CN105865696A - Inhaul cable force change testing device - Google Patents
Inhaul cable force change testing device Download PDFInfo
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- CN105865696A CN105865696A CN201610277644.4A CN201610277644A CN105865696A CN 105865696 A CN105865696 A CN 105865696A CN 201610277644 A CN201610277644 A CN 201610277644A CN 105865696 A CN105865696 A CN 105865696A
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- 238000012360 testing method Methods 0.000 title claims abstract description 61
- 230000008859 change Effects 0.000 title claims abstract description 38
- 239000000523 sample Substances 0.000 claims abstract description 53
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 230000001681 protective effect Effects 0.000 claims description 12
- 239000011888 foil Substances 0.000 claims description 9
- 238000013016 damping Methods 0.000 claims description 6
- 229920006334 epoxy coating Polymers 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
- 230000004907 flux Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000012031 short term test Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
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- 230000005284 excitation Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
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- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
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- 238000010998 test method Methods 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
- G01L5/10—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A stay cable force change testing device comprises a first stay cable clamp and a second stay cable clamp, wherein the first stay cable clamp and the second stay cable clamp are provided with internal clamping holes, the first stay cable clamp is provided with a probe base, and the probe base is fixed on the first stay cable clamp; the second inhaul cable holder is provided with a touch box which is fixed on the second inhaul cable holder; a probe is arranged between the touch pressing box and the probe base and is a hollow circular tube with two closed ends; the bottom end of the probe is fixed on the probe base, and the top end of the probe is connected with the touch pressing box; the dynamic strain acquisition instrument is connected with the contact pressure box through a transmission cable. The invention has wide application range, simple and convenient installation, high test precision and lower cost.
Description
Technical field
The present invention relates to the test device of a kind of drag-line component Suo Li measure of the change for field of civil engineering, be specifically related to a kind of test device of the dynamic measure of the change of Suo Li size of drag-line component during operation.
Background technology
The health status of its operation phase, as large-scale public infrastructure, is monitored being highly important by the large-span space structures such as large bridge structure and cable stayed grid structure such as suspension bridge, cable-stayed bridge, half-through arch bridge.As one of primary structure member most important in said structure system, the dynamic situation of change of drag-line component Suo Li size during runing is to analyze whether said structure system operation state meets the important foundation data of safety requirements.
In prior art, conventional Cable force test device has the test device utilizing Pressure gauge to measure, utilize determination of pressure sensor test device, utilize what frequency spectrum measured to test device, the test device tested device, utilize adhesion type fiber-optic grating sensor to measure utilizing magnetic flux to measure.
Wherein, the test device utilizing Pressure gauge to measure is when carrying out cable tension, oil gauge reading according to stretch-draw jack, directly calculate the Suo Li of drag-line, the Cable power that the method is measured is accurate, but owing to cable tension has been constructed, after removal stretch-draw jack, just cannot recycle the method and read Cable power, therefore not be suitable for the long term monitoring of Cable power.
The test device utilizing determination of pressure sensor is when drag-line installation, pressure transducer is installed between steel for wire drawing and drag-line anchoring part, by measuring the pressure size measurement Cable power that pressure transducer bears, this detection method is higher to the measuring accuracy of Cable power, the situation of change of the Suo Li size during being simultaneously applicable to the operation of drag-line component is tested, but pressure transducer involves great expense, and must be in drag-line construction period installation, therefore it is only used for some drag-lines of paying close attention to are carried out the detection of operation phase drag-line size variation, it is not used to not install the detection of the operation phase Suo Li size variation of the existing drag-line of pressure transducer simultaneously.
The test device utilizing frequency spectrum to measure is to utilize the acceleration transducer being firmly attached on drag-line, test drag-line vibration time-history curves under environmental excitation, solving inhaul cable vibration frequency by spectrum analysis, the function formula between the frequency of vibration of recycling drag-line and Suo Li tries to achieve Cable force value；The method testing cost is low, and Cable power measuring accuracy can meet engineering test requirement, but owing to method of testing is complicated, once test is the longest, it is impossible to meets the requirement of the sample frequency carrying out the inhaul cable operation dynamic measure of the change of period Suo Li size.
The test device utilizing magnetic flux to measure is to utilize drag-line STRESS VARIATION that the principle of its magnetic flux change can be caused to carry out cable tension test, the method needs the demarcation carrying out drag-line magnetic flux initial value and magnetic flux during drag-line installation with Cable power change relevance function formula, otherwise cannot be carried out the detection of operation phase Cable power, be the most also not particularly suited for the operation phase Suo Li measure of the change of the existing drag-line do not demarcated.
The test device utilizing adhesion type fiber-optic grating sensor to measure is to utilize to be firmly attached on drag-line, the fiber-optic grating sensor with certain gauge length measures the elongation of gauge length inhaul, and the function formula between recycling gauge length inhaul elongation and Suo Li change tries to achieve Cable power changing value；The method is applicable to the test that the operation device Suo Li of existing drag-line dynamically changes, but the axial rigidity of fiber bragg grating sensor self can cause test result to produce certain error, and the fiber-optic grating sensor of different manufacturers does not have versatility, need the most special supporting conciliation terminal, cause testing system cost high.
The measurement that above-mentioned Cable force test device dynamically changes for the Suo Li size of existing inhaul cable operation phase all has some limitations, in the safety monitoring of existing inhaul cable operation phase, implementation result is undesirable or costly, and adhesion type Cable force test device can bring additional axial constraint rigidity to drag-line in the past, measuring accuracy is caused to decline, it is difficult to extensively to apply.
Summary of the invention
The technical problem to be solved is, overcomes the deficiency of above-mentioned background technology, it is provided that a kind of applied widely, simple installation, and measuring accuracy is high, the Cable power change test device that expense is relatively low.
The present invention solves its technical problem and employed technical scheme comprise that, a kind of Cable power change test device, including the first drag-line clamper and the second drag-line clamper, described first drag-line clamper, the second drag-line clamper are provided with internal clamp hole, and described first drag-line clamper is provided with probe base；Described second drag-line clamper is provided with and presses box；Described pressing is provided with probe between box and probe base, described probe is the hollow circular-tube of closed at both ends；Probe bottom is fixed on probe base, and top is connected with pressing box；Being additionally provided with dynamic strain Acquisition Instrument, described dynamic strain Acquisition Instrument is connected with pressing box by transmission cable.
Further, it is additionally provided with totally enclosed protective cover, described first drag-line clamper, the second drag-line clamper, probe, probe base and press box and be positioned at protective cover.
Further, described first drag-line clamper, the internal clamp internal surface of hole of the second drag-line clamper are pasted with high-damping rubber pad.
Further, the thickness of described high-damping rubber pad is 0.15-0.20mm.
Further, the thickness of described high-damping rubber pad is 0.16-0.18mm.
Further, probe base is fixed on the first drag-line clamper by screw.
Further, press box to be fixed on the second drag-line clamper by screw.
Further, described first drag-line clamper include can mutually obvolvent first on grip block and first time grip block, form internal clamp hole on first after grip block and first time grip block obvolvent；Described second drag-line clamper include can mutually the second grip block of obvolvent and second time grip block, form internal clamp hole after grip block and second time grip block obvolvent on second；Described probe base is fixed on the side of grip block on first；The described box that presses is fixed on the side of grip block on second.
Further, box is pressed described in by pressing case base, pressing plate, resistance strain gage group, press box top board and form；The described case base that presses is fixed on the second drag-line clamper, two pieces press plate one end and are firmly connected with pressing case base, the other end is firmly connected with pressing box top board, being pasted with resistance strain gage group at two pieces of 1/4～1/6 long regional locations of plate pressing plate, described dynamic strain Acquisition Instrument is connected with resistance strain gage group by transmission cable；The top of described probe is connected with pressing box top board.
Further, protective cover has the aperture passed through for transmission cable.
Further, the thickness pressing plate described in is 0.10-0.15mm；The described thickness pressing box top board is 2.0-2.5mm.
Further, the thickness pressing plate described in is 0.12-0.14mm；The described thickness pressing box top board is 2.2-2.4mm.
Further, described resistance strain gage group surface-coated has epoxy coating.
Further, described in press box top board and be provided with and the pit of tips of probes form fit, described tips of probes is placed in the pit pressing box top board.
Further, described resistance strain gage group is made up of the temperature-compensating foil gauge testing foil gauge be perpendicular to test foil gauge.
The dynamic test of the Suo Li change of all kinds of drag-line components such as compared with prior art, advantages of the present invention is as follows: be applicable to suspension cable, hoist cable, can be used for the short-term test of drag-line it can also be used to the long term monitoring of drag-line, applied widely；Test drag-line will not be produced axial additional constraint rigidity, have the advantages that measuring accuracy height, simple installation and expense are relatively low, can effectively measure existing drag-line component dynamic situation of change of Suo Li size in the operation phase uses, in the safety monitoring of existing inhaul cable operation phase, implementation result is notable.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention.
Fig. 2 is the I-I drawing in side sectional elevation of embodiment illustrated in fig. 1.
Fig. 3 is the II-II drawing in side sectional elevation of embodiment illustrated in fig. 1.
Fig. 4 is the layout schematic diagram pressing resistance strain gage group on plate of embodiment illustrated in fig. 1.
Detailed description of the invention
Below in conjunction with the accompanying drawings and the present invention is described in further detail by specific embodiment.
With reference to Fig. 1, Fig. 2, the present embodiment includes the first drag-line clamper 2a and the second drag-line clamper 2b, described first drag-line clamper 2a, the second drag-line clamper 2b are provided with internal clamp hole, first drag-line clamper 2a, the internal clamp internal surface of hole of the second drag-line clamper 2b are pasted with the high-damping rubber pad 10 that 0.18mm is thick, when preventing drag-line clamper from holding drag-line 1 tightly damage drag-line 1 surface protecting layer；First drag-line clamper 2a is provided with probe base 11, and probe base 11 is fixed on the first drag-line clamper 2a by screw；Second drag-line clamper 2b is provided with and presses box 4, presses box 4 and is fixed on the second drag-line clamper 2b by screw；Pressing and be provided with probe 3 between box 4 and probe base 11, probe 3 is the hollow circular-tube of closed at both ends, uses indium steel to make, to reduce the variations in temperature impact on measuring accuracy；Probe 3 bottom is fixed on probe base 11, and top is connected with pressing box 4；Being additionally provided with dynamic strain Acquisition Instrument 7, dynamic strain Acquisition Instrument 7 is connected with pressing box 4 by transmission cable 6.
Being additionally provided with protective cover 5, the first drag-line clamper 2a, the second drag-line clamper 2b, probe 3, probe base 11 and press box 4 and be positioned at protective cover 5, protective cover 5 is full-closed structure, it is to avoid external environment is on drag-line clamper, probe 3 and presses box 4 and produces impact.The aperture passed through for transmission cable 6 is had on protective cover 5.
With reference to Fig. 2, the first drag-line clamper 2a include can mutually obvolvent first on grip block 8a and first time grip block 9a, formation internal clamp hole after grip block 8a and first time grip block 9a obvolvent on first；Second drag-line clamper 2b include can the second grip block 8b and second time grip block 9b of mutual obvolvent, form internal clamp hole after grip block 8b and second time grip block 9b obvolvent on second.Probe base 11 is located at the side of grip block 8a on first, and on first, the side of grip block 8a has screw, and probe base 11 is fixed on the side of grip block 8a on first by screw；Pressing box 4 and be located at the side of grip block 8b on second, on second, the side of grip block 8b has screw, presses box 4 and is fixed on the side of grip block 8b on second by screw.
With reference to Fig. 3, press box 4 by pressing case base 13, pressing plate 14, resistance strain gage group 16, press box top board 15 and form；Press case base 13 to be fixed on the second drag-line clamper 2b by screw, two pieces of thickness is that plate 14 one end that presses of 0.12mm is firmly connected with pressing case base 13, the other end is firmly connected with the box top board 15 that presses that thickness is 2.2mm, presses box top board 15 and uses high-strength aluminum alloy to make；Being pasted with resistance strain gage group 16 at two pieces of 1/4～1/6 long regional locations of plate pressing plate 14, resistance strain gage group 16 surface-coated has epoxy coating, and the service behaviour making resistance strain gage group 16 is steady in a long-term；Pressing box top board 15 and be provided with the pit mated with probe 3 end shape, probe 3 top is placed in the pit pressing box top board 15, makes to press between box top board 15 and probe 3 and is stably connected with；Dynamic strain Acquisition Instrument 7 is connected with resistance strain gage group 16 by transmission cable 6, and transmission cable 6 is the transmission signal vector between resistance strain gage group 16 and dynamic strain Acquisition Instrument 7, it is achieved the transmitting of strain testing signal.
With reference to Fig. 4, resistance strain gage group 16 is made up of test foil gauge 17 and the temperature-compensating foil gauge 18 being perpendicular to test foil gauge 17.
Dynamic strain Acquisition Instrument 7 is to receive resistance strain gage group 16 to feed back the terminal unit of the signal of telecommunication, has carried out secondary development on the basis of general resistance dynamic strain measuring instrument, and have automatic response signal resolving is Cable power changing value, and carries out the function stored.
During use, test drag-line 1 is made to pass from the internal clamp hole of the first drag-line clamper 2a, the second drag-line clamper 2b, being clamped by the first drag-line clamper 2a, the second drag-line clamper 2b, in the normal pitch set, the first drag-line clamper 2a and the second drag-line clamper 2b each holds test drag-line 1；Two drag-line clampers (the first drag-line clamper 2a and the second drag-line clamper 2b) spacing can be caused to change during test drag-line 1 Suo Li change, thus causing the bending curvature change pressing plate 14, the strain variation value pressing resistance strain gage group 16 on plate 14 passed through of bending curvature change pressing plate 14 reflects.
The computational methods of the Suo Li changing value of Cable power of the present invention change test device are: change the strain variation value pressing resistance strain gage group 16 on plate 14 caused according to two drag-line clampers (the first drag-line clamper 2a and the second drag-line clamper 2b) spacing, calculating Cable power changing value, computing formula is as follows:
△P=R×E×A×K(ε1) ×△ε1；
△ P is Cable power changing value；
R is Cable power correction factor；
E is drag-line elastic modelling quantity；
A is drag-line area of section；
K(ε1) it is that drag-line strains conversion coefficient；
△ε1Strain variation value for resistance strain gage group.
The installation method of the Cable power change test device of the present invention, comprises the steps:
A10, according to the gauged distance requirement between the first drag-line clamper 2a and the second drag-line clamper 2b, labelling the first drag-line clamper 2a and the second drag-line clamper 2b installation site accurately on test drag-line 1, in mark installment position, grip block 8a on the first of the first drag-line clamper 2a and first time grip block 9a split are connected, be allowed to test drag-line 1 of firmly holding with a firm grip；In mark installment position, grip block 8b on the second of the second drag-line clamper 2b and second time grip block 9b split are connected, be allowed to test drag-line 1 of firmly holding with a firm grip；
A20, box 4 will be pressed with screw it will be connected firmly on the second drag-line clamper 2b, with screw, probe base 11 is tentatively fixed on the first drag-line clamper 2a again, probe 3 top is made to be properly inserted in the pit pressing box top board 15, after making to press the flexural deformation that plate 14 generation is preset, probe base 11 is firmly secured on the first drag-line clamper 2a；
A30, transmission cable 6 is connected with the resistance strain gage group 16 pressed on plate 14, protective cover 5 is installed, by the first drag-line clamper 2a, the second drag-line clamper 2b, probe 3 with press box 4 and be enclosed in protective cover 5, transmission cable 6 passes protective cover 5 by default aperture；
A40, transmission cable 6 is connected with dynamic strain Acquisition Instrument 7, read and press the initial strain value of resistance strain gage group 16 on plate 14 as benchmark data, after setting the parameters such as sample frequency, by the strain variation value of follow-on test resistance strain gage group 16, the Suo Li change of test drag-line 1 can be continuously monitored.
The Cable power change test device of the present invention is applicable to suspension cable, and the dynamic test of the Suo Li change of all kinds of drag-line components such as hoist cable can be used for the short-term test of drag-line it can also be used to the long term monitoring of drag-line, applied widely.The Cable power change test device of the present invention will not produce additional axial constraint rigidity to test drag-line, have the advantages that measuring accuracy height, simple installation and expense are relatively low, can effectively measure existing drag-line component dynamic situation of change of Suo Li size in the operation phase uses, in the safety monitoring of existing inhaul cable operation phase, implementation result is notable.
Those skilled in the art can carry out various modifications and variations to the present invention, if these amendments and modification are within the scope of the claims in the present invention and equivalent technologies thereof, then these amendments and modification are also within protection scope of the present invention.
The prior art that the content not described in detail in description is known to the skilled person.
Claims (10)
1. a Cable power change test device, it is characterized in that: include the first drag-line clamper (2a) and the second drag-line clamper (2b), described first drag-line clamper (2a) and the second drag-line clamper (2b) are provided with internal clamp hole, and described first drag-line clamper (2a) is provided with probe base (11)；Described second drag-line clamper (2b) is provided with and presses box (4)；Described pressing is provided with probe (3) between box (4) and probe base (11), described probe (3) is the hollow circular-tube of closed at both ends；Probe (3) bottom is fixed on probe base (11), and top is connected with pressing box (4)；Being additionally provided with dynamic strain Acquisition Instrument (7), described dynamic strain Acquisition Instrument (7) is connected with pressing box (4) by transmission cable (6).
2. Cable power change test device as claimed in claim 1, it is characterized in that: be additionally provided with totally enclosed protective cover (5), described first drag-line clamper (2a), the second drag-line clamper (2b), probe (3), probe base (11) and press box (4) and be positioned at protective cover (5).
3. Cable power change test device as claimed in claim 1 or 2, it is characterised in that: the internal clamp internal surface of hole of described first drag-line clamper (2a) and the second drag-line clamper (2b) is pasted with high-damping rubber pad (10).
4. Cable power change test device as claimed in claim 3, it is characterised in that: the thickness of described high-damping rubber pad (10) is 0.15-0.20mm.
5. Cable power change test device as claimed in claim 1 or 2, it is characterized in that: described first drag-line clamper (2a) include can mutually obvolvent first on grip block (8a) and first time grip block (9a), form internal clamp hole on first after grip block (8a) and the obvolvent of first time grip block (9a)；Described second drag-line clamper (2b) include can mutually second grip block (8b) of obvolvent and second time grip block (9b), form internal clamp hole after grip block (8b) and the obvolvent of second time grip block (9b) on second；Described probe base (11) is fixed on the side of grip block on first (8a)；The described box (4) that presses is fixed on the side of grip block on second (8b).
6. Cable power change test device as claimed in claim 1 or 2, it is characterised in that press box (4) described in: by pressing case base (13), pressing plate (14), resistance strain gage group (16), press box top board (15) and form；The described case base (13) that presses is fixed on the second drag-line clamper (2b), two pieces press plate (14) one end and press case base (13) and be firmly connected, the other end is firmly connected with pressing box top board (15), being pasted with resistance strain gage group (16) at two pieces of 1/4～1/6 long regional locations of plate pressing plate (14), described dynamic strain Acquisition Instrument (7) is connected with resistance strain gage group (16) by transmission cable (6)；The top of described probe (3) is connected with pressing box top board (15).
7. Cable power change test device as claimed in claim 6, it is characterised in that the thickness pressing plate (14) described in: is 0.10-0.15mm；The described thickness pressing box top board (15) is 2.0-2.5mm.
8. Cable power change test device as claimed in claim 6, it is characterised in that: described resistance strain gage group (16) surface-coated has epoxy coating.
9. Cable power change test device as claimed in claim 6, it is characterised in that pressing box top board (15) described in: and be provided with the pit mated with probe (3) end shape, described probe (3) top is placed in the pit pressing box top board (15).
10. Cable power change test device as claimed in claim 6, it is characterised in that: described resistance strain gage group (16) is by test foil gauge (17) and is perpendicular to the temperature-compensating foil gauge (18) of test foil gauge (17) and forms.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610277644.4A CN105865696A (en) | 2016-04-29 | 2016-04-29 | Inhaul cable force change testing device |
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| CN201610277644.4A CN105865696A (en) | 2016-04-29 | 2016-04-29 | Inhaul cable force change testing device |
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Cited By (10)
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| CN106840482A (en) * | 2017-03-02 | 2017-06-13 | 招商局重庆交通科研设计院有限公司 | A kind of tension of prestressed tendon stress and stress under anchorage test device and its method of testing |
| CN107044897A (en) * | 2017-03-17 | 2017-08-15 | 华中科技大学 | A kind of portable large-tonnage Cable rope for ship device for measuring force |
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| CN109027622A (en) * | 2018-06-22 | 2018-12-18 | 苏交科集团检测认证有限公司 | For testing the fixation device and application method of fundamental frequency at flexible Cable Structure 1/3 |
| CN110646129A (en) * | 2019-09-12 | 2020-01-03 | 上海建工集团股份有限公司 | Resistance type inhaul cable force measuring device and method |
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| CN112964411A (en) * | 2021-02-07 | 2021-06-15 | 浙江大学 | Surface strain-based cable force measuring method and device for inhaul cable |
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