CN213301544U - Bridge inhaul cable force increment accurate measurement device - Google Patents
Bridge inhaul cable force increment accurate measurement device Download PDFInfo
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- CN213301544U CN213301544U CN202021535969.6U CN202021535969U CN213301544U CN 213301544 U CN213301544 U CN 213301544U CN 202021535969 U CN202021535969 U CN 202021535969U CN 213301544 U CN213301544 U CN 213301544U
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Abstract
The utility model provides a bridge inhaul cable force increment accurate measuring device, which comprises a cable force tester, a transmission layer and a display layer; the cable force tester comprises an upper clamping ring, a lower clamping ring, four connecting rods, four strain gauges, a temperature compensation strain gauge and a strain acquisition instrument, wherein the upper clamping ring is connected with the lower clamping ring through the four connecting rods, each connecting rod is formed by connecting two force transfer rods and one deformation rod in series, the deformation rods are located between the two force transfer rods, the middle part of each deformation rod is provided with the strain gauge, the middle part of one of the four connecting rods is provided with the temperature compensation strain gauge, and the temperature compensation strain gauge and the four strain gauges are connected with the strain acquisition instrument. The utility model discloses a measuring device can overcome the shortcoming that can't install the foil gage on the cable, and it is simple to have the principle, and the advantage that the measuring accuracy is high is measured through using this measuring device, can realize dynamicization and long-term to the control of cable, and provides reliable guarantee for cable force determination.
Description
Technical Field
The utility model relates to a cable technical field, in particular to bridge inhaul cable power increment precision measurement device.
Background
The guy cable is an important bearing structure of a modern bridge, and comprises a guy cable of a cable-stayed bridge, a suspender of an arch bridge, external prestress of a part of bridge and the like. The judgment of the bridge structure state requires measuring the cable force of a stay cable, and the common method comprises the following steps: magnetic flux, pressure ring, and frequency methods. Among them, the magnetic flux method has few practical cases in China and is not technically mature enough. The pressure ring method has high test precision and can meet the test requirement of the cable force increment, but the method has the defects that the pressure ring needs to be preset when the cable is installed, the method cannot be used for the existing bridge, and the method is very expensive and cannot be popularized in a large scale. The frequency method includes both contact measurement and non-contact measurement, and the cable force is obtained by a frequency and cable force relational expression, which is very convenient in engineering application but has low precision. Obviously, the three methods have the problem of large error, especially when used on short cables. In view of the problems in the industries, the accurate measurement device for the cable force increment of the bridge cable, which is simple and convenient to test and high in test precision, is urgently needed.
SUMMERY OF THE UTILITY MODEL
In order to achieve the above purpose, the utility model adopts the technical proposal that:
a bridge inhaul cable force increment accurate measuring device comprises a cable force tester, a transmission layer and a display layer; the cable force tester comprises an upper clamping ring, a lower clamping ring, four connecting rods, four strain gauges, a temperature compensation strain gauge and a strain acquisition instrument, wherein the upper clamping ring and the lower clamping ring are parallel and opposite, a clamping through hole for a cable to pass through is formed in the middle of the upper clamping ring and the lower clamping ring, the aperture of the clamping through hole is slightly smaller than the diameter of the cable, the upper clamping ring and the lower clamping ring are connected through the four connecting rods, the four connecting rods are arranged at intervals and surround the periphery of the clamping through hole, each connecting rod is formed by connecting two force transmission rods and a deformation rod in series, the deformation rod is positioned between the two force transmission rods, the strain gauge is installed in the middle of each deformation rod, the temperature compensation strain gauge is installed in the middle of one of the four connecting rods, and the temperature compensation strain gauge and the four strain gauges are connected with the strain acquisition instrument; the transmission layer comprises a 4G/5G signal transmitter and a cloud end, and the strain acquisition instrument is connected with the cloud end through the 4G/5G signal transmitter; the display layer comprises terminal equipment, and the terminal equipment is in wireless connection with the cloud.
Preferably, the structure of the upper clamping ring is the same as that of the lower clamping ring, the upper clamping ring is in a circular ring shape and is equally divided into two semicircular rings, lug plates are welded at two ends of each semicircular ring in the arc length direction, a bolt hole is formed in each lug plate, the two semicircular rings are connected into a circular ring in a mode that a bolt hole is inserted in each semicircular ring through high-strength bolt threads, and the inner ring of each circular ring is the clamping through hole.
Preferably, the hole wall of the clamping through hole is engraved with a thread structure.
Preferably, all the connecting rods are the same in length, all the dowel bars are made of the same alloy and have circular cross sections perpendicular to the length direction.
Preferably, all the deformation rods are made of alloy, the cross section of each deformation rod in the direction perpendicular to the length direction is of a rectangular structure, the size of the cross section of each deformation rod is smaller than that of the cross section of the stay cable and that of the cross section of the dowel bar, and the elastic modulus of each deformation rod is smaller than that of the dowel bar.
Preferably, the terminal device is a computer, and the computer comprises a mobile phone and a tablet.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) the utility model provides a bridge inhaul cable power increment accurate measurement device, the device's advantage has: the applicability is wide, the operation is simple, the economy and the practicability are realized, and the repeated use is realized;
(2) the cable force tester realizes the amplification of strain through the difference of the tensile strength of the dowel bar and the deformation bar, thereby improving the precision of the cable force increment test; meanwhile, the temperature compensation sheet is arranged on the dowel bar, so that the interference of temperature on a test result is effectively eliminated, and the cable force measurement precision is further improved.
Drawings
Fig. 1 is a schematic structural view of the cable force tester of the present invention.
Fig. 2 is a schematic diagram of the system structure of the measuring device of the present invention.
Description of the main elements
In the figure: the device comprises an upper clamping ring 1, a lower clamping ring 2, a deformation rod 3, a bolt 4, a strain gauge 5, a temperature compensation strain gauge 6, a dowel steel 7, a cable force tester 10, a 4G/5G signal transmitter 20, a cloud end 30 and a terminal device 40.
The following detailed description of the invention will be further described in conjunction with the above-identified drawings.
Detailed Description
Referring to fig. 1 to 2, in a preferred embodiment of the present invention, an apparatus for accurately measuring a cable force increment of a bridge cable includes a cable force tester 10, a transmission layer and a display layer.
The cable force tester 10 comprises an upper clamping ring 1, a lower clamping ring 2, four connecting rods, four strain gauges 5, a temperature compensation strain gauge 6 and a strain acquisition instrument, the upper clamping ring 1 and the lower clamping ring 2 are parallel and opposite, the middle parts of the upper clamping ring and the lower clamping ring are provided with clamping through holes for the stay cable to pass through, the aperture of the clamping through hole is slightly smaller than the diameter of the cable, the upper clamping ring 1 and the lower clamping ring 2 are connected through four connecting rods which are arranged at intervals, and surrounds the circumference of the clamping through hole, each connecting rod is formed by connecting two dowel bars 7 and a deformation rod 3 in series, wherein, the pole 3 that warp is located between two dowel bars 7, and the mid-mounting strain gauge 5 of each pole 3 that warp, the mid-mounting temperature compensation foil gage 6 of one of them dowel bar 7 of four connecting rods, strain acquisition appearance is all connected to temperature compensation foil gage 6 and four foil gages 5. The utility model discloses a cable power tester 10 presss from both sides tight cable that awaits measuring through last clamp ring 1 and the centre gripping through-hole of clamp ring 2 down, make clamp ring 1 and clamp ring 2 down connect through the connecting rod, wherein, the connecting rod comprises dowel steel 7 and deformation pole 3, deformation pole 3 can be gone up clamp ring 1 and clamp ring 2 down and produce when shifting along with the cable atress and warp in step, this deformation is detected by strain gauge 5 on the deformation pole 3, the deformation condition of cable can be known to the testing result through strain gauge 5, furthermore, the temperature compensation strain gauge 6 that sets up on dowel steel 7 can be used to measure the deformation that temperature variation arouses, thereby improve the accuracy of this device test.
In this embodiment, the structure of the upper clamping ring 1 is the same as that of the lower clamping ring 2, the upper clamping ring 1 is in a circular ring shape and is equally divided into two semicircular rings, lug plates are welded at two ends of each semicircular ring in the arc length direction, bolt holes are formed in each lug plate, the two semicircular rings are connected into a circular ring in a mode that the bolt holes are inserted through high-strength bolts 4 in a threaded mode, and the inner ring of the circular ring is the clamping through hole. Preferably, the hole wall of the clamping through hole is engraved with a thread structure so as to increase the friction force of the upper clamping ring 1 and the lower clamping ring 2 for clamping the inhaul cable. Preferably, the length of all the connecting rods is the same, the material of all the dowel bars 7 is the same, the size is the same, all the dowel bars 7 are made of alloy, specifically, the alloy with light weight, large elastic modulus and low temperature sensitivity is adopted, and the cross section of the alloy in the vertical length direction is of a circular structure. All the material that warp pole 3 is the same, the size is the same, all warp pole 3 and all adopt the alloy to make, adopt light in weight specifically, elastic modulus is less, metal or alloy that temperature sensitivity is low, the cross section on its perpendicular length direction is dense for the rectangle structure, this cross section size all is less than cable cross section size and dowel steel 7's cross section size, specifically, the cross section size that warp pole 3 is less than cable cross section size and dowel steel 7's cross section size far away, thereby make warp pole 3 and dowel steel 7 when receiving the same pulling force, the deformation degree that warp pole 3 is greater than dowel steel 7's deformation degree far away, and the deformation that warp pole 3 can be synchronous with the deformation of cable, the pulling force that warp pole 3 shares can be ignored. In addition, the elastic modulus of the deformation rod 3 is smaller than that of the dowel bar 7, specifically, much smaller than that of the dowel bar 7, so that the tensile rigidity of the dowel bar 7 is far greater than that of the deformation rod 3, and therefore, when the cable deforms, only the deformation rod 3 deforms, and the dowel bar 7 does not deform.
The transmission layer includes 4G/5G signal transmitter 20 and high in the clouds 30, strain acquisition appearance passes through 4G/5G signal transmitter 20 and connects high in the clouds 30, strain acquisition appearance is used for gathering strain gage 5 and the strain signal that temperature compensation strain gage 6 detected to convert the signal of telecommunication that strain gage 5 gathered to digital signal, and transmit digital signal for high in the clouds 30 through 4G/5G signal transmitter 20. The display layer comprises a terminal device 40, the terminal device 40 is in wireless connection with the cloud 30, specifically in a wireless connection mode, so that data of the cloud 30 are received in real time through the Internet, relevant parameters of the stay cable to be detected are set on the terminal device 40, and the parameters are combined with the data transmitted by the cloud 30, so that the cable force increment of the stay cable to be detected can be obtained. Preferably, the terminal device 40 is a computer, and the computer includes a mobile phone and a tablet.
The utility model discloses in, the measuring principle of the cable force increment of the stay rope that awaits measuring is as follows:
the upper clamping ring 1 and the lower clamping ring 2 of the cable force tester 10 are clamped with the cable force to be tested, and the tensile rigidity of the dowel bar 7 is far greater than that of the deformation rod 3, so that only the deformation rod 3 deforms when the cable deforms. Let the cable force increment be Δ F, then the following relationship is given:
△F＝EAεc (1)
in the formula, EA is tensile rigidity of the stay, epsiloncIs the cable strain.
At the same time, the deformation rod 3 is straineddAnd strain epsilon of staycThe following relationships exist:
in the formula, LdTo vary the length, L, of the rod 3cIs the spacing between upper clamp ring 1 and lower clamp ring 2.
Strain epsilon of deformed rod 3 caused when temperature changesTComprises the following steps:
in the formula, epsilonaFor temperature compensation of the strain value, L, of the strain gauge 6TThe length of the dowel 7.
The following strain epsilon of the deformation rod 3 is obtained by combining the deformation caused by the tension and the deformation caused by the temperature changed：
In the formula, epsiloniThe strain value of the ith strain gage 5.
As can be seen from the formula (2), since LdIs much smaller than LcTherefore, the strain on the deformation rod 3 is far larger than that on the inhaul cable, so that the strain is amplified, and the test precision is greatly improved; and simultaneously, the utility model discloses an installation strain compensation piece's mode on dowel steel 7 both can realize the accuracy of cable power increment test under different temperatures.
Based on the principle, after the cable force tester 1010 clamps the cable, the strain value epsilon is obtained by measuring through the strain gauge 5iAnd measuring the strain value epsilon of the temperature compensation strain gauge 6 through the temperature compensation strain gauge 6aThe strain epsilon of the deformation rod 3 can be obtained by integrating all strain values and substituting the strain values into formula (4)dIn the case of knowing the tensile stiffness of the cable to be tested, the calculation will be madeResulting strain epsilon of deformed rod 3dSubstituting in formula (2) to obtain the strain epsilon of the stay cablecStrain the obtained cable by epsiloncThe cable force increment delta F of the inhaul cable can be obtained by substituting the formula (1). Therefore, the utility model provides a measuring device can be used to measure the cable force increment of bridge cable, and measures portably, convenient to use.
The above description is for the detailed description of the preferred possible embodiments of the present invention, but the embodiments are not intended to limit the scope of the present invention, and all equivalent changes or modifications accomplished under the technical spirit suggested by the present invention should fall within the scope of the present invention.
Claims (6)
1. The utility model provides a bridge cable power increment precision measurement device which characterized in that: comprises a cable force tester, a transmission layer and a display layer; the cable force tester comprises an upper clamping ring, a lower clamping ring, four connecting rods, four strain gauges, a temperature compensation strain gauge and a strain acquisition instrument, wherein the upper clamping ring and the lower clamping ring are parallel and opposite, a clamping through hole for a cable to pass through is formed in the middle of the upper clamping ring and the lower clamping ring, the aperture of the clamping through hole is slightly smaller than the diameter of the cable, the upper clamping ring and the lower clamping ring are connected through the four connecting rods, the four connecting rods are arranged at intervals and surround the periphery of the clamping through hole, each connecting rod is formed by connecting two force transmission rods and a deformation rod in series, the deformation rod is positioned between the two force transmission rods, the strain gauge is installed in the middle of each deformation rod, the temperature compensation strain gauge is installed in the middle of one of the four connecting rods, and the temperature compensation strain gauge and the four strain gauges are connected with the strain acquisition instrument; the transmission layer comprises a 4G/5G signal transmitter and a cloud end, and the strain acquisition instrument is connected with the cloud end through the 4G/5G signal transmitter; the display layer comprises terminal equipment, and the terminal equipment is in wireless connection with the cloud.
2. The bridge inhaul cable force increment accurate measurement device according to claim 1, wherein: the structure of going up clamp ring and clamp ring down is the same, go up the clamp ring and be the ring form to equally divide into two semicircle rings, the both ends on each semicircle ring arc length direction all weld the otic placode, have seted up the bolt hole on each otic placode, two semicircle rings connect into a ring through the mode that high strength bolt screw thread inserted the bolt hole, the inner ring of ring does the centre gripping through-hole.
3. The bridge inhaul cable force increment accurate measurement device according to claim 1, wherein: and a thread structure is carved on the hole wall of the clamping through hole.
4. The bridge inhaul cable force increment accurate measurement device according to claim 1, wherein: all the connecting rods are identical in length, all the dowel bars are made of alloy, and the cross sections of the dowel bars in the direction perpendicular to the length direction are of circular structures.
5. The bridge inhaul cable force increment accurate measurement device according to claim 1, wherein: all the deformation rods are made of alloy, the cross section of each deformation rod in the vertical length direction is of a rectangular structure, the size of the cross section is smaller than that of the cross section of the stay cable and that of the cross section of the dowel bar, and the elastic modulus of each deformation rod is smaller than that of the dowel bar.
6. The bridge inhaul cable force increment accurate measurement device according to claim 1, wherein: the terminal equipment is a computer, and the computer comprises a mobile phone and a tablet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021535969.6U CN213301544U (en) | 2020-07-29 | 2020-07-29 | Bridge inhaul cable force increment accurate measurement device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021535969.6U CN213301544U (en) | 2020-07-29 | 2020-07-29 | Bridge inhaul cable force increment accurate measurement device |
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| CN213301544U true CN213301544U (en) | 2021-05-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111855061A (en) * | 2020-07-29 | 2020-10-30 | 广西交科集团有限公司 | Bridge inhaul cable force increment accurate measurement device and measurement method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111855061A (en) * | 2020-07-29 | 2020-10-30 | 广西交科集团有限公司 | Bridge inhaul cable force increment accurate measurement device and measurement method |
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