CN105606710B - Portable sensor fixture applied to intelligent reinforcing bar - Google Patents
Portable sensor fixture applied to intelligent reinforcing bar Download PDFInfo
- Publication number
- CN105606710B CN105606710B CN201510996291.9A CN201510996291A CN105606710B CN 105606710 B CN105606710 B CN 105606710B CN 201510996291 A CN201510996291 A CN 201510996291A CN 105606710 B CN105606710 B CN 105606710B
- Authority
- CN
- China
- Prior art keywords
- reinforcing bar
- hold assembly
- tubular structure
- portable sensor
- piezoceramic transducer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000003014 reinforcing Effects 0.000 title claims abstract description 66
- 230000004301 light adaptation Effects 0.000 claims abstract description 23
- 230000035772 mutation Effects 0.000 claims abstract description 4
- 238000004458 analytical method Methods 0.000 claims abstract description 3
- 239000004593 Epoxy Substances 0.000 claims description 8
- 229910052709 silver Inorganic materials 0.000 claims description 8
- 239000004332 silver Substances 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive Effects 0.000 claims description 4
- 230000001808 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 17
- 230000002787 reinforcement Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
- 230000003247 decreasing Effects 0.000 abstract description 2
- 230000005284 excitation Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 12
- 239000004567 concrete Substances 0.000 description 8
- 238000005498 polishing Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 210000003205 Muscles Anatomy 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 206010061245 Internal injury Diseases 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000001066 destructive Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003862 health status Effects 0.000 description 1
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Classifications
-
- 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
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/223—Supports, positioning or alignment in fixed situation
Abstract
The present invention provides a kind of portable sensor fixture applied to intelligent reinforcing bar, including a pair of of hold assembly, a pair of of hold assembly is stitched together to be formed in the tubular structure that leads to, it is cylindrical shape that part is led in tubular structure, is adapted to reinforcing bar for being bonded completely；The middle part cross sectional shape of tubular structure is regular polygon, and piezoceramic transducer is placed directly against in each edge of regular polygon；Piezoceramic transducer elastic stress wave, the fixture by being responsible for excitation signal are transferred to adaptation reinforcing bar, then the piezoceramic transducer by being responsible on reception signal fixture receives stress wave, the generation damaged by waveform mutation analysis.Size of the present invention is smaller, can be mass；Piezoceramics crystal is pasted onto inside fixture in advance, not only can avoid short circuit etc. influences, but also mitigates intelligent reinforcing bar and make burden；It is adapted to reinforcement fabrication simple process, and section is circle；The fixture can guarantee to monitor quality, and field fabrication complexity is greatly decreased.
Description
Technical field
The present invention relates to reinforced concrete structure health monitorings, carry out Real-time Feedback, tool to concrete structure internal injury
Body, it is related to a kind of portable sensor fixture applied to intelligent reinforcing bar.
Background technique
Regular health monitoring is carried out to concrete steel building, and crucial building is carried out in time after catastrophe
Structure health monitoring and assessment are an important tasks.It include commonly ultrasonic wave to damages of concrete structures detection method
Detection method, impact elasticity wave method, acoustic emission detection method, detection method of photographing, sensor apparatus detection method and optical fiber sensing network detection
Method etc., these methods need testing staff to be in the action detection.Ultrasonic Detection Method result is more accurate, but is easy to be limited by environment
System；Impact elasticity wave method can only detect propagation direction and surface into right angle, not the simple crack of branch；Acoustic emission detection method is only
Occurent crack can be detected, but can detecte out the size, type and position in crack；Photography detection method can only detect table
The crack in face；The situation of missing inspection can occur because of the randomness of crack appearance for sensor apparatus detection method；Optical fiber sensing network inspection
Survey method can be restricted because the mechanical property of optical fiber is weaker.Simultaneously because such structural volume is huge, key carrying position
Covering or be difficult to approach by decorative wall etc., for example beam, column and its node or the pile of bottom etc. of structure, this makes
It obtains above-mentioned detection method to be difficult to carry out, in the state that especially works has been had damage after the calamities such as earthquake, flood or tsunami.
Method based on guiding stress wave (Guided Stress Wave) is by relaying ultrasonic stress wave on carrier
To detect the defects of surrounding structure." intelligent reinforcing bar based on piezoceramics crystal and preparation method thereof " that Wu Fan is proposed
(application No. is 201310330514.9 Chinese patents) can transport by narrow frequency guiding stress-wave loading in PZT type intelligence reinforcing bar
Amplitude change when scattering mutation and wave with waveform, predicts the local damage of concrete structure, such as crack and de- muscle, but also can
To predict the size and Orientation etc. in crack；The a part of the system as material, can be installed in inside concrete structure；Make
For active control system, information can be excited and acquired when needed.But this intelligent reinforcing bar is needed in production in bar list
Face carries out complex cuts, and section is positive eight side types, such manufacturing process construct at the scene in can not largely realize, and quality hardly possible
To guarantee；Simultaneously in terms of pasting piezoceramics crystal, needs to cooperate conduction containing silver epoxy and superior production, otherwise can
Generating short circuit etc. influences, and cannot achieve non-destructive monitoring；If reinforcing bar is longer, it will increase cutting and paste the difficulty of sensor, and
And the reinforcing bar of such situation can not be prefabricated.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of portable sensors applied to intelligent reinforcing bar
Fixture and preparation method thereof, the fixture is identical as bar material, and when site operation can knock in adaptation reinforcing bar；Wherein grip size
It is smaller, it can be mass；Piezoceramics crystal can be pasted onto inside fixture in advance simultaneously, both can avoid short circuit etc. influences,
Mitigate intelligent reinforcing bar again and makes burden；It is adapted to reinforcement fabrication simple process, and section is circle；The fixture can guarantee to monitor
Quality, and field fabrication complexity is greatly decreased.
In order to achieve the above object, the present invention provides a kind of portable sensor fixture applied to intelligent reinforcing bar, including a pair
Hold assembly, a pair of of hold assembly is stitched together to be formed in lead to tubular structure, in which: in tubular structure lead to part for circle
Post shapes are adapted to reinforcing bar for being bonded completely, increase the operability of site operation；The middle part cross sectional shape of tubular structure is positive
Polygon, piezoceramic transducer number is identical as the number of edges of regular polygon, and piezoceramic transducer is placed directly against regular polygon
Each edge on and be located at internal in the middle part of tubular structure.
Preferably, the portable sensor fixture not only can elastic stress wave signal, but also can receive stress wave signal, piezoelectricity pottery
Porcelain sensor elastic stress wave is transferred to adaptation reinforcing bar by hold assembly, then is sensed by the piezoelectric ceramics on reception signal fixture
Device receives stress wave, the generation damaged by waveform mutation analysis.
Preferably, after pasting piezoceramic transducer in each edge of the regular polygon, multiple piezoceramic transducers
The lateral perimeter surrounded is less than the lateral perimeter of the tubular structure, is used to protect piezoelectric ceramics in actual work in adaptation reinforcing bar
Sensor is from damage.
Preferably, the piezoceramics crystal sensor is pasted onto every of the regular polygon using containing silver epoxy
Bian Shang.
Preferably, the upper and lower ends of the tubular structure have chamfering, keep clamp-shaped more mellow and fuller, to increase transmission letter
Number；It is related that chamfering degree with signal receives intensity.The angle, which can according to need, to be designed, for example chamfering is 45 °.
Preferably, the middle part cross sectional shape of the tubular structure is octagon, cooperates eight piezoceramic transducers；Eight
Piece piezoceramic transducer is placed directly against in octagon each edge, and is located at internal in the middle part of tubular structure.
Preferably, the hold assembly knocks in adaptation reinforcing bar, while being applied to hold assembly using metal-to-metal adhesive and fitting
Contact portion with reinforcing bar, with the degree of coupling for increasing hold assembly with being adapted between reinforcing bar, while alleviate adaptation reinforcing work when
Tension vulnerable area.
Preferably, the hold assembly uses in pairs, the cylindrical body tubular structure led in being formed is stitched and fastened, to match
Adaptation reinforcing bar after closing polishing.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1) grip size of the present invention is smaller, related with the piezoceramic transducer size of cooperation, can be mass, gathers around
There is higher operability；
2) fixture of the present invention can guarantee reinforcing bar integrality, ensure that signal transmission quality；
3) fixture of the present invention can be easily installed on adaptation reinforcing bar, mitigate field fabrication burden；
4) clamp adaptor reinforcing bar of the present invention makes simple process, guarantees intelligent reinforcement fabrication quality very well.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the structural schematic diagram of hold assembly in one embodiment of the invention；
Fig. 2 is the structural schematic diagram of a pair of of hold assembly split in one embodiment of the invention；
Fig. 3 is fixture in one embodiment of the invention and the structural schematic diagram for being adapted to reinforcing bar assembling；
Fig. 4 is one embodiment of the invention experimental result picture；
In figure: hold assembly 1,2, piezoceramic transducer 3 contain silver epoxy 4, are adapted to reinforcing bar 5.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
As shown in Figs. 1-2, a kind of portable sensor fixture applied to intelligent reinforcing bar, including hold assembly 1, hold assembly
2, piezoceramics crystal sensor 3, contain silver epoxy 4, in which: hold assembly 1, hold assembly 2, which be stitched together, to be formed
Logical tubular structure, it is cylindrical shape that part is led in tubular structure, is adapted to reinforcing bar 5 for being bonded completely；In tubular structure
Portion section is octagon, cooperates eight piezoceramic transducers 3；Piezoceramic transducer 3 is pasted using containing silver epoxy 4
In the inside of hold assembly 1, hold assembly 2.Certainly, in other embodiments, the middle part section of tubular structure is also possible to it
His regular polygon, 3 numbers of piezoceramic transducer of cooperation are identical as regular polygon number of edges, and number of probes will affect reception letter
Number intensity, piezoceramic transducer 3 are placed directly against in regular polygon each edge, and are located at internal in the middle part of tubular structure.
The hold assembly 1 is knocked in hold assembly 2 to be adapted in reinforcing bar 5, hold assembly 1, hold assembly 2 and is adapted to steel
The contact surface of muscle 5 with the degree of coupling for increasing fixture with being adapted between reinforcing bar, while alleviating adaptation using metal adhesives such as AB glues
Tension vulnerable area when reinforcing work, while reducing field fabrication process.
The hold assembly 1, hold assembly 2 are identical as adaptation 5 material of reinforcing bar, the length is 19mm, internal diameter 16mm, cut
Face outer diameter 22mm, flange outside diameter 19mm.
The hold assembly 1, hold assembly 2 in pairs use, hold assembly 1,2 stitches and fastens to be formed in lead to cylindrical body
There is chamfering at the edge of tubular structure, the good tubular structure both ends of split, keeps clamp-shaped more mellow and fuller, to increase transmission letter
Number.
After pasting piezoceramic transducer in each edge of the octagon, eight piezoceramic transducers are surrounded outer
Side perimeter is less than the lateral perimeter of the tubular structure, in adaptation reinforcing bar is used to that piezoceramic transducer be protected to exempt from actual work
It is damaged.
It is 7.5mm octagon, hold assembly that the hold assembly 1 that stitches and fastens, 2 middle part section of hold assembly, which are side length,
1,2 intermediate groove axial length of hold assembly is 7mm, i.e., the every one side of central slot is the rectangle of 7.5mm*7mm, cooperates 6.6mm*
The piezoceramic transducer 3 of 6.6mm uses.Piezoceramic transducer 3 is pasted onto hold assembly 1, clamping with containing silver epoxy 4
2 inside grooves of component guarantee that the cathode of piezoceramic transducer 3 and the hold assembly 1 of metal material, hold assembly 2 are connected；Eight
Together with conductor combination conducting, the present embodiment uses conductive copper adhesive tape to the anode of piece piezoceramic transducer 3, in other implementations
In example, connection method is without being limited thereto.Piezoceramic transducer 3 in hold assembly 1,2 groove of hold assembly and hold assembly 1,
The non-conductive binder filling such as the gap AB glue of hold assembly 2, utmostly utilizes its deformation energy.
What is be used together with present clip is adapted to reinforcing bar, for the Ribbed Bar that surface was polished, polish length and fixture
Length is identical, and polishing part internal diameter is identical as fixture internal diameter, to guarantee the integrality of whole adaptation reinforcing bar, while the fixture
Possess the effect of reinforcing bar Le.In one embodiment, the adaptation reinforcing bar 5 is polished to by regular reinforcement, and polishing length is 19mm,
Partial cross section of polishing is circle, and a diameter of 16mm is identical as hold assembly 1,2 internal diameter of hold assembly, realizes tight fit, can protect
The integrality of whole adaptation reinforcing bar is demonstrate,proved, while fixture possesses the effect of reinforcing bar Le；Paste the clamping part of piezoceramic transducer 3
Part 1, hold assembly 2 knock in adaptation reinforcing bar 5, hold assembly 1, hold assembly 2 and the contact surface AB for being adapted to reinforcing bar 5 by rubber hammer
The binders such as glue increase its coupling, and concrete form is as shown in Figure 3.
It is adapted on reinforcing bar 5 in same root and the clamp of sensor at two is installed, two clamp of sensor interval 40mm, one group
Piezoceramic transducer 3 on clamp of sensor is responsible for pumping signal, another group of reception signal；Excitation center frequency is 75KHz
The instantaneous narrow frequency electric signal of five wave crests, amplitude is ± 10V.
Output signal, which first filters, receives signal by oscillograph again, and experimental result is as shown in figure 4, receiving-end voltage signal Mintrop wave
For ± 5V or so, and waveform is complete.This effectiveness is enough to detect concrete damage.This adaptation reinforcing bar 5 is embedded to coagulation
In soil, adaptation reinforcing bar 5 concrete health status nearby may determine that according to waveform variation.
The present invention is not limited to above-mentioned implementation example, such as the change of hold assembly 1,2 geomery of hold assembly, adhesive
Selection can all influence the efficiency of transmission of final signal.
Hold assembly 1, hold assembly 2 or the whole portable sensor fixture can be prefabricated, can greatly reduce scene and apply
Work trouble increases the convenience of intelligent reinforcement fabrication；The adaptation reinforcement fabrication is easy, and present construction personnel can be easily mastered,
And it can guarantee its production quality；The portable sensor fixture effectiveness is higher, transmits and imitates with traditional intelligence reinforcing bar
Rate is almost the same, but its field fabrication process is simple, and quality is to guarantee.
Grip size of the present invention is smaller, and specific size is related with the piezoceramic transducer of cooperation, and fixture can mention
It is preceding prefabricated, batch production；Piezoceramics crystal sensor can use to be pasted onto inside hold assembly containing silver epoxy, can be with
It is more preferable to guarantee intelligent reinforcement fabrication quality；During on-site construction, intelligent reinforcing bar Portable clamp can knock in adaptation reinforcing bar, reduce existing
Field production process.Intelligent reinforcing bar field fabrication link can be greatly reduced in the present invention, while can guarantee intelligence well again
Steel bar quality carries out damage monitoring to reinforced concrete structure.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (8)
1. a kind of portable sensor fixture applied to intelligent reinforcing bar, which is characterized in that including a pair of of hold assembly, a pair of clamping
Component is stitched together to be formed in lead to tubular structure, in which: in tubular structure lead to part be cylindrical shape, for completely paste
Properly match reinforcing bar；The middle part cross sectional shape of tubular structure is regular polygon, the side of piezoceramic transducer number and regular polygon
Number is identical, and piezoceramic transducer is placed directly against in each edge of regular polygon, and piezoceramic transducer is located at tubular structure
Inside middle part.
2. a kind of portable sensor fixture applied to intelligent reinforcing bar according to claim 1, which is characterized in that it is described just
After pasting piezoceramic transducer in each edge of polygon, the lateral perimeter that multiple piezoceramic transducers surround is less than described
The lateral perimeter of tubular structure is used to protect piezoceramic transducer from damage in actual work in adaptation reinforcing bar.
3. a kind of portable sensor fixture applied to intelligent reinforcing bar according to claim 2, which is characterized in that the pressure
Electroceramics crystal probe is utilized and is pasted onto each edge of the regular polygon containing silver epoxy.
4. a kind of portable sensor fixture applied to intelligent reinforcing bar according to claim 1, which is characterized in that the cylinder
The upper and lower ends of shape structure have chamfering, keep clamp-shaped more mellow and fuller, to increase transmission signal；Chamfering degree and signal receive
Intensity is related.
5. a kind of portable sensor fixture applied to intelligent reinforcing bar according to claim 4, which is characterized in that it is described fall
Angle is 45 °.
6. a kind of portable sensor fixture applied to intelligent reinforcing bar according to claim 1-5, feature exist
In the middle part cross sectional shape of the tubular structure is octagon, cooperates eight piezoceramic transducers；Eight piezoelectric ceramics pass
Sensor is placed directly against in octagon each edge, and is located at internal in the middle part of tubular structure.
7. a kind of portable sensor fixture applied to intelligent reinforcing bar according to claim 1-5, feature exist
In the hold assembly knocks in adaptation reinforcing bar, while being applied to the contact of hold assembly with adaptation reinforcing bar using metal-to-metal adhesive
Tension vulnerable area when being adapted to reinforcing work with the degree of coupling for increasing hold assembly with being adapted between reinforcing bar, while being alleviated in part.
8. a kind of portable sensor fixture applied to intelligent reinforcing bar according to claim 1-5, feature exist
In, the portable sensor fixture, elastic stress wave signal and can receive stress wave signal: piezoceramic transducer swashs
Stress wave is sent out, adaptation reinforcing bar is transferred to by hold assembly, then stress is received by the piezoceramic transducer on reception signal fixture
Wave, the generation damaged by waveform mutation analysis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510996291.9A CN105606710B (en) | 2015-12-25 | 2015-12-25 | Portable sensor fixture applied to intelligent reinforcing bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510996291.9A CN105606710B (en) | 2015-12-25 | 2015-12-25 | Portable sensor fixture applied to intelligent reinforcing bar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105606710A CN105606710A (en) | 2016-05-25 |
| CN105606710B true CN105606710B (en) | 2018-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510996291.9A Expired - Fee Related CN105606710B (en) | 2015-12-25 | 2015-12-25 | Portable sensor fixture applied to intelligent reinforcing bar |
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| CN (1) | CN105606710B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106168604A (en) * | 2016-08-04 | 2016-11-30 | 上海交通大学 | The monitoring method of a kind of concrete slab interlayer straight joint and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1266182A (en) * | 2000-04-05 | 2000-09-13 | 深圳职业技术学院 | Method for testing working stress of buildings structure in situ |
| CN201223881Y (en) * | 2008-06-25 | 2009-04-22 | 程晔 | Apparatus for measuring tensioning force of fine rolling screw-thread steel |
| CN103388378A (en) * | 2013-07-31 | 2013-11-13 | 上海交通大学 | Intelligent reinforcing steel bar based on piezoelectric ceramic crystal and fabrication method thereof |
| CN204531406U (en) * | 2015-04-16 | 2015-08-05 | 重庆科技学院 | A kind of device of reserved resistance strain gage paste position |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120167487A1 (en) * | 2010-12-20 | 2012-07-05 | Fluor Technologies Corporation | Locatable and embeddable anchor point covers |
| US9048521B2 (en) * | 2011-03-24 | 2015-06-02 | Etegent Technologies, Ltd. | Broadband waveguide |
-
2015
- 2015-12-25 CN CN201510996291.9A patent/CN105606710B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1266182A (en) * | 2000-04-05 | 2000-09-13 | 深圳职业技术学院 | Method for testing working stress of buildings structure in situ |
| CN201223881Y (en) * | 2008-06-25 | 2009-04-22 | 程晔 | Apparatus for measuring tensioning force of fine rolling screw-thread steel |
| CN103388378A (en) * | 2013-07-31 | 2013-11-13 | 上海交通大学 | Intelligent reinforcing steel bar based on piezoelectric ceramic crystal and fabrication method thereof |
| CN204531406U (en) * | 2015-04-16 | 2015-08-05 | 重庆科技学院 | A kind of device of reserved resistance strain gage paste position |
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Granted publication date: 20181218 Termination date: 20211225 |