CN103424470B - The method of a kind of concrete filled steel tube bond state ultrasound examination - Google Patents
The method of a kind of concrete filled steel tube bond state ultrasound examination Download PDFInfo
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- CN103424470B CN103424470B CN201310341928.1A CN201310341928A CN103424470B CN 103424470 B CN103424470 B CN 103424470B CN 201310341928 A CN201310341928 A CN 201310341928A CN 103424470 B CN103424470 B CN 103424470B
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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
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/48—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by amplitude comparison
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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
- G01N2291/015—Attenuation, scattering
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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
- G01N2291/04—Wave modes and trajectories
- G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
Abstract
The invention discloses the method for a kind of concrete filled steel tube bond state ultrasound examination, comprise the following steps: (1), make the control sample with checked object same size: (2), detect control sample whether can use: (3), make sensitivity curve: (4), detect: the digital ultrasound detector using above-mentioned debugging good carries out bond state detection to tested concrete filled steel tube, both observations are the most high reverse--bias amplitude of interface echo and interface multiecho envelope diagram form repeatedly, if to reach the standard grade lower than sensitivity curve if the most high reverse--bias wave amplitude in interface rolls off the production line higher than sensitivity curve, then be judged to be imperfect bonding, if roll off the production line lower than equaling sensitivity curve, be judged to be that bonding is good, if be more than or equal to sensitivity curve to reach the standard grade, be judged to be complete delamination.The present invention can realize steel pipe and concrete binding state is on-the-spot fast, comprehensive, Non-Destructive Testing reliably, realizes evaluating fast and effectively the two bond state under the prerequisite not destroying concrete filled steel tube.
Description
Technical field
The present invention relates to the detection method of concrete filled steel tube bond state in a kind of grid power transmission engineering, particularly relate to the lossless detection method of a kind of concrete filled steel tube bond state ultrasound examination.
Background technology
Due to concrete filled steel tube have that bearing capacity is high, the advantage such as plasticity and good toughness, cost are low, easy construction, make it obtain engineer applied widely, as bridge, skyscraper and house etc.Thin-walled centrifugal concrete steel tube tower, as the one of concrete filled steel tube, is widely applied in grid power transmission engineering, and especially without the need to bracing wire, floor area is little, is widely used in city.Steel pipe and concrete, once peel off, because the engineering accident that concrete filled steel tube damages or inefficacy causes all may occur at any time, directly endanger the life security of national wealth and the people.
Whether well steel pipe and concrete binding, directly have influence on compressive strength and the compression deformation ability of concrete filled steel tube.Concrete steel pipe tower is in manufacture, transport, installation, use procedure, all likely produce steel pipe and concrete binding bad, the cohesive strength that result in the two declines greatly, thus have a strong impact on steel pipe and concrete plays a role jointly, greatly reduce the bearing capacity rigidity of concrete steel pipe tower, thus cause the accident of falling tower to occur.
At present, a type is mainly contained about the test method of concrete filled steel tube interface shearing-resistance cohesive strength both at home and abroad: push out test.Push out test is a kind of destructive test, specifically leaves one section of empty steel pipe in materialsed one end, and the other end places the billet that one piece of internal diameter is slightly less than steel pipe on the end face of core concrete.During test, test specimen one end is core concrete pressurized, and the other end is steel pipe pressurized, so just core concrete is released steel pipe, determines shearing resistance cohesive strength.But this kind of mode can not judge the bond state of concrete filled steel tube, push out test needs to prepare experimental sample tube, carries out destructive test, at substantial manpower, material resources and financial resources.Therefore, develop a kind of easy on-the-spot Dynamic Non-Destruction Measurement for steel pipe and concrete bond state and seem particularly important.
Summary of the invention
The object of this invention is to provide the method for a kind of concrete filled steel tube bond state ultrasound examination, detection speed be fast, accuracy of judgement, with low cost, can determine whether concrete filled steel tube bonds well.
The present invention adopts following technical proposals: the method for a kind of concrete filled steel tube bond state ultrasound examination, comprise the following steps: (1), in digital ultrasound detector, make sensitivity curve: meter sensitivity curve: sensitivity curve computing formula of reaching the standard grade is: y=a-20lgx
Y in formula: interface echo acoustic pressure, dB; A is reference value, dB; X is boundary reflection echo times; The sensitivity curve computing formula that rolls off the production line is: y=a-20lgx-20xlg|r|,
Y in formula: interface echo acoustic pressure, dB; A is reference value, dB; X is boundary reflection echo times, and r is Steel concrete interface pressure reflection ratio;
In digital ultrasound detector, the sensitivity curve of N interface echo is made according to above-mentioned sensitivity curve formula;
(2), carry out detecting judgement: the digital ultrasound detector using above-mentioned debugging good carries out bond state detection to tested concrete filled steel tube, detection probe is placed on steel pipe side, conditioning instrumentation makes to occur N interface echo in digital ultrasound detector screen, observe N interface echo form of tested concrete filled steel tube, to reach the standard grade lower than sensitivity curve if roll off the production line higher than sensitivity curve, be then judged to be imperfect bonding; If roll off the production line lower than equaling sensitivity curve, be judged to be that bonding is good; If be more than or equal to sensitivity curve to reach the standard grade, be judged to be complete delamination.
When detecting in described step (2) by detection probe by ultrasonic coupling agent and steel tube surface good contact, at the uniform velocity mobile probe; Probe translational speed is not more than 150mm/ second, and twice adjacent scanning probe overlapping region is not less than 10%.
Described digital ultrasound detector is general A type pulse-echo ultrasound wave inspection instrument, its operating frequency range is 0.5MHz ~ 10MHz, instrument at least linearly shows in full-scale 80% scope of video screen, horizontal linearity error is not more than 1%, vertical linearity error is not more than 5%, probe beam axis offset angle should not be greater than 2 °, Main beam vertical direction does not have significantly bimodal.
Described detection probe is high frequency monocrystalline compressional wave normal probe, and detection probe wafer size is Ф 14mm ~ 20mm, and frequency is 2 ~ 5MHz, and the far field resolving power of detection probe is not less than 30dB.
Described digital ultrasound detector has waveform recording function; Combination frequency and the nominal frequency error of instrument and probe be not more than ± and 10%.
The invention also discloses the method for another kind of concrete filled steel tube bond state ultrasound examination, comprise the following steps: (1), make and the control sample of checked object same size: described control sample adopts and checked object same thickness, steel pipe that material acoustical behavior is identical or close, adopt the concrete with checked object identical component, adopt and make the two bond together with checked object same process, make control sample have the region of two kinds of adhering states: the region of bonding good region and complete delamination;
(2), detect control sample whether can use: use digital ultrasound detector, detection probe is positioned over the steel pipe side of bonding good area, keeps good coupling with steel pipe; First time interface echo acoustic pressure wave amplitude is reached benchmark wave height by conditioning instrumentation gain knob, and measure diverse location interface echo sound pressure level in this region, test position is no less than 5 points, asks its mean value Δ
real, Δ=Δ
real-Δ
reason; If Δ < is 2dB, then represent steel pipe and concrete binding well, can as Sensitivity comparison test block; If Δ>=2dB, then return step (1) and again make control sample; Wherein Δ
reason=20lgr, r are Steel concrete interface pressure reflection ratio,
wherein Z
1for acoustic impedance in steel pipe, Z
2for acoustic impedance in concrete, P
rreflecting acoustic pressure, P
0it is incident sound pressure;
(3), sensitivity curve is made: survey interface echo with the steel pipe side of detection probe on the delaminated area of control sample, conditioning instrumentation makes to occur N interface echo in digital ultrasound detector screen, N >=9, each interface echo is made requirement according to distance gain size curve draw, reach the standard grade as sensitivity curve; Then with detection probe in the bonding good area of control sample steel pipe side survey interface echo, conditioning instrumentation makes to occur N interface echo in digital ultrasound detector screen, each interface echo is made requirement according to distance gain size curve draw, roll off the production line as sensitivity curve;
(4), carry out detecting judgement: the digital ultrasound detector using above-mentioned debugging good carries out bond state detection to tested concrete filled steel tube, detection probe is placed on steel pipe side, conditioning instrumentation makes to occur N interface echo (N>9) in digital ultrasound detector screen, observe N interface echo form of tested concrete filled steel tube, to reach the standard grade lower than sensitivity curve if roll off the production line higher than sensitivity curve, be then judged to be imperfect bonding; If roll off the production line lower than equaling sensitivity curve, be judged to be that bonding is good; If be more than or equal to sensitivity curve to reach the standard grade, be judged to be complete delamination.
When the theory calculate in described step (2) and control sample actual measurement, be calculating object by adjacent twice interface echo in sound path 100mm place.
The length of pipe section of described control sample is not less than 400mm.
When detecting in described step (4) by detection probe by ultrasonic coupling agent and steel tube surface good contact, at the uniform velocity mobile probe; Probe translational speed is not more than 150mm/ second, and twice adjacent scanning probe overlapping region is not less than 10%.
Described digital ultrasound detector is general A type pulse-echo ultrasound wave inspection instrument, has waveform recording function; Its operating frequency range is 0.5MHz ~ 10MHz, instrument at least linearly shows in full-scale 80% scope of video screen, horizontal linearity error is not more than 1%, vertical linearity error is not more than 5%, probe beam axis offset angle should not be greater than 2 °, Main beam vertical direction does not have significantly bimodal; Described detection probe is high frequency monocrystalline compressional wave normal probe, and detection probe wafer size is Ф 14mm ~ 20mm, and frequency is 2 ~ 5MHz, and the far field resolving power of detection probe is not less than 30dB; Combination frequency and the nominal frequency error of instrument and probe be not more than ± and 10%.
The present invention is a kind of methodology of based on digital ultrasound detector, steel pipe and concrete binding state being carried out to on-the-spot quick, reliable Non-Destructive Testing, it solve the relevant restriction of original detection method, by analyzing, calculating Steel concrete heterogeneous interface ultrasonic reflections characteristic, propose a kind of based on high frequency list probe lossless detection method, be applicable to the Steel concrete bond state complete detection of different tube diameters, different-thickness, be particularly useful for the steel-concrete structure such as electric force pole tower, building pillar.The present invention can realize steel pipe and concrete binding state is on-the-spot fast, comprehensive, Non-Destructive Testing reliably, and compare with existing push out test, advantage is as follows:
1. existing push out test is a kind of destructive test, and the present invention is a kind of lossless detection method, overcome the shortcoming that traditional detection method need destroy checked object, adopt Non-Destructive Testing mode to realize evaluating fast and effectively the two bond state under the prerequisite not destroying concrete filled steel tube, reduce manual detection intensity;
2. existing push out test can measure concrete filled steel tube interfacial adhesion-slippage overall process, and determines shearing resistance cohesive strength, but can not judge the bond state of concrete filled steel tube, and this motion method can determine whether concrete filled steel tube bonds well.
3. existing push out test needs to prepare experimental sample tube and carries out destructive test, at substantial manpower, material resources and financial resources, and this motion method detection speed is fast, and accuracy of judgement is with low cost, saves man power and material;
4. the present invention adopts a kind of based on high frequency list Probe Ultrasonic Searching wave detecting method, and by coupling general digital supersonic reflectoscope, whole detection system is simple, convenient carries; The frequency that detection probe adopts is 2 ~ 5MHz, and wafer size is Ф 14mm ~ 20mm compressional wave normal probe;
5. check control sample steel pipe and concrete binding state by theory calculate, demarcate detection sensitivity with control sample, highly sensitive;
6. adopt interface echo amplitude, repeatedly interface echo envelope diagram to judge steel pipe and concrete binding state, visual result, reliably.
Accompanying drawing explanation
Fig. 1 is method flow diagram of the present invention;
Fig. 2 is the sensitivity curve figure of interface echo acoustic pressure of the present invention;
Fig. 3 is the sensitivity curve figure of interface echo height of the present invention.
Embodiment
As shown in Figure 1, the invention discloses the method for a kind of concrete filled steel tube bond state ultrasound examination,
(1), make and the control sample of checked object same size: described control sample adopts and checked object same thickness, steel pipe that material acoustical behavior is identical or close, adopt the concrete with checked object identical component, adopt and make the two bond together with checked object same process, make control sample have the region of two kinds of adhering states: the region of bonding good region and complete delamination;
(2), detect control sample whether can use: use digital ultrasound detector, detection probe is positioned over the steel pipe side of bonding good area, keeps good coupling with steel pipe; First time interface echo acoustic pressure wave amplitude is reached benchmark wave height by conditioning instrumentation gain knob, and measure diverse location interface echo sound pressure level in this region, test position is no less than 5 points, asks its mean value Δ
real, Δ=Δ
real-Δ
reason; If Δ < is 2dB, then represent steel pipe and concrete binding well, can as Sensitivity comparison test block; If Δ>=2dB, then return step (1) and again make control sample; Wherein Δ
reason=20lgr,
R is Steel concrete interface pressure reflection ratio,
wherein Z
1for acoustic impedance in steel pipe, Z
2for acoustic impedance in concrete, P
rreflecting acoustic pressure, P
0it is incident sound pressure;
Herein when theory calculate and control sample actual measurement, be calculating object by adjacent twice interface echo in sound path 100mm place.
(3), sensitivity curve is made: survey interface echo with the steel pipe side of detection probe on the delaminated area of control sample, conditioning instrumentation makes to occur N interface echo (N >=9) in digital ultrasound detector screen, each interface echo is made requirement according to distance gain size curve draw, reach the standard grade as sensitivity curve; Then with detection probe in the bonding good area of control sample steel pipe side survey interface echo, conditioning instrumentation makes to occur N interface echo in digital ultrasound detector screen, each interface echo is made requirement according to distance gain size curve draw, roll off the production line as sensitivity curve, namely curve is as shown in Figure 3 the curve drawn out;
(4), detect: use above-mentioned digital ultrasound detector to carry out bond state detection to tested concrete filled steel tube, detection probe is placed on steel pipe side, conditioning instrumentation makes to occur N interface echo in digital ultrasound detector screen, observe N interface echo form of tested concrete filled steel tube, to reach the standard grade lower than sensitivity curve if roll off the production line higher than sensitivity curve, be then judged to be imperfect bonding; If roll off the production line lower than equaling sensitivity curve, be judged to be that bonding is good; If be more than or equal to sensitivity curve to reach the standard grade, be judged to be complete delamination.
When detecting in described step (4), probe is placed in checked object steel pipe side surface, detection probe is by ultrasonic coupling agent and steel tube surface good contact, at the uniform velocity mobile probe; Probe translational speed is not more than 150mm/ second, and twice adjacent scanning probe overlapping region is not less than 10%.
The invention also discloses the method for another concrete filled steel tube bond state ultrasound examination, specific as follows: to comprise the following steps: (1), making sensitivity curve: meter sensitivity curve:
Sensitivity curve computing formula of reaching the standard grade is: y=a-20lgx,
Y in formula: interface echo acoustic pressure, dB; A is reference value, dB; X is boundary reflection echo times; The sensitivity curve computing formula that rolls off the production line is: y=a-20lgx-20xlg|r|,
Y in formula: interface echo acoustic pressure, dB; A is reference value, dB; X is boundary reflection echo times, and r is Steel concrete interface pressure reflection ratio;
In digital ultrasound detector, the sensitivity curve of N interface echo is made according to above-mentioned sensitivity curve formula;
The definition of reference value a: first mapped point of distance gain size curve is as reference point, and the instrument gain button reading corresponding to it is called reference value, unit dB;
Probe can be placed in delamination position, obtain repeatedly steel pipe walls Bottom echo, sound path is more than or equal to position, 3 times of near field regions Bottom echo and is adjusted to 90% of screen, this echo is reference point, read now instrument gain numerical value as reference value.
(2), carry out detecting judgement: the digital ultrasound detector using above-mentioned debugging good carries out bond state detection to tested concrete filled steel tube, detection probe is placed on steel pipe side, conditioning instrumentation makes to occur N interface echo in digital ultrasound detector screen, observe N interface echo form of tested concrete filled steel tube, to reach the standard grade lower than sensitivity curve if roll off the production line higher than sensitivity curve, be then judged to be imperfect bonding; If roll off the production line lower than equaling sensitivity curve, be judged to be that bonding is good; If be more than or equal to sensitivity curve to reach the standard grade, be judged to be complete delamination.
Below Cleaning Principle of the present invention is described in detail: digital ultrasound detector used in the present invention is general A type pulse-echo ultrasound wave inspection instrument, its operating frequency range is 0.5MHz ~ 10MHz, instrument at least linearly shows in full-scale 80% scope of video screen, horizontal linearity error is not more than 1%, vertical linearity error is not more than 5%, probe beam axis offset angle should not be greater than 2 °, Main beam vertical direction does not have significantly bimodal; Digital ultrasound detector has waveform recording function; Combination frequency and the nominal frequency error of instrument and probe be not more than ± and 10%; Described probe is high frequency monocrystalline compressional wave normal probe, and probe wafer size is Ф 14mm ~ 20mm, and frequency is 2 ~ 5MHz, and the far field resolving power of probe is not less than 30dB.The length of pipe section of described control sample is not less than 400mm.
Concrete steel pipe tower outer wall steel are generally Q235 structural steel, and Q235 steel has isotropy, and the velocity of sound is about 5900m/s, and density is 7800kg/m
3; Normal concrete is the potpourri of cement and sandstone, and apparent density is 1950 ~ 2500kg/m
3, be concrete species the most frequently used in civil engineering work, the velocity of sound is about 4120m/s.Be density according to formula Z=ρ c(ρ, c is the velocity of sound) known steel pipe and concrete have diverse acoustic impedance Z (characterizing the important physical amount of medium acoustic characteristic).
When ultrasound wave is from a kind of Medium Propagation to another kind of medium, on the interphase of two media, part energy is reflected back in former medium, claims reflection wave; Another part energy is propagated in another kind of medium through interface, claims transmitted wave.Produce the characteristic of reflection, transmission according to ultrasound wave at heterogeneous interface, therefore adopt ultrasonic detection method to evaluate the bond state of steel pipe and concrete interface.
If the two bond state is good, when namely ultrasound wave impinges perpendicularly on steel pipe and concrete binding interface, acoustic impedance Z in steel
1=4.50 × 10
6g/cm
2s, acoustic impedance Z in concrete
2=1.07 × 10
6g/cm
2s, then ultrasound wave at pressure reflection ratio r, the transmissivity t of steel/concrete interface is:
If steel pipe and concrete produce delamination, have air and enter in the middle of the two, when adopting ultrasound wave incident from external vertical, interface at this moment becomes steel/Air Interface.Acoustic impedance Z in steel
1=4.50 × 10
6g/cm
2s, the acoustic impedance Z of air
2=4 × 10
-5g/cm
2s, then ultrasound wave is at pressure reflection ratio r, the transmissivity t of steel/Air Interface:
Can find out according to above-mentioned result of calculation, steel pipe and concrete bonding state good time, the pressure reflection ratio at interface is 61%; When there is delamination, pressure reflection ratio is 100%.When bond state changes, interface also changes hyperacoustic pressure reflection ratio thereupon, therefore adopts special ultrasonic detection instrument, judges steel pipe and concrete binding state by the conversion measuring pressure reflection ratio.
When detecting sound path and being more than or equal to three times of near field regions, the reflection of ultrasound wave on the large planar base surface of, any surface finish vertical with beam axis is exactly spherical wave reflection in the plane, its echo acoustic pressure P
bb is:
(P
0: incident sound pressure, F
s: sound source area, λ: wavelength, x: detect sound path) (formula 1.5)
The N time interface echo decibel difference (N echo) during different bonding state:
Pressure reflection ratio r in interface during delamination state known according to formula 1.1-1.3
1=-1, in conjunction with pressure reflection ratio r in interface during kilter
2=-0.616, substitute into formula 1.6 and calculate the two decibel difference (table 1):
Table 1 delaminated area with in conjunction with good area the N time interface echo decibel difference (dB)
Setting interface echo acoustic pressure (dB) is y, and interface echo number of times is x, and the above-mentioned data of matching and formula can obtain the graph of relation sum functions relational expression of interface echo decibel value and interface echo number of times: y=f(x).
Matched curve figure is shown in Fig. 2, and functional relation is as follows:
Sensitivity curve computing formula of reaching the standard grade is: y=a-20lgx
Y in formula: interface echo acoustic pressure, dB; A is reference value, dB; X is boundary reflection echo times;
The sensitivity curve computing formula that rolls off the production line is: y=a-20lgx-20xlg|r|
Y in formula: interface echo acoustic pressure, dB; A is reference value, dB; X is boundary reflection echo times, and r is Steel concrete interface pressure reflection ratio.
Fast simple measurement can be carried out to steel pipe and concrete bond state (good, bad, delamination) according to this functional relation.To be directly proportional to decibel value by wave amplitude height and can to obtain Fig. 3 interface ultrasonic echo envelope diagram panel curve.Sensitivity in Fig. 3 is reached the standard grade: lgH=a-20lgx rolls off the production line: lgH=a-20lgx-20xlg|r|.
Interface echo envelope diagram can be drawn fast on instrument according to above-mentioned data, detect echo present position, median surface according to reality, can judge rapidly that whether Steel concrete bond state is good.
Claims (10)
1. a method for concrete filled steel tube bond state ultrasound examination, is characterized in that: comprise the following steps: (1), in digital ultrasound detector, make sensitivity curve: meter sensitivity curve:
Sensitivity curve computing formula of reaching the standard grade is: y=a-20lgx,
Y in formula: interface echo acoustic pressure, dB; A is reference value, dB; X is boundary reflection echo times; The sensitivity curve computing formula that rolls off the production line is: y=a-20lgx-20xlg|r|,
Y in formula: interface echo acoustic pressure, dB; A is reference value, dB; X is boundary reflection echo times, and r is Steel concrete interface pressure reflection ratio;
The definition of reference value a: first mapped point of distance gain size curve is as reference point, and the instrument gain button reading corresponding to it is called reference value, unit dB;
Probe is placed in delamination position, obtains repeatedly steel pipe walls Bottom echo, sound path is more than or equal to position, 3 times of near field regions Bottom echo and is adjusted to 90% of screen, this echo is reference point, read now instrument gain numerical value as reference value;
In digital ultrasound detector, the sensitivity curve of N interface echo is made according to above-mentioned sensitivity curve formula;
(2), carry out detecting judgement: the digital ultrasound detector using above-mentioned debugging good carries out bond state detection to tested concrete filled steel tube, detection probe is placed on steel pipe side, conditioning instrumentation makes to occur N interface echo in digital ultrasound detector screen, observe N interface echo form of tested concrete filled steel tube, to reach the standard grade lower than sensitivity curve if roll off the production line higher than sensitivity curve, be then judged to be imperfect bonding; If roll off the production line lower than equaling sensitivity curve, be judged to be that bonding is good; If be more than or equal to sensitivity curve to reach the standard grade, be judged to be complete delamination.
2. the method for concrete filled steel tube bond state according to claim 1 ultrasound examination, is characterized in that: when detecting in described step (2) by detection probe by ultrasonic coupling agent and steel tube surface good contact, at the uniform velocity mobile probe; Probe translational speed is not more than 150mm/ second, and twice adjacent scanning probe overlapping region is not less than 10%.
3. the method for concrete filled steel tube bond state according to claim 1 ultrasound examination, it is characterized in that: described digital ultrasound detector is general A type pulse-echo ultrasound wave inspection instrument, its operating frequency range is 0.5MHz ~ 10MHz, instrument at least linearly shows in full-scale 80% scope of video screen, horizontal linearity error is not more than 1%, vertical linearity error is not more than 5%, probe beam axis offset angle should not be greater than 2 °, Main beam vertical direction does not have significantly bimodal.
4. the method for concrete filled steel tube bond state according to claim 1 ultrasound examination, it is characterized in that: described detection probe is high frequency monocrystalline compressional wave normal probe, detection probe wafer size is Ф 14mm ~ 20mm, frequency is 2 ~ 5MHz, and the far field resolving power of detection probe is not less than 30dB.
5. the method for concrete filled steel tube bond state according to claim 1 ultrasound examination, is characterized in that: described digital ultrasound detector has waveform recording function; Combination frequency and the nominal frequency error of instrument and probe be not more than ± and 10%.
6. the method for concrete filled steel tube bond state ultrasound examination, it is characterized in that: comprise the following steps: (1), make and the control sample of checked object same size: described control sample adopts and checked object same thickness, steel pipe that material acoustical behavior is identical or close, adopt the concrete with checked object identical component, adopt and make the two bond together with checked object same process, make control sample have the region of two kinds of adhering states: the region of bonding good region and complete delamination;
(2), detect control sample whether can use: use digital ultrasound detector, detection probe is positioned over the steel pipe side of bonding good area, keeps good coupling with steel pipe; First time interface echo acoustic pressure wave amplitude is reached benchmark wave height by conditioning instrumentation gain knob, and measure diverse location interface echo sound pressure level in this region, test position is no less than 5 points, asks its mean value △
real, △=△
real-△
reason; If △ < is 2dB, then represent steel pipe and concrete binding well, can as Sensitivity comparison test block; If △>=2dB, then return step (1) and again make control sample; Wherein △
reason=20lgr, r are Steel concrete interface pressure reflection ratio,
wherein Z
1for acoustic impedance in steel pipe, Z
2for acoustic impedance in concrete, P
rreflecting acoustic pressure, P
0it is incident sound pressure;
(3), sensitivity curve is made: survey interface echo with the steel pipe side of detection probe on the delaminated area of control sample, conditioning instrumentation makes to occur N interface echo in digital ultrasound detector screen, N >=9, each interface echo is made requirement according to distance gain size curve draw, reach the standard grade as sensitivity curve; Then with detection probe in the bonding good area of control sample steel pipe side survey interface echo, conditioning instrumentation makes to occur N interface echo in digital ultrasound detector screen, each interface echo is made requirement according to distance gain size curve draw, roll off the production line as sensitivity curve;
(4), carry out detecting judgement: the digital ultrasound detector using above-mentioned debugging good carries out bond state detection to tested concrete filled steel tube, detection probe is placed on steel pipe side, conditioning instrumentation makes to occur N interface echo (N>9) in digital ultrasound detector screen, observe N interface echo form of tested concrete filled steel tube, to reach the standard grade lower than sensitivity curve if roll off the production line higher than sensitivity curve, be then judged to be imperfect bonding; If roll off the production line lower than equaling sensitivity curve, be judged to be that bonding is good; If be more than or equal to sensitivity curve to reach the standard grade, be judged to be complete delamination.
7. the method for concrete filled steel tube bond state according to claim 6 ultrasound examination, it is characterized in that: when the theory calculate in described step (2) and control sample actual measurement, be calculating object by adjacent twice interface echo in sound path 100mm place.
8. the method for concrete filled steel tube bond state according to claim 6 ultrasound examination, is characterized in that: the length of pipe section of described control sample is not less than 400mm.
9. the method for concrete filled steel tube bond state according to claim 6 ultrasound examination, is characterized in that: when detecting in described step (4) by detection probe by ultrasonic coupling agent and steel tube surface good contact, at the uniform velocity mobile probe; Probe translational speed is not more than 150mm/ second, and twice adjacent scanning probe overlapping region is not less than 10%.
10. the method for concrete filled steel tube bond state according to claim 6 ultrasound examination, is characterized in that: described digital ultrasound detector is general A type pulse-echo ultrasound wave inspection instrument, has waveform recording function; Its operating frequency range is 0.5MHz ~ 10MHz, instrument at least linearly shows in full-scale 80% scope of video screen, horizontal linearity error is not more than 1%, vertical linearity error is not more than 5%, probe beam axis offset angle should not be greater than 2 °, Main beam vertical direction does not have significantly bimodal; Described detection probe is high frequency monocrystalline compressional wave normal probe, and detection probe wafer size is Ф 14mm ~ 20mm, and frequency is 2 ~ 5MHz, and the far field resolving power of detection probe is not less than 30dB; Combination frequency and the nominal frequency error of instrument and probe be not more than ± and 10%.
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| PCT/CN2013/083555 WO2015018116A1 (en) | 2013-08-07 | 2013-09-16 | Method for ultrasonic detection of bonding state of steel pipe and concrete |
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| CN108872380A (en) * | 2018-06-04 | 2018-11-23 | 航天特种材料及工艺技术研究所 | The bonding defect detecting method of multi-layer bonded component |
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