CN102384802A - Embedded type sensor of overall process shear stress of concrete dynamic damage - Google Patents
Embedded type sensor of overall process shear stress of concrete dynamic damage Download PDFInfo
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- CN102384802A CN102384802A CN2011102260298A CN201110226029A CN102384802A CN 102384802 A CN102384802 A CN 102384802A CN 2011102260298 A CN2011102260298 A CN 2011102260298A CN 201110226029 A CN201110226029 A CN 201110226029A CN 102384802 A CN102384802 A CN 102384802A
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Abstract
The invention discloses an embedded type sensor of overall process shear stress of concrete dynamic damage, which comprises a granite protective cover, a d15 mode piezoelectric ceramic chip, an epoxy resin insulating layer, a shielding lead and a shielding joint, wherein the piezoelectric ceramic chip is welded with the shielding lead to form a whole and is wrapped by using high strength epoxy resin to form an insulating and waterproof protective layer; and the piezoelectric ceramic chip is bonded with the granite protective cover of which the external surface is roughened to form a whole by utilizing the epoxy resin, and thereby the sensor of the concrete internal dynamic shear stress is formed. The sensor has the advantages of interference exemption of a concrete internal stress field, overall process monitoring of concrete internal dynamic damage evolution, good interface compatibility, simple structure and low construction cost.
Description
Technical field
The present invention relates to a kind of sensor of flush type concrete dynamic shear stress, especially can monitor the dynamic shear stress of inside concrete power damage overall process.
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 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 shear stress sensor; The employing piezoceramic material is sensing element (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 the relation between shear 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 shear 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 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 power damage overall process shear 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 shear stress sensor structure comprises: grouan containment vessel, d15 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 shear 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 shear 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 shear 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 shear stress sensor structural representation.
Fig. 2 is a kind of flush type concrete power damage overall process shear stress sensor cross-sectional view.
Among the figure: 1---the grouan containment vessel; 2---d15 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, d15 mode piezoelectric potsherd 2, epoxy resins insulation waterproof 3, shielded conductor 4 and shielded joint 5 compositions.D15 mode piezoelectric potsherd 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 shear 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 and press plane, d15 mode piezoelectric potsherd place with consistent by geodesic structure principal shear stress direction; When structure receives the external impetus load action; According to piezoelectric effect, the piezoelectric ceramics polarised direction vertical front and rear surfaces can produce equivalent and electrical opposite electric charge, the quantity of electric charge is directly proportional with shear stress; 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 the shear stress of xoncrete structure power damage overall process is monitored.
Claims (1)
1. a flush type concrete power damage overall process shear stress sensor is characterized in that this sensor comprises grouan containment vessel (1), d15 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); D15 mode piezoelectric potsherd (2) is positioned at the inside of grouan containment vessel; Scribble epoxy resins insulation water barrier (3) above; One end of d15 mode piezoelectric potsherd (2) links to each other with shielded conductor (4), and the other end links to each other with joint (5), and shielded joint (5) is connected with data acquisition system (DAS).
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| CN2011102260298A CN102384802A (en) | 2011-08-08 | 2011-08-08 | Embedded type sensor of overall process shear stress of concrete dynamic damage |
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| CN2011102260298A CN102384802A (en) | 2011-08-08 | 2011-08-08 | Embedded type sensor of overall process shear stress of concrete dynamic damage |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104236765A (en) * | 2013-08-03 | 2014-12-24 | 绵阳市奇石缘科技有限公司 | Piezoelectric type internal stress sensor |
| CN105527013A (en) * | 2016-01-04 | 2016-04-27 | 济南大学 | Implanted piezoelectric acceleration transducer for concrete structure health monitoring/detection as well as manufacturing method and application thereof |
| CN106087696A (en) * | 2016-06-15 | 2016-11-09 | 大连理工大学 | A kind of Filled Steel Tubular Arch Bridge concrete filled steel tube grouting density monitoring method utilizing piezoceramic transducer |
| CN106124109A (en) * | 2016-07-30 | 2016-11-16 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of concrete pressure meter mounting structure and installation method thereof |
| CN106525576A (en) * | 2016-11-25 | 2017-03-22 | 中国人民解放军61489部队 | Embedded concrete shear stress sensor |
| CN106770653A (en) * | 2016-12-05 | 2017-05-31 | 大连理工大学 | It is a kind of to stack formula piezoelectric intelligent aggregate for concrete structure health monitoring |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104236765A (en) * | 2013-08-03 | 2014-12-24 | 绵阳市奇石缘科技有限公司 | Piezoelectric type internal stress sensor |
| CN105527013A (en) * | 2016-01-04 | 2016-04-27 | 济南大学 | Implanted piezoelectric acceleration transducer for concrete structure health monitoring/detection as well as manufacturing method and application thereof |
| CN105527013B (en) * | 2016-01-04 | 2018-08-21 | 济南大学 | A kind of implanted piezoelectric acceleration sensor and its preparation method and application for concrete structure health monitoring/detection |
| CN106087696A (en) * | 2016-06-15 | 2016-11-09 | 大连理工大学 | A kind of Filled Steel Tubular Arch Bridge concrete filled steel tube grouting density monitoring method utilizing piezoceramic transducer |
| CN106087696B (en) * | 2016-06-15 | 2018-02-16 | 大连理工大学 | A kind of Filled Steel Tubular Arch Bridge concrete filled steel tube grouting density monitoring method using piezoceramic transducer |
| CN106124109A (en) * | 2016-07-30 | 2016-11-16 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of concrete pressure meter mounting structure and installation method thereof |
| CN106124109B (en) * | 2016-07-30 | 2018-11-02 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of concrete pressure meter mounting structure and its installation method |
| CN106525576A (en) * | 2016-11-25 | 2017-03-22 | 中国人民解放军61489部队 | Embedded concrete shear stress sensor |
| CN106525576B (en) * | 2016-11-25 | 2023-08-25 | 中国人民解放军61489部队 | Embedded concrete shear stress sensor |
| CN106770653A (en) * | 2016-12-05 | 2017-05-31 | 大连理工大学 | It is a kind of to stack formula piezoelectric intelligent aggregate for concrete structure health monitoring |
| CN106770653B (en) * | 2016-12-05 | 2024-02-20 | 大连理工大学 | Stacked piezoelectric intelligent aggregate for concrete structure health monitoring |
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Application publication date: 20120321 |