Why do fence posts have to be placed in plastic pipes?

Hello everyone! For a long time, photos of pillars using the so-called Scandinavian technology have been walking on the Internet and Zen. Usually everyone writes that with such an installation, the fence has been standing for years, and neither frosty swelling nor corrosion takes it - it was built forever.

In short, the essence of the technology is that two diameters of concreting are formed around the column at once:

• wide - it is located in the lower part of the post and is equal to the diameter of the well under the fence post;
• narrow - it is located above and bounded by the walls of a plastic sewer pipe.

The externally finished pillar looks like this:

In a section, the scheme for installing pillars in a plastic pipe is as follows:

Why is this method effective?

At least three useful properties of this building structure speak in favor of installing fence posts into a cavity made of a plastic pipe.

At first, the plastic will protect the pipe from contact with the ground, which means it will eliminate the capillary suction of water by the concrete and protect the metal post from corrosion. Double effect.

Secondly, the pipe wall is smooth, which means that during the spring heaving, the soil will slide around the pillar without moving it.

Thirdly, the double frame makes the post more stable, which is important if the post holds the wicket or gate hinges.

Which pipe to use:

They will equally well cope with their task as pipes for indoor (gray) or outdoor (orange) use.

How is your fence made?

Share your successful and not so successful experience in building fences and help those who are just ahead !!!