CN102322985B - Embedded type concrete rod piece power damage three-dimensional stress sensor - Google Patents
Embedded type concrete rod piece power damage three-dimensional stress sensor Download PDFInfo
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- CN102322985B CN102322985B CN2011102262518A CN201110226251A CN102322985B CN 102322985 B CN102322985 B CN 102322985B CN 2011102262518 A CN2011102262518 A CN 2011102262518A CN 201110226251 A CN201110226251 A CN 201110226251A CN 102322985 B CN102322985 B CN 102322985B
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Abstract
The invention discloses an embedded type concrete rod piece power damage three-dimensional stress sensor. The sensor comprises a granite protection cover, a d33 mode piezoelectric ceramic chip, a d15 mode piezoelectric ceramic chip, a conducting strip, an epoxy resin insulating layer, a three-core shielded conducting wire and a shielded joint, wherein the piezoelectric ceramic chips and the shielded conducting wire are welded into a whole through the conducting strip; high-intensity epoxy resin is used for wrapping the piezoelectric ceramic chips to form an insulated waterproof protective layer; and epoxy resin is used for integrally adhering the piezoelectric ceramic chips with the granite protection cover which is subjected to roughing treatment to form the concrete internal dynamic pressing, shearing and shearing three-dimensional stress sensor. The sensor has the advantages of preventing a concrete internal stress field from being interfered and monitoring concrete internal power dynamic damage evolution in the whole process, along with high interface compatibility, a simple structure and low manufacturing cost.
Description
Technical field
The present invention relates to a kind of sensor of flush type concrete rod three-dimensional stress, especially can monitor concrete rod internal motivation damage overall process (minimal stress to concrete conquassation stage) dynamic pressure, cut, cut three-dimensional stress.
Background technology
Xoncrete structure is the civil engineering structure that has a large capacity and a wide range, and during using as a servant, possibly suffer power catastrophe effects such as earthquake, typhoon, collision, causes structural damage.Therefore it is most important for structural repair reinforcing decision-making to carry out structure detection timely and accurately.At present; A lot of structure partial damage detecting methods are arranged; Like ultrasonic method, acoustic emission, infrared thermal imagery method, rebound method, isotope detection method etc., the weak point of these detection methods is: (1) can only qualitative detection, can't provide the real stress information of inside configuration; (2) detect poor in timeliness, can't draw the structural damage evolutionary process; (3) equipment is heavy, cost is high.
In order to obtain the stress information of the inside in the xoncrete structure power damage process, the most directly effective method is exactly to imbed strain gauge in the key position such as the bean column node zone of structure.Generally speaking, there is the shortcoming that dynamic response lags behind, serviceable life is short in resistance strain gauge force transducer; Pressure resistance type force transducer complex manufacturing technology, cost height; The capacitive force transducer output characteristics non-linear serious, measuring accuracy is low; The piezo-electric type dynamic compressive stress sensor technology of measuring dynamic stress is very ripe; Can be made into the less sensor of volume and imbed inside configuration; But this kind sensor outer housing is made of metal, and significantly change point position local stress field and influence measuring accuracy, and compatibility is poor between sensor and the concrete; Get into nonlinear phase easy separation inefficacy at the interface at concrete; This type sensor uses quartz material as sensitive element usually in addition, costs an arm and a leg, and is difficult for large-scale popularization in civil engineering structure.
At present, flush type concrete damage diagnosis sensing element mainly contains cement base piezoelectric pottery sensing element and cement base piezoelectric composite material dual mode.The cement base piezoelectric pottery sensing element of being mentioned in the Zhao Xiao swallow PhD dissertation of Dalian University of Technology " based on the monitoring structural health conditions and the damage of piezoelectric ceramics "; Its weak point is (1) used sand-cement slurry easy of crack under xoncrete structure high pressure stress level; Cause inner piezoelectric ceramic piece to damage; The position that is not suitable for power damage process monitoring (2) piezoelectric patches can not be guaranteed, and the Stress Transfer path is uncertain; (3) be not easy vibration compacting; The 1-3 type cement base piezoelectric composite material sensing element manufacture craft of mentioning in " performance of 1-3 type cement base piezoelectric composite material sensor " literary composition that University Of Ji'nan delivers on the compound substance journal at yellow generation peak is complicated, cost is high.
The present invention---a kind of flush type concrete rod power damage process three-dimensional stress sensor; The employing piezoceramic material is sensing element (d33 pattern and a d15 pattern); Employing grouan is encapsulating material; Utilize the piezoelectric effect principle of piezoelectric ceramics, convert charge signal into voltage signal, utilize rating test to obtain d33 pattern and the compressive stress of d15 mode piezoelectric pottery and the relation between shear stress and the voltage respectively through charge amplifier.Power damage overall process for normal concrete and High Strength Concrete Structures; This embedded-type sensor will remain intact and operate as normal; Therefore can draw the three-dimensional stress time-histories of concrete rod structural dynamic damage overall process, for xoncrete structure earthquake damage Mechanism Study provides a kind of new method.
Summary of the invention
In order to overcome the available coagulation soil stress sensor in problems such as interface compatibility, Stress Transfer path reliability, high stress stabilities; The present invention provides a kind of flush type concrete rod power damage three-dimensional stress sensor; This invention has solved the problems referred to above effectively; And make simply, stable performance is easy to use in the field of civil engineering large-scale popularization.
Technical scheme of the present invention is following:
A kind of flush type concrete power damage overall process is pressed, the shear stress sensor structure comprises: grouan containment vessel, d33 and d15 mode piezoelectric potsherd (lead zirconate titanate is called for short PZT), conducting strip, epoxy resins insulation water barrier, three-core shielding lead and shielded joint.Piezoelectric ceramic piece is positioned at the inside of grouan containment vessel, scribbles the epoxy resins insulation water barrier above, and an end of piezoelectric ceramic piece links to each other with shielded conductor through conducting strip, and the other end links to each other with shielded joint, and shielded joint is connected with data acquisition system (DAS).
Above-mentioned a kind of flush type concrete rod power damage three-dimensional stress sensor specific practice is: utilize conducting resinl to link to each other with conducting strip respectively the piezoelectric ceramic piece upper and lower surface of d15 pattern; And the positive pole and the shielded conductor inner core of piezoelectric ceramic piece be welded as a whole, the negative pole of piezoelectric ceramic piece is connected with the screen layer of shielded conductor; With high-strength epoxy resin parcel piezoelectric ceramic piece, form the protective seam of insulation, waterproof, the ground mass with the bottom is bonded as one simultaneously, and the piezoelectric ceramic piece of bonding again last layer d15 pattern after air-dry 24 hours all is bonded as one until three potsherds; Utilize epoxy resin that d33 mode piezoelectric potsherd and top grouan containment vessel are bonded as one, put into room-dry and form after 24 hours and have high-intensity dynamic three-dimensional stress sensor; Sensor surface carries out roughened, to guarantee the compatibility of sensor and concrete interface.
Beneficial effect of the present invention:
1. grouan containment vessel of the present invention can play a protective role to piezoelectric ceramic piece, can monitor simultaneously pressure, the shear stress of xoncrete structure single shaft power damage overall process.
2. volume of the present invention is little, intensity is high, and grouan containment vessel and outside concrete compatibility are good, and it is imbedded a coarse aggregate that can substitute in the xoncrete structure in the concrete, does not change place, measuring position stress distribution.
3. simple structure of the present invention, stable performance, with low cost are applicable to the widespread use in the civil engineering work.
Description of drawings
Fig. 1 is a kind of flush type concrete rod power damage three-dimensional stress sensor construction synoptic diagram.
Fig. 2 is a kind of flush type concrete rod power damage three-dimensional stress sensor cross-section figure.
Among the figure: 1---the grouan containment vessel; 2---d33 mode piezoelectric potsherd; 3---d15 mode piezoelectric potsherd; 4---conducting strip; 5 epoxy resins insulation water barriers; 6---the three-core shielding lead; 7---shielded joint.
Embodiment
Be described in detail practical implementation process of the present invention below in conjunction with technical scheme and accompanying drawing.
Structure of the present invention such as Fig. 1, shown in Figure 2, its structure comprises grouan containment vessel 1, d33 mode piezoelectric potsherd 2, d15 mode piezoelectric potsherd 3, conducting strip 4, epoxy resins insulation water barrier 5, three-core shielding lead 6 and shielded joint 7 compositions.When sensor was embedded in the xoncrete structure, outside grouan containment vessel can guarantee sensor operate as normal in structural dynamic damage overall process; The grouan containment vessel must carry out roughened in addition, and the grouan containment vessel can guarantee good compatibility with concrete interface like this, reduces because the signal that interfacial separation causes disturbs.
Sensor is embedded in the xoncrete structure; Make plane, piezoelectric ceramics place with vertical, when structure receives the external impetus load action, according to direct piezo electric effect by geodesic structure principal compressive stress direction; The piezoelectric ceramics upper and lower surfaces can produce equivalent and electrical opposite electric charge, and the quantity of electric charge is directly proportional with external force; If make plane, piezoelectric ceramics place with parallel by geodesic structure principal shear stress direction; When structure receives the external impetus load action; According to piezoelectric effect, the polarised direction of piezoelectric ceramics produce equivalent and electrical opposite electric charge after the vertical front and rear surfaces, the quantity of electric charge is directly proportional with external force; Above-mentioned electric charge is converted into voltage signal through charge amplifier; And through corresponding signal acquiring system voltage signal is deposited in the computing machine, utilize the sensor voltage of dynamic load experimental calibration and the sensitivity coefficient between the stressed section stress, thereby can realize xoncrete structure is carried out the monitoring of power damage overall process.
Claims (1)
1. a flush type concrete rod power damage three-dimensional stress sensor is characterized in that this sensor comprises grouan containment vessel (1), d33 mode piezoelectric potsherd (2), d15 mode piezoelectric potsherd (3), conducting strip (4), epoxy resins insulation water barrier (5), three-core shielding lead (6) and shielded joint (7); The outside of sensor is grouan containment vessel (1); A slice d33 mode piezoelectric potsherd (2) and two d15 mode piezoelectric potsherds (3) stack gradually places the inside that is positioned at two grouan containment vessels; Utilize conducting strip (4) to link to each other with three-core shielding lead (6) with d15 mode piezoelectric potsherd (3) with d33 mode piezoelectric potsherd (2) respectively; And on piezoelectric ceramic piece, scribble epoxy resins insulation water barrier (5); Three-core shielding lead (6) other end links to each other with shielded joint (7), and shielded joint (7) is connected with data acquisition system (DAS).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102262518A CN102322985B (en) | 2011-08-08 | 2011-08-08 | Embedded type concrete rod piece power damage three-dimensional stress sensor |
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| CN2011102262518A CN102322985B (en) | 2011-08-08 | 2011-08-08 | Embedded type concrete rod piece power damage three-dimensional stress sensor |
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| Publication Number | Publication Date |
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| CN102322985A CN102322985A (en) | 2012-01-18 |
| CN102322985B true CN102322985B (en) | 2012-11-21 |
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| CN103883076B (en) * | 2014-02-26 | 2016-02-10 | 长沙理工大学 | FRP presstressed reinforcing steel and preparation method thereof and related device is mixed based on piezoelectric ceramics |
| ITUB20151059A1 (en) * | 2015-05-28 | 2016-11-28 | Itt Italia Srl | SIGNAL TRANSDUCTION DEVICE |
| CN106153728B (en) * | 2016-08-31 | 2019-07-16 | 中冶建筑研究总院有限公司 | A kind of ultrasonic nondestructive testing device |
| CN106383060B (en) * | 2016-09-19 | 2019-03-05 | 华南理工大学 | Based on the thin concrete fatigue damage analysis method for seeing DYNAMIC COMPLEX stress monitoring |
| CN108225623A (en) * | 2018-01-17 | 2018-06-29 | 华侨大学 | Concrete shear stress sensor and scaling method based on shearing-type piezoelectric ceramics |
| CN111521303B (en) * | 2020-03-30 | 2021-04-20 | 成都理工大学 | Rock mass stress wireless real-time monitoring device and measuring method |
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| DE4129701C2 (en) * | 1991-09-06 | 1994-07-28 | Halil Ulusar Dr Akbay | Measuring method for measuring mechanical stresses and transducers for carrying out the method |
| CN100465395C (en) * | 2003-04-17 | 2009-03-04 | 同济大学 | Layered cement base piezoelectric intelligent composite material and preparation method thereof |
| CN101538144B (en) * | 2009-04-14 | 2012-07-25 | 济南大学 | 2-2 type cement base piezoelectric composite material |
| CN202166495U (en) * | 2011-08-08 | 2012-03-14 | 大连理工大学 | Embedded concrete rod member power damage three-dimensional stress sensor |
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