Solution To Severe Corrosion Of Wire Rods
Methods to solve Fuse Link severe corrosion
For the reasons why the grounding down conductor and the pull rod are severely corroded, the following three solutions are proposed:
Method 1: Increase the diameter of the grounding down conductor and the pull rod to extend their service life.
Method 2: Add a galvanized layer to make it more corrosion resistant.
Method 3: Install a device on the grounding down conductor and the pull rod to improve its corrosion resistance.
When randomly excavating and inspecting the grounding down conductor and the pull rod, it was found that the most serious corrosion often occurred at 20 to 40 cm from the ground, while the corrosion in other places was not serious. Therefore, as long as the corrosion resistance of this section is improved, the service life of the entire grounding device can be extended.
Through experimental comparison, the first two methods were denied because:
Method 1: Generally, the grounding down conductor is made of 12 mm round steel. Replacing the middle section with 30 mm round steel will increase the service life, but the cost is too high and it is not easy to process. In addition, stress points are prone to appear at the connection between the thick steel bar and the thin steel bar, and it is easy to break during transportation.
Method 2: Although the galvanized layer is added, the steel bars often need to be bent during on-site construction, which can easily damage the galvanized layer.
Therefore, method 3 is selected as a breakthrough to solve the corrosion of grounding down conductors and pull rods.
The original idea was to use the crimping tube for 12mm round steel to crimp the outside of the round steel to increase the thickness of the steel bars and improve its service life. However, it was found through actual operation that this idea has many shortcomings:
(1) The protective layer of the crimping tube must be made before the grounding down conductor is processed. If the buried depth changes, it is difficult to control the position of the crimping tube protective layer 20 to 40 cm below the ground as required.
(2) Once crimped, the galvanized layer of the round steel and the crimping tube is also damaged and still needs to be repainted.
(3) The length of the crimping tube is seriously insufficient. The length of the three crimping tubes is 24 cm. Considering the protection length of 50 cm, at least 6 crimping tubes are required. The cost of each crimping tube is 4 yuan. The cost of a tower crimping tube is 96 yuan, which is relatively high.
Therefore, instead of using a crimped tube as a protective layer, an excellent alternative material is used, namely, a PP-R hot water pipe with an inner diameter of 12mm.
Cut off a 80cm long PP-R hot water pipe with an inner diameter of 12mm, put it on the unwelded grounding down conductor, and place it at any position on the grounding down conductor, and it can be moved at will. After the grounding down conductor and the grounding wire are welded and buried, just move the PP-R hot water pipe to an appropriate position so that the PP-R pipe is exposed 5 to 10cm above the ground. At the same time, slightly heat the two ends of the PP-R hot water pipe with a blowtorch, and then clamp it with pliers to make a good sealing treatment, thereby improving the corrosion resistance of the grounding down conductor where it is most susceptible to corrosion.
