CN208366508U - A kind of concrete shear stress sensor based on shearing-type piezoelectric ceramics - Google Patents
A kind of concrete shear stress sensor based on shearing-type piezoelectric ceramics Download PDFInfo
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- CN208366508U CN208366508U CN201820076356.7U CN201820076356U CN208366508U CN 208366508 U CN208366508 U CN 208366508U CN 201820076356 U CN201820076356 U CN 201820076356U CN 208366508 U CN208366508 U CN 208366508U
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Abstract
The utility model provides a kind of concrete shear stress sensor based on shearing-type piezoelectric ceramics, comprising: shearing-type piezoelectric ceramic piece, shielded wire, connector, two encapsulation force-transmitting blocks by waterproof insulation process；Described two encapsulation force-transmitting blocks are stacked, and one of encapsulation force-transmitting block is equipped with groove towards the one side of another encapsulation force-transmitting block；The shearing-type piezoelectric ceramic piece is arranged in the groove；Described two encapsulation force-transmitting blocks and shearing-type piezoelectric ceramic piece are fixed as one by adhesives；Described two encapsulation force-transmitting blocks are connect with connector by shielded wire for the shearing-type piezoelectric ceramic piece and shearing-type piezoelectric ceramic piece is adhesively fixed by epoxy resin and is integrated, and shearing-type piezoelectric ceramic piece is connect by shielded wire with connector；The connector is connect with data collection system.The utility model provides that a kind of structure is simple, and small in size, manufacture craft is simple, cheap, has the concrete shear stress sensor of excellent compatibility with concrete.
Description
Technical field
The concrete structure internal impact shear stress measurement based on shearing-type piezoelectric material that the utility model relates to a kind of
Sensor production and its scaling method.
Background technique
Currently, in the stress measurement to concrete structure, generally by pasting resistance-type strain in concrete structural surface
Piece measures the strain of concrete surface, and the stress of concrete is then converted by the elasticity modulus of concrete material.By
Can not be directly inside Transducers Embedded in Concrete in foil gauge, the stress of measurement gained concrete is often the stress of concrete surface, and
The stress state of inside concrete can not be directly obtained.Secondly, pass through strain gage testing is strain, stress can not be straight
Measurement is connect, needs the elasticity modulus of strain and material as obtained by measurement to get to convert, the value of elasticity modulus is to conversion
As a result have an impact, for the biggish concrete material of mechanical characteristic variability, the variation of elasticity modulus is to stress
Scaling results are affected.In addition, under the strong powers load action such as earthquake, after concrete material enters the plastic stage, due to
The stress-strain relation of concrete material is no longer kept linearly, and larger mistake can be brought by directly obtaining stress by strain measurement value
Difference.Finally, an independent resistance strain plate can only measure stretching strain, the shearing strain of structure can not be obtained, can not also obtain and cut
Stress.And the measurement of shear stress is most important for concrete structure, the shearing strength of concrete material is small, and concrete is cut
Cutting through bad is a kind of typical brittle break, should be avoided in the design of structure.So exploitation can directly measure it is mixed
The sensor of the solidifying internal shear stress of soil, for the impact shear stress under the strong powers load action such as earthquake, explosion and impact
Measurement, has a very important significance.
Currently, there is no the effective means for the measurement of concrete structure internal impact shear stress, this patent proposes to be based on cutting
The concrete structure internal impact shear stress measurement sensor of cut type piezoelectric material and its scaling method.
Utility model content
It is simple that technical problem underlying to be solved in the utility model is to provide a kind of structure, small in size, manufacture craft letter
It is single, it is cheap, there is excellent compatibility with concrete, the base measured directly for concrete structure internal impact shear stress
In the shear stress sensor of shearing-type piezoelectric ceramics.
In order to solve the above technical problems, the utility model provides a kind of concrete based on shearing-type piezoelectric ceramics
Shear stress sensor, comprising: shearing-type piezoelectric ceramic piece, shielded wire, connector, two encapsulation by waterproof insulation process pass
Power block；
Described two encapsulation force-transmitting blocks are stacked, and one of encapsulation force-transmitting block encapsulates force-transmitting block towards another
One side, be equipped with groove；The shearing-type piezoelectric ceramic piece is arranged in the groove；Described two encapsulation force-transmitting blocks and
Shearing-type piezoelectric ceramic piece is fixed as one by adhesives；The shearing-type piezoelectric ceramic piece passes through shielded wire and connector
Connection
Described two encapsulation force-transmitting blocks and shearing-type piezoelectric ceramic piece are adhesively fixed by epoxy resin and are integrated, shearing-type
Piezoelectric ceramic piece is connect by shielded wire with connector；The connector is connect with data collection system；
When the concrete shear stress sensor based on shearing-type piezoelectric ceramics is acted on by impact shear stress, cause to shear
The relative movement of type piezoelectric ceramic piece inside center positive and negative charge causes shearing-type piezoelectric ceramic piece surface symbol occur opposite just
Negative bound charge, and charge density is proportional to the size of suffered impact shear stress；The charge of piezoelectric ceramics exports conversion
At voltage signal, acquired by data collection system.
In a preferred embodiment: the shape of the encapsulation force-transmitting block is cube shaped or cylindrical.
In a preferred embodiment: the encapsulation force-transmitting block is used to be made with the preferable material of concrete compatibility.
In a preferred embodiment: the encapsulation force-transmitting block pours high strength cement mortar production using mold.
In a preferred embodiment: the mold includes clamp, template layer, backplane level, and the template layer is equipped with multiple vertical
The size of cube shape or cylindrical cavity plate, mold can adjust as needed, with outer dimension required for encapsulation force-transmitting block
It is adapted.Backplane level is located at template layer in the following, template layer is made of detachable single form layer, and template layer passes through with backplane level
Clamp connection.
Compared to the prior art, the technical solution of the utility model have it is following the utility model has the advantages that
A kind of concrete shear stress sensor structure based on shearing-type piezoelectric ceramics provided by the utility model is simple, cuts
Small in size, the manufacture craft simplicity of strain gauge, cheap, cost performance height.It is concrete structure in dynamic load function
Under impact shear stress detection provide effective means.
Detailed description of the invention
Fig. 1 is concrete shear stress sensor embodiment cross-sectional view in the preferred embodiment in the utility model.
Fig. 2-3 is that the mould structure that composite cement mortar encapsulates force-transmitting block production in the preferred embodiment in the utility model shows
It is intended to.
Fig. 4 is that piezoelectric effect of the shearing-type piezoelectric ceramic piece under shear stress effect shows in the preferred embodiment in the utility model
It is intended to.
Fig. 5 is the concrete thin-wall cylinder that the calibration of concrete shear stress sensor is used in the preferred embodiment in the utility model
And the scheme of installation with cantilever girder steel.
Fig. 6 is the small-sized drop hammer tester knot of concrete shear stress sensor calibration in the preferred embodiment in the utility model
Structure schematic diagram.
Fig. 7 is the calibration result of certain piezoelectric ceramics shear stress sensor in the preferred embodiment in the utility model.
Specific embodiment
The utility model is described in further detail in conjunction with accompanying drawings and embodiments.
Referring to Fig.1, a kind of concrete shear stress sensor based on shearing-type piezoelectric ceramics, including it is packaged in waterproof insulation
Shearing-type piezoelectric ceramic piece 2, connector 4, shape in glue are two encapsulation force-transmitting blocks 1 of cuboid-type, and two encapsulation force-transmitting blocks 1 use
It is stacked, the one side that one of encapsulation force-transmitting block 1 encapsulates force-transmitting block 1 towards another piece is equipped with groove, the shearing-type pressure
Electroceramics piece 2 is placed in the groove, and two encapsulation force-transmitting blocks 1 and shearing-type piezoelectric ceramic piece 2 are adhesively fixed by epoxy resin 3
It is integrated, shearing-type piezoelectric ceramic piece 2 is connect by shielded wire with connector 4, and the connector 4 is connected with data collection system.
The shape of the encapsulation force-transmitting block 1 can be cylindrical, using the composite cement mortar compatible with concrete material and by pre-
Molding jig manufacture.
Referring to Fig. 2-3, the composite cement mortar encapsulation force-transmitting block of the utility model embodiment manufactures a kind of mold used,
Including small-sized tongue 5, clamp 7, template layer 8, backplane level 9.It is 1.5cm that template layer 8, which is equipped with 40 width, is highly 0.5cm
(size can according to actual needs or design adjustment) cuboid cavity plate 6, wherein have on a half mold one it is small-sized
Tongue, tongue width are 0.7cm, are highly 0.1cm.Backplane level 9 is located at template layer 8 in the following, template layer 8 is by detachable monolithic
Template composition.Template layer 8 and backplane level 9 are fixed by clamp 7.When making encapsulation force-transmitting block 1 using composite cement mortar, first will
Mold clean is clean, in the uniform coating lubricating oil of molding surface, then the compound cement being stirred is poured into mold and is vibrated
Closely knit, demoulding after standing one day obtains cuboid-type composite cement mortar encapsulation force-transmitting block, puts it into water and conserve after solidification
With spare.
Referring to Fig. 4, the basic functional principle of embodiment is: using the direct piezoelectric effect of shearing-type piezoelectric ceramics, working as shearing
When type piezoelectric ceramic piece 2 is acted on by foreign impacts shear stress, piezoelectric ceramics inside center positive and negative charge can be caused to relatively move
And the opposite positive and negative charge of symbol is generated on piezoelectric ceramics surface, and charge density is proportional to the big of be hit shear stress
It is small.
Reference Fig. 5, a kind of scaling method of above-mentioned concrete shear stress sensor based on shearing-type piezoelectric ceramics:
Concrete shear stress sensor to be calibrated based on shearing-type piezoelectric ceramics is embedded in hollow thin-wall concrete cylinder 14
On cross section, the radius of thin-walled hollow concrete cylinder and the ratio of wall thickness should be greater than 10, to guarantee to impact shear stress point on thin-walled
Cloth is uniform.One end end face of hollow thin-wall concrete cylinder 14 is fixed on steel plate 15, steel plate 15 is fixed on hold-down support,
The other end face is connect by junction steel plate 13 with a band cantilever girder steel 10.Band 10 section of cantilever girder steel is cylinder, cylindrical shaft
Heart line is overlapped with the axial line of hollow thin-wall concrete cylinder.Band cantilever girder steel 10 is supported by two supports 12, and is passed through coaxial
Annulus 11 guarantee that band cantilever girder steel 10 only twists movement.It is impacted using small-sized drop hammer tester outstanding with cantilever girder steel 10
Arm end, and the dynamic force snesor 19 of calibration is installed on the tup of small-sized drop hammer tester.Band 10 cantilever end of cantilever girder steel
Under the effect of drop impact power, torque is generated in hollow thin-wall concrete cylinder 14, synchronous recording dynamic force snesor 19
The voltage signal of shear stress sensor 2 on signal and hollow thin-wall concrete cylinder cross section to be calibrated, calculates by dynamic force
The measured impact force torque generated in hollow thin-wall concrete cylinder 14 of sensor 19 and the shear stress of response are big
It is small, and linear fit is carried out with the voltage signal of concrete shear stress sensor 2 to be calibrated, show that concrete to be calibrated is cut
The sensitivity coefficient of strain gauge 2 is repeated 6 times to improve stated accuracy with battery of tests.
Referring to Fig. 6, the impact shear stress caliberating device that the present embodiment uses: marked with a small-sized drop hammer tester
Fixed, which includes the calibration standard piezoelectric formula force snesor 19 for being installed on tup, 20 top of tup by mass block 18,
The bracing wire being placed on pulley 16 is connect with pull ring 17, and pulley 16 is installed between two column guide rails 21 on the crossbeam on top, operation
When, by pulling pull ring 17, tup 20 is drawn high upwards, unclamps pull ring 17, it is outstanding that tup 20 impacts band after the movement of falling object
Arm girder steel 10 applies impact load to its cantilever end with cantilever girder steel 10, while acquiring calibration standard piezoelectric formula power sensing
The voltage signal of the force signal of device 19 and concrete shear stress sensor 2 to be calibrated.Calibration standard piezoelectric formula power is sensed
The force signal of device 19 obtains torque multiplied by the distance at drop impact centre of force point to hollow thin-wall concrete cylinder center, then
It is converted into the impact shear stress of concrete thin-wall cylinder section and the voltage signal of concrete shear stress sensor 2 to be calibrated
Amplitude carries out linear fit, obtains the sensitivity coefficient of concrete shear stress sensor 2 to be calibrated under Impact Load,
Such as Fig. 7.
The features such as the utility model has structure simple, small in size, and manufacture craft is easy, cheap, and cost performance is high be
A kind of directly measurement offer new tool of the impact shear stress of concrete structure.
The foregoing is merely the utility model preferred embodiment, the technical scope of therefore, it cannot be limited according to the utility model,
Therefore it is all according to equivalent changes and modifications made by the technical essence of the utility model and description, the utility model skill should all be belonged to
In the range of art scheme.
Claims (5)
1. a kind of concrete shear stress sensor based on shearing-type piezoelectric ceramics, characterized by comprising: pass through waterproof insulation
Shearing-type piezoelectric ceramic piece, shielded wire, connector, the two encapsulation force-transmitting blocks of processing；
Described two encapsulation force-transmitting blocks are stacked, and one of encapsulation force-transmitting block encapsulates the one of force-transmitting block towards another
Face is equipped with groove；The shearing-type piezoelectric ceramic piece is arranged in the groove；Described two encapsulation force-transmitting blocks and shearing
Type piezoelectric ceramic piece is fixed as one by adhesives；The shearing-type piezoelectric ceramic piece is connect by shielded wire with connector
Described two encapsulation force-transmitting blocks and shearing-type piezoelectric ceramic piece are adhesively fixed by epoxy resin and are integrated, shearing-type piezoelectricity
Potsherd is connect by shielded wire with connector；The connector is connect with data collection system；
When the concrete shear stress sensor based on shearing-type piezoelectric ceramics is acted on by impact shear stress, cause shearing-type pressure
The relative movement of electroceramics piece inside center positive and negative charge causes shearing-type piezoelectric ceramic piece surface the opposite positive and negative beam of symbol occur
Charge is tied up, and charge density is proportional to the size of suffered impact shear stress；The charge output of piezoelectric ceramics is converted into electricity
Signal is pressed, is acquired by data collection system.
2. a kind of concrete shear stress sensor based on shearing-type piezoelectric ceramics according to claim 1, feature exist
In: the shape of the encapsulation force-transmitting block is cube shaped or cylindrical.
3. a kind of concrete shear stress sensor based on shearing-type piezoelectric ceramics according to claim 1, feature exist
In: the encapsulation force-transmitting block is used to be made with the good material of concrete compatibility.
4. a kind of concrete shear stress sensor based on shearing-type piezoelectric ceramics according to claim 3, feature exist
In: the encapsulation force-transmitting block pours high strength cement mortar production using mold.
5. a kind of concrete shear stress sensor based on shearing-type piezoelectric ceramics according to claim 4, feature exist
In: the mold includes clamp, template layer, backplane level, and the template layer is equipped with multiple cube shaped or cylindrical cavity plate,
The size of mold can adjust as needed, be adapted with outer dimension required for encapsulation force-transmitting block；Backplane level is located at template layer
In the following, template layer is made of detachable single form layer, template layer and backplane level are linked by clamp.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820076356.7U CN208366508U (en) | 2018-01-17 | 2018-01-17 | A kind of concrete shear stress sensor based on shearing-type piezoelectric ceramics |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820076356.7U CN208366508U (en) | 2018-01-17 | 2018-01-17 | A kind of concrete shear stress sensor based on shearing-type piezoelectric ceramics |
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| CN208366508U true CN208366508U (en) | 2019-01-11 |
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| CN201820076356.7U Active CN208366508U (en) | 2018-01-17 | 2018-01-17 | A kind of concrete shear stress sensor based on shearing-type piezoelectric ceramics |
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