CN114353861A - Comprehensive detection device and method for states of suspension cable and cable clamp of suspension bridge - Google Patents
Comprehensive detection device and method for states of suspension cable and cable clamp of suspension bridge Download PDFInfo
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- CN114353861A CN114353861A CN202111459221.1A CN202111459221A CN114353861A CN 114353861 A CN114353861 A CN 114353861A CN 202111459221 A CN202111459221 A CN 202111459221A CN 114353861 A CN114353861 A CN 114353861A
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Abstract
The invention discloses a comprehensive detection device and a comprehensive detection method for states of a suspension bridge sling and a cable clamp, wherein the device comprises an electrodynamic vibration exciter used for applying vibration to the suspension bridge sling; the eddy current displacement sensor is used for detecting the vibration displacement of the sling; the cable clamp anti-slip performance detection unit comprises a first strain gauge group, a second strain gauge group, pressure-sensitive paper and a high-speed industrial camera, wherein the first strain gauge group and the second strain gauge group are respectively attached to the surfaces of main cables on two sides of a cable clamp and are used for dynamically detecting strain values of the surfaces of the main cables on the two sides of the cable clamp; the pressure-sensitive paper is arranged in a contact area of the cable clamp and the main cable and used for detecting a contact load between the cable clamp and the main cable; the lens of the high-speed industrial camera is aligned with the junction of the cable clamp and the main cable. The invention can realize the comprehensive detection of the sling cable force and the anti-sliding performance of the cable clamp of the suspension bridge in the actual service state, and obtain the rule of the influence of the cable clamp sliding on the sling cable force.
Description
Technical Field
The invention relates to the field of suspension bridge detection, in particular to a comprehensive detection device and method for states of a suspension cable and a cable clamp of a suspension bridge.
Background
The suspension bridge has the characteristics of large spanning capacity, good stress capacity, lightness, attractiveness and the like, and is one of the main forms of the bridge with the extra-large span. In recent years, with the rapid development of economy and the continuous improvement of traffic requirements in China, suspension bridges are widely applied to bridge construction in China. The suspension cable and the cable clamp of the suspension bridge are important components for transmitting the constant load of the live load and the stiffening beam to the main cable, the change of the cable force of the suspension cable can lead the static and dynamic characteristics and the linear shape of the whole structure of the bridge to be correspondingly changed, and the bridge can be collapsed when the change of the cable force breaks through the limit; insufficient anti-sliding friction force between the cable clamp and the main cable can cause the cable clamp to slide, so that the cable force of the sling cable changes, and the structural stability of the suspension bridge is further damaged. Therefore, comprehensive detection of the sling force and the anti-sliding performance of the cable clamp of the suspension bridge in an actual service state is carried out, the influence rule of the slippage of the cable clamp on the sling force is explored, and the method has important significance for evaluating the health state of the bridge.
The existing related detection devices and detection methods are few,
the patent numbers are: 201510419551.6 discloses a method for measuring the cable force of suspension bridge cable, based on finite element method, the cable force of suspension bridge cable is obtained, the detection method mainly depends on theoretical calculation, and is influenced by the complexity of the actual working condition, the theoretical model is difficult to be completely in line with the actual working condition.
The patent numbers are: 201910236944.1 discloses a device for measuring the internal force of a short suspension rod of a suspension bridge based on a frequency method, wherein a cable force tester is arranged on the suspension rod to measure the natural vibration frequency of the suspension rod after excitation, and the internal force of the suspension rod is calculated according to the measured frequency.
The patent numbers are: 201521042700.3 discloses a suspension bridge cable clamp anti-slip test device, which is a simulation test device and can not be applied to the detection of the anti-slip performance of the suspension bridge cable clamp in the actual service state. At present, a detection device capable of comprehensively detecting the cable force and the cable clamp anti-sliding performance of a suspension bridge in an actual service state does not exist.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a comprehensive detection device and method for the states of a suspension bridge sling and a cable clamp, so that the comprehensive detection of the sling cable force and the anti-slip performance of the cable clamp of the suspension bridge in the actual service state is realized, and the rule of the influence of the cable clamp slip on the sling cable force is obtained. The device has compact structure, convenient operation and simple detection method.
In order to achieve the purpose, the invention adopts the following technical scheme:
a suspension bridge hoist cable and cable clamp state comprehensive testing device includes:
the vibration exciter is used for applying vibration to a suspension cable of the suspension bridge, the vibration exciter is connected with the vibration excitation clamp through the connecting ejector rod, the vibration excitation clamp is used for clamping the suspension cable, and the vibration applied by the vibration exciter is transmitted to the suspension cable through the connecting ejector rod and the vibration excitation clamp;
the eddy current displacement sensor is used for detecting the vibration displacement of the sling;
the cable clamp anti-slip performance detection unit comprises a first strain gauge group, a second strain gauge group, pressure-sensitive paper and a high-speed industrial camera, wherein the first strain gauge group and the second strain gauge group are respectively attached to the surfaces of main cables on two sides of a cable clamp and are used for dynamically detecting strain values of the surfaces of the main cables on the two sides of the cable clamp;
the pressure-sensitive paper is arranged in a contact area of the cable clamp and the main cable and used for detecting a contact load between the cable clamp and the main cable;
the lens of the high-speed industrial camera is aligned with the junction of the cable clamp and the main cable.
Still include the frame and set up the position control unit between frame and the electrodynamic type vibration exciter, the position control unit includes:
the vertical moving unit is used for driving the electric vibration exciter to vertically move;
the rotating platform is used for driving the electric vibration exciter to horizontally rotate;
and the horizontal moving unit is used for driving the electric vibration exciter to move in the horizontal direction.
The vertical moving unit includes:
the electric cylinder is arranged on a bottom plate of the rack, a piston rod of the electric cylinder is connected with the sliding table through a connecting flange, the connecting flange comprises a first connecting flange and a second connecting flange, the first connecting flange is arranged at the bottom of the sliding table, and the second connecting flange is connected with the piston rod of the electric cylinder; the sliding table is mounted on a linear guide rail through a sliding block, and the linear guide rail is arranged on the rack;
the rotary table is an electric rotary table arranged on the sliding table;
the horizontal moving unit is a lead screw linear module arranged on the electric rotating table;
and the electrodynamic vibration exciter is arranged on the nut moving pair of the lead screw linear module.
Still include sensor support for to the position of electric eddy current displacement sensor finely tunes, include:
magnetic base, lower extreme connect L shape pole on magnetic base, through the stationary blade of mounting screw in L shape pole upper end, be provided with constant head tank and sensor mounting groove on the stationary blade for adjust the mounted position of stationary blade on L shape pole and the mounted position of eddy current displacement sensor on the stationary blade, magnetic base sets up on the frame bottom plate.
The detection device comprises a rack and a detection device body arranged on the rack, and is characterized by further comprising a movable carrier used for driving the rack and the detection device body on the rack to move.
Still include camera support, set up on the removal carrier, high-speed industry camera sets up on camera support.
A method for using the comprehensive detection device for the states of the suspension cable and the cable clamp of the suspension bridge comprises the following steps:
a. determining a proper vibration applying position on the sling and marking the position according to the actual working condition of the sling to be detected;
b. loosening a bolt of a cable clamp connected with the sling above the sling, inserting pressure-sensitive paper into a contact area of the cable clamp and a main cable, then screwing the bolt, respectively attaching a first strain gauge group and a second strain gauge group to the surfaces of the main cable at two sides of the cable clamp, and aligning a camera lens of a high-speed industrial camera to the junction of the cable clamp and the main cable;
c. the stress difference of the main cable surface layers on two sides of the cable clamp is measured through the strain gauge group I and the strain gauge group II, so that the friction force between the cable clamp and the main cable is indirectly obtained, meanwhile, the slippage condition of the cable clamp relative to the main cable is detected through a high-speed industrial camera, and the friction force between the cable clamp and the main cable when the cable clamp slips is recorded as the anti-slip friction force between the cable clamp and the main cable;
d. mounting the connecting ejector rod on the electrodynamic vibration exciter to enable the axis of the connecting ejector rod to be flush with the sling marking position; after the distance between the vibration exciter and the sling is adjusted to a proper value, installing a vibration excitation clamp at the mark, connecting the connecting ejector rod with the vibration excitation clamp and fixedly connecting the ejector rod with the vibration exciter end;
e. starting an electrodynamic vibration exciter, aligning a probe of the eddy current displacement sensor to the sling, adjusting the excitation frequency of the vibration exciter from low to high under the condition that the excitation power output is not changed, and determining the natural frequency of the sling according to an amplitude discrimination method through the detection result of the eddy current displacement sensor; calculating the cable force according to the measured inherent frequency of the sling and the mass and the length of the sling in unit length;
f. according to the detection result of the high-speed industrial camera, further detecting sling cable force values corresponding to different slip values of the cable clamp, and obtaining the rule of influence of the slip of the cable clamp on the sling cable force;
g. and d, taking out the pressure-sensitive paper, obtaining the contact load between the cable clamp and the main cable through the pressure-sensitive paper, and further obtaining the anti-sliding friction coefficient between the cable clamp and the main cable by combining the anti-sliding friction force obtained in the step c.
Has the advantages that:
1. the electric flat car is used as a carrier, so that the device main body can conveniently move on the suspension bridge, and the cable force of each sling and the anti-sliding performance of the cable clamp on the suspension bridge in an actual service state are detected in real time;
2. the vibration exciter is adopted to apply vibration to the suspension cable of the suspension bridge, so that the uncontrollable random excitation of the natural environment can be avoided, and the natural frequency of the suspension cable can be accurately detected;
3. the vibration exciter can drive the vibration exciter to move and rotate in the vertical and horizontal directions, the position of the vibration exciter is freely adjusted according to the position on the sling for applying the excitation, the vibration exciter is accurately connected with the excitation clamp, and the vibration exciter can accurately apply vibration to the sling;
4. the method combines the theoretical calculation of the frequency method with the actual detection, determines the cable force value of the sling according to the relation between the cable force of the sling and the inherent frequency of the sling, and can enable the detection result to reach higher precision;
5. the invention can simultaneously carry out comprehensive detection on the cable force of the suspension bridge suspension cable and the anti-sliding performance of the cable clamp, and can obtain the rule of the influence of the cable clamp sliding on the cable force of the suspension cable according to the detection result.
Description of the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a right side view of the present invention;
FIG. 4 is a top view of the present invention;
FIG. 5 is a partial enlarged view of portion I of FIG. 1
FIG. 6 is a schematic diagram of the sensor holder of FIG. 1;
reference numerals: 1. an electric flat car; 2. a chassis base plate; 3. a side support plate; 4. an electric cylinder; 5. a sliding table; 6. an electric rotating table; 7. an electrodynamic vibration exciter; 8. a main cable; 9. a camera support; 10. a high-speed industrial camera; 11. a cable clamp; 12. a sling; 13. a linear guide rail; 14. connecting a top rod; 15. exciting a clamp; 16. a slider; 17. an eddy current displacement sensor; 18. a lead screw linear module; 19. a sensor holder; 20. a bridge deck; 21. a first connecting flange; 22. a second connecting flange; 23. a first strain gauge set; 24. a second strain gauge set; 25. a pressure-sensitive paper; 26. a magnetic base; 27. an L-shaped rod; 28. a fixing sheet; 29. a screw; 30. a sensor mounting groove; 31. positioning a groove; 32. a first clamping block; 33. a second clamping block; 34. a threaded bore.
Detailed Description
An embodiment of the present invention is further described below with reference to the accompanying drawings.
Example 1
As shown in fig. 1 to 4, the comprehensive detection device for the state of a suspension bridge sling and a cable clamp comprises an excitation unit and a detection unit.
The vibration excitation unit comprises an electrodynamic vibration exciter 7, a connecting ejector rod 14 and a vibration excitation clamp 15 and is used for applying vibration to a suspension cable of the suspension bridge; the electrodynamic vibration exciter 7 is arranged on the lead screw linear module 18 and is connected with the vibration exciting clamp 15 through a connecting ejector rod 14, and the connecting ejector rod 14 is connected with the vibration exciting clamp 15 through threads; one end of the sling 12 is connected with the bridge surface 22, the vibration exciting clamp 15 is used for clamping the sling 12, and the vibration applied by the electrodynamic vibration exciter 7 is transmitted to the sling 12 through the connecting ejector rod 14.
The excitation clamp 15 comprises a front clamping block 33 and a rear clamping block 32, a threaded hole 34 is formed in the front clamping block 33, and the connecting ejector rod 14 is connected with the excitation clamp 15 through the threaded hole 34.
The detection unit comprises a sling cable force detection unit and a cable clamp anti-sliding performance detection unit.
The sling cable force detection unit comprises a sensor support 19 and an eddy current displacement sensor 18, and is used for detecting the vibration displacement of the sling 12, determining the natural frequency of the sling 12 according to an amplitude discrimination method, and calculating the cable force of the sling 12 according to the string vibration theory and the natural frequency of the sling 12; the eddy current displacement sensor 18 is mounted on a sensor mount 19.
The principle of determining the natural frequency of the sling 12 by the sling force detection device according to the amplitude discrimination method is as follows: under the condition that the excitation power output is not changed, the excitation frequency of the electrodynamic vibration exciter 7 is adjusted from low to high, and the displacement amplitude of the sling 12 can be observed to be rapidly increased under a certain excitation frequency through the eddy current displacement sensor 18, wherein the excitation frequency at the moment is the natural frequency of the sling 12.
Based on the frequency method, according to the string vibration theory, the cable force of the suspension cable 12FAnd natural frequencyfHas the relation of
In the formula (I), the compound is shown in the specification,mwhich is the mass per unit length of the sling 12,lthe length of the sling 12.
As shown in fig. 5, the cable clamp anti-slip performance detection unit includes a first strain gauge group 23, a second strain gauge group 24, a pressure sensitive paper 25, a camera bracket 9, and a high-speed industrial camera 10, wherein the first strain gauge group 23 and the second strain gauge group 24 are respectively attached to the surfaces of the main cables 8 on both sides of the cable clamp 11, and are used for dynamically detecting strain values on the surface layers of the main cables 8 on both sides of the cable clamp 11, and calculating a stress difference on both sides according to the measured strain values, so as to indirectly obtain a friction force between the cable clamp 11 and the main cable 8; the pressure-sensitive paper 25 is arranged at the contact area of the cable clamp 11 and the main cable 8 and is used for detecting the contact load between the cable clamp 11 and the main cable 8; the camera support 9 is arranged on the electric flat car 1, the high-speed industrial camera 10 is arranged on the camera support 9, a lens is aligned with the junction of the cable clamp 11 and the main cable 8, a matched analysis system can be used for calibrating a reference point on a shooting picture and tracking the position of the reference point, and the slippage of the cable clamp 11 relative to the main cable 8 is detected.
Example 2
The detection device is characterized by further comprising a frame and a position adjusting unit arranged between the frame and the electrodynamic vibration exciter 7, referring to figures 1-3 of the attached drawings of the specification, wherein the embodiment is realized on the basis of the embodiment 1, the characteristics of the detection device are further limited, the frame comprises a frame bottom plate 2 and two side support plates 3 symmetrically and vertically arranged on the frame bottom plate 2, and both the frame bottom plate 2 and the side support plates 3 are made of gray cast iron.
The position adjustment unit includes:
the vertical moving unit is used for driving the electric vibration exciter to vertically move;
the rotating platform is used for driving the electric vibration exciter to horizontally rotate;
and the horizontal moving unit is used for driving the electric vibration exciter 7 to move in the horizontal direction.
The vertical moving unit includes:
the device comprises an electric cylinder 4, a sliding table 5, a sliding block 16 and a linear guide rail 13, wherein the electric cylinder 4 is arranged on a rack bottom plate 2, a piston rod of the electric cylinder is connected with the sliding table 5 through a connecting flange, the connecting flange comprises a first connecting flange 21 and a second connecting flange 22, the first connecting flange 21 is arranged at the bottom of the sliding table 5, and the second connecting flange 22 is connected with the piston rod of the electric cylinder; the sliding table 5 is mounted on a linear guide rail 13 through a sliding block 16, and the linear guide rail 13 is arranged on the rack;
the rotating table is an electric rotating table 6 arranged on the sliding table;
the horizontal moving unit is a lead screw linear module 18 arranged on the electric rotating table;
the electrodynamic vibration exciter 7 is installed on a nut moving pair of the lead screw linear module 18.
Example 3
The eddy current displacement sensor further comprises a sensor support for finely adjusting the position of the eddy current displacement sensor, which is described in the specification with reference to fig. 6, and the embodiment is realized on the basis of the above embodiments 1 and 2, and the characteristics of the detection device are further defined and comprise:
Example 4
The detection device comprises a rack and a detection device body arranged on the rack, and is characterized by further comprising a movable carrier used for driving the rack and the detection device body on the rack to move. Referring to the attached drawings of the specification and fig. 1 to 4, the embodiment is realized on the basis of the above embodiments 1 to 3, and the characteristics of the detection device are further limited.
Example 5
The detection device further comprises a camera support arranged on the mobile carrier, and the embodiment is realized on the basis of the embodiment 4 shown in the attached drawings of figures 1 to 5, and the characteristics of the detection device are further limited. The high-speed industrial camera is arranged on the camera bracket.
The method for using the comprehensive detection device for the states of the suspension cable and the cable clamp of the suspension bridge comprises the following specific steps:
a. driving the electric flat car 1 to convey the suspension bridge sling and cable clamp state comprehensive detection device to the position of the sling 12 to be detected, and determining and marking a proper vibration applying position on the sling 12 according to the actual working condition of the sling 12 to be detected;
b. loosening bolts of a cable clamp 11 connected with a sling 12 above the sling 12, inserting pressure-sensitive paper 25 into a contact area between the cable clamp 11 and a main cable 8, then screwing the bolts, respectively attaching a first strain gauge group 23 and a second strain gauge group 24 onto the surfaces of the main cable 8 on two sides of the cable clamp 11, and placing a camera support 9 provided with a high-speed industrial camera 10 on the electric flat car 1 to enable a lens of the high-speed industrial camera 10 to be aligned with the junction of the cable clamp 11 and the main cable 8;
c. the stress difference of the surface layers of the main cables 8 on the two sides of the cable clamp 11 is measured through the left strain gauge group II and the strain gauge group II, so that the friction force between the cable clamp 11 and the main cables 8 is indirectly obtained, meanwhile, the sliding condition of the cable clamp 11 relative to the main cables 8 is detected through the high-speed industrial camera 10, and the friction force between the cable clamp 11 and the main cables 8 when the cable clamp 11 slides is recorded as the anti-sliding friction force between the cable clamp 11 and the main cables 8;
d. the connecting ejector rod 14 is arranged on the electrodynamic vibration exciter 7, and the electrodynamic vibration exciter 7 is controlled to vertically move by controlling the electrodynamic cylinder 4, so that the axial lead of the connecting ejector rod 14 is flush with the mark of the sling 12; controlling the electric rotating platform 6 to drive the electric vibration exciter 7 to rotate, and aligning the end part of the connecting ejector rod 14 with the mark position of the sling 12; controlling a lead screw linear module 18 to drive an electrodynamic vibration exciter 7 to move horizontally and linearly, adjusting the distance between the electrodynamic vibration exciter 7 and a sling 12 to a proper value, installing an excitation clamp 15 at a mark, connecting a connecting ejector rod 14 with the excitation clamp 15 and fixedly connecting the ejector rod 14 with the electrodynamic vibration exciter 7;
e. starting the electrodynamic vibration exciter 7, placing a sensor bracket 19 provided with the eddy current displacement sensor 18 on the rack bottom plate 2, aligning a probe of the eddy current displacement sensor 18 to the sling 12, adjusting the excitation frequency of the electrodynamic vibration exciter 7 from low to high under the condition that the excitation power output is not changed, and determining the natural frequency of the sling 12 according to an amplitude discrimination method through the detection result of the eddy current displacement sensor 18; calculating the cable force according to the measured natural frequency of the sling 12 and the mass and the length of the sling 12 in unit length;
f. further detecting sling 12 cable force values corresponding to different slip values of the cable clamp 11 according to the detection result of the high-speed industrial camera 10, and obtaining the rule of the influence of the cable clamp slip on the sling cable force;
g. and (c) taking out the pressure-sensitive paper 25, obtaining the contact load between the cable clamp 11 and the main cable 8 through the pressure-sensitive paper 25, and further obtaining the anti-sliding friction coefficient between the cable clamp 11 and the main cable 8 by combining the anti-sliding friction force obtained in the step c.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should be regarded as the protection scope of the present invention.
Claims (7)
1. A suspension bridge hoist cable and cable clamp state comprehensive testing device includes:
the vibration exciter is used for applying vibration to a suspension cable of the suspension bridge, the vibration exciter is connected with the vibration excitation clamp through the connecting ejector rod, the vibration excitation clamp is used for clamping the suspension cable, and the vibration applied by the vibration exciter is transmitted to the suspension cable through the connecting ejector rod and the vibration excitation clamp;
the eddy current displacement sensor is used for detecting the vibration displacement of the sling;
the cable clamp anti-slip performance detection unit comprises a first strain gauge group, a second strain gauge group, pressure-sensitive paper and a high-speed industrial camera, wherein the first strain gauge group and the second strain gauge group are respectively attached to the surfaces of main cables on two sides of a cable clamp and are used for dynamically detecting strain values of the surfaces of the main cables on the two sides of the cable clamp;
the pressure-sensitive paper is arranged in a contact area of the cable clamp and the main cable and used for detecting a contact load between the cable clamp and the main cable;
the lens of the high-speed industrial camera is aligned with the junction of the cable clamp and the main cable.
2. The device for comprehensively detecting the state of a suspension cable and a cable clamp of a suspension bridge as claimed in claim 1, further comprising a frame and a position adjusting unit disposed between the frame and an electrodynamic exciter, wherein the position adjusting unit comprises:
the vertical moving unit is used for driving the electric vibration exciter to vertically move;
the rotating platform is used for driving the electric vibration exciter to horizontally rotate;
and the horizontal moving unit is used for driving the electric vibration exciter to move in the horizontal direction.
3. The device for comprehensively detecting the state of a suspension bridge sling and a cable clamp according to claim 2, wherein the vertical moving unit comprises:
the electric cylinder is arranged on a bottom plate of the rack, a piston rod of the electric cylinder is connected with the sliding table through a connecting flange, the connecting flange comprises a first connecting flange and a second connecting flange, the first connecting flange is arranged at the bottom of the sliding table, and the second connecting flange is connected with the piston rod of the electric cylinder; the sliding table is mounted on a linear guide rail through a sliding block, and the linear guide rail is arranged on the rack;
the rotary table is an electric rotary table arranged on the sliding table;
the horizontal moving unit is a lead screw linear module arranged on the electric rotating table;
and the electrodynamic vibration exciter is arranged on the nut moving pair of the lead screw linear module.
4. The device for comprehensively detecting the state of the suspension bridge sling and the cable clamp of claim 1, further comprising a sensor bracket for finely adjusting the position of the eddy current displacement sensor, wherein the device comprises:
magnetic base, lower extreme connect L shape pole on magnetic base, through the stationary blade of mounting screw in L shape pole upper end, be provided with constant head tank and sensor mounting groove on the stationary blade for adjust the mounted position of stationary blade on L shape pole and the mounted position of eddy current displacement sensor on the stationary blade, magnetic base sets up on the frame bottom plate.
5. The device for comprehensively detecting the states of the suspension cable and the cable clamp of the suspension bridge as claimed in claim 2, further comprising a moving carrier for driving the rack and the detecting device body on the rack to move.
6. The device for comprehensively detecting the state of the suspension bridge sling and the cable clamp of claim 5, further comprising a camera bracket arranged on the mobile carrier, wherein the high-speed industrial camera is arranged on the camera bracket.
7. A method for using the comprehensive detection device for the states of the suspension cable and the cable clamp of the suspension bridge as claimed in any one of claims 1 to 6, which is characterized by comprising the following steps:
a. determining a proper vibration applying position on the sling and marking the position according to the actual working condition of the sling to be detected;
b. loosening a bolt of a cable clamp connected with the sling above the sling, inserting pressure-sensitive paper into a contact area of the cable clamp and a main cable, then screwing the bolt, respectively attaching a first strain gauge group and a second strain gauge group to the surfaces of the main cable at two sides of the cable clamp, and aligning a camera lens of a high-speed industrial camera to the junction of the cable clamp and the main cable;
c. the stress difference of the main cable surface layers on two sides of the cable clamp is measured through the strain gauge group I and the strain gauge group II, so that the friction force between the cable clamp and the main cable is indirectly obtained, meanwhile, the slippage condition of the cable clamp relative to the main cable is detected through a high-speed industrial camera, and the friction force between the cable clamp and the main cable when the cable clamp slips is recorded as the anti-slip friction force between the cable clamp and the main cable;
d. mounting the connecting ejector rod on the electrodynamic vibration exciter to enable the axis of the connecting ejector rod to be flush with the sling marking position; after the distance between the vibration exciter and the sling is adjusted to a proper value, installing a vibration excitation clamp at the mark, connecting the connecting ejector rod with the vibration excitation clamp and fixedly connecting the ejector rod with the vibration exciter end;
e. starting an electrodynamic vibration exciter, aligning a probe of the eddy current displacement sensor to the sling, adjusting the excitation frequency of the vibration exciter from low to high under the condition that the excitation power output is not changed, and determining the natural frequency of the sling according to an amplitude discrimination method through the detection result of the eddy current displacement sensor; calculating the cable force according to the measured inherent frequency of the sling and the mass and the length of the sling in unit length;
f. according to the detection result of the high-speed industrial camera, further detecting sling cable force values corresponding to different slip values of the cable clamp, and obtaining the rule of influence of the slip of the cable clamp on the sling cable force;
g. and d, taking out the pressure-sensitive paper, obtaining the contact load between the cable clamp and the main cable through the pressure-sensitive paper, and further obtaining the anti-sliding friction coefficient between the cable clamp and the main cable by combining the anti-sliding friction force obtained in the step c.
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| CN202111459221.1A CN114353861A (en) | 2021-12-02 | 2021-12-02 | Comprehensive detection device and method for states of suspension cable and cable clamp of suspension bridge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114878053A (en) * | 2022-06-02 | 2022-08-09 | 辽宁省交通高等专科学校 | Novel high accuracy cable force device of piezoelectric type |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114878053A (en) * | 2022-06-02 | 2022-08-09 | 辽宁省交通高等专科学校 | Novel high accuracy cable force device of piezoelectric type |
| CN114878053B (en) * | 2022-06-02 | 2024-04-19 | 辽宁省交通高等专科学校 | Novel high-precision cable force device of piezoelectric type |
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