CN202166404U - Embedded concrete-structure multifunctional piezoelectric intelligent aggregate free from electromagnetic interference - Google Patents
Embedded concrete-structure multifunctional piezoelectric intelligent aggregate free from electromagnetic interference Download PDFInfo
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- CN202166404U CN202166404U CN2011202861327U CN201120286132U CN202166404U CN 202166404 U CN202166404 U CN 202166404U CN 2011202861327 U CN2011202861327 U CN 2011202861327U CN 201120286132 U CN201120286132 U CN 201120286132U CN 202166404 U CN202166404 U CN 202166404U
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Abstract
The utility model discloses an embedded concrete-structure multifunctional piezoelectric intelligent aggregate free from electromagnetic interference. The aggregate is composed of a metal shielding pedestal, a metal shielding cover, d33 model piezoelectric ceramic plates, insulation rubber rings, a conducting plate, an epoxy resin insulation layer, a shielding lead and a shielding joint. The two piezoelectric ceramic plates are disposed oppositely and the conducting plate is disposed between the two piezoelectric ceramic plates. The conducting plate and a positive electrode of the shielding lead are welded into a whole. An outer shielding line of the shielding lead and the metal shielding pedestal is welded into a whole. Side faces of the piezoelectric ceramic plates are hoped tightly with the insulation rubber rings. The metal shielding pedestal and the metal shielding cover are connected integrally in a threaded manner and an upper and a lower surface of the whole of the metal shielding pedestal and the metal shielding cover are exerted with a certain pre-pressure. After welding processing is conducted for joint positions, a metal shell is coated with the epoxy resin insulation and waterproof layer. After air drying for 24 hours, the piezoelectric intelligent aggregate is formed. Coarse sands can be added appropriately when coating the epoxy resin insulation and waterproof layer, so as to guarantee good compatibility between a sensor and concrete. The embedded concrete-structure multifunctional piezoelectric intelligent aggregate free from electromagnetic interference in the utility model has advantages of distinct shielding effect, anti-interference performance of inner stress field of the concrete, whole process monitoring of power damage evolution in the concrete, clear load carrying path, simple structure and low cost.
Description
Technical field
The utility model relates to a kind of flush type xoncrete structure multifunction piezoelectric actuator intelligent aggregate of exempting from electromagnetic interference (EMI), especially can monitor normal stress and active monitoring xoncrete structure inherent vice in the concrete power damage 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.
Piezoelectric intelligent aggregate provides new method to the damage monitoring of xoncrete structure: under the prerequisite of not destroying original structure, can carry out damage monitoring passive, the active dual mode to xoncrete structure.
The core parts of the utility model are piezoelectric ceramics (lead zirconate titanate is called for short PZT), and piezoelectric ceramics just has, inverse piezoelectric effect.When piezoelectric ceramics was applied external force, piezoelectric ceramics is inner can to cause distortion because of the external force effect, and 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, was direct piezo electric effect.Utilize direct piezo electric effect, can be made into dynamic stress sensor and signal receiver; On the contrary, if apply voltage, can cause piezoelectric ceramics to produce distortion, i.e. inverse piezoelectric effect on the piezoelectric ceramics surface.Utilize inverse piezoelectric effect, can piezoelectric ceramics be processed driver.The piezoelectric intelligent aggregate and xoncrete structure interaction just utilize, inverse piezoelectric effect processed can carry out damage monitoring to 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 piezoelectric intelligent aggregate of being mentioned in No. 200810010010.8, the Chinese patent is to do containment vessel with sand-cement slurry or pea gravel concreten, and its weak point is that shielding is not done in (1) piezoelectric ceramic piece outside, receives outside electromagnetic interference easily, influences measuring accuracy; (2) used sand-cement slurry or pea gravel concreten are in easy of crack under the high pressure stress level at xoncrete structure; Be prone to cause inner piezoelectric ceramic piece to damage; The position that is not suitable for power damage overall process monitoring (2) piezoelectric ceramic piece 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, be not easy to large-scale popularization in civil engineering work.
The utility model---a kind of flush type xoncrete structure multifunction piezoelectric actuator intelligent aggregate of exempting from electromagnetic interference (EMI); Adopting piezoelectric ceramics (d33 pattern) material is sensing element, and to its outer packaging betal can with the shielding outside electromagnetic interference and can protect piezoelectric ceramic piece to carry out the monitoring of concrete damage overall process.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.For the power damage overall process of 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; Utilize the inverse piezoelectric effect principle of piezoelectric ceramics, it is applied voltage drive, piezoelectric ceramics can produce deformation; Generation is main stress wave with extensional vibration; Utilize the direct piezo electric effect principle of piezoelectric ceramics, receive the voltage signal of the stress wave conversion that decays through damage, through comparing with the initial value of setting up; The inner damage of assessment xoncrete structure is for the xoncrete structure damage monitoring provides a kind of new method.
The utility model content
In order to overcome available coagulation soil damage monitoring sensor in problems such as effectiveness, Stress Transfer path reliability, high stress stabilities; The utility model proposes a kind of flush type xoncrete structure multifunction piezoelectric actuator intelligent aggregate of exempting from electromagnetic interference (EMI); This utility model has solved the problems referred to above effectively, and makes simply stable performance; Cheap, be easy to use in the field of civil engineering large-scale popularization.
The technical scheme of the utility model is following:
A kind of flush type xoncrete structure multifunction piezoelectric actuator intelligent aggregate structure of exempting from electromagnetic interference (EMI) comprises: metallic shield base, metallic shield lid, d33 mode piezoelectric potsherd, insulation rubber circle, conducting strip, epoxy resins insulation water barrier, shielded conductor and shielded joint; Wherein, metallic shield base and metallic shield lid is referred to as metal shielding.Piezoelectric ceramic piece is positioned at the inside of metallic shield containment vessel, with the anodal placement relatively of two piezoelectric ceramic pieces, the middle conducting strip of placing; Conducting strip and shielded conductor positive pole are linked to each other; The outer shielding line of metallic shield base and shielding line links to each other, and metallic shield lid and metab through being threaded, and are applied certain pretightning force; The shielded conductor 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 xoncrete structure multifunction piezoelectric actuator intelligent aggregate specific practice of exempting from electromagnetic interference (EMI) is: with the middle relatively conducting strip of placing of two piezoelectric ceramic piece positive poles, conducting strip and shielded conductor positive pole are welded as a whole; Peripheral shielding line and metallic shield base welding one with shielded conductor; Utilize insulation rubber circle with piezoelectric ceramic piece side banding; Metallic shield base and metallic shield are covered through the one that is threaded; And after connecting portion is done soldering, its upper and lower surfaces is applied certain precompression, on metal shell, be coated with the epoxy resins insulation water barrier at last, and in surperficial scab; Guaranteeing has good compatibility between sensor and the concrete, and air-dry back formed this piezoelectric intelligent aggregate in 24 hours.
The beneficial effect of the utility model:
1. the metal shielding of the utility model can effectively shield outside electromagnetic interference, improves measuring accuracy and can play a protective role to piezoelectric ceramic piece, can carry out the stress monitoring of power damage overall process to xoncrete structure.
2. the volume of the utility model is little, intensity is high, 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. the utility model simple structure, clear, the stable performance, with low cost of Path of Force Transfer are applicable to the widespread use in the civil engineering work.
Description of drawings
Fig. 1 is a kind of flush type xoncrete structure multifunction piezoelectric actuator intelligent aggregate structural representation of exempting from electromagnetic interference (EMI).
Fig. 2 is a kind of flush type xoncrete structure multifunction piezoelectric actuator intelligent aggregate cross-sectional view of exempting from electromagnetic interference (EMI).
Among the figure: 1---the metallic shield base; 2---the metallic shield lid; 3---d33 mode piezoelectric potsherd; 4---insulation rubber circle; 5---conducting strip; 6---the epoxy resins insulation water barrier; 7---shielded conductor; 8---shielded joint.
Embodiment
Be described in detail the practical implementation process of the utility model below in conjunction with technical scheme and accompanying drawing.
The structure of the utility model such as Fig. 1, shown in Figure 2, its structure comprises metallic shield base 1, metallic shield lid 2, d33 mode piezoelectric potsherd 3, insulation rubber circle 4, conducting strip 5, epoxy resins insulation water barrier 6, shielded conductor 7 and shielded joint 8 compositions.With the positive pole of two piezoelectric ceramic pieces to together, the middle conducting strip of placing, and be welded as a whole with the inner core of shielded conductor; External packets is enclosed with the insulation rubber, and the shielding line and the metal shell of shielded conductor welded one; The metallic shield base is utilized the one that is threaded with the metallic shield lid, apply certain pretightning force simultaneously, and with the coupling part soldering, on metal shell, be coated with at last with the epoxy resins insulation water barrier, air-dry back formed this piezoelectric intelligent aggregate in 24 hours.When piezoelectric intelligent aggregate is embedded in the xoncrete structure; The external metallization containment vessel can guarantee sensor operate as normal and can effectively shield extraneous electromagnetic interference (EMI) in structural dynamic damage overall process; When being coated with epoxy resin, the outside can suitably glue some coarse sands; Guaranteeing has good compatibility between sensor and the concrete, reduces because the signal that interfacial separation causes disturbs.
Piezoelectric intelligent aggregate 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; Two sensors are placed in parallel in the both sides that damage position possibly occur; One of them sensor is carried out voltage drive, and according to inverse piezoelectric effect, it is main stress wave that sensor can produce extensional vibration with the surrounding concrete effect; The another one sensor is received the stress wave after the damage decay appears in xoncrete structure; According to direct piezo electric effect, the upper and lower surfaces of piezoelectric ceramics can produce the opposite electric charge of equivalent, through comparing with the initial value of setting up; The inner damage of assessment xoncrete structure realizes the active damage monitoring to xoncrete structure.
Claims (1)
1. a flush type xoncrete structure multifunction piezoelectric actuator intelligent aggregate of exempting from electromagnetic interference (EMI) is characterized in that this sensor comprises metallic shield base (1), metallic shield lid (2), d33 mode piezoelectric potsherd (3), insulation rubber circle (4), conducting strip (5), epoxy resins insulation water barrier (6), shielded conductor (7) and shielded joint (8); The outside of sensor is metallic shield base (1) and metallic shield lid (2), and two d33 mode piezoelectric potsherds (3) positive pole is placed relatively, the middle conducting strip (5) of placing; Conducting strip (5) and shielded conductor (7) positive pole are linked to each other; The outer shielding line of metallic shield base (1) and shielding line links to each other, with piezoelectric ceramics outside banding, metallic shield is covered (2) and metallic shield base (1) through being threaded with insulation rubber circle (4); And apply certain pretightning force; Be coated with one deck epoxy resins insulation protective seam (6) then in its outside, shielded conductor (7) other end links to each other with shielded joint (8), and shielded joint is connected with data acquisition system (DAS).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202861327U CN202166404U (en) | 2011-08-08 | 2011-08-08 | Embedded concrete-structure multifunctional piezoelectric intelligent aggregate free from electromagnetic interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202861327U CN202166404U (en) | 2011-08-08 | 2011-08-08 | Embedded concrete-structure multifunctional piezoelectric intelligent aggregate free from electromagnetic interference |
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| Publication Number | Publication Date |
|---|---|
| CN202166404U true CN202166404U (en) | 2012-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202861327U Withdrawn - After Issue CN202166404U (en) | 2011-08-08 | 2011-08-08 | Embedded concrete-structure multifunctional piezoelectric intelligent aggregate free from electromagnetic interference |
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| CN (1) | CN202166404U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN105911100A (en) * | 2016-06-15 | 2016-08-31 | 大连理工大学 | Piezoelectric ceramic annular sensor for tubular concrete structure health monitoring |
| CN108982668A (en) * | 2018-08-02 | 2018-12-11 | 武汉科技大学 | The direction of propagation is optional, resonant-frequency adjustable piezoelectric intelligent aggregate |
-
2011
- 2011-08-08 CN CN2011202861327U patent/CN202166404U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102384803B (en) * | 2011-08-08 | 2012-12-26 | 大连理工大学 | Electromagnetic interference preventing embedded type multifunctional piezoelectric intelligent aggregate of concrete structure |
| 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 |
| CN105911100A (en) * | 2016-06-15 | 2016-08-31 | 大连理工大学 | Piezoelectric ceramic annular sensor for tubular concrete structure health monitoring |
| CN108982668A (en) * | 2018-08-02 | 2018-12-11 | 武汉科技大学 | The direction of propagation is optional, resonant-frequency adjustable piezoelectric intelligent aggregate |
| CN108982668B (en) * | 2018-08-02 | 2021-09-24 | 武汉科技大学 | Piezoelectric intelligent aggregate with selectable propagation direction and adjustable resonance frequency |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120314 Effective date of abandoning: 20130306 |
|
| RGAV | Abandon patent right to avoid regrant |