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Technology for bridge equipment maintenance

- Suppressing long-term corrosion of outdoor equipment in order to extend the life of its anti-rust coating and reduce maintenance costs -

Do you have the problems shown below? This technology will solve them!

Most communication cables are housed inside metal pipes. When a metal pipe has corroded severely, an attempt is made to suppress further corrosion. This attempt consists of: (1) removing rust from the pipe, (2) applying an undercoat of epoxy resin paint and (3) coating the pipe with polyurethane resin paint. This has to be repeated every 10 to 15 years. Problems with this approach are that it is difficult to keep up with the increase in the number of corroding metal pipes and that the maintenance cost tends to increase.

In response to these problems, this technology satisfies the following needs:

  • I want to retard the corrosion of metal pipes in order to extend their lifetime.
  • I want to extend the lifetime of the anti-rust coating and reduce maintenance costs.
  • I want reliable and efficient maintenance that does not require a high level of skill.

Overview

Major features of this technology are: (1) anti-rust wool wax cream and (2) coating technology (Fig.1).

  • (1) Application of a 0.5-mm thick anti-rust wool wax cream extends the lifetime of anti-rust coating to 40 years. This has been confirmed by an accelerated deterioration test and a temperature characteristics test (Fig.2). Re-coating is needed only every 40 years.
  • (2) With the conventional method (using a brush or spray), it is difficult to apply an anti-rust wool wax cream with a uniform thickness greater than 0.5 mm. We have developed what we call the "MARY* coating method," in which a cloth is impregnated with anti-rust wool wax cream and this cloth is wound around a corroding metal pipe. We have also developed tools dedicated to this repair and a method of protecting the anti-rust cream.

This technology makes it possible to extend the cycle of repairing corroding metal pipes, to implement planned maintenance and to reduce maintenance costs.

* Maintenance by rust prevention technology

[Fig.1] Features of the bridge equipment maintenance technology (long-life anti-rust technology)
Fig.1 Features of the bridge equipment maintenance technology (long-life anti-rust technology)

[Fig.2] Results of tests of the longevity of anti-rust wool wax cream
Fig.2 Results of tests of the longevity of anti-rust wool wax cream

Application fields

  • Information communication services and networks
  • Construction and civil engineering, operation and maintenance, and disaster prevention and security
  • Environment and chemistry

Advantages

By applying this technology to corroding metal pipes, it is possible to extend the lifetime of the anti-rust coating to 40 years, which is three times longer than that possible with the conventional method.

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