CN113466115B - Steel bar corrosion monitoring device with temperature self-compensation function - Google Patents
Steel bar corrosion monitoring device with temperature self-compensation function Download PDFInfo
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- CN113466115B CN113466115B CN202110679018.9A CN202110679018A CN113466115B CN 113466115 B CN113466115 B CN 113466115B CN 202110679018 A CN202110679018 A CN 202110679018A CN 113466115 B CN113466115 B CN 113466115B
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Abstract
The invention relates to a steel bar corrosion monitoring device with temperature self-compensation function, which comprises a base, a first optical fiber Bragg grating and a second optical fiber Bragg grating, wherein the base is provided with a first optical fiber Bragg grating and a second optical fiber Bragg grating; the base is integrally of a cuboid structure, the upper surface of the base is of an arc structure matched with the surface of a steel bar, the base is internally provided with a hollow structure, the upper surface of an inner cavity of the base is uniformly provided with a plurality of rectangular grooves, the bottom parts of the two sides of the base are provided with rectangular through holes leading to the inner cavity, the two sides of the middle area of the lower surface of the inner cavity of the base are respectively pasted after the first optical fiber Bragg grating and the second optical fiber Bragg grating are connected, and one end of the first optical fiber Bragg grating is led out of fibers through the rectangular through holes. The invention can meet the requirement of long-term real-time monitoring of the corrosion of the steel bar under the concrete environment, is convenient to install, has good stability and adjustable sensitivity and measurement range, can carry out temperature self-compensation and has better economic benefit and social benefit.
Description
Technical Field
The invention relates to the technical field of optical fiber sensing, in particular to a steel bar corrosion monitoring device with temperature self-compensation function.
Background
The reinforced concrete structure combines the advantages of steel bars and concrete, has low manufacturing cost, and is widely applied to the projects such as bridges, buildings, roads, dams and the like. Besides ensuring safety and applicability, the structures also have the requirement of ensuring the durability of the structures. Among the various factors, steel reinforcement corrosion is the primary factor affecting the durability of concrete structures. Statistical data at home and abroad show that the loss caused by the reduction of the durability of a concrete structure due to the corrosion of steel bars is huge, the problem is more and more serious, and the corrosion of the steel bars brings huge loss to national economy. The 2000 year survey by the U.S. department of standards showed us direct corrosion losses of $ 4400 million, accounting for 5% of GDP, an increase of 48% over 1995, with 32% of transportation and public utilities and indirect losses of $ 8000 million. At present, the main method for detecting the corrosion of the steel bar is still an electrochemical method, and with the wide application of the optical fiber and the optical fiber grating detection technology, people begin to use the method for detecting the corrosion of the steel bar. The Fiber Bragg Grating (FBG) sensor for reinforcing steel bar corrosion is insensitive to environmental interference, is simple and quick to detect and has better durability, so the fiber bragg grating sensor is of great significance for researching the corrosion of the reinforcing steel bars in concrete.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a reinforcement corrosion monitoring device with temperature self-compensation, which can satisfy the requirements of long-term real-time monitoring of reinforcement corrosion in concrete, corrosion resistance, convenient installation, small volume, good stability, adjustable sensitivity and measurement range, and can perform temperature self-compensation, and has good economic and social benefits.
The technical scheme adopted by the invention is as follows:
the invention provides a steel bar corrosion monitoring device with temperature self-compensation, which comprises a base, a first optical fiber Bragg grating and a second optical fiber Bragg grating, wherein the base is provided with a first optical fiber Bragg grating; the base wholly is the cuboid structure, the upper surface of base sets up the circular arc structure who agrees with mutually with the reinforcing bar surface, the inside hollow out construction that sets up of base, the upper surface of base inner chamber evenly is provided with a plurality of rectangle flutings, the bottom is provided with the rectangle through-hole that accesss to the inner chamber in the base both sides, paste respectively in the regional both sides in base inner chamber lower surface middle part after first optic fibre Bragg grating and second optic fibre Bragg grating are connected, just first optic fibre Bragg grating one end is passed through the rectangle through-hole and is gone out the fibre.
Further, the first fiber Bragg grating and the second fiber Bragg grating are connected in series, the second fiber Bragg grating is completely positioned in the inner cavity, and a tail fiber of the first fiber Bragg grating penetrates out through the rectangular through hole; one end of the second fiber Bragg grating is fixed through gluing, the other end of the second fiber Bragg grating is in a loose state, two ends of the first fiber Bragg grating are pasted, and the first fiber Bragg grating is in a critical stretching state during pasting.
Furthermore, semicircular grooves are formed below the rectangular through holes in the two sides of the base and used for bonding stainless steel pipes, and the tail fibers of the first fiber Bragg gratings are protected.
Furthermore, a raised cross beam is arranged in the middle area of the bottom of the base.
Furthermore, EVA foam which corresponds to the area of the bottom of the base and is as high as the cross beam is filled on two sides of the cross beam.
Further, the base is made of dual-phase steel, nickel alloy or titanium alloy.
Compared with the prior art, the invention has the following beneficial effects:
1. the steel bar can be subjected to life cycle corrosion monitoring in a concrete environment;
2. the grating is corrosion-resistant, the base is made of corrosion-resistant materials or is subjected to film coating treatment, and the grating is corrosion-resistant;
3. the device is convenient to install, the grating can be directly bound on the surface of the steel bar, the grating cannot be damaged during concrete pouring due to the fact that the grating is arranged in the inner cavity of the base, and the steel bar bound with the monitoring device can be directly poured during construction;
4. the sensitivity is high, the volume of a corrosion product is much larger than that of a corroded steel bar when the steel bar is corroded, the contact surface of the device is extruded by the increase of the volume, the middle of the contact surface is hollow, the loose corrosion product enters the inner cavity of the base, so that the two ends of the contact surface of the base are stressed, the middle of the contact surface of the base is not stressed, and the middle of the base is provided with a raised cross beam which is similar to a pivot of a warped plate, so that the adhesion surface of the grating is strained, the grating is sensitive to strain, and the sensitivity of the device is determined;
5. The sensitivity and the measuring range are adjustable, the sensitivity of the device can be adjusted by adjusting the thickness of the grating pasting surface and the length of the devices on the two sides of the rectangular beam, the smaller the thickness is, the higher the sensitivity is, the longer the devices on the two sides of the rectangular beam are, the higher the sensitivity is, and the monitoring range of the device can be adjusted by adjusting the height of the rectangular beam;
6. the temperature self-compensation can be carried out, the two gratings are pasted in the inner cavity of the base, one grating is used as a sensing grating, and the other grating is used for carrying out temperature compensation.
Drawings
FIG. 1 is a schematic view of the overall assembly structure of the present invention;
FIG. 2 is a schematic side view of the structure of FIG. 1;
fig. 3 is a schematic structural diagram of a front view of the structure without EVA foam in fig. 1.
Wherein, the reference numbers: 1-a base; 2-rectangular through holes; 3-semicircular slotting; 4-EVA foam; 5-rectangular slotting; 6-a cross beam; 7-a first fiber Bragg grating; 8-a second fiber Bragg grating; 9-arc structure; 10-lumen.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
It should be noted that in the description of the present invention, it should be noted that the terms "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of describing the present invention and simplifying the description, but do not mean that a device or an element must have a specific orientation, be configured in a specific orientation, and be operated.
Referring to fig. 1 to 3, a concrete structure of an embodiment of a device for monitoring corrosion of steel reinforcement with temperature self-compensation according to the present invention is shown. The device comprises a base 1, a first fibre Bragg grating 7 and a second fibre Bragg grating 8.
The base 1 is integrally in a cuboid structure and is made of dual-phase steel, nickel alloy or titanium alloy materials, or the surface of the base is subjected to film coating treatment; the upper surface of the base 1 is provided with an arc structure 9 matched with the surface of a steel bar, the interior of the base 1 is provided with a hollow structure, the upper surface of an inner cavity 10 of the base is uniformly provided with a plurality of rectangular slots 5, and the middle bottom of two sides of the base 1 is provided with a rectangular through hole 2 leading to the inner cavity 10; semicircular slots 3 are correspondingly arranged below the rectangular through holes 2 at the two sides of the base 1; a raised cross beam 6 is arranged in the middle area of the bottom of the base 1, and EVA foam 4 which corresponds to the area of the bottom of the base 1 and is as high as the cross beam 6 is filled at two sides of the cross beam 6; when the reinforcing bar received the corruption, the volume of corrosion products will be far more than the volume of the reinforcing bar of corruption, the increase of volume will probably produce the extrusion to the device contact surface, owing to fretwork in the middle of the contact surface, loose corrosion products can get into base inner chamber 10, lead to 1 contact surface both ends of base to receive pressure, centre not atress, again because there is bellied crossbeam 6 in the middle of 1 bottom of base, this crossbeam 6 is equivalent to the fulcrum of wane, will make the grating paste the face produce and meet an emergency, the grating is sensitive to the variation, the sensitivity of device has been decided.
The first optical fiber Bragg grating 7 and the second optical fiber Bragg grating 8 are connected and then are respectively stuck to the front side and the rear side of the middle area of the lower surface of the inner cavity 10 of the base at a certain interval; in this embodiment, the first fiber Bragg grating 7 and the second fiber Bragg grating 8 are connected in series, the second fiber Bragg grating 8 is completely located in the inner cavity 10, and a tail fiber of the first fiber Bragg grating 7 passes through the rectangular through hole 2 on one side; one end of the second fiber Bragg grating 8 is fixed by gluing, the other end of the second fiber Bragg grating is in a loose state, two ends of the first fiber Bragg grating 7 are fixed by gluing, and the first fiber Bragg grating 7 is in a critical stretching state when the first fiber Bragg grating is pasted; the first fiber Bragg grating 7 is used as a sensing grating, and the second fiber Bragg grating 8 is used as a compensation grating for temperature compensation; and the semicircular slot 3 can be used for bonding a stainless steel pipe, so that the tail fiber of the first optical fiber Bragg grating 7 is protected.
The working principle of the invention is as follows: the upper surface of the 1 inner chamber of base evenly is provided with a plurality of rectangle fluting 5, rectangle fluting 5 is in order to let the better entering intracavity of corrosion that the corrosion of reinforcing bar produced, when the corrosion of reinforcing bar produced the corrosion, can produce very big power, the effect of rectangle fluting 5 is that the power when producing the corrosion of reinforcing bar in the middle of base 1 unloads a most part, and the power that makes the corrosion of reinforcing bar produce the corrosion is exerted in base 1 both sides. Rectangular through holes 2 leading to the inner cavity are formed in the bottoms of the two sides of the base 1, the first optical fiber Bragg grating 7 and the second optical fiber Bragg grating 8 are respectively adhered to the two sides of the middle area of the lower surface of the inner cavity of the base 1 after being connected, and one end of the first optical fiber Bragg grating 7 is led out of the optical fiber through the rectangular through holes 2. The first optical fiber Bragg grating is used as a strain sensing grating, the second optical fiber Bragg grating is used as a temperature compensation grating for temperature compensation, and the temperature compensation principle is as follows: the central wavelength of the fiber Bragg grating is sensitive to temperature and strain, when the second fiber Bragg grating 8 is in a relaxed state, the second fiber Bragg grating is not influenced by stress, the central wavelength only changes along with the change of the temperature, the central wavelength of the first fiber Bragg grating 7 changes along with the change of the stress and the change of the temperature, and the change of the central wavelength of the first fiber Bragg grating 7 is subtracted by the change of the second fiber Bragg grating 8 to obtain the change of the central wavelength of the first fiber Bragg grating 7 along with the change of the stress, so that the temperature compensation is realized. The middle area of the bottom of the base 1 is provided with a raised beam 6, the beam 6 acts as a pivot of a rocker, force generated by steel bar corrosion can be better applied to the grating adhering surface to enable the grating adhering surface to generate strain, EVA foam 4 which corresponds to the bottom area of the base 1 and has the same height as the beam is filled on two sides of the beam 6, and the purpose is to enable the two end points of the base 1 to generate axial displacement perpendicular to the steel bar when being stressed, so that the first optical fiber Bragg grating 7 generates tensile strain.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (5)
1. The utility model provides a steel bar corrosion monitoring devices with temperature self compensating which characterized in that: the device comprises a base, a first fiber Bragg grating and a second fiber Bragg grating; the base is integrally of a cuboid structure, the upper surface of the base is of an arc structure matched with the surface of a steel bar, the base is internally provided with a hollow structure, the upper surface of an inner cavity of the base is uniformly provided with a plurality of rectangular grooves, rectangular through holes leading to the inner cavity are formed in the bottoms of the two sides of the base, the first optical fiber Bragg grating and the second optical fiber Bragg grating are respectively adhered to the two sides of the middle area of the lower surface of the inner cavity of the base after being connected, and one end of the first optical fiber Bragg grating is led out of a fiber through the rectangular through holes;
a raised cross beam is arranged in the middle area of the bottom of the base.
2. The apparatus for monitoring corrosion of steel reinforcement with temperature self-compensation according to claim 1, wherein: the first optical fiber Bragg grating and the second optical fiber Bragg grating are connected in series, the second optical fiber Bragg grating is completely positioned in the inner cavity, and a tail fiber of the first optical fiber Bragg grating penetrates out through the rectangular through hole; one end of the second optical fiber Bragg grating is fixed through gluing, the other end of the second optical fiber Bragg grating is in a loose state, two ends of the first optical fiber Bragg grating are pasted, and the first optical fiber Bragg grating is in a critical stretching state during pasting.
3. The device for monitoring the corrosion of the steel reinforcement with the temperature self-compensation function according to claim 1, wherein: and semicircular grooves are formed below the rectangular through holes on the two sides of the base and used for bonding stainless steel pipes to protect tail fibers of the first optical fiber Bragg grating.
4. The apparatus for monitoring corrosion of steel reinforcement with temperature self-compensation according to claim 1, wherein: the two sides of the cross beam are filled with EVA foam which corresponds to the area of the bottom of the base and has the same height as the cross beam.
5. A steel reinforcement corrosion monitoring device with temperature self-compensation according to any one of claims 1-4, characterized in that: the base is made of dual-phase steel or nickel alloy or titanium alloy.
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| CN113959935B (en) * | 2021-11-02 | 2023-05-19 | 燕山大学 | Reinforcing steel bar corrosion monitoring device in reinforced concrete member |
| CN118225664B (en) * | 2024-03-12 | 2024-09-17 | 安徽建工交通智造有限责任公司 | Bridge supporting reinforcement corrosion degree detection device |
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