belongs to the field of photoelectronic measurement technology. Background technique [0002] Safety isolation facilities are commonly used in expressways, cable guardrails have the advantages of good flexibility and anti-collision performance and strong impact energy absorption. However, the cable guardrail structure itself and the characteristics of large internal initial tension after erection have the following hidden dangers in safety: When the cable is loose, it will be disengaged when it is subjected to a large force, for example, when a car crashes at a high speed, it will not be able to reach the original The protective effect. The cable guardrail is longer and has more changes. It is difficult to judge whether the ...
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IPC IPC(8): G01L1/24
Inventor 李川李天星
Owner KUNMING UNIV OF SCI & TECH