CN205103252U - Detect vibration sensor of prefabricated concrete structure reinforcing bar sleeve grout plumpness - Google Patents
Detect vibration sensor of prefabricated concrete structure reinforcing bar sleeve grout plumpness Download PDFInfo
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- CN205103252U CN205103252U CN201520809177.6U CN201520809177U CN205103252U CN 205103252 U CN205103252 U CN 205103252U CN 201520809177 U CN201520809177 U CN 201520809177U CN 205103252 U CN205103252 U CN 205103252U
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- Prior art keywords
- concrete structure
- vibration
- prefabricated concrete
- bar sleeve
- plumpness
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- 239000004567 concrete Substances 0.000 title claims abstract description 24
- 239000011440 grout Substances 0.000 title abstract description 10
- 230000003014 reinforcing effect Effects 0.000 title abstract description 9
- 239000000919 ceramic Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 abstract description 17
- 230000008859 change Effects 0.000 abstract description 10
- 229920001971 elastomer Polymers 0.000 abstract 2
- 239000000806 elastomer Substances 0.000 abstract 2
- 238000012372 quality testing Methods 0.000 abstract 1
- 239000011150 reinforced concrete Substances 0.000 abstract 1
- 238000013016 damping Methods 0.000 description 19
- 238000001514 detection method Methods 0.000 description 10
- 238000010276 construction Methods 0.000 description 7
- 239000004570 mortar (masonry) Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000003993 interaction Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000005284 excitation Effects 0.000 description 3
- 239000008267 milk Substances 0.000 description 3
- 210000004080 milk Anatomy 0.000 description 3
- 235000013336 milk Nutrition 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- QHZSDTDMQZPUKC-UHFFFAOYSA-N 3,5-dichlorobiphenyl Chemical compound ClC1=CC(Cl)=CC(C=2C=CC=CC=2)=C1 QHZSDTDMQZPUKC-UHFFFAOYSA-N 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000001338 self-assembly Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The utility model relates to a reinforced concrete quality testing technical field, concretely relates to detect vibration sensor of prefabricated concrete structure reinforcing bar sleeve grout plumpness. The utility model provides a pair of detect vibration sensor of prefabricated concrete structure reinforcing bar sleeve grout plumpness, including being equipped with the airtight casing of open -ended, the bottom of casing inner chamber is equipped with the piezoceramics piece, and the piezoceramics piece is connected with one side of elastomer, and the opposite side and the PCB circuit board of elastomer are connected, the opening of casing is equipped with the embedment layer and carries on airtight waterproofly, the positive pole and the negative pole of piezoceramics piece are connected with the wire that passes the embedment layer. The utility model discloses can clear tell the sensor in the air still in the grout material, according to vibration period and change of amplitude, tell the damped vibration decay law of sensor, accurately in the work progress judge it is whether qualified that the post -grouting plumpness is filled or solidified to the grout material whether.
Description
Technical field
The utility model relates to construction quality detection technique field, is specifically related to a kind of vibration transducer detecting prefabricated concrete structure reinforced bar sleeve grouting plumpness.
Background technology
Prefabricated concrete structure, refers to the xoncrete structure be assembled by reliable connected mode by precast concrete.Because it has energy-saving and environmental protection, saves template, improve execution conditions, raise labour productivity, the advantages such as accelerating construction progress, at present China one, use in a large number in the house construction engineering of tier 2 cities.In prefabricated concrete structure, it is a kind of conventional connected mode that reinforced bar sleeve grouting connects, and whether sleeve grouting is full, directly affects shear resistance capacity and the shock resistance of structure, in " JGJ1-2014 prefabricated concrete structure technical regulation ", component connection be specify that and require standard.Since self-assembly formula house is applied at home, the detection method of the plumpness of the current grouting of research always in the industry, to reach the object controlling construction quality.But straight screw sleeve connection structure is multilayered medium to replace, as shown in Figure 1, comprise the first component 2, first reinforcing bar 3, sleeve 4, second reinforcing bar 5, second component 6, slurry outlet 7 and grouting hole 8, wherein metal and nonmetal medium alternately, body is very thin at radial thickness, is generally 5mm or 6mm, causes existing engineering lossless detection method cannot effectively detect it.
Utility model content
In order to overcome defect of the prior art, the utility model is based on the damping vibration attenuation principle of vibration, use a kind of vibration transducer detecting prefabricated concrete structure reinforced bar sleeve grouting plumpness, according to the relation that sensor surrounding medium characteristic and its vibration damping decay, judge the height of grouting material and the position relationship of sensor, reach and judge in work progress, whether grouting material is filled or solidify the whether qualified object of post-grouting plumpness.
The utility model is achieved by the following technical solution: a kind of vibration transducer detecting prefabricated concrete structure reinforced bar sleeve grouting plumpness, described vibration transducer comprises the closed shell being provided with opening, the bottom of described housing cavity is provided with piezoelectric ceramic piece, described piezoelectric ceramic piece is connected with elastomeric side, described elastomeric opposite side is connected with PCB, the opening of described housing is provided with embedding layer and carries out airtight waterproof, and the positive pole of described piezoelectric ceramic piece is connected with the wire through embedding layer with negative pole.
Further, described housing is cylinder.
Further, the diameter of described cylinder is less than 12mm, is highly less than 6mm.
Further, the diameter of described cylinder is 10mm, is highly 3mm.
Further, the diameter of described cylinder is 8mm, is highly 2.5mm.
Compared with prior art, superior effect is: a kind of vibration transducer detecting prefabricated concrete structure reinforced bar sleeve grouting plumpness that the utility model provides, the demand of the quick detection of the quality control of prefabricated concrete structure reinforced bar sleeve grouting construction process and the plumpness after being in the milk can be met, there is the advantage that test speed is fast, efficiency is high, precision is high, stable and cost is low, for the prefabricated concrete structure construction quality accident work of effective detection means provides efficient detection equipment.
Accompanying drawing explanation
Fig. 1 is that in prior art, straight screw sleeve connection structure is the cut-open view of multilayered medium alternating structure;
Fig. 2 is the theoretical model schematic diagram of damped vibration principle of the present utility model;
Fig. 3 is the vertical view of vibration transducer described in the utility model;
Fig. 4 is the cut-open view along A-A of Fig. 3;
Fig. 5 is the right view of vibration transducer described in the utility model;
Fig. 6 is the situation of change schematic diagram of vibration transducer described in the utility model vibration period and amplitude in atmosphere;
Fig. 7 is the change schematic diagram that vibration period and amplitude in grouting material are imbedded in vibration transducer described in the utility model local;
Fig. 8 is the change schematic diagram of vibration transducer described in the utility model vibration period and amplitude in grouting material;
Fig. 9 is the structural representation of the detector using state of detection prefabricated concrete structure reinforced bar sleeve described in the utility model grouting plumpness;
Figure 10 is the structural representation of the detector of detection prefabricated concrete structure reinforced bar sleeve described in the utility model grouting plumpness.
Reference numeral is as follows:
1-vibration transducer, 11-housing, 12-piezoelectric ceramic piece, 13-elastic body, 14-PCB circuit board, 15-embedding layer, 16-wire, 2-first component, 3-first reinforcing bar, 4-sleeve, 5-second reinforcing bar, 6-second component, 7-slurry outlet, 8-grouting hole, 9-detector, 91-signal accepts treating apparatus, 92-signal exciting bank, 93-MCU control module, 94-power supply, 95-man-machine interaction unit.
Embodiment
Below in conjunction with accompanying drawing, the utility model embodiment is described in further detail.
Any mechanical vibration can use equation:
represent, wherein x is amplitude, A
0for initial amplitude, t be the time, ω is the natural angular frequency of vibrational system, β is ratio of damping.The amplitude wherein vibrated exponentially is decayed, when vibrating mass is certain, after excitation the amplitude of initial vibration and frequency certain, elastic modulus its ratio of damping larger of medium around vibrating mass is larger, therefore the medium around vibrating mass is air, water, flowing mortar, solidify after mortar, its ratio of damping increases successively, accordingly, the decay of amplitude will sharply increase.Design by electric signal excitation generation vibration for this reason and can receive and encourage the vibration transducer of the damped vibration signal after cancelling and corresponding detecting instrument, between grout gap vibration transducer being embedded in reinforced bar sleeve grout outlet, then carry out the proterties of discriminating sensor surrounding medium by the attenuation of Received signal strength amplitude, reach and detect the whether full object of sleeve grouting.
As shown in Figure 2, the theoretical model of a kind of method principle of work for detecting prefabricated concrete structure reinforced bar sleeve grouting plumpness that the utility model provides, based on the amplitude fading principle of damped vibration, on direction of vibration, the acting force that object is subject to comprises elastic force and frictional resistance.
Frictional resistance: f
r=-γ v, in formula, γ is resistance coefficient, and v is speed;
According to Newton second law:
In above-mentioned formula, k is elasticity coefficient, and m is quality, and x is displacement or amplitude, and t is the time;
Namely
Order
?
Wherein, ω
0be called the natural angular frequency of vibrational system, β is called ratio of damping; This equation presses the difference of β size, and the differential equation has three kinds of multi-form solutions.When damping is less, now β < ω
0, be called underdamping state.
Non trivial solution is:
Can be write as following form further:
Wherein, A (t)=A
0e
-β tbe called the amplitude of damped vibration, analyze this formula known, the amplitude of damped vibration is exponentially decayed, and β more high attenuation is faster, so damped vibration is named convergent oscillation again.
Based on above-mentioned rule, as shown in Fig. 6,7 and 8, it is the oscillating curve of the vibration transducer 1 under different damping coefficient.As shown in Figure 6, when clearly can tell β=0.6, the situation of change of sensor vibration period and amplitude in atmosphere, as shown in Figure 8, during β=1, the situation of change of sensor vibration period and amplitude in grouting material, and can further according to the situation of change of vibration period and amplitude, as shown in Figure 7, the situation of change that vibration period and amplitude in grouting material are imbedded in sensor local is told during β=5.
As in Figure 3-5, illustrate a kind of vibration transducer 1 detecting prefabricated concrete structure reinforced bar sleeve grouting plumpness in the utility model, comprise the closed shell 11 being provided with opening, the bottom of described housing 11 inner chamber is provided with piezoelectric ceramic piece 12, described piezoelectric ceramic piece 12 is connected with the side of elastic body 13, the opposite side of described elastic body 13 is connected with PCB 14, the opening of described housing 11 is provided with embedding layer 15 and carries out airtight waterproof, and the positive pole of described piezoelectric ceramic piece 12 is connected with the wire 16 through embedding layer 15 with negative pole.In the present embodiment, described housing 11 is cylinder, and the diameter of described cylinder is less than 12mm, is highly less than 6mm.Preferably, the diameter of described cylinder is 10mm, is highly 3mm, more preferably, the diameter of described cylinder is 8mm, is highly 2.5mm.
As shown in Figures 9 and 10, a kind of detector detecting prefabricated concrete structure reinforced bar sleeve grouting plumpness that the utility model provides, described detector 9 comprises the MCU control unit 93 of carrying out Signal transmissions with man-machine interaction unit 95, described MCU control unit 93 respectively with Signal reception treating apparatus 91, signal exciting bank 92 is connected with power supply 94, described signal exciting bank 92 is connected with the wire 16 of vibration transducer 1, damped vibration ripple is produced after pumping signal received by described vibration transducer 1, damped vibration ripple is transferred to MCU control unit 93 by described vibration transducer 1, described MCU control unit 93 is single-chip microcomputer, DSP or FPGA, described man-machine interaction unit 95 comprises keyboard, touch-screen, liquid crystal display, computer, panel computer or mobile phone.
The utility model additionally provides a kind of method detecting prefabricated concrete structure reinforced bar sleeve grouting plumpness, comprises the following steps:
Step 1) according to mechanical vibration equation:
calculate that medium is air respectively, water, flowing mortar and solidify the exponential damping threshold of rear mortar vibration amplitude, according to described exponential damping value, select vibration transducer 1 and the detector 9 of connection, described vibration transducer 1 is produced vibration by electric signal excitation and is received and encourages the damped vibration signal after cancelling to increase successively with ratio of damping, and the decay of amplitude can sharply increase;
Step 2) the first component 2 being embedded with sleeve 4 is assembled with second component 6, be provided with the first reinforcing bar 3 in the first component 2, in assembling process, the second reinforcing bar 5 of the outwardly setting of described second component 6 be assemblied in the inner chamber of sleeve 4, wait for grouting;
Step 3) before grouting, by step 1) described vibration transducer 1 is embedded between the grout gap of reinforced bar sleeve 4 grout outlet, the height that described vibration transducer 1 is arranged is identical with the height of the grout outlet 7 on sleeve 4;
Step 4) be in the milk from the grouting hole 8 on the first component 2, before grouting material solidifies, connect vibration transducer 1 and Acquisition Instrument 9, and start detection instrument 9, described vibration transducer 1 is under the signal exciting bank 92 being arranged on outside sends the driving of pumping signal, produce mechanical vibration, receive the signal that pumping signal cancels rear sensor damped vibration generation simultaneously, when the surface of vibration transducer 1 is covered by different medium, ratio of damping is different, the vibration of vibration transducer 1 will decay with friction speed, surface dielectric elastic modulus is larger, vibration damping is faster, surface dielectric elastic modulus is less, vibration damping is slower, vibration transducer 1 sends signal according to the rule of vibration damping, Signal reception treating apparatus 91 receives the signal that vibration transducer 1 sends, signal transacting is carried out to signal, sampling processing, described Signal reception treating apparatus 91 is according to the change of vibration wave attenuation value, judge the relative position of grouting material and vibration transducer 1, when grouting material covers vibration transducer 1 completely, vibration damping is maximum, signal is sent to man-machine interaction unit 95 by MCU control unit 93, plumpness after grouting material grouting in sleeve 4, according to described vibration transducer 1 attenuation of detection, plumpness after grouting is judged, not full, then carry out back-grouting,
Step 5) test after mortar grouting material solidifies completely, change according to vibration wave attenuation value, compare with the exponential damping value of solidifying rear mortar vibration amplitude, attenuation value according to Received signal strength amplitude changes, judge the relative position of grouting material and vibration transducer 1, differentiate the interior grouting plumpness of mortar judgement the sleeve 4 whether surrounding medium of vibration transducer 1 is air or solidifies.Step 5) comprise after described grouting material solidifies, according to the size cases of described vibration transducer 1 vibration damping numerical value, judge the slurry plumpness after grouting, vibration damping numerical value is little, the plumpness of being in the milk after solidifying, for not full, judges that construction quality is defective.The utility model can judge the relation of grouting material height and sensor according to the damped vibration attenuation of sensor, reach and control to judge whether grouting material is filled at any time in work progress, can complete the object that grouting plumpness detects after grouting is solidified.
The utility model is not limited to above-mentioned embodiment, and when not deviating from flesh and blood of the present utility model, any distortion that it may occur to persons skilled in the art that, improvement, replacement all fall into protection domain of the present utility model.
Claims (5)
1. one kind is detected the vibration transducer of prefabricated concrete structure reinforced bar sleeve grouting plumpness, it is characterized in that, described vibration transducer (1) comprises the closed shell (11) being provided with opening, the bottom of described housing (11) inner chamber is provided with piezoelectric ceramic piece (12), described piezoelectric ceramic piece (12) is connected with the side of elastic body (13), the opposite side of described elastic body (13) is connected with PCB (14), the opening of described housing (11) is provided with embedding layer (15) and carries out airtight waterproof, the positive pole of described piezoelectric ceramic piece (12) is connected with the wire (16) through embedding layer (15) with negative pole.
2. detect the vibration transducer of prefabricated concrete structure reinforced bar sleeve grouting plumpness according to claim 1, it is characterized in that, described housing (11) is cylinder.
3. detect the vibration transducer of prefabricated concrete structure reinforced bar sleeve grouting plumpness according to claim 2, it is characterized in that, the diameter of described cylinder is less than 12mm, is highly less than 6mm.
4. detect the vibration transducer of prefabricated concrete structure reinforced bar sleeve grouting plumpness according to claim 3, it is characterized in that, the diameter of described cylinder is 10mm, is highly 3mm.
5. detect the vibration transducer of prefabricated concrete structure reinforced bar sleeve grouting plumpness according to claim 3, it is characterized in that, the diameter of described cylinder is 8mm, is highly 2.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520809177.6U CN205103252U (en) | 2015-10-19 | 2015-10-19 | Detect vibration sensor of prefabricated concrete structure reinforcing bar sleeve grout plumpness |
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| CN201520809177.6U CN205103252U (en) | 2015-10-19 | 2015-10-19 | Detect vibration sensor of prefabricated concrete structure reinforcing bar sleeve grout plumpness |
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| CN205103252U true CN205103252U (en) | 2016-03-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105223343A (en) * | 2015-10-19 | 2016-01-06 | 北京智博联科技股份有限公司 | A kind of vibration transducer detecting prefabricated concrete structure reinforced bar sleeve grouting plumpness |
| CN108956962A (en) * | 2018-07-27 | 2018-12-07 | 宁波联城住工科技有限公司 | The evaluating apparatus and method of grouting material plumpness in grout sleeve |
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2015
- 2015-10-19 CN CN201520809177.6U patent/CN205103252U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105223343A (en) * | 2015-10-19 | 2016-01-06 | 北京智博联科技股份有限公司 | A kind of vibration transducer detecting prefabricated concrete structure reinforced bar sleeve grouting plumpness |
| CN105223343B (en) * | 2015-10-19 | 2017-06-23 | 北京智博联科技股份有限公司 | A kind of vibrating sensor for detecting prefabricated concrete structure reinforced bar sleeve grouting plumpness |
| CN108956962A (en) * | 2018-07-27 | 2018-12-07 | 宁波联城住工科技有限公司 | The evaluating apparatus and method of grouting material plumpness in grout sleeve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160323 Termination date: 20201019 |