CN111337177A - Stay cable life cycle cable force testing device - Google Patents
Stay cable life cycle cable force testing device Download PDFInfo
- Publication number
- CN111337177A CN111337177A CN202010196843.9A CN202010196843A CN111337177A CN 111337177 A CN111337177 A CN 111337177A CN 202010196843 A CN202010196843 A CN 202010196843A CN 111337177 A CN111337177 A CN 111337177A
- Authority
- CN
- China
- Prior art keywords
- cable
- testing
- steel wire
- test
- force
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- G01L5/101—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 using sensors inserted into the flexible member
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a stay cable life-cycle cable force testing device, which comprises a stay cable consisting of a plurality of steel wires, wherein the steel wires comprise testing steel wires with surface insulation treatment; the end parts of the two test steel wires, which are positioned at one end of the inhaul cable, are communicated, and the other ends of the two test steel wires are electrically connected with the test device to form a test loop; the testing device obtains the cable force of the inhaul cable through the resistance value change of the testing steel wire in the testing loop. The cable force testing device for the full service life of the stay cable can test the cable force of the stay cable by using the stay cable as a measuring resistor, and the steel wire subjected to insulation treatment can achieve the purpose of testing the full service life.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a stay cable life-cycle cable force testing device.
Background
The cable is the important bearing component of cable-stay bridge, and the cable force of cable is unusual can effectively represent the atress situation's of structure unusual, to the real-time supervision of full-bridge cable force, as bridge structures health monitoring's important component, has important effect in the aspect of guaranteeing bridge structures whole atress safety and durability, consequently need carry out the cable force test to the life cycle of cable to construction and maintenance to the cable provide the basis.
The existing guy cable force testing method comprises a direct method and an indirect method, wherein the direct method comprises a fiber grating sensor strain method, a resistance strain gauge strain method and the like, the indirect method comprises a vibration frequency method, a magnetic flux method and the like, and the two methods have respective defects. The direct method has the disadvantages of being difficult to install and not ensuring the survival rate, and the indirect method has the disadvantages of converting the measured value and calibrating the cable force.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a stay cable life-cycle cable force testing device which can test the cable force in the life cycle of the stay cable, is convenient to install and is accurate in test.
In order to achieve the purpose, the invention is realized by the following technical scheme: a guy cable life-cycle cable force testing device comprises a guy cable consisting of a plurality of steel wires, wherein the steel wires comprise testing steel wires with surface insulation treatment; the end parts of the two test steel wires, which are positioned at one end of the inhaul cable, are communicated, and the other ends of the two test steel wires are electrically connected with the test device to form a test loop; the testing device obtains the cable force of the inhaul cable through the resistance value change of the testing steel wire in the testing loop.
After the steel wire is connected and forms the test circuit, the cable inhaul cable begins from the unstressed state, through the work and the overall process of demolising, all can be through the resistance variation of testing arrangement test steel wire to the extension of cable and the size of cable force are learnt in the test.
The beneficial effects of the device for testing the cable force of the stay cable in the whole life cycle are as follows: the steel wire after utilizing insulation treatment itself can survey the elongation of cable through the test steel wire as measuring resistance to this kind of mode simple to operate need not additionally to install the sensor, can both test the cable force in the full life-span.
Further, the cable force calculation formula of the stay cable is as follows: t iscable＝nEAεx，
Wherein, TcableIs the axial force of the stay cable, n is the number of the steel wires in the stay cable, E is the elastic modulus of the steel wires, A is the cross-sectional area of a single steel wire, epsilonxIs the axial strain of the cable.
Furthermore, the test steel wire is provided with 2j, j is a natural number, and the 2j test steel wires form j test loops.
Further, testing arrangement includes data acquisition device and analysis accounting device, data acquisition device set up at the tip of cable and with the tip electric connection of test steel wire, analysis accounting device and data acquisition device communication are connected.
Further, the analysis and calculation device is connected with the data acquisition device through wireless communication.
Further, still include solar energy power supply unit, solar energy power supply unit is connected with the data acquisition device electricity.
Further, the length of the steel wire is L, the resistivity of the steel wire is rho, the cross-sectional area of the steel wire is A, the original resistance of the steel wire is R, and
further, the axial strain of the stay cable is epsilonxThe length variation of the stay cable during the operation of the steel wire is dL, and the calculation mode of the axial strain of the stay cable is
Further, the radial strain of the stay cable is epsilonyThe diameter of the steel wire of the inhaul cable is D, the diameter variation of the steel wire of the inhaul cable during working is dD, and the calculation mode of the radial strain of the inhaul cable is that
Further, the relation between the radial strain and the axial strain of the inhaul cable is epsilony＝-uεxAnd u is the Poisson's ratio.
Drawings
FIG. 1 is a schematic view of the present invention;
reference numerals: 100-stay cable, 110-test steel wire, 200-data acquisition device, 300-analysis and calculation device and 400-solar power supply device.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby. In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like, which indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are used only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referenced components or structures must have a specific orientation, be constructed in a specific orientation, and be operated, and thus are not to be construed as limiting the present invention.
Referring to fig. 1, the present invention provides a cable life-time cable force testing device, including a cable 100 composed of a plurality of steel wires and a testing device, wherein the steel wires in the cable include a plurality of testing steel wires 110 with surface insulation treatment, and the cable force of the cable 100 can be obtained by changing the resistance value of the testing steel wires 110 through the testing device.
Specifically, the test wire 110 is provided with 2j, j being a natural number. The end portion, located at one end of the inhaul cable, of each two test steel wires 110 is communicated, the other end of each test steel wire 110 is electrically connected with the test device, a test loop is formed, so that j test loops can be formed by the 2j test steel wires 110 for testing, the average value is obtained after multiple groups of data are collected, and the accuracy of the data can be improved.
Specifically, the testing device includes a data collection device 200, an analysis and calculation device 300 and a solar power supply device 400, the data collection device 200 is disposed at an end of the cable and electrically connected to an end of the testing steel wire 110, the analysis and calculation device 300 is in communication connection with the data collection device 200, and in this embodiment, the analysis and calculation device 300 is in wireless communication connection with the data collection device 200. The solar power supply device 400 is electrically connected to the data acquisition device 200 to supply power to the data acquisition device 200.
When the inhaul cable is not stressed, the resistivity of the steel wire in the inhaul cable is set to be rho, the length of the steel wire is set to be L, the section area of a single steel wire is set to be A, and the calculation mode of the original resistance is as follows:
after the cable is used, the steel wire is elongated and deformed under the action of tensile force, the length L of the steel wire is increased, the cross-sectional area A is reduced, and the resistance of the steel wire is increased according to the calculation mode of the resistance. If the length of the steel wire is extended by dL, the cross section area is reduced by dA, the resistivity is changed by dp due to the deformation factor of the material crystal lattice, and the relative change of the resistance is as follows:
given a diameter D of the wire, a cross-sectional area can be obtained:
namely:
this gives:
when the unidirectional stress state is calculated, u is taken as the Poisson ratio, and the axial strain is epsilonxRadial strain εyCan obtain epsilony＝-uεx，
Thus, it is possible to obtain:
namely:
if the elastic constant of the steel wire is C and the volume of the steel wire is V, the relationship between the change of the resistivity of the steel wire and the change of the volume of the steel wire is as follows:
since the volume V is calculated in the following way: v ═ AL, therefore, we can obtain:
namely:
substitution can obtain:
let the sensitivity coefficient of the steel wire be KsThe calculation method of the sensitivity coefficient is as follows:
this gives: ks＝[1+2u+C(1-2u)]。
Setting the cable force of the stay cable as TcableThe number of the steel wires tested in the stay cable is n, the elastic modulus of the steel wires is E, and the cable force calculation mode of the stay cable is Tcable＝nEAεxAnd calculating the cable force of the cable by substituting the axial strain of the cable.
The working principle of the stay cable life-cycle cable force testing device is as follows: every two test steel wires 110 subjected to insulation processing in the cable 100 form a test loop, the end parts of one ends of the two test steel wires 110 are communicated, the other ends of the two test steel wires 110 are electrically connected with the data acquisition device 200, and after data are acquired through the data acquisition device 200, the data are transmitted to the analysis and calculation device 300 through wireless communication, so that the cable force of the cable 100 is calculated.
Use above-mentioned cable life cycle cable force testing arrangement, can utilize the cable itself as measuring resistance, need not additionally to increase the sensor to the cable is at the deformation in-process, and the steel wire atress in coordination changes through the resistance value of test steel wire, thereby measures the elongation of cable, need not revise again.
Through insulation treatment's steel wire, can ensure that the resistance of steel wire self does not change, consequently can reach the purpose to the test of stay cable life cycle cable force to through setting up a plurality of closed circuit, can improve the redundancy of measurement, can both test the cable force in the assurance life cycle.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The utility model provides a cable life cycle cable force testing arrangement, includes the cable that a plurality of steel wires are constituteed, its characterized in that: the steel wire comprises a test steel wire with surface insulation treatment; the end parts of the two test steel wires, which are positioned at one end of the inhaul cable, are communicated, and the other ends of the two test steel wires are electrically connected with the test device to form a test loop; the testing device obtains the cable force of the inhaul cable through the resistance value change of the testing steel wire in the testing loop.
2. The device for testing the life cycle cable force of the inhaul cable according to claim 1, wherein: the cable force calculation formula of the inhaul cable is as follows: t iscable＝nEAεx，
Wherein, TcableIs the axial force of the stay cable, n is the number of the steel wires in the stay cable, E is the elastic modulus of the steel wires, A is the cross-sectional area of a single steel wire, epsilonxIs the axial strain of the cable.
3. A cable life cycle cable force testing device as claimed in claim 1 or claim 2, wherein: the test steel wire is provided with 2j, j is the natural number, 2j the test steel wire forms j test return circuit.
4. The device for testing the life cycle cable force of the inhaul cable according to claim 1, wherein: the testing device comprises a data acquisition device and an analysis and calculation device, wherein the data acquisition device is arranged at the end part of the inhaul cable and is electrically connected with the end part of the test steel wire, and the analysis and calculation device is in communication connection with the data acquisition device.
5. The device for testing the life cycle cable force of the inhaul cable according to claim 4, wherein: the analysis and calculation device is connected with the data acquisition device through wireless communication.
6. The device for testing the life cycle cable force of the inhaul cable according to claim 4, wherein: the solar energy power supply device is electrically connected with the data acquisition device.
7. The device for testing the life cycle cable force of the inhaul cable according to claim 1, wherein the length of the steel wire is L, the resistivity of the steel wire is p, the cross-sectional area of the steel wire is A, the original resistance of the steel wire is R, and
8. the device for testing the life cycle cable force of the inhaul cable according to claim 7, wherein the axial strain of the inhaul cable is epsilonxThe length variation of the stay cable during the operation of the steel wire is dL, and the calculation mode of the axial strain of the stay cable is
9. The device for testing the life cycle cable force of the inhaul cable according to claim 8, wherein the radial strain of the inhaul cable is epsilonyThe diameter of the steel wire of the inhaul cable is D, the diameter variation of the steel wire of the inhaul cable during working is dD, and the calculation mode of the radial strain of the inhaul cable is that
10. The device for testing the life cycle cable force of the inhaul cable according to claim 9, wherein the relation between the radial strain and the axial strain of the inhaul cable is epsilony＝-uεxAnd u is the Poisson's ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010196843.9A CN111337177A (en) | 2020-03-19 | 2020-03-19 | Stay cable life cycle cable force testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010196843.9A CN111337177A (en) | 2020-03-19 | 2020-03-19 | Stay cable life cycle cable force testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111337177A true CN111337177A (en) | 2020-06-26 |
Family
ID=71184139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010196843.9A Pending CN111337177A (en) | 2020-03-19 | 2020-03-19 | Stay cable life cycle cable force testing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111337177A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101013056A (en) * | 2006-12-27 | 2007-08-08 | 广州大学 | Steel cable stretching force detecting apparatus |
| CN105158300A (en) * | 2015-09-17 | 2015-12-16 | 中铁大桥科学研究院有限公司 | Detection method for bridge linear steel member |
| CN107966228A (en) * | 2016-10-19 | 2018-04-27 | 南京智行信息科技有限公司 | A kind of intelligent wireless cable force monitoring system and monitoring method |
| 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 |
-
2020
- 2020-03-19 CN CN202010196843.9A patent/CN111337177A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101013056A (en) * | 2006-12-27 | 2007-08-08 | 广州大学 | Steel cable stretching force detecting apparatus |
| CN105158300A (en) * | 2015-09-17 | 2015-12-16 | 中铁大桥科学研究院有限公司 | Detection method for bridge linear steel member |
| CN107966228A (en) * | 2016-10-19 | 2018-04-27 | 南京智行信息科技有限公司 | A kind of intelligent wireless cable force monitoring system and monitoring method |
| 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 |
Non-Patent Citations (2)
| Title |
|---|
| 中国海洋工程学会: "《第十五届中国海洋（岸）工程学术讨论会论文集 中》", 31 July 2011 * |
| 海涛: "《现代检测技术》", 31 August 2011, 重庆大学出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106500900B (en) | A kind of Cable force measuring device and its measurement method | |
| CN203758658U (en) | Transmission line mechanics monitoring digit sensor | |
| CN101368856B (en) | Giant stamp forging hydraulic press upright post stress harvester and stress monitoring system | |
| CN107917773A (en) | A kind of pipe stick material residual stress is without impression device for measurement of strain and method | |
| CN103399049A (en) | Concrete cracking monitoring method based on tensile sensitive effect of conductive polymer | |
| CN101936754A (en) | On-line self-correcting method of measuring data of dam safety monitoring automated data acquisition device | |
| CN208060134U (en) | Compression spring fatigue tester | |
| CN105158300A (en) | Detection method for bridge linear steel member | |
| CN108801205A (en) | A kind of sensitivity calibration device and scaling method of strain transducer | |
| CN113188745A (en) | Method and device for testing wind load of crown of standing tree | |
| CN1818643A (en) | Pressure-sensitive performance testing method of pressure-sensitive cement-base materials | |
| CN101482391B (en) | Reinforced belt deformation test device and test method | |
| CN108106517A (en) | A kind of method of long-range monitoring tree diameters increment | |
| CN111337177A (en) | Stay cable life cycle cable force testing device | |
| CN117704949A (en) | Structure crack identification monitoring system and method based on wide-range strain sensing element | |
| CN108801784A (en) | A kind of carbon nano tube compound material structural healthy monitoring system | |
| CN109520922A (en) | A kind of test device and test method of bolt coefficient of friction and torque coefficient | |
| CN110553576B (en) | Spiral strain testing device and method for extrusion-molded fiber reinforced fabric rib | |
| CN108645372B (en) | Large-span transmission conductor suspension point dynamic bending strain measurement method | |
| CN107219033B (en) | Assembled anchor dynamometer and application method | |
| CN110411332A (en) | A kind of system and method for test resistance gauge factor | |
| CN114543694B (en) | Wide-range panel parting measuring device | |
| CN202748234U (en) | Power transmission iron tower intensity and vibration off-line intelligent inspection tour system | |
| CN102831665B (en) | Power transmission tower intensity and vibration off-line intelligent routing inspection system and early warning method thereof | |
| CN201544430U (en) | Clamping force measuring device for injection molding machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200626 |