CN103411713B - Wide range is based on the reinforcing steel corrosion monitoring sensor of fiber grating sensing technology - Google Patents
Wide range is based on the reinforcing steel corrosion monitoring sensor of fiber grating sensing technology Download PDFInfo
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Abstract
The invention discloses the reinforcing steel corrosion monitoring sensor of a kind of wide range based on fiber grating sensing technology, it comprises: the covering of the fan perpendicular to reinforcing bar axis to be measured be made up of the fan-shaped backing plate of internal layer and the fan-shaped backing plate of skin, the optical fiber with at least one section of responsive grating and elastoplast shell, described plastic casing be arranged at the covering of the fan that the fan-shaped backing plate of internal layer and the fan-shaped backing plate of skin are formed two outside.Optical fiber low-light grating steel bar corrosion strain gauge of the present invention has long-time stability in marine corrosion environment, the size of tested steel bar corrosion differential expansion stress and the time overall process of concrete component cracking can be monitored when not affecting chloride permeability effect, overcome prior art self energy and monitor early stage steel bar corrosion situation, the shortcoming of corrosion differential expansion stress cannot be measured, for scientific research and routine servicing job acceptance decision provide objective foundation and detailed data, remote monitoring can be realized, precision is high, good reliability.
Description
Technical field
The present invention relates to a kind of strain gauge, belong to sensor technical field, especially belong to the strain gauge being applied to civil engineering work detection technique field.
Technical background
Steel bar corrosion expands and causes concrete cracking structural failure, affects works use safety, and steel bar corrosion is difficult to find latent period, should take reclamation activities as early as possible after concrete cracking, but concrete cracking is often also not easy to find.Reinforced concrete durable limit state is defined as: initially cause concrete cracking to arrive certain degree to steel bar corrosion, for prestressed concrete: initial to steel-bar corrosion, therefore in reinforced concrete building, the time point of (especially under villiaumite system environment) steel-bar corrosion is very important, is the key point of durability Design; After reinforcing bar rust to the time (T1) of cracking also concerning also very crucial durability Design, be parameter important in durability Design.
Traditional sensors employing resistance strain gage or vibratory string frequency measurement strain, strain and displacement, sensors with auxiliary electrode needs wire to connect, be embedded in concrete and easily occur short circuit, general survival rate is lower, in rugged surroundings, serviceable life is short, and be therefore badly in need of a kind of long-time stability good, measuring accuracy is high, measurement range is large, and easy for installation and energy overall process detects the sensor of steel bar corrosion expansive concrete cracking overall process.
The current also useful device utilizing fiber-optic monitoring steel bar corrosion, such as: publication number is CN102095677A, publication date is on June 15th, 2011, denomination of invention is that the Chinese invention patent application of a kind of method for monitoring corrosion cracks of reinforced concrete and sensor discloses a kind of method for monitoring corrosion cracks of reinforced concrete based on Distributed Optical Fiber Sensing Techniques, the reinforcing bar utilizing sensor internal to bury underground and stainless steel section, the reinforcing bar initial corrosion time is judged by its polarization current of electrochemical workstation periodic detection, the sensor fibre around arrangement of reinforcement utilizing sensor internal to lay, by the fibre strain of Distributed Optical Fiber Sensing Techniques Real-Time Monitoring, and infer that reinforced concrete is in the rust swollen or rust crack stage, judge the swollen or rust crack degree of rust by calibration curve simultaneously.But in this invention under reinforcing bar differential expansion stress optical fiber deformed in tension, because optical fiber elastic modulus is high, can only be used for monitoring early stage steel bar corrosion, and the later stage expands due to steel bar corrosion, easily causes optical fiber to be pulled off, therefore general range is little.
Summary of the invention
The object of the invention is to solve the problem, overcome the deficiency of traditional sensors in prior art, a kind of steel bar corrosion strain gauge in humidity even briny environment with long-time stability, wide range is provided.
In order to achieve the above object, present invention employs following technical scheme: a kind of wide range is based on the reinforcing steel corrosion monitoring sensor of fiber grating sensing technology, and it comprises:
The covering of the fan perpendicular to reinforcing bar axis to be measured be made up of the fan-shaped backing plate of internal layer and the fan-shaped backing plate of skin, the inner ring of the fan-shaped backing plate of internal layer is surrounded on the periphery of reinforcing bar to be measured, leaves radial play between internal layer fan-shaped backing plate outer ring and the fan-shaped backing plate inner ring of skin; And
With the optical fiber of at least one section of responsive grating, described responsive grating is wrapped by metal sleeve, described metal sleeve radial direction is fixed between the fan-shaped backing plate of internal layer and the fan-shaped backing plate of skin, described optical fiber two ends extend to outside outer fan-shaped backing plate and are connected with external signal processing unit, and the part between two ends is that round and smooth arc-shaped bend is fixed on the fan-shaped backing plate of internal layer and the fan-shaped backing plate inside of skin; And
Elastoplast shell, described plastic casing be arranged at the covering of the fan that the fan-shaped backing plate of internal layer and the fan-shaped backing plate of skin are formed two outside.
In order to make uniform stressed after sensor pressurized, described responsive grating has two sections, is wrapped respectively and the center line of the covering of the fan formed relative to the fan-shaped backing plate of internal layer and the fan-shaped backing plate of skin is symmetrical arranged by metal sleeve.
The fan-shaped backing plate of described internal layer is formed by two pieces of fan-shaped half backing plate overlaps of internal layer, the fan-shaped backing plate of described skin is formed by two pieces of fan-shaped half backing plate overlaps of skin, the overlying contact face of two pieces of fan-shaped half backing plates of internal layer or two pieces of fan-shaped half backing plates of skin offers groove respectively, when after two pieces of fan-shaped half backing plates of internal layer or two pieces of fan-shaped half backing plates of skin respectively split, described groove is configured as the passage passed for described metal sleeve and optical fiber.The object of this structure conveniently installs metal sleeve and optical fiber, can directly metal sleeve be folded between two-layer backing plate.
Two sections of responsive gratings are the responsive grating with different grid distance, can distinguish the spectrum that reflection frequency is different.
Described elastoplast shell is provided with the mounting hole be fixedly connected with the fan-shaped backing plate of skin with the fan-shaped backing plate of described internal layer; space after screw is fixed on mounting hole between screw and hole wall is filled with elastic gum; its Main Function is isolation concrete protective sensor; can metal sleeve be passed to after ensureing the fan-shaped half backing plate compression chord of internal layer, ensure the susceptibility of sensor.
Described sensor also comprises and is fixed on steel wire on tested reinforcing bar or nylon cable tie for bundling.
Preferably, the central angle of the fan-shaped backing plate of described internal layer or outer fan-shaped backing plate is 90 degree, can use multiple monitoring sensor simultaneously.
Further, described monitoring sensor is arranged in pairs on a certain cross section perpendicular to reinforcing bar axis to be measured, and Central Symmetry, to be applicable to different applied environments.
The present invention is by tested steel area profile design, expand after tested steel bar corrosion, fan-shaped half backing plate of pinch sensors internal layer, compressed metal sleeve pipe and the responsive grating position of optical fiber, change the space length of grating, reflected light frequency shift is converted into light signal, pass through Optical Fiber Transmission, far-end measuring can be realized, and precision is high, good reliability.Because optical fiber self has higher elastic modulus, under the condition of pressurized, distortion is little, therefore produce extrusion stress at steel-bar corrosion, until steel bar corrosion causes reinforcing bar surrounding concrete ftracture and produce the processes such as stress relaxation and all can monitor to a certain extent, therefore to have monitoring range large in the present invention, long-time stability, simple and reasonable, the advantage such as easy to install.
Compared to existing technologies, optical fiber low-light grating steel bar corrosion strain gauge of the present invention has long-time stability in marine corrosion environment, the size of tested steel bar corrosion differential expansion stress and the time overall process of concrete component cracking can be monitored when not affecting chloride permeability effect, overcome prior art self energy and monitor early stage steel bar corrosion situation, the shortcoming of corrosion differential expansion stress cannot be measured, for scientific research and routine servicing job acceptance decision provide objective foundation and detailed data, remote monitoring can be realized, precision is high, good reliability.
Accompanying drawing explanation
Fig. 1 is the structural representation of reinforcing steel corrosion monitoring sensor of the present invention along reinforcing bar direction.
Fig. 2 is the structural representation of reinforcing steel corrosion monitoring sensor of the present invention along steel area direction.
Fig. 3 is the cross section cut-away view that reinforcing steel corrosion monitoring sensor of the present invention is installed on reinforcing bar.
Fig. 4 is that reinforcing steel corrosion monitoring sensor of the present invention decomposes organigram, and it comprises each 2 pieces of fan-shaped half backing plate of inside and outside layer, each 2 pieces of elastoplast shell, the optical fiber being with fiber grating, metal sleeve, bolt and nut, steel wire
The fan-shaped half backing plate 1.1 metal sleeve groove 1.2 fiber grooves 1.3 mounting hole 1.4 outer fan-shaped half backing plate 2.1 metal sleeve groove 2.2 fiber grooves 2.3 mounting hole 2.4 responsive grating 3.1 second of optical fiber 3 first of outer fan-shaped backing plate 2 of internal layer fan-shaped backing plate 1 internal layer responsive grating 3.2 metal sleeve 4 Stud connection part 5 bolt 5.1 nut 5.2 plastic casing 6 shell pieces 6.1 mounting hole 6.2 steel wire 7 reinforcing bar 8
Embodiment
Below in conjunction with concrete accompanying drawing and embodiment, the invention will be further described.
As shown in figures 1-4 for being fixedly installed in the steel bar corrosion strain gauge of the present invention outside reinforcing bar, it comprises the covering of the fan perpendicular to reinforcing bar 8 axis, optical fiber 3, metal sleeve 4, elastoplast shell 6 and steel wire 7 etc. that the fan-shaped backing plate of internal layer 1 forms with the fan-shaped backing plate 2 of skin.
Wherein, the inner ring of the fan-shaped backing plate of internal layer 1 is surrounded on the periphery of reinforcing bar 8 to be measured, and the fan-shaped backing plate of internal layer and the fan-shaped backing plate of skin leave radial play.The fan-shaped backing plate of described internal layer 1 is formed by two pieces of fan-shaped half backing plate 1.1 overlaps of internal layer, the fan-shaped backing plate of described skin 2 is formed by two pieces of fan-shaped half backing plate 2.1 overlaps of skin, the surface of contact of two pieces of fan-shaped half backing plates 1.1 of internal layer is milled with corresponding fiber grooves 1.3 and metal sleeve groove 1.2 respectively, the surface of contact of two pieces of fan-shaped half backing plates 2.1 of skin is milled with corresponding fiber grooves 2.3 and metal sleeve groove 2.2 respectively, when two pieces of fan-shaped half backing plates 1.1 of internal layer and two pieces of fan-shaped half backing plates of skin are stacked together, groove after split is configured as the passage passed for described metal sleeve and optical fiber.
In this example, optical fiber 3 is with two sections of responsive gratings, i.e. the first responsive grating 3.1 and the second responsive grating 3.2, responsive grating is wrapped by metal sleeve 4, fixes between responsive grating and metal sleeve with epoxy resin.Optical fiber 3 bends along above-mentioned optical-fibre channel and is fixed on the fan-shaped backing plate of internal layer through outer fan-shaped backing plate 2 rear arc and extends outward from the other end of the fan-shaped backing plate of skin and be connected with external signal processing unit.Two sections of responsive raster grid space lengths are different, and therefore reflected light frequency is also different, can monitor two metal sleeve institute compression chord sizes simultaneously.Fibre-optical bending position least radius can not lower than the limits value of this material, in case increase light loss.
Elastoplast shell 6 is made up of identical two pieces of shape, be arranged at the covering of the fan that the fan-shaped backing plate of internal layer and the fan-shaped backing plate of skin are formed two outside.In order to assemble sensor, the fan-shaped backing plate of internal layer 1, outer fan-shaped backing plate 2 all offer relative mounting hole 1.4,2.4,6.2 with elastoplast shell 6, elastoplast shell is fixedly connected with the fan-shaped backing plate of inside and outside layer with nut 5.2 by bolt 5.1, hole is sentenced elastic gum and is filled, its fundamental purpose is to isolate concrete, ensure the susceptibility of sensor, the fan-shaped backing plate of internal layer 1 still can be subjected to displacement relative to arc backing plate 2 because steel bar corrosion expands after concrete curing.
Steel bar corrosion strain gauge is pricked 7 bands by steel wire or nylon and is fixed on tested reinforcing bar 8 simply in advance, then casting concrete.
As a kind of embodiment, described sensor arc backing plate 1,2 is 1/4 circular arc, namely central angle is 90 degree fan-shaped, different dimensions can be designed with according to the tested bar diameter of difference, fan-shaped half backing plate 1 of internal layer can be close to tested rebar surface, fix with steel wire or nylon cable tie 7, can used aloned also can multiple conbined usage.The steel that the fan-shaped backing plate of internal layer 1 and the fan-shaped backing plate of skin 2 adopt intensity higher, because the fan-shaped backing plate 2 of skin is by the restriction of outer concrete, under the effect of tested reinforcing bar 8 differential expansion stress, only there is relative displacement between the fan-shaped backing plate of inside and outside layer and excessive elastic deformation or bending does not occur.
In order to make tested reinforcing bar 8 differential expansion stress be converted to fiber grating 3.1,3.2 compressive strain, adopting between inside and outside two-layer backing plate 1,2 and accompanying metal sleeve 4, fiber grating 3.1,3.2 epoxy resin being fixed in metal sleeve 4, with metal sleeve 4 compatibility of deformation.
Steel bar corrosion strain gauge uses step as follows:
1. steel bar corrosion strain gauge steel wire 7 or nylon cable tie are fixed on reinforcing bar 8.
2. concrete blinding should arrange optical fiber fairlead, any position fiber bending radius should not be less than the limits value of this fiber optic materials, and optical fiber exposes after template part should be coiled to be protected with plastic sheeting parcel.
3. during deposit concrete, notice that the position of pour point away from position, sensor place, should be sure not just to tilt on a sensor concrete, prevent from sensor to be subjected to displacement or rotate even destroying.
4. when vibrating, vibrating spear is avoided coming in contact with sensor or optical fiber, should keep the distance of more than 200mm.
5. note the integrality protecting optical fiber during form removable, prevent from destroying optical fiber.
6. adopt fiber grating spectrograph scanning optical fiber reflected light or projection light frequency, thus the size of differential expansion stress suffered by determination sensor.
Claims (5)
1. a wide range is based on the reinforcing steel corrosion monitoring sensor of fiber grating sensing technology, it is characterized in that comprising: the covering of the fan perpendicular to reinforcing bar axis to be measured be made up of the fan-shaped backing plate of internal layer and the fan-shaped backing plate of skin, the inner ring of the fan-shaped backing plate of internal layer is surrounded on the periphery of reinforcing bar to be measured, leaves radial play between internal layer fan-shaped backing plate outer ring and the fan-shaped backing plate inner ring of skin; And
There is with two sections the optical fiber of the responsive grating of different grid distance, described responsive grating is wrapped by metal sleeve respectively, described metal sleeve radial direction is fixed between the fan-shaped backing plate of internal layer and the fan-shaped backing plate of skin and the center line of the covering of the fan formed relative to the fan-shaped backing plate of internal layer and the fan-shaped backing plate of skin is symmetrical arranged, described optical fiber two ends extend to outside outer fan-shaped backing plate and are connected with external signal processing unit, part between two ends is that round and smooth arc-shaped bend is fixed on the fan-shaped backing plate of internal layer and the fan-shaped backing plate inside of skin, the fan-shaped backing plate of described internal layer is formed by two pieces of fan-shaped half backing plate overlaps of internal layer, the fan-shaped backing plate of described skin is formed by two pieces of fan-shaped half backing plate overlaps of skin, the overlying contact face of two pieces of fan-shaped half backing plates of internal layer or two pieces of fan-shaped half backing plates of skin offers groove respectively, when after two pieces of fan-shaped half backing plates of internal layer or two pieces of fan-shaped half backing plates of skin respectively split, described groove is configured as the passage passed for described metal sleeve and optical fiber, and
Elastoplast shell, described plastic casing be arranged at the covering of the fan that the fan-shaped backing plate of internal layer and the fan-shaped backing plate of skin are formed two outside.
2. wide range according to claim 1 is based on the reinforcing steel corrosion monitoring sensor of fiber grating sensing technology, it is characterized in that: described elastoplast shell is provided with the mounting hole be fixedly connected with the fan-shaped backing plate of skin with the fan-shaped backing plate of described internal layer, and the space after screw is fixed on mounting hole between screw and hole wall is filled with elastic gum.
3. wide range according to claim 1 is based on the reinforcing steel corrosion monitoring sensor of fiber grating sensing technology, it is characterized in that: described monitoring sensor also comprises and is fixed on steel wire on tested reinforcing bar or nylon cable tie for bundling.
4. wide range according to claim 1 is based on the reinforcing steel corrosion monitoring sensor of fiber grating sensing technology, it is characterized in that: the central angle of the fan-shaped backing plate of described internal layer or outer fan-shaped backing plate is 90 degree.
5. wide range according to claim 1 is based on the reinforcing steel corrosion monitoring sensor of fiber grating sensing technology, it is characterized in that: described monitoring sensor is arranged in pairs on a certain cross section perpendicular to reinforcing bar axis to be measured, and Central Symmetry.
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| CN113483928B (en) * | 2021-07-21 | 2024-09-17 | 大连理工大学 | Intelligent clamp for monitoring rust expansion force of steel bars in concrete |
| CN114754911A (en) * | 2022-04-06 | 2022-07-15 | 曹桂忠 | Coal mine tunnel roof stress detector based on fiber grating sensor |
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