CN104458830A - Bridge cable damage electric detecting device and detecting method - Google Patents
Bridge cable damage electric detecting device and detecting method Download PDFInfo
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- CN104458830A CN104458830A CN201410828816.3A CN201410828816A CN104458830A CN 104458830 A CN104458830 A CN 104458830A CN 201410828816 A CN201410828816 A CN 201410828816A CN 104458830 A CN104458830 A CN 104458830A
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Abstract
The invention discloses a bridge cable damage electric detecting device and a bridge cable damage electric detecting method. The detecting device comprises a voltage regulating module, a voltage output guide wire, a current detector, a current amplifying module, a resistance calculating module, a resistance comparing module and a damage rate calculating module; the detecting method comprises the following steps: A, generating and detecting current; B, calculating the resistance; C, comparing the resistance; and D, calculating the damage rate. The resistance value is measured and calculated electrically, the area change value is determined according to the difference value between the measured resistance value and the theoretical resistance value, the detecting principle is simple; during specific detection, the voltage is only loaded to the two ends of the cable, so that only the current on the cable is needed to be measured; the specific operation steps are simple, during the measured result treatment, the measured current is amplified through a current amplifier for calculating the size of the resistance and amplifying the current value, so that the precise current value can be obtained, the calculating errors are small, and the calculated resistance value is relatively precise.
Description
Technical field
The present invention relates to damage detection for bridges technical field, be specifically related to a kind of bridge cable damage electric detection means and detection method.
Background technology
Rope bridge is the novel bridge type occurred after World War II, because it is aesthetic in appearance, easy construction and cost economic, now become the main bridge type of Longspan Bridge, the existing built a large amount of rope bridge of China, only just have in nearly 10 years and in succession build up more than the rope bridge of more than 20 seats across footpath more than 400m, more there is a collection of rope bridge being in prostatitis, the world across footpath in construction or in establishing, line structure system is the main supporting member of Large Span Bridges, its security and permanance are very important to the normal use of bridge and general safety, due to the lifeline that line structure system is cableway platform, once because of permanance and security deficiency occur disease with deterioration, it accepts the serious accident that Disability can cause highway bridge to collapse, cause severe social influence and huge economic loss, built and excessive vibration has occurred many bridge blocks in operation, serious corrosion or disconnected rope accident.To be very important work to the detection of rope bridge damage, the monitoring device used at present is very complicated, and operation easier is larger, and the resultant error of detection is larger.
Summary of the invention
With regard to the defect of above prior art, the object of this invention is to provide a kind of bridge cable damage electric detection means and detection method.
A kind of bridge cable damage electric detection means and detection method, pick-up unit comprises: voltage regulating module, voltage output lead, current detector, Current amplifier module, resistance calculations module, resistance comparison module, damage ratio computing module, and detection method is:
The generation of A, electric current and detection: it is lower value that voltage regulating module adjusts output voltage, by voltage output lead by voltage-drop loading long for L1, cross-sectional area be the metal cords two ends of S1, current detector detects the electric current in metal cords;
The calculating of B, resistance: the current value detected is transferred to Current amplifier module, Current amplifier module will obtain very big current value after Current amplifier, by the data transfer of very big current to resistance calculations module, resistance calculations module obtains output voltage values from voltage regulating module, magnitude of voltage is amplified to the multiple identical with current amplification factor, and resistance calculations module calculates resistance sizes by the size of voltage and current value;
C, resistance compare: the resistance value calculated is transferred to resistance comparison module, (what calculate theoretical resistance value is R=ρ (L/S) according to formula for the resistance value that resistance comparison module calculates passing a test and the resistance value that theory calculate obtains, the resistivity that R is resistance sizes, ρ is conductor, L are the length of conductor, S is the cross-sectional area of conductor) compare, draw resistance difference;
D, damage ratio calculate: according to the resistance difference R1 calculated and actual resistance error coefficient m, calculate actual resistance difference Rg=R1m, according to formula: R=ρ (L/S) calculates the changing value Sg=L ρ/R of cable cross-sectional area, be damaged area size, thus calculate damage ratio St=Sg/S1.
Preferably, described resistance comparison module is provided with input unit, directly the theoretical resistance input resistance comparison module manually calculated maybe will be determined the factor input resistance comparison module of resistance value.
Preferably, by Current amplifier, be in order to the radix point of the numerical value by the electric current recorded moves several backward, thus obtain more accurate current value.
Preferably, the length L1 of cable, complete time cross-sectional area S1 directly can measure and obtain, the electricalresistivityρ of cable records by simply testing, experimental technique is as follows: get one section of circular rod identical with cable materials, recording circular rod cross-sectional area is Sa, and length is La, at circular rod two ends making alive Ua, recording the electric current that circular rod is passed through is Ia, calculates electricalresistivityρ to be: ρ=(Ua*Sa)/(Ia*La).
Beneficial effect of the present invention is: the present invention is by electrical measurement and calculate resistance value, again by the difference determination area change value measuring resistance value and the theoretical resistance obtained, Cleaning Principle is simple, during concrete detection, only need by the two ends of voltage-drop loading at cable, measure the size of current on cable, concrete operation step is simple, when to the result treatment measured, the electric current recorded is amplified through current amplifier, in the size for calculating resistance, current value is amplified, very accurate current value can be obtained, the error of calculation is little, thus the resistance value calculated is more accurate.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of bridge cable damage electric detection means that proposes of the present invention and detection method.
Embodiment
As shown in Figure 1, Fig. 1 is the structural representation of a kind of bridge cable damage electric detection means that proposes of the present invention and detection method.
With reference to Fig. 1, a kind of bridge cable damage electric detection means and detection method, pick-up unit comprises: voltage regulating module, voltage output lead, current detector, Current amplifier module, resistance calculations module, resistance comparison module, damage ratio computing module, described resistance comparison module is provided with input unit, and directly the theoretical resistance input resistance comparison module manually calculated maybe will be determined the factor input resistance comparison module of resistance value, detection method is:
A, the generation of electric current and detection: it is lower value that voltage regulating module adjusts output voltage, by voltage output lead, voltage-drop loading is being grown for L1, the metal cords two ends of cross-sectional area to be S1 resistivity be ρ 1, current detector detects the electric current in metal cords, the length L1 of cable, cross-sectional area S1 time complete directly can measure and obtain, the electricalresistivityρ of cable records by simply testing, experimental technique as: get one section of circular rod identical with cable materials, recording circular rod cross-sectional area is Sa, length is La, at circular rod two ends making alive Ua, recording the electric current that circular rod is passed through is Ia, calculating electricalresistivityρ a is: ρ 1=ρ a=(Ua*Sa)/(Ia*La),
The calculating of B, resistance: the current value detected is transferred to Current amplifier module, Current amplifier module will obtain very big current value after Current amplifier, by Current amplifier, in order to the radix point of the numerical value by the electric current recorded moves several backward, thus obtain more accurate current value, by the data transfer of very big current to resistance calculations module, resistance calculations module obtains output voltage values from voltage regulating module, magnitude of voltage is amplified to the multiple identical with current amplification factor, and resistance calculations module calculates resistance sizes by the size of voltage and current value;
C, resistance compare: the resistance value calculated is transferred to resistance comparison module, (what calculate theoretical resistance value is R=ρ (L/S) according to formula for the resistance value that resistance comparison module calculates passing a test and the resistance value that theory calculate obtains, the resistivity that R is resistance sizes, ρ is conductor, L are the length of conductor, S is the cross-sectional area of conductor) compare, draw resistance difference;
D, damage ratio calculate: according to the resistance difference R1 calculated and actual resistance error coefficient m, calculate actual resistance difference Rg=R1m, according to formula: R=ρ (L/S) calculates the changing value Sg=L ρ/R of cable cross-sectional area, be damaged area size, thus calculate damage ratio St=Sg/S1.
The present invention is by electrical measurement and calculate resistance value, again by the difference determination area change value measuring resistance value and the theoretical resistance obtained, Cleaning Principle is simple, during concrete detection, only need by the two ends of voltage-drop loading at cable, measure the size of current on cable, concrete operation step is simple, when to the result treatment measured, the electric current recorded is amplified through current amplifier, in the size for calculating resistance, current value is amplified, can obtain very accurate current value, the error of calculation is little, thus the resistance value calculated is more accurate.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technology people of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (4)
1. a bridge cable damage electric detection means and detection method, it is characterized in that: pick-up unit comprises: voltage regulating module, voltage output lead, current detector, Current amplifier module, resistance calculations module, resistance comparison module, damage ratio computing module, detection method is:
The generation of A, electric current and detection: it is lower value that voltage regulating module adjusts output voltage, by voltage output lead by voltage-drop loading long for L1, cross-sectional area be the metal cords two ends of S1, current detector detects the electric current in metal cords;
The calculating of B, resistance: the current value detected is transferred to Current amplifier module, Current amplifier module will obtain very big current value after Current amplifier, by the data transfer of very big current to resistance calculations module, resistance calculations module obtains output voltage values from voltage regulating module, magnitude of voltage is amplified to the multiple identical with current amplification factor, and resistance calculations module calculates resistance sizes by the size of voltage and current value;
C, resistance compare: the resistance value calculated is transferred to resistance comparison module, (what calculate theoretical resistance value is R=ρ (L/S) according to formula for the resistance value that resistance comparison module calculates passing a test and the resistance value that theory calculate obtains, the resistivity that R is resistance sizes, ρ is conductor, L are the length of conductor, S is the cross-sectional area of conductor) compare, draw resistance difference;
D, damage ratio calculate: according to the resistance difference R1 calculated and actual resistance error coefficient m, calculate actual resistance difference Rg=R1m, according to formula: R=ρ (L/S) calculates the changing value Sg=L ρ/R of cable cross-sectional area, be damaged area size, thus calculate damage ratio St=Sg/S1.
2. a kind of bridge cable damage electric detection means according to claim 1 and detection method, it is characterized in that: described resistance comparison module is provided with input unit, directly the theoretical resistance input resistance comparison module manually calculated maybe will be determined the factor input resistance comparison module of resistance value.
3. a kind of bridge cable damage electric detection means according to claim 1 and detection method, its feature exists: by Current amplifier, is in order to the radix point of the numerical value by the electric current recorded moves several backward, thus obtains more accurate current value.
4. a kind of bridge cable damage electric detection means according to claim 1 and detection method, it is characterized in that: the length L1 of cable, complete time cross-sectional area S1 directly can measure and obtain, the electricalresistivityρ of cable records by simply testing, experimental technique is as follows: get one section of circular rod identical with cable materials, recording circular rod cross-sectional area is Sa, length is La, at circular rod two ends making alive Ua, recording the electric current that circular rod is passed through is Ia, calculates electricalresistivityρ to be: ρ=(Ua*Sa)/(Ia*La).
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| CN201410828816.3A CN104458830A (en) | 2014-12-29 | 2014-12-29 | Bridge cable damage electric detecting device and detecting method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108442251A (en) * | 2018-05-17 | 2018-08-24 | 四川大学 | Monitoring cable wire based on resistance variations and cable wire service state monitoring method |
| CN109115836A (en) * | 2018-09-10 | 2019-01-01 | 杭州后博科技有限公司 | A kind of luggage damage detection system and method |
| 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 |
| CN113866505A (en) * | 2021-09-17 | 2021-12-31 | 广东电网有限责任公司广州供电局 | Grounding grid on-resistance measurement and grounding grid state evaluation method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108442251A (en) * | 2018-05-17 | 2018-08-24 | 四川大学 | Monitoring cable wire based on resistance variations and cable wire service state monitoring method |
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| CN109115836A (en) * | 2018-09-10 | 2019-01-01 | 杭州后博科技有限公司 | A kind of luggage damage detection system and method |
| 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 |
| CN113866505A (en) * | 2021-09-17 | 2021-12-31 | 广东电网有限责任公司广州供电局 | Grounding grid on-resistance measurement and grounding grid state evaluation method and system |
| CN113866505B (en) * | 2021-09-17 | 2024-03-01 | 广东电网有限责任公司广州供电局 | Grounding grid on-resistance measurement and grounding grid state evaluation method and system |
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