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Method and device for measuring cable force

A measurement method and technology of limit device, applied in the direction of tension measurement, etc., can solve the problems of large measurement results, complex signal processing, small application range, etc., and achieve the effects of easy portability and installation, high measurement accuracy, and wide application range.

Active Publication Date: 2013-09-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Disadvantages: 1. The cost is too high; 2. It can only measure the tension of the cable head; 3. The durability of the sensor has not been verified in the actual project; 4. The scope of application is small, and it must be installed on the anchorage and the cable hole pad Between the boards, it is inconvenient to install the cable-stayed bridge that has been built; 5. Due to the large size of the pressure sensor, it will have a great impact on the appearance of the building
At the same time, it is difficult to automatically calculate the nth order natural frequency of the steel cable or the frequency difference Δf between two adjacent orders by using the spectrogram
Therefore, the result of measuring the cable force by the frequency method is related to various factors such as the installation position of the vibration pickup, whether the cable is vibrating, the span, sag, slope and boundary conditions of the tested cable, and the signal processing is relatively complicated. 24 / 7 monitoring is not possible
[0009] 2. When the vibration frequencies of the adjacent two orders of the structure are very similar, it will be very difficult to use the frequency vibration method to measure the cable force
Therefore, the frequency vibration method is only suitable for simple cable system (single cable) structures, and for complex cable system (cable group) structures, there is a large error in the measurement results
[0010] 3. The frequency vibration method is only applicable to the measurement of the force of the cable after the tensioning is completed, and it will not be possible to measure the force of the cable during the tensioning process.
Therefore, cable force measurements during passive cable construction will not be able to measure

Method used

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  • Method and device for measuring cable force

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] like figure 1 As shown, a cable force measuring device includes a pin shaft 1 and an ear plate 5. An axial through hole is opened on the axial center axis of the pin shaft 1, and the optical measuring system is placed symmetrically at both ends of the axial through hole. At the transmitting end and the receiving end, the measurement plane of the optical measurement system is coplanar with the axial axis of the pin shaft and the direction of the load, and the lug plate is connected to the pin shaft with a limit device.

[0043] like image 3 As shown, the diameter d of the axial through hole is more than 10mm, and the area of ​​the axial through hole accounts for ≤12% of the area of ​​the pin shaft. The ratio of shaft section moment of inertia ≥ 97.5%.

[0044] The resolution of the optical measurement system is ≤0.01mm.

[0045] The optical measurement system includes a laser emitting end 2 and a laser receiving end 3 .

[0046] like Figure 4 (a) As shown in (b), ...

Embodiment 2

[0057] 1. Calibration of standard test pieces in factory environment;

[0058] A method for measuring cable force, comprising the steps of:

[0059] S1 performs pretreatment on the pin shaft 1 and the lug plate 5;

[0060] There is an axial hole at the central axis of the pin shaft, and a limit device is set at the lug plate to connect the pin shaft, so that the plane of the laser light curtain and the pulling force direction of the cable are coplanar, and the limit device is not limited. Setting the limit device to connect the pin shaft is specifically as follows: set two pins at the pin shaft, and two small limit slots are opened on the lug plate, and the pins match the small limit slots. In the actual structural stress, The existing pin shafts can rotate freely relative to the lug plate. Since the measuring instruments are all installed on the pin shafts, when the pin shafts rotate, the plane of the laser light curtain and the force direction of the cables are not on the s...

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Abstract

The invention discloses a method and a device for measuring a cable force. The device comprises a pin shaft and an ear plate, wherein an axial through hole is arranged in the axial axle wire of the pin shaft, two ends of the axial through hole are respectively and symmetrically provided with a transmitting end and a receiving end of an optical measurement system, a measurement plane of the optical measurement system is coplanar with the axial axes of the pin shaft and the action direction of load, and the ear plate is provided with a limit device to be connected with the pin shaft. On the basis that the pin shaft has the characteristics of being even in material and completely and linearly elastic under the stress state, the cable force of an inhaul cable is confirmed by the measurement of the tinny deformation of the pin shaft of a connecting node under the action of the cable force and the linear relationship between the cable force and the deformation. The method and the device provided by the invention are nondestructive testing technologies, thereby being wide in application range.

Description

technical field [0001] The invention relates to the field of construction detection, in particular to a method and device for measuring cable force. Background technique [0002] In the prior art, the cable force measurement method mainly includes the tension jack measurement method; the pressure sensor measurement method; the frequency vibration measurement method; the electromagnetic measurement method; [0003] Tension jack measurement method, because the pressure gauge itself has the characteristics of excessively fast deflection of the pointer, easy deviation, severe pointer vibration at high pressure, and artificial random errors in the readings, it cannot be used for the measurement of the cable force after the building structure is formed. Dynamic measurement is also not suitable for long-term online force measurement. The measured cable force only represents the cable force at the tension end. [0004] Pressure sensor measurement method; [0005] Disadvantages: 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/04
Inventor 孙文波周伟坚
Owner SOUTH CHINA UNIV OF TECH
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