Concrete pipe cathode protection testing probe and testing method

Abstract

The invention discloses a PCCP pipe cathode protection testing probe and a testing method. The probe comprises a concrete structure body, a first steel wire, a reference electrode, an auxiliary electrode, a plurality of cables and an outer protection layer. The concrete structure body simulates a concrete core of a PCCP pipe. The first steel wire, the reference electrode and the auxiliary electrode which are separated from one another in a non-stress state are arranged in the concrete structure body. The structure body is wound with a second steel wire in a stress state. The prestress applied on the second steel wire is greater than or equal to the prestress applied on the steel wire arranged in the simulated pipe. The second steel wire and the prestressed steel wire in the PCCP pipe adopt the same material. The plurality of cables comprise a first steel wire cable, a second steel wire cable, a reference electrode cable and an auxiliary electrode cable. One end of the corresponding cable is electrically connected with the first steel wire, the second steel wire, the reference electrode and the auxiliary electrode respectively. The other end of each cable extends out of the concrete structure body. The outer protection layer is covered on the surface of the concrete structure body and the concrete structure body, the first steel wire and the outer protection layer are all made of the same material as that of the simulated PCCP pipe.

Description

field of invention [0001] The invention relates to the technical field of cathodic protection detection, in particular to a concrete pipe cathodic protection test probe and a test method, which are mainly used for measuring the natural corrosion potential and cathodic protection polarization of concrete pipe steel wires (especially PCCP pipes and prestressed steel wires in reinforced concrete structures) Potential, corrosion rate, polarization characteristics and other parameters. Background technique [0002] Prestressed steel cylinder concrete pipe (referred to as PCCP) is a new type of pipe material developed in China in the past ten years. It is made of raw and auxiliary materials such as steel plate, high-strength prestressed steel wire, high-strength concrete, high-strength mortar and rubber sealing ring. It is a composite pipe with high strength, high impermeability and high sealing performance. Due to its many advantages, the application of PCCP pipes in water deliv...

AI Technical Summary

Problems solved by technology

In order to judge the cathodic protection effect, it is necessary to obtain accurate measurement data. Due to the structural characteristics of the PCCP tube, the following problems exist in the judgment of the cathodic protection effect of the PCCP tube: To accurately judge the 100mV polarization criterion stipulated in the NACE RP0100-2004 standard, it is necessary to obtain cathodic polarization potential and natural corrosion potential, and when the PCCP cathodic protection system is powered on, it is difficult to obtain accurate natural corrosion potential, which brings difficulties to the judgment of this criterion

[0003] At the same time, in the cathodic protection test technology of ordinary concrete pipes, since the simple test piece method is currently used, there are also problems such as large IR drop and inaccurate judgment of cathodic protection effect in the potential test

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