Device and method for detecting breakage of prestressed steel wire of prestressed concrete cylinder pipe (PCCP) based on piezoelectric sensing technology

A technology of prestressed steel wire and prestressed steel, applied in the direction of measuring devices, mechanical devices, and material analysis through electromagnetic means, to achieve low cost, high accuracy, and strong operability

Pending Publication Date: 2020-08-11
CHONGQING UNIV
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  • Abstract
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Problems solved by technology

[0003] Piezoelectric sensors have been used in civil engineering fields such as measuring concrete strength changes, reinforced concrete structure health monitoring and damage detection, and steel pipe concrete structure stress detection and damage identification due to their low cost, high detection accuracy, and good stability. The detection of broken wires of prestressed steel cylinder concrete pipes does not involve

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  • Device and method for detecting breakage of prestressed steel wire of prestressed concrete cylinder pipe (PCCP) based on piezoelectric sensing technology
  • Device and method for detecting breakage of prestressed steel wire of prestressed concrete cylinder pipe (PCCP) based on piezoelectric sensing technology
  • Device and method for detecting breakage of prestressed steel wire of prestressed concrete cylinder pipe (PCCP) based on piezoelectric sensing technology

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Embodiment 1

[0033] This embodiment discloses a device for detecting prestressed steel wire fracture in prestressed steel cylinder concrete pipe (PCCP) based on piezoelectric sensing technology, including a waveform generator 1, a data analysis system 2, a dynamic data acquisition system 3, a zirconium titanium Lead acid piezoelectric ceramic sheet I4 and lead zirconate titanate piezoelectric ceramic sheet II6. The data analysis system 2 is a notebook workstation.

[0034] see figure 1 Or 2, a plurality of said lead zirconate titanate piezoelectric ceramic sheets 4 are arranged on the inside and surface of the PCCP detection section 5, the PCCP detection section 5 is a pipe section with both ends open and the interior is hollow, and the PCCP detection section 5 includes an inner die Concrete 501, outer core concrete 503 and mortar protection layer 505, the inner core concrete 501 is the innermost layer of the pipe wall, the outer surface of the inner core concrete 501 is covered with a st...

Embodiment 2

[0041] This embodiment discloses a method for detecting prestressed steel cylinder concrete pipe (PCCP) prestressed steel wire fracture based on piezoelectric sensing technology, based on the device described in claim 1, comprising the following steps:

[0042] 1) Pouring the inner pipe core concrete 501 of the two PCCP detection sections 5, and setting a steel cylinder 502 on the surface of each inner pipe core concrete 501.

[0043] 2) Paste a number of lead zirconate titanate piezoelectric ceramic sheets I4 on the outer surface of each steel cylinder 502, and the positive and negative terminals of the lead zirconate titanate piezoelectric ceramic sheets I4 have a reserved length.

[0044] 3) Pour outer pipe core concrete 503 on the outer surfaces of the two steel cylinders 502 .

[0045] 4) Wrap several continuous prestressed steel wires 5041 on the outer surface of one outer tubular concrete 503 , and wrap several broken prestressed steel wires 5042 on the outer surface of...

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Abstract

The invention discloses a device and a method for detecting breakage of a prestressed steel wire of a prestressed concrete cylinder pipe (PCCP) based on a piezoelectric sensing technology. Lead zirconate titanate series piezoelectric ceramic pieces (PZT) are arranged on an outer surface of a steel cylinder of the PCCP and an outer surface of a mortar protection layer, the PZT is used for transmitting signals and receiving the signals, and the signals are transmitted in mortar in a mechanical body wave mode. The PZT piezoelectric ceramic piece at the transmitting end is excited to vibrate to generate stress waves and then propagate in mortar, when the stress waves are propagated to the fracture position of the prestressed steel wire, the stress waves can generate energy loss due to scattering, diffraction, reflection and other reasons, and when the stress waves are finally propagated to a receiving end of the PZT piezoelectric ceramic piece, vibration can be caused to generate electricsignals. The existence, the position and the number of the broken prestressed steel wires are determined by comparing the amplitude, the waveform, the energy and other physical quantities of the electric signals under the condition of intact prestressed steel wires and the condition of broken prestressed steel wires. The device has advantages of low cost, high sensitivity, good stability and the like.

Description

technical field [0001] The invention relates to a prestressed steel wire fracture monitoring device and method based on piezoelectric sensing technology. Background technique [0002] At present, the detection and monitoring technologies for broken wires of prestressed steel cylinder concrete pipes (PCCP) mainly include percussion method, electromagnetic eddy current technology, and acoustic optical fiber sensing technology. In engineering practice, the percussion method is too dependent on the experience and judgment of the engineer and the accuracy is not enough. It is time-consuming. The electromagnetic eddy current technology is widely used, with high precision and fast speed, but it is often caused by misjudgment due to the influence of the welded steel plate at the interface. Acoustic optical fiber sensing technology can achieve the effect of real-time monitoring, but it needs to monitor the signal when the water supply is working, and it is difficult to identify the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00G01N19/08
CPCG01N27/00G01N19/08
Inventor 胡少伟汪旭李文昊
Owner CHONGQING UNIV
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