Abstract
Corrosion problems of outdoor concrete facilities was summarized through research on coastal substation of Fujian, such as serious corrosion of steel ring and weld in the joints of cement poles, exposure and corrosion of reinforcement, cracking and falling off of concrete cover. The information of concrete facilities’ assessment reports was summarized, and it was found that concrete compressive strength of present age satisfied early design drawings. In addition, appraisal of reliability revealed that all facilities couldn’t satisfy the requirements of current standards and seismic appraisal revealed that all facilities couldn’t meet the seismic requirements. The analysis of concrete facilities’ corrosion mechanism was made, and it was found that concrete facilities in coastal substation suffered triple effects of carbonation, chloride corrosion and stray current corrosion. The power failure schemes needed for present repairing and strengthening measures of concrete facilities lack of feasibility. Research on repairing and strengthening measures of concrete facilities that requiring no or small-scale power cut would be of great significance.
Highlights
Fujian outdoor substation frame has concrete frame and steel frame two schemes
With the increase of the renovation and expansion projects of old substations that have been in operation for more than 20 years, it has been found that the concrete frame columns of these old stations have serious corrosion problems, and the mechanical properties of the frame columns are not enough to support the power grid renovation plan, or even to guarantee the safety under the current operating conditions
2.1 Category of Corrosion Problems Time of Fujian province was put into operation for more than 20 years old substation site investigation found that the old station common concrete frame column in the steel and concrete pole joint weld serious rust, steel rust, concrete cover exposed burst off visible corrosion problems, these problems have seriously affect the structure reliability and safety
Summary
Fujian outdoor substation frame has concrete frame and steel frame two schemes. With the improvement of economic level, the frame constructed after 2006 generally adopts steel frame, while the frame constructed before this is all concrete frame. With the increase of the renovation and expansion projects of old substations that have been in operation for more than 20 years, it has been found that the concrete frame columns of these old stations have serious corrosion problems, and the mechanical properties of the frame columns are not enough to support the power grid renovation plan, or even to guarantee the safety under the current operating conditions. In order to ensure the safe operation of the whole power grid, it is urgent to investigate and analyze the corrosion of the concrete frame of the substation
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