PCCP (prestressed concrete cylinder pipe) pipe broken wire detection equipment based on orthogonal electromagnetic principle

Abstract

The invention discloses PCCP (prestressed concrete cylinder pipe) pipe broken wire detection equipment based on an orthogonal electromagnetic principle. The equipment comprises an exciter, a detector,a protection circuit, a signal processing device and a moving device, wherein the moving device is convenient for carrying the detection device; the exciter and the detector are orthogonally arranged; the protection circuit is used for protecting the exciter; the exciter is driven by a low-frequency sinusoidal signal to generate an alternating magnetic field, and the detector is used for receiving a magnetic field signal caused by an induced current in a steel wire; the signal processing device is used for extracting and amplifying weak electromagnetic signals and judging the positions and the number of broken wires. By means of internal electromagnetic nondestructive detection, the corrosion and breakage conditions of the prestressed steel wire can be checked in a targeted mode, and thehealth condition of the PCCP pipe is evaluated.

Description

technical field [0001] The invention relates to the detection field of prestressed steel cylinder concrete pipes, in particular to a PCCP (prestressed steel cylinder concrete pipe) pipe broken wire detection device based on the principle of orthogonal electromagnetic. Background technique [0002] The prestressed steel cylinder concrete pipe is a high-performance composite pipe, and its structure diagram is shown in figure 1 As shown, the thin steel cylinder 4 covers the surface of the inner concrete tube core 5 , the hoop-wound prestressed steel wire 2 is wound on the surface of the outer concrete 3 , and the outer surface of the steel wire is covered with a cement mortar protective layer 1 . The pipeline is resistant to compression and corrosion, tensile steel wire, impermeable steel cylinder, durable cement mortar and other material characteristics are organically combined, and has the characteristics of large capacity, high bearing capacity, low cost, and easy installati...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the hoop-wound prestressed steel wire is to keep the concrete compacted, over time the wire can corrode and eventually cause it to break, and when this happens, the strength of the pipe in that location decreases

Corrosion progresses further, more broken wires appear at the same location, and the strength of the pipe is significantly reduced, causing the pressurized fluid it contains to leak, resulting in sudden and catastrophic pipe burst accidents

After the pipe burst, it is not limited to the interruption of water supply, but also causes traffic interruption, environmental sanitation, property loss and other problems.

[0005] At present, domestic PCCP routine monitoring includes: flow rate, displacement, internal and external water pressure, pipe top soil pressure and pipeline electrical corrosion, etc. There is a lack of monitoring means for the safety of the PCCP structure itself, and the safety monitoring is seriously behind the engineering construction.

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