CN107830952A - A kind of strain ga(u)ge for concrete stress test and preparation method thereof - Google Patents
A kind of strain ga(u)ge for concrete stress test and preparation method thereof Download PDFInfo
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- CN107830952A CN107830952A CN201711125274.3A CN201711125274A CN107830952A CN 107830952 A CN107830952 A CN 107830952A CN 201711125274 A CN201711125274 A CN 201711125274A CN 107830952 A CN107830952 A CN 107830952A
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- strain gauge
- strain
- elastic patch
- pad
- patch
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2287—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges constructional details of the strain gauges
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- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The invention discloses a kind of strain ga(u)ge for concrete stress test and preparation method thereof, including strain gauge body and it is arranged on the elastomer of strain gauge outer body, wherein strain gauge body includes strain gauge substrate, strain gauge sensitive grid is provided with strain gauge substrate, strain gauge sensitive grid is connected with strain gauge pad by strain gauge side grid, is welded on strain gauge pad leaded；Its elastomer includes two elastic patch, and the one side of elastic patch is arranged to annular knurl face, and another side is arranged to sticking veneer, and strain gauge body is arranged between the sticking veneer of two elastic patch.Solve the problems, such as that existing embedded strain gauge measurement is inaccurate, there is provided a kind of strain gauge that can for a long time, reliably, effectively carry out concrete stress measurement.
Description
Technical field
The invention belongs to resistance strain gauge technology field；More particularly to a kind of resistance-strain for concrete stress test
Meter and preparation method thereof.
Background technology
Strain ga(u)ge is the sensing element for utilizing " resistance-strain " effect to be made, and it is Stress analysis from test result, surveyed
Measurement technology, automatic detection and the critical component of control technology and sensor are measured, is widely used in numerous areas, is had
There is important application value.
With the development of strain measurement technology and strain gauge transducer manufacturing technology, the structure type of strain ga(u)ge has been sent out
Transform into varied.Usually, it is divided into single shaft strain ga(u)ge, multiaxis strain ga(u)ge and combined type strain ga(u)ge.
Strain gauge purposes is very extensive, and it is one of its important application aspect to measure concrete stress.Concrete due to
The advantages that its raw material sources is wide, and preparation technology is simple, has preferable caking property with reinforcing bar, and compression strength is high turns into civil engineering
In the construction material that is most widely used.Simultaneously as its tensile property is poor, the shortcomings of big is shunk, is carrying out cast-in-place concrete
Research and quality control in usually need to test the contraction or expansion strain of concrete, while need to test concrete component
Intensity, deformation and force-bearing situation, it is also desirable to the online health monitoring of concrete structure.
The method of test concrete stress has two kinds at present：First method is to wait until concrete formation, reaches certain strong
After degree, paste foil gauge in concrete surface and carry out stress-strain test.Because concrete surface is relatively rough, strain gauge is pasted
Unreliable afterwards, strain measurement precision is low, while the method can not test strain of the concrete in plasticity phase inside concrete.Second
Kind method is utilized in the mode of the pre-buried strain gauge of component inside, this mode, strain ga(u)ge and concrete can be made abundant
Contact, therefore the stress variation situation during concrete setting can be measured.
Embedded concrete strain ga(u)ge is mostly poured using concreting, high polymer material at present, these shells
Protection strain gauge can be functioned well as, can also transmit strain, but due to easily occurring pouring stress, material inequality in process
The problems such as even, sensor performance uniformity is poor, and reliability is bad, and measurement accuracy is low, in actual applications can not batch application, and
The vibrating string extensometer of Metal Packaging obtains high volume applications at present, but vibrating string extensometer has that measuring accuracy is poor, and drift is big,
The problems such as temperature performance difference, there is also problems in engineer applied.
The content of the invention
The invention provides a kind of strain ga(u)ge for concrete stress test and preparation method thereof, solve existing
The problem of embedded strain gauge measurement is inaccurate, there is provided one kind can for a long time, reliable, effective progress concrete stress measurement
Strain gauge.
The technical scheme is that：A kind of strain ga(u)ge for concrete stress test, including strain gauge body
And the elastomer of strain gauge outer body is arranged on, wherein strain gauge body includes strain gauge substrate, is set in strain gauge substrate
Strain gauge sensitive grid is equipped with, strain gauge sensitive grid is connected with strain gauge pad by strain gauge side grid, welded on strain gauge pad
It is leaded；Its elastomer includes two elastic patch, and the one side of elastic patch is arranged to annular knurl face, and another side is arranged to paste
Face, strain gauge body are arranged between the sticking veneer of two elastic patch；It is provided with sticking veneer for installing strain gauge pad
Pad installation region, the side of pad installation region is provided with the sticking area for pasting strain gauge body, pad installation
The opposite side in region is provided with the guiding placement region for exporting lead.
Further, the features of the present invention also resides in：
Wherein lead is three-wire system lead, and the protective of protection lead is provided with outside lead.
Wherein pad installation region is the inclined-plane tilted down.
The through hole for strain gauge installation positioning is provided with its elastomer.
Wherein the thickness of elastic patch is 3-8mm, width 10-20mm, length 100-200mm.
Two of which elastic patch is respectively the first elastic patch and the second elastic patch, wherein being used on the first elastic patch
In paste strain gauge body, the second elastic patch is Nian Jie with the first elastic patch, and on the second elastic patch with strain gauge body
Between be provided with gap.
Protective is filled between wherein the first elastic patch guiding placement region relative with the second elastic patch.
Present invention also offers the preparation method of above-mentioned strain ga(u)ge, comprise the following steps：
Step S1, using elastomer made of modified special engineering plastics, by high-temp epoxy glue by strain gauge body
It is pasted onto on the paster region of the first elastic patch, and strain gauge pad is arranged on pad installation region, and by three
The lead of line is drawn out of guiding placement region；
Step S2, the second elastic patch is pasted with the first elastic patch and is integrated, and make the second elastic patch with answering
There is gap between change meter body；
Step S3, the filling gel between the guiding placement region of two elastic patch is lead inside silica gel, silica gel solid
Protective is formed after change；
Step S4, two exposed faces of two elastic patch are subjected to annular knurl processing, are arranged to annular knurl face.
Further, the features of the present invention also resides in：
Modified special engineering plastics are modified PET material, the PEEK materials of modification or modification in wherein step S1
PPS materials.
The strain gauge sensitive grid of strain gauge body is constantan material in wherein step S1, and its length is 50-
100mm。
Compared with prior art, the beneficial effects of the invention are as follows：The surface of elastomer uses annular knurl face, can increase elasticity
Tight ness rating between body and concrete, the strain ga(u)ge is preferably combined with concrete, improve caking property and stress passes
Effect is passed, avoids bonding insecure measurement error；Strain gauge body uses single axle structure simultaneously, can be according to the need of measurement
Will, carry out single direction or multidirectional measurement；And by the way that strain ga(u)ge body is arranged on inside elastomer, prevent from mixing
Moisture and corrosive substance destroy to strain gauge body in solidifying soil.
Further, protective is used to protect lead, and three-wire system lead is applied to transmit over long distances, and precision
Height, can accurately transmit ess-strain, at the same can automatically the resistance of compensating wire, temperature-coefficient of electrical resistance to the shadow of test result
Ring.
Further, for the ease of by the installation site of the strain ga(u)ge Transducers Embedded in Concrete, by elastomer
Through hole realizes positioning, then in Transducers Embedded in Concrete.
Further, strain gauge body is pasted onto on the first elastic patch, then by the first elastic patch and second
Elastic patch is bonded as one, and has gap between its second elastic patch and strain gauge body, and between two elastic patch
Pasting closely, further prevents the moisture in concrete from being destroyed with other corrosive substances to strain gauge body.
Further, it is of the present invention by tensile testing machine demarcation and Transducers Embedded in Concrete Compression and Expansion experimental test
Strain gauge can realize that long period is reliably tested, and measurement accuracy reaches 0.5%.
Brief description of the drawings
Fig. 1 is the structural representation of strain ga(u)ge in the present invention；
Fig. 2 is the schematic cross-section of elastomer of the present invention；
Fig. 3 is the structural representation of elastomer veneer of the present invention；
Fig. 4 is the enlarged diagram at A in Fig. 2.
In figure：1 is paster region；2 be pad installation region；3 be guiding placement region；4 be strain gauge pad sticking veneer；
5 be strain gauge substrate；6 be strain gauge sensitive grid；7 be strain gauge side grid；8 be strain gauge pad；9 be elastomer；10 be annular knurl
Face；11 be sticking veneer.
Embodiment
Technical scheme is further illustrated with specific embodiment below in conjunction with the accompanying drawings.
The invention provides a kind of strain ga(u)ge for concrete stress test, including strain gauge body and parcel
In the elastomer 9 of strain gauge body exterior；As shown in figure 1, strain gauge body includes strain gauge substrate 5, strain gauge substrate 5 is preferred
Polyimides, polyether-ether-ketone or modified phenolic material are made；Strain gauge sensitive grid 6 is provided with strain gauge substrate 5, strain gauge is quick
Sense grid 6 are made up of constantan, and its length is 50-100mm, and its resistance value is using conventional 120 Ω or 350 Ω standards resistance
Value, strain gauge sensitive grid 6 are connected with strain gauge side grid 7, and strain gauge side grid 7 are connected with strain gauge pad 8, on strain gauge pad 8
Weld leaded, lead is three-wire system lead.
Elastomer 9 includes two elastic patch, as shown in Fig. 2 the one side of elastic patch is annular knurl face 10, another side is viscous
Veneer 11；As shown in figure 3, pad installation region 2 is provided with sticking veneer 11, as shown in figure 4, pad installation region 2 is inclination
Strain gauge pad sticking veneer 4, the higher one end of the strain gauge pad sticking veneer 4 is connected with horizontal paster region 1, Chip Area
Domain 1 is used to paste strain gauge body, and the relatively low one end of strain gauge pad sticking veneer 4 is connected with horizontal guiding placement region 3, led
It is used for extraction wire to placement region 3, and protective is provided with outside lead.As shown in figure 3, through hole is also provided with elastomer 9,
Through hole positions use for the strain ga(u)ge in Transducers Embedded in Concrete.
Preferably, the thickness of two elastic patch of elastomer 9 is 3-8mm, width 10-20mm, length 100-
200mm。
Preferably, elastomer 9 includes the first elastic patch and the second elastic patch, wherein being used to glue on the first elastic patch
Strain gauge body is pasted, the second elastic patch is Nian Jie with the second elastic patch, and has between the second elastic patch and strain gauge body
There is gap, while be oriented between placement region 3 for filling protective.
Present invention also offers the preparation method of above-mentioned strain ga(u)ge, comprise the following steps：
Step S1, elastomer 9 is made using modified special engineering plastics, preferably modified PET material, modification
PEEK materials or the PPS materials of modification；A floor height temperature epoxy Heraeus is coated on the paster region 1 of the first elastic patch, so
Strain gauge matrix 5 is pasted onto in paster region 1 afterwards, while strain gauge pad 8 is arranged on pad installation region 2, and
By the lead of three-wire system, from being oriented to, placement region 3 is interior to draw；As shown in Fig. 2 or 4, the inclined strain of the setting of strain gauge pad 8
Pad sticking veneer 4 is counted, and the region being oriented on the horizontal plane that placement region 3 is inclined-plane lower end.
Step S2, as shown in figure 3, coating the colloid of epoxy or phenolic structure, tool in the edge of the first elastic patch
Body in the colloid for placing region coating epoxy or phenolic structure outside strain gauge body 5；Then by the second elastic patch with
First elastic patch is bonded as one, but has gap between the second elastic patch and strain gauge body, i.e., the second elasticity patch
There is gap on piece between region corresponding with strain gauge body and strain gauge.
Step S3, as shown in figure 3, after the first elastic patch and the second elastic patch bonding, it is oriented to the phase of placement region 3
To region form one and be used to drawing the pore structure of lead, therefore be oriented to the space that placement regions 3 form to two and fill silicon
Glue, and lead is arranged on to the middle part of silica gel, form protective after silica gel solidification.
Step S4, two exposed faces of two elastic patch are subjected to annular knurl processing, form annular knurl face 10.
Preferably, as shown in figures 2 and 3, for the ease of the positioning and installation in concrete, it is provided with the end of elastomer
Through hole.
Preferably, the thickness of the first elastic patch and the second elastic patch is 3-8mm, width 10-20mm, and length is
100-200mm。
Preferably, strain gauge sensitive grid 6 is constantan in strain gauge body, and the constantan preferably through Overheating Treatment closes
Gold, the length of strain gauge sensitive grid 6 is 50-100mm, and resistance value is conventional 120 Ω or 350 Ω；Strain gauge substrate 5 is polyamides
Imines, polyether-ether-ketone or modified phenolic material are made.
Claims (10)
1. a kind of strain ga(u)ge for concrete stress test, it is characterised in that including strain gauge body and be arranged on
The elastomer (9) of strain gauge outer body, wherein strain gauge body include strain gauge substrate (5), and strain gauge substrate is set on (5)
There is strain gauge sensitive grid (6), strain gauge sensitive grid (6) is connected with strain gauge pad (8), strain gauge by strain gauge side grid (7)
Welded on pad (8) leaded；Its elastomer (9) includes two elastic patch, and the one side of elastic patch is arranged to annular knurl face
(10), another side is arranged to sticking veneer (11), and strain gauge body is arranged between the sticking veneer (11) of two elastic patch；Paste
The pad installation region (2) for installing strain gauge pad (8) is provided with face (11), the side of pad installation region (2) is set
The sticking area (1) for pasting strain gauge body is equipped with, the opposite side of pad installation region (2) is provided with for exporting lead
Guiding placement region (3).
2. the strain ga(u)ge according to claim 1 for concrete stress test, it is characterised in that the lead is
Three-wire system lead, and the protective of protection lead is provided with outside lead.
3. the strain ga(u)ge according to claim 1 for concrete stress test, it is characterised in that the pad peace
Dress region (2) is the inclined-plane tilted down.
4. the strain ga(u)ge according to claim 1 for concrete stress test, it is characterised in that the elastomer
(9) through hole for strain gauge installation positioning is provided with.
5. the strain ga(u)ge according to claim 1 for concrete stress test, it is characterised in that the elasticity patch
The thickness of piece is 3-8mm, width 10-20mm, length 100-200mm.
6. the strain ga(u)ge for being used for concrete stress test according to claim 1-5 any one, it is characterised in that
Described two elastic patch are respectively the first elastic patch and the second elastic patch, wherein being used to paste on the first elastic patch to answer
Become meter body, the second elastic patch is Nian Jie with the first elastic patch, and is set on the second elastic patch between strain gauge body
There is gap.
7. the strain ga(u)ge according to claim 6 for concrete stress test, it is characterised in that first bullet
Protective is filled between the property paster guiding placement region (3) relative with the second elastic patch.
8. a kind of preparation method of strain ga(u)ge as claimed in claim 1, it is characterised in that comprise the following steps：
Step S1, using elastomer (9) made of modified special engineering plastics, strain gauge body is glued by high-temp epoxy glue
It is attached on the paster region (1) of the first elastic patch, and strain gauge pad (8) is arranged on pad installation region (2), and
And from being oriented to, placement region (3) is interior to draw by the lead of three-wire system；
Step S2, the second elastic patch is pasted with the first elastic patch and is integrated, and make the second elastic patch and strain gauge
There is gap between body；
Step S3, the filling gel between the guiding placement region (3) of two elastic patch is lead inside silica gel, silica gel solid
Protective is formed after change；
Step S4, two exposed faces of two elastic patch are subjected to annular knurl processing, are arranged to annular knurl face (10).
9. the preparation method of strain ga(u)ge according to claim 8, it is characterised in that modified spy in the step S1
Kind engineering plastics are modified PET material, the PEEK materials of modification or the PPS materials of modification.
10. the preparation method of strain ga(u)ge according to claim 8, it is characterised in that strain gauge in the step S1
The strain gauge sensitive grid (6) of body is constantan material, and its length is 50-100mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711125274.3A CN107830952A (en) | 2017-11-14 | 2017-11-14 | A kind of strain ga(u)ge for concrete stress test and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711125274.3A CN107830952A (en) | 2017-11-14 | 2017-11-14 | A kind of strain ga(u)ge for concrete stress test and preparation method thereof |
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| Publication Number | Publication Date |
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| CN107830952A true CN107830952A (en) | 2018-03-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112525064A (en) * | 2020-11-16 | 2021-03-19 | 中航电测仪器股份有限公司 | Self-contained medium-temperature strain gauge for semi-cured adhesive layer and use method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104359393A (en) * | 2014-11-28 | 2015-02-18 | 中航电测仪器股份有限公司 | Strain gauge and methods for manufacturing and mounting strain gauge |
| CN105203237A (en) * | 2015-10-16 | 2015-12-30 | 中航电测仪器股份有限公司 | Strainmeter applicable to rolling force sensor and manufacturing method of strainmeter |
| CN106289598A (en) * | 2016-10-31 | 2017-01-04 | 中航电测仪器股份有限公司 | A kind of strain ga(u)ge for concrete stress test |
-
2017
- 2017-11-14 CN CN201711125274.3A patent/CN107830952A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104359393A (en) * | 2014-11-28 | 2015-02-18 | 中航电测仪器股份有限公司 | Strain gauge and methods for manufacturing and mounting strain gauge |
| CN105203237A (en) * | 2015-10-16 | 2015-12-30 | 中航电测仪器股份有限公司 | Strainmeter applicable to rolling force sensor and manufacturing method of strainmeter |
| CN106289598A (en) * | 2016-10-31 | 2017-01-04 | 中航电测仪器股份有限公司 | A kind of strain ga(u)ge for concrete stress test |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112525064A (en) * | 2020-11-16 | 2021-03-19 | 中航电测仪器股份有限公司 | Self-contained medium-temperature strain gauge for semi-cured adhesive layer and use method thereof |
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