CN101650318A - Nondestructive examination device and method of crack defects of inner surface of underground foundation embedded section of electric pole - Google Patents
Nondestructive examination device and method of crack defects of inner surface of underground foundation embedded section of electric pole Download PDFInfo
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- CN101650318A CN101650318A CN200910170289A CN200910170289A CN101650318A CN 101650318 A CN101650318 A CN 101650318A CN 200910170289 A CN200910170289 A CN 200910170289A CN 200910170289 A CN200910170289 A CN 200910170289A CN 101650318 A CN101650318 A CN 101650318A
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Abstract
The invention provides a nondestructive examination device of crack defects of the inner surface of an underground foundation embedded section of a reinforced concrete electric pole, which comprises asupporting sleeve and an autoscope system. The invention also provides a nondestructive examination device of the crack defects of the inner surface of the underground foundation embedded section ofthe reinforced concrete electric pole, which comprises the following steps: extending a flexible electronic video industrial autoscope into the electric pole through a drain hole of the electric poleby using the supporting sleeve, and positioning the flexible electronic video industrial autoscope at the axes of the electric pole; realizing movements in vertical direction and rotating direction through external control by an autoscope probe, and transmitting the collected image of the inner surface of the electric pole to an external video monitor so that detection staffs can observe and judgethe crack defects. The invention has convenient field test operation without dismantling the electric pole and is suitable to the safety operation maintenance of various electric poles in an overheadpower transmission line project.
Description
Technical field
The present invention relates to a kind of the cannot-harm-detection device and method of reinforced concrete pole crack defects of inner surface of underground foundation embedded section, be particularly related to Non-Destructive Testing real-time, belong to safe operation maintenance of electrical network Overhead Line Project and maintenance technology field the electric pole crack defects of inner surface in the on-line operation.
Background technology
Reinforced concrete pole is the widely used a kind of electric pole of China 10-220 kilovolt Overhead Line Project, requirement according to electric pressure and structural strength, amount of deflection, usually be divided into single pole or H-frame pole (two bar) line construction pattern, every bar is made up of 1～3 bar section, wall thickness is generally 30mm～50mm, total length is 6m～15m, belongs to annular, hollow, thin-walled, slim-lined construction, and this structural shape is the innate factor that the bar section cracks.Electric pole is in operational process, because unaccelerated aging and be subjected to dead load and the effect of changing load (as gravity, icing, suitable circuit unbalanced tensile force, transverse horizontal wind-force and vibration etc.), fatigue can occur, this fatigue shows as shaft generation shallow fine cracks at first.Along with air, rainwater and wet gas gradually to internal corrosion, reinforcing bar begins corrosion after touching air, humidity, its bulging force can make crackle width, length increase gradually, even causes the cement of reinforcing bar outside to come off.If these defectives can not in time be found and handle, will produce fracture or inclination accident when running into problem such as unbalance stress, inner ponding, serious icing when electric pole.Typical example is in China south " ice damage " to take place in 2008, and this disaster has caused a lot of electric pole fractures, inclination and collapse accident in the power transmission sequence.Its reason is exactly because the accumulated snow and the superpower external force effect of icing and the concrete cracks of pole-foundation buried depth section cause reinforcing bar corrosion over a long time, strength reduction.
Development along with electric utility, power transmission sequence is more and more, aged circuit increases year by year, the electric pole seminess is serious, therefore, strengthen the electric pole crack defect and detect, particularly infant cracking detects, and according to national grid " overhead transmission line operation and inspection code " and " 18 great anti-accident measures of national grid " requirement, in time getting rid of incipient fault is the important channel of improving electric pole power transmission sequence opposing disaster ability, guaranteeing electric power netting safe running and preventing accident and take place.
Reinforced concrete pole is divided into ordinary reinforced concrete electric pole and prestressed concrete electric pole, China's " aerial power transmission line operating standard " (DL/T741-2001) stipulates: crackle appears in prestressed concrete electric pole, the vertical, horizontal crackle appears in the ordinary reinforced concrete electric pole, should handle when width surpasses 0.2mm.Because single electric pole generally is to be formed by connecting by ring flange or drift bolt pipe by 1～3 bar section, can guarantee centrifugal workmanship and stacking, transportation, construction and installation and the convenient disassembly of bar section, therefore, the crackle of a bar section generation can not pass to another root bar section.
Statistics shows that electric pole is the bar section at two ends up and down, and promptly tower head cross-arm position and embedded depth of foundation position ratio are easier to occur crackle.Because China lacks pick-up unit and the method that the electric pole crackle is detected at present, when certain position at electric pole went wrong, the maintenance scheme often was the method that adopts full bar to change.The preparation of construction time and the line outage time of this method are long, the renewal cost height.And operating electric pole in most cases just wherein one section go wrong, if can adopt effective detection method to judge problem bar section, just can only change problem bar section, and not need full bar replacing, can significantly reduce like this and change bar expense and power off time.
Existing safety detection to electric pole mainly is limited to the inspection to the electric pole outside surface.Method is: electric pole aerial part outside surface is carried out visual inspection, find crack defect, measure crack size by joint meter again and judge whether to exceed standard; Detection to underground foundation embedded section outside surface then needs to formulate special excavation inspection program, adopt the method for special excavation, remove the soil that buries around the buried depth section electric pole, and the method that washes with water detects after the electric pole appearance is cleaned up, detecting finishes will bury that earthen backfill is restored and compacting again.Therefore, the workload that has the method that electric pole ground hypomere external crack is checked now is bigger, and inconvenient operation can only be carried out the external crack inspection to the part of electric pole ground hypomere, and operation has certain negative effect to the electric pole circuit.Yet the crack defect that electric pole inside and those human eyes of inside surface be cannot see the position detects does not also have effective means so far, and customary safety inspection can't detect these positions at all, causes the safety inspection of electric pole imperfectly, has stayed potential safety hazard.
In order to address the above problem, the invention provides a kind of the cannot-harm-detection device and method that is applicable to that crack defects of inner surface of underground foundation embedded section of electric pole detects, solved the technical barrier that insurmountable always crack defects of inner surface of underground foundation embedded section of electric pole detects, to guarantee the safe operation of electric pole circuit.
Summary of the invention
An object of the present invention is to provide a kind of device that can carry out Non-Destructive Testing to the reinforced concrete pole crack defects of inner surface of underground foundation embedded section that the power transmission sequence engineering is used.
Another object of the present invention provides a kind of method that can carry out Non-Destructive Testing to the reinforced concrete pole crack defects of inner surface of underground foundation embedded section that the power transmission sequence engineering is used.
The present invention is based on following principle: the reinforced concrete pole structural design should satisfy the concerned countries standards and norms, and except that offering osculum and ground hole, generally not allowing increases the perforate number on electric pole, avoid electric pole intensity is had a negative impact.In recent years, because in the transmission and transformation engineering construction, the electric pole masthead has installed the top board sealing additional, while has been adopted the concrete casting scheme with the ground base section that underground foundation embedded section of electric pole joins, so that electric pole and ground are combined closely, thereby reduced the possibility of electric pole bar section water inlet, made intrinsic osculum usually be in idle state.Because osculum is positioned at the electric pole aerial part, and (conventional design is 1.7m place at the bottom of bar recently with the buried depth section, wherein buried depth is generally 1～1.5m), therefore, the present invention expands the osculum purposes, with it as detecting the hole, utilize existing electric video industrial endoscope (hereinafter to be referred as endoscope) technology, the endoscope probe of endoscope is extend into underground foundation embedded section of electric pole and need detect the position by detecting the hole, gather the status image of electric pole inside surface, and be transferred on the electric pole external video monitor and show, for testing staff's observation, thereby realize Non-Destructive Testing to the electric pole crack defects of inner surface.When in detecting, finding crack defect, crackle image and the standard crackle image of demarcating good 0.2mm width are in advance compared, just judge whether the electric pole crackle exceeds standard.
Because the electric pole osculum can only be opened between the two adjacent reinforcing bars, be subjected to spacing restriction between the reinforcing bar, its aperture is generally less than 30mm, and the endoscope probe diameter is generally 6～20mm, can insert length more than 2m, resolution generally can reach 0.1mm, and therefore, detection method of the present invention and pick-up unit are not subjected to the influence and the restriction of former project organization of electric pole and size.
On the one hand, the invention provides a kind of crack defects of inner surface of underground foundation embedded section of electric pole the cannot-harm-detection device, this device is made up of stop sleeve and endoscopic system.Endoscopic system is made up of endoscope probe, signal wire, flexible hose, peripheral control unit, video monitor, connector and computing machine.Endoscope probe is made up of object lens, light source and CCD camera.Flexible hose links to each other with computing machine with external power source by connector.
The center line and the electric pole dead in line of endoscope probe when detecting at the scene for assurance, the present invention has made the stop sleeve that is used to detect especially, and it is the indispensable important component part of pick-up unit of the present invention.
In a kind of preferred embodiment, described stop sleeve is a cylindrical tubular shape, has a ring flange in the stop sleeve outer end.
In another kind of preferred embodiment, the stop sleeve outside surface with detect the hole in the section of cooperation of steel pipe partly process annular shallow slot, and in shallow slot the magnetic rubber of bonding suitable thickness, make stop sleeve contact and suck fixing with the detection hole.
In another preferred embodiment, draw ring of design on ring flange is so that take out the stop sleeve that sucks detecting on the hole.
The size of stop sleeve is to detect size, endoscope probe diameter and the design of flexible hose bending radius in hole according to electric pole to be measured.The external diameter of stop sleeve is slightly smaller than the diameter that detects the hole, and the two be a clearance fit, and to guarantee its insertion electric pole smoothly, the internal diameter of stop sleeve is a bit larger tham the diameter of endoscope probe, is not swiped when guaranteeing that endoscope probe is put into stop sleeve.After the flexible hose that endoscope probe is housed enters electric pole by stop sleeve because the weight of endoscope probe and sagging naturally, and stop sleeve contact terminal and hanging portion between a circular arc curvature transition section is arranged.Be to guarantee sagging center line of flexible hose and electric pole dead in line, the Design of length of stop sleeve should be considered above-mentioned circular arc curvature transition section, this transition section can demarcate in the laboratory test on the test specimen definite.
Because when making electric pole, osculum (promptly detecting the hole) is to utilize one the steel pipe of wearing pole diameter is made mould to form, remove the center section steel pipe behind the pore-forming, and the steel pipe of reservation and electric pole bar wall coupling part, therefore, detect hole (steel pipe) axis and electric pole axis normal and crossing, after stop sleeve correctly inserts the detection hole, both center lines can overlap, promptly the center line of stop sleeve can with the electric pole intersect vertical axis.
At ring flange of stop sleeve outer end design, position with its end face, can add the pad adjustment between ring flange and the electric pole, make stop sleeve and detect the hole central lines; For stop sleeve is maintained static in testing process, can the stop sleeve outside surface with detect the hole in process annular shallow slot on the section of cooperation of steel pipe, the magnetic rubber of bonding suitable thickness in shallow slot makes stop sleeve contact and suck fixing with the detection hole.Stop sleeve is being positioned at the inner end design circular arc chamfering of electric pole, and the guiding flexible hose steadily leaves stop sleeve and sagging, reduces friction between the two simultaneously.
In addition, can on ring flange, design a draw ring, so that take out the stop sleeve that sucks detecting on the hole.Satisfying stop sleeve center line and electric pole intersect vertical axis, and stop sleeve insert to detect under the rational situation of length adjustment in hole, just can guarantee flexible hose by the sagging endoscope probe center line afterwards of stop sleeve just in time drop on electric pole dead in line position on.
Length mark is carved with in outside at flexible hose, and the folding and unfolding flexible hose can make endoscope probe do vertical direction displacement up and down along the axis of electric pole, can be in the height and position of underground foundation embedded section by the control of the scale on it endoscope probe.
On the other hand, the invention provides a kind of crack defects of inner surface of underground foundation embedded section of electric pole lossless detection method, may further comprise the steps:
1) stop sleeve is inserted the detection hole of electric pole to be measured, and make it well secured;
2) flexible hose that endoscope probe will be housed by described stop sleeve is put into electric pole, makes described endoscope probe be in suspended state;
3) the insertion length of the described stop sleeve of adjustment makes the dead in line of the center line and the electric pole of described endoscope probe;
4) open the endoscope probe light source, regulate peripheral control unit, a certain height of endoscope probe is along the circumferential direction rotated along the electric pole inside surface, focus, make video monitor obtain inside surface image clearly;
5) the described flexible hose of folding and unfolding, vertical direction moves to make endoscope probe do up and down along the electric pole axis, and it is moved to the initial detection position of underground foundation embedded section of electric pole;
6) regulating peripheral control unit makes endoscope probe along the circumferential direction rotate along the electric pole inside surface, each regulated quantity of rotating just in time makes between the video image of collection and is connected mutually, endoscope probe rotates a circle, and just collects the video image of an endless belt of electric pole inside surface;
7) continue the folding and unfolding flexible hose, make endoscope probe move to next height and position, repeat above-mentioned steps 6), gather the electric pole inside surface video image of this height, and observe the defect state judge the electric pole inside surface by video monitor, in like manner, judge until video image acquisition and the defect state finished on all height of underground foundation embedded section;
8) in testing process, if when finding that crack defect or crack size are big, record and storage defect position and image compare with demarcation and the 0.2mm standard crackle video image that is stored in the computing machine, just can judge whether crackle exceeds standard.
When detecting, a folding and unfolding of flexible hose distance should make endoscope probe be connected mutually at the image of adjacent height collection, general about 50～100mm.
Crackle exceed standard resolution principle be with " aerial power transmission line operating standard " (DL/T741-2001) in the 0.2mm width crackle of regulation be standard, judge that whether crackle to be measured surpasses this standard.Generally exceeding standard needs according to underground foundation embedded section of electric pole structure to be measured before detecting, and gathers the video image of 0.2mm standard crackle in the laboratory, promptly demarcates.In electric pole crack defect testing process, if discovery crack defect or crack size are bigger, need carry out crackle and exceed standard when diagnosing, this crackle video image is gathered in the recording defect position, and the video image comparison with above-mentioned standard crackle can judge whether to exceed standard.Standard crackle video image can be stored in the computing machine in advance and call at any time, the on-the-spot crackle of judgement fast state.
The scaling method of standard crackle: two kinds on straight (shape) bar of Circular reinforced concrete pole branch and awl (shape) bar, demarcation is that planform according to underground foundation embedded section of electric pole to be measured is at one section demarcation test specimen identical with it of making in laboratory, as the standard crackle, utilize the video image that detects identical instrument, parameter and method collection standard crackle with on-the-spot electric pole to be measured in the ARTIFICIAL CRACK of the prefabricated 0.2mm of test specimen inside surface then.Concerning straight-bar, endoscope probe is in the electric pole axial location during detection, endoscope probe all equates at arbitrary height apart from the distance of inside surface, the endoscope probe focal length remains unchanged during detection, therefore, demarcate a standard crackle video image that needs to gather a kind of state as exceeding standard criterion, can before detection, finish demarcation, be stored in the computing machine standby.Concerning the awl bar, because underground buried depth section pole diameter changes, obtain the output video image of identical sharpness during detection as if need, the endoscope probe focal length must be regulated with vary in diameter, demarcate to need gathers apart from endoscope probe at the standard crackle video image of differing heights under the inside surface different distance state.
The present invention has the following advantages:
1, lossless detection method, having solved China does not have the problem of detection method to moving the inner surface of underground foundation embedded section of electric pole defective at present;
2, video image output has solved the people and can't enter electric pole inside, can't intuitively observe the problem of defect in inner surface, has realized the quick judgement that crack defect detects and whether crackle exceeds standard;
3, detection method is easy and simple to handle, need not to dismantle electric pole, need not preparation of construction, not influenced by field environment.When using at the scene, directly endoscopic system is connected, endoscope probe is inserted into electric pole inside by detecting the hole, energized can detect, and does not influence electric power netting safe running.
4, detection method of the present invention is applied to will save great amount of manpower and material resources and financial resources in the safety inspection of electrical network electric pole, significantly improves economic benefit of enterprises and social benefit.
Description of drawings
Fig. 1 is the synoptic diagram of crack defects of inner surface of underground foundation embedded section of electric pole the cannot-harm-detection device, the state when showing this device work.
Fig. 2 is the enlarged diagram of stop sleeve structure of the pick-up unit of a kind of preferred embodiment according to the present invention.
Fig. 3 is the enlarged diagram of the stop sleeve structure of the pick-up unit of another kind of preferred embodiment according to the present invention, is provided with draw ring on ring flange.
Fig. 4 is the composition synoptic diagram of endoscopic system.
Description of reference numerals is as follows:
1. electric pole
2. inner surface of underground foundation embedded section of electric pole
3. endoscopic system
4. detection hole
5. stop sleeve
6. endoscope probe
7. ring flange
8. magnetic rubber
9. draw ring
10. signal wire
11. flexible hose
12. peripheral control unit
13. video monitor
14. connector
15. computing machine
16. object lens
17. light source
18.CCD camera
Embodiment
Below in conjunction with accompanying drawing crack defects of inner surface of underground foundation embedded section of electric pole the cannot-harm-detection device of the present invention and method are done and to be illustrated in greater detail.
Referring to Fig. 1 and 4, crack defects of inner surface of underground foundation embedded section of electric pole the cannot-harm-detection device of the present invention is made up of stop sleeve 5 and endoscopic system 3.Endoscopic system 3 is made up of endoscope probe 6, signal wire 10, flexible hose 11, peripheral control unit 12, video monitor 13, connector 14 and computing machine 15, endoscope probe 6 is made up of object lens 16, light source 17 and CCD camera 18, and flexible hose 11 links to each other with computing machine 15 with external power source by connector 14.
Referring to Fig. 2, stop sleeve 5 is a cylindrical tubular shape, has a ring flange 7 in the outer end of stop sleeve 5, is being positioned at the inner end design circular arc chamfering of electric pole.The outside surface of stop sleeve 5 with detect hole 4 in the section of cooperation of steel pipe partly process annular shallow slot, and in shallow slot the magnetic rubber 8 of bonding suitable thickness, make stop sleeve 5 contact and suck fixing with detection hole 4.
Referring to Fig. 3, can on ring flange 7, design a draw ring 9, so that take out the stop sleeve 5 that sucks in detecting hole 4.
The method that detects with the present invention is as follows:
Referring to Fig. 1, before the detection, at first connect each ingredient of endoscopic system 3, and guarantee that their functions are normal, endoscope probe 6 moves up and down flexibly.Then stop sleeve 5 is inserted and detect in the hole 4, by ring flange 7 magnetic rubber on the stop sleeve 5 is advanced for 8 sections and detect in the hole 4.Flexible hose 11 that endoscope probe 6 is housed is put into electric pole 1 underground foundation embedded section to be measured by stop sleeve 5, make endoscope probe 6 be in suspended state.Flexible hose 11 contacts with stop sleeve 5, and folding and unfolding flexible hose 11 can make endoscope probe 6 do vertical direction displacement up and down along electric pole 1 axis.Be carved with length mark in flexible hose 11 outsides, be in the height and position of underground foundation embedded section by the control of the scale on it endoscope probe 6.Open light source 17, illuminate the electric pole inner surface area that endoscope probe 6 is aimed at, fixed endoscope probe 6 is in this height and position, regulating peripheral control unit 12 makes endoscope probe 6 along the circumferential direction rotate along the electric pole inside surface, observe the image of video monitor 13, by focusing and adjusting stop sleeve 5, it is all clear equally that the images of acquisition is determined under the focal length at certain.At this moment, illustrate that endoscope probe 6 center lines overlap with electric pole 1 axis, keep endoscope probe 6 focal lengths in that to connect testing process constant.Install and fix stop sleeve 5, guaranteed stop sleeve 5 does not produce any direction in measuring process motion.
Detect beginning, folding and unfolding flexible hose 11 moves to endoscope probe 6 the starting altitude position of electric pole 1 underground foundation embedded section, open light source 17 and illuminate inner surface of underground foundation embedded section 2, object lens 16 are with inside surface state imaging (optical imagery), by CCD camera 18 pickup images (electric signal), be sent to video monitor 13 by signal wire 10 again and directly show, observe for the testing staff.Regulate peripheral control unit 12 endoscope probe 6 is along the circumferential direction rotated along the electric pole inside surface at sustained height, observe the inside surface state of annular band region.The each regulated quantitys of rotating endoscope probes 6 of peripheral control unit 12 just in time make between two width of cloth video images of collection and are connected mutually, like this, endoscope probe 6 orders rotate a circle, just collected the video image in the electric pole 1 inside surface certain width endless belt, observed by video monitor 13 and just can judge the crack defects of inner surface state that is in this endless belt fast.Folding and unfolding flexible hose 11 makes endoscope probe 6 move to next height and position, repeats the aforesaid operations step, gathers the image of this height and observes the defect in inner surface state of judging by video monitor 13.In like manner, judge until video image acquisition and the defect state finished on all height of underground foundation embedded section.
In testing process, if when finding that crack defect or crack size are big, by computing machine 15 record and storage defect position and images, compare with the 0.2mm standard crackle video image of demarcating and being stored in the computing machine in the laboratory under the same testing conditions, just can judge whether crackle exceeds standard.
Detection finishes, and flexible hose 11 is pulled out from electric pole inside, and by draw ring 9 stop sleeve 5 is taken out from detect hole 4.
Although with instantiation crack defects of inner surface of underground foundation embedded section of electric pole the cannot-harm-detection device of the present invention and method were illustrated in conjunction with the accompanying drawings already, it will be understood by those skilled in the art that, disclosed concrete scheme is illustrative, rather than determinate.Under the prerequisite of principle disclosed and design without prejudice to the present invention, can carry out various changes and distortion to such scheme, such change all belongs to the scope of protection of present invention defined in claims.
Claims (8)
1. crack defects of inner surface of underground foundation embedded section of electric pole the cannot-harm-detection device, its feature is made up of stop sleeve (5) and endoscopic system (3) in this device.
2. crack defects of inner surface of underground foundation embedded section of electric pole the cannot-harm-detection device as claimed in claim 1, its feature is made up of endoscope probe (6), signal wire (10), flexible hose (11), peripheral control unit (12), video monitor (13), connector (14) and computing machine (15) in described endoscopic system (3), endoscope probe (6) is made up of object lens (16), light source (17) and CCD camera (18), and flexible hose (11) links to each other with computing machine (15) with external power source by connector (14).
3. crack defects of inner surface of underground foundation embedded section of electric pole the cannot-harm-detection device as claimed in claim 1, its feature is a cylindrical tubular shape in described stop sleeve (5), has a ring flange (7) in the outer end of stop sleeve (5).
4. crack defects of inner surface of underground foundation embedded section of electric pole the cannot-harm-detection device as claimed in claim 1, its feature in the outside surface of described stop sleeve (5) with detect the hole in the section of cooperation of steel pipe partly have annular shallow slot, and the magnetic rubber (8) that in shallow slot, bonds.
5. as crack defects of inner surface of underground foundation embedded section of electric pole the cannot-harm-detection device any among the claim 1-4, its feature is in having a draw ring (9), so that take out the described stop sleeve (5) that sucks detecting on the hole on described ring flange (7).
6. crack defects of inner surface of underground foundation embedded section of electric pole the cannot-harm-detection device as claimed in claim 5, its feature is in the inner end design circular arc chamfering that is positioned at electric pole at described stop sleeve (5).
7. crack defects of inner surface of underground foundation embedded section of electric pole the cannot-harm-detection device as claimed in claim 2, its feature is in being carved with length mark in described flexible hose (11) outside.
8. method of utilizing crack defects of inner surface of underground foundation embedded section of electric pole the cannot-harm-detection device any one among the claim 1-7 to detect crack defects of inner surface of underground foundation embedded section of electric pole may further comprise the steps:
1) stop sleeve (5) is inserted the detection hole (4) of electric pole (1), and make it well secured;
2) flexible hose (11) that endoscope probe (6) will be housed by described stop sleeve (5) is put into electric pole (1), makes described endoscope probe (6) be in suspended state;
3) adjust the insertion length of described stop sleeve (5), make the dead in line of the center line and the electric pole (1) of described endoscope probe (6);
4) open endoscope probe light source (17), regulate peripheral control unit (12), endoscope probe (6) is along the circumferential direction rotated along the electric pole inside surface at sustained height, focus, make video monitor (13) obtain inside surface video image clearly;
5) the described flexible hose of folding and unfolding (11), vertical direction moves to make endoscope probe (6) do up and down along the electric pole axis, and it is moved to the initial detection position of electric pole (1) underground foundation embedded section;
6) regulate peripheral control unit (12), endoscope probe (6) is along the circumferential direction rotated along the electric pole inside surface at sustained height, each regulated quantity of rotating just in time makes between the video image of collection and is connected mutually, endoscope probe (6) rotates a circle, and just collects the video image of (2) endless belts of electric pole inside surface;
7) continue folding and unfolding flexible hose (11), make endoscope probe (6) move to next height and position, repeat above-mentioned steps 6), gather the electric pole inside surface video image of this height, and observe the defect state judge electric pole inside surface (2) by video monitor (13), in like manner, judge until video image acquisition and the defect state finished on all height of underground foundation embedded section;
8) in testing process, if when finding that crack defect or crack size are big, record and storage defect position and image compare with the video image of demarcating and be stored in the 0.2mm standard crackle in the computing machine (15) under same testing conditions, judge whether crackle exceeds standard.
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| CN2009101702890A CN101650318B (en) | 2009-09-10 | 2009-09-10 | Nondestructive examination device and method of crack defects of inner surface of underground foundation embedded section of electric pole |
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| CN2009101702890A CN101650318B (en) | 2009-09-10 | 2009-09-10 | Nondestructive examination device and method of crack defects of inner surface of underground foundation embedded section of electric pole |
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| CN101650318B CN101650318B (en) | 2011-06-22 |
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