Device and method for comprehensively detecting states of slings and cable clamps of suspension bridge

A comprehensive detection, suspension bridge technology, applied in the direction of measuring devices, instruments, etc., can solve the problem of no comprehensive detection of suspension cable force and cable clip anti-slip performance of suspension bridges, uncontrollable random excitation, and inability to apply the anti-slip performance of suspension bridge cable clips. Detection, etc. problem, to achieve the effect of high precision and precise connection

Pending Publication Date: 2022-04-15
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The patent number is: 201510419551.6 discloses the method for measuring the cable force of the suspension bridge. The cable force is obtained based on the finite element method. This detection method mainly relies on theoretical calculations. Due to the influence of the complexity of the actual working conditions, it is difficult for the theoretical model constructed to fully conform to the actual working conditions.
[0005] The patent number is: 201910236944.1 discloses a device for measuring the internal force of a short suspender of a suspension bridge based on the frequency method. A cable force tester is installed on the suspender to measure the natural vibration frequency of the suspender after excitation, and the suspension is calculated from the measured frequency. Rod internal force, the determination of the natural vibration frequency of the boom in this device depends on the random excitation of the environment. Since the length of the suspension bridge (suspension rod) exceeds 20m, it is often necessary to install a vibration suppression device, and the random excitation imposed by the natural environment is uncontrollable, so it is difficult Precise determination of the natural frequency of the boom
[0006] The patent number is: 201521042700.3 discloses a suspension bridge cable clamp anti-slip test device, which is a simulation test device and cannot be applied to the detection of the anti-slip performance of suspension bridge cable clamps in the actual service state
At present, there is no detection device that can realize the comprehensive detection of the suspension bridge cable force and the anti-skid performance of the cable clamp under the actual service state.

Method used

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  • Device and method for comprehensively detecting states of slings and cable clamps of suspension bridge
  • Device and method for comprehensively detecting states of slings and cable clamps of suspension bridge
  • Device and method for comprehensively detecting states of slings and cable clamps of suspension bridge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Such as Figure 1 to Figure 4As shown, the comprehensive detection device for the state of suspension bridge suspension cables and cable clamps of the present invention includes an excitation unit and a detection unit.

[0052] The vibration excitation unit includes an electric vibration exciter 7, a connecting mandrel 14, and a vibration excitation fixture 15, which are used to apply vibration to the suspension bridge sling; the electric vibration exciter 7 is arranged on a lead screw linear module 18, The connecting push rod 14 is connected with the excitation fixture 15, and the connecting push rod 14 and the excitation fixture 15 are connected by threads; one end of the sling 12 is connected with the bridge deck 22, and the excitation fixture 15 is used to clamp the sling 12, and the The vibration applied by the electrodynamic exciter 7 is transmitted to the sling 12 through the connecting jack 14 .

[0053] The vibration-exciting fixture 15 includes a front clampi...

Embodiment 2

[0062] It also includes a frame and a position adjustment unit arranged between the frame and the electric vibrator 7, see the accompanying drawings Figure 1~Figure 3 , this embodiment is realized on the basis of the above-mentioned embodiment 1, further defines the characteristics of the detection device, the frame includes a frame bottom plate 2, two side supports symmetrically arranged vertically on the frame bottom plate Plate 3, frame bottom plate 2 and side support plate 3 are all made of gray cast iron.

[0063] The position adjustment unit includes:

[0064] a vertical movement unit, used to drive the electric vibrator to move vertically;

[0065] a rotary table, used to drive the electric vibrator to rotate horizontally;

[0066] The horizontal moving unit is used to drive the electric vibrator 7 to move horizontally.

[0067] The vertical mobile unit includes:

[0068] Electric cylinder 4, slide table 5, slide block 16 and linear guide rail 13, wherein, describe...

Embodiment 3

[0073] It also includes a sensor bracket for fine-tuning the position of the eddy current displacement sensor, see the accompanying drawings Figure 6 , this embodiment is realized on the basis of above-mentioned embodiment 1 and embodiment 2, the feature of detection device is further limited, comprises:

[0074] Magnetic base 26, the L-shaped bar 27 that the lower end is connected on the magnetic base, the fixed piece 28 that is installed on the L-shaped bar 27 upper end by screw, described fixed piece 28 is provided with positioning groove 31 and sensor installation groove 30, is used for adjusting The installation position of the fixed piece 28 on the L-shaped bar 27 and the installation position of the eddy current displacement sensor on the fixed piece, the magnetic base is arranged on the frame bottom plate 2 .

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Abstract

The invention discloses a comprehensive detection device and method for the states of a suspension cable and a cable clamp of a suspension bridge, and the device comprises an electric vibration exciter which is used for applying vibration to the suspension cable of the suspension bridge; the eddy current displacement sensor is used for detecting the vibration displacement of the sling; the cable clamp anti-slide performance detection unit comprises a first strain gauge group, a second strain gauge group, pressure-sensitive paper and a high-speed industrial camera, and the first strain gauge group and the second strain gauge group are attached to the surfaces of the main cables on the two sides of the cable clamp respectively and used for dynamically detecting strain values of the surface layers 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 is used for detecting a contact load between the cable clamp and the main cable; and a lens of the high-speed industrial camera is aligned to the junction of the cable clamp and the main cable. According to the invention, comprehensive detection of the sling force and the slip resistance of the sling clip of the suspension bridge in an actual service state can be realized, and the rule of influence of slip of the sling clip on the sling force is obtained.

Description

technical field [0001] The invention relates to the field of detection of suspension bridges, in particular to a comprehensive detection device and method for the states of suspension cables and cable clamps of suspension bridges. Background technique [0002] Suspension bridges have the characteristics of large spanning capacity, good force bearing capacity, lightness and beauty, and are one of the main forms of super-long-span bridges. In recent years, with the rapid development of our country's economy and the continuous improvement of the demand for traffic, suspension bridges have been widely used in bridge construction in our country. Suspension bridge slings and cable clamps are important components that transmit the live load and the dead load of the stiffened beam to the main cable. Changes in the cable force of the sling will cause corresponding changes in the static and dynamic characteristics and line shape of the overall structure of the bridge. The cable force ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/02
Inventor 王大刚徐伟王学东叶继红张馨心孙跃威种海浪
Owner CHINA UNIV OF MINING & TECH
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