CN105866249B - A kind of embedded annular piezoelectric ceramic sensor element - Google Patents
A kind of embedded annular piezoelectric ceramic sensor element Download PDFInfo
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- CN105866249B CN105866249B CN201610326533.8A CN201610326533A CN105866249B CN 105866249 B CN105866249 B CN 105866249B CN 201610326533 A CN201610326533 A CN 201610326533A CN 105866249 B CN105866249 B CN 105866249B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0232—Glass, ceramics, concrete or stone
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/102—Number of transducers one emitter, one receiver
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Abstract
The present invention provides a kind of embedded annular piezoelectric ceramic sensor elements to belong to field of civil engineering suitable for the inspection of post-tensioned concrete structure pore Grouted density.The present invention includes two circular ring shape piezoelectric ceramic pieces, epoxy resin protective layer, shielding coating layer and the cement surrounding layer composition of welding lead.Specifically, when duct grouting height changes in post-stressed concrete structure, electric signal can change between two ring-shaped piezo ceramic pieces in sensor, it can reflect out the quality of grouting quality in duct, since the present invention is ring structure, it can be directly sleeved on deformed bar or steel strand wires, the present invention is suitable for the inspection of post-tensioned concrete structure pore Grouted density.And sensor material itself is cheap, simple structure, easy for installation, provides the simple and feasible method of one kind for the inspection of post-tensioned concrete structure pore Grouted density in engineering.
Description
Technical field
The present invention relates to a kind of embedded annular piezoelectric ceramic sensor elements, are suitable for post-stressed concrete structure hole
The inspection of road Grouted density, belongs to field of civil engineering.
Background technique
With the fast development of China's infrastructure, post-stressed concrete structure exists because of its significant economic advantages
It is used widely in large bridge.And the excellent performance of post-stressed concrete structure must be set up in deformed bar
It is bonded with structural concrete on intact condition.Therefore, post-tensioned concrete structure pore grouting quality is increasingly
It is valued by people.
Piezoelectric ceramics is answered extensively as a kind of functional form ceramic material that can be realized mechanical energy and mutually convert with electric energy
For every field.Its direct piezoelectric effect refers to, piezoelectric element under the action of mechanical stress, internal positive and negative charge center
It can relatively move, generate polarization, two end surfaces of piezoelectric unit is caused the opposite bound charge of symbol, and charge density occur
It is proportional to external force.Inverse piezoelectric effect refers to, when applying electric field to piezoelectric element, internal positive and negative charge center occurs opposite
It is displaced and is polarized, piezoelectric element is caused to be deformed.The present invention takes full advantage of the positive piezoelectricity of piezoelectric ceramics and inverse piezoelectricity is imitated
It answers.
For the concealed structure as the post-stressed concrete structure reserving hole channel, traditional detection method needs
Detecting instrument is manually used, real-time online cannot be achieved in the quality for removing detection duct grouting point-by-point from concrete structure outside
Monitoring, and detection process often has certain risk.
Summary of the invention
To solve the above-mentioned problems, the present invention provides one kind can be convenient installation, exists in real time without protecting and can provide
A kind of embedded annular piezoelectric ceramic sensor element of line monitoring post-tensioned concrete structure pore grouting quality.
Due to the limitation of piezoelectric ceramics material itself, it is very easy to be destroyed.And piezoelectric ceramics is encapsulated in durability
In good material, packed piezoceramic transducer can be directly placed into as the sandstone aggregate in concrete in this way
In concrete structure, intelligent aggregate is just formd.
A kind of embedded annular piezoelectric ceramic sensor element, is a kind of with special structure form proposed in the present invention
Intelligent aggregate, inside tool is there are two piezoelectric ceramic ring, and one is used as transmitter, and one is used as receiver, with duct grouting height
The continuous promotion of degree, receiving signal can change, and the knots modification by analyzing signal may determine that the quality of duct grouting
Quality.And a kind of embedded annular piezoelectric ceramic sensor element proposed in the present invention has ring structure, can be directly sleeved on
It is easy for installation on deformed bar.
Technical solution of the present invention:
A kind of embedded annular piezoelectric ceramic sensor element, including ring-shaped piezo ceramic piece 1, epoxy resin filling protective layer 2,
Shielding coating layer 3, cement protective layer 4, conducting wire 5 and snap-fit connector (BNC) 6；Conducting wire 5 is welded on ring-shaped piezo ceramic
The positive and negative anodes of piece 1, the inner ring and outer rings surface of two ring-shaped piezo ceramic pieces 1 be successively arranged epoxy resin filling protective layer 2,
Shielding coating layer 3 and cement protective layer 4；Two are protected annular piezoelectric ceramic piece 1 to be connected and fixed by cement protective layer 4；Card
Button fitting type connector (BNC) 6 is connect with conducting wire 5.
Beneficial effects of the present invention:
1, two circular ring shape piezoelectric ceramic pieces built in this device utilize the pass between electric signal knots modification and grouting height
System may be implemented that the detection that a sensor completes duct grouting quality is used alone.
2, the present apparatus makes full use of the characteristics of post-tensioning prestressed steel concrete pore passage structure, and sensor design is in pairs
Piezoelectric ring structure can be directly sleeved on deformed bar or steel strand wires, facilitate installation.
3, present apparatus structure is simple, and material is cheap, production with it is easy for installation, and be not necessarily to Additional Protection, be able to achieve duct fill
The real-time monitoring of quality is starched, there is very big market and application prospect.
Detailed description of the invention
Fig. 1 is whole schematic diagram in kind of the invention.
Fig. 2 is xy the schematic diagram of the section structure of the invention.
Fig. 3 is the a-a cross-sectional view of Fig. 2 of the present invention.
Fig. 4 is the b-b cross-sectional view of Fig. 2 of the present invention.
Fig. 5 is sensor mounting location schematic diagram.
In figure: 1 ring-shaped piezo ceramic piece；2 epoxy resin fill protective layer；3 shielding coating layers；4 cement protective layers；5 lead
Line；6 snap-fit connectors (BNC)；7 casings；8 deformed bars or steel strand wires；9 embedded annular piezoelectric ceramic sensors
Device.
Specific embodiment
Below in conjunction with attached drawing and technical solution, a specific embodiment of the invention is further illustrated.
The present invention provides a kind of embedded annular piezoelectric ceramic sensor elements, and post stressed concrete knot may be implemented
The detection of structure duct grouting quality, specific embodiment are as follows:
Firstly, conducting wire 5 to be welded on to the positive and negative anodes of ring-shaped piezo ceramic piece 1.In the ring-shaped piezo ceramic piece for welding conducting wire
Outer surface coats epoxy resin filling protective layer 2 first, plays insulation positive and negative anodes, prevents the effect of piezoelectric patches short circuit.To epoxy
After resin protective layer 2 air-dries completely, shielding coating layer 3 is coated, the signal-to-noise ratio for receiving electric signal can be improved to a certain extent.It will
Two piezoelectric ceramic rings handled well are put into mold, are fixed with nylon wire, mold are filled using cement slurry, to cement slurry sets
After, cement protective layer 4 is formed, it is whether short-circuit using multimeter detection sensor.Finally, by snap-fit connector
(BNC) it 6 is connect with conducting wire 5, whether short-circuit reuses multimeter detection sensor.
A kind of embedded annular piezoelectric ceramic sensor element 9 of the present invention is directly sleeved on post stressed concrete when use
In structure on deformed bar or steel strand wires 8, realized by the variation that sensor emission receives signal for matter of being in the milk in casing 7
The monitoring of amount.
There is two o'clock to need to pay attention to here: first, it is the selection about annulus piezoelectric ceramic piece, it be according in detected duct
The size of deformed bar or steel strand wires is reasonably selected with cement protective layer thickness inside annulus, guarantees the sensing that encapsulation is completed
Device can cover on deformed bar or steel strand wires.Second, it is about cement protective layer, the selection of cement model should be selected as far as possible
Cement material identical with grouting material is selected, ensure that the sensor of embedment contacts well with grouting liquid.
The present invention has the following advantages compared with prior art: sensor internal is gathered around there are two piezoelectric ceramic piece, may be implemented
The real time on-line monitoring of duct grouting quality is completed using single-sensor, material is cheap, simple process, it will is widely used in
The inspection of post-tensioned concrete structure pore grouting quality.
Claims (1)
1. a kind of embedded annular piezoelectric ceramic sensor element, which is characterized in that embedded annular piezoelectric ceramic sensor element includes ring
Shape piezoelectric ceramic piece, epoxy resin filling protective layer, shielding coating layer, cement protective layer, conducting wire and snap-fit connector；
Conducting wire is welded on the positive and negative anodes of ring-shaped piezo ceramic piece, is successively arranged on the inner ring and outer rings surface of two ring-shaped piezo ceramic pieces
Epoxy resin fills protective layer, shielding coating layer and cement protective layer；Two protected ring-shaped piezo ceramic pieces pass through cement
Protective layer is connected and fixed；Snap-fit connector is connect with conducting wire.
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| CN201610326533.8A CN105866249B (en) | 2016-05-17 | 2016-05-17 | A kind of embedded annular piezoelectric ceramic sensor element |
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| CN201610326533.8A CN105866249B (en) | 2016-05-17 | 2016-05-17 | A kind of embedded annular piezoelectric ceramic sensor element |
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| CN105866249B true CN105866249B (en) | 2019-04-23 |
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| CN106286550A (en) * | 2016-09-29 | 2017-01-04 | 大连理工大学 | A kind of intelligent nut device for monitoring bolt connection state |
| CN106402124B (en) * | 2016-09-29 | 2018-11-09 | 大连理工大学 | A kind of intelligent bolt device for monitoring bolt connection dynamic stress situation |
| CN106441074A (en) * | 2016-09-29 | 2017-02-22 | 大连理工大学 | Piezoelectric ceramic tube-based cylindrical intelligent aggregate device |
| CN106770653B (en) * | 2016-12-05 | 2024-02-20 | 大连理工大学 | Stacked piezoelectric intelligent aggregate for concrete structure health monitoring |
| CN106501364A (en) * | 2016-12-19 | 2017-03-15 | 福州大学 | A kind of piezoelectric intelligent aggregate sensor-packaging structure and its method for packing |
| CN107529614B (en) * | 2017-09-29 | 2024-03-29 | 长安大学 | Health monitoring system and method for prefabricated assembled steel bar sleeve connecting piece |
| CN108226230B (en) * | 2018-01-05 | 2020-12-01 | 宁波大学 | Method for monitoring compactness defect of grouting material of steel bar sleeve based on piezoelectric impedance effect |
| CN108387611B (en) * | 2018-01-31 | 2020-04-07 | 济南大学 | Annular sensor for monitoring corrosion of steel bars and preparation method thereof |
| CN111579355B (en) * | 2020-06-18 | 2023-04-28 | 湖北震泰建设工程质量检测有限责任公司 | Method for monitoring unbalanced load of static load test of bored concrete pile |
| CN113552220B (en) * | 2021-08-13 | 2022-09-13 | 同济大学 | Reinforced concrete structure health monitoring system |
| CN115138548B (en) * | 2022-06-30 | 2023-07-25 | 南京航空航天大学 | Embedded composite piezoelectric ultrasonic transducer suitable for concrete, molding process and embedded support structure |
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| CN205593971U (en) * | 2016-05-17 | 2016-09-21 | 大连理工大学 | Embedded cyclic annular piezoceramic transducer |
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| JP2856748B2 (en) * | 1988-12-28 | 1999-02-10 | 岡田 健 | Method of measuring vibration propagating in a substance and vibration pickup |
| CN202421135U (en) * | 2011-12-12 | 2012-09-05 | 大连理工大学 | Nano carbon black piezoceramic composite cement-based force-measuring flaw detection sensor |
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| CN102384803A (en) * | 2011-08-08 | 2012-03-21 | 大连理工大学 | Electromagnetic interference preventing embedded type multifunctional piezoelectric intelligent aggregate of concrete structure |
| CN203941136U (en) * | 2013-09-10 | 2014-11-12 | 河海大学 | A kind of Reason of Hydraulic Structural Damage monitoring Dynamic loading test platform |
| CN203705096U (en) * | 2014-01-23 | 2014-07-09 | 沈阳建筑大学 | Wireless intelligent aggregate health monitoring device used for concrete structure |
| CN104181234A (en) * | 2014-08-29 | 2014-12-03 | 河海大学常州校区 | Nondestructive testing method based on multiple signal processing technology |
| CN205593971U (en) * | 2016-05-17 | 2016-09-21 | 大连理工大学 | Embedded cyclic annular piezoceramic transducer |
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