CN106767583A - For the longitudinal profile Equivalent Pile footpath computational methods of pile detection sound wave transmission method - Google Patents
For the longitudinal profile Equivalent Pile footpath computational methods of pile detection sound wave transmission method Download PDFInfo
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- CN106767583A CN106767583A CN201611252244.4A CN201611252244A CN106767583A CN 106767583 A CN106767583 A CN 106767583A CN 201611252244 A CN201611252244 A CN 201611252244A CN 106767583 A CN106767583 A CN 106767583A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/06—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring contours or curvatures
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Abstract
The invention belongs to engineering survey field, a kind of longitudinal profile Equivalent Pile footpath computational methods for pile detection sound wave transmission method are disclosed, including：Using low pass acquisition technique and broadband reception technique, the real-time acoustic signals of section each point are measured successively, obtain section velocity of wave variation diagram；And Fourier transformation is carried out, obtain section acoustic signals spectrogram；Each point is calculated according to velocity of wave variation diagram and design stake footpath and estimates characteristic frequency, each tested point found in spectrogram and estimates actual characteristic frequency near characteristic frequency；According to section velocity of wave variation diagram and the actual characteristic Frequency Identification figure, each measuring point stake footpath of reference section obtains each measuring point stake footpath variation diagram of section；The stake footpath that same cross section difference survey line is obtained is compared and averagely, the average equivalent stake footpath in the section is obtained, new section Equivalent Pile footpath variation diagram is constituted, Equivalent Pile footpath is drawn with depth change curve.The inventive method compensate for vacancy of the pile measurement industry in cast-in-place concrete pile stake footpath detection.
Description
Technical field
The invention belongs to engineering survey field, stake footpath is calculated based on acoustic wave transmission frequency-domain analysis more particularly, to one kind
Method.
Background technology
During ultrasonic wave passes through concrete medium, performance and structure can be to the various acoustics of acoustic signals in itself for medium
Parameter produces influence.At this stage, the general parameters,acoustic investigated has velocity of wave, amplitude, frequency and ripple in RC axial loading column
Shape.
The change of velocity of wave：The speed that sound wave is propagated in the different concrete of material is different.Generally, concrete is situated between
The internal structure of matter is finer and close, and elastic modelling quantity is higher, and porosity is lower, then the velocity of wave of sound wave and the intensity of concrete are also got over
It is high；Sound wave is propagated in inside concrete, when running into defect (cavity, concrete disintegration, necking down, local loose etc.), reception wave sound
When be more than normal portions.
The change of sonic wave amplitude：Because the follow-up ripple of received wave is disturbed by superposition ripple, meeting impact analysis result, because
This, sonic wave amplitude is often referred to the amplitude of Mintrop wave.The amplitude of received wave is related through the energy attenuation after concrete medium to sound wave,
And the size for decaying 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 is propagated in inside concrete, defect (cavity, concrete disintegration, necking down, office are run into
Portion is loose etc.), amplitude declines.Wave amplitude can be observed directly in the oscillogram of received wave very much, and the quality with concrete ceases
Manner of breathing is closed, and the sensing to concrete defect is also stronger, therefore wave amplitude is to judge the critically important parameter of concrete defect.
The change of pulse domain frequency：It is the multifrequency containing many different frequency compositions that impulse wave in ultrasound examination is
Ripple.After through concrete medium, the wave attenuation degree of different frequency composition is different, and frequency is higher for this multifrequency ripple, and decay journey
Degree is bigger.As the increase of Acoustic Wave Propagation distance, the amount of HFS are fewer and feweri, causing the basic frequency of received wave reduces.When
So, in addition to propagation distance, when sound wave runs into defect in communication process, the decay aggravation of ripple causes the dominant frequency of received wave
Rate can also be remarkably decreased.
The change of acoustic waveform：Impulse wave propagated in concrete run into defect can defect interface occur reflection,
Refraction and diffraction etc., a variety of ripples are different due to the propagation path different times for reaching receive transducer, cause different phases
The ripple of position and frequency is superimposed, so that the wave distortion of received wave.So, the waveform change 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 are used as acoustic emission and the lower channel of receive transducer inside pile body, after concrete strength is up to standard
Start detection, detected with determining deviation pointwise from bottom to top along the longitudinal direction of stake with sonic wave detector.Passed through by sound wave
The treatment of the waveform and parameters,acoustic in each section of pile body, analysis, so as to infer the integrality of pile concrete, determine defect
Position, scope, degree.But sound wave transmission method detects pile body integrity field instantly, not yet there is the proposition actual pile body of test straight
The vantageous methods in footpath.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, acoustic wave transmission frequency-domain analysis is based on the invention provides one kind
The method for calculating stake footpath, the scheme its object is to propose to test actual pile body diameter, thus solves to survey in the prior art
The technical problem of the actual pile body diameter of examination.
To achieve the above object, the invention provides a kind of longitudinal profile Equivalent Pile for pile detection sound wave transmission method
Footpath computational methods, it is characterised in that methods described includes：
Using the low pass acquisition technique and broadband reception technique of sonic apparatus, complete section face obtains transmitting transducer and connects successively
The 500Hz of plane survey line where transducer is received with super band acoustic signals；
Acoustic signals are surveyed for the complete section face, each real-time velocity of wave of tested point is calculated, complete section face velocity of wave variation diagram is obtained；
Fourier transformation is carried out for complete section face actual measurement acoustic signals, complete section face acoustic signals spectrogram is obtained；
According to Known designs stake footpath and the real-time velocity of wave of the tested point, the characteristic frequency of estimating of each point is calculated, and using quarter
Degree is continuously identified automatically in the complete section face acoustic signals spectrogram；
According to the complete section face acoustic signals spectrogram, found near characteristic frequency actual characteristic frequency in described estimating,
The mark being automatically performed described in modification forms actual characteristic Frequency Identification figure；
According to the complete section face velocity of wave variation diagram and the actual characteristic Frequency Identification figure, each measuring point stake in complete section face is calculated
Footpath, obtains each measuring point stake footpath variation diagram in complete section face；
According to each measuring point stake footpath variation diagram that different sections are obtained, the stake footpath that same cross section difference survey line is obtained is carried out
Compare and averagely, obtain the average stake footpath in the section, constitute new complete section face stake footpath variation diagram, draw stake footpath with change in depth
Curve.
In one embodiment of the present of invention, the sonic apparatus and receive transducer, the signal for receiving more than 500Hz.
In one embodiment of the present of invention, to ensure broadband response and receiving ability, transmitting transducer used and reception
Transducer can not use identical resonance peak, and transmitting transducer resonance peak must not be higher than the three of receive transducer resonance peak frequency values
/ bis-.
In one embodiment of the present of invention, acoustic signals are surveyed for the complete section face, calculate each real-time velocity of wave of tested point,
Specially：
Survey acoustic signals for the complete section face, according to then with sound detecting pipe tube pitch, calculate real-time velocity of wave, obtain complete
Section velocity of wave variation diagram.
In one embodiment of the present of invention, Fourier transformation is carried out for complete section face actual measurement acoustic signals, obtain complete
Section acoustic signals spectrogram, specially：
The 500Hz in real-time acoustic signals using sonic apparatus to each position to be measured of correspondence that the receive transducer is obtained
Above frequency band signals carry out the Fourier transformation in complete section face, obtain the complete section face acoustic signals spectrogram of each tested point.
In one embodiment of the present of invention, according to the real-time velocity of wave and design of each measuring point in the complete section face velocity of wave variation diagram
What stake footpath calculated each respective point estimates characteristic frequency, and is carried out automatically in the complete section face acoustic signals spectrogram using scale
Continuous mark, specially：
Using formula fm=kc/2DdAsk for tested point and estimate characteristic frequency, wherein fmIt is the characteristic frequency of estimating asked for, k
For correction factor takes k=1.0, c is the real-time velocity of wave of tested point, DdIt is Known designs stake footpath；
Characteristic frequency is estimated according to described, sequentially pointwise mark is carried out 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
Nearby find actual characteristic frequency values, the modification mark being automatically performed, formation actual characteristic Frequency Identification figure, specially：
In the complete section face high accuracy spectrogram, resonance peak is searched near characteristic frequency in described estimating, obtain real
Characteristic frequency and identified, formed actual characteristic Frequency Identification figure.
It is described according to the complete section face velocity of wave variation diagram and the actual characteristic frequency mark in one embodiment of the present of invention
Know figure, calculate each measuring point stake footpath in complete section face, specially：
D '=kc/2fm′
Wherein, D ' is the actual stake footpath of the position described to be measured asked for, and k takes for correction factor, k=1.0, and c is to measure
The real-time velocity of wave of the position to be measured arrived, fm' it is the actual characteristic frequency values of the position to be measured.
In general, because cast-in-place concrete pile is due to underground construction factor, it is impossible to observe, its pile quality must pass through
Test determines that, relative to existing other method of testings, the degree of accuracy of sound wave transmission method is higher.Instantly in detection work due to
Existing sonic test technology is for that cannot detect the actual diameter of cast-in-place concrete pile；Frequency-domain analysis method is largely
Several problems more than present in compensate for testing instantly so that test result is more easy to analysis and judges, with Feasible degree higher,
So as to advantageously ensure that construction quality and promote the development of industry.Instantly in engineering practice, not to filling concrete
The test in stake stake footpath proposes effective method.The invention of this technology compensate for pile measurement industry in cast-in-place concrete pile
Vacancy in the detection of stake footpath.
Brief description of the drawings
Fig. 1 is the longitudinal profile Equivalent Pile footpath computational methods for pile detection sound wave transmission method in the embodiment of the present invention；
Fig. 2 is the conventional principle schematic to surveying method in the embodiment of the present invention；
Fig. 3 is a kind of structural representation of sonic wave detector in the embodiment of the present invention；
Fig. 4 is a kind of structural representation of circular ring type radial transducer in the embodiment of the present invention；
Fig. 5 is the structural representation of experiment Model No.1 bored concrete pile in the embodiment of the present invention；
Fig. 6 is No. 2 structural representations of bored concrete pile of test model in the embodiment of the present invention；
Fig. 7 is spectrum diagram of the 1# bored concrete piles at 4.9m in the embodiment of the present invention；
Fig. 8 is receipt signal frequency spectrum schematic diagram of the 1# bored concrete piles at 0.5m in the embodiment of the present invention；
Fig. 9 is receipt signal frequency spectrum schematic diagram of the 1# bored concrete piles at 1.3m in the embodiment of the present invention；
Figure 10 is receipt signal frequency spectrum schematic diagram of the 1# bored concrete piles at 3.1m in the embodiment of the present invention；
Figure 11 is receipt signal frequency spectrum schematic diagram of the 1# bored concrete piles at 6.0m in the embodiment of the present invention；
Figure 12 is receipt signal frequency spectrum schematic diagram of the 1# bored concrete piles at 7.6m in the embodiment of the present invention；
Figure 13 is receipt signal frequency spectrum schematic diagram of the 1# bored concrete piles at 8.5m in the embodiment of the present invention；
Figure 14 is receipt signal frequency spectrum schematic diagram of the 2# bored concrete piles at 1.1m in the embodiment of the present invention；
Figure 15 is receipt signal frequency spectrum schematic diagram of the 2# bored concrete piles at 3.0m in the embodiment of the present invention；
Figure 16 is receipt signal frequency spectrum schematic diagram of the 2# bored concrete piles at 4.5m in the embodiment of the present invention；
Figure 17 is receipt signal frequency spectrum schematic diagram of the 2# bored concrete piles at 6.7m in the embodiment of the present invention；
Figure 18 is receipt signal frequency spectrum schematic diagram of the 2# bored concrete piles at 7.4m in the embodiment of the present invention；
Figure 19 is the complete section face stake footpath variation diagram of whole pile body equivalent diameter in the embodiment of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
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 additionally, technical characteristic involved in invention described below each implementation method
Not constituting conflict each other can just be mutually combined.
Pile body actual diameter and drilling diameter in theory, also the intended diameter of stake is consistent.But often artificial or machinery
Probabilistic presence of construction, in fact it could happen that the excessive or too small phenomenon in aperture.Geology soil layer, underground water and other
Factor, caused local hole wall collapse so that pile is locally expanded, the size detection of actual cross-section diameter lacks effective
Detection method.These are all that pile body actual diameter determines problem after all, the pile body integrity of sound wave transmission method detection instantly
, not yet there is the proposition actual pile body diameter of test in field.
In order to solve the above-mentioned technical problem, acoustic wave transmission frequency-domain analysis method is based on the invention provides one kind, by pre-
First embedded sound detecting pipe tests the pile body diameter in each position section to be measured, draws the diameter of whole pile body diverse location.It is above-mentioned
Measurement result can be further used for comparing with design stake footpath, verify the local or whole pile cutoff in the range of error permission
Whether construction stake footpath meets design requirement.
Theoretical foundation：In sound wave transmission method detection filling concrete pile integrality practical application, included in received wave
Various frequency contents from low to high, a certain frequency broken in low frequency among these reacts pile body cross section information, is referred to as feature
Frequency fm′.Can be by this feature frequency utilization formula D '=kc/2fmPile body diameter D ', k are correction factor in ' calculating measuring point section
Take, k=1.0, c is the real-time velocity of wave of measuring point.
As shown in figure 1, based on the invention provides a kind of longitudinal profile Equivalent Pile footpath by pile detection sound wave transmission method
Calculation method, methods described includes：
Using the low pass acquisition technique and broadband reception technique of sonic apparatus, complete section face obtains transmitting transducer and connects successively
The 500Hz of plane survey line where transducer is received with super band acoustic signals；
Acoustic signals are surveyed for the complete section face, each real-time velocity of wave of tested point is calculated, complete section face velocity of wave variation diagram is obtained；
Fourier transformation is carried out for complete section face actual measurement acoustic signals, complete section face acoustic signals spectrogram is obtained；
According to Known designs stake footpath and the real-time velocity of wave of the tested point, the characteristic frequency of estimating of each point is calculated, and using quarter
Degree is continuously identified automatically in the complete section face acoustic signals spectrogram；
According to the complete section face acoustic signals spectrogram, found near characteristic frequency actual characteristic frequency in described estimating,
The mark being automatically performed described in modification forms actual characteristic Frequency Identification figure；
According to the complete section face velocity of wave variation diagram and the actual characteristic Frequency Identification figure, each measuring point stake in complete section face is calculated
Footpath, obtains each measuring point stake footpath variation diagram in complete section face；
According to each measuring point stake footpath variation diagram that different sections are obtained, the stake footpath that same cross section difference survey line is obtained is carried out
Compare and averagely, obtain the average stake footpath in the section, constitute new complete section face stake footpath variation diagram, draw stake footpath with change in depth
Curve.
Binding experiment first illustrates the inventive method, test method be it is as shown in Figure 2 conventional to survey method, specifically：
(A) apparatus selection and parameter setting
Experiment the use of instrument is nonmetal ultrasonic detector as shown in Figure 2, equipped with circular ring type footpath as shown in Figure 3
To transducer, transmitting transducer dominant frequency is respectively 40kHz, and receive transducer dominant frequency is 60kHz.Measured signal is justified by 1#, 2#
Stake (as shown in Figure 4, Figure 5) sound wave transmission method detection is obtained.Instrument parameter is set to：Sampling pace is 10cm, and sampling number is
2048, the sampling interval is 3 μ s, and passband is set to 10Hz-60kHz, time delay 0 μ s, emitting voltage 500v, is located after signal
Reason uses ultrasonic analysis systems soft ware.
Wherein, the receive transducer, it is desirable to be able to receive the signal of more than 500Hz.In addition, to ensure broadband response
And receiving ability, transmitting transducer used and receive transducer can not be using identical resonance peaks, and transmitting transducer resonance peak is not
Must be higher than 2/3rds of receive transducer resonance peak frequency values.
(B) experimental technique
It is conventional to surveying, using the low pass acquisition technique and broadband reception technique of sonic apparatus, complete section face is launched successively
The 500Hz of plane survey line is with super band acoustic signals where transducer and receive transducer；
(C) data processing
A obtains complete section face acoustic signals spectrogram
Acoustic signals can be surveyed for the complete section face, calculate each real-time velocity of wave of tested point, obtained complete section face velocity of wave and become
Change figure；Specifically, acoustic signals can be surveyed for the complete section face, according to then with sound detecting pipe tube pitch, calculate real-time ripple
Speed, obtains complete section face velocity of wave variation diagram.
Fourier transformation is carried out for complete section face actual measurement acoustic signals, complete section face acoustic signals spectrogram is obtained；Tool
Body ground, the 500Hz in real-time acoustic signals using sonic apparatus to each position to be measured of correspondence that the receive transducer is obtained with
Super band signal carries out the Fourier transformation in complete section face, obtains the complete section face acoustic signals spectrogram of each tested point.
B, it is determined that estimating characteristic frequency
According to Known designs stake footpath and the real-time velocity of wave of the tested point, the characteristic frequency of estimating of each point is calculated, and using quarter
Degree is continuously identified automatically in the complete section face acoustic signals spectrogram；Specifically, using formula fm=kc/2DdAsk for treating
Measuring point estimates characteristic frequency, wherein fmIt is the characteristic frequency of estimating asked for, k takes k=1.0 for correction factor, and c is that tested point is real-time
Velocity of wave, DdIt is Known designs stake footpath；Characteristic frequency is estimated according to described, sequentially the spectrogram in complete section face acoustic signals certainly
It is dynamic to carry out pointwise mark.
C, determines actual characteristic frequency
According to the complete section face acoustic signals spectrogram, found near characteristic frequency actual characteristic frequency in described estimating,
The mark being automatically performed described in modification forms actual characteristic Frequency Identification figure；Specifically, in the complete section face high accuracy spectrogram
In, resonance peak is searched near characteristic frequency in described estimating, obtain real characteristic frequency and identified, form actual characteristic
Frequency Identification figure.
D, it is determined that actual pile body diameter
According to the complete pile body section actual characteristic frequency values f for determiningm', by the actual pile body diameter D ' of formula inverse=kc/
2fm', and then different receive transducer dominant frequency are studied, and different pile body diameters, under difference range finding, calculated diameter is missed with intended diameter
Difference, verifies the correctness of computational methods.
E, draws Equivalent Pile footpath with depth change curve
It is possible to further according to the complete section face velocity of wave variation diagram and the actual characteristic Frequency Identification figure, calculate complete
Each measuring point Equivalent Pile footpath of section, obtains each measuring point Equivalent Pile footpath variation diagram in complete section face；
According to each measuring point stake footpath variation diagram that different sections are obtained, the stake footpath that same cross section difference survey line is obtained is carried out
Compare and averagely, obtain the average stake footpath in the section, constitute new complete section face stake footpath variation diagram, draw stake footpath with change in depth
Curve.
Example：
As a example by 1#, this stake footpath is 1m, and depth is that measuring point signal frequency domain is as shown in Figure 6 at 4.9m.The point surveys ripple
Fast 4265m/s, characteristic frequency estimated value is fm'=kc/2Dd=2465/ (2 × 1)=2133Hz.
It is apparent from by result figure, fmThere are three peak points near '=2133Hz, be respectively from small to large：1628Hz,
2116Hz, 2441Hz.Stake footpath calculates and is shown in Table 1.
The characteristic frequency of table 1 and calculating stake footpath
Calculated by upper table, it is seen that the presence of characteristic frequency and the correctness of computational methods.
Explanation：When a. with reference to sound, sound width, dominant frequency and time domain waveform can tentatively judge measuring point section integrality.If section
It is intact, then estimate characteristic frequency value fmIt is approximately equal to actual characteristic frequency values fm′；
B. actual measurement is proved：Complete pile cutoff part, by fm' the D ' and D for calculatingdMaximum relative error be no more than 10%, greatly
The relative error very little of most measuring points.In spectrogram, with fmThe stake footpath that ' adjacent peak point of left and right two is calculated and design stake
The relative error in footpath is more than 10%.Also, fm' as the fundamental frequency of reflection pile body diameter information, there are 2 ranks, 3 in spectrogram
Rank or even higher order peak point.Prove above：Actual characteristic frequency values fm' it is unique.
Below in conjunction with the method that the specific embodiment explanation present invention calculates stake footpath：
Acoustic wave transmission frequency-domain analysis method engineer applied 1- calculates pile body diameter
1 footpath calculation process
(1) in Known designs stake footpath DdIn the case of, read the real-time velocity of wave that instrument measures the position to be measuredc。
(2) calculate position to be measured by formula and estimate characteristic frequency fm=kc/2Dd。
(3) observation signal spectrogram low frequency part, is estimating characteristic frequency value fmNearby find actual characteristic frequency values fm′。
(4) by c and actual characteristic frequency values fm' substitute into formula D '=kc/2fm', try to achieve the stake footpath D ' at the position to be measured.
The diameter computational methods of 2 complete pile body parts
No. 2.11 bored concrete pile tests
No. 1 bored concrete pile is detected, transmitting probe dominant frequency is 40kHz, and receiving transducer dominant frequency is 60kHz, using routine
To surveying, test tube 3-4 (non-radial direction) spacing is 0.485m.
No. 1 Zhuan Zhuan footpath is 1.0m, and test tube depth is 8.5m, and 85 are once gathered altogether every 0.1m collections from stake bottom to stake top
Measured signal, frequency-domain analysis is carried out to it and each Chu Zhuan footpaths in position to be measured is calculated using the above method.Due to position data to be measured
More, the position to be measured that the depth of selection intact part is respectively at 0.5m, 1.3m, 3.1m, 6.0m, 7.6m, 8.5m calculates stake
Footpath, instrument measured signal spectrogram is as shown in figures 8-13.Read characteristic frequency in figures 8-13 according to step (1-4) and calculate stake
Footpath, its result is as shown in table 2.
The pile body of table 2 3-4 frequency-domain calculations results in position to be measured
2.2 No. 2 bored concrete pile tests
Instrument setting is constant, and No. 2 stake 1-3 test tubes are detected, its footpath is 0.8m, and test tube depth is 9.0m, from stake
Bottom gathers every 0.1m to stake top and once gathers 90 measured signals altogether, same to be analyzed using the above method.Wherein choose
Depth is under instrument measured signal spectrogram at 1.1m, 3.0m, 4.5m, 6.7m, 7.4m such as Figure 14-18 figures.
Characteristic frequency is read in figure according to step 1-4 and a footpath is calculated, its result is as shown in table 3.
The pile body of table 3 1-3 frequency-domain calculations results in position to be measured
Data above is the part position to be measured of the full pile for randomly selecting, and its footpath result of calculation is kissed with design result
Close preferable, error in the reasonable scope, because length is limited, does not arrange the result of all complete pile cutoff positions to be measured all
Go out, the result of actual measurement shows, the diameter computational methods that selection characteristic frequency calculates complete pile cutoff are correct feasible, no matter and
Along radial direction or oblique direction, preferable test result can be obtained.
Further, can also be multiple on measurement foundation pile along the radial direction of foundation pile according to the method in above-mentioned measurement stake footpath
The Equivalent Pile footpath of measuring point and the Equivalent Pile footpath to multiple measuring points are averaged acquisition average equivalent stake footpath, then to the axial weight of pile body
Multiple above-mentioned measurement process, obtains the complete section face stake footpath variation diagram of whole pile body actual diameter as shown in figure 19.
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, it is not used to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc., all should include
Within protection scope of the present invention.
Claims (8)
1. a kind of longitudinal profile Equivalent Pile footpath computational methods for pile detection sound wave transmission method, it is characterised in that the side
Method includes：
Using the low pass acquisition technique and broadband reception technique of sonic apparatus, complete section face obtains transmitting transducer and reception is changed successively
The 500Hz of plane survey line is with super band acoustic signals where energy device；
Acoustic signals are surveyed for the complete section face, each real-time velocity of wave of tested point is calculated, complete section face velocity of wave variation diagram is obtained；
Fourier transformation is carried out for complete section face actual measurement acoustic signals, complete section face acoustic signals spectrogram is obtained；
According to Known designs stake footpath and the real-time velocity of wave of the tested point, the characteristic frequency of estimating of each point is calculated, and existed using scale
Continuously identified automatically in the complete section face acoustic signals spectrogram；
According to the complete section face acoustic signals spectrogram, found near characteristic frequency actual characteristic frequency in described estimating, change
The mark being automatically performed forms actual characteristic Frequency Identification figure；
According to the complete section face velocity of wave variation diagram and the actual characteristic Frequency Identification figure, each measuring point stake footpath in complete section face is calculated, obtained
Obtain each measuring point stake footpath variation diagram in complete section face；
According to each measuring point stake footpath variation diagram in the complete section face that different sections are obtained, the stake obtained to same cross section difference survey line
Footpath is compared and averagely, obtains the average equivalent stake footpath in the section, constitutes new complete section face Equivalent Pile footpath variation diagram, draws
Equivalent Pile footpath is with depth change curve.
2. the longitudinal profile Equivalent Pile footpath computational methods of pile detection sound wave transmission method are used for as claimed in claim 1, and it is special
Levy and be, the sonic apparatus and receive transducer, the signal for receiving more than 500Hz.
3. the longitudinal profile Equivalent Pile footpath computational methods of pile detection sound wave transmission method are used for as claimed in claim 1 or 2, its
It is characterised by, to ensure broadband response and receiving ability, transmitting transducer used and receive transducer can not use identical
Resonance peak, transmitting transducer resonance peak must not be higher than 2/3rds of receive transducer resonance peak frequency values.
4. the longitudinal profile Equivalent Pile footpath computational methods of pile detection sound wave transmission method are used for as claimed in claim 1 or 2, its
It is characterised by, acoustic signals is surveyed for the complete section face, calculates each real-time velocity of wave of tested point, specially：
Survey acoustic signals for the complete section face, according to then with sound detecting pipe tube pitch, calculate real-time velocity of wave, obtain complete section face
Velocity of wave variation diagram.
5. the longitudinal profile Equivalent Pile footpath computational methods of pile detection sound wave transmission method are used for as claimed in claim 1 or 2, its
It is characterised by, Fourier transformation is carried out for complete section face actual measurement acoustic signals, obtain complete section face acoustic signals spectrogram, has
Body is：
More than the 500Hz in real-time acoustic signals using sonic apparatus to each position to be measured of correspondence that the receive transducer is obtained
Frequency band signals carry out the Fourier transformation in complete section face, obtain complete section face acoustic signals spectrogram.
6. the longitudinal profile Equivalent Pile footpath computational methods of pile detection sound wave transmission method are used for as claimed in claim 1 or 2, its
It is characterised by, each measuring point is calculated according to the real-time velocity of wave of each measuring point in the complete section face velocity of wave variation diagram and design stake footpath
Characteristic frequency is estimated, and is continuously identified automatically in the complete section face acoustic signals spectrogram using scale, specially：
Using formula fm=kc/2DdAsk for tested point and estimate characteristic frequency, wherein fmIt is the characteristic frequency of estimating asked for, k is to repair
Positive coefficient takes k=1.0, and c is the real-time velocity of wave of tested point, DdIt is Known designs stake footpath；
Characteristic frequency is estimated according to described, sequentially pointwise mark is carried out automatically in the complete section face acoustic signals spectrogram.
7. the longitudinal profile Equivalent Pile footpath computational methods of pile detection sound wave transmission method are used for as claimed in claim 1 or 2, its
It is characterised by, according to the complete section face acoustic signals spectrogram, found near characteristic frequency actual characteristic frequency in described estimating,
The mark being automatically performed described in modification, forms complete section face actual characteristic Frequency Identification figure, specially：
For the complete section face acoustic signals spectrogram, resonance peak is searched near characteristic frequency in described estimating, obtained real
Characteristic frequency is simultaneously identified, and forms complete section face actual characteristic Frequency Identification figure.
8. the longitudinal profile Equivalent Pile footpath computational methods of pile detection sound wave transmission method are used for as claimed in claim 1 or 2, its
It is characterised by, according to the complete section face velocity of wave variation diagram and the complete section face actual characteristic Frequency Identification figure, calculates complete section face each
Measuring point Equivalent Pile footpath, specially：
D '=kc/2fm′
Wherein, D ' is the Equivalent Pile footpath of the position described to be measured asked for, and k is taken for correction factor, and k=1.0, c measurement are obtained
The real-time velocity of wave of the position to be measured, fm' it is the actual characteristic frequency values of the position to be measured.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611252244.4A CN106767583B (en) | 2016-12-30 | 2016-12-30 | Longitudinal profile Equivalent Pile diameter calculation method for pile detection sound wave transmission method |
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| CN201611252244.4A CN106767583B (en) | 2016-12-30 | 2016-12-30 | Longitudinal profile Equivalent Pile diameter calculation method for pile detection sound wave transmission method |
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| CN113295765A (en) * | 2021-05-14 | 2021-08-24 | 四川陆通检测科技有限公司 | Method for detecting grouting defect of pore |
| CN115266929A (en) * | 2022-08-09 | 2022-11-01 | 成都工业职业技术学院(成都市工业职业技术学校) | High-speed railway fundamental resonance early warning method and system based on deep learning |
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| CN115266929A (en) * | 2022-08-09 | 2022-11-01 | 成都工业职业技术学院(成都市工业职业技术学校) | High-speed railway fundamental resonance early warning method and system based on deep learning |
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