CN100442011C - Apparatus and method for measuring burial depth of guard rail steel pipe post by employing elastic wave - Google Patents
Apparatus and method for measuring burial depth of guard rail steel pipe post by employing elastic wave Download PDFInfo
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- CN100442011C CN100442011C CNB2006100034376A CN200610003437A CN100442011C CN 100442011 C CN100442011 C CN 100442011C CN B2006100034376 A CNB2006100034376 A CN B2006100034376A CN 200610003437 A CN200610003437 A CN 200610003437A CN 100442011 C CN100442011 C CN 100442011C
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Abstract
The present invention relates to a detecting device and the detecting method for measuring embedded depths of guardrail steel-pipe posts by adopting shock elastic waves, which belong to the technical field of road traffic safety facilities. One end of the side wall of a guardrail steel-pipe post is provided with a sensor, so that elastic waves generated from an oscillating hammer are transferred to the other end of the post in the direction of the post axis and reflected back from the end, and elastic wave signals detected by the sensor are amplified through a charge amplifier and then transmitted to a terminal computer for calculation and display after being converted into digital signals through a channel pedestal and an analog-digital conversion card. The researched detecting method gives out specific operation steps for analyzing the characteristics of the reflection waves to estimate the embedded depth of the steel pipe by utilizing the reflection of the shock elastic waves on both ends of the buried steel pipe. The present invention can fast, easily and accurately measure the embedded depth of the steel pipe post of road guardrail and provide the detecting device and the detecting method thereof.
Description
Technical field
The invention belongs to highway traffic safety facility field, particularly a kind of checkout equipment and detection method that adopts impact elasticity wave measurement guard rail steel pipe post buried depth.
Background technology
From the highway projects of having built up, most of project quality has reached code requirement, but because technological means is limited, and there is hidden danger in the some projects concealed work, safety problem makes us surveying sorrow.The problem of the degree of depth wretched insufficiency of high speed highway guardrail upright post buried depth and the serious consequence that causes has caused showing great attention to of people especially for example.
The outer side rail of highway is called " the last item securing band of driver ", play a part effective reduction vehicular impact power, slow down the speed of a motor vehicle, prevent that vehicle from going out roadbed, therefore, the screw of guardrail, column even use, bolt all have the strict design requirement.Wherein highway corrugated beam barrier and cable guardrail are most widely used security protection facilities, and still, investigation finds that just obviously there is hidden danger of quality in the guardrail as Shanxi Qi faces highway the 6th bid section.This highway has been open to traffic nearly two years after pre-the examination.According to construction requirement, as this example, road outside fence upright length overall should be 1.97 meters, imbeds under ground portion and should reach 1.25 meters.But selective examination finds that what underground inlet part was short only has 30 centimetres, and the longest also has only about 60 centimetres.All there is the not enough phenomenon of inlet part strut length to some extent in whole highway section.
Past is not because there is the respective detection technology and equipment, can't detect concealed works such as buried guardrails, just make the engineering that did not meet the construction quality requirement originally but pass through examination, brought serious in the future traffic safety hidden danger, can simply know other highways by inference by last example and when checking and accepting, have same problem, the end of the year 2004, China's highway mileage open to traffic has reached 3.52 ten thousand kilometers, according to national freeway net construction plan, in the period of following 30, China will welcome the expressway construction climax, form 8.5 ten thousand kilometers national freeway nets, each bar highway all be unable to do without burying underground and detecting of fence upright, therefore research and develop out how to use the easiest method inspection, the length of embedment of the fence upright steel pipe that test has set, do not destroy simultaneously the structure of guardrail again, just become the acceptance of work and safety inspection urgent problem.
The present invention adopts the impact elasticity ripple in the reflection of burying guard rail steel pipe two ends, ground, and the characteristic of analyzing its reflection wave is inferred the checkout equipment and the method for the length of embedment of steel-pipe pile.
Summary of the invention
The technical issues that need to address of the present invention are, the length of embedment of the fence upright steel pipe that has set with the easiest method inspection, test how is not destroyed simultaneously the structure of guardrail again.
The object of the invention is to provide checkout equipment and the detection method that adopts impact elasticity wave measurement guard rail steel pipe post buried depth, for realizing the object of the invention, finish by the following technical solutions, a kind of checkout equipment that adopts impact elasticity wave measurement guard rail steel pipe post buried depth, comprise and adopt computer as display terminal, it is characterized in that: the end on the guard rail steel pipe post sidewall is provided with a sensor, make and send out elastic wave that vibration hammer sends and be delivered to the column other end and elastic wave reflex returned by this end along the column direction of principal axis, sensor to the elastic wave signal amplify by charge amplifier, again through analog to digital conversion, become digital signal and be sent to terminal computer and calculate demonstration.In this checkout equipment of invention research, at first also invented this detection technique method, sending out of impact elastic wave shaken, the breakthrough of innovation is all arranged in the calculating of the acquisition process of signal, testing result.This method is, a kind of detection method of using the measurement guard rail steel pipe post buried depth of the said equipment, adopt of the reflection of impact elasticity ripple at the buried steel pipe two ends, the characteristic of analyzing its reflection wave is inferred the length of embedment of steel pipe, it is characterized in that: this method is operated according to the following steps, a. with a vibration hammer steel pipe is sent out and shaken, change and to be arranged on shake piece and send out the size and the material of vibration hammer of sending out on the steel pipe sidewall, change the position of sending out shake piece and sensor, shake with sending out of realization distinct methods, again the collecting test data; B. synthetic reaching revised institute's test data; C. according to different tested objects, select spectrum analysis or related resolution, calculate buried depth steel pipe length; D. carry out statistical treatment, saving result.
The invention has the beneficial effects as follows, solved quick, the easy and measurement accurately of the depth of burying of highway barrier steel pipe post, provided the technical method step of checkout equipment and detection.The present invention also is applicable to the measurement of the depth of burying of other steel pipe post.
Description of drawings
Fig. 1 is a column buried depth checkout equipment synoptic diagram;
Fig. 2 a is the detected object synoptic diagram;
Fig. 2 b adopts Direct Recognition method synoptic diagram in the testing process;
Fig. 2 c adopts repeated reflection method synoptic diagram in the testing process;
Fig. 3 detection method schematic flow sheet.
Embodiment
With reference to Fig. 1, expression highway barrier steel pipe post buried depth checkout equipment synoptic diagram, tested column 1 total length L among the figure, ground surface expose height H, imbedding under ground portion is D, produce vibration wave to send out the piece that shakes be 2, a sensor 3 is set on the column surface, be connected to amplifier 5 and power supply 6 thereof by charge transfer line 4, amplifier out is connected to channel pedestal 8 by concentric cable 7, through A/D card 9, be connected to computer 10, be to adopt portable computer in this example herein.Represent by the side object and the principle schematic of using in detecting with reference to Fig. 2 a-2c.The height H of exposing of ground surface is easy to measure, as long as therefore can accurately measure the total length L of column, just can extrapolate the buried depth D of column at an easy rate.Therefore, the detection method of this research is the total length by the test column, and then calculates its buried depth.
In this project, be to adopt impact elasticity wave reflection characteristic directly to test strut length, the formation of its test macro equipment as shown in Figure 1.
Sensor sticks to an end on the side walls on post top, sends out the elastic wave of shaking and propagates along the direction of pillar axle, in the reflection of the post other end, analyzes the characteristic of its reflection wave and calculates column length and length of embedment.
Utilize the method for impact elasticity reflection wave, two kinds of processing modes arranged:
(1) method of Direct Recognition reflection wave
Column length is long, and the time marquis that buried depth is darker can Direct Recognition reflection wave (Fig. 2 b).
Capital can be tried to achieve by following formula to the distance L of post bottom:
L＝V.T/2
Wherein, V is the elasticity velocity of wave propagation.For ferrous material, its elastic wave (P ripple) speed is 5.064km/s.The situation that the wall of pillar is thin, p wave interval velocity more or less slightly reduces, and preferably can actual test in the use.
The built-in oscillation signal that shakes is very strong when sending out, when reflection wave is not easy to identify, can adopt half-wavelength to move and send out the method for shaking, changing the relative position of sending out shake piece and sensor tests, the survey waveform is moved, overlap-add procedure can be eliminated the influence of most of built-in oscillation signal, and Direct Recognition goes out reflection wave.
(2) utilize the method for the repeated reflection characteristic of elastic wave
Imbed more shallow situation for pillar, send out shake ripple and reflection wave and mix, the identification of reflection wave is difficulty very.In addition, because the influence of noise etc., under many circumstances can't the perception reflex ripple.At this moment, it also is very effective utilizing the repeated reflection characteristic of elastic wave.
If the repetition period is Tc, then can be in the hope of the total length L of post by (1).Tc can be resolved by frequency spectrum and try to achieve.
According to domestic and international investigation, actually rare about the research of highway steel pipe post buried depth at present about research and product.But for the deterioration of concrete column (electric pole, electric light bar etc.), a lot of mechanisms have done a large amount of research.Crack Detection as concrete column.The fracture of inner prestressed reinforcing bar detects research etc.
With reference to Fig. 3, represent detection method schematic flow sheet of the present invention, shown each step of process of analysis among the figure.
Claims (2)
1. checkout equipment that adopts impact elasticity wave measurement guard rail steel pipe post buried depth, comprise and adopt computer as display terminal, it is characterized in that: the end on the guard rail steel pipe post sidewall is provided with a sensor, make and send out elastic wave that vibration hammer sends and be delivered to the column other end and elastic wave reflex returned by this end along the column direction of principal axis, sensor to the elastic wave signal amplify by charge amplifier, again by channel pedestal and analog-to-digital conversion card, become digital signal and be sent to terminal computer and calculate demonstration.
2. method of using checkout equipment as claimed in claim 1 to measure the guard rail steel pipe post buried depth, adopt of the reflection of impact elasticity ripple at the buried steel pipe two ends, the characteristic of analyzing its reflection wave is inferred the length of embedment of steel pipe, it is characterized in that: this method is operated according to the following steps, a. with a vibration hammer steel pipe is sent out and shaken, change and to be arranged on shake piece and send out the size and the material of vibration hammer of sending out on the steel pipe sidewall, change the position of sending out shake piece and sensor, shake with sending out of realization distinct methods, again the collecting test data; B. synthetic reaching revised institute's test data; C. according to different tested objects, select spectrum analysis or related resolution, calculate buried depth steel pipe length; D. carry out statistical treatment, saving result.
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| CNB2006100034376A CN100442011C (en) | 2006-02-08 | 2006-02-08 | Apparatus and method for measuring burial depth of guard rail steel pipe post by employing elastic wave |
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| CNB2006100034376A CN100442011C (en) | 2006-02-08 | 2006-02-08 | Apparatus and method for measuring burial depth of guard rail steel pipe post by employing elastic wave |
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| CN100442011C true CN100442011C (en) | 2008-12-10 |
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| CN102507743B (en) * | 2011-11-03 | 2014-08-20 | 北京星通联华科技发展股份有限公司 | Nondestructive testing method of bridge prestressed duct grouting compactness |
| CN105509666A (en) * | 2015-12-01 | 2016-04-20 | 国网浙江省电力公司丽水供电公司 | Method for detecting burial depth of concrete pole |
| CN105607067A (en) * | 2016-01-25 | 2016-05-25 | 国网浙江慈溪市供电公司 | Measurement method for measuring burying depth of wire pole |
| 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 |
| CN105865397B (en) * | 2016-05-10 | 2019-01-01 | 中国电建集团华东勘测设计研究院有限公司 | The effective anchorage depth lossless detection method of overall length binding type anchor pole and device |
| CN108375356B (en) * | 2018-03-12 | 2020-05-12 | 交通运输部公路科学研究所 | Method and device for determining length of upright post of guardrail and computer readable storage medium |
| CN109357643B (en) * | 2018-11-09 | 2020-09-15 | 山东省交通科学研究院 | Nondestructive detection method and device for embedded depth of guardrail upright post |
| CN111256610B (en) * | 2020-02-27 | 2021-05-04 | 交通运输部公路科学研究所 | Device and method for measuring embedded depth of upright post of plug-in type edge-approaching guardrail |
| CN111595374B (en) * | 2020-05-06 | 2021-10-19 | 三峡大学 | Telegraph pole buried depth and damage detection method based on Rayleigh waves |
| CN112362733A (en) * | 2020-10-27 | 2021-02-12 | 四川陆通检测科技有限公司 | Detection device and method for detecting buried depth and damage of highway anti-collision guardrail stand column |
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| JPH10253601A (en) * | 1997-03-05 | 1998-09-25 | Hokuriku Biitsuku Chika Tansa Kk | Strength determination method of ground improving body |
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