CN205352590U - Concrete structure thing stress and strain sensor - Google Patents
Concrete structure thing stress and strain sensor Download PDFInfo
- Publication number
- CN205352590U CN205352590U CN201620114124.7U CN201620114124U CN205352590U CN 205352590 U CN205352590 U CN 205352590U CN 201620114124 U CN201620114124 U CN 201620114124U CN 205352590 U CN205352590 U CN 205352590U
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- strain gauge
- epoxy resin
- concrete structure
- stress strain
- electrode
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Abstract
The utility model discloses a concrete structure thing stress and strain sensor, including the epoxy smart material base member, the epoxy smart material base member is inside lays a plurality of built -in electrodes according to setting for the interval, the atress surface parallel of built -in electrode and epoxy smart material base member, and the even parcel of epoxy smart material matrix surface has outside encapsulated layer, the built -in electrode is connected with external conductors, and it is outside that external conductors extends to outside encapsulated layer. The utility model discloses the sensor has fine compatibility with the concrete structure thing, can work jointly with the concrete structure thing. The utility model discloses the sensor stable performance, long service life, it is high to implant the survival rate, can be used for monitoring for a long time the concrete structure thing inner stress situation of meeting an emergency.
Description
Technical field
This utility model belongs to field of civil engineering, is specifically related to a kind of concrete structure stress strain gauge.
Background technology
In field of civil engineering, the tools such as works failure prediction, disaster alarm are of great significance by the stress of structure, strain monitoring, and the maintenance of works is had directive function.
Concrete material is most commonly used now and construction material widely.Concrete material has the advantages such as high intensity, high-modulus, high-durability, is obtained in civil engineering every field and is widely applied.And concrete is as a kind of fragile material, its destruction has mutability, and this makes its destruction have unpredictability, easily causes mass casualties and property loss.Thus for concrete structure, monitoring structural health conditions is particularly important.Way common at present is pre-buried sensor in concrete structure, such as electricity magnetostriction materials sensor, Fibre Optical Sensor etc., after the shortcoming of this kind of sensor is that the life-span is short, poor anti jamming capability, cost high and is implanted in concrete structure, survival rate is relatively low.Additionally, this kind of material is general and the concrete structure compatibility is not high, thus the performance of concrete structure self can be affected.
In concrete structure, also have and adopt cement-based material as the smart material of matrix to make sensor, this sensor has the disadvantage that: cement-based material itself can cause matrix to produce contraction fissure thus causing intrinsic silicon defect due to problems such as moisture losses, reduces the quality of sensor；Adopting cement-based material to make sensor to need to carry out long maintenance, the cycle is longer, uses inconvenience；Owing to cement-based material matrix exists the pore and internal flaw produced by moisture evaporation, its resistivity is vulnerable to the impact of moisture, sensor existence and stability problem.
And adopt the smart material composite construction with resin matrix composition as sensor, owing to constructing complexity, make loaded down with trivial details, be unfavorable for promoting the use of of sensor.
In prior art, generally often joining to improve its electric conductivity in the polymer such as epoxy resin by conductive filler, in the presence of a harsh environment, this composite as the succedaneum of metal material, can play electric action, can resist again the corrosion function of various environment.In field of civil engineering, frequently with epoxy resin as structural bond material or various coating, and this conductive filler being made up of conductive filler and epoxy resin is applied less in field of civil engineering.
Utility model content
The purpose of this utility model is for overcoming above-mentioned the deficiencies in the prior art, thering is provided a kind of concrete structure stress strain gauge, this sensor performance is reliable and stable, long service life and the concrete structure compatibility is good, it is simple to make, cost is low, bury simplicity underground, survival rate is high.This utility model adopts epoxy resin as matrix material, compared to cement based matrix material be in that a little solidify rapidly, the strength derived value time is fast, it is not necessary to long-time maintenance, and matrix material itself is without capillary structure, is not therefore subject to the impact of moisture；Sensor base provided by the utility model is made up of monoblock smart material, it is to avoid the structure that composite construction causes is complicated and makes loaded down with trivial details problem.This utility model utilizes the agility of epoxy resin-conductive filler composite, it can be used as a kind of sensor, refer to field of civil engineering, in order to monitor the stress-strain state of various civil structure thing, provide new approaches for epoxide resin material application in field of civil engineering.
For achieving the above object, this utility model adopts following technical proposals:
A kind of concrete structure stress strain gauge, including epoxy resin smart material matrix, described epoxy resin smart material intrinsic silicon lays some built-in electrodes by setting spacing, built-in electrode is paralleled with the stress surface of epoxy resin smart material matrix, and epoxy resin smart material matrix surface is uniformly enclosed with outer enclosure layer；Described built-in electrode is connected with external wire, and external wire extends to outside outer enclosure layer.
Described built-in electrode is that tinsel vertical interlaced in length and breadth arranges the fenestral fabric formed；The built-in electrode adopting this network-like structure is easy to make, and buries underground conveniently.There is between epoxy resin and most metals good adhesion strength, adopt tinsel to make fenestral fabric and be conducive to the globality of sensor as electrode.
Spacing between the portion transverse wire of described built-in electrode is equal with the spacing between vertical tinsel.
Preferably, the spacing between the portion transverse wire of described built-in electrode is 2～15mm；Spacing too conference reduces the effectiveness of electrode, and the too little meeting of spacing causes that sensor internal does not plan a successor, and affects the performance of sensor.
Preferably, the spacing between the vertical tinsel of described built-in electrode is 2～15mm；Spacing too conference reduces the effectiveness of electrode, and the too little meeting of spacing causes that sensor internal does not plan a successor, and affects the performance of sensor.
The diameter wiry forming described fenestral fabric is 0～1mm；The thick performance easily affecting sensor crossed by tinsel.
Described external wire includes tinsel wire, and described tinsel wire outer wrap has insulating barrier.
Described epoxy resin smart material matrix is made up of the mixture of epoxy resin and conductive nano filler；Conductive nano filler can adopt CNT and Graphene, adopts conductive nano filler can improve the performance of epoxy resin-base.The proportionate relationship of conductive nano filler and epoxy resin to be selected according to the kind of adopted epoxy resin and conductive nano filler, such as bisphenol A type epoxy resin and multi-walled carbon nano-tubes, conductive filler and epoxy resin are generally adopted the ratio of 0.5:100～10:100.
Described outer enclosure layer is made up of the epoxy resin cured product without conductive filler；The epoxy resin of outer enclosure layer and firming agent adopt the material type same with epoxy resin smart material matrix and mixed proportion, to ensure the coordinating and unifying of whole sensor.
The monitoring method of a kind of concrete structure stress strain gauge, comprises the following steps:
Step 1: the agility of epoxy resin smart material matrix is tested, draws the quantitative relationship that the rate of change of stress strain gauge resistance is stressed with stress strain gauge and strains；
Step 2: determine the position needing monitor stress to strain in concrete structure；
Step 3: according to monitoring range and detection requirement, it is determined that the size of stress strain gauge and the version of built-in electrode；
Step 4: stress strain gauge is embedded in concrete structure, it is ensured that stress strain gauge stress is good；
Step 5: gather the resistance value between stress strain gauge built-in electrode, by the rate of change of stress strain gauge resistance, the stress and strain within concrete structure is monitored.
Concretely comprising the following steps of described step 3:
Overall dimensions according to the scope identified sign strain transducer needing monitoring in concrete structure, selected overall dimensions to ensure not affect the globality of concrete structure itself；
Detection requirement according to concrete structure and the overall dimensions of stress strain gauge, it is determined that the laying spacing between the laying number of plies and the built-in electrode of built-in electrode；
Concretely comprising the following steps of described step 4:
Concrete structure is unloaded and supporting, it is ensured that under the state that concrete structure is in zero external load；
Monitoring location at concrete structure is slotted according to overall dimensions and the Impact direction of stress strain gauge, leaves gap between stress strain gauge and the cell wall of fluting；The position of fluting to ensure accurately, can good stress with proof stress strain transducer；Being sized to of fluting ensures that sensor can be imbedded, and leaves space, in order to sensor is bonding with concrete structure；
Preparation epoxide-resin glue, and epoxide-resin glue is applied in the inner surface of fluting；Institute's glue-spread to ensure not interspace between sensor and the combination of concrete structure；
By stress strain gauge according to Impact direction, external wire place faces outwardly, and embeds in fluting, makes not interspace between stress strain gauge and fluting；Ensure that sensor is accurately imbedded by precalculated position, and make sensor fully be wrapped up by epoxide-resin glue.
After epoxide-resin glue solidifies completely and reaches requirement of strength, remove the supporting of concrete structure.
Operation principle of the present utility model is:
Epoxy resin itself is a kind of thermoplastic oligomer, poor-performing, but carries out can presenting after curing reaction forms three-dimensional crosslinked network the performance of a series of excellence with firming agent.There is after epoxy resin cure excellent mechanical property, dimensional stability, chemical stability and durability, the corrosion function of various acid, alkali, solvent and mycete can be resisted, and this epoxy resin cured product can pass through to mix plasticizer, toughener etc. is modified, thus with a lot of different mechanical properties construction material all there is the good compatibility.Epoxy resin cured product and concrete material have the good compatibility.
The conductive material such as CNT, nano-graphene is mixed and is scattered in epoxy resin (bisphenol A type epoxy resin can be adopted), and adopt firming agent (polynary amine curing agent can be adopted) carry out solidify obtained composite there is good electric conductivity and agility, it can be used as sensor, and implant inside concrete structure can the change of ess-strain within induction structure thing well, can as a kind of sensor of concrete structure health monitoring.This sensor had both had the sensing capability of conventional sensors, the good compatibility is had again with concrete structure, and there is good mechanical property, good endurance, stable performance, cost is low, thus can as well stress strain gauge a kind of in concrete structure, the situation of long term monitoring inside concrete ess-strain.
The beneficial effects of the utility model are:
1, this utility model sensor and concrete structure have the good compatibility, it is possible to concrete structure cooperation.
2, this utility model sensor performance is stable, long service life, implants survival rate high, can be used for long term monitoring concrete structure internal stress strain conditions.
3, this utility model sensor production flexible and convenient, can adjust profile and the internal structure of sensor flexibly according to detection requirement, and the suitability is stronger.
4, this utility model sensor is buried underground simply, it is easy to use.
5, this utility model sensor is less costly, is of value to and promoting the use of.
Accompanying drawing explanation
Fig. 1 is the representative configuration schematic diagram of this utility model concrete structure stress strain gauge；
Fig. 2 is the external and internal compositions schematic diagram of this utility model concrete structure stress strain gauge；
Fig. 3 is that this utility model concrete structure stress strain gauge the procedures of establishment in concrete structure prepares schematic diagram；
Fig. 4 is the schematic diagram after this utility model concrete structure stress strain gauge has been laid in concrete structure.
In figure, 1: epoxy resin smart material matrix；2: built-in electrode；3: external wire；4: outer enclosure layer；5: concrete structure, 6: fluting, 7: stress strain gauge.
Detailed description of the invention
Below in conjunction with drawings and Examples, this utility model is further illustrated.
As shown in Figure 1 be concrete structure stress strain gauge representative configuration, the external and internal compositions figure of the concrete structure stress strain gauge shown in Fig. 2, concrete structure stress strain gauge, including epoxy resin smart material matrix 1, built-in electrode 2, external wire 3 and outer enclosure layer 4；It is internal that built-in electrode 2 is parallel to epoxy resin smart material matrix 1 at a certain distance, and parallel with stress strain gauge 7 stress surface；External wire 3 is welded on described built-in electrode 2 and extends to outside epoxy resin smart material matrix 1；Described outer enclosure layer 4 is uniformly wrapped in described epoxy resin smart material matrix 1 surface；Stress strain gauge 7 needs the agility of epoxy resin smart material matrix is tested before being taken into use, it is determined that it is under pulling force and pressure effect, the quantitative relationship of internal stress and stress strain gauge 7 resistance change rate.
Epoxy resin smart material matrix 1 is epoxy resin (can adopt bisphenol A type epoxy resin) and conductive nano filler (can adopt CNT) Homogeneous phase mixing, and adopts the composite that firming agent (can adopt polynary amine curing agent) obtains after solidifying.Epoxy resin can adopt mechanical agitation to coordinate ultrasonic dispersion with the mixing of conductive nano filler, may be used without high speed emulsifying shearing method to carry out, the ratio of epoxy resin and firming agent can be calculated according to the chemical equation of epoxy resin Yu firming agent, and the consumption of conductive filler to consider that the susceptiveness (such as multi-walled carbon nano-tubes adopts 0.5wt%～10wt%) of sensor cost, engine request and sensor itself is determined simultaneously.
Built-in electrode 2 can adopt the good wire netting of electric conductivity, and wire netting surface is smooth, and clean surface is without passivation, and the diameter of metal twine is less than 1mm, and the thick performance easily affecting sensor crossed by metal twine.The spacing of metal twine is generally 2mm～15mm, and spacing too conference reduces the effectiveness of electrode, and the too little meeting of spacing causes that sensor internal does not plan a successor, and affects the performance of sensor.Concrete spacing to be determined according to the diameter of the size of sensor and metal twine, size sensor can adopt more greatly large pitch, wire netting filament diameter adopts less spacing compared with I, spacing between described built-in electrode is determined according to the fine degree needed for concrete structure internal stress strain monitoring, and the branch's spacing monitoring more fine described built-in electrode is more little.
External wire 3 can adopt common metal silk wire, outer wrap insulated hull, is welded on described built-in electrode 2 by scolding tin.
Outer enclosure layer 4 is epoxy resin cured product, adopts same material type and mixed proportion with described epoxy resin smart material matrix 1, to ensure the coordinating and unifying of whole sensor.
This utility model stress strain gauge can directly carry out pre-buried when concrete structure is built, it is also possible to directly buries underground in built concrete structure.For the latter, the step of burying underground of this utility model stress strain gauge is:
1. determine in concrete structure the position needing monitor stress to strain；
2. determine the overall dimensions of sensor according to the scope of required monitoring, selected overall dimensions to protect the globality as far as possible not affecting concrete structure itself；
3. form and the arrangement pitches of electrode in sensor is determined according to the detection requirement of concrete structure and the overall dimensions of sensor；
4. pair concrete structure unloads and supporting ensures under the state that concrete structure is in zero external load；
5. slot according to sensor overall dimensions and Impact direction at concrete structure monitoring location, such as Fig. 3, the position of groove is enough accurate, to ensure that sensor can good stress, groove be sized to ensure sensor can just imbed, and leaving a fixed gap, in order to sensor is bonding with concrete structure；
6. preparation epoxide-resin glue, epoxide-resin glue is mixed by epoxy resin and firming agent, and the material of the two is consistent with sensor base with proportioning；
7. epoxide-resin glue is applied in the inner surface slotted, and institute's glue-spread to ensure not interspace between sensor and the combination of concrete structure；
8. by sensor according to Impact direction, external wire place faces outwardly, and embeds in being slotted, such as Fig. 3, it is ensured that sensor is accurately imbedded by precalculated position, and makes sensor fully be wrapped up by epoxide-resin glue, such as Fig. 4；
9., after epoxy resin colloid solidifies completely and reaches requirement of strength, remove the supporting of concrete structure.Now can start the stress and strain of works is monitored；
10. the change of concrete structure internal stress strain can be characterized by the rate of change of the resistivity between two built-in electrodes of sensor, and corresponding stress and strain can be found out by resistance change rate with the corresponding relation of stress, strain, the concrete parts that the position of Sensor monitoring i.e. matrix between two electrodes connects.
Detailed description of the invention of the present utility model is described in conjunction with accompanying drawing although above-mentioned; but the not restriction to this utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art need not pay various amendments or deformation that creative work can make still within protection domain of the present utility model.
Claims (10)
1. a concrete structure stress strain gauge, it is characterized in that, including epoxy resin smart material matrix, described epoxy resin smart material intrinsic silicon lays some built-in electrodes by setting spacing, built-in electrode is paralleled with the stress surface of epoxy resin smart material matrix, and epoxy resin smart material matrix surface is uniformly enclosed with outer enclosure layer；Described built-in electrode is connected with external wire, and external wire extends to outside outer enclosure layer.
2. stress strain gauge as claimed in claim 1, is characterized in that, described built-in electrode is that tinsel vertical interlaced in length and breadth arranges the fenestral fabric formed.
3. stress strain gauge as claimed in claim 2, is characterized in that, the spacing between the portion transverse wire of described built-in electrode is equal with the spacing between vertical tinsel.
4. stress strain gauge as claimed in claim 2 or claim 3, is characterized in that, the spacing between the portion transverse wire of described built-in electrode is 2～15mm.
5. stress strain gauge as claimed in claim 2 or claim 3, is characterized in that, the spacing between the vertical tinsel of described built-in electrode is 2～15mm.
6. stress strain gauge as claimed in claim 2, is characterized in that, the diameter wiry forming described fenestral fabric is 0～1mm.
7. stress strain gauge as claimed in claim 1 or 2, is characterized in that, described external wire includes tinsel wire.
8. stress strain gauge as claimed in claim 7, is characterized in that, described tinsel wire outer wrap has insulating barrier.
9. stress strain gauge as claimed in claim 1 or 2, is characterized in that, described epoxy resin smart material matrix is made up of the mixture of epoxy resin and conductive nano filler.
10. stress strain gauge as claimed in claim 1 or 2, is characterized in that, described outer enclosure layer is made up of the epoxy resin cured product without conductive filler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620114124.7U CN205352590U (en) | 2016-02-04 | 2016-02-04 | Concrete structure thing stress and strain sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620114124.7U CN205352590U (en) | 2016-02-04 | 2016-02-04 | Concrete structure thing stress and strain sensor |
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| Publication Number | Publication Date |
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| CN205352590U true CN205352590U (en) | 2016-06-29 |
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| CN201620114124.7U Expired - Fee Related CN205352590U (en) | 2016-02-04 | 2016-02-04 | Concrete structure thing stress and strain sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109799265A (en) * | 2019-02-27 | 2019-05-24 | 武汉大学 | A method of damages of concrete structures is measured using carbon cloth |
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- 2016-02-04 CN CN201620114124.7U patent/CN205352590U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109799265A (en) * | 2019-02-27 | 2019-05-24 | 武汉大学 | A method of damages of concrete structures is measured using carbon cloth |
| CN109799265B (en) * | 2019-02-27 | 2020-09-22 | 武汉大学 | Method for measuring damaged part and degree of concrete by using carbon fiber cloth |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160629 Termination date: 20170204 |