Large-range steel corrosion monitoring sensor based on fiber Bragg grating sensing technology
A technology for monitoring sensors and optical fiber gratings, which is applied in the field of sensors, can solve problems such as high elastic modulus of optical fibers, broken optical fibers, and small measuring range, and achieve the effects of high precision, good reliability, and simple and reasonable structure
Active Publication Date: 2015-12-02
CCCC FOURTH HARBOR ENG INST +3
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Problems solved by technology
However, in this invention, the optical fiber is stretched and deformed under the expansion stress of the steel bar. Due to the high elastic modulus of the optical fiber, it can only be used to monitor the corrosion of the steel bar in the early stage, and the fiber is easily broken due to the corrosion and expansion of the steel bar in the later stage. Therefore, the general measurement range is not large.
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[0030] As an implementation, the arc backing plates 1 and 2 of the sensor are 1 / 4 arc-shaped, that is, a sector with a central angle of 90 degrees, which can be designed with different dimensions according to different diameters of steel bars to be measured. The half backing plate 1 can be close to the surface of the steel bar to be tested, fixed with a steel wire or a nylon cable tie 7, and can be used singly or in combination. The inner fan-shaped backing plate 1 and the outer fan-shaped backing plate 2 are made of high-strength steel. Since the outer fan-shaped backing plate 2 is limited by the external concrete, under the action of the expansion stress of the steel bar 8 to be tested, the inner and outer fan-shaped backing plates Only relative displacement occurs between them without excessive elastic deformation or bending.
[0031] In order to convert the expansion stress of the measured steel bar 8 into the compressive strain of the fiber grating 3.1, 3.2, a metal sleev...
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Abstract
The invention discloses a large range reinforcing steel corrosion monitoring sensor based on fiber bragg grating sensing technology. The sensor comprises a sector which is formed by an inner layer fan-shaped backing plate and an outer layer fan-shaped backing plate and is perpendicular to the axis of a reinforcing steel to be detected, a fiber with at least one section of sensitive grating and an elastic plastic shell. The plastic shell is arranged at two outer sides of the sector which is formed by an inner layer fan-shaped backing plate and an outer layer fan-shaped backing plate. A fiber micro grating type reinforcing steel corrosion stress sensor of the invention has long-term stability in a marine corrosion environment, the size of the corrosion expansion stress of a detected reinforcing steel and the time process of concrete member cracking are monitored in the condition that a chlorine ion penetration effect is not affected, a defect that the early reinforcing steel corrosion can not be monitored and the corrosion expansion stress can not be measured in the prior art is overcome, an objective basis and detailed data are provided for scientific research and daily maintenance decision, the remote monitoring can be realized, the precision is high, and the reliability is good.
Description
technical field [0001] The invention relates to a stress sensor, which belongs to the technical field of sensors, in particular to a stress sensor applied in the technical field of civil engineering detection. technical background [0002] The corrosion and expansion of steel bars lead to the structural damage of concrete cracks, which affect the safety of structures. It is difficult to find the latent period of steel bar corrosion. Repair measures should be taken as soon as possible after concrete cracks, but concrete cracks are often not easy to find. The limit state of durability of reinforced concrete is defined as: from the initial stage to the corrosion of steel bars, the concrete cracks to a certain extent, for prestressed concrete: from the initial stage to the beginning of corrosion of steel bars, so the steel bars in reinforced concrete buildings (especially in chloride-salt polluted environments) begin to corrode The time point is very important, and it is the key...
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IPC IPC(8): G01L1/24
Inventor 熊建波岑文杰王胜年黄君哲汤雁冰范志宏
Owner CCCC FOURTH HARBOR ENG INST