Technology "Finnish post". Theory and practice of "eternal stolbostroeniya"

About five years ago I was with a wicket gate. There was no time to do the most, hired the builders. Stand the guys were not the soul, too, time. Warned that the ground we have clay, so the concrete pillars should be to a depth of freezing. Shook hands, they all did, the work took and left.

His first winter and pillars led. Vyzvanivat became masters, but the phones were turned off. In the heart of Mother of boys, because they obeyed finely concreted poles. In the spring began to remake himself. I dug up the first post and realized that for nothing scolded builders.

Go deep freezing - not a panacea

When obkopal, loosened and pulled out the first post, saw that "concrete naboldashnik" on it for twenty centimeters out of the depth of frost penetration. This was the same story with the other pillars.

It was evident that the drilling holes are periodically showered ground. Therefore, the shape of the concrete part of something reminiscent of a narrow elongated tree. What happened?

For the depth of frost have passed, and thus the swelling under the base of the pillars were removed. But because of the uneven relief form concrete part we received too large traction on the lateral surface.

Rescued from the concrete pillars. To minimize the friction on the lateral surface, inserted into the ground asbestos-cement pipes, which have long lay idle. In any case, exposed asbestos-cement "sleeve" strictly on the level. I put them in metal poles and concreted.

It seemed that the problem is solved, but winter columns again led.

That is capable of frost heave

When the gate once again stuck by warping, even frost special was not. Therefore, the version of the anomalous soil freezing and squeezing column from beneath the base is swept aside. What happens? Soil friction on the asbestos cement pipe and frost heave force is enough to turn the post. Not expected! I had to redo again.

The first idea - to take the place of the asbestos smooth PVC sewer pipe. Then he decided not to tempt fate by experiments and apply the so-called "Finnish technology."

The essence of anything. Drillability well under the column below the freezing depth. Prior to conditional level freezing concreting pole into the ground. Then dress PVC pipe and fill the hole to the top of the concrete between the PVC liner and the metallic tube. After the concrete has set firmly, sleeps bosom.

"Concrete anchor" creates additional resistance, and the plastic sleeve to minimize friction in heaving soil zone. As such, the gate stood third winter. No progress!

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