CN110646129B - 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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- CN110646129B CN110646129B CN201910863284.XA CN201910863284A CN110646129B CN 110646129 B CN110646129 B CN 110646129B CN 201910863284 A CN201910863284 A CN 201910863284A CN 110646129 B CN110646129 B CN 110646129B
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 48
- 239000010959 steel Substances 0.000 claims abstract description 48
- 238000005259 measurement Methods 0.000 claims abstract description 26
- 238000004364 calculation method Methods 0.000 claims description 25
- 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 5
- 239000004698 Polyethylene Substances 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 238000004873 anchoring Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 101100087528 Mus musculus Rhoj gene Proteins 0.000 description 2
- 238000001192 hot extrusion Methods 0.000 description 2
- 101100356682 Caenorhabditis elegans rho-1 gene Proteins 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 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
- 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 device and a method for measuring cable force of a resistance type inhaul cable, and relates to the technical field of resistance measurement. The method aims at solving the problem that the existing inhaul cable force measuring method is easily influenced by external environment, so that an accurate cable force value cannot be obtained. The cable tension device comprises a plurality of conductive buckles, two measuring wires, a thermistor and a data acquisition instrument, wherein the conductive buckles are radially arranged on the outer surface of a cable along the axis of the cable at intervals, each conductive buckle is respectively connected with two adjacent steel wire bundles in the cable, so that a plurality of steel wire bundles which are arranged continuously are connected in series through the conductive buckles to form a cable measurement unit, one ends of the two measuring wires are connected with the two conductive buckles at the two ends of the cable measurement unit, the other ends of the two measuring wires are 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 measurement unit and the thermistor, and the cable force of the cable is calculated by deducing a relation formula of the resistance value and the cable force of the cable and combining the resistance values measured before and after the cable tension.
Description
Technical Field
The invention relates to the technical field of resistance measurement, in particular to a device and a method for measuring cable force of a resistance type inhaul cable.
Background
The bearing capacity of the structure is improved through a prestress system in the large-span bridge and the structure, and the prestress is mainly realized through tensioning prestress steel strands and steel strand inhaul cables, wherein the steel strand inhaul cables are used as main stress members of the large-span cable-stayed bridge, and the measurement of the cable force is particularly important.
At present, two methods for measuring the cable force of the steel strand inhaul cable are mainly available, one method is a frequency method, the cable force value of the steel strand inhaul cable is calculated according to the relation between the vibration frequency of the steel strand inhaul cable and the cable force by measuring the vibration frequency of the whole bundle of steel strand inhaul cable, but the method is easy to be interfered by external environment factors, the real vibration frequency of the steel strand inhaul cable is difficult to measure, and especially when the constraint boundaries of the two ends of the steel strand inhaul cable are not clear, the relation between the vibration frequency of the steel strand inhaul cable and the cable force is also difficult to be determined, and the accurate cable force value cannot be calculated; the other method is to measure the induction 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 induction voltage and the cable force.
Disclosure of Invention
The method aims at solving the problems that the existing method for measuring the cable force of the steel strand inhaul cable is easily influenced by external environment, so that an accurate cable force value cannot be obtained. The invention aims to provide a device and a method for measuring the cable force of a resistance type inhaul cable, which calculate the cable force of the inhaul cable by deducing a relation formula of the resistance value and the cable force of the inhaul cable and combining the resistance value and the resistivity measured before and after tensioning the inhaul cable.
The invention solves the technical problems by adopting the technical scheme that the resistance type inhaul cable force measuring device comprises:
the plurality of conductive buckles are arranged on the outer surface of the inhaul cable at intervals along the radial direction of the inhaul cable, and each conductive buckle is respectively connected with two adjacent steel wire bundles in the inhaul cable, so that a plurality of steel wire bundles which are continuously arranged are connected in series through the conductive buckles to form a inhaul cable measuring unit; the conductive buckle comprises a strip-shaped base and a wire, wherein the strip-shaped base is made of an insulating material, the wire is U-shaped, the horizontal part of the wire is embedded in the strip-shaped base, the vertical parts at two ends of the wire extend out of the strip-shaped base, and the end parts of the vertical parts are provided with contact heads which can penetrate through an epoxy coating outside a steel wire bundle, so that two adjacent steel wire bundles are connected in series;
the cable measurement device comprises two measurement wires, wherein one measurement wire is connected with a conductive buckle at one end of the cable measurement unit, and the other measurement wire is connected with a conductive buckle at the other end of the cable measurement 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 cable force measuring device which comprises a plurality of conductive buckles, two measuring wires, a thermistor and a data acquisition instrument, wherein the plurality of conductive buckles are radially and alternately arranged on the outer surface of a cable along the axis of the cable, each conductive buckle is respectively connected with two adjacent steel wire bundles in the cable, so that a plurality of steel wire bundles which are continuously arranged are connected in series through the conductive buckles to form a cable measuring unit, one ends of the two measuring wires are connected with the two conductive buckles at the two ends of the cable measuring unit, the other ends of the two measuring wires are connected with the data acquisition instrument, the thermistor is arranged on one measuring wire, the data acquisition instrument acquires the resistance value of the cable measuring unit and the resistance value of the thermistor, and calculates the internal temperature of the cable. The invention is mainly applied to the cable force measurement of the steel strand inhaul cable.
Preferably, a rubber adhesive layer is further arranged on one side of the strip-shaped base close to the contact head.
In addition, the invention also provides a resistance type inhaul cable force measuring method, which comprises the following steps:
s1: a resistance type inhaul cable force measuring device is arranged on the outer side of an inhaul cable, a plurality of conductive buckles are arranged on the outer surface of the inhaul cable along the radial direction of the inhaul cable at intervals, each conductive buckle is connected with two adjacent steel wire bundles in the inhaul cable respectively, so that a plurality of steel wire bundles which are arranged continuously 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 arranged on one measuring wire;
s2: before stretching the inhaul cable, measuring an initial resistance value Rpull 0 of the inhaul cable measuring unit, measuring a resistance value Rhot of the thermistor, and 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 inhaul cable, wherein the inhaul cable resistivity rho 0 at the temperature T0 can be calculated according to the material type of the inhaul cable;
s3: after the inhaul cable is stretched, measuring a measured resistance value Rpull 1 of the inhaul cable measuring unit and a resistance value Rhot' of the thermistor, calculating the temperature T1 inside the inhaul cable, and calculating the inhaul cable resistivity rho 1 at the temperature T1 according to the material type of the inhaul cable;
s4: according to a resistivity calculation formula and a calculation formula of the elongation of the cable after being stressed, deducing the calculation formula between the cable resistance value and the cable force as follows:
wherein F is the cable force of the cable;
r is the initial resistance value of the inhaul cable measuring unit;
r < 1 > is the measured resistance value of the inhaul cable measuring unit;
ρ0 is the cable resistivity at the cable internal temperature T0;
ρ1 is the cable resistivity at the cable internal temperature T1;
e is the elastic modulus of the inhaul cable;
a is the cross-sectional area of the inhaul cable.
According to the resistance type cable force measuring method, firstly, a resistance type cable force measuring device is installed, a plurality of conductive buckles are radially and alternately installed on the outer surface of a cable along the axis of the cable, each conductive buckle is respectively connected with two adjacent steel wire bundles in the cable, so that a plurality of steel wire bundles which are continuously arranged are connected in series through the conductive buckles to form a cable measuring unit, the cable measuring unit is connected with a data acquisition instrument through a measuring wire, a thermistor is installed on one measuring wire, then, initial resistance values and measured resistance values of the cable measuring unit before and after the cable is tensioned are respectively measured, cable resistivity at different temperatures is calculated according to different thermistor values before and after the cable is tensioned, and finally, the cable force is calculated according to a calculation formula of the cable resistance values and the cable force; the variables in the calculation formula are only the resistance value and the cable resistivity of the cable measuring unit, compared with the vibration frequency, induction response and the like adopted in the existing calculation method, the measuring process of the resistance values of the cable measuring unit and the thermistor is less influenced by the external environment, and the deducing process between the resistance value of the thermistor and the cable resistivity is clear and simple, so that the accuracy of cable force calculation of the cable is facilitated; in addition, the measuring method does not need to consider the anchoring boundary conditions at the two ends of the inhaul cable, has few interference factors, further ensures the accuracy of inhaul cable force calculation, and improves the efficiency.
Preferably, in the step S4, the calculation formula of the resistivity is as follows: ρ=ra/L, wherein,
ρ is the resistivity in Ω·m;
a is the cross-sectional area of the inhaul cable, and the unit is square meter;
r is the resistance value of the inhaul cable, and the unit is omega;
l is the length of the inhaul cable and is in m.
Preferably, in the step S4, the calculation formula of the elongation of the cable after being stressed is as follows: Δl=f L/(e×a), wherein,
f is the cable force of the inhaul cable, and the unit is N;
e is the elastic modulus of the inhaul cable;
a is the cross section area of the inhaul cable;
l is the length of the inhaul cable;
Δl is the elongation of the cable after being stressed.
Preferably, in step S1, the conductive buckle includes a strip-shaped base and a conductive wire, the strip-shaped base is made of an insulating material, the conductive wire is U-shaped, a horizontal portion of the conductive wire is embedded in the strip-shaped base, vertical portions at two ends of the conductive wire extend out of the strip-shaped base, and a contact head is mounted at an end portion of the vertical portion, in step S1, the strip-shaped base is adhered to an outer surface of the inhaul cable through a rubber adhesive layer disposed near one side of the contact head.
Drawings
FIG. 1 is a cross-sectional view of a cable;
FIG. 2 is a cross-sectional view of a cable with a conductive clasp attached;
FIG. 3 is a schematic diagram of the resistance-type cable force measuring device of 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 labels in the figures are as follows:
a wire bundle 1; an epoxy coating 2; a filler 3; a layer 4 of hot extruded polyethylene; a conductive button 11; a measurement wire 12; a thermistor 14; a data line 15; a data acquisition instrument 16; a bar-shaped base 11a; a wire 11b; and a contact 11c.
Detailed Description
The invention is described in further detail below with reference to the drawings and the specific examples. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. For convenience of description, the "upper" and "lower" described below are consistent with the upper and lower directions of the drawings, but this should not be construed as a limitation of the technical scheme of the present invention.
Example 1
The two common inhaul cable systems are mainly two, wherein one of the two common inhaul cable systems is a parallel steel wire bundle 1 protected by hot extrusion Polyethylene (PE) and matched with a cold casting heading anchor inhaul cable system; the other is that a steel strand bundle is formed by single stranded steel strands protected by hot extrusion polyethylene, the outer layer of the whole cable bundle is a double-layer synchronous extrusion formed high-density polyethylene protective sleeve, and two ends of the sleeve are provided with single anchoring clamping piece type anchorage devices to form a group anchor steel strand inhaul cable system. As shown in fig. 1, the former embodiment is exemplified by a cable having parallel wire bundles 1, the steel strands of the cable generally consist of 7 wire bundles 1 which are parallel and gathered, 1 wire bundle 1 is in the center, the remaining 6 wire bundles 1 are circumferentially enclosed on the outer side thereof, and the outer side of each wire bundle 1 is wrapped with an insulating epoxy coating 2. The resistance-type cable force measuring device of the present invention is described below with reference to fig. 2 to 4, which includes:
the cable comprises a plurality of conductive buckles 11, wherein the conductive buckles 11 are radially arranged on the outer surface of the cable at intervals along the axis of the cable, each conductive buckle 11 is respectively connected with two adjacent steel wire bundles 1 in the cable, so that a plurality of steel wire bundles 1 which are continuously arranged are connected in series through the conductive buckles 11 to form a cable measuring unit, 3 conductive buckles 11 are arranged on the cable in the embodiment, 4 steel wire bundles 1 which are continuously arranged form a serial passage, the number of the conductive buckles 11 is set according to the measuring requirement, and the cable measuring unit is only an example;
two measuring wires 12, one measuring wire 12 is connected with the conductive buckle 11 positioned at one end of the inhaul cable measuring unit, and the other measuring wire 12 is connected with the conductive buckle 11 positioned at the other end of the inhaul cable measuring unit;
a thermistor 14 mounted on one of the measurement leads 12;
the data acquisition instrument 16 is connected with the other ends of the two measurement leads 12 respectively.
The invention relates to a resistance type cable force measuring device which comprises a plurality of conductive buckles 11, two measuring wires 12, a thermistor 14 and a data acquisition instrument 16, wherein the plurality of conductive buckles 11 are radially and alternately arranged on the outer surface of a cable along the axis of the cable, each conductive buckle 11 is respectively connected with two adjacent steel wire bundles 1 in the cable, so that a plurality of steel wire bundles 1 which are continuously arranged are connected in series through the conductive buckles 11 to form a cable measuring unit, one end of each of the two measuring wires 12 is connected with the two conductive buckles 11 at the two ends of the cable measuring unit, the other end of each of the two measuring wires is connected with the data acquisition instrument 16, the thermistor 14 is arranged on one measuring wire 12, the data acquisition instrument 16 acquires the resistance value of the cable measuring unit and the resistance value of the thermistor 14, and calculates the cable force of the cable by deducing the relation formula of the resistance value of the cable and the cable force and combining the resistance values measured before and after the cable tensioning. 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 conductive wire 11b, the bar-shaped base 11a is made of an insulating material, the conductive wire 11b is U-shaped, a horizontal portion of the conductive wire 11b is embedded in the bar-shaped base 11a, vertical portions at both ends of the conductive wire 11b extend outside the bar-shaped base 11a, and a contact 11c is mounted at an end portion of the vertical portion, and the contact 11c can penetrate through the epoxy coating 2 outside the wire bundles 1, so that two adjacent wire bundles 1 are connected in series.
More preferably, a rubber adhesive layer is further disposed on one side of the strip-shaped base 11a close to the contact 11c, so that the conductive buckle 11 is firmly adhered to the outer surface of the inhaul cable, and stable connection between the contact 11c and the wire bundle 1 is ensured.
Example 2
The method for measuring the cable force of the resistance type inhaul cable of the invention is described with reference to fig. 1 to 4, and comprises the following specific steps:
s1: the resistance type cable force measuring device according to embodiment 1 is installed outside the cable, 3 conductive buckles 11 are radially and alternately installed on the outer surface of the cable along the axis of the cable, each conductive buckle 11 is respectively connected with two adjacent steel wire bundles 1 in the cable, so that 4 steel wire bundles 1 which are continuously arranged are connected in series through the conductive buckle 11 to form a cable measuring unit, the cable measuring unit is connected with a data acquisition instrument 16 through two measuring wires 12, and a thermistor 14 is installed on one measuring wire 12;
s2: before the cable is stretched (before being stressed), the initial resistance value R of the cable measuring unit is measured Pulling device 0 Resistance value R of cable measurement unit formed by a plurality of wire bundles 1 connected in series Pulling device = Σri, and measuring thermistorResistance value R of 14 Heat of the body The temperature of the thermistor 14 is calculated according to the relation between the resistance value and the temperature of the thermistor 14 to obtain the temperature T inside the inhaul cable 0 According to the material type of the inhaul cable, the temperature T can be calculated 0 Lower cable resistivity ρ 0 ；
S3: after the cable is stretched (after being stressed), the measured resistance value R of the cable measuring unit is measured Pulling device 1 And resistance value R of thermistor 14 Heat of the body ' further calculate the temperature T inside the cable 1 According to the material type of the inhaul cable, the temperature T can be calculated 1 Lower cable resistivity ρ 1 ；
S4: according to a resistivity calculation formula and a calculation formula of the elongation of the cable after being stressed, deducing the calculation formula between the cable resistance value and the cable force as follows:
wherein F is the cable force of the cable;
R pulling device 0 The initial resistance value of the inhaul cable measuring unit is set;
R pulling device 1 The resistance value is measured by the inhaul cable measuring unit;
ρ 0 is the internal temperature T of the inhaul cable 0 The resistivity of the lower inhaul cable;
ρ 1 is the internal temperature T of the inhaul cable 1 The resistivity of the lower inhaul cable;
e is the elastic modulus of the inhaul cable;
a is the cross-sectional area of the inhaul cable.
Stretching the resistance value R measured before and after the step S2 and the step S3 of the inhaul cable Pulling device 0 、R Pulling device 1 Resistivity ρ 0 、ρ 1 And substituting the constant E, A into the formula I to obtain the cable force value of the cable.
According to the resistance type cable force measuring method, firstly, a resistance type cable force measuring device is installed, a plurality of conductive buckles 11 are radially and alternately installed on the outer surface of a cable along the axis of the cable, each conductive buckle 11 is respectively connected with two adjacent steel wire bundles 1 in the cable, so that a plurality of steel wire bundles 1 which are continuously arranged are connected in series through the conductive buckle 11 to form a cable measuring unit, the cable measuring unit is connected with a data acquisition instrument 16 through a measuring wire 12, a thermistor 14 is installed on one measuring wire 12, then, initial resistance values and measured resistance values of the cable measuring units before and after cable tensioning are respectively measured, cable resistivity at different temperatures is calculated according to different thermistor 14 values before and after cable tensioning, and finally, cable force is calculated according to a calculation formula of the cable resistance values and cable force; the variables in the calculation formula are only the resistance value and the cable resistivity of the cable measuring unit, compared with the vibration frequency, induction response and the like adopted in the existing calculation method, the measuring process of the resistance values of the cable measuring unit and the thermistor 14 is less influenced by external environment, the deducing process between the resistance value of the thermistor 14 and the cable resistivity is clear and simple, and the accuracy of cable force calculation of the cable is facilitated; in addition, the measuring method does not need to consider the anchoring boundary conditions at the two ends of the inhaul cable, has few interference factors, further ensures the accuracy of inhaul cable force calculation, and improves the efficiency.
In the above step S4, the calculation formula of the resistivity is as follows: ρ=ra/L, wherein,
ρ is the resistivity in Ω·m;
a is the cross-sectional area of the inhaul cable, and the unit is square meter;
r is the resistance value of the inhaul cable, and the unit is omega;
l is the length of the inhaul cable and is in m.
In the step S4, the calculation formula of the elongation of the cable after being stressed is as follows: Δl=f×l/(e×a), where F is the cable force of the cable, unit N;
e is the elastic modulus of the inhaul cable;
a is the cross section area of the inhaul cable;
l is the length of the inhaul cable;
Δl is the elongation of the 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 the internal temperature T of a certain cable is calculated according to the material type of the cable, which is not described herein.
In the step S1, the strip-shaped base 11a is adhered to the outer surface of the inhaul cable through the rubber adhesive layer arranged on one side close to the contact 11c, so that the conductive buckle 11 is firmly adhered to the outer surface of the inhaul cable, and stable connection between the contact 11c and the steel wire bundle 1 is ensured.
The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure are intended to fall within the scope of the claims.
Claims (6)
1. A resistance-type cable force measuring device, comprising:
the plurality of conductive buckles are arranged on the outer surface of the inhaul cable at intervals along the radial direction of the inhaul cable, and each conductive buckle is respectively connected with two adjacent steel wire bundles in the inhaul cable, so that a plurality of steel wire bundles which are continuously arranged are connected in series through the conductive buckles to form a inhaul cable measuring unit; the conductive buckle comprises a strip-shaped base and a wire, wherein the strip-shaped base is made of an insulating material, the wire is U-shaped, the horizontal part of the wire is embedded in the strip-shaped base, the vertical parts at two ends of the wire extend out of the strip-shaped base, and the end parts of the vertical parts are provided with contact heads which can penetrate through an epoxy coating outside a steel wire bundle, so that two adjacent steel wire bundles are connected in series;
the cable measurement device comprises two measurement wires, wherein one measurement wire is connected with a conductive buckle at one end of the cable measurement unit, and the other measurement wire is connected with a conductive buckle at the other end of the cable measurement 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 resistance cable force measuring device of claim 1, wherein: and a rubber adhesive layer is arranged on one side of the strip-shaped base close to the contact head.
3. A resistance type cable force measuring method, which adopts the resistance type cable force measuring device as set forth in any one of claims 1 or 2, characterized by comprising the following steps:
s1: a resistance type inhaul cable force measuring device is arranged on the outer side of an inhaul cable, a plurality of conductive buckles are arranged on the outer surface of the inhaul cable along the radial direction of the inhaul cable at intervals, each conductive buckle is connected with two adjacent steel wire bundles in the inhaul cable respectively, so that a plurality of steel wire bundles which are arranged continuously 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 arranged on one measuring wire;
s2: before stretching the inhaul cable, measuring an initial resistance value R of the inhaul cable measuring unit Pulling device 0 And measuring the resistance value R of the thermistor Heat of the body The temperature of the thermistor is calculated according to the relation between the resistance value and the temperature of the thermistor, and the temperature T inside the inhaul cable is obtained 0 According to the material type of the inhaul cable, the temperature T can be calculated 0 Lower cable resistivity ρ 0 ；
S3: after the inhaul cable is stretched, the measured resistance value R of the inhaul cable measuring unit is measured Pulling device 1 Resistance value R of thermistor Heat of the body ' further calculate the temperature T inside the cable 1 According to the material type of the inhaul cable, the temperature T can be calculated 1 Lower cable resistivity ρ 1 ；
S4: according to a resistivity calculation formula and a calculation formula of the elongation of the cable after being stressed, deducing the calculation formula between the cable resistance value and the cable force as follows:
wherein F is the cable force of the cable;
R pulling device 0 The initial resistance value of the inhaul cable measuring unit is set;
R pulling device 1 The resistance value is measured by the inhaul cable measuring unit;
ρ 0 is the internal temperature T of the inhaul cable 0 The resistivity of the lower inhaul cable;
ρ 1 is the internal temperature T of the inhaul cable 1 The resistivity of the lower inhaul cable;
e is the elastic modulus of the inhaul cable;
a is the cross-sectional area of the inhaul cable.
4. A method of measuring resistance type stay cable force according to claim 3, comprising the steps of: in the step S4, the calculation formula of the resistivity is as follows: ρ=ra/L, wherein,
ρ is the resistivity in Ω·m;
a is the cross-sectional area of the inhaul cable, and the unit is square meter;
r is the resistance value of the inhaul cable, and the unit is omega;
l is the length of the inhaul cable and is in m.
5. A method of measuring resistance type stay cable force according to claim 3, comprising the steps of: in the step S4, a calculation formula of the elongation of the cable after being stressed is as follows: Δl=f×l/(e×a), where F is the cable force of the cable, unit N;
e is the elastic modulus of the inhaul cable;
a is the cross section area of the inhaul cable;
l is the length of the inhaul cable;
Δl is the elongation of the cable after being stressed.
6. The resistance type cable force measuring method as claimed in any one of claims 3 to 5, wherein: the conductive buckle comprises a strip-shaped base and a wire, wherein the strip-shaped base is made of an insulating material, the wire is U-shaped, the horizontal part of the wire is embedded in the strip-shaped base, the vertical parts at two ends of the wire extend out of the strip-shaped base, the end parts of the vertical parts are provided with contact heads, and in the step S1, the strip-shaped base is adhered to the outer surface of a inhaul cable through a rubber adhesive layer arranged on one side close to the contact heads.
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