Fiber anchor pole corrosion sensor

A technology of corrosion sensors and bolts, applied in the field of geotechnical engineering, to achieve the effect of convenient layout, low cost and clear principle

Inactive Publication Date: 2013-09-25
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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However, at present, there are relatively few studies in this area

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Embodiment Construction

[0021] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0022] The structure of the optical fiber bolt corrosion sensor includes: an optical fiber corrosion expansion monitoring unit, an optical fiber grating temperature compensation unit and an optical fiber grating stress correction unit. Among them, the optical fiber corrosion expansion monitoring unit is the core component of the sensor, which is composed of a porous medium cushion, a bare optical fiber winding layer, a cement mortar protective layer and an armored signal transmission optical cable.

[0023] Since the root of the anchor rod is prone to rust, such as figure 1 , place the sensor at the root of the bolt. Firstly, a cylindrical cement mortar cushion layer with a thickness of 20-30mm and a length of 50mm is made using a mold. In specific applications, the location of the sensor and the thickness and len...

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Abstract

A fiber anchor pole corrosion sensor, belongs to a geotechnical engineering technology field. The fiber anchor pole corrosion sensor is characterized in that: the sensor is composed of a fiber corrosion expansion monitoring unit, a fiber grating temperature compensating unit and a fiber grating stress correction unit in layers, wherein the fiber corrosion expansion monitoring unit, which is a key component, is composed of a porous medium cushion layer, a bare fiber winding layer, an externally-coated cement mortar protective layer and an armoured signal transmission optical cable. The optical fiber is wound on a steel bar anchor pole and a steel strand anchor pole, protective layers are internally and externally arranged, radial expansion strain of the anchor pole caused by corrosion is measured, and quantitative monitor of corrosion degree of an anchor pole steel bar or a steel strand is implemented. The invention provides an anchor pole corrosion monitoring sensor which has advantages of clear principle, high measurement precision, low cost and high endurance, and the anchor pole corrosion monitoring sensor can implement long-term and stable quantitative monitor on a corrosion state of the anchor pole, and makes sure structural safety of the anchor pole.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and relates to the corrosion monitoring of steel bars and steel strand anchors, in particular to the strain monitoring technology of optical fiber sensing. The optical fiber is wound on the anchor, and the corrosion of the anchor is measured. The expansion strain can be used to quantitatively monitor the corrosion degree of the anchor bar or steel strand. Background technique [0002] As an economical and effective way of slope and roadway support, anchors have been widely used in engineering, and steel bar and steel strand anchors are two common types of anchors. Since the 1960s, anchor rods have been widely used in many railway tunnels, national defense and civil air defense tunnels, underground power plant buildings, high rock and soil slopes, port bank slopes, bridge pier culverts and foundation pits in China. With the increase of the service life, the anchor rod has become ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
Inventor 赵雪峰孙长森李冬生巴勤欧进萍
Owner DALIAN UNIV OF TECH
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