By the nature of my activity, I very often meet installers who professionally deal with one kind or another. activities and I often see huge cases of the tool, which they tearfully transfer from one object to another.
No, not bad, it's very good when a professional has at hand for any force majeure the necessary device, but among the tool, there is also a box with dowels, where only dowels No...
... blue, white, black, red, gray, long, short, some for solid materials, others for hollow, separate dowels for drywall, separately for aerated concrete and on question "Why do you need so much unnecessary trash with you?", the master will defend his position for a very long time.
But, there are craftsmen who do not carry this suitcase with them, but carry in their pockets several dozen of these orange dowels of different lengths and different diameters:
By the way, in the slang of builders, such dowels are called "carrots" due to their shape and color.
And for these craftsmen it does not matter whether they will fix something in concrete, brick, hollow block, drywall or any other material, they know that the "carrot" dowel will cope with any task.
"How so?", - many will ask - "It's clear in concrete, but how does this dowel work in hollow materials?"
To illustrate the work of this dowel, I specially took thin plywood and conducted an experiment. He drilled a through hole and hammered the "carrot" with a hammer.
True, there is one small nuance for use in hollow materials ...
The screw that will attach something to the wall should be slightly longer than the dowel itself.
Now, let's start twisting:
It turns out that this dowel in a hollow material works on a completely different principle than in a solid one. Having tightened the screw all the way, we see the following picture:
The dowel is firmly tightened into the knot and the screw is clamped tightly into the hole in the thin plywood.
Let me have a little theory ...
Dowel "carrot" is included in the category of universal dowels, which easily work both in space and perfectly act as an anchor. In all solid materials, this dowel expands the wall of the hole with its petals, in hollow materials, the dowel is tied into a tight knot.
For clarity, I will give an illustration:
But, if for a solid material the length of the fastener is not important, then, as I described above, for a hollow material it is important use long screws that, when rotating, catch the tip of the dowel, so that it rolls up and anchors fasteners.
Here is a secret that, unfortunately, very few people know! I hope you find this information useful ...
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