CN103048379A - Device and method for recognizing damage to bridge stay cable - Google Patents
Device and method for recognizing damage to bridge stay cable Download PDFInfo
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- CN103048379A CN103048379A CN201310012111XA CN201310012111A CN103048379A CN 103048379 A CN103048379 A CN 103048379A CN 201310012111X A CN201310012111X A CN 201310012111XA CN 201310012111 A CN201310012111 A CN 201310012111A CN 103048379 A CN103048379 A CN 103048379A
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Abstract
The invention discloses a device and a method for recognizing damage to a bridge stay cable. The device comprises an iron plate, two magnets and a signal analyzer, wherein a copper coil is fixedly arranged on the bottom surface of the iron plate; the two magnets are arranged on the bottom surface of the iron plate at an interval; the copper coil is located at the center of the connection line between the two magnets; and the signal analyzer is used for real-timely collecting and displaying magnetic flux of the copper coil. The invention provides an optimized structure scheme for detecting damage to the bridge stray cable according to a magnetic flux leakage detection principle. The device provided by the invention is simple in structure, convenient and easy to operate and carry, and can improve the magnetic flux leakage detection sensitivity by replacing the conventional Hall sensor by the coil, thereby facilitating signal amplification and subsequent analysis.
Description
Technical field
The present invention relates to the cannot-harm-detection device, be specifically related to bridge stay cable damage recognition device and method.
Background technology
Cable-stayed bridge has the span ability larger than beam bridge, is one of most popular bridge type of China's Longspan Bridge, builds so far various types of cable-stayed bridge hundreds of seats, becomes to have the maximum country of cable-stayed bridge.
Suspension cable is the main supporting part of cable-stayed bridge, is in very crucial and position core, and its cost accounts for 1/4th to 1/3rd of full-bridge cost.In the long-term operation process of cable-stayed bridge, because overload, tired, external jacket is damaged etc., and a variety of causes causes suspension cable producing in varying degrees fracture of wire, corrosion equivalent damage, wherein the main forms of damage is exactly the change of drag-line cross-sectional area, this inherent vice and damage as untimely discovery, will cause catastrophic failure in case run up to a certain degree, cause an immeasurable loss for the people's safety of life and property.But drag-line is in high empty position, and external jacket is arranged again, and its internal injury is difficult to observed and finds.
For this reason, Chinese invention patent CN1405558 discloses a kind of " Magnectic-conductive member end-part defect detection device ", comprise test section and signal processing, test section magnetizing apparatus two magnetic poles, detection probe and secondary guide are positioned on the axis, detection probe is the two-stage compressing structure of circumferential subdivision, first order compressing structure comprises housing, stage clip, briquetting, and second level compressing structure comprises torsion spring, surveys Hall element and the poly-magnetic sheet of body and end thereof.This scheme has proposed to utilize Hall element and poly-magnetic sheet to detect conducting magnetic component end defective, for the conducting magnetic component damage check provides good thinking.But this patent mainly is for members such as oil pipe, drilling rods, and structure is too complicated heavy, is not suitable for being applied on the bridge stay cable.And its signal of the Hall element that adopts amplifies in inside, and insufficient sensitivity is high, is unfavorable for detecting the exigent fine defects of some sensitivity and the later stage signal is processed.
In addition, Chinese invention patent CN102269734A discloses a kind of " the long-pending loss detection method of ferromagnetism cable cross section metal and device thereof ", the cable winding that will be connected with direct supply on measured cable as the dc magnetization coil, along cable circumferential directions armature group and magneto sensor; Open direct supply, cable will be magnetized by dc coil, and form magnetic loop with the armature group, be placed on magneto sensor in this magnetic loop can measuring circuit in the magnetic induction density value, and with the formal output of voltage; By the change in voltage that the magneto sensor that relatively inserts the standard sample front and back is exported, obtain measurement coefficient, thereby realize the detection of the long-pending loss of cable cross section metal.But have in this scheme with galvanic cable winding on measured cable, when whole cable is detected this system suspension cable mobile get up just very inconvenient.This scheme is very large to the power demand of electric energy, adopts the mode meeting of wired power supply so that whole suspension cable detection is very loaded down with trivial details, if adopt the same meeting of powered battery so that whole pick-up unit is very heavy, has lost the little lightweight meaning of the volume of structure own.
In sum, existing bridge stay cable damage recognition device complex structure is heavy, uses inconvenience.
Summary of the invention
Technical matters to be solved by this invention is the problem that solves bridge stay cable damage recognition device complex structure heaviness.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention provides a kind of bridge stay cable damage recognition device, comprise iron plate, two blocks of magnet and signal analyzer, be fixed with a copper coil on the bottom surface of described iron plate, two blocks of described magnet are disposed on the bottom surface of described iron plate, and described copper coil is positioned at the line center of described two blocks of magnet, and described signal analyzer Real-time Collection also shows the magnetic flux of described copper coil.
In such scheme, the centre distance of two blocks of described magnet is 80mm.
In such scheme, the wire diameter of described copper coil is 4mm, and the number of turns is 5～20.
In such scheme, the profile of described magnet is disc-shaped, and diameter is 40mm, and thickness is 8mm.
In such scheme, described signal analyzer is converted to the voltage demonstration with the magnetic flux of described copper coil.
The present invention also provides a kind of bridge stay cable damnification recognition method, may further comprise the steps:
Signalization harvester on the pe sheath of suspension cable, copper coil of described signal pickup assembly tool;
The driving signal harvester slides along the axis direction of pe sheath, and judges according to the magnetic flux change of described copper coil whether suspension cable inside has damage.
In said method, described signal pickup assembly comprises iron plate and two blocks of magnet, and described copper coil is fixed on the bottom surface of described base plate; Two blocks of magnet are disposed on the bottom surface of described iron plate, and described copper coil is positioned at the line center of described two blocks of magnet; Described signal pickup assembly passes through the magnetic-adsorption of two blocks of described magnet on the pe sheath of suspension cable.
The present invention provides the prioritization scheme of bridge stay cable damage check according to the Magnetic Flux Leakage Inspecting principle, and this apparatus structure is simply light, easy operating and carrying, changing traditional Hall element is coil, can improve the sensitivity to Magnetic Flux Leakage Inspecting, is more convenient for signal is amplified and subsequent analysis.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is vertical view of the present invention;
Fig. 3 is the demonstration result schematic diagram of signal analyzer among the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is made detailed explanation.
As shown in Figure 1 and Figure 2, bridge stay cable provided by the invention damage recognition device comprises iron plate 1, two blocks of magnet 2 and signal analyzer 5.
Be fixed with a copper coil 3 on the bottom surface of iron plate 1, two blocks of magnet 2 are disposed on the bottom surface of iron plate 1, and copper coil 3 is positioned at the line center of two blocks of magnet 2, iron plate 1, two blocks of magnet 2 and copper coil 3 form signal pickup assemblies, copper coil 3 is connected to signal analyzer 5, and the magnetic flux by signal analyzer 5 Real-time Collection copper coils 3 is converted to voltage and shows.
In such scheme, iron plate 1 is of a size of 120mm * 40mm * 10mm, and the profile of magnet 2 is disc-shaped, and diameter is 40mm, and thickness is 8mm, and the centre distance of two blocks of magnet 2 is 80mm, and the wire diameter of copper coil 3 is 4mm, and the number of turns is 5～20.
Also magnet can be made the U-shaped suitable with the pe sheath profile of suspension cable, like this, mobile more convenient.
Below in conjunction with an instantiation using method of the present invention is described:
(1) utilize the magnetic force of strong magnet 2 signal pickup assembly to be fixed on the pe sheath 4 of suspension cable, the long 3m of suspension cable, naked rope diameter is 60mm, the diameter of pe sheath is 75mm, the parallel steel wire that suspension cable is 7.5mm by 45 diameters forms, and is equipped with a steel wire in the interposition of whole suspension cable and is in breaking state;
(2) copper coil 3 in the signal pickup assembly is linked to each other with signal analyzer 5;
(3) the driving signal harvester slides with the speed of 0.5m/s along the axis direction of pe sheath 4, having leakage field when the sectional area of suspension cable changes produces, magnetic flux in the copper coil 3 can change, and is converted to the voltage demonstration by signal analyzer 5.In this example, when signal pickup assembly process steel wire fracture position, signal analyzer 5 shows obvious voltage peak and occurs, and as shown in Figure 3, can conclude that this moment, there was damage the suspension cable inside of signal pickup assembly position.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structural change of making under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, all falls within protection scope of the present invention.
Claims (7)
1. bridge stay cable damage recognition device is characterized in that, comprising:
Iron plate is fixed with a copper coil on its bottom surface;
Two blocks of magnet are disposed on the bottom surface of described iron plate, and described copper coil is positioned at the line center of described two blocks of magnet;
Signal analyzer, Real-time Collection also shows the magnetic flux of described copper coil.
2. bridge stay cable damage recognition device as claimed in claim 1 is characterized in that the centre distance of two blocks of described magnet is 80mm.
3. bridge stay cable damage recognition device as claimed in claim 1 is characterized in that the wire diameter of described copper coil is 4mm, and the number of turns is 5～20.
4. bridge stay cable damage recognition device as claimed in claim 1 is characterized in that the profile of described magnet is disc-shaped, and diameter is 40mm, and thickness is 8mm.
5. bridge stay cable damage recognition device as claimed in claim 1 is characterized in that, described signal analyzer is converted to the voltage demonstration with the magnetic flux of described copper coil.
6. the bridge stay cable damnification recognition method is characterized in that, may further comprise the steps:
Signalization harvester on the pe sheath of suspension cable, copper coil of described signal pickup assembly tool;
The driving signal harvester slides along the axis direction of pe sheath, and judges according to the magnetic flux change of described copper coil whether suspension cable inside has damage.
7. bridge stay cable damnification recognition method as claimed in claim 6 is characterized in that, described signal pickup assembly comprises:
Iron plate, described copper coil are fixed on the bottom surface of described base plate;
Two blocks of magnet are disposed on the bottom surface of described iron plate, and described copper coil is positioned at the line center of described two blocks of magnet;
Described signal pickup assembly passes through the magnetic-adsorption of two blocks of described magnet on the pe sheath of suspension cable.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310012111XA CN103048379A (en) | 2013-01-11 | 2013-01-11 | Device and method for recognizing damage to bridge stay cable |
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| CN201310012111XA CN103048379A (en) | 2013-01-11 | 2013-01-11 | Device and method for recognizing damage to bridge stay cable |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122109A (en) * | 2014-08-01 | 2014-10-29 | 山西省交通科学研究院 | System for identifying rigidity damage of bridge structure |
| CN104458830A (en) * | 2014-12-29 | 2015-03-25 | 邢鹏达 | Bridge cable damage electric detecting device and detecting method |
| CN104483322A (en) * | 2014-12-11 | 2015-04-01 | 长沙理工大学 | Detection system for bridge rope |
| CN106093184A (en) * | 2016-07-08 | 2016-11-09 | 中铁大桥科学研究院有限公司 | Bridge cable electromagnetic flaw detection device and application thereof |
| CN106124610A (en) * | 2016-06-29 | 2016-11-16 | 中国海洋石油总公司 | A kind of broken strand of steel cable detection device |
| CN106814131A (en) * | 2016-12-30 | 2017-06-09 | 哈尔滨工业大学深圳研究生院 | A kind of ferromagnetic in-plane component shallow damage magnetic launches detection method and magnetic emission detection system |
| CN106968173A (en) * | 2017-04-28 | 2017-07-21 | 西南大学 | Main rope of suspension bridge corrosion monitoring system and method based on magnetic field |
| CN108982013A (en) * | 2018-08-16 | 2018-12-11 | 中铁大桥科学研究院有限公司 | For judging device, method and the calculation method of bridge rotation critical balance |
| CN109884177A (en) * | 2019-03-08 | 2019-06-14 | 重庆交通大学 | A kind of stayed structure damage position and range determining method based on magnetic memory signal |
| CN110108782A (en) * | 2019-04-18 | 2019-08-09 | 东南大学 | The leakage magnetic detection device based on magnetoresistance applied to suspension cable |
| CN110455910A (en) * | 2019-08-21 | 2019-11-15 | 西南大学 | Cable-stayed bridge cable corrosion monitoring system and monitoring method based on magnetic field gradient tensor |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122109A (en) * | 2014-08-01 | 2014-10-29 | 山西省交通科学研究院 | System for identifying rigidity damage of bridge structure |
| CN104483322A (en) * | 2014-12-11 | 2015-04-01 | 长沙理工大学 | Detection system for bridge rope |
| CN104483322B (en) * | 2014-12-11 | 2017-05-31 | 长沙理工大学 | The detecting system of bridge rope |
| CN104458830A (en) * | 2014-12-29 | 2015-03-25 | 邢鹏达 | Bridge cable damage electric detecting device and detecting method |
| CN106124610A (en) * | 2016-06-29 | 2016-11-16 | 中国海洋石油总公司 | A kind of broken strand of steel cable detection device |
| CN106093184B (en) * | 2016-07-08 | 2019-11-26 | 中铁大桥科学研究院有限公司 | Bridge cable electromagnetic flaw detection device and its application |
| CN106093184A (en) * | 2016-07-08 | 2016-11-09 | 中铁大桥科学研究院有限公司 | Bridge cable electromagnetic flaw detection device and application thereof |
| CN106814131A (en) * | 2016-12-30 | 2017-06-09 | 哈尔滨工业大学深圳研究生院 | A kind of ferromagnetic in-plane component shallow damage magnetic launches detection method and magnetic emission detection system |
| CN106968173A (en) * | 2017-04-28 | 2017-07-21 | 西南大学 | Main rope of suspension bridge corrosion monitoring system and method based on magnetic field |
| CN108982013A (en) * | 2018-08-16 | 2018-12-11 | 中铁大桥科学研究院有限公司 | For judging device, method and the calculation method of bridge rotation critical balance |
| CN108982013B (en) * | 2018-08-16 | 2020-05-05 | 中铁大桥科学研究院有限公司 | Device and method for judging bridge rotation critical balance and calculating method |
| CN109884177A (en) * | 2019-03-08 | 2019-06-14 | 重庆交通大学 | A kind of stayed structure damage position and range determining method based on magnetic memory signal |
| CN110108782A (en) * | 2019-04-18 | 2019-08-09 | 东南大学 | The leakage magnetic detection device based on magnetoresistance applied to suspension cable |
| CN110455910A (en) * | 2019-08-21 | 2019-11-15 | 西南大学 | Cable-stayed bridge cable corrosion monitoring system and monitoring method based on magnetic field gradient tensor |
| CN110455910B (en) * | 2019-08-21 | 2022-11-11 | 西南大学 | Cable-stayed bridge cable corrosion monitoring system and monitoring method based on magnetic field gradient tensor |
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Address after: 103 No. 430000 Hubei Province in Qiaokou District of Wuhan city road construction Applicant after: BRIDGE SCIENCE AND TECHNOLOGY INSTITUTE CO., LTD., CHINA RAILWAY ENGINEERING GROUP Applicant after: Group Co., Ltd., Zhongtie Daqiao Bureau Address before: 430000 No. 103, Jianshe Avenue, Wuhan, Hubei Applicant before: China Zhongtie Major Bridge Engineering Group Co., Ltd. Applicant before: Group Co., Ltd., Zhongtie Daqiao Bureau |
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Application publication date: 20130417 |