CN105223343A - A kind of vibration transducer detecting prefabricated concrete structure reinforced bar sleeve grouting plumpness - Google Patents
A kind of vibration transducer detecting prefabricated concrete structure reinforced bar sleeve grouting plumpness Download PDFInfo
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- CN105223343A CN105223343A CN201510679073.2A CN201510679073A CN105223343A CN 105223343 A CN105223343 A CN 105223343A CN 201510679073 A CN201510679073 A CN 201510679073A CN 105223343 A CN105223343 A CN 105223343A
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Abstract
The present invention relates to reinforced concrete technical field of quality detection, be specifically related to a kind of vibration transducer detecting prefabricated concrete structure reinforced bar sleeve grouting plumpness.A kind of vibration transducer detecting prefabricated concrete structure reinforced bar sleeve grouting plumpness provided by the invention, comprise the closed shell being provided with opening, the bottom of housing cavity is provided with piezoelectric ceramic piece, piezoelectric ceramic piece is connected with elastomeric side, 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.The present invention clearly can tell sensor in atmosphere still in grouting material, according to the change of vibration period and amplitude, tell the damped vibration attenuation law of sensor, in work progress, whether qualified accurately judge post-grouting plumpness is filled or solidified to grouting material whether.
Description
Technical field
The present invention relates to construction quality detection technique field, be 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.
Summary of the invention
In order to overcome defect of the prior art, the present invention 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 present invention is achieved through the following technical solutions: 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 provided by the invention, 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 invention;
Fig. 3 is the vertical view of vibration transducer described in the present invention;
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 present invention;
Fig. 6 is the situation of change schematic diagram of vibration transducer of the present invention 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 of the present invention local;
Fig. 8 is the change schematic diagram of vibration transducer of the present invention 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 of the present invention grouting plumpness;
Figure 10 is the structural representation of the detector of detection prefabricated concrete structure reinforced bar sleeve of the present invention 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 specific embodiment of the invention 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 provided by the invention, 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 present invention, 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 provided by the invention, 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.
Present invention also offers a kind of method detecting prefabricated concrete structure reinforced bar sleeve grouting plumpness, comprise 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 present invention 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 present invention is not limited to above-mentioned embodiment, and when not deviating from flesh and blood of the present invention, any distortion that it may occur to persons skilled in the art that, improvement, replacement all fall into protection scope of the present invention.
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.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105865568A (en) * | 2016-04-12 | 2016-08-17 | 北京市建筑设计研究院有限公司 | Device for nondestructive quantitative detection of steel bar connecting grouting sleeve |
| CN107328921A (en) * | 2017-05-11 | 2017-11-07 | 中国建筑股份有限公司 | A kind of grout sleeve grouting material plumpness detection means and method |
| CN107478512A (en) * | 2017-08-01 | 2017-12-15 | 上海市建筑科学研究院 | A kind of detection means and detection method of sleeve grouting quality |
| CN107529614A (en) * | 2017-09-29 | 2018-01-02 | 长安大学 | A kind of health monitoring systems and method of prefabricated assembling type reinforced sleeve connector |
| 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 |
| CN109991398A (en) * | 2019-01-03 | 2019-07-09 | 北京中建建筑科学研究院有限公司 | Device and method for detecting grouting fullness of steel bar sleeve |
| CN110455914A (en) * | 2019-08-16 | 2019-11-15 | 哈尔滨全感科技有限公司 | Be in the milk condition detection method inside grout sleeve based on built-in piezo ceramic element |
| CN110514736A (en) * | 2019-07-23 | 2019-11-29 | 中建三局集团有限公司 | A kind of monitoring device and its application method of assembled steel reinforced sleeve grouting compactness |
| CN111744822A (en) * | 2020-07-30 | 2020-10-09 | 福建江夏学院 | Nondestructive testing system for testing assembly type concrete structural part |
| CN112014548A (en) * | 2020-08-04 | 2020-12-01 | 上海建工集团股份有限公司 | Slurry filling fullness detection device and method in mechanical sleeve grouting construction stage |
| CN112067094A (en) * | 2020-09-09 | 2020-12-11 | 重庆大学 | Friction nanometer generator self-driven mass sensor based on one-dimensional under-damped motion mode |
| CN113504135A (en) * | 2021-06-24 | 2021-10-15 | 昆山市建设工程质量检测中心 | Method for judging whether grouting material in grouting hole of sleeve slips or not under impact |
| CN113981841A (en) * | 2021-11-24 | 2022-01-28 | 山东交通学院 | Curved surface pier column tapping sampling grouting reinforcement device and reinforcement method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105865568A (en) * | 2016-04-12 | 2016-08-17 | 北京市建筑设计研究院有限公司 | Device for nondestructive quantitative detection of steel bar connecting grouting sleeve |
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| CN107328921A (en) * | 2017-05-11 | 2017-11-07 | 中国建筑股份有限公司 | A kind of grout sleeve grouting material plumpness detection means and method |
| CN107478512A (en) * | 2017-08-01 | 2017-12-15 | 上海市建筑科学研究院 | A kind of detection means and detection method of sleeve grouting quality |
| CN107478512B (en) * | 2017-08-01 | 2019-09-13 | 上海市建筑科学研究院 | A kind of detection device and detection method of sleeve grouting quality |
| CN107529614A (en) * | 2017-09-29 | 2018-01-02 | 长安大学 | A kind of health monitoring systems and method of prefabricated assembling type reinforced sleeve connector |
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| 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 |
| CN109991398A (en) * | 2019-01-03 | 2019-07-09 | 北京中建建筑科学研究院有限公司 | Device and method for detecting grouting fullness of steel bar sleeve |
| CN110514736A (en) * | 2019-07-23 | 2019-11-29 | 中建三局集团有限公司 | A kind of monitoring device and its application method of assembled steel reinforced sleeve grouting compactness |
| CN110455914A (en) * | 2019-08-16 | 2019-11-15 | 哈尔滨全感科技有限公司 | Be in the milk condition detection method inside grout sleeve based on built-in piezo ceramic element |
| CN111744822A (en) * | 2020-07-30 | 2020-10-09 | 福建江夏学院 | Nondestructive testing system for testing assembly type concrete structural part |
| CN112014548A (en) * | 2020-08-04 | 2020-12-01 | 上海建工集团股份有限公司 | Slurry filling fullness detection device and method in mechanical sleeve grouting construction stage |
| CN112067094A (en) * | 2020-09-09 | 2020-12-11 | 重庆大学 | Friction nanometer generator self-driven mass sensor based on one-dimensional under-damped motion mode |
| CN113504135A (en) * | 2021-06-24 | 2021-10-15 | 昆山市建设工程质量检测中心 | Method for judging whether grouting material in grouting hole of sleeve slips or not under impact |
| CN113981841A (en) * | 2021-11-24 | 2022-01-28 | 山东交通学院 | Curved surface pier column tapping sampling grouting reinforcement device and reinforcement method |
| CN113981841B (en) * | 2021-11-24 | 2023-08-22 | 山东交通学院 | Curved surface pier stud perforating sampling grouting reinforcement device and reinforcement method |
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