CN205484204U - Compound monitoring devices of suspension cable corrosion based on stress concentration and supersound guided wave - Google Patents
Compound monitoring devices of suspension cable corrosion based on stress concentration and supersound guided wave Download PDFInfo
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- CN205484204U CN205484204U CN201620046022.6U CN201620046022U CN205484204U CN 205484204 U CN205484204 U CN 205484204U CN 201620046022 U CN201620046022 U CN 201620046022U CN 205484204 U CN205484204 U CN 205484204U
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Abstract
The utility model relates to a compound monitoring devices of suspension cable corrosion based on stress concentration and supersound guided wave, including a plurality of corrosion sensing units to will a plurality of affiliated corrosion sensing units and a supplementary frame attach formation prestressing force self -balancing system, in steel wire thin slice steel wire or initial corrosion time of steel strand wires and through the degree of depth of corresponding program calculation corrosion degree with rusting rate or emergence season crack in the suspension cable is not judged to the measurement station monitoring data of meeting an emergency in succession laid of co -altitude department, analysis supersound guided wave signal characteristics changes the initial corrosion time of steel wire or steel strand wires of judging, compare the poor rate of change of the different amplitudes of guided wave signal constantly, judge the rusting rate of steel wire thin slice. The corrosion of this device regional steel wire of anchor head under to suspension cable free section is gone on for a long time with the stress corrosion state, quantitative monitoring or periodic detection, and does not destroy local microenvironment, and a plurality of corrosion sensing units are arranged in this region simultaneously, the further authenticity and the reliability of monitoring guaranteed.
Description
Technical field
This utility model relates to civil engineering structure health, bridge cable structure durability monitoring technical field, especially relates to concentrate the suspension cable corrosion combined monitoring device with supersonic guide-wave based on stress, is applied to the monitoring of bridge cable structure erosion.
Background technology
Bridge cable Damage of Corroded is relevant with the safeguard procedures of cable.The most commonly used hot extrusion high density polyethylene (HDPE) (HDPE) sheath protects, cable body is made up of parallel steel wire or parallel steel stranded wire, the detection of line structure Damage of Corroded has with monitoring method: (1) manual method: mainly check whether cable system suffers corrosion, whether each securing member loosens, and whether cable body has breakage.Advantage is can macroscopic examination qualitatively；Shortcoming is check fee manpower and materials, and examination scope is limited and testing result can only be used to qualitative evaluation, and difficulty meets quantitative assessment requirement, cannot realize sudden accident detecting in time and monitoring.(2) ultrasonic method: be mainly used to detect parallel steel wire face crack, rust hole, but owing to cable is made up of many parallel steel wires or steel strand wires, cross sectional shape is complicated, Damage of Corroded position is uncertain, ultrasound wave is only capable of detecting surface defect, in addition, anchor head position is complex-shaped, and ultrasound examination exists bigger blind area.(3) lonizing radiation method: can detect cable internal injury and defect, can accurately obtain the corrosion within cable body cable body and fracture of wire equivalent damage, and shortcoming is to shield the radiation to human body, and x-ray apparatus is the biggest, is not suitable for monitoring in real time.(4) electrochemical method: electrochemical method is mainly for single steel bar or steel strand wires, its Detection results of cable forming many parallel steel wires or steel strand wires is not good enough, the most present assessment method is substantially the probability of the corrosion judging cable according to the scope of potential difference, but impact such as tested person regional area environmental factors such as temperature, humidity etc. is notable.(5) supersonic guide-wave method: the most domestic also have research monitoring steel bar corrosion method based on ultrasonic guided wave technique, but the method is the reinforcing bar for full-scale length, it it is not a kind of product sensor, when in concrete, there is guided wave signals leakage, the weak point that guided wave signals that sensor receives is faint and complicated, it is difficult to be applied in Practical Project.It addition, reinforcing bar is solid cylinder, the guided wave propagated in reinforcing bar is in available frequency range mode the most (up to more than ten mode), and signal can be more complicated.
Utility model content
The purpose of this utility model is to solve cast anchor head region corrosion state and stress corrosion cracking (SCC) of stay cable of cable-stayed bridge free segment to monitor in real time and periodic detection demand, improve the reliability of bridge cable corrosion and stress corrosion cracking (SCC) monitoring, it is achieved to high tensile steel wire in bridge cable structure or steel strand wires initial corrosion time, corrosion degree and the prison of stress corrosion cracking (SCC), detection and early warning.
In order to realize the purpose of this utility model, proposition techniques below scheme:
A kind of suspension cable corrosion combined monitoring device based on stress concentration with supersonic guide-wave, described combined monitoring device 1 includes corrosion sensing unit 9 and auxiliary frame, described corrosion sensing unit 9 is by intercepting the steel wire of certain length and cutting into thin slice and formed, strain measuring point 15 continuously is set at the differing heights of steel wire thin slice two sides, described continuous strain measuring point 15 uses chain type foil gauge group, arranges measurement sheet in each chain type foil gauge group；
Described auxiliary frame includes that fixed cross beam 10, column 11, pre-load nut 12, moving beam 13 and pier nose 14, described fixed cross beam 10, column 11 and moving beam 13 constitute a framework, and wherein, moving beam 13 slides along fixed cross beam 10；
Described corrosion sensing unit 9 is through fixed cross beam 10 and moving beam 13, two ends are fixed by pier nose 14, described pre-load nut 12 applies initial strain by mobile moving beam 13 to multiple corrosion sensing units 9, steel wire slice-shaped in the middle part of corrosion sensing unit 9 is made to become plane stress state, measurement sheet on described corrosion sensing unit 9 is connected with deformeter, the mean strain of each measuring point on monitoring length direction continuously；
Piezoelectric ceramic piece 16 is pasted in described steel wire foil end both sides, side piezoelectric ceramic piece 16 is as driver, apply high-frequency narrow-band pulse voltage, produce the guided wave propagated vertically to propagate in steel wire thin slice, opposite side piezoelectric ceramic piece 16 is as sensor, receive the guided wave that steel wire thin slice transmits, judge steel wire thin slice corrosion and stress corrosion cracking (SCC) state according to guided wave signals feature.
Described corrosion sensing unit 9 choose with suspension cable used by with trade mark high tensile steel wire.
Multiple measurement sheet and 1 temperature-compensating sheet for temperature-compensating is had in described each chain type foil gauge group.
Described corrosion sensing unit 9 uses polyester material protective jacket 18 to encapsulate three surfaces of corrosion sensing unit steel wire thin slice, retains an end face as corrosion monitoring face 17.
In described polyester material protective jacket 18, there is anticorrosive coat 19.
Described fixed cross beam 10 and moving beam 13 are annular girder, and described moving beam 13 and corrosion sensing unit 9 are spaced on annular girder and are symmetrical arranged, and suspension cable high tensile steel wire 4 passes in the middle of annular girder.
Effect of the present utility model is: realize monitoring the corrosion of steel wire in stay cable of cable-stayed bridge anchor head position and free segment with stress corrosion cracking (SCC), corrosion sensing unit steel wire thin slice is consistent with actual cable stress and corrosion condition, in the middle part of corrosion sensing unit, steel wire thin slice is in plane stress state, locally form stress concentration after corrosion or stress corrosion, show that according to cross section differing heights the strain variation of strain measuring point continuously realizes cable anchor head position and high tensile steel wire or the initial corrosion time of steel strand wires in free segment with ultrasonic guided wave signals and amplitude change thereof, corrosion degree is monitored or periodic detection in real time with stress corrosion cracking (SCC).Under conditions of not destroying local microenvironment, it is ensured that corrosion and the verity of stress corrosion cracking (SCC) monitoring and reliability.The most multiple corrosion sensing units are arranged in this region, improve the reliability of cable corrosion monitoring further.
Accompanying drawing explanation
Fig. 1 suspension cable corrosion monitoring device arranges schematic diagram；
Fig. 2 corrosion monitoring device schematic diagram；
Fig. 3 corrosion monitoring device side view；
Fig. 4 a corrosion sensing unit side view；
Fig. 4 b corrosion sensing unit top view
Point layout schematic diagram is strained on Fig. 5 corrosion sensing unit.
Wherein
1-corrosion monitoring device, 2-high density polyethylene (HDPE) sheath, 3-casing, 4-high tensile steel wire, 5-anchor backing plate, 6-anchor circle, 7-anchor cup, 8-bonnet, 9-corrosion sensing unit, 10-fixed cross beam, 11-column, 12-pre-load nut, 13-moving beam, 14-pier nose, 15-strain measuring point, 16-piezoelectric ceramic piece, 17-corrosion monitoring face, 18-polyester material protective jacket, 19-anticorrosive coat.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with the drawings and specific embodiments, this utility model is further described.
Fig. 1 suspension cable corrosion monitoring device arranges schematic diagram, as it can be seen, multiple corrosion sensing units 9 are fixed on outside cable high tensile steel wire 4 by two ends ring device by this utility model, inside casing 3 or high density polyethylene (HDPE) sheath 2.Cable high tensile steel wire 4 passes in the middle of ring device.Corrosion sensing unit is in plane stress state by structure steel wire thin slice, concentrated by the stress that strain measuring point perception corrosion or stress corrosion cracking (SCC) cause continuously, and by pasting piezoelectric ceramic piece on steel wire thin slice, side piezoelectric ceramic piece is as driver, apply high-frequency narrow-band pulse voltage, produce the guided wave propagated vertically to propagate in steel wire thin slice, other side piezoelectric patches is as sensor, receive the guided wave transmitted from steel wire thin slice, judge steel wire thin slice corrosion and stress corrosion cracking (SCC) state according to guided wave signals feature.Two kinds of monitoring methods are combined with each other, arrange multiple corrosion sensing units in a region simultaneously, improve the reliability of bridge cable corrosion and stress corrosion cracking (SCC) monitoring, it is achieved to high tensile steel wire in bridge cable structure or steel strand wires initial corrosion time, corrosion degree and the prison of stress corrosion cracking (SCC), detection and early warning.
Embodiment: choose with suspension cable used by with trade mark high tensile steel wire, intercept certain length and cut thin slice formation corrosion sensing unit 9 (such as Fig. 4 a, shown in b), strain measuring point 15 is set continuously at the differing heights of two sides (such as Fig. 4 a, Fig. 5), strain measuring point 15 uses chain type foil gauge group continuously, multiple measurement sheet is had in each chain type foil gauge group, 1 temperature-compensating sheet is for temperature-compensating (straining after hereafter monitoring strain is compensation), it is pasted onto at the different cross section height of thin slice both sides by high-performance glue, pass through solder terminal, wire is connected with deformeter, chain type foil gauge group can monitor the mean strain of each measuring point on length direction continuously.Piezoelectric ceramic piece 16 is pasted at steel wire foil end, side piezoelectric ceramic piece 16, as driver, applies high-frequency narrow-band pulse voltage, produces the guided wave propagated vertically and propagates in steel wire thin slice, opposite side piezoelectric ceramic piece 16, as sensor, receives the guided wave that steel wire thin slice transmits.Polyester material protective jacket 18 is used to encapsulate its three surfaces, only retain an end face as corrosion monitoring face 17 (as shown in Figure 5), it is thusly-formed a corrosion sensing unit 9, by multiple corrosion sensing units 9 through fixed cross beam 10 and moving beam 13, corrosion sensing unit two ends make pier nose 14, by pre-load nut 12, multiple corrosion sensing units 9 are applied initial strain, by strain measuring point monitoring actual loaded stress continuously, make middle part steel wire thin slice stress identical with the dead-load stress of steel wire in institute monitoring cable or steel strand wires, in the middle part of corrosion sensing unit 9, steel wire slice-shaped becomes plane stress state, during rope processed, corrosion monitoring device 1 is laid in position as shown in Figure 1.
During bridge cable is on active service, once there is local corrosion in corrosion monitoring face 17, this corrosion region is partially formed stress and concentrates, local train is undergone mutation, chain type foil gauge group near this position and this region common eigenvector, therefore strain signal is undergone mutation, and strain variation is different on different cross section height, the biggest the closer to the strain variation of corrosion or stress corrosion region, same depth of section does not occurs the strain variation at corrosion or stress corrosion position the least, corresponding calculation procedure can be used to calculate in cable the steel wire initial corrosion time according to straining the change of measuring point Monitoring Data at steel wire thin slice differing heights continuously, corrosion degree and stress corrosion state.
Side piezoelectric ceramic piece 16 is as driver simultaneously, applies high-frequency narrow-band pulse voltage, produces the guided wave propagated vertically and propagates in steel wire thin slice, and opposite side piezoelectric ceramic piece 16, as sensor, receives the guided wave that steel wire thin slice transmits.The ultrasonic guided wave signals feature that corrosion sensing unit 9 steel wire thin slice corrosion or stress corrosion cracking (SCC) cause Piezoelectric Ceramics Excitation to produce changes, the time of origin of the difference in magnitude of the guided wave signals recorded before and after analyzing steel wire thin slice corrosion, can determine whether out the initial corrosion time of steel wire thin slice, analyze the rate of change of guided wave signals difference in magnitude the most in the same time, can determine whether out the rusting rate of steel wire thin slice, analyze guided wave signals difference in magnitude and compare with result of the test, it can be determined that the corrosion degree of steel wire thin slice or the stress corrosion cracking (SCC) degree of depth.
Strain measuring point strain variation can monitor corrosion and stress corrosion with ultrasonic guided wave signals simultaneously continuously, improves the reliability of cable steel wire corrosion and stress corrosion cracking (SCC) monitoring.Multiple corrosion sensing unit 9 is set in corrosion monitoring device 1, can further improve corrosion monitoring device 1 and lay reliability and the accuracy of cable steel wire corrosion monitoring in region.
Particular embodiments described above; the purpose of this utility model, technical scheme and beneficial effect have carried out entering the detailed description of 1 step; it is it should be understood that; the foregoing is only specific embodiment of the utility model; it is not limited to this utility model; all within spirit of the present utility model and principle, any modification, equivalent substitution and improvement etc. done, within should be included in protection domain of the present utility model.
Claims (6)
1. concentrate and the suspension cable corrosion combined monitoring device of supersonic guide-wave based on stress for one kind, it is characterized in that: described combined monitoring device (1) includes corrosion sensing unit (9) and auxiliary frame, described corrosion sensing unit (9) is by intercepting the steel wire of certain length and cutting into thin slice and formed, arrange at the differing heights of steel wire thin slice two sides and strain measuring point (15) continuously, described continuous strain measuring point (15) uses chain type foil gauge group, arranges measurement sheet in each chain type foil gauge group；
Described auxiliary frame includes fixed cross beam (10), column (11), pre-load nut (12), moving beam (13) and pier nose (14), described fixed cross beam (10), column (11) and moving beam (13) constitute a framework, wherein, moving beam (13) slides along fixed cross beam (10)；
Described corrosion sensing unit (9) passes fixed cross beam (10) and moving beam (13), two ends are fixed by pier nose (14), described pre-load nut (12) applies initial strain by mobile moving beam (13) to multiple corrosion sensing units (9), corrosion sensing unit (9) middle part steel wire slice-shaped is made to become plane stress state, measurement sheet on described corrosion sensing unit (9) is connected with deformeter, the mean strain of each measuring point on monitoring length direction continuously；
Piezoelectric ceramic piece (16) is pasted in described steel wire foil end both sides, side piezoelectric ceramic piece (16) is as driver, apply high-frequency narrow-band pulse voltage, produce the guided wave propagated vertically to propagate in steel wire thin slice, opposite side piezoelectric ceramic piece (16) is as sensor, receive the guided wave that steel wire thin slice transmits, judge steel wire thin slice corrosion and stress corrosion cracking (SCC) state according to guided wave signals feature.
Suspension cable corrosion combined monitoring device the most according to claim 1, it is characterised in that described corrosion sensing unit (9) choose with suspension cable used by with the high tensile steel wire of the trade mark.
Suspension cable corrosion combined monitoring device the most according to claim 2, it is characterised in that have multiple measurement sheet and 1 temperature-compensating sheet for temperature-compensating in described each chain type foil gauge group.
Suspension cable corrosion combined monitoring device the most according to claim 3, it is characterized in that, described corrosion sensing unit (9) uses three surfaces of polyester material protective jacket (18) encapsulation corrosion sensing unit steel wire thin slice, retains an end face as corrosion monitoring face (17).
Suspension cable corrosion combined monitoring device the most according to claim 4, it is characterised in that in described polyester material protective jacket (18), there is anticorrosive coat (19).
Suspension cable corrosion combined monitoring device the most according to claim 5, it is characterized in that, described fixed cross beam (10) and moving beam (13) are annular girder, described moving beam (13) and corrosion sensing unit (9) are spaced on annular girder and are symmetrical arranged, and suspension cable high tensile steel wire (4) passes in the middle of annular girder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620046022.6U CN205484204U (en) | 2016-01-18 | 2016-01-18 | Compound monitoring devices of suspension cable corrosion based on stress concentration and supersound guided wave |
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| CN201620046022.6U CN205484204U (en) | 2016-01-18 | 2016-01-18 | Compound monitoring devices of suspension cable corrosion based on stress concentration and supersound guided wave |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108872319A (en) * | 2018-03-27 | 2018-11-23 | 哈尔滨工业大学深圳研究生院 | A kind of corrosion sensor |
| CN111751269A (en) * | 2020-07-17 | 2020-10-09 | 广西交科集团有限公司 | Inhaul cable corrosion monitoring sensor, monitoring equipment and monitoring method |
-
2016
- 2016-01-18 CN CN201620046022.6U patent/CN205484204U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108872319A (en) * | 2018-03-27 | 2018-11-23 | 哈尔滨工业大学深圳研究生院 | A kind of corrosion sensor |
| CN111751269A (en) * | 2020-07-17 | 2020-10-09 | 广西交科集团有限公司 | Inhaul cable corrosion monitoring sensor, monitoring equipment and monitoring method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160817 Termination date: 20200118 |
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| CF01 | Termination of patent right due to non-payment of annual fee |