of metal couplers for connection of logs in notch bowls. German
alternative to connection in "dovetail" and cramples
When we plan and project
the log house, we wish it to be big and spacious, wishing to leave
from close city apartments. Today houses with dimensions exceeding
8, 10 and even 12 metres on each of walls are not a rarity. But
to find an equal 12 metre (is more exact 13 metre, taking into account
length of corners) pine is a really good luck. But to find it is
a half-business, it still needs to be brought on a building site.
And here problems of basic or financial character begin, that does
use of "long-lengths" (i.e. logs more than 6 metres long)
So what to do?
Our ancestors somehow left the given situation. Correctly,
applying face connection of logs by a "dovetail"
method (right picture). As a rule, all face joints of logs
are done in notches and as the joint place is closed by the
top log the impression of use of the whole log for a whole
wall is made.
the "dovetail" knot has an essential lack - in time
such connection cracks and also it is necessary to "wedge
up" periodically that usually anybody never does.
"dovetail" - it is NOT production of our company
As a result the density
of corners worsens, there are gaps, the house loses integrity and
walls can start to "float".
Use of metal building
cramples (drawing on the right) became the modern decision
used now by the majority of the building companies.
As you understand
it is also not an ideal decision. In fastening places there
is a very strong pressure upon wood (the "tooth"
area is small, and the weight of the top logs is considerable).
of building cramples is NOT production of our company
As a result crample "presses
through" a log in contact places, there are gaps which are
then reflecting on density of joining of logs in notches, and further
there are problems already named by us above.
Besides, contact of steel
cramples with a tree generates rust that results further in occurrence
of bad sites of wood.
So what shall we do?
As it is known, the genius of mankind always found decisions from,
apparently, desperate situations. This problem has been solved also.
As we already spoke, experts of the company "Log Russia"
have a long-term operational experience not only for clients from
Russia, but also for customers from the Scandinavian countries (first
of all Norway), Spain, Germany and other countries of Western Europe.
Thus we always try to
adopt all the best in world experience of building of wooden houses.
So was with "curtaining
of external corners" (this technique is now used seldom
in Russia, though it is very effective) so became and with application
of the zinced metal couplers for joining of logs.
These two listed approaches
are present "know-hows" of the company "Log Russia",
and, in aggregate with application of other technological approaches
considered in given section, creates the unique competitive situation
supported with a reasonable price policy of the company.
But let's return to our
theme - joining of logs by the way borrowed by us at German colleagues.
In drawing 1 use of the
coupler is represented schematically (the top view and a side view),
representing by itself the zinced hairpin about semimeter long with
carving on all length. The hairpin keeps within the narrow longitudinal
saw cut, passing across a joint of logs. On the ends this cut has
special grooves in the form of triangular prisms.
The zinced metal
washers are put on a hairpin from both ends, and over them
are wound zinced nuts.
Nuts are twisted
with effort during installation of house, dense connection
which will provide dense joining of logs in corners turns
out as a result.
of cramples the bigger area of contact of a washer with
wood is provided, so a much smaller pressure is transferred
(pressure as we remember, it is force, divided on the area).
metal practically is not a subject of corrosion and will
not cause wood defeat.
But not all is
simple, especially, if we use the Canadian bowl and a dowel.
Pay attention on the side view on fig. 1. Difficult enough
system turns out. The hairpin should be deeply enough drowned
in wood as over a hairpin the groove under a thorn laying
above a log becomes.
On the other hand,
in the bottom part of a log it is necessary to cut a bowl
and to put a dowel in it, and this dowel is placed in both
For a hairpin laying
it is necessary to make a narrow and deep groove, its walls
should be vertical and have strictly set sizes. Manufacturing
of grooves in the form of triangular prisms also demand experience
difficulties at work with a considered coupler and increased
requirements to skills of cutters stop the majority of the
building companies in application of the given technique.
company management of "Log Russia" puts interests
of the client above time difficulties with training of the
personnel and widely applies the considered approach at building
of houses to the customers.
In the drawings presented
above 2. 5 use in practice of connection of logs by means of metal
couplers is shown. As an interesting detail - in drawing 4 the nut
and a washer, drowned in a groove are visible. Well and what are
couplers, it is shown on a photo fig. 6.
By the way, pay attention,
that in these photos it is shown a notch of a round log with an
oval-flatten. It is one visit more card of our company, but more
in detail we will tell about it
in other section.
resulted information is the intellectual property of " Log
At a reprint of materials, the reference to a company site is obligatory.