CN101131319A - Method for nondestructive detecting length of high speed highway guardrail upright post by ultrasonic guided wave - Google Patents
Method for nondestructive detecting length of high speed highway guardrail upright post by ultrasonic guided wave Download PDFInfo
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- CN101131319A CN101131319A CNA2007101760929A CN200710176092A CN101131319A CN 101131319 A CN101131319 A CN 101131319A CN A2007101760929 A CNA2007101760929 A CN A2007101760929A CN 200710176092 A CN200710176092 A CN 200710176092A CN 101131319 A CN101131319 A CN 101131319A
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Abstract
A method of using ultrasonic guided wave to detect the length of grate column of half buried under different highway roadbed, belongs to nondestructive testing field. The method is to determine parameters of grate column before buried calculate group velocity dispersion curve of grate column before buried; select detection frequency from the curve and input the arbitrary function generator to form a single audio signal through the power amplifier module, switch modules, guided wave transceiver components, stimulate the vertical axisymmetric guided wave mode in the vertical column; the guided wave modal generate end echo when encounter the end of the column, the end echo is sent to oscilloscope through guided wave transceiver components and switch modules, determine the corresponding time of end echo, obtain the group velocity from the group velocity dispersion curve, multiple the group velocity with the echo time, divided by 2 to obtain the length of column. The present invention has the advantages of do not need to consider surrounding medium of column, high detection accuracy and of low cost.
Description
Technical field
The present invention relates to a kind of method of utilizing the supersonic guide-wave Non-Destructive Testing partly to be embedded in the length of high speed highway guardrail upright post in the roadbed, belong to the Non-Destructive Testing field.
Background technology
For the subtend track initiation traffic hazard that prevents to go out highway or sail highway at the automobile of running on expressway, all set up anticollision barrier in the trackside of Modern High-Speed highway and the central partition, fence upright is the main load bearing component of guardrail.Because working environment is more abominable, penetrate in the stratum as liquid such as moisture, humid air, rainwater, cause fence upright generation local corrosion and cause the corrosion cracking of column.In addition, in the work progress, indivedual construction parties are used inferior materials and turned out substandard goods for seeking illegal profit, often shorten the length of fence upright without authorization, make it not reach the design loading strength, cause potential accident potential for the safe operation of highway.Because highway guard rail upright post partly is embedded in the roadbed of highway, its failure mode exists very strong disguise, it is effectively detected particularly bury the very big difficulty of ground part existence.
National standard employing method at present is that column is extracted check, perhaps excavates, and yet useful manual method of knocking vibrations is not seen the relevant report of utilizing the supersonic guide-wave method to detect.
Summary of the invention
The objective of the invention is to propose a kind of detection method of new length of high speed highway guardrail upright post, this method is not subjected to the influence of road soil kind on every side, under the prerequisite of not destroying highway subgrade, can realize simple, fast, detect the length that partly is embedded in fence upright in the roadbed exactly.
The present invention is a kind of method of utilizing the supersonic guide-wave Non-Destructive Testing partly to be embedded in fence upright length in the different medium, it is characterized in that this kind method detects according to the following steps:
1) determines effective diameter, wall thickness, density, longitudinal wave velocity, the transverse wave speed of detected fence upright;
2) never bury ground column group velocity dispersion curve on selecting frequency in the 50kHz-200kHz scope, the vertical axisymmetry mode institute respective frequencies of group velocity between 5300m/s-5400m/s detects frequency, in this frequency and group velocity scope, bury ground before and bury the dispersion curve of rear column identical;
3) with selected detection frequency input high-frequency signal generator 1, high frequency signal generator 1 generates centre frequency and detects the single audio signal of frequency for this, after amplifying, power amplifier module 2 obtains higher driving voltage, transfer to the bimodal guided wave probe 4 that places the fence upright end that is embedded in roadbed by Signal Separation switch module 3, excitation longitudinal axis symmetry guided wave modal in fence upright; This guided wave modal runs into the post end generation and reflects to form echoed signal, receives these end face echoed signals by same bimodal guided wave probe 4, transfers to oscillograph 5 through change-over switch module 3; Determine the corresponding time of end face echo by the end face reflection oscillogram that oscillograph 5 shows, from the group velocity dispersion curve of column, obtain detecting the group velocity of longitudinal mode under the frequency, multiply by the corresponding time of reflection echo with this group velocity, divided by 2, promptly obtain being embedded in the length of the fence upright in the roadbed.
Described bimodal is led probe 4 and is piezoelectric supersonic guided wave probe or magnetostriction probe.
The present invention mainly has the following advantages: (1) need not to consider the column influence of roadbed material on every side, determines to detect frequency with the dispersion curve that does not bury the ground column; (2) used frequency range far exceeds outside nature and the common vibration frequency range, not influenced by operating mode; (3) accuracy in detection height, error can engineering demands; (4) detection speed is fast, and highway subgrade is not destroyed, and it is low to detect cost.
Description of drawings
Fig. 1 pick-up unit schematic diagram
Fig. 2 detection method schematic flow sheet
The vertical axisymmetry mode group velocity of Fig. 3 column dispersion curve
Fig. 4 pumping signal centre frequency is received when being 100kHz is embedded in fence upright end face reflection waveform in the roadbed
Embodiment
Provide following examples below in conjunction with content of the present invention:
As shown in Figure 1, the present embodiment central post is length 1800mm, internal diameter 105mm, external diameter 114mm, the weldless steel tube of wall thickness 4.5mm.Density is 7800kg/m
3, longitudinal wave velocity is 5960m/s, transverse wave speed is 3260m/s.Surrounding medium is 1.7g/cm
3Compacting soil.
1) according to the parameter of fence upright and subgrade soils, calculate the group velocity dispersion curve, choosing group velocity in the 50-200kHz scope is that the respective frequencies 100kHz of 5340m/s mode institute is as detecting frequency;
2) will detect frequency input arbitrary-function generator 1, arbitrary-function generator 1 produces the single audio signal that centre frequency is 100kHz.Carry out voltage amplification through power amplifier module 2, put on the bimodal guided wave probe 4, in tested column, produce longitudinal axis symmetry guided wave modal through change-over switch module 3; Bimodal guided wave probe 4 is made up of piezoelectric probe, magnetostriction probe;
3) above-mentioned longitudinal axis symmetry guided wave modal is in the other end of column reflection, and guided wave receiving/sending element receives the end echoed signal of longitudinal wave guide, through change-over switch module 3, behind the amplified current signal, sends into oscillograph 5;
4) according to the end face reflection oscillogram that shows on the oscillograph 5, determine the end face echo time, it be multiply by longitudinal wave guide mode pairing group velocity on column group velocity dispersion curve under this frequency, and, promptly obtain strut length divided by 2.
Fig. 4 is embedded in high speed highway guardrail upright post end face reflection oscillogram in the roadbed for the part that is received under the 100kHz frequency.The end face echo time is 0.667ms for the first time, and the group velocity of free column guided wave modal is 5340m/s under this frequency, so strut length is calculated as 1781mm, error only is 1.13%.
Claims (2)
1. method of utilizing the supersonic guide-wave Non-Destructive Testing partly to be embedded in dissimilar fence upright length in express highway roadbed is characterized in that this kind method detects according to the following steps:
1) determines effective diameter, density, longitudinal wave velocity, the transverse wave speed of detected column, calculate the group velocity dispersion curve of embedding front column;
2) from the group velocity dispersion curve of embedding front column selecting frequency in 50～200kHz scope, group velocity is in the vertical axisymmetry mode of 5300m/s～5400m/s institute respective frequencies, as detecting frequency, in this frequency and group velocity scope, bury before the ground with bury ground after dispersion curve identical;
3) with selected detection frequency input high-frequency signal generator (1), high frequency signal generator (1) generates centre frequency and detects the single audio signal of frequency for this, after amplifying, power amplifier module (2) obtains higher driving voltage, transfer to the guided wave receiving/sending element (4) that places the fence upright end that is embedded in roadbed by Signal Separation switch module (3), excitation longitudinal axis symmetry guided wave modal in fence upright; This guided wave modal runs into the post end generation and reflects to form echoed signal, receives this end face echoed signal by same guided wave receiving/sending element (4), transfers to oscillograph (5) through change-over switch module (3); Determine the corresponding time of end face echo by the end face reflection oscillogram that oscillograph (5) shows, from the group velocity dispersion curve of column, obtain detecting the group velocity of longitudinal mode under the frequency, multiply by the corresponding time of reflection echo with this group velocity, divided by 2, promptly obtain the length that part is embedded in the fence upright in the roadbed.
2. a kind of method of utilizing the supersonic guide-wave Non-Destructive Testing partly to be embedded in fence upright length in the dissimilar roadbeds according to claim 1 is characterized in that: described guided wave receiving/sending element (4) is piezoelectric supersonic probe, magnetostriction probe for bimodal guided wave probe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101760929A CN101131319A (en) | 2007-10-19 | 2007-10-19 | Method for nondestructive detecting length of high speed highway guardrail upright post by ultrasonic guided wave |
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| CNA2007101760929A CN101131319A (en) | 2007-10-19 | 2007-10-19 | Method for nondestructive detecting length of high speed highway guardrail upright post by ultrasonic guided wave |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922922A (en) * | 2010-06-18 | 2010-12-22 | 北京工业大学 | Angle probe-based ultrasonic guided wave testing method for length of highway guardrail posts |
| CN102830173A (en) * | 2012-08-29 | 2012-12-19 | 北京工业大学 | Shaft structure surface acoustic wave non-contact wave velocity extraction method |
| CN102841143A (en) * | 2012-08-29 | 2012-12-26 | 广东电网公司电力科学研究院 | Method for detecting corrosion of grounded grid circular steel bar based on lateral loading of piezoelectric sensors |
| CN103411567A (en) * | 2013-04-19 | 2013-11-27 | 北京工业大学 | Detector for amount of carbon deposit in heat carrier furnace pipeline based on longitudinal guided wave and detection method thereof |
| CN105423967A (en) * | 2016-01-25 | 2016-03-23 | 国网浙江慈溪市供电公司 | Handheld type measuring instrument for measuring buried depth of telegraph pole and controller of handheld type measuring instrument |
| CN108375356A (en) * | 2018-03-12 | 2018-08-07 | 交通运输部公路科学研究所 | The strut length of guardrail determines method, apparatus and computer readable storage medium |
| CN108469236A (en) * | 2018-02-11 | 2018-08-31 | 北京航空航天大学 | A kind of intelligent column buried depth probe suitable for guardrail movement inspection platform |
| CN112179298A (en) * | 2020-08-21 | 2021-01-05 | 成都现代万通锚固技术有限公司 | Method for detecting length of anchor rod through natural frequency |
| CN112197720A (en) * | 2020-01-07 | 2021-01-08 | 浙江大学 | Method and device for measuring length of concealed columnar steel structure based on ultrasonic guided wave sound field regulation and control technology |
-
2007
- 2007-10-19 CN CNA2007101760929A patent/CN101131319A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922922A (en) * | 2010-06-18 | 2010-12-22 | 北京工业大学 | Angle probe-based ultrasonic guided wave testing method for length of highway guardrail posts |
| CN102830173B (en) * | 2012-08-29 | 2014-07-16 | 北京工业大学 | Shaft structure surface acoustic wave non-contact wave velocity extraction method |
| CN102830173A (en) * | 2012-08-29 | 2012-12-19 | 北京工业大学 | Shaft structure surface acoustic wave non-contact wave velocity extraction method |
| CN102841143A (en) * | 2012-08-29 | 2012-12-26 | 广东电网公司电力科学研究院 | Method for detecting corrosion of grounded grid circular steel bar based on lateral loading of piezoelectric sensors |
| CN103411567B (en) * | 2013-04-19 | 2016-08-24 | 北京工业大学 | Heat carrier furnace pipeline carbon deposition quantity detector based on longitudinal wave guide and detection method |
| CN103411567A (en) * | 2013-04-19 | 2013-11-27 | 北京工业大学 | Detector for amount of carbon deposit in heat carrier furnace pipeline based on longitudinal guided wave and detection method thereof |
| CN105423967A (en) * | 2016-01-25 | 2016-03-23 | 国网浙江慈溪市供电公司 | Handheld type measuring instrument for measuring buried depth of telegraph pole and controller of handheld type measuring instrument |
| CN108469236A (en) * | 2018-02-11 | 2018-08-31 | 北京航空航天大学 | A kind of intelligent column buried depth probe suitable for guardrail movement inspection platform |
| CN108375356A (en) * | 2018-03-12 | 2018-08-07 | 交通运输部公路科学研究所 | The strut length of guardrail determines method, apparatus and computer readable storage medium |
| CN112197720A (en) * | 2020-01-07 | 2021-01-08 | 浙江大学 | Method and device for measuring length of concealed columnar steel structure based on ultrasonic guided wave sound field regulation and control technology |
| CN112197720B (en) * | 2020-01-07 | 2021-11-16 | 浙江大学 | Method and device for measuring length of concealed columnar steel structure based on ultrasonic guided wave sound field regulation and control technology |
| CN112179298A (en) * | 2020-08-21 | 2021-01-05 | 成都现代万通锚固技术有限公司 | Method for detecting length of anchor rod through natural frequency |
| CN112179298B (en) * | 2020-08-21 | 2021-11-26 | 成都现代万通锚固技术有限公司 | Method for detecting length of anchor rod through natural frequency |
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