CN106501368B - A kind of sound detecting pipe buckling phenomenon recognition methods for pile detection sound wave transmission method - Google Patents
A kind of sound detecting pipe buckling phenomenon recognition methods for pile detection sound wave transmission method Download PDFInfo
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- CN106501368B CN106501368B CN201611251975.7A CN201611251975A CN106501368B CN 106501368 B CN106501368 B CN 106501368B CN 201611251975 A CN201611251975 A CN 201611251975A CN 106501368 B CN106501368 B CN 106501368B
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- 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
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/011—Velocity or travel time
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/102—Number of transducers one emitter, one receiver
Abstract
The invention belongs to engineering measurement fields, disclose a kind of sound detecting pipe buckling phenomenon recognition methods for pile detection sound wave transmission method, it include: successively to measure the real-time acoustic signals of longitudinal profile each point using low pass acquisition, broadband response and reception technique, obtain complete section surface wave speed variation diagram；Fourier transformation is carried out to the acoustic signals, obtains complete section face acoustic signals frequency domain figure；Each point, which is calculated, according to the velocity of wave variation diagram and design stake diameter estimates characteristic frequency；Each tested point is found in the complete section face acoustic signals frequency domain figure estimates actual characteristic frequency near characteristic frequency；If certain region actual measurement velocity of wave deviates considerably from normal value in the section velocity of wave variation diagram, and characteristic frequency still and estimates that characteristic frequency is close, then the region is that sound detecting pipe is bent in the acoustic signals frequency domain figure, unrelated with pile quality；The method of the present invention solves the problems, such as that the insoluble bend pipe effect of traditional acoustic transmission beam method causes, and avoids the loss that erroneous judgement misjudgement may cause engineering.
Description
Technical field
The invention belongs to engineering measurement fields, more particularly, to a kind of sounding for pile detection sound wave transmission method
Pipe buckling phenomenon recognition methods.
Background technique
During ultrasonic wave passes through concrete medium, medium performance itself and structure can be to the various acoustics of acoustic signals
Parameter has an impact.At this stage, the parameters,acoustic generally investigated in RC axial loading column has velocity of wave, amplitude, frequency and wave
Shape.
The variation of acoustic velocity: the speed that sound wave is propagated in the different concrete of material is different.Under normal circumstances, coagulation
The internal structure of soil-structure interactions is finer and close, and elasticity modulus is higher, and porosity is lower, then the intensity of the velocity of wave of sound wave and concrete
It is higher；Sound wave is propagated in inside concrete, when encountering defect (cavity, concrete disintegration, necking down, locally loose etc.), received wave
It is greater than normal portions when sound.
The variation of sonic wave amplitude: due to interference of the subsequent wave by superposition ripple of received wave, will affect analysis as a result, because
This, sonic wave amplitude is often referred to the amplitude of Mintrop wave.Energy attenuation after the amplitude of received wave passes through concrete medium to sound wave is related,
And the size to decay can reflect the intensity of concrete in certain degree.The wave amplitude of received wave is lower, and sound wave passes through concrete
Attenuation degree it is more serious.When ultrasonic wave inside concrete propagate, encounter defect (cavity, concrete disintegration, necking down, office
Portion is loose etc.), amplitude decline.Wave amplitude can be observed directly in the waveform diagram of received wave very much, be ceased with the quality of concrete
Manner of breathing closes, and the induction to concrete defect is also stronger, therefore wave amplitude is to judge the critically important parameter of concrete defect.
The variation of pulse domain frequency: the impulse wave in ultrasound examination be the multifrequency containing many different frequency ingredients
Wave.This multifrequency wave is after passing through concrete medium, and the wave attenuation degree of different frequency ingredient is different, and frequency is higher, and decay journey
It spends bigger.With the increase of Acoustic Wave Propagation distance, the amount of high frequency section is fewer and fewer, and the basic frequency of received wave is caused to reduce.When
So, other than propagation distance, when sound wave encounters defect in communication process, the decaying aggravation of wave causes the dominant frequency of received wave
Rate can be also remarkably decreased.
The variation of acoustic waveform: impulse wave propagated in concrete encounter defect can the interface of defect occur reflection,
Refraction and diffraction etc., the time that a variety of different waves receive energy converter since propagation path difference reaches is different, leads to different phases
The wave of position and frequency is superimposed, to make the wave distortion of received wave.So the waveform variation of received wave is also to judge coagulation
The foundation of native defect.
Sound wave transmission method detection technique is used to detect the integrality of cast-in-place concrete pile.Before foundation pile pore-forming, coagulation pile,
Pre-buried several sound detecting pipes emit as sound wave and receive the lower channel of energy converter inside pile body, after concrete strength is up to standard
Start to detect, the longitudinal direction with sonic wave detector along stake is detected point by point from bottom to top with a fixed spacing.By being passed through to sound wave
Processing, the analysis of the waveform and parameters,acoustic in each section of pile body, to infer the integrality of pile concrete, determine defect
Position, range, degree.However sound wave transmission method detects pile body integrity field instantly, sound detecting pipe when bending phenomenon occurs with it is mixed
Often there is identical test signal when there are quality problems in solidifying soil pile body, is difficult to differentiate between in analysis.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides one kind to be based on pile detection acoustic wave transmission
The sound detecting pipe buckling phenomenon recognition methods of method, thus solves the problems, such as not identifying sound detecting pipe buckling phenomenon in the prior art.
The present invention provides a kind of sound detecting pipe buckling phenomenon recognition methods based on pile detection sound wave transmission method, the side
Method includes:
Using the low pass acquisition technique and broadband reception technique of sonic apparatus, successively complete section face obtains transmitting transducer and connects
The 500Hz of plane survey line where receiving energy converter obtains complete section face actual measurement acoustic signals with super band acoustic signals；
Acoustic signals are surveyed for the complete section face, calculate real-time acoustic velocity, while obtaining complete section face and being averaged velocity of wave, and
Obtain complete section surface wave speed variation diagram；
Fourier transformation is carried out for complete section face actual measurement acoustic signals, obtains complete section face acoustic signals spectrogram；
It is averaged velocity of wave according to Known designs stake diameter and the complete section face, calculates the characteristic frequency of estimating of each point, and using carving
Degree is continuously identified automatically in the complete section face acoustic signals spectrogram；
According to the complete section face acoustic signals spectrogram, the corresponding reality of resonance peak is found near characteristic frequency in described estimate
Border characteristic frequency, the mark being automatically performed described in modification form actual characteristic Frequency Identification figure；
Velocity of wave abnormal area in the complete section surface wave speed variation diagram is extracted, and is carried out with the actual characteristic Frequency Identification figure
It compares, distinguishes bend pipe effect and pile defect.
In one embodiment of the present of invention, the sonic apparatus and reception energy converter can receive the sound wave letter of 500Hz or more
Number.
In one embodiment of the present of invention, to ensure broadband response and reception ability, transmitting transducer used and reception
Energy converter cannot use identical resonance peak, and transmitting transducer resonance peak, which must not be higher than, receives the three of energy converter resonance peak frequency values
/ bis-.
In one embodiment of the present of invention, acoustic signals are surveyed for the complete section face, calculate real-time velocity of wave, obtain complete section
Surface wave speed variation diagram, and complete section face is calculated and is averaged velocity of wave, specifically:
Acoustic signals are surveyed for the complete section face, according to then with sound detecting pipe tube spacing, calculating real-time acoustic velocity, root
Complete section face is obtained according to the real-time velocity of wave average computation of each tested point to be averaged velocity of wave, while obtaining complete section surface wave speed variation diagram.
In one embodiment of the present of invention, Fourier transformation is carried out for complete section face actual measurement acoustic signals, is obtained complete
Section acoustic signals spectrogram, specifically:
The real-time acoustic signals in complete section face are obtained using sonic apparatus, and carry out complete section face Fourier transformation, it is each to obtain complete section face
Tested point acoustic signals spectrogram.
In one embodiment of the present of invention, according to complete section face sound wave complete section face be averaged velocity of wave and design stake diameter calculate it is each to be measured
Point estimates characteristic frequency, and is continuously identified automatically in the complete section face acoustic signals spectrogram using scale, specifically
Are as follows:
Utilize formula fm=kca/2DdThat seeks estimates characteristic frequency, wherein fmCharacteristic frequency value is estimated for what is sought, k is
Correction factor takes, k=1.0, CaIt is averaged velocity of wave for complete section face, DdFor Known designs stake diameter；
Characteristic frequency is estimated according to described, is sequentially marked point by point automatically in the complete section face acoustic signals spectrogram
Know.
In one embodiment of the present of invention, according to the complete section face acoustic signals spectrogram, characteristic frequency is estimated described
Value nearby finds actual characteristic frequency values, and the mark being automatically performed described in modification forms actual characteristic Frequency Identification figure, specifically
Are as follows:
In the complete section face acoustic signals spectrogram, resonance peak is searched near characteristic frequency in described estimate, and is obtained true
Positive characteristic frequency is simultaneously identified, and actual characteristic Frequency Identification figure is formed.
In one embodiment of the present of invention, extract velocity of wave abnormal area in the complete section surface wave speed variation diagram, and with it is described
Actual characteristic Frequency Identification figure is compared, and distinguishes bend pipe effect and pile defect, specifically:
Compare the complete section surface wave speed variation diagram and the actual characteristic Frequency Identification figure, if anomaly of wave velocity region is practical
Characteristic frequency is normal, then belongs to bend pipe effect, and anomaly of wave velocity is unrelated with pile quality；If the relatively low region actual characteristic frequency of velocity of wave
Rate estimates 10% or more characteristic frequency described in being higher by simultaneously, then the relatively low region of the velocity of wave has pile quality.
In general, it since cast-in-place concrete pile is due to underground construction factor, can not observe, pile quality must pass through
Test determines that, relative to other existing test methods, the accuracy of sound wave transmission method is higher.For due to occurring in test
May the abnormal signal as caused by sound detecting pipe bend pipe or concrete pile body quality problems be difficult to differentiate between；Test result often because
People and it is different, with very big human factor, inevitably cause inevitably to dispute on, or even also occur erroneous judgement.This method benefit
The problem of testing instantly is largely solved with frequency-domain analysis method, so that due to sound detecting pipe bend pipe or mixing
Abnormal signal caused by solidifying soil pile quality problem is easier to analyze and determine have higher Feasible degree, to advantageously ensure that work
Cheng Zhiliang and the development for promoting industry.
Detailed description of the invention
Fig. 1 is the sound detecting pipe buckling phenomenon recognition methods that pile detection sound wave transmission method is used in the embodiment of the present invention；
Fig. 2 is in the embodiment of the present invention routinely to the schematic illustration of the method for survey；
Fig. 3 is a kind of structural schematic diagram of sonic wave detector in the embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram of circular ring type radial transducer in the embodiment of the present invention；
Fig. 5 is the structural schematic diagram that Model No.1 bored concrete pile is tested in the embodiment of the present invention；
Fig. 6 is the structural schematic diagram of No. 2 bored concrete piles of test model in the embodiment of the present invention；
Fig. 7 is sound detecting pipe bend pipe and defect schematic diagram in the embodiment of the present invention；
Fig. 8 is that test tube surveys velocity of wave-depth curve synoptic diagram to be measured in the embodiment of the present invention；
Fig. 9 is that test tube calculates stake diameter-depth to be measured curve synoptic diagram in the embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
As shown in Figure 1, to solve the above-mentioned problems, the embodiment of the invention provides one kind to be based on pile detection acoustic wave transmission
The sound detecting pipe buckling phenomenon recognition methods of method, the velocity of wave at certain measurement position is obvious abnormal when other normal values of wave speed, meter
It calculates and estimates characteristic frequency value at the measurement position, and according to estimating characteristic frequency and acoustic signals frequency domain figure judges, if
There is bend pipe or pile defect.Described method includes following steps:
Using the low pass acquisition technique and broadband reception technique of sonic apparatus, successively complete section face obtains transmitting transducer and connects
The 500Hz of plane survey line where receiving energy converter obtains complete section face actual measurement acoustic signals with super band acoustic signals；
Acoustic signals are surveyed for the complete section face, calculate real-time acoustic velocity, while obtaining complete section face and being averaged velocity of wave, and
Obtain complete section surface wave speed variation diagram；
Fourier transformation is carried out for complete section face actual measurement acoustic signals, obtains complete section face acoustic signals spectrogram；
It is averaged velocity of wave according to Known designs stake diameter and the complete section face, calculates the characteristic frequency of estimating of each point, and using carving
Degree is continuously identified automatically in the complete section face acoustic signals spectrogram；
According to the complete section face acoustic signals spectrogram, the corresponding reality of resonance peak is found near characteristic frequency in described estimate
Border characteristic frequency, the mark being automatically performed described in modification form actual characteristic Frequency Identification figure；
Velocity of wave abnormal area in the complete section surface wave speed variation diagram is extracted, and is carried out with the actual characteristic Frequency Identification figure
It compares, distinguishes bend pipe effect and pile defect.
Test method in the embodiment of the present invention is routine as shown in Figure 2 to the method for survey, specifically:
A) apparatus selection and parameter setting
Using the low pass acquisition technique and broadband reception technique of sonic apparatus, successively complete section face obtains transmitting transducer and connects
The 500Hz of plane survey line where receiving energy converter obtains complete section face actual measurement acoustic signals with super band acoustic signals；
Testing used instrument is nonmetal ultrasonic detector as shown in Figure 3, equipped with circular ring type diameter as shown in Figure 4
To energy converter, transmitting transducer dominant frequency is respectively 40kHz, 60kHz, and reception energy converter dominant frequency is 60kHz.Measured signal by
1#, 2# circle stake (as shown in Figure 5, Figure 6) sound wave transmission method detection obtain.Instrument parameter setting are as follows: sampling pace 10cm, sampling
Points are 2048, and the sampling interval is 3 μ s, and passband is set as 10Hz-60kHz, delay time 0 μ s, emitting voltage 500v, are believed
Number post-processing use ultrasonic analysis system software.
Wherein, the sonic apparatus and reception energy converter, can receive the acoustic signals of 500Hz or more.In addition, to ensure width
Frequency response and reception ability, transmitting transducer used and reception energy converter cannot use identical resonance peak, transmitting transducer
Resonance peak, which must not be higher than, receives 2/3rds of energy converter resonance peak frequency values.
(B) experimental method
Acoustic signals are surveyed for the complete section face, calculate real-time acoustic velocity, while obtaining complete section face and being averaged velocity of wave, and
Obtain complete section surface wave speed variation diagram；
Conventional that the energy converter transmitting that dominant frequency is 40kHz, 60kHz is respectively adopted to survey, dominant frequency is that the energy converter of 60kHz connects
It receives, acquires two groups of stimulus.
(C) data processing
A judges whether velocity of wave is abnormal
Fourier transformation is carried out for complete section face actual measurement acoustic signals, obtains complete section face acoustic signals spectrogram；
Acoustic signals are surveyed for the complete section face, according to then with sound detecting pipe tube spacing, calculating real-time acoustic velocity, obtain
Complete section face acoustic velocity variation diagram is obtained, judges that velocity of wave compares place experience velocity of wave and whether other actual measurement velocities of wave are abnormal.
Specifically, acoustic signals are surveyed for the complete section face, according to then with sound detecting pipe tube spacing, calculating real-time sound wave
Velocity of wave obtains complete section face according to the real-time velocity of wave average computation of each tested point and is averaged velocity of wave, while obtaining complete section surface wave speed variation diagram.
Characteristic frequency is estimated in b determination
It is averaged velocity of wave according to Known designs stake diameter and the complete section face, calculates the characteristic frequency of estimating of each point, and using carving
Degree is continuously identified automatically in the complete section face acoustic signals spectrogram；
Specifically, measuring point is calculated by formula and estimates characteristic frequency fm=kca/2Dd, DdFor design diameter, wherein fmTo seek
Estimate characteristic frequency value, k is that correction factor takes k=1.0, caIt is averaged velocity of wave for complete section face；Characteristic frequency is estimated according to described,
Sequentially identified point by point automatically in the spectrogram of the complete section face.
C determines actual characteristic frequency
According to the complete section face acoustic signals spectrogram, the corresponding reality of resonance peak is found near characteristic frequency in described estimate
Border characteristic frequency, the mark being automatically performed described in modification form actual characteristic Frequency Identification figure；
Specifically, in the complete section face high-precision spectrogram, resonance peak is searched near characteristic frequency in described estimate, is obtained
Real characteristic frequency is taken, and is identified.
D identifies sound detecting pipe buckling phenomenon
The region anomaly of wave velocity, and there is no variation, then the anomaly of wave velocity categories substantially for the actual characteristic frequency
It is unrelated with pile quality in bend pipe effect；The region velocity of wave is relatively low, and at the same time, the actual characteristic frequency is higher by setting
Threshold value then belongs to pile quality problem.
Velocity of wave abnormal area in the complete section surface wave speed variation diagram is extracted, and is carried out with the actual characteristic Frequency Identification figure
It compares, distinguishes bend pipe effect and pile defect.
As shown in fig. 7, there is the case where defect for pile concrete, defect includes cavity, concrete disintegration, necking down, office
Portion is loose etc..Sound detecting pipe bend pipe is then to cause sound detecting pipe position in same section steel reinforcement cage due to the aspect that designs or construct
Set the opposite offset of appearance.Strictly speaking sound detecting pipe bend pipe not defect, but the signal that pipe bent position detects often is shown
The feature of rejected region, pipe bent position are asked using preset tube spacing at this time since measuring point spacing increase causes sound wave then to increase
Velocity of wave out can undoubtedly reduce, and equally also will appear the feelings of velocity of wave decline when tube spacing is normal but pile body inside existing defects
Condition, the two measured signal respectively have the similarities and differences, to accurately distinguish certain difficulty.Subtract suddenly for occurring velocity of wave in Practical Project
How small situation judges that pile body inner case always is engineering emphasis and difficult point at this time.Frequency domain analysis can be very good to solve
Certainly this engineering roadblock.
Specifically, the complete section surface wave speed variation diagram and the actual characteristic Frequency Identification figure, if anomaly of wave velocity
Region actual characteristic frequency is normal, then belongs to bend pipe effect, and anomaly of wave velocity is unrelated with pile quality；If the relatively low region of velocity of wave is real
Height is higher by threshold value to border characteristic frequency simultaneously, then belongs to pile quality problem.Specifically, this threshold value can be set according to the actual situation
It is fixed, it is not specifically limited herein.
Such as can be set to 10%, when the frequency domain value for the peak point that frequency domain occurs estimates characteristic frequency domain value phase with described
To error within 10% (including 10%), it can be determined that be sound detecting pipe bend pipe, when frequency domain occur peak point frequency domain value with
Described estimates characteristic frequency domain value relative error 10% or more, judges that defect occurs in pile concrete.
Illustrate that the present invention is based on the methods that sound wave transmission method characteristic frequency domain judges bend pipe effect below in conjunction with specific embodiment.
Frequency-domain analysis method engineer application 2- distinguishes cast-in-place concrete pile bend pipe and defect
Judgment step:
A reads real-time wave velocity C ' very little that instrument measures certain position to be measured, the normal C of rest part velocity of wave.
B substitutes into design stake diameter DdGo out with normal wave velocity C retrospectively calculate and estimates characteristic frequency value fm。
C carries out frequency domain conversion to time-domain signal, if estimating characteristic frequency value fmNearby then illustrate occur there are peak point
Bend pipe, pile quality there is no problem need to treat location set velocity of wave carry out bend pipe amendment.If there are exception and characteristic peaks in frequency domain
Point fm' be much larger than discreet value, then illustrate existing defects inside pile body.
By taking No. 2 bored concrete piles as an example, 3-4 section surveys the velocity of wave-" U "-shaped bending of depth curve to be measured, such as Fig. 8 institute
Show.Position and speed to be measured, which constantly declines slowly to rise after 5m or so reaches extreme value, restores normal, can not only sentence with time-domain signal
The phenomenon of breaking is caused by bend pipe or defect.To measured time-domain signal carry out Spectrum Conversion and according to above-mentioned 3 steps into
Row judgement, along depth direction uniform extraction section position to be measured at a certain distance.Characteristic frequency is read in figure and calculates stake
Diameter, the results are shown in Table 1.
1 section 3-4 of table position calculated result to be measured
In the case where stake diameter is constant, signal frequency domain is not by position effect of distance to be measured, if in other words under 3-4 section velocity of wave
Drop is to be caused by pipe away from increase (bend pipe), answers normal and characteristic value to stablize in a certain frequency or so then it receives signal frequency domain.
Otherwise exception, which occurs, in frequency-region signal then illustrates existing defects inside pile body.
It is placed at 3.9m according to No. 2 stake design drawing baffles, known to comparative test result when depth to be measured is lower than 3.9m
Velocity of wave, frequency domain and calculating stake diameter are normal (depth 2.1m such as to be measured), velocity of wave, frequency when depth to be measured is greater than 3.9m
Domain and calculating stake diameter are abnormal, calculate diameter-depth curve such as Fig. 8.It is recorded according to Model Pile design drawing and site operation, No. 2
Stake sound detecting pipe and inner steel bar cage be to be welded and fixed, it is impossible to there is bend pipe, thus must be at pile crown be arranged baffle and
Sandbag hinders filling concrete and causes lower part defect.Carrying out comprehensive descision according to frequency domain information can learn inside pile body occur
Defect rather than bend pipe, Fig. 9 calculated result effective pile diameter, which constantly reduces, more demonstrates this saying.It is easy to using conventional method
The signal is judged as bend pipe and then carries out the final defect of failing to judge of speed amendment, it is seen that sound wave transmission method frequency domain analysis can be effective
Distinguish defect and bend pipe.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (7)
1. a kind of sound detecting pipe buckling phenomenon recognition methods for pile detection sound wave transmission method, which is characterized in that the method
Include:
Using the low pass acquisition technique and broadband reception technique of sonic apparatus, successively complete section face obtains transmitting transducer and reception is changed
The 500Hz of plane survey line where energy device obtains complete section face actual measurement acoustic signals with super band acoustic signals；
Acoustic signals are surveyed for the complete section face, calculate real-time velocity of wave, while obtaining complete section face and being averaged velocity of wave, and obtaining complete section
Surface wave speed variation diagram；
Fourier transformation is carried out for complete section face actual measurement acoustic signals, obtains complete section face acoustic signals spectrogram；
It is averaged velocity of wave according to Known designs stake diameter and the complete section face, calculates the characteristic frequency of estimating of each point, and exist using scale
It is continuously identified automatically in the complete section face acoustic signals spectrogram；
According to the complete section face acoustic signals spectrogram, the corresponding practical spy of resonance peak is found near characteristic frequency in described estimate
Frequency is levied, the mark being automatically performed described in modification forms complete section face actual characteristic Frequency Identification figure；
Extract velocity of wave abnormal area in the complete section surface wave speed variation diagram, and with the complete section face actual characteristic Frequency Identification figure into
Row compares, and distinguishes bend pipe effect and pile defect, specifically includes: the complete section surface wave speed variation diagram and the complete section face are real
Characteristic frequency mark figure in border belongs to bend pipe effect if anomaly of wave velocity region actual characteristic frequency is normal, anomaly of wave velocity with
Pile quality is unrelated；If the relatively low region actual characteristic frequency of velocity of wave estimates 10% or more characteristic frequency, institute described in being generally higher by
Stating the relatively low region of velocity of wave has pile quality.
2. being used for the sound detecting pipe buckling phenomenon recognition methods of pile detection sound wave transmission method, feature as described in claim 1
It is, the sonic apparatus and reception energy converter can receive the acoustic signals of 500Hz or more.
3. it is used for the sound detecting pipe buckling phenomenon recognition methods of pile detection sound wave transmission method as claimed in claim 1 or 2, it is special
Sign is that, to ensure broadband response and reception ability, transmitting transducer used and reception energy converter cannot use identical humorous
Shake peak, and transmitting transducer resonance peak, which must not be higher than, receives 2/3rds of energy converter resonance peak frequency values.
4. it is used for the sound detecting pipe buckling phenomenon recognition methods of pile detection sound wave transmission method as claimed in claim 1 or 2, it is special
Sign is, surveys acoustic signals for the complete section face, calculates real-time velocity of wave, obtains complete section surface wave speed variation diagram, and calculate
It is averaged velocity of wave to complete section face, specifically:
Acoustic signals are surveyed for the complete section face, according to then with sound detecting pipe tube spacing, real-time velocity of wave being calculated, according to each to be measured
The real-time velocity of wave average computation of point obtains complete section face and is averaged velocity of wave, while obtaining complete section surface wave speed variation diagram.
5. it is used for the sound detecting pipe buckling phenomenon recognition methods of pile detection sound wave transmission method as claimed in claim 1 or 2, it is special
Sign is, carries out Fourier transformation for complete section face actual measurement acoustic signals, obtains complete section face acoustic signals spectrogram, specifically
Are as follows:
The real-time acoustic signals in complete section face are obtained using the sonic apparatus, and carry out complete section face Fourier transformation, it is each to obtain complete section face
Tested point acoustic signals spectrogram.
6. it is used for the sound detecting pipe buckling phenomenon recognition methods of pile detection sound wave transmission method as claimed in claim 1 or 2, it is special
Sign is, is averaged according to complete section face and velocity of wave and designs the characteristic frequency of estimating that stake diameter calculates each tested point, and using scale in institute
It states and is continuously identified automatically in the acoustic signals spectrogram of complete section face, specifically:
Utilize formula fm=kca/2DdThat seeks estimates characteristic frequency, wherein fmCharacteristic frequency value is estimated for what is sought, k is amendment
Coefficient takes, k=1.0, caIt is averaged velocity of wave for complete section face, DdFor Known designs stake diameter.
7. it is used for the sound detecting pipe buckling phenomenon recognition methods of pile detection sound wave transmission method as claimed in claim 1 or 2, it is special
Sign is, according to the complete section face acoustic signals spectrogram, actual characteristic frequency is found near characteristic frequency value in described estimate
It is worth, the mark being automatically performed described in modification forms actual characteristic Frequency Identification figure, specifically:
In the complete section face acoustic signals spectrogram, resonance peak is searched near characteristic frequency in described estimate, and is obtained real
Characteristic frequency is simultaneously identified, and complete section face actual characteristic Frequency Identification figure is formed.
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| CN109115884B (en) * | 2018-09-27 | 2020-10-09 | 广州市建筑科学研究院有限公司 | Foundation pile integrity detection system based on sound wave transmission method |
| CN113076817B (en) * | 2021-03-17 | 2022-11-04 | 上海展湾信息科技有限公司 | Weld pore defect real-time detection method and system |
| CN113431107B (en) * | 2021-07-27 | 2022-05-13 | 陈皋 | Method for detecting cast-in-place pile by correcting distance between sound measuring tubes in cast-in-place pile through vector model |
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