CN102322986A - Embedded concrete dynamic damage overall-process pressure sensor - Google Patents
Embedded concrete dynamic damage overall-process pressure sensor Download PDFInfo
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- CN102322986A CN102322986A CN201110226253A CN201110226253A CN102322986A CN 102322986 A CN102322986 A CN 102322986A CN 201110226253 A CN201110226253 A CN 201110226253A CN 201110226253 A CN201110226253 A CN 201110226253A CN 102322986 A CN102322986 A CN 102322986A
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Abstract
The invention discloses an embedded concrete dynamic damage overall-process pressure sensor which comprises a granite protection shell, a piezoelectric ceramic sheet, an epoxy resin insulating layer, a shielding lead and a shielding joint, wherein the piezoelectric ceramic sheet and the shielding lead are welded together; the piezoelectric ceramic sheet is covered by high-strength epoxy resin to form an insulating water-proof protection layer; and epoxy resin is used for sticking the piezoelectric ceramic sheet and the granite protection shell of which the external surface is roughened together to form a dynamic pressure stress sensor in concrete. The embedded concrete dynamic damage overall-process pressure sensor has the advantages that a stress field in the concrete is free from being distributed, a dynamic damage evolution overall process in the concrete is monitored, and the embedded concrete dynamic damage overall-process pressure sensor is good in interfacial compatibility, simple in construction and low in construction cost.
Description
Technical field
The present invention relates to a kind of sensor of flush type concrete dynamic compressive stress, especially can monitor the dynamic compressive stress sensor of inside concrete power damage overall process (minimal stress to concrete conquassation stage).
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---flush type concrete power damage overall process compressive stress sensor; The employing piezoceramic material is sensing element (a d33 pattern); Employing grouan is encapsulating material; Utilize the direct piezo electric effect principle of piezoelectric ceramics, convert charge signal into voltage signal, utilize rating test to obtain the relation between stress and the voltage 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 stress time-histories of xoncrete structure power damage overall process, for xoncrete structure earthquake damage Mechanism Study provides a kind of new method.
Summary of the invention
In order to overcome available coagulation soil compressive 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 power damage overall process compressive 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 compressive stress sensor construction comprises: grouan containment vessel, d33 mode piezoelectric potsherd (lead zirconate titanate is called for short PZT), epoxy resins insulation water barrier, shielded conductor 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, 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 power damage overall process compressive stress sensor specific practice is: piezoelectric ceramic piece and shielded conductor are welded as a whole; With high-strength epoxy resin parcel piezoelectric ceramic piece, form the protective seam of insulation, waterproof; Utilize epoxy resin that piezoelectric ceramic piece and outside grouan containment vessel are bonded as one, put into room-dry and form after 24 hours and have high-intensity dynamic compressive 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 carry out the stress monitoring of power damage overall process to xoncrete structure.
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 power damage overall process compressive stress sensor construction synoptic diagram.
Fig. 2 is a kind of flush type concrete power damage overall process compressive stress sensor cross-section figure.
Among the figure: 1---the grouan containment vessel; 2---d33 mode piezoelectric potsherd; 3---the epoxy resins insulation water barrier; 4---shielded conductor; 5---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, piezoelectric ceramic piece 2, epoxy resins insulation waterproof 3, shielded conductor 4 and shielded joint 5 compositions.Piezoelectric ceramic piece and shielded conductor are welded as a whole,, form the protective seam of insulation, waterproof with high-strength epoxy resin parcel piezoelectric ceramic piece; Utilize epoxy resin that piezoelectric ceramic piece and outside grouan containment vessel are bonded as one, formation has high-intensity dynamic compressive stress sensor.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 ceramic piece 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; The quantity of electric charge is directly proportional with external force, and this 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 power damage overall process compressive stress sensor is characterized in that this sensor comprises grouan containment vessel (1), d33 mode piezoelectric potsherd (2), epoxy resins insulation water barrier (3), shielded conductor (4) and shielded joint (5); The outside of sensor is grouan containment vessel (1); D33 mode piezoelectric potsherd (2) is positioned at the inside of (1) of grouan containment vessel; Scribble epoxy resins insulation water barrier (3) above; One end of d33 mode piezoelectric potsherd (2) links to each other with shielded conductor (4), and the other end links to each other with shielded joint (5), and shielded joint (5) is connected with data acquisition system (DAS).
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| CN201110226253A CN102322986A (en) | 2011-08-08 | 2011-08-08 | Embedded concrete dynamic damage overall-process pressure sensor |
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| CN201110226253A CN102322986A (en) | 2011-08-08 | 2011-08-08 | Embedded concrete dynamic damage overall-process pressure sensor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033207A (en) * | 2012-12-26 | 2013-04-10 | 山东科技大学 | Carbon nanometer tube cement based composite material sensor encapsulating method |
| CN103308222A (en) * | 2012-03-14 | 2013-09-18 | 山东科技大学 | Carbon nano tube (CNT) cement based composite material sensor |
| CN103335752A (en) * | 2013-06-20 | 2013-10-02 | 中山市拓维电子科技有限公司 | Remotely and dynamically surveying system and method for road pre-buried shear stress |
| CN103557989A (en) * | 2013-11-06 | 2014-02-05 | 济南大学 | Piezoelectric strain sensor, method for testing strain sensitivity of piezoelectric strain sensor and application of piezoelectric strain sensor |
| CN105572329A (en) * | 2016-02-29 | 2016-05-11 | 大连理工大学 | Concrete crack scale distance adaptive monitoring method |
| CN112394108A (en) * | 2020-11-03 | 2021-02-23 | 南京林业大学 | Piezoelectric intelligent sensor for detecting damage of wood structure |
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| US20080034884A1 (en) * | 2006-07-07 | 2008-02-14 | Gangbing Song | Piezoceramic-based smart aggregate for unified performance monitoring of concrete structures |
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| CN201476978U (en) * | 2009-07-31 | 2010-05-19 | 华中科技大学 | Piezoelectric transducer for structure health monitoring |
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Patent Citations (4)
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| US20080034884A1 (en) * | 2006-07-07 | 2008-02-14 | Gangbing Song | Piezoceramic-based smart aggregate for unified performance monitoring of concrete structures |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308222A (en) * | 2012-03-14 | 2013-09-18 | 山东科技大学 | Carbon nano tube (CNT) cement based composite material sensor |
| CN103033207A (en) * | 2012-12-26 | 2013-04-10 | 山东科技大学 | Carbon nanometer tube cement based composite material sensor encapsulating method |
| CN103335752A (en) * | 2013-06-20 | 2013-10-02 | 中山市拓维电子科技有限公司 | Remotely and dynamically surveying system and method for road pre-buried shear stress |
| CN103557989A (en) * | 2013-11-06 | 2014-02-05 | 济南大学 | Piezoelectric strain sensor, method for testing strain sensitivity of piezoelectric strain sensor and application of piezoelectric strain sensor |
| CN105572329A (en) * | 2016-02-29 | 2016-05-11 | 大连理工大学 | Concrete crack scale distance adaptive monitoring method |
| CN112394108A (en) * | 2020-11-03 | 2021-02-23 | 南京林业大学 | Piezoelectric intelligent sensor for detecting damage of wood structure |
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Application publication date: 20120118 |