CN103424470A - Method for ultrasonically detecting bonding state of steel pipes and concrete - Google Patents

Method for ultrasonically detecting bonding state of steel pipes and concrete Download PDF

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CN103424470A
CN103424470A CN2013103419281A CN201310341928A CN103424470A CN 103424470 A CN103424470 A CN 103424470A CN 2013103419281 A CN2013103419281 A CN 2013103419281A CN 201310341928 A CN201310341928 A CN 201310341928A CN 103424470 A CN103424470 A CN 103424470A
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concrete
sensitivity curve
probe
steel tube
interface
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CN103424470B (en
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李世涛
蔡红生
汪毅
吴克华
王朝华
杨旭
耿进峰
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
Henan Jiuyu Enpai Power Technology Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
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    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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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
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Abstract

The invention discloses a method for ultrasonically detecting the bonding state of steel pipes and concrete. The method comprises the following steps: (1), making a compared sample same with the specification of a detected object; (2), detecting whether the compared sample can be used or not; (3), making a sensitivity curve; (4), carrying out detection: using a debugged digital ultrasonic detector to detect the bonding state of a detected steel pipe and concrete, and observing the highest reflection amplitude of multiple times of interface echoes and the envelope diagram form of multiple times of interface echoes of the steel pipe and the concrete; if the highest interface reflection amplitude is higher than the lower line of the sensitivity curve, judging that bonding is bad; if the highest interface reflection amplitude is lower than or equal to the lower line of the sensitivity curve, judging that bonding is good; if the highest interface reflection amplitude is larger than or equal to the upper line of the sensitivity curve, judging that the steel pipe and the concrete are completely debonded. The method can realize fast, complete and reliable non-destructive detection to bonding state of steel pipes and concrete on site, realizes fast and effective evaluation for the bonding state of steel pipes and concrete in the premise that a steel pipe and concrete structure is not destroyed, and reduces manual detection intensity.

Description

The method of a kind of concrete filled steel tube bond state ultrasound examination
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, relate in particular to the lossless detection method of a kind of concrete filled steel tube bond state ultrasound examination.
Background technology
Because concrete filled steel tube has that bearing capacity is high, the advantage such as low, the easy construction of plasticity and good toughness, cost, make it obtain engineering application widely, as bridge, skyscraper and house etc.Thin-walled centrifugal concrete steel tube tower is a kind of as concrete filled steel tube, in the grid power transmission engineering, is widely applied, and especially without bracing wire, floor area is little, in city, is widely used.Once steel pipe and concrete are peeled off, because the engineering accident that concrete filled steel tube damages or inefficacy causes all may occur at any time, directly endanger national wealth and the people's life security.
Whether steel pipe and concrete binding be good, directly has influence on compressive strength and the compression deformation ability of concrete filled steel tube.The concrete steel pipe tower is in manufacture, transportation, installation, use procedure, all likely produce steel pipe and concrete binding is bad, caused the cohesive strength of the two greatly to descend, thereby have a strong impact on steel pipe and concrete plays a role jointly, greatly reduce the bearing capacity rigidity of concrete steel pipe tower, thereby caused the accident of falling the tower to occur.
At present, the domestic and international test method about concrete filled steel tube interface shearing-resistance cohesive strength mainly contains one type: push out test.Push out test is a kind of destructive test, specifically at a materialsed end, leaves one section empty steel pipe, and the other end is placed the billet that an internal diameter is slightly less than steel pipe on the end face of core concrete.During test, test specimen one end is the core concrete pressurized, and the other end is the steel pipe pressurized, so just core concrete is released to steel pipe, determines the shearing resistance cohesive strength.But this kind of mode can not judge the bond state of concrete filled steel tube, push out test need to prepare experimental sample tube, carries out destructive test, expends a large amount of manpower, material resources and financial resources.Therefore, seem particularly important for steel pipe and a kind of easy on-the-spot Dynamic Non-Destruction Measurement of concrete bond state exploitation.
Summary of the invention
The method that the purpose of this invention is to provide the ultrasound examination of a kind of concrete filled steel tube bond state, detection speed is 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), make sensitivity curve in the digital ultrasound detector: the meter sensitivity curve: the 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 the 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 the boundary reflection echo times, and r is Steel concrete interface pressure reflection ratio;
Make the sensitivity curve of N interface echo in the digital ultrasound detector according to above-mentioned sensitivity curve formula;
(2), detect judgement: good digital ultrasound detector carries out the bond state detection to tested concrete filled steel tube to use above-mentioned debugging, detection probe is placed on to the steel pipe side, regulating instrument makes to occur interface echo N time in digital ultrasound detector screen, observe N interface echo form of tested concrete filled steel tube, if roll off the production line and reach the standard grade lower than sensitivity curve higher than sensitivity curve, be judged to be imperfect bonding; If roll off the production line lower than equaling sensitivity curve, be judged to be bonding good; Reach the standard grade if be more than or equal to sensitivity curve, be judged to be complete delamination.
While being detected in described step (2) by detection probe by ultrasonic coupling agent and steel tube surface good contact, at the uniform velocity mobile probe; The 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 ultra-sonic defect detector, its operating frequency range is 0.5MHz～10MHz, instrument at least is linear and shows in full-scale 80% scope of video screen, the horizontal linearity error is not more than 1%, the vertical linearity error is not more than 5%, probe beam axis offset angle should not be greater than 2 °, on the Main beam vertical direction, does not have significantly bimodal.
Described detection probe is high frequency monocrystalline compressional wave normal probe, and the 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 the waveform recording function; The combination frequency of instrument and probe and nominal frequency error 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: the control sample of (1), making and checked object same size: described control sample adopts and checked object same thickness, steel pipe that the material acoustical behavior is identical or close, adopt the concrete with the checked object identical component, adopt with the checked object same process the two is bonded together, make control sample there is the zone of two kinds of adhering states: bonding good zone and the zone of complete delamination;
(2) whether, detect control sample can use: use the digital ultrasound detector, detection probe is positioned over the steel pipe side of bonding good area, with steel pipe, keeps good coupling; Adjusting instrument gain knob interface echo acoustic pressure wave amplitude for the first time reaches the benchmark wave height, measures diverse location interface echo sound pressure level in this zone, and test position is no less than 5 points, asks its mean value Δ Real, Δ=Δ Real-Δ ReasonIf Δ<2dB, mean that steel pipe and concrete binding are good, can be used as the Sensitivity comparison test block; If Δ>=2dB, return to step (1) and again make control sample; Δ wherein Reason=20lgr, r is Steel concrete interface pressure reflection ratio,
Figure BDA00003633753700031
Z wherein 1For acoustic impedance in steel pipe, Z 2For acoustic impedance in concrete, P rReflecting acoustic pressure, P 0It is incident sound pressure;
(3), make sensitivity curve: the steel pipe side by detection probe on the delamination zone of control sample is surveyed interface echo, regulating instrument makes to occur interface echo N time in digital ultrasound detector screen, N >=9, each interface echo made and required to draw according to the distance amplitude curve, reach the standard grade as sensitivity curve; Then by detection probe on the bonding good area of control sample the steel pipe side survey interface echo, regulating instrument makes to occur interface echo N time in digital ultrasound detector screen, each interface echo made and required to draw according to the distance amplitude curve, roll off the production line as sensitivity curve;
(4), detect judgement: good digital ultrasound detector carries out the bond state detection to tested concrete filled steel tube to use above-mentioned debugging, detection probe is placed on to the steel pipe side, regulate instrument and make in digital ultrasound detector screen to occur N interface echo (N > 9), observe N interface echo form of tested concrete filled steel tube, if roll off the production line and reach the standard grade lower than sensitivity curve higher than sensitivity curve, be judged to be imperfect bonding; If roll off the production line lower than equaling sensitivity curve, be judged to be bonding good; Reach the standard grade if be more than or equal to sensitivity curve, be judged to be complete delamination.
When the theory calculating in described step (2) and control sample actual measurement, by adjacent twice interface echo in sound path 100mm place, be calculating object.
The length of pipe section of described control sample is not less than 400mm.
While being detected in described step (4) by detection probe by ultrasonic coupling agent and steel tube surface good contact, at the uniform velocity mobile probe; The 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 ultra-sonic defect detector, has the waveform recording function; Its operating frequency range is 0.5MHz～10MHz, instrument at least is linear and shows in full-scale 80% scope of video screen, the horizontal linearity error is not more than 1%, the vertical linearity error is not more than 5%, probe beam axis offset angle should not be greater than 2 °, on the Main beam vertical direction, does not have significantly bimodal; Described detection probe is high frequency monocrystalline compressional wave normal probe, and the 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; The combination frequency of instrument and probe and nominal frequency error be not more than ± and 10%.
The present invention is a kind of methodology of on-the-spot quick, reliable Non-Destructive Testing of steel pipe and concrete binding state being carried out based on the digital ultrasound detector, it has solved the relevant restriction of original detection method, by analyzing, calculate 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 structures such as electric force pole tower, building pillar.The present invention can realize steel pipe and the concrete binding state is on-the-spot fast, comprehensive, Non-Destructive Testing reliably, with existing push out test, compares, and 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 the Non-Destructive Testing mode to realize the two bond state is estimated fast and effectively under the prerequisite of not destroying concrete filled steel tube, reduce manual detection intensity;
2. existing push out test can be measured steel tube concrete Soil Interface bonding-slippage overall process, and definite 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 need to prepare experimental sample tube and carries out destructive test, expends a large amount of manpower, material resources and financial resources, and this motion method detection speed is fast, and accuracy of judgement is with low cost, saves the man power and material;
4. the present invention adopts a kind ofly 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. calculate by theory control sample steel pipe and the concrete binding state of checking, with control sample, demarcate detection sensitivity, highly sensitive;
6. adopt the interface echo amplitude, repeatedly the interface echo envelope diagram is judged steel pipe and concrete binding state, visual result, reliably.
The accompanying drawing explanation
Fig. 1 is method flow diagram of the present invention;
The sensitivity curve figure that Fig. 2 is interface echo acoustic pressure of the present invention;
The sensitivity curve figure that Fig. 3 is 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), the control sample of making and checked object same size: described control sample adopts and checked object same thickness, steel pipe that the material acoustical behavior is identical or close, adopt the concrete with the checked object identical component, adopt with the checked object same process the two is bonded together, make control sample there is the zone of two kinds of adhering states: bonding good zone and the zone of complete delamination;
(2) whether, detect control sample can use: use the digital ultrasound detector, detection probe is positioned over the steel pipe side of bonding good area, with steel pipe, keeps good coupling; Adjusting instrument gain knob interface echo acoustic pressure wave amplitude for the first time reaches the benchmark wave height, measures diverse location interface echo sound pressure level in this zone, and test position is no less than 5 points, asks its mean value Δ Real, Δ=Δ Real-Δ ReasonIf Δ<2dB, mean that steel pipe and concrete binding are good, can be used as the Sensitivity comparison test block; If Δ>=2dB, return to step (1) and again make control sample; Δ wherein Reason=20lgr,
R is Steel concrete interface pressure reflection ratio,
Figure BDA00003633753700061
Z wherein 1For acoustic impedance in steel pipe, Z 2For acoustic impedance in concrete, P rReflecting acoustic pressure, P 0It is incident sound pressure;
When theoretical calculating herein and control sample actual measurement, by adjacent twice interface echo in sound path 100mm place, be calculating object.
(3), make sensitivity curve: the steel pipe side by detection probe on the delamination zone of control sample is surveyed interface echo, regulate instrument and make in digital ultrasound detector screen to occur N interface echo (N >=9), each interface echo made and required to draw according to the distance amplitude curve, reach the standard grade as sensitivity curve; Then by detection probe on the bonding good area of control sample the steel pipe side survey interface echo, regulating instrument makes to occur interface echo N time in digital ultrasound detector screen, each interface echo made and required to draw according to the distance amplitude curve, as sensitivity curve, roll off the production line, curve as shown in Figure 3 is the curve of drawing out;
(4), detected: use above-mentioned digital ultrasound detector to carry out the bond state detection to tested concrete filled steel tube, detection probe is placed on to the steel pipe side, regulating instrument makes to occur interface echo N time in digital ultrasound detector screen, observe N interface echo form of tested concrete filled steel tube, if roll off the production line and reach the standard grade lower than sensitivity curve higher than sensitivity curve, be judged to be imperfect bonding; If roll off the production line lower than equaling sensitivity curve, be judged to be bonding good; Reach the standard grade if be more than or equal to sensitivity curve, be judged to be complete delamination.
While being detected in described step (4), probe is placed in to 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; The 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: as to comprise the following steps: (1), making sensitivity curve: meter sensitivity curve:
The 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 the 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 the boundary reflection echo times, and r is Steel concrete interface pressure reflection ratio;
Make the sensitivity curve of N interface echo in the digital ultrasound detector according to above-mentioned sensitivity curve formula;
The definition of reference value a: apart from first mapped point of amplitude curve, as reference point, its corresponding instrument gain button reading is called reference value, the dB of unit;
Probe can be placed in to the 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 be adjusted to 90% of screen, this echo is reference point, reads now instrument gain numerical value as reference value.
(2), detect judgement: good digital ultrasound detector carries out the bond state detection to tested concrete filled steel tube to use above-mentioned debugging, detection probe is placed on to the steel pipe side, regulating instrument makes to occur interface echo N time in digital ultrasound detector screen, observe N interface echo form of tested concrete filled steel tube, if roll off the production line and reach the standard grade lower than sensitivity curve higher than sensitivity curve, be judged to be imperfect bonding; If roll off the production line lower than equaling sensitivity curve, be judged to be bonding good; Reach the standard grade if be more than or equal to sensitivity curve, be judged to be complete delamination.
Below detection principle of the present invention is described in detail: digital ultrasound detector used in the present invention is general A type pulse-echo ultra-sonic defect detector, its operating frequency range is 0.5MHz～10MHz, instrument at least is linear and shows in full-scale 80% scope of video screen, the horizontal linearity error is not more than 1%, the vertical linearity error is not more than 5%, probe beam axis offset angle should not be greater than 2 °, on the Main beam vertical direction, does not have significantly bimodal; The digital ultrasound detector has the waveform recording function; The combination frequency of instrument and probe and nominal frequency error be not more than ± and 10%; Described probe is high frequency monocrystalline compressional wave normal probe, and the 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 the Q235 structural steel, and the Q235 steel has isotropy, and the velocity of sound is about 5900m/s, and density is 7800kg/m 3The potpourri that normal concrete is cement and sandstone, apparent density is 1950～2500kg/m 3, be concrete kind the most frequently used in civil engineering work, the velocity of sound is about 4120m/s.According to formula Z=ρ c(ρ, be density, c is the velocity of sound) known steel pipe and concrete have diverse acoustic impedance Z (the important physical amount of characterized medium acoustic characteristic).
When ultrasound wave propagates into another kind of medium from a kind of medium, on the interphase of two media, part energy is reflected back in former medium, claims reflection wave; Another part energy sees through interface and propagates in another kind of medium, claims transmitted wave.Produce the characteristic of reflection, transmission according to ultrasound wave at heterogeneous interface, therefore adopt ultrasonic detection method to estimate the bond state of steel pipe and concrete interface.
If the two bond state is good, when 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, ultrasound wave at pressure reflection ratio r, the transmissivity t of steel/concrete interface is:
r = P r P 0 = Z 2 - Z 1 Z 2 + Z 1 = 1.07 - 4.5 1.07 + 4.5 = - 0.616 (formula 1.1)
t = P t P 0 = 2 Z 2 Z 2 + Z 1 = 2 &times; 1.07 4.5 + 1.07 = 0.384 (formula 1.2)
If steel pipe and concrete produce delamination, have air in the middle of the two and enter, when adopting ultrasound wave from external vertical incident, 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, ultrasound wave is at pressure reflection ratio r, the transmissivity t of steel/Air Interface:
r = P r P 0 = Z 2 - Z 1 Z 2 + Z 1 = 0.00004 - 0.45 0.00004 + 0.45 &ap; - 1 (formula 1.3)
t = P t P 0 = 2 Z 2 Z 2 + Z 1 = 2 &times; 0.00004 4.5 + 0.00004 &ap; 0 (formula 1.4)
According to above-mentioned result of calculation, can find out, when steel pipe and concrete bonding state are good, the pressure reflection ratio at interface is 61%; When delamination occurs, pressure reflection ratio is 100%.When bond state changes, interface also changes hyperacoustic pressure reflection ratio thereupon, therefore adopts special-purpose ultrasonic detection instrument, by measuring conversion judgement steel pipe and the concrete binding state of pressure reflection ratio.
When detecting sound path and be 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:
Figure BDA00003633753700093
(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 poor (N echo) during different bonding state:
&Delta; 12 = 20 nlg r 1 r 2 (n=1,2,3,4 ...) (formula 1.6)
Interface pressure reflection ratio r during according to the known delamination state of formula 1.1-1.3 1=-1, pressure reflection ratio r in interface during in conjunction with kilter 2=-0.616, substitution formula 1.6 calculates the two decibel of difference (table 1):
Table 1 delamination zone with in conjunction with the N time interface echo decibel of good area poor (dB)
Figure BDA00003633753700095
Setting interface echo acoustic pressure (dB) is y, and the interface echo number of times is x, and the above-mentioned data of matching and formula can obtain graph of relation and the functional relation 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:
The 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 the 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 the boundary reflection echo times, and r is Steel concrete interface pressure reflection ratio.
Can carry out fast simple measurement to steel pipe and concrete bond state (good, bad, delamination) according to this functional relation.Be directly proportional to decibel value by the wave amplitude height and can 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|.
Can draw fast the interface echo envelope diagram on instrument according to above-mentioned data, according to reality, detect echo present position, median surface, can judge rapidly that whether the Steel concrete bond state is good.

Claims (10)

1. the method for concrete filled steel tube bond state ultrasound examination is characterized in that: comprise the following steps: (1), make sensitivity curve in the digital ultrasound detector: the meter sensitivity curve:
The 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 the 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 the boundary reflection echo times, and r is Steel concrete interface pressure reflection ratio;
Make the sensitivity curve of N interface echo in the digital ultrasound detector according to above-mentioned sensitivity curve formula;
(2), detect judgement: good digital ultrasound detector carries out the bond state detection to tested concrete filled steel tube to use above-mentioned debugging, detection probe is placed on to the steel pipe side, regulating instrument makes to occur interface echo N time in digital ultrasound detector screen, observe N interface echo form of tested concrete filled steel tube, if roll off the production line and reach the standard grade lower than sensitivity curve higher than sensitivity curve, be judged to be imperfect bonding; If roll off the production line lower than equaling sensitivity curve, be judged to be bonding good; Reach the standard grade if be more than or equal to sensitivity curve, be judged to be complete delamination.
2. concrete filled steel tube bond state ultrasonic detection method according to claim 1 is characterized in that: while being detected in described step (2) by detection probe by ultrasonic coupling agent and steel tube surface good contact, at the uniform velocity mobile probe; The 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 ultra-sonic defect detector, its operating frequency range is 0.5MHz～10MHz, instrument at least is linear and shows in full-scale 80% scope of video screen, the horizontal linearity error is not more than 1%, the vertical linearity error is not more than 5%, probe beam axis offset angle should not be greater than 2 °, on the 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, the 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, it is characterized in that: described digital ultrasound detector has the waveform recording function; The combination frequency of instrument and probe and nominal frequency error 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: the control sample of (1), making and checked object same size: described control sample adopts and checked object same thickness, steel pipe that the material acoustical behavior is identical or close, adopt the concrete with the checked object identical component, adopt with the checked object same process the two is bonded together, make control sample there is the zone of two kinds of adhering states: bonding good zone and the zone of complete delamination;
(2) whether, detect control sample can use: use the digital ultrasound detector, detection probe is positioned over the steel pipe side of bonding good area, with steel pipe, keeps good coupling; Adjusting instrument gain knob interface echo acoustic pressure wave amplitude for the first time reaches the benchmark wave height, measures diverse location interface echo sound pressure level in this zone, and test position is no less than 5 points, asks its mean value Δ Real, Δ=Δ Real-Δ ReasonIf Δ<2dB, mean that steel pipe and concrete binding are good, can be used as the Sensitivity comparison test block; If Δ>=2dB, return to step (1) and again make control sample; Δ wherein Reason=20lgr, r is Steel concrete interface pressure reflection ratio,
Figure FDA00003633753600021
Z wherein 1For acoustic impedance in steel pipe, Z 2For acoustic impedance in concrete, P rReflecting acoustic pressure, P 0It is incident sound pressure;
(3), make sensitivity curve: the steel pipe side by detection probe on the delamination zone of control sample is surveyed interface echo, regulating instrument makes to occur interface echo N time in digital ultrasound detector screen, N >=9, each interface echo made and required to draw according to the distance amplitude curve, reach the standard grade as sensitivity curve; Then by detection probe on the bonding good area of control sample the steel pipe side survey interface echo, regulating instrument makes to occur interface echo N time in digital ultrasound detector screen, each interface echo made and required to draw according to the distance amplitude curve, roll off the production line as sensitivity curve;
(4), detect judgement: good digital ultrasound detector carries out the bond state detection to tested concrete filled steel tube to use above-mentioned debugging, detection probe is placed on to the steel pipe side, regulate instrument and make in digital ultrasound detector screen to occur N interface echo (N > 9), observe N interface echo form of tested concrete filled steel tube, if roll off the production line and reach the standard grade lower than sensitivity curve higher than sensitivity curve, be judged to be imperfect bonding; If roll off the production line lower than equaling sensitivity curve, be judged to be bonding good; Reach the standard grade if be more than or equal to sensitivity curve, be judged to be complete delamination.
7. the method for concrete filled steel tube bond state according to claim 6 ultrasound examination, is characterized in that: when the theory calculating in described step (2) and control sample actual measurement, by adjacent twice interface echo in sound path 100mm place, be calculating object.
8. the method for concrete filled steel tube bond state according to claim 6 ultrasound examination, it is characterized in that: the length of pipe section of described control sample is not less than 400mm.
9. concrete filled steel tube bond state ultrasonic detection method according to claim 6 is characterized in that: while being detected in described step (4) by detection probe by ultrasonic coupling agent and steel tube surface good contact, at the uniform velocity mobile probe; The 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, it is characterized in that: described digital ultrasound detector is general A type pulse-echo ultra-sonic defect detector, has the waveform recording function; Its operating frequency range is 0.5MHz～10MHz, instrument at least is linear and shows in full-scale 80% scope of video screen, the horizontal linearity error is not more than 1%, the vertical linearity error is not more than 5%, probe beam axis offset angle should not be greater than 2 °, on the Main beam vertical direction, does not have significantly bimodal; Described detection probe is high frequency monocrystalline compressional wave normal probe, and the 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; The combination frequency of instrument and probe and nominal frequency error be not more than ± and 10%.
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