CN105157596A - Intelligent electricity channel deformation monitoring system and method - Google Patents
Intelligent electricity channel deformation monitoring system and method Download PDFInfo
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- CN105157596A CN105157596A CN201510658390.6A CN201510658390A CN105157596A CN 105157596 A CN105157596 A CN 105157596A CN 201510658390 A CN201510658390 A CN 201510658390A CN 105157596 A CN105157596 A CN 105157596A
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Abstract
The invention relates to an intelligent electricity channel deformation monitoring system and method which are used for sensing the deformation of an electricity channel in an electricity channel power transmission network. The system comprises distributed sensing optical fibers which are arranged on vertical steel bars of the electricity channel between two electricity channel working well and are used for transmitting and returning sensing signals; a strain acquisition instrument which is connected with the distributed sensing optical fibers and is used for sending sensing signals to the distributed sensing optical fibers, receiving echo signals and judging the deformation state of the electricity channel; a central server which is communicated with the strain acquisition instrument and is used for generating instructions to control the sensing signal sending frequency, range and precision of the strain acquisition instrument and receiving and storing the deformation state data of the electricity channel; and an onsite user terminal which is in communication with the central server through a wireless network in a maintenance field and is used for obtaining the deformation state data of the electricity channel. Compared with the prior art, the intelligent electricity channel deformation monitoring system and method have the advantages of intelligent monitoring, precise positioning, lower cost and the like.
Description
Technical field
The present invention relates to Geotechnical Engineering to prevent and reduce natural disasters field, especially relate to a kind of intelligent electric power comb DEFORMATION MONITORING SYSTEM and method.
Background technology
Along with the deepening continuously of process of Chinese Urbanization, city is also increasing by geometric progression to the demand of electric power.And overhead transmission line also exists various shortcoming: transmission capacity is little, floor area is large, hinders the appearance of the city, and opposing disaster ability is weak, goes wrong frequently, easily causes security incident etc.Therefore adopt the modes such as electricity channel that power transmission facility is landed, become the major way of the problem solving urban electricity supply.At present, each city, the whole nation all has a huge electricity channel power transmission network.As one of urban lifeline engineering, electric power supply is pulled one hair and move the whole body, and how to take effective measures and carries out perception to guarantee that its operation security becomes the problem needing solution at present badly to existing electricity channel net.
Electricity channel is generally embedded in below road, below road and the adjacent domain urban construction activity region the most frequently such as excavation of foundation pit, subway work or other hidden crossing project constructions often.In the process, very easily there is damage cracking in electricity channel particularly external wrapping concrete, thus lose the ability of protection internal power cable and affect its normal safe operation, and above-mentioned phenomenon is particularly serious in soft clay area.But, electricity channel as underground engineering with shallow, its disguise cause traditional monitoring mode be difficult to execute into, and cable tube caliber is narrow and small, and high-tension cable runs through wherein, is therefore also difficult to lay sensor in cable tube inside.As can be seen here, research realize comb from perception, set up Intelligent drainage tubular construction, become the objective requirement realizing comb state real-time perception.
Intelligent structure is by imbedding various kinds of sensors and controller in inside configuration or utilizing material self character etc. make structure have and have more desirable bionic functions, such as: from perception, autodiagnosis, self-control and reparation, being a new and developing branch of preventing and reducing natural disasters in recent years, is also the developing direction of Future Projects structure.But be no matter the diagnosis to structural behaviour, or structure control and adjustment, all depend on the Measurement accuracy for structure real-time status.
Fiber optic monitoring technology is in recent years along with optical fiber communication technology grows up, the novel monitoring technology of being undertaken monitoring by the change of physical features parameter as intensity (power), wavelength, frequency, phase place and polarization state etc. of light wave in perception optical fiber transmitting procedure, to have, high precision, high sensitivity; Electromagnetism interference; Electrical insulating property is good; Permanance is strong, is applicable to long term monitoring; Geometric configuration is plastic, strong adaptability; Loss is little, the advantages such as long distance detection can be realized, wherein, based on the optical fiber in the distributed optical fiber sensing technology of Brillouin scattering principle, being transmission medium, is again sensor, therefore can accomplish structure super distributed, seamless monitoring, but at present this technology do not have be applied to electricity channel malformation in perception operation.Distributed Optical Fiber Sensing Techniques to be applied to the distortion of electricity channel in perception operation, need to solve following problem:
1, sensor fibre layout scheme in electricity channel, lays sensor fibre efficiently and obtains enough data volumes for the differentiation to comb deformation pattern, and can save the consumption of optical fiber.
2, how electricity channel structural behaviour method of discrimination, utilize the data monitored to differentiate electricity channel deformation pattern and duty.
3, electricity channel distortion is from sensory perceptual system, and the workflow of this system generally comprises, perception, analyzes, decision-making, process, perception again, thus the robotization and the systematization that realize whole perception flow process.
Summary of the invention
Object of the present invention be exactly in order to overcome above-mentioned prior art exist defect and a kind of intellectual monitoring, registration, cost-effective intelligent electric power comb DEFORMATION MONITORING SYSTEM and method are provided.
Object of the present invention can be achieved through the following technical solutions:
A kind of intelligent electric power comb DEFORMATION MONITORING SYSTEM, in order to the deformation of the electricity channel in perception electricity channel power transmission network, this system comprises:
Distributed sensing fiber: be arranged on the longitudinal reinforcement of the electricity channel between two electricity channel active wells, in order to transmit and to return induced signal;
Strain acquirement instrument: be connected with distributed sensing fiber, sends induced signal to distributed sensing fiber, and accepts echoed signal, judge the deformation state of electricity channel;
Central server: communicate with strain acquirement instrument, produces the frequency of instruction controlled strain Acquisition Instrument transmission induced signal, scope and precision, and the deformation state data of reception and store power comb;
Onsite user's terminal: communicated with central server by wireless network at Overhaul site, obtains the deformation state data of electricity channel.
Described longitudinal reinforcement is provided with many and shaping with electricity channel formed by integrally casting, is separately positioned on the midpoint between the drift angle of electricity channel xsect and adjacent drift angle.
Described distributed sensing fiber is provided with many in same section of electricity channel, every bar distributed sensing fiber under tensile state parallel colligation on the longitudinal reinforcement of correspondence.
The two ends of described electricity channel are provided with opening, and every bar distributed sensing fiber stretches out opening and is connected with the sensor fibre of adjacent power comb.
The opening part of described electricity channel to the joint of the distributed sensing fiber in electricity channel active well to be wrapped up by geotextile or corrugated tube nested.
A detection method for intelligent electric power comb DEFORMATION MONITORING SYSTEM, comprises the following steps:
1) induced signal of different sample frequency, spatial resolution and precision is set according to different electricity channel;
2) the original induced signal strain value that electricity channel is tested complete man-hour is at first obtained;
3) the test induced signal strain value during work of Real-time Obtaining electricity channel;
4) if the difference existed between original induced signal strain value and test induced signal strain value is greater than the threshold value of setting, then judge that this section of electricity channel exists deformation or crack, and carry out step 5);
5) according to the spatial distribution map of the echo of test induced signal, position and the direction in this section of electricity channel generation deformation or crack is obtained, according to the acquiring size deformation of difference or the size in crack.
Compared with prior art, the present invention has the following advantages:
The present invention is the system of carrying out from perception to electricity channel malformation based on Distributed Optical Fiber Sensing Techniques, can accurately to the distortion of calandria structure, damage, position with cracking phenomena, and impact is assessed, all accomplish in real time to the performance of each calandria structure in whole electricity channel network after forming network, accurately, efficient monitoring, realize the intellectuality of electricity channel distortion sensory perceptual system, save a large amount of manpower and materials cost, at the deformation monitoring to operation phase electricity channel, structural behaviour is diagnosed, tie up in the work of supporting with electricity channel net and have a good application prospect.
Accompanying drawing explanation
Fig. 1 is electricity channel structure of the present invention and inner distribution type fiber-optic installation position schematic diagram thereof.
Fig. 2 is the canonical discriminate analysis curve that in embodiment, electricity channel deforms.
Fig. 3 is the canonical discriminate analysis curve of electricity channel defect in embodiment, and wherein, figure (3a) is fault location end face strain curve, and figure (3b) is fault location bottom surface strain curve.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment:
Distributed sensing fiber is implanted in the specific position of electricity channel xoncrete structure, when electricity channel structure deforms, the distributed sensing fiber of its inside can cooperative transformation thereupon, thus utilize distributed sensing fiber to the sensing characteristics of strain, use distributive fiber optic strain analyser can collect the strain value in each cross section of structure, thus obtain structure buries place underground deformation state at distributed sensing fiber.Same cross section in comparison structure, otherness between diverse location strain value draws this cross section each point Strain Distribution situation, thus what can judge that this electricity channel structural section occurs accurately is sedimentation, protuberance or lateral deformation, and can be assessed this type of be out of shape degree of impairment that structure is caused, crack accurate location and size thereof.
Be prepared in advance the outer general single mode distributed sensing fiber covering rubber protection; in electricity channel construction period; by distributed sensing fiber colligation on longitudinal reinforcement; and build shaping; in the upper shed of comb template; distributed sensing fiber is introduced in electricity channel active well, and wrap up or the nested fibre-optical splice be drawn out in electricity channel active well with protection of corrugated tube by geotextile in the construction time.
After calandria structure has been built, by end to end for multiple distributed sensing fiber imbedded in electricity channel structure, composition electricity channel fiber-optic monitoring net after series connection, final access is by fibre strain analyser, the electricity channel malformation sensory perceptual system of data process&analysis equipment composition, thus obtain the situation of change of structure internal strain and temperature, and by data storing or output in onsite user's terminal.
Electricity channel structure is uninterruptedly monitored, thus the strain value obtained along distributed sensing fiber position each point in each moment electricity channel structure, the difference that the preliminary examination strain value of rear gained built by this strain value and comb is electricity channel and runs the phase interior additional strain occurred.The deformation values along distributed sensing fiber position in comb segment distance can be calculated according to the strain recorded.Record the position that there is structure additional strain and be the position that comb deforms.
According to the end face that same cross section is arranged, the difference of bottom surface and the strain value measured by the distributed sensing fiber of side, can draw the bending direction of comb at this point according to beam line of deflection computing method, amount of deflection size, whether existing defects.According to concrete grade and maximumly allow that the large I of tension and compression strain value and this additional strain value judges the cracking situation of calandria structure at this point.
The position of distributed sensing fiber in comb is extremely important, and distributed sensing fiber is arranged in four mid points and four angle points on the limit, cross section four of calandria structure, is arranged on the longitudinal reinforcement in structure along comb trend.End well is introduced and the reserved surplus capacity can crossed over end well length and locate to next comb embedded light fibre in its two ends.Keep optical fiber and comb to move towards parallel in process of deployment, and keep certain and stretching force.
(1) intelligent electric power calandria structure distortion perception net is constructed
As shown in Figure 1, four distributed sensing fibers are longitudinally arranged at four mid points of electricity channel cross section four edges and angle point.During laying, optical fiber is stretching, under the state keeping certain pretightning force with band by optical fiber colligation on longitudinal reinforcement, this be in order to make optical fiber can with structure cooperative transformation, thus record the deformation of structure each point accurately.Active well is introduced at optical fiber two ends, and casting concrete agent structure.By end to end for the optical fiber of multistage comb after construction time terminates, composition intelligent electric power comb deformation monitoring network, and incoming fiber optic strain analysis instrument.
Data collection and analysis
At central server according to parameters such as the structural character of each section of intelligent electric power comb and development of deformation situation reasonable set sample frequency, spatial resolution, precision, carry out continual data acquisition afterwards, when local data variation is larger, improves sample frequency and hold malformation state of development more accurately.
As shown in Figure 2, data analysis process comprises, and show that structure deforms fragment position, fault of construction position and generation position, crack, and can differentiate the direction that structural bending is out of shape according to the spatial distribution data of structural strain.
As best shown in figures 3 a and 3b, when the strain value that calculating real-time sampling obtains and completion structure, the difference of preliminary examination strain value, obtains structural strain value.According to the stress of this value computation structure, amount of deflection, Size of Crack.
Claims (6)
1. an intelligent electric power comb DEFORMATION MONITORING SYSTEM, in order to the deformation of the electricity channel in perception electricity channel power transmission network, it is characterized in that, this system comprises:
Distributed sensing fiber: be arranged on the longitudinal reinforcement of the electricity channel between two electricity channel active wells, in order to transmit and to return induced signal;
Strain acquirement instrument: be connected with distributed sensing fiber, sends induced signal to distributed sensing fiber, and accepts echoed signal, judge the deformation state of electricity channel;
Central server: communicate with strain acquirement instrument, produces the frequency of instruction controlled strain Acquisition Instrument transmission induced signal, scope and precision, and the deformation state data of reception and store power comb;
Onsite user's terminal: communicated with central server by wireless network at Overhaul site, obtains the deformation state data of electricity channel.
2. a kind of intelligent electric power comb DEFORMATION MONITORING SYSTEM according to claim 1, it is characterized in that, described longitudinal reinforcement is provided with many and shaping with electricity channel formed by integrally casting, is separately positioned on the midpoint between the drift angle of electricity channel xsect and adjacent drift angle.
3. a kind of intelligent electric power comb DEFORMATION MONITORING SYSTEM according to claim 2, it is characterized in that, described distributed sensing fiber is provided with many in same section of electricity channel, every bar distributed sensing fiber under tensile state parallel colligation on the longitudinal reinforcement of correspondence.
4. a kind of intelligent electric power comb DEFORMATION MONITORING SYSTEM according to claim 1, it is characterized in that, the two ends of described electricity channel are provided with opening, and every bar distributed sensing fiber stretches out opening and is connected with the sensor fibre of adjacent power comb.
5. a kind of intelligent electric power comb DEFORMATION MONITORING SYSTEM according to claim 4, is characterized in that, the opening part of described electricity channel to the joint of the distributed sensing fiber in electricity channel active well to be wrapped up by geotextile or corrugated tube nested.
6. a detection method for the intelligent electric power comb DEFORMATION MONITORING SYSTEM of application as described in any one of claim 1-5, is characterized in that, comprise the following steps:
1) induced signal of different sample frequency, spatial resolution and precision is set according to different electricity channel;
2) the original induced signal strain value that electricity channel is tested complete man-hour is at first obtained;
3) the test induced signal strain value during work of Real-time Obtaining electricity channel;
4) if the difference existed between original induced signal strain value and test induced signal strain value is greater than the threshold value of setting, then judge that this section of electricity channel exists deformation or crack, and carry out step 5);
5) according to the spatial distribution map of the echo of test induced signal, position and the direction in this section of electricity channel generation deformation or crack is obtained, according to the acquiring size deformation of difference or the size in crack.
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| CN105773235A (en) * | 2016-05-23 | 2016-07-20 | 安庆市峰邦工业产品设计有限公司 | Clamp clamping and releasing device for shaft part |
| CN106524936A (en) * | 2016-11-11 | 2017-03-22 | 青岛理工大学 | Tunnel pipe shed deformation monitoring method |
| CN110174142A (en) * | 2019-07-08 | 2019-08-27 | 广东电网有限责任公司 | A kind of embedded intelligence monitoring device of cable duct bank |
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