CN111947563A - Concrete dam joint division monitoring device and method based on radio frequency identification technology - Google Patents
Concrete dam joint division monitoring device and method based on radio frequency identification technology Download PDFInfo
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- CN111947563A CN111947563A CN202010794925.3A CN202010794925A CN111947563A CN 111947563 A CN111947563 A CN 111947563A CN 202010794925 A CN202010794925 A CN 202010794925A CN 111947563 A CN111947563 A CN 111947563A
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- antenna
- parting
- monitoring device
- radio frequency
- concrete dam
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
- G06K17/0029—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device the arrangement being specially adapted for wireless interrogation of grouped or bundled articles tagged with wireless record carriers
Abstract
The invention discloses a concrete dam parting monitoring device based on a radio frequency identification technology, which comprises plastic filler, an RFID (radio frequency identification) tag and a cover plate, wherein the plastic filler is filled into the surface of a parting; the RFID tag resonant frequency is 950MHz, the antenna is a rectangular coil, the length of the patch is half wavelength, the direction of the long axis of the rectangular coil is consistent with the direction of the maximum main stress of the monitoring part, when the RFID tag resonant frequency monitoring device is used, a wireless reader is packaged on the machine in a waterproof mode, the machine moves forwards along the seam on the surface of the dam, electromagnetic signals are continuously sent to a seam cover plate at different frequencies, the electromagnetic signals back scattered by the RFID tag antenna under the cover plate in a backward direction are received, the resonant frequency after the antenna is strained is obtained, and the drift amount of the resonant frequency is calculated. The invention can be implanted into the joint of the concrete dam without damage, can accurately measure the strain of the joint, transmits data back on water and under water, does not need to connect a cable, has good system stability and can prevent lightning.
Description
Technical Field
The invention belongs to the technical field of hydraulic engineering safety monitoring, and particularly relates to a concrete dam joint-separating monitoring device and method based on a radio frequency identification technology.
Background
The concrete dam is huge in size, in order to avoid cracking caused by difficult release of heat generated during hydration of concrete, construction of the concrete dam is usually carried out in sections, and the concrete dam after pouring forming can have cracks. Meanwhile, the seam division can also avoid cracking and damage of different dam sections or structural components due to inconsistent deformation. In both the split gravity dam and the face rock-fill dam, there are a large number of structural splits. Because the parting belongs to the weak position of the structure, overlarge parting strain can cause the parting to be damaged and the water retaining to be invalid, thereby causing dam break. Therefore, the strain monitoring method for the concrete dam parting is an important means for avoiding structural damage and acquiring the deformation state of each part of the concrete dam, and has obvious engineering significance.
The existing concrete dam joint monitoring is mainly characterized in that a strain gauge is arranged outside a cover plate, and the opening degree of the joint is recorded periodically. The basic arrangement is shown in figure 6. The disadvantages are that: (1) additional cables are required to connect the data acquisition device and the strain gauge. Because the monitoring system is connected with current, the monitoring system is easy to be hit by thunder and lightning in the field environment, and the monitoring system is paralyzed and monitoring data is lost; (2) a support, a strain gauge, a protective sleeve and the like are required to be arranged outside the parting cover plate, so that the dam body structure is damaged, and the durability of the dam is influenced.
Disclosure of Invention
In order to solve the problems, the invention discloses a concrete dam parting monitoring device based on a radio frequency identification technology, which can be implanted into a concrete dam without damage, can accurately measure the strain of a parting, transmits data back on water and under water, does not need to be connected with a cable, has good system stability and can prevent lightning.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a concrete dam parting monitoring device based on radio frequency identification technology comprises plastic filler, an RFID tag and a cover plate, wherein the plastic filler is filled into the parting surface, the RFID tag is adhered to the inner side of the top of the cover plate, and the cover plate is fixed on the plastic filler.
As an improvement of the invention, the plastic filler is glass fiber reinforced plastic resin adhesive.
As an improvement of the invention, the resonance frequency of the RFID tag is 950MHz, the antenna is a rectangular coil, the length of the patch is one-half wavelength, the direction of the long axis of the rectangular coil is consistent with the direction of the maximum main stress of the monitoring part, and the effective communication distance is 20cm under the wrapping of concrete.
As an improvement of the invention, the cover plate is an arc-shaped plate protruding upwards.
As an improvement of the invention, the cover plate is connected with the concrete dam through expansion bolts.
As an improvement of the invention, the cover plate is made of stainless steel.
A method for using a concrete dam joint monitoring device based on radio frequency identification technology comprises the steps of waterproof packaging a wireless reader with a frequency sweeping function, attaching the wireless reader to a machine, advancing along joints on the surface of a dam, continuously sending electromagnetic signals to joint cover plates at different frequencies, receiving the electromagnetic signals back scattered by an RFID tag antenna under the cover plate, measuring the working frequency at which the back scattering energy of the RFID tag antenna is minimum, obtaining the resonant frequency after the antenna is strained, and calculating the drift amount of the resonant frequency.
The invention has the beneficial effects that:
the concrete dam joint separation monitoring device based on the radio frequency identification technology is a semi-active monitoring device, can be implanted into a joint of a concrete dam without damage, can accurately measure the strain of the joint, transmits data back on water and under water, does not need to connect a cable, is good in system stability, and can prevent lightning.
Drawings
FIG. 1 is a flow chart of the use of the present invention.
Fig. 2 is a schematic diagram of an RFID tag according to the present invention.
Fig. 3 is a schematic view of the installation of the monitoring device according to the present invention.
FIG. 4 is a schematic diagram of example 2 of a specific embodiment.
Fig. 5 is a diagram illustrating the mounting effect of embodiment 2 of the embodiment.
Fig. 6 is a schematic diagram of a conventional inspection apparatus.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Example 1
(1) Label design
As shown in the figure, the concrete dam parting monitoring device based on the radio frequency identification technology firstly designs an RFID tag, the resonant frequency is 950MHz, the antenna is a rectangular coil, the length of a patch is half wavelength, the direction of the long axis of the rectangular coil is consistent with the direction of the maximum main stress of a monitoring part, and the effective communication distance is 20cm under the wrapping of concrete. As shown in fig. 2.
(2) Tag implantation
And (3) filling plastic fillers on the surface of the parting, adhering the designed RFID label to the inner side of the top of the arc-shaped cover plate by using the plastic fillers (glass reinforced plastic resin adhesive), and fixing the two ends of the stainless steel cover plate on the parting by using expansion bolts. The encapsulation effect is shown in fig. 3.
(3) Data reading
To determine the existing strain of the antenna, the resonant frequency of the antenna in a strained state is determined. The resonant frequency is the optimum operating frequency of the antenna, and when the antenna operates at the resonant frequency, the backscattered energy is the least under the incidence of electromagnetic waves.
When a gentle slope exists on the surface of the dam, a climbing robot can be used for reading data. The wireless reader with the frequency sweeping function is subjected to waterproof packaging, attached to a climbing robot and crawled along the surface of a dam along a seam, electromagnetic signals are continuously sent to a seam cover plate at different frequencies, and the electromagnetic signals which are back-scattered by an RFID tag antenna under the cover plate are received. And measuring the minimum backscattering energy of the RFID tag antenna at which working frequency to obtain the resonance frequency of the antenna after strain, and calculating the drift amount of the resonance frequency.
When dam surface slope is steep, can't adopt the robot climbing, can instead carry on the ware of reading with unmanned aerial vehicle to hover at each height, to the electromagnetic wave of RFID label transmission, accomplish data reading.
(4) Data analysis
Rectangular patch antenna resonant frequency affected by the radiating patch length
Wherein, c is the speed of light,eis the effective dielectric constant. L is the radiating patch length, Δ L is the compensation length, whereeCalculated by the following formula:
wherein the content of the first and second substances,ris the relative dielectric constant of the dielectric substrate and L is the radiating patch length. The compensation length Δ L is calculated by the following equation:
wherein h is the dielectric plate thickness, W is the radiating patch width,eis the effective dielectric constant. Generally, Δ L is much smaller than L, and when a small strain occurs in the length direction of a rectangular patch antenna, the antenna resonant frequency is approximately linear with the strain, and the slope is about the initial resonant frequency of the antenna:
and (4) calculating the drift amount of the resonant frequency according to the strained resonant frequency of the antenna obtained in the step (3), and determining the strain amount experienced by the antenna, namely the strain of the seam, by combining a formula (4).
Example 2
The concrete dam joint separation monitoring device and method based on the radio frequency identification technology are not only suitable for joint separation of concrete dams, but also suitable for surface strain monitoring of concrete dams, joint separation monitoring of tunnel culverts, joint separation monitoring of building structures and the like.
For example, monitoring of building seams requires additional packaging with steel panels.
The RFID tag is clamped by two steel plates for packaging, and the material of the packaging steel plates is the same as the grade of the steel bar in the concrete, as shown in figure 4.
Then, the packaging steel plate is arranged at the deformation joint, and as shown in fig. 5, electromagnetic waves are emitted to the RFID tag by a machine, so that data reading is completed.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features.
Claims (9)
1. The utility model provides a concrete dam parting monitoring devices based on radio frequency identification technique which characterized in that: the RFID label is adhered to the inner side of the top of the cover plate, and the cover plate is fixed on the plastic filler.
2. The concrete dam parting monitoring device based on the radio frequency identification technology as claimed in claim 1, wherein: the plastic filler is glass fiber reinforced plastic resin adhesive.
3. The concrete dam parting monitoring device based on the radio frequency identification technology as claimed in claim 1, wherein: the RFID tag has the resonant frequency of 950MHz, the antenna is a rectangular coil, the length of the patch is one-half wavelength, the direction of the long axis of the rectangular coil is consistent with the direction of the maximum main stress of the monitoring part, and the effective communication distance is 20cm under the wrapping of concrete.
4. The concrete dam parting monitoring device based on the radio frequency identification technology as claimed in claim 1, wherein: the cover plate is an arc-shaped plate protruding upwards.
5. The concrete dam parting monitoring device based on the radio frequency identification technology as claimed in claim 1, wherein: the cover plate is connected with the concrete dam through expansion bolts.
6. The concrete dam parting monitoring device based on the radio frequency identification technology as claimed in claim 1, wherein: the cover plate is made of stainless steel.
7. The use method of the concrete dam parting monitoring device based on the radio frequency identification technology as claimed in claim 1, characterized in that: the wireless reader with the frequency sweeping function is subjected to waterproof packaging, attached to a machine and moves forward along the seam of the surface of the dam, electromagnetic signals are continuously sent to a seam cover plate at different frequencies, the electromagnetic signals back scattered by the RFID tag antenna under the cover plate are received, the backscattering energy of the RFID tag antenna under which working frequency is the minimum is measured, the resonant frequency after the antenna is strained is obtained, and the drift amount of the resonant frequency is calculated.
8. The use method of the concrete dam parting monitoring device based on the radio frequency identification technology as claimed in claim 7, characterized in that: when the surface of the dam is a gentle slope, a climbing robot is adopted to read data; when the dam surface is the abrupt slope, when unable adoption robot climbing, change into unmanned aerial vehicle and carry on the ware of reading to hover at each height, launch the electromagnetic wave to the RFID label, accomplish data reading.
9. The use method of the concrete dam parting monitoring device based on the radio frequency identification technology as claimed in claim 7, characterized in that: the step of calculating the drift amount of the resonance frequency is:
rectangular patch antenna resonant frequency affected by the radiating patch length
Wherein, c is the speed of light,eis the effective dielectric constant, L is the radiating patch length, Δ L is the compensation length, whereeBy passingThe following formula is calculated:
wherein the content of the first and second substances,ris the relative dielectric constant of the dielectric substrate, L is the radiating patch length, and the compensation length Δ L is calculated by the following formula:
wherein h is the dielectric plate thickness, W is the radiating patch width,eis the effective dielectric constant, generally, Δ L is smaller than L, when small strain occurs in the length direction of the rectangular patch antenna, the antenna resonant frequency is linear to the strain, and the slope is the initial resonant frequency of the antenna:
and (4) calculating the drift amount of the resonant frequency according to the strained resonant frequency of the antenna obtained in the step (3), and determining the strain amount experienced by the antenna, namely the strain of the seam, by combining a formula (4).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113466935A (en) * | 2021-06-30 | 2021-10-01 | 中国建筑第八工程局有限公司 | Trigger type detection device for deformation threshold detection and detection method thereof |
| CN113465491A (en) * | 2021-07-01 | 2021-10-01 | 四川大学 | Strain sensing monitoring system and method based on miniaturized label sensor array |
| CN116305473A (en) * | 2023-03-23 | 2023-06-23 | 水利部交通运输部国家能源局南京水利科学研究院 | Block safe and stable design method for downstream energy dissipation bottom plate of steel dam gate |
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