CN111174662A - Displacement sensing device and application thereof - Google Patents
Displacement sensing device and application thereof Download PDFInfo
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- CN111174662A CN111174662A CN202010174395.2A CN202010174395A CN111174662A CN 111174662 A CN111174662 A CN 111174662A CN 202010174395 A CN202010174395 A CN 202010174395A CN 111174662 A CN111174662 A CN 111174662A
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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
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
Abstract
The application belongs to the technical field of measuring equipment, and particularly relates to a displacement sensing device and application thereof. The existing cable detection and monitoring adopts an intelligent cable with a built-in optical fiber sensor, the state of the optical fiber sensor is uncertain, and the data reliability in the application process is insufficient. The intelligent inhaul cable with the built-in magnetic flux inner sensor has the advantages that the sensor deduces the inhaul cable force through the change of the area of the cross section of the inhaul cable, and the state of the inhaul cable cannot be effectively analyzed when the inhaul cable is corroded or the cross section of a part of the inhaul cable is withdrawn from work due to other reasons. The application provides a displacement sensing device, displacement sensing subassembly and power supply collection subassembly including interconnect, displacement sensing subassembly includes displacement sensor, sensing steel wire and measures the steel wire, displacement sensor is connected with sensing steel wire one end, the sensing steel wire other end is connected with measurement steel wire one end. The intelligent inhaul cable has convenient replacement conditions, and is more convenient to produce, transport, install, use and maintain subsequently.
Description
Technical Field
The application belongs to the technical field of measuring equipment, and particularly relates to a displacement sensing device and application thereof.
Background
Guy cables, which are also commonly referred to as cable, guy cable, stay cable, sling, suspender, tie rod, external cable and steel bundle, are used in large civil engineering infrastructure such as cable-stayed bridges, suspension bridges, guy arch bridges and buildings using guy cables to bear load, and help structures to realize large-span spanning or provide high-strength prestress, and are key structural stress members for transferring tensile load. The effective inhaul cable detection and automatic monitoring method can avoid unnecessary maintenance and replacement, greatly prolong the service life of the inhaul cable, and can also accurately evaluate the safety state of the inhaul cable to avoid catastrophic accidents such as failure and the like.
The construction and maintenance of the infrastructure need to consume a large amount of manpower and material resources, and are precious wealth for the nation and people, wherein the key structural stress component inhaul cable inevitably causes structural damage accumulation and resistance attenuation under the coupling action of factors such as environmental erosion, long-term effect of material aging and load, fatigue effect and sudden catastrophe and the like in the service life of dozens of years, so that the capability of resisting natural disasters and even normal use is reduced, and the inhaul cable can be caused to fail to cause catastrophic accidents under extreme conditions. In addition, the investment proportion of the guy cable in large civil engineering infrastructure is also very high, the cost of newly building the guy cable by taking a cable-stayed bridge as an example accounts for about 25 percent of the full bridge, the service life of the component needing to be replaced is only 20 years, the cost required for replacement is about 90 to 200 percent of the construction period, and if the service life of the guy cable can be prolonged, the social value of the guy cable is played to the maximum extent for the operation and maintenance of the infrastructure.
The safety state of the cable needs to be evaluated by detection or automatic monitoring. In the existing detection method of the inhaul cable, the manual detection method is mainly used for observing the surface of the structure through naked eyes or a magnifier, and has no effect on internal defects; the detection method of the ultrasonic wave or vibration wave instrument is characterized in that the obtained fluctuation signal is analyzed by generating the fluctuation signal, the damage size and the damage position of the stay cable are detected, but when the surface of the steel wire of the stay cable is uneven, the stay cable has constraint or signal interference generated by other self-structure reasons, the effective analysis and discrimination can not be realized; the ray detection can only be carried out for one section, and cannot be used for detecting an anchoring area, so that the detection cost is higher, the instrument is expensive, and certain radioactivity is realized; although the magnetic flux leakage detection method can clearly judge the positions and the number of broken wires, the device is complex, the detection precision and the spatial resolution of the same defect are not high for the pull sling with an outer protective layer, and the detection effect is worse for the damage of the pull sling embedded in a beam. The automatic monitoring of the inhaul cable is realized by adopting an intelligent inhaul cable with a built-in optical fiber sensor, and the optical fiber sensor is uncertain in self state and insufficient in data feasibility in the application process due to different materials of the optical fiber and the inhaul cable; the intelligent inhaul cable with the built-in magnetic flux inner sensor has the advantages that the sensor deduces the inhaul cable force through the change of the area of the cross section of the inhaul cable, and the state of the inhaul cable cannot be effectively analyzed when the inhaul cable is corroded or the cross section of a part of the inhaul cable is withdrawn from work due to other reasons.
Disclosure of Invention
1. Technical problem to be solved
In the detection method based on the existing inhaul cable, the manual detection method is mainly used for observing the surface of the structure through naked eyes or a magnifying lens, and the internal defects are not considered; the detection method of the ultrasonic wave or vibration wave instrument is characterized in that the obtained fluctuation signal is analyzed by generating the fluctuation signal, the damage size and the damage position of the stay cable are detected, but when the surface of the steel wire of the stay cable is uneven, the stay cable has constraint or signal interference generated by other self-structure reasons, the effective analysis and discrimination can not be realized; the ray detection can only be carried out for one section, and cannot be used for detecting an anchoring area, so that the detection cost is higher, the instrument is expensive, and certain radioactivity is realized; although the magnetic flux leakage detection method can clearly judge the positions and the number of broken wires, the equipment is complex, the detection precision is not high for the pull sling with an outer protective layer, the spatial resolution of the same defect is not high, and the detection effect is poor for the damage of the pull sling embedded in a beam. Meanwhile, the intelligent inhaul cable with a built-in optical fiber sensor is adopted in the automatic monitoring of the existing inhaul cable, and due to the fact that the difference between materials of the optical fiber and the inhaul cable is different, the state of the optical fiber sensor is uncertain, and the feasibility degree of data in the application process is insufficient; the intelligent inhaul cable with the built-in magnetic flux inner sensor has the advantages that the sensor deduces the inhaul cable force through the change of the area of the cross section of the inhaul cable, and the state of the inhaul cable cannot be effectively analyzed when the inhaul cable is corroded or the cross section of a part of the inhaul cable is withdrawn from work due to other reasons. The application provides a displacement sensing device for detecting and automatically monitoring the safety state of a stay cable and application thereof.
2. Technical scheme
In order to reach foretell purpose, this application provides a displacement sensing device, including interconnect's displacement sensing subassembly and power supply collection subassembly, the displacement sensing subassembly includes displacement sensor, sensing steel wire and measures the steel wire, displacement sensor is connected with sensing steel wire one end, the sensing steel wire other end is connected with measurement steel wire one end.
Another embodiment provided by the present application is: a length scale is arranged on the sensing steel wire; one end of the sensing steel wire extends into the displacement sensor to form one of the displacement sensor components; the other end of the sensing steel wire is connected with the measuring steel wire; the size of the section of the sensing steel wire is smaller than that of the measuring steel wire; after the joint of the sensing steel wire and the measuring steel wire enters the measuring steel wire hole, a measuring scale can be inserted into the measuring steel wire hole to measure the length of the sensing steel wire extending into the measuring steel wire hole.
Another embodiment provided by the present application is: the power supply acquisition assembly comprises a solar cell panel, a power control management module, a rechargeable battery, a data storage chip, a single-chip microcomputer control processing chip and a wireless transmission communication module, wherein the solar cell panel is connected with the power control management module, the power control management module is connected with the rechargeable battery, and the power control management module is connected with the single-chip microcomputer control processing chip; the power control management module is connected with the data storage chip; the power control management module is connected with the wireless transmission communication module; the single chip microcomputer control processing chip is connected with the data storage chip; the singlechip control processing chip is connected with the wireless transmission communication module; the single chip microcomputer control processing chip is connected with the displacement sensor.
Another embodiment provided by the present application is: the power supply acquisition assembly further comprises an indicator lamp, the single chip microcomputer control processing chip is connected with the indicator lamp, the power supply control management module is connected with the displacement sensor through a communication cable, and the single chip microcomputer control processing chip is connected with the displacement sensor through a communication cable.
Another embodiment provided by the present application is: the measuring steel wire comprises a measuring steel wire pier head anchor, and the measuring steel wire pier head anchor is arranged at the end part of the measuring steel wire.
The application also provides an application of the displacement sensing device, and the displacement sensing device is applied to the inhaul cable.
Another embodiment provided by the present application is: the inhaul cable comprises a first anchorage device anchor cup and a second anchorage device anchor cup, the first anchorage device anchor cup is arranged at one end of the inhaul cable, and the second anchorage device anchor cup is arranged at the other end of the inhaul cable; a protective barrel is arranged outside the first anchor device anchor cup, the protective barrel is connected with the first anchor device anchor cup, the displacement sensor is arranged in the protective barrel, and the sensing steel wire is arranged in the protective barrel;
and the other end of the measuring steel wire is connected with the second anchorage device anchor cup.
Another embodiment provided by the present application is: the measuring steel wire hole is formed in the first anchor device anchor cup, the measuring steel wire hole, the protection tube and the protection spring tube are sequentially connected, the second anchor device anchor cup is internally provided with a second wire dividing plate, epoxy iron sand is filled in the second anchor device anchor cup, and the measuring steel wire sequentially penetrates through the measuring steel wire hole, the protection tube, the protection spring tube, the second wire dividing plate and the epoxy iron sand.
Another embodiment provided by the present application is: the measuring steel wire is connected with the second anchorage device anchor cup through the measuring steel wire pier head anchor.
Another embodiment provided by the present application is: the first anchor device is characterized in that a communication cable hole is formed in the first anchor device anchor cup and connected with a cable protection tube, the displacement sensor is connected with the power supply acquisition assembly through a communication cable, the communication cable is arranged in the communication cable hole, and the communication cable is arranged in the cable protection tube.
Another embodiment provided by the present application is: the displacement sensor is connected with the power supply acquisition assembly through a communication cable, one end of the communication cable is connected with the other end of the displacement sensor and is connected with the power supply acquisition assembly, and the communication cable is arranged in the communication cable hole and the inside of the cable protection tube.
3. Advantageous effects
Compared with the prior art, the displacement sensing device and the beneficial effect of using the same that this application provides lie in:
the application provides a displacement sensing device is applied to the cable, lets the cable possess self safe state's measurable quantity, perception, can early warning, the removable function of sensing element, constitutes an intelligent cable scheme, hereinafter is called "this application intelligence cable for short.
The application provides a displacement sensing device is applied to the cable, possesses convenient change condition, can acquire the extension value of cable, and production, transportation, installation and the follow-up maintenance of this application intelligence cable are also more convenient simultaneously.
The application of the displacement sensing device provided by the application, the test data that acquire is directly relevant with cable safety state, both can the inquiry of manual check mode, also can avoid unnecessary change in the use of cable through remote automation monitoring early warning cable safety state, promotes cable life by a wide margin, avoids catastrophic occurence of failure such as cable inefficacy, has great economic and social value.
The application of the displacement sensing device that this application provided, displacement sensor and sensing steel wire are connected, have the length scale on the sensing steel wire, and the scale can show displacement sensor by tensile length, is exactly the tensile extension value that produces of cable by tensile length. Both can carry out artifical reading through the scale, can insert again with the measuring tape and measure the downthehole measurement of steel wire and measure the steel wire and stretch into downthehole length, the artifical extension value that reads the cable.
The application of the displacement sensing device that this application provided, these parts of displacement sensor, power supply collection subassembly and communication cable are removable parts, can change at any time when these parts damage, and the cable that reads through the manual work after the change draws the extension value, can realize the continuation of this application intelligence cable automatic monitoring data, like this application intelligence cable alright realize with engineering life-span synchronous with the life of perception function in this application intelligence cable with the extension as required.
The application of the displacement sensing device can be used for evaluating whether the cable can be normally used or not by the cable extension value read by a simple manual measuring rule without the help of external special instruments and equipment.
The application of the displacement sensing device can carry out data comparison through the artificial reading and the extension value measured by the sensor, and timely corrects and evaluates the use state and the test precision of the electronic element.
The application of the displacement sensing device provided by the application has the advantages that the same anchoring process is adopted for the anchoring of the measuring drawn wire in the second anchorage device anchoring cup and the steel wire bundle bearing the tensile load, and the anchoring of the measuring drawn wire is more reliable.
The application of the displacement sensing device that this application provided, the inner structure is similar with ordinary cable structure, does not change the anchor technology and the flow of the inside former steel silk bundle of cable, so the production of this application scheme cable, transportation and installation adopt technology to be close with ordinary cable, do not increase the production of cable, transportation and the installation degree of difficulty, and production, transportation and installation are convenient with ordinary cable equally.
The application of the displacement sensing device provided by the application does not change the anchoring process and the stress mode of the original steel wire bundle in the inhaul cable because the measuring steel wire does not participate in the stress, so that the use function of the ordinary inhaul cable is not influenced when any part of the displacement sensing device implanted with the inhaul cable breaks down or is damaged.
The application of the displacement sensing device that this application provided, the installation component is connected after communication cable and power supply collection subassembly are independent, and inside all the other components were located the steel material, intelligent cable outward appearance and ordinary cable outward appearance do not have obvious difference during the cable installation, and the cable installation does not have the weak components and parts that need special protection.
The application of the displacement sensing device that this application provided, the main displacement conduction device that measures the amount of extension of intelligent cable is the measurement steel wire, the steel strand with bearing the tensile load is with material same batch material, because of measuring steel wire itself and not bearing the tensile load in the use, according to the corrosion principle corrosion takes place the corrosion more easily under the high stress environment under the same material equivalent condition under the material, so measure the steel wire and compare the more difficult emergence corrosion with the steel strand that bears the tensile load, measure steel wire life and want to be greater than the steel strand that bears the tensile load, this makes this application intelligence cable main measuring unit can be with the cable with the life-span, durability is better.
Drawings
FIG. 1 is a schematic diagram of an application of the displacement sensing device of the present application;
FIG. 2 is a schematic diagram of a partial structure of the displacement sensing device of the present application;
FIG. 3 is an enlarged schematic view of a sensor wire of the present application;
FIG. 4 is a schematic representation of data acquired by the displacement sensing device of the present application;
FIG. 5 is a schematic diagram of data acquired for a similar product on the market;
in the figure: 1-power supply acquisition component, 2-displacement sensor, 3-sensing steel wire, 4-measuring steel wire, 5-protective spring tube, 6-measuring steel wire pier head anchor, 7-protective barrel, 8-first anchor cup, 9-second anchor cup, 10-first wire dividing plate, 11-second wire dividing plate, 12-measuring end anchoring plate, 13-protective tube, 14-measuring steel wire hole and 15-communication cable hole, 16-communication cable, 17-anchor anchoring nut, 18-anchor supporting plate, 19-sealing barrel, 20-PE sheath, 21-epoxy iron sand, 22-fixed end anchoring plate, 23-anchor sealing plate, 24-backing ring, 25-heat-shrinkable waterproof pipe, 26-cable protecting pipe and 27-steel wire bundle.
Detailed Description
Hereinafter, specific embodiments of the present application will be described in detail with reference to the accompanying drawings, and it will be apparent to those skilled in the art from this detailed description that the present application can be practiced. Features from different embodiments may be combined to yield new embodiments, or certain features may be substituted for certain embodiments to yield yet further preferred embodiments, without departing from the principles of the present application.
The inhaul cable is also commonly called as a cable, an inhaul cable, a stay cable, a sling, a suspender, a tie rod, an external cable and a steel bundle, and is a member bearing tension load, wherein the member is formed by sticking, extruding or winding a plurality of high-strength steel wires or high-strength steel wire bundles into one, and the two ends of the member are anchored on anchorage devices at the two ends through chemical bonding, extruding and clamping pieces or pier heads. The inner part of the inhaul cable mainly bears the tensile load by high-strength steel wires or high-strength steel wire bundles, the high-strength steel wires or the high-strength steel wire bundles can also be called steel wire bundles, and the high-strength steel wires or the high-strength steel wire bundles are formed by parallel high-strength steel wires or a plurality of high-strength steel wire bundles wound together, and the tensile force is transmitted to the anchorage at the other end from the anchorage at one end through the steel wire bundles during working, so that.
The safety state of the cable needs to be evaluated by detection or automatic monitoring. In the existing detection method of the inhaul cable, the manual detection method is mainly used for observing the surface of the structure through naked eyes or a magnifier, and has no effect on internal defects; the detection method of the ultrasonic wave or vibration wave instrument is characterized in that the obtained fluctuation signal is analyzed by generating the fluctuation signal, the damage size and the damage position of the stay cable are detected, but when the surface of the steel wire of the stay cable is uneven, the stay cable has constraint or signal interference generated by other self-structure reasons, the effective analysis and discrimination can not be realized; the ray detection can only be carried out for one section, and cannot be used for detecting an anchoring area, so that the detection cost is higher, the instrument is expensive, and certain radioactivity is realized; although the magnetic flux leakage detection method can clearly judge the positions and the number of broken wires, the device is complex, the detection precision and the spatial resolution of the same defect are not high for the pull sling with an outer protective layer, and the detection effect is worse for the damage of the pull sling embedded in a beam. The automatic monitoring of the inhaul cable is realized by adopting an intelligent inhaul cable with a built-in optical fiber sensor, and the optical fiber sensor is uncertain in self state and insufficient in data feasibility in the application process due to different materials of the optical fiber and the inhaul cable; the intelligent inhaul cable with the built-in magnetic flux inner sensor has the advantages that the sensor deduces the inhaul cable force through the change of the area of the cross section of the inhaul cable, and the state of the inhaul cable cannot be effectively analyzed when the inhaul cable is corroded or the cross section of a part of the inhaul cable is withdrawn from work due to other reasons.
The displacement sensor can be a linear displacement sensor or an angular displacement sensor. The displacement sensor may also be referred to as a pull cord displacement meter, a pull cord sensor, a pull cord electronic ruler, a pull cord encoder, a linear displacement sensor, a magnetoelastic displacement sensor, an electromagnetic induction displacement sensor, or a grid displacement sensor. The basic function of the displacement sensor is to convert the linear mechanical displacement into an electrical signal with a specific relationship, and further convert the electrical signal into quantized data.
Referring to fig. 1 ~ 5, the application provides a displacement sensing device, displacement sensing subassembly and power supply collection subassembly 1 including interconnect, the displacement sensing subassembly includes displacement sensor 2, sensing steel wire 3 and measures steel wire 4, displacement sensor 2 is connected with 3 one end of sensing steel wire, the 3 other ends of sensing steel wire are connected with 4 one end of measurement steel wire. One end of the sensing steel wire 3 extends into the displacement sensor 2.
The scale reading of the sensing steel wire 3 scale at the orifice position of the measuring steel wire hole 14 is 0 when the inhaul cable does not bear any load, the length of the sensing steel wire 3 pulled out of the displacement sensor 2 is increased along with the increase of the tensile load borne by the inhaul cable, the sensing steel wire 3 enters the measuring steel wire hole 14, and the length value of the sensing steel wire 3 entering the measuring steel wire hole 14 is the extension value of the inhaul cable.
2 range of displacement sensor that this application adopted can be confirmed according to the extension change range in the cable use, and displacement sensor 2 can convert straight line mechanical displacement volume into the signal of telecommunication of specific relation, can be perceived by power supply collection subassembly 1.
Further, the sensing steel wire 3 is a stay wire type displacement sensor steel wire, a length scale is arranged on the sensing steel wire, and the section size of the sensing steel wire 3 is smaller than that of the measuring steel wire 4.
The sensing steel wire 3 is provided with a length scale ruler, so that the extension value of the inhaul cable can be read directly during inspection.
Further, the power supply acquisition assembly 1 comprises a solar cell panel, a power control management module, a rechargeable battery, a data storage chip, a single-chip microcomputer control processing chip and a wireless transmission communication module, wherein the solar cell panel is connected with the power control management module, the power control management module is connected with the rechargeable battery, and the power control management module is connected with the single-chip microcomputer control processing chip; the power control management module is connected with the data storage chip; the power control management module is connected with the wireless transmission communication module; the single chip microcomputer control processing chip is connected with the data storage chip; the singlechip control processing chip is connected with the wireless transmission communication module; the single chip microcomputer control processing chip is connected with the displacement sensor 2.
Further, the power supply acquisition assembly 1 further comprises an indicator light, the single chip microcomputer control processing chip is connected with the indicator light, the power supply control management module is connected with the displacement sensor through a communication cable, and the single chip microcomputer control processing chip is connected with the displacement sensor through a communication cable. The power supply acquisition assembly 1 is connected with the displacement sensor 2 through a communication cable 16. Displacement sensor 2 can convert straight line mechanical displacement volume into the signal of telecommunication of specific relation, power control management module in the power supply collection subassembly 1 supplies power to displacement sensor 2 through the communication cable, the singlechip control processing chip in the power supply collection subassembly 1 responds to displacement sensor 2's the signal of telecommunication change, convert the signal of telecommunication of sensing into displacement sensor 2's measured value according to specific corresponding relation, singlechip control processing chip in the power supply collection subassembly 1 stores displacement sensor 2's measured value in data storage chip, the singlechip control processing chip in the power supply collection subassembly 1 reads the historical data in the data storage chip, send to the cloud platform server through wireless transmission communication module.
The single chip microcomputer control processing chip in the power supply acquisition assembly 1 acquires the cable operation parameters set by the cloud platform server through the wireless transmission communication module, and the cable operation parameters comprise system green, yellow and red three-color early warning value intervals, data effective intervals, calibration system time, reporting data interval time and data sampling frequency parameters. The single chip microcomputer control processing chip samples according to a given sampling frequency, system time is calibrated according to cloud platform feedback time, data collection is conducted on the displacement sensor 2 according to a given data sampling frequency parameter, data are pushed to a cloud platform server according to a given time interval, a data early warning value interval and a data effective interval are contrasted according to a measured value of the collected displacement sensor 2, a display indicator lamp is activated, and the current safety state of the stay cable is displayed.
The solar cell panel in the power supply acquisition assembly 1 charges the rechargeable battery through the power supply control management module, and the solar cell panel and the rechargeable battery supply power to the indicating lamp, the data storage chip, the single chip microcomputer control processing chip, the wireless transmission communication module and the displacement sensor 2 through the power supply control management module.
The power supply acquisition assembly 1 can also directly carry out data communication with the handheld terminal through a data line so that an inspector can directly acquire data, or can also transmit the data to a terminal of a user through a WeChat applet or other modes through a wireless transmission communication module, so that the user can acquire the data more conveniently.
The application also provides an application of the displacement sensing device, and the displacement sensing device is applied to the inhaul cable.
The length of the stay cable is determined according to the requirements of engineering application environment, and the length of the stay cable is usually between 1m and 10000 m.
Further, the inhaul cable comprises a first anchor cup 8 and a second anchor cup 9, the first anchor cup 8 is arranged at one end of the inhaul cable, a communication cable hole 15 is formed in the first anchor cup 8, a protection barrel 7 is arranged on the outer side of the first anchor cup 8, the protection barrel 7 is connected with the first anchor cup 8, the displacement sensor 2 is arranged in the protection barrel 7, the second anchor cup 9 is arranged at the other end of the inhaul cable, and a sealing barrel 19 is arranged on the inner side of the second anchor cup 9 (the sealing barrel 19 is arranged on the inner sides of the first anchor cup 8 and the second anchor cup 9). The sensing steel wire 3 is arranged in the protective barrel 7;
the other end of the measuring steel wire 4 is connected with the second anchorage device anchor cup 10.
Further, a measuring steel wire hole 14 is formed in the first anchor cup 8, the measuring steel wire hole 14, the protection tube 13 and the protection spring tube 5 are sequentially connected, a second wire dividing plate 11 is arranged in the second anchor cup 9, and the measuring steel wire 4 sequentially penetrates through the measuring steel wire hole 14, the protection tube 13, the protection spring tube 5, the second wire dividing plate 11 and the epoxy iron sand and then penetrates through the end part to be anchored on the fixed end anchoring plate 22. The inside of the first anchor cup 8 is provided with a sealing barrel 19, the first anchor cup 8 is connected with the sealing barrel 19, the protection pipe 13 is arranged in the sealing barrel 19, and the cable protection pipe 26 is arranged outside the sealing barrel 19.
The measuring steel wire 4 sequentially penetrates through the measuring steel wire hole 14, the protecting tube 13, the protecting spring tube 5, the second wire dividing plate 11, the epoxy iron sand 21 and the fixed end anchoring plate 22, wherein the measuring steel wire hole 14, the protecting tube 13 and the protecting spring tube 5 can protect the measuring steel wire 4, the measuring accuracy of the system is prevented from being influenced by hoop pressure and frictional resistance of the measuring steel wire 4, and the second wire dividing plate 11, the epoxy iron sand 21 and the fixed end anchoring plate 22 bond and anchor the measuring steel wire 4 to enable the measuring steel wire 4 and the second anchor cup 9 to form integral common stress. The inner diameter sizes of the measuring steel wire hole 14, the protection tube 13 and the protection spring tube 5 are all larger than the outer diameter size of the measuring steel wire 4.
When the anchor anchorage nuts 17 at the two ends of the inhaul cable (the anchor anchorage nuts 17 are arranged on the first anchor cup 8 and the second anchor cup 9) are stretched towards two sides, the load can be transmitted to the anchor anchorage nuts 17 through anchor supporting plates 18 (the anchor supporting plates 18 are arranged on the first anchor cup 8 and the second anchor cup 9), the anchor anchorage nuts 17, the first anchor cup 8 and the second anchor cup 9 are connected into a whole through threads, and the load is transmitted to the first anchor cup 8 and the second anchor cup 9 through the anchor anchorage nuts 17 (the first anchor cup and the second anchor cup are the same component only for distinguishing). The shape of the inside of the anchorage device anchor cup is that one end is big, the other end is small, the smaller end is provided with a wire dividing plate (the first wire dividing plate 10 and the second wire dividing plate 11 have the same structure, the first and the second are only used for distinguishing, and are the same component with the wire dividing plate), the bigger end of the first anchorage device anchor cup 8 is provided with a measuring end anchoring plate 12, the bigger end of the second anchorage device anchor cup 9 is provided with a fixed end anchoring plate 22, a steel wire bundle 27 penetrates through the first wire dividing plate 10 and is dispersedly anchored on the measuring end anchoring plate 12 at the rear end, the steel wire bundle 27 penetrates through the second wire dividing plate 11 and is dispersedly anchored on the fixed end anchoring plate 22 at the rear end, the gap between the first wire dividing plate 10 and the measuring end anchoring plate 12 is filled with iron oxide sand 21, the first wire dividing plate 10, the measuring end anchoring plate 12 and the filled iron oxide sand 21 form a whole body with the first anchorage device by the bonding and anchoring action, epoxy iron sand 21 is filled in a gap between the second wire splitting plate 11 and the fixed end anchoring plate 22 in a pouring mode, and the other end of the steel wire bundle 27 bearing the tensile force and the second anchorage device anchoring cup 9 form a stressed whole through bonding and anchoring effects by the second wire splitting plate 11, the fixed end anchoring plate 22 and the filled epoxy iron sand 21. Load can be transmitted to the second anchorage device anchor cup 9 from the first anchorage device anchor cup 8 through the steel wire bundle 27, and the function that the inhaul cable bears tensile load is achieved.
Further, a communication cable hole 15 is formed in the first anchor cup 8, the communication cable hole 15 is connected with a cable protection pipe 26, and a communication cable 16 led out from the displacement sensor 2 sequentially penetrates through the communication cable hole 15 and the cable protection pipe 26 and then is connected to the power supply acquisition assembly 1.
In the whole process of the stay cable, the steel wire bundle 27 bears all cable force loads, the steel wire bundle 27 can be elongated and deformed along with the increase of the load bearing tension, and the magnitude of the bearing tension is in direct proportion to the elongation of the steel wire bundle 27 according to the Hooke's law principle. Meanwhile, a measuring steel wire 4 specially used for measurement is arranged in the inhaul cable, the measuring steel wire 4 and a steel wire bundle 27 in a second anchorage device anchor cup 9 are connected with the second anchorage device anchor cup 9 into a whole by the same anchoring method, and the measuring steel wire 4 sequentially penetrates through a protective spring tube 5, a protective tube 13 and a measuring steel wire hole 14 after coming out of a second wire dividing plate 11 of the second anchorage device anchor cup 9 and then is connected to a displacement sensor 2 through a sensing steel wire 3. The measuring steel wire 4 can freely stretch out and draw back inside the inhaul cable under the protection of the protecting spring tube 5, the protecting tube 13 and the measuring steel wire hole 14, the measuring steel wire 4 does not bear the cable force load of the inhaul cable all the time, so that a length difference can be generated between the steel wire bundle 27 and the measuring steel wire 4, the length difference is the extension value of the steel wire bundle 27 under the action of external load, and the numerical value of the extension value can be obtained through the connecting of the sensing steel wire 3 and the displacement sensor 2 at the tail end of the measuring steel wire 4. The value of the extension quantity is linearly related to the effective working section stress of the stay cable, and is closely related to the safety state of the stay cable, the size of the tensile load borne by the effective section of the stay cable can be calculated through measuring the value of the extension quantity, and the effective working section stress of the stay cable can be further analyzed and evaluated to judge whether the stay cable is in a normal working state.
The PE sheath 20 wraps the outer sides of the measuring steel wire 4 and the steel wire bundle, and plays a role in sealing and protecting the measuring steel wire 4 and the steel wire bundle to prevent rusting. The anchor sealing plate 23 is arranged in the first anchor cup 8 and the second anchor cup 9, and plays a role in sealing and protecting steel wires in the anchor cups of the anchors. Backing ring 24 sets up in sealed bucket 19 and the junction of PE sheath 20, because of sealed bucket 19 is the steel material, PE sheath 20 is flexible material, and backing ring 24 plays the cushioning effect of buffering both contact points, prevents that sealed bucket 19 scratch PE sheath 20 from causing PE sheath 20 damaged.
The thermal shrinkage waterproof pipe 25 is arranged at the joint of the sealed barrel 19 and the PE sheath 20, the PE sheath 20 is inserted into the sealed barrel 19, a certain gap exists between the two, the thermal shrinkage waterproof pipe 25 wraps the outer side of the joint of the sealed barrel 19 and the PE sheath 20, the joint of the sealed barrel 19 and the PE sheath 20 is achieved, and the purpose of preventing the corrosion of the steel wire 4 and the steel wire bundle inside the PE sheath 10 is achieved.
The displacement sensing device provided by the application measures that the steel wire 4 adopts the same batch of materials as the steel wire bundle 27 bearing the tensile load, so that the steel wire bundle has the same material elastic modulus and thermal expansion coefficient, and the length variation quantity generated by the steel wire bundle and the thermal expansion coefficient is consistent when the temperature is increased or reduced, so that the stretching quantity drift and the error caused by the measurement temperature change can be eliminated to the maximum extent, and the precision of the test data is higher.
Simulation experiment is carried out in this application, and with the measuring device setting that lays in this application in cable PE sheath 20 inside in simulation experiment outside a ordinary cable PE sheath 20, obtained hoist cable effective stress test data on certain arched bridge, compare like shown in fig. 3 and fig. 4 with conventional test method. The monitoring data of this application design is sensitive to the cable force change of the cable that vehicle load and temperature arouse, can obviously see out the influence of temperature variation every day to cable stress and the influence of vehicle load to cable stress from the monitoring data curve.
Although the present application has been described above with reference to specific embodiments, those skilled in the art will recognize that many changes may be made in the configuration and details of the present application within the principles and scope of the present application. The scope of protection of the application is determined by the appended claims, and all changes that come within the meaning and range of equivalency of the technical features are intended to be embraced therein.
Claims (10)
1. A displacement sensing device, characterized by: displacement sensing subassembly and power supply collection subassembly including interconnect, the displacement sensing subassembly includes displacement sensor, sensing steel wire and measures the steel wire, sensing steel wire one end with displacement sensor connects, the sensing steel wire other end with measure steel wire one end and connect.
2. The displacement sensing device of claim 1, wherein: the sensing steel wire is provided with a length scale, and the cross-sectional dimension of the sensing steel wire is smaller than that of the measuring steel wire.
3. The displacement sensing device according to claim 1 or 2, wherein: the power supply acquisition assembly comprises a solar cell panel, a power control management module, a rechargeable battery, a data storage chip, a single-chip microcomputer control processing chip and a wireless transmission communication module, wherein the solar cell panel is connected with the power control management module, the power control management module is connected with the rechargeable battery, and the power control management module is connected with the single-chip microcomputer control processing chip; the power control management module is connected with the data storage chip; the power control management module is connected with the wireless transmission communication module; the single chip microcomputer control processing chip is connected with the data storage chip; the singlechip control processing chip is connected with the wireless transmission communication module; the single chip microcomputer control processing chip is connected with the displacement sensor.
4. A displacement sensing device according to claim 3, wherein: the power supply acquisition assembly further comprises an indicator lamp, the single chip microcomputer control processing chip is connected with the indicator lamp, the power supply control management module is connected with the displacement sensor through a communication cable, and the single chip microcomputer control processing chip is connected with the displacement sensor through a communication cable.
5. The displacement sensing device of claim 1, wherein: the measuring steel wire comprises a measuring steel wire pier head anchor, and the measuring steel wire pier head anchor is arranged at the end part of the measuring steel wire.
6. Use of a displacement sensing device, characterized by: the displacement sensing device is applied to the inhaul cable.
7. Use of a displacement sensing device according to claim 6, wherein: the inhaul cable comprises a first anchorage device anchor cup and a second anchorage device anchor cup, the first anchorage device anchor cup is arranged at one end of the inhaul cable, and the second anchorage device anchor cup is arranged at the other end of the inhaul cable; a protective barrel is arranged outside the first anchor device anchor cup, the protective barrel is connected with the first anchor device anchor cup, the displacement sensor is arranged in the protective barrel, and the sensing steel wire is arranged in the protective barrel;
and the other end of the measuring steel wire is connected with the second anchorage device anchor cup.
8. Use of a displacement sensing device according to claim 7, wherein: the measuring steel wire hole is formed in the first anchorage device anchor cup, the measuring steel wire hole, the protection tube and the protection spring tube are sequentially connected, the second anchorage device anchor cup is internally provided with a second wire dividing plate, and the measuring steel wire sequentially penetrates through the measuring steel wire hole, the protection tube, the protection spring tube, the second wire dividing plate and epoxy iron sand.
9. Use of a displacement sensing device according to claim 7, wherein: the first anchor device is characterized in that a communication cable hole is formed in the first anchor device anchor cup and connected with a cable protection tube, the displacement sensor is connected with the power supply acquisition assembly through a communication cable, the communication cable is arranged in the communication cable hole, and the communication cable is arranged in the cable protection tube.
10. Use of a displacement sensor device according to any of claims 7 to 9, wherein: the measuring steel wire is connected with the second anchorage device anchor cup through the measuring steel wire pier head anchor.
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| CN111174662B (en) | 2021-12-14 |
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