CN110646129A - Resistance type inhaul cable force measuring device and method - Google Patents
Resistance type inhaul cable force measuring device and method Download PDFInfo
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- CN110646129A CN110646129A CN201910863284.XA CN201910863284A CN110646129A CN 110646129 A CN110646129 A CN 110646129A CN 201910863284 A CN201910863284 A CN 201910863284A CN 110646129 A CN110646129 A CN 110646129A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 57
- 239000010959 steel Substances 0.000 claims abstract description 57
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 238000004364 calculation method Methods 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 7
- 239000012790 adhesive layer Substances 0.000 claims description 6
- 229920006334 epoxy coating Polymers 0.000 claims description 5
- 239000011810 insulating material Substances 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 claims 1
- 239000004698 Polyethylene Substances 0.000 description 4
- 238000004873 anchoring Methods 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 239000010410 layer Substances 0.000 description 3
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- 101100356682 Caenorhabditis elegans rho-1 gene Proteins 0.000 description 2
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- 239000000945 filler Substances 0.000 description 1
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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
- G01L5/103—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 fixed at one end of the flexible member
Abstract
The invention discloses a resistance type inhaul cable force measuring device and method, and relates to the technical field of resistance measurement. The method aims to solve the problem that an accurate cable force value cannot be obtained due to the fact that an existing cable force measuring method is easily influenced by an external environment. The cable tension measuring device comprises a plurality of conductive buckles, two measuring wires, a thermistor and a data acquisition instrument, wherein the conductive buckles are arranged on the outer surface of the cable along the axial direction of the cable at intervals, each conductive buckle is connected with two adjacent steel wire bundles in the cable respectively, a plurality of steel wire bundles which are arranged continuously are connected in series through the conductive buckles to form a cable measuring unit, one end of each measuring wire is connected with the two conductive buckles at the two ends of the cable measuring unit, the other end of each measuring wire is connected with the data acquisition instrument, the thermistor is arranged on one measuring wire, the data acquisition instrument acquires the resistance values of the cable measuring unit and the thermistor, the relationship formula of the resistance value of the cable and the cable tension is deduced, the resistance value measured before and after the cable is combined, and the cable tension of the cable.
Description
Technical Field
The invention relates to the technical field of resistance measurement, in particular to a resistance type inhaul cable force measuring device and method.
Background
The bearing capacity of the large-span bridge and the structure are improved through a prestress system, prestress is mainly achieved through tensioning prestress steel strands and steel strand inhaul cables, the steel strand inhaul cables serve as main stress components of the large-span cable-stayed bridge, and the measurement of the cable force is particularly important.
At present, two methods are mainly used for measuring the cable force of a steel strand stay, one method is a frequency method, the vibration frequency of the whole bundle of steel strand stay is measured, and the cable force value of the steel strand stay is calculated according to the relation between the vibration frequency of the steel strand stay and the cable force, but the method is easily interfered by external environmental factors, the real vibration frequency of the steel strand stay is difficult to measure, especially when the constraint boundaries of the anchoring ends at the two ends of the steel strand stay are not clear, the relation between the vibration frequency of the steel strand stay and the cable force is difficult to determine, and the accurate cable force value cannot be calculated; the other method is to measure the induced voltage of the steel strand inhaul cable by utilizing the magneto-elastic effect and calculate the cable force value of the steel strand inhaul cable according to the relation between the induced voltage and the cable force.
Disclosure of Invention
The method aims to solve the problem that an accurate cable force value cannot be obtained due to the fact that an existing method for measuring the cable force of the steel strand stay cable is easily influenced by the external environment. The invention aims to provide a resistance type inhaul cable force measuring device and a method, which are used for calculating the inhaul cable force by deducing a relation formula of the resistance value of an inhaul cable and the inhaul cable force and combining the resistance value and the resistivity measured before and after the inhaul cable is tensioned.
The technical scheme adopted by the invention for solving the technical problem is that the resistance type inhaul cable force measuring device comprises:
the conductive buckles are arranged on the outer surface of the inhaul cable at intervals along the axial direction of the inhaul cable, and each conductive buckle is respectively connected with two adjacent steel wire bundles in the inhaul cable, so that the steel wire bundles which are continuously arranged are connected in series through the conductive buckles to form an inhaul cable measuring unit;
the measuring device comprises two measuring wires, one measuring wire is connected with a conductive buckle at one end of the inhaul cable measuring unit, and the other measuring wire is connected with a conductive buckle at the other end of the inhaul cable measuring unit;
a thermistor mounted on one of the measurement leads;
and the data acquisition instrument is respectively connected with the other ends of the two measuring wires.
The invention relates to a resistance-type inhaul cable force measuring device, which comprises a plurality of conductive buttons, two measuring wires, a thermistor and a data acquisition instrument, wherein the conductive buttons are arranged on the outer surface of an inhaul cable at intervals along the axial direction of the inhaul cable, each conductive button is respectively connected with two adjacent steel wire bundles in the inhaul cable, so that the steel wire bundles which are continuously arranged are connected in series through the conductive buttons to form an inhaul cable measuring unit, one end of each measuring wire is connected with the two conductive buttons at the two ends of the inhaul cable measuring unit, the other end of each measuring wire is connected with the data acquisition instrument, the thermistor is arranged on one measuring wire, the data acquisition instrument acquires the resistance value of the inhaul cable measuring unit and the resistance value of the thermistor and calculates the internal temperature of the inhaul cable, and the inhaul cable force is calculated by deducing a relation formula of the resistance value of, the device simple structure, easily dismouting, the process of measuring the resistance value of cable measuring unit moreover does not receive external environment factor's influence for the cable force value of calculating is more accurate. The invention is mainly applied to the cable force measurement of the steel strand inhaul cable.
Preferably, the conductive buckle comprises a bar-shaped base and a wire, the bar-shaped base is made of an insulating material, the wire is U-shaped, the horizontal portion of the wire is embedded in the bar-shaped base, the vertical portions at the two ends of the wire extend out of the bar-shaped base, a contact head is mounted at the end of each vertical portion, and the contact head can penetrate through an epoxy coating on the outer portion of the steel wire bundle, so that two adjacent steel wire bundles are connected in series.
Preferably, one side of the strip-shaped base, which is close to the contact, is further provided with a rubber adhesive layer.
In addition, the invention also provides a resistance type inhaul cable force measuring method, which comprises the following steps:
s1: installing a resistance type inhaul cable force measuring device on the outer side of an inhaul cable, installing a plurality of conductive buckles on the outer surface of the inhaul cable at intervals along the axial direction of the inhaul cable, and connecting each conductive buckle with two adjacent steel wire bundles in the inhaul cable respectively, so that the steel wire bundles which are continuously arranged are connected in series through the conductive buckles to form an inhaul cable measuring unit, the inhaul cable measuring unit is connected with a data acquisition instrument through two measuring wires, and a thermistor is installed on one measuring wire;
s2: before the guy cable is stretched, measuring an initial resistance value Rpull 0 of the guy cable measuring unit, measuring resistance value Rheat of the thermistor, calculating the temperature of the thermistor according to the relation between the resistance value and the temperature of the thermistor to obtain the temperature T0 inside the guy cable, and calculating the guy cable resistivity rho 0 at the temperature T0 according to the material type of the guy cable;
s3: after the guy cable is stretched, measuring the measuring resistance value Rpull 1 of the guy cable measuring unit and the resistance value Rhot' of the thermistor, then calculating the temperature T1 inside the guy cable, and calculating the guy cable resistivity rho 1 under the temperature T1 according to the material type of the guy cable;
s4: according to a resistivity calculation formula and a calculation formula of the elongation of the stay cable after stress, a calculation formula between the resistance value of the stay cable and the cable force is deduced as follows:
wherein F is the cable force of the stay cable;
r0 is the initial resistance value of the inhaul cable measuring unit;
r1 is the measured resistance value of the inhaul cable measuring unit;
rho 0 is the cable resistivity at the cable internal temperature T0;
e is the elastic modulus of the stay cable;
a is the cross-sectional area of the stay cable.
The invention relates to a method for measuring the cable force of a resistance-type inhaul cable, which comprises the following steps of firstly, installing a resistance-type inhaul cable force measuring device, installing a plurality of conductive buttons on the outer surface of the inhaul cable along the axial direction of the inhaul cable at intervals, respectively connecting each conductive button with two adjacent steel wire bundles in the inhaul cable, connecting a plurality of continuously arranged steel wire bundles in series through the conductive buttons to form an inhaul cable measuring unit, connecting the inhaul cable measuring unit with a data acquisition instrument through a measuring lead, installing a thermistor on one measuring lead, respectively measuring the initial resistance value and the measured resistance value of the inhaul cable measuring unit before and after the inhaul cable is stretched, calculating the inhaul cable resistivity at different temperatures according to different thermistor values before and after the inhaul cable is stretched, and finally; the variables in the calculation formula are only the resistance value of the stay cable measuring unit and the electric resistivity of the stay cable, compared with the vibration frequency, the induction electric response and the like adopted in the existing calculation method, the measuring process of the resistance values of the stay cable measuring unit and the thermistor is less influenced by the external environment, the derivation process between the resistance value of the thermistor and the electric resistivity of the stay cable is definite and simple, and the accuracy of the calculation of the cable force of the stay cable is facilitated; in addition, the measuring method of the invention does not need to consider the anchoring boundary conditions at the two ends of the stay cable, has less interference factors, further ensures the accuracy of cable force calculation of the stay cable and improves the efficiency.
Preferably, in step S4, the calculation formula of the resistivity is: p is RA/L, wherein,
ρ is resistivity in Ω · m;
a is the cross section area of the inhaul cable, and a square meter is used;
r is the resistance value of the stay cable and the unit omega;
l is the cable length in m.
Preferably, in step S4, the formula for calculating the elongation of the cable after being subjected to the force is: Δ L ═ F × L/(E × a), wherein,
f is the cable force of the inhaul cable in the unit of N;
e is the elastic modulus of the stay cable;
a is the cross-sectional area of the stay cable;
l is the length of the stay cable;
and Delta L is the elongation of the inhaul cable after being stressed.
Preferably, in the step S1, the strip base is attached to the outer surface of the cable by a rubber adhesive layer disposed on a side close to the contact.
Drawings
FIG. 1 is a cross-sectional view of a cable;
FIG. 2 is a cross-sectional view of a cable with a conductive buckle mounted thereon;
FIG. 3 is a schematic structural diagram of the resistance-type cable force measuring device according to the present invention;
fig. 4 is a schematic structural view of a conductive buckle of the resistance-type cable force measuring device of the present invention.
The numbers in the figures are as follows:
a steel wire bundle 1; an epoxy coating 2; a filler 3; hot-extruding a polyethylene layer 4; a conductive button 11; a measuring wire 12; a thermistor 14; a data line 15; a data acquisition instrument 16; a strip-shaped base 11 a; a conductive line 11 b; contact 11 c.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. For convenience of description, the directions of "up" and "down" described below are the same as the directions of "up" and "down" in the drawings, but this is not a limitation of the technical solution of the present invention.
Example 1
The common inhaul cable system mainly comprises two systems, wherein one system is a hot extrusion Polyethylene (PE) protected parallel steel wire bundle 1 matched with a cold casting heading anchor inhaul cable system; the other is a steel strand bundle consisting of single stranded steel strands protected by hot extrusion polyethylene, the outer layer of the whole bundle is a high-density polyethylene protective sleeve formed by double-layer synchronous extrusion molding, and two ends of the whole bundle are provided with single anchoring clip type anchors to form a group anchor steel strand inhaul cable system. As shown in fig. 1, the present embodiment is described by taking the former cable with parallel steel wire bundles 1 as an example, the steel strand of the cable generally consists of 7 steel wire bundles 1 which are parallelly folded, 1 steel wire bundle 1 is at the center, the other 6 steel wire bundles 1 surround the outer side along the circumferential direction, and the outer side of each steel wire bundle 1 is wrapped with an insulating epoxy coating 2. The resistance type inhaul cable force measuring device of the invention is described below with reference to fig. 2 to 4, and comprises:
the cable comprises a plurality of conductive buckles 11, wherein the conductive buckles 11 are arranged on the outer surface of the cable at intervals along the axial direction of the cable, each conductive buckle 11 is respectively connected with two adjacent steel wire bundles 1 in the cable, so that the steel wire bundles 1 which are continuously arranged are connected in series through the conductive buckles 11 to form a cable measuring unit, in the embodiment, 3 conductive buckles 11 are arranged on the cable, so that 4 steel wire bundles 1 which are continuously arranged form a series-connected passage, the number of the conductive buckles 11 is set according to the measuring requirement, and the arrangement is only an example;
the cable measuring device comprises two measuring wires 12, wherein one measuring wire 12 is connected with a conductive buckle 11 positioned at one end of a cable measuring unit, and the other measuring wire 12 is connected with a conductive buckle 11 positioned at the other end of the cable measuring unit;
a thermistor 14 mounted on one of the measuring wires 12;
and the data acquisition instrument 16 is respectively connected with the other ends of the two measuring leads 12.
The invention relates to a resistance type inhaul cable force measuring device, which comprises a plurality of conductive buttons 11, two measuring leads 12, a thermistor 14 and a data acquisition instrument 16, wherein the plurality of conductive buttons 11 are arranged on the outer surface of an inhaul cable at intervals along the axial direction of the inhaul cable, each conductive button 11 is respectively connected with two adjacent steel wire bundles 1 in the inhaul cable, so that the steel wire bundles 1 which are continuously arranged are connected in series through the conductive buttons 11 to form an inhaul cable measuring unit, one end of each measuring lead 12 is connected with the two conductive buttons 11 at the two ends of the inhaul cable measuring unit, the other end of each measuring lead is connected with the data acquisition instrument 16, the thermistor 14 is arranged on one measuring lead 12, the data acquisition instrument 16 acquires the resistance value of the inhaul cable measuring unit and the resistance value of the thermistor 14, calculates the internal temperature of the inhaul cable, calculates the relation formula of the resistance value of the inha, thereby calculate the cable force of cable, the device simple structure, easily dismouting, the process of measuring the resistance value of cable measuring unit is not influenced by external environment factor moreover for the cable force value of calculating is more accurate. The invention is mainly applied to the cable force measurement of the steel strand inhaul cable.
As shown in fig. 4, the conductive buckle 11 of the present embodiment includes a bar-shaped base 11a and a wire 11b, the bar-shaped base 11a is made of an insulating material, the wire 11b is U-shaped, a horizontal portion of the wire 11b is embedded in the bar-shaped base 11a, vertical portions of two ends of the wire 11b extend outside the bar-shaped base 11a, and a contact 11c is mounted at an end of the vertical portion, and the contact 11c can penetrate through the epoxy coating 2 outside the steel wire bundle 1, so that two adjacent steel wire bundles 1 are connected in series.
Preferably, the strip-shaped base 11a is further provided with a rubber adhesive layer on one side close to the contact 11c, so that the conductive buckle 11 can be firmly adhered to the outer surface of the cable, and the stable connection between the contact 11c and the steel wire bundle 1 is ensured.
Example 2
The method for measuring the resistance-type inhaul cable force of the invention is described by combining the figures 1 to 4, and comprises the following specific steps:
s1: installing the resistance type inhaul cable force measuring device according to embodiment 1 on the outer side of an inhaul cable, installing 3 conductive buttons 11 on the outer surface of the inhaul cable at intervals along the radial direction of the axis of the inhaul cable, and connecting each conductive button 11 with two adjacent steel wire bundles 1 in the inhaul cable respectively, so that 4 continuously arranged steel wire bundles 1 are connected in series through the conductive buttons 11 to form an inhaul cable measuring unit, connecting the inhaul cable measuring unit with a data acquisition instrument 16 through two measuring wires 12, and installing a thermistor 14 on one measuring wire 12;
s2: before the guy cable is stretched (before stress), measuring the initial resistance value R of the guy cable measuring unitPulling device 0Resistance value R of a guy wire measuring unit formed of a plurality of wire bundles 1 connected in seriesPulling deviceΣ Ri, and the resistance value R of the thermistor 14 is measuredHeat generationAccording to the relation between the resistance value of the thermistor 14 and the temperatureThe temperature of the thermistor 14 is calculated to obtain the temperature T inside the cable0The temperature T can be calculated according to the material type of the inhaul cable0Lower cable resistivity ρ0；
S3: after the guy cable is stretched (stressed), measuring the measuring resistance value R of the guy cable measuring unitPulling device 1And the resistance value R of the thermistor 14Heat generation' and then deducing the temperature T inside the stay1The temperature T can be calculated according to the material type of the inhaul cable1Lower cable resistivity ρ1；
S4: according to a resistivity calculation formula and a calculation formula of the elongation of the stay cable after stress, a calculation formula between the resistance value of the stay cable and the cable force is deduced as follows:
wherein F is the cable force of the stay cable;
Rpulling device 0The initial resistance value of the cable measuring unit is obtained;
Rpulling device 1Measuring resistance value of the inhaul cable measuring unit;
ρ0is the internal temperature T of the stay cable0The lower cable resistivity;
ρ1is the internal temperature T of the stay cable1The lower cable resistivity;
e is the elastic modulus of the stay cable;
a is the cross-sectional area of the stay cable.
The resistance value R measured before and after the tension of the guy cable in the steps S2 and S3 is measuredPulling device 0、RPulling device 1Resistivity p0、ρ1And a constant E, A is substituted into the above formula one to obtain the cable force value of the cable.
The invention relates to a resistance-type inhaul cable force measuring method, which comprises the steps of firstly, installing a resistance-type inhaul cable force measuring device, installing a plurality of conductive buttons 11 on the outer surface of an inhaul cable at intervals along the radial direction of the axis of the inhaul cable, and respectively connecting each conductive button 11 with two adjacent steel wire bundles 1 in the inhaul cable, so that a plurality of continuously arranged steel wire bundles 1 are connected in series through the conductive buttons 11 to form an inhaul cable measuring unit, connecting the inhaul cable measuring unit with a data acquisition instrument 16 through a measuring lead 12, installing a thermistor 14 on one measuring lead 12, then respectively measuring the initial resistance value and the measured resistance value of the inhaul cable measuring unit before and after the inhaul cable is stretched, calculating the inhaul cable resistivity under different temperatures according to different thermistor 14 values before and after the inhaul cable is stretched, and; the variables in the calculation formula are only the resistance value of the stay cable measuring unit and the electric resistivity of the stay cable, compared with the vibration frequency, the induction electric response and the like adopted in the existing calculation method, the measuring process of the resistance values of the stay cable measuring unit and the thermistor 14 is less influenced by the external environment, the derivation process between the resistance value of the thermistor 14 and the electric resistivity of the stay cable is clear and simple, and the calculation accuracy of the electric resistance of the stay cable is facilitated; in addition, the measuring method of the invention does not need to consider the anchoring boundary conditions at the two ends of the stay cable, has less interference factors, further ensures the accuracy of cable force calculation of the stay cable and improves the efficiency.
In step S4, the resistivity calculation formula is: p is RA/L, wherein,
ρ is resistivity in Ω · m;
a is the cross section area of the inhaul cable, and a square meter is used;
r is the resistance value of the stay cable and the unit omega;
l is the cable length in m.
In step S4, the formula for calculating the elongation of the cable after being subjected to a force: Δ L ═ F × L/(E × a), wherein,
f is the cable force of the inhaul cable in the unit of N;
e is the elastic modulus of the stay cable;
a is the cross-sectional area of the stay cable;
l is the length of the stay cable;
and Delta L is the elongation of the inhaul cable after being stressed.
In the step S2, the temperature of the thermistor 14 is calculated according to the relationship between the resistance value and the temperature of the thermistor 14, and the cable resistivity ρ at a certain cable internal temperature T is calculated according to the type of the cable material, which are the prior art contents, and will not be described herein again.
In the step S1, the strip-shaped base 11a is adhered to the outer surface of the cable through the rubber adhesive layer disposed on the side close to the contact 11c, so that the conductive button 11 is firmly adhered to the outer surface of the cable, thereby ensuring stable connection between the contact 11c and the steel wire bundle 1.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (7)
1. A resistance-type inhaul cable force measuring device is characterized by comprising:
the conductive buckles are arranged on the outer surface of the inhaul cable at intervals along the axial direction of the inhaul cable, and each conductive buckle is respectively connected with two adjacent steel wire bundles in the inhaul cable, so that the steel wire bundles which are continuously arranged are connected in series through the conductive buckles to form an inhaul cable measuring unit;
the measuring device comprises two measuring wires, one measuring wire is connected with a conductive buckle at one end of the inhaul cable measuring unit, and the other measuring wire is connected with a conductive buckle at the other end of the inhaul cable measuring unit;
a thermistor mounted on one of the measurement leads;
and the data acquisition instrument is respectively connected with the other ends of the two measuring wires.
2. The resistive tension cable force measurement device of claim 1, wherein: the conductive buckle comprises a bar-shaped base and a lead, the bar-shaped base is made of an insulating material, the lead is U-shaped, the horizontal portion of the lead is embedded in the bar-shaped base, the vertical portions of the two ends of the lead extend out of the bar-shaped base, a contact head is installed at the end portion of the vertical portion, and the contact head can penetrate through an epoxy coating on the outer portion of the steel wire bundle, so that the two adjacent steel wire bundles are connected in series.
3. The resistive tension cable force measurement device of claim 2, wherein: and a rubber adhesive layer is also arranged on one side of the strip-shaped base, which is close to the contact head.
4. A resistance type inhaul cable force measuring method is characterized by comprising the following steps:
s1: installing a resistance type inhaul cable force measuring device on the outer side of an inhaul cable, installing a plurality of conductive buckles on the outer surface of the inhaul cable at intervals along the axial direction of the inhaul cable, and connecting each conductive buckle with two adjacent steel wire bundles in the inhaul cable respectively, so that the steel wire bundles which are continuously arranged are connected in series through the conductive buckles to form an inhaul cable measuring unit, the inhaul cable measuring unit is connected with a data acquisition instrument through two measuring wires, and a thermistor is installed on one measuring wire;
s2: before the guy cable is stretched, measuring the initial resistance value R of the guy cable measuring unitPulling device 0And measuring the resistance value R of the thermistorHeat generationCalculating the temperature of the thermistor according to the relationship between the resistance value and the temperature of the thermistor to obtain the temperature T in the inhaul cable0The temperature T can be calculated according to the material type of the inhaul cable0Lower cable resistivity ρ0；
S3: after the guy cable is tensioned, measuring the measuring resistance value R of the guy cable measuring unitPulling device 1And resistance value R of thermistorHeat generation' and then deducing the temperature T inside the stay1The temperature T can be calculated according to the material type of the inhaul cable1Lower cable resistivity ρ1；
S4: according to a resistivity calculation formula and a calculation formula of the elongation of the stay cable after stress, a calculation formula between the resistance value of the stay cable and the cable force is deduced as follows:
wherein F is the cable force of the stay cable;
Rpulling device 0The initial resistance value of the cable measuring unit is obtained;
Rpulling device 1Measuring resistance value of the inhaul cable measuring unit;
ρ0is the internal temperature T of the stay cable0The lower cable resistivity;
ρ1is the internal temperature T of the stay cable1The lower cable resistivity;
e is the elastic modulus of the stay cable;
a is the cross-sectional area of the stay cable.
5. The method of claim 4, wherein the method comprises the following steps: in step S4, the calculation formula of the resistivity is: p is RA/L, wherein,
ρ is resistivity in Ω · m;
a is the cross section area of the inhaul cable, and a square meter is used;
r is the resistance value of the stay cable and the unit omega;
l is the cable length in m.
6. The method of claim 4, wherein the method comprises the following steps: in step S4, a formula for calculating the elongation of the cable after being subjected to a force is: Δ L ═ F × L/(E × a), wherein,
f is the cable force of the inhaul cable in the unit of N;
e is the elastic modulus of the stay cable;
a is the cross-sectional area of the stay cable;
l is the length of the stay cable;
and Delta L is the elongation of the inhaul cable after being stressed.
7. The resistive dragline force measurement method of any of claims 4 to 6, characterized by: in the step S1, the strip base is attached to the outer surface of the cable by a rubber adhesive layer disposed on a side close to the contact.
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| CN111337177A (en) * | 2020-03-19 | 2020-06-26 | 重庆万桥交通科技发展有限公司 | Stay cable life cycle cable force testing device |
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