CN107167521A - A kind of detection method for improving identification concrete defect and lesion capability - Google Patents
A kind of detection method for improving identification concrete defect and lesion capability Download PDFInfo
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- CN107167521A CN107167521A CN201710523642.3A CN201710523642A CN107167521A CN 107167521 A CN107167521 A CN 107167521A CN 201710523642 A CN201710523642 A CN 201710523642A CN 107167521 A CN107167521 A CN 107167521A
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Abstract
The invention discloses a kind of detection method for improving identification concrete defect and lesion capability, comprise the following steps：(a) two waveforms are received the surface that sensor is separately mounted to concrete structure to be measured, measures the spacing between two waveforms reception sensors；(b) waveform receives the side progress exciting of sensor wherein, and two waveforms of collection receive the test data of sensor, obtain two groups of wavy curves；(c) by two groups of wavy curves correlation to cross-correlation functions, take first peak point in two groups of wavy curves to bring into the cross-correlation function respectively, obtain the time difference between peak point in two groups of wavy curves；(d) passage time difference calculates elastic wave and receives the velocity of wave that sensor receives sensor to another waveform from a waveform；(e) velocity of wave calculated is compared with standard velocity of wave, judges defect and degree of impairment.
Description
Technical field
The present invention relates to concrete NDT field, and in particular to a kind of inspection of raising identification concrete defect and lesion capability
Survey method.
Background technology
Concrete structure is most important building, building structure, but it is artificial that some are there may be in work progress
Use inferior materials and turn out substandard goods or engineering defect, in order to ensure pouring quality and its internal soundness of inspection, do not destroying detected concrete structure
Under the premise of physical state, chemical property originally etc., Non-Destructive Testing without suspected of the best approach, such as ultrasonic examination method, rebound method,
Shock wave resilience synthesis etc..Concrete nondestructive testing is concrete non-damaged data, is not exactly destroying component original to be measured
Under the premise of state, chemical property come etc., the physical quantity related by obtaining concrete, reinforcing bar etc., and make full use of acquired
Physical quantity using the methods such as correlation curve fitting data processing, presumption defect in concrete and degree of impairment.
At present, the technology of concrete structure Inner Defect Testing has been continued to develop using impact elasticity ripple.Its principle
It is different and internal structure is judged and detected using spread speed of the elastic wave in different medium.Such detection method
According to the difference of sensor mounting location, one side bounce technique, surface wave method and two-sided penetrant method etc., one side reflection have been divided into it
Method is mainly for the defect and fault localization of shallow-layer concrete structure, and surface wave method and two-sided transmission rule are mainly for large-scale mixed
The inside detection of Xtah Crude Clay structure.
Existing detection method is the direct Mintrop wave for obtaining two original waveforms, calculate the distance between two Mintrop waves,
Initial time when two sensors are respectively received Mintrop wave is poor, and judges actual velocity of wave on this basis, again by reality
Velocity of wave is compared judgement.However, carrying out defect in concrete and damage check using surface wave method and two-sided penetrant method
When, elastic wave is propagated in inside concrete, will necessarily be perfected position by inside concrete reinforcing bar, concrete and be disturbed, elasticity
Ripple is considerably more rapid in the spread speed that reinforcing bar, concrete perfect position, therefore in the prior art using impact elasticity ripple to defect
All the time there is larger error in the mode detected with damage.
The content of the invention
It is an object of the invention to provide a kind of detection method for improving identification concrete defect and lesion capability, to solve
, precision big to defect in concrete and damage progress inspection time determination error is low by way of impact elasticity ripple in the prior art
Problem, realizes reduction detection error, improves defect, the purpose of the recognition capability of damage to inside concrete.
The present invention is achieved through the following technical solutions：
A kind of detection method for improving identification concrete defect and lesion capability, comprises the following steps：
(a) two waveforms are received the surface that sensor is separately mounted to concrete structure to be measured, measures two waveforms and connect
Receive the spacing between sensor；
(b) waveform receives the side progress exciting of sensor wherein, and two waveforms of collection receive the survey of sensor
Data are tried, two groups of wavy curves are obtained；
(c) by two groups of wavy curves correlation to cross-correlation functions, first peak in two groups of wavy curves is taken respectively
Value point is brought into the cross-correlation function, obtains the time difference between peak point in two groups of wavy curves；
(d) passage time difference calculates elastic wave and receives sensor to another waveform reception sensor from a waveform
Velocity of wave；
(e) velocity of wave calculated is compared with standard velocity of wave, judges defect and degree of impairment.
For carrying out detection mistiming to defect in concrete and damage by way of impact elasticity ripple in the prior art
The problem of difference is big, precision is low, the present invention proposes a kind of detection method for improving and recognizing concrete defect and lesion capability.Existing skill
Detection mode in art, is the direct Mintrop wave initial position for obtaining two original waveforms, measure between two sensors away from
Initial time when Mintrop wave is respectively received from, two sensors is poor, and judges actual velocity of wave on this basis, again by reality
Border velocity of wave is compared judgement.But inventor is having found after numerous studies, the reinforcing bar of inside concrete and perfects portion
Position all has very big interference to the detection of Mintrop wave, specifically：(1) elastic wave is propagated along inside concrete structure, when
When the direction of propagation of partial elastic ripple and propagation path are overlapped with the trend of inside concrete reinforcing bar, elastic wave will be entered along reinforcing bar
Go and propagate, and spread speed of the elastic wave in reinforcing bar is fast compared to the spread speed in concrete, so partly along reinforcing bar
The elastic wave signal of propagation will arrive reception end sensor in advance than the signal in concrete, although the signal is more faint,
It can still be distorted, so as to cause interference with the selection of initial time；(2) elastic wave run on propagation path concrete defect or
Damage, it will be divided into two parts of signals, a part of signal is directly to reach reception sensor, another portion by defect damage region
Sub-signal is to bypass defect damage region and reaches reception sensor by perfecting position, but passes through the elasticity in defect damage region
Its velocity of wave of ripple will necessarily be reduced, so will reach receiving terminal prior to the signal through defect, damage by the signal for perfecting position
Sensor, therefore, using the signal reached at first, can bring about interference, reduces the recognition capability to defect and damage.The present invention
The detection method proposed, precisely in order to overcoming what above mentioned problem was proposed.Two waveforms sensor is received first respectively to pacify
Mounted in the surface of concrete structure to be measured, and the spacing measured between two waveforms reception sensors is standby.Afterwards wherein one
The side that individual waveform receives sensor carries out exciting, and two waveforms of collection receive the test data of sensor, obtain two groups of waveforms
Curve.The waveform nearer apart from Position of Vibrating receives sensor and can be immediately subjected to elastic wave signal and be recorded, elastic wave
Signal is received by the transmission of concrete structure, again by another waveform reception sensor.The biography nearer apart from Position of Vibrating
Sensor is almost the vibration signal of concrete, and is then by concrete defect apart from the signal that the sensor of Position of Vibrating farther out receives
Fall into a variety of mixed signals composition that position signal, reinforcing bar influence signal, inside concrete perfect position etc..Afterwards by two groups of waveforms
In curvilinear correlation a to cross-correlation function, take first peak point in two groups of wavy curves to bring into the function respectively, obtain
Time difference in two groups of wavy curves between peak point.It is that two signal values are subjected to correlation, there is shown two groups of wavy curves
Degree of correlation between at any time, cross-correlation function is relative value, therefore by by first peak in two groups of wavy curves
Value point is brought into the time difference calculated in the function, that is, has reacted the main wave band of elastic wave in concrete structure internal communication
Velocity of wave is mixed, spacing divided by time difference between sensor is received with two waveforms, i.e., can calculate elastic wave from one
Waveform receives sensor to the velocity of wave of another waveform reception sensor, the velocity of wave considers reinforcing bar position, perfect position and
Internal flaw or the joint effect of damage, and due to being the cross-correlation carried out with the wavy curve beside impacting point, therefore gram
Having taken the elastic wave initial position obtained in existing detection mode is by reinforcing bar and perfects problem obtained by the acceleration at position.
The velocity of wave calculated is compared with standard velocity of wave, defect and degree of impairment is judged, the velocity of wave calculated is closer to mark
Quasi wave speed, then the defect inside surface concrete and damage less, structure it is more complete.Simply obtained compared in conventional method
Two elastic wave initial positions carry out the mode of velocity of wave calculating, and the present invention is by setting up cross-correlation function and being total to by peak
With actual velocity of wave is calculated, overcoming the elastic wave initial position obtained in existing detection mode is by reinforcing bar and perfects portion
Problem obtained by the acceleration of position, is solved in the prior art by way of impact elasticity ripple to defect in concrete and damage
The problem of inspection time determination error is big, precision is low is carried out, reduction detection error is realized, the defect to inside concrete is improved, damages
Recognition capability purpose.
The cross-correlation function of two groups of wavy curves is in step (c)：
In formula, X (t), Y (t) are respectively that the waveform at exciting receives sensor, passed away from the waveform reception at exciting
The wavy curve that sensor is obtained, T is observing time, and τ is the time difference.
Be that the signal that two waveforms are received into sensors regards X (t), Y (t) as respectively, for X (t) t value with
Correlations of the Y (t) between the value at t+ τ moment, product that can be to the two values on observing time makees average calculating operation, and takes it
The limit, so as to obtain the cross-correlation function in this programme, i.e., can overcome the elastic wave obtained in existing detection mode initial
Position is by reinforcing bar and perfects defect obtained by the acceleration at position, largely improves the accuracy of tried to achieve velocity of wave.
It is preferred that, the standard velocity of wave with the demarcation of the concrete test block of concrete structure equality strength to be measured by obtaining.With
Ensure as judgment criteria standard velocity of wave accurately and reliably, preferably both leave the examination of the batch concrete during construction in advance every time
Sample, so as to obtain accurate standard velocity of wave, it is to avoid obtain the detection that standard velocity of wave is brought frequently by experience in conventional art
Precision is uncertain.
It is preferred that, the waveform receives sensor and is attached with noiselike signal cable and outside.To improve the present invention
The performance such as counter-bending, vibration, impact, temperature change, with the wider scope of application.
It is preferred that, exciting is tapped using manpower in step (b).It is easy to accurately control beating position, it is ensured that Position of Vibrating position
The side of sensor is received in one of waveform.
It is preferred that, exciting is tapped using machinery in step (b).Ensure to be accurately controlled exciting dynamics, it is ensured that the bullet of generation
Property ripple is in tolerance interval.
It is preferred that, two waveforms receive sensor and are separately mounted to two relative surfaces of concrete structure to be measured.Two
Waveform receives the structure that sensor constitutes two-sided penetrant method detection, and concrete structure inside is integrally detected.
It is preferred that, two waveforms receive sensor and are arranged on the same surface of concrete structure to be measured.Suitable for thickness
The larger concrete structure in the smaller surface of degree is detected.
It is preferred that, it is acceleration transducer that the waveform, which receives sensor,.
It is preferred that, impacting point receives the distance between sensor≤10cm with one of waveform.To ensure apart from exciting
The nearer waveform in position receives sensor and can be immediately subjected to elastic wave signal and be recorded, while ensuring its letter recorded
Number be concrete vibration signal.
The present invention compared with prior art, has the following advantages and advantages：
A kind of detection method for improving identification concrete defect and lesion capability of the present invention is simple compared in conventional method
Two elastic wave initial positions of acquisition carry out the mode of velocity of wave calculating, the present invention is by setting up cross-correlation function and by peak value
Position calculates actual velocity of wave jointly, overcome the elastic wave initial position obtained in existing detection mode be by reinforcing bar and
Perfect problem obtained by the acceleration at position, solve in the prior art by way of impact elasticity ripple to defect in concrete
The problem of inspection time determination error is big, precision is low is carried out with damage, reduction detection error is realized, raising lacks to inside concrete
The purpose for the recognition capability fall into, damaged.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is the schematic flow sheet of the specific embodiment of the invention 1.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment and its explanation of the invention is only used for explaining the present invention, does not make
For limitation of the invention.
Embodiment 1：
A kind of raising identification concrete defect as shown in Figure 1 and the detection method of lesion capability, comprise the following steps：
(a) two waveforms are received sensor to be separately mounted on the same surface of concrete structure to be measured, measures two
Waveform receives the spacing between sensor；
(b) waveform receives the side progress manpower exciting of sensor wherein, and two waveforms of collection receive sensors
Test data, obtain two groups of wavy curves；
(c) by two groups of wavy curves correlation to cross-correlation functions, first peak in two groups of wavy curves is taken respectively
Value point is brought into the cross-correlation function, obtains the time difference between peak point in two groups of wavy curves；
(d) passage time difference calculates elastic wave and receives sensor to another waveform reception sensor from a waveform
Velocity of wave；
(e) velocity of wave calculated is compared with standard velocity of wave, judges defect and degree of impairment.
The present invention carries out two groups of signal values related, there is shown two groups of wavy curves at any time between related journey
Degree, cross-correlation function is relative value, therefore is calculated by the way that first peak point in two groups of wavy curves is brought into the function
The time difference gone out, that is, mixing velocity of wave of the main wave band of elastic wave in concrete structure internal communication is reacted, has been connect with two waveforms
Receive the spacing between sensor divided by the time difference, i.e., can calculate elastic wave from waveform reception sensor to another
Waveform receives the velocity of wave of sensor, and the velocity of wave considers reinforcing bar position, perfects position and internal flaw or the common shadow of damage
Ring, and due to being the cross-correlation carried out with the wavy curve beside impacting point, therefore overcome in existing detection mode and obtain
The elastic wave initial position taken is by reinforcing bar and perfects problem obtained by the acceleration at position.By the velocity of wave calculated and standard ripple
Speed is compared, and judges defect and degree of impairment, and the velocity of wave calculated is closer to standard velocity of wave, then inside surface concrete
Defect and damage less, structure it is more complete.It is simple compared in conventional method to obtain two elastic wave initial positions progress
The mode that velocity of wave is calculated, the present invention is overcome by setting up cross-correlation function and calculating actual velocity of wave jointly by peak
The elastic wave initial position obtained in existing detection mode is by reinforcing bar and perfects problem obtained by the acceleration at position, is solved
Carry out that inspection time determination error is big, precision is low by way of the impact elasticity ripple to defect in concrete and damage in the prior art
The problem of, reduction detection error is realized, defect, the purpose of the recognition capability of damage to inside concrete is improved.
Embodiment 2：
A kind of detection method for improving identification concrete defect and lesion capability, the cross-correlation function of two groups of wavy curves
For：
In formula, X (t), Y (t) are respectively that the waveform at exciting receives sensor, passed away from the waveform reception at exciting
The wavy curve that sensor is obtained, T is observing time, and τ is the time difference.The standard velocity of wave is by equal with concrete structure to be measured
The concrete test block demarcation of intensity is obtained.The waveform receives sensor and is attached with noiselike signal cable and outside.Step
Suddenly exciting is tapped using machinery in (b).Two waveforms receive sensor and are separately mounted to relative two of concrete structure to be measured
Surface.It is acceleration transducer that the waveform, which receives sensor,.Impacting point and one of waveform receive between sensor away from
From for 10cm.Between test object is between the concrete beam plate of the C50 intensity of existing defects, two sensors in the present embodiment
Away from for 17.3m, pair velocity of wave demarcation is carried out with testing the concrete test block of beam slab equality strength, its concrete velocity of wave is 4.1Km/s.
The mode for taking the Mintrop wave initial position of two original waveforms of traditional direct acquisition to be detected, testing result is that velocity of wave is
4.031Km/s, modulus is 28.17Gp, therefore, by being believed that the concrete beam plate and standard ripple after traditional technique in measuring
Speed is close, it can be determined that the beam slab is substantially closely knit.But, drawn after being detected with the method in the application, velocity of wave is
3.879Km/s, modulus is 26.09Gp.This is a cancellation reinforcing bar and perfects after influence of the position concrete to waveform starting point, passes through
The true Elastic Wave Velocity that concrete defect and damage field are propagated, the velocity of wave perfects position velocity of wave compared to concrete and substantially dropped
It is low, clearly reflect the beam slab existing defects.It is therefore apparent that, the present invention is compared to conventional art, with reduction inspection
Error is surveyed, defect, the effect of the recognition capability of damage to inside concrete is improved.
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. all should be included
Within protection scope of the present invention.
Claims (10)
1. a kind of detection method for improving identification concrete defect and lesion capability, it is characterised in that comprise the following steps：
(a) two waveforms are received the surface that sensor is separately mounted to concrete structure to be measured, measures two waveforms and receive biography
Spacing between sensor；
(b) waveform receives the side progress exciting of sensor wherein, and two waveforms of collection receive the test number of sensor
According to obtaining two groups of wavy curves；
(c) by two groups of wavy curves correlation to cross-correlation functions, first peak point in two groups of wavy curves is taken respectively
Bring into the cross-correlation function, obtain the time difference between peak point in two groups of wavy curves；
(d) passage time difference calculates elastic wave and receives the ripple that sensor receives sensor to another waveform from a waveform
Speed；
(e) velocity of wave calculated is compared with standard velocity of wave, judges defect and degree of impairment.
2. a kind of detection method for improving identification concrete defect and lesion capability according to claim 1, its feature exists
In the cross-correlation function of two groups of wavy curves is in step (c)：
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In formula, X (t), Y (t) are respectively that the waveform at exciting receives sensor, receives sensor away from the waveform at exciting
The wavy curve obtained, T is observing time, and τ is the time difference.
3. a kind of detection method for improving identification concrete defect and lesion capability according to claim 1, its feature exists
In the standard velocity of wave with the demarcation of the concrete test block of concrete structure equality strength to be measured by obtaining.
4. a kind of detection method for improving identification concrete defect and lesion capability according to claim 1, its feature exists
In the waveform receives sensor and is attached with noiselike signal cable and outside.
5. a kind of detection method for improving identification concrete defect and lesion capability according to claim 1, its feature exists
In exciting is tapped using manpower in step (b).
6. a kind of detection method for improving identification concrete defect and lesion capability according to claim 1, its feature exists
In exciting is tapped using machinery in step (b).
7. a kind of detection method for improving identification concrete defect and lesion capability according to claim 1, its feature exists
In two waveforms receive sensor and are separately mounted to two relative surfaces of concrete structure to be measured.
8. a kind of detection method for improving identification concrete defect and lesion capability according to claim 1, its feature exists
In two waveforms receive sensor and are arranged on the same surface of concrete structure to be measured.
9. a kind of detection method for improving identification concrete defect and lesion capability according to claim 1, its feature exists
In it is acceleration transducer that the waveform, which receives sensor,.
10. a kind of detection method for improving identification concrete defect and lesion capability according to claim 1, its feature exists
In impacting point receives the distance between sensor≤10cm with one of waveform.
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