Frank Szmulowicz, Ph. D. Jul 2, 2014:

These are clearly some kind of foundations made of X. In the US, they would be called 4x4 Pressure Treated Beams
http://www.cedarshed.com/foundations.html
since they would be in contact with the ground.
However, there are many beam foundation methods such as post and beam. etc. It is not clear here if the beam is made of wood. Without further context, "beam" seems safe enough.

IRA100 Jul 1, 2014:

ale słaby kontekst krawędziaki to square (timber) log

Frank Szmulowicz, Ph. D. Jul 1, 2014:

Are these wooden beams?

geopiet Jul 1, 2014:

re: a może być "sleepers" ? you might as well ...

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2. a heavy horizontal timber for distributing loads.

3.Building Trades. any long wooden, metal, or stone piece lying horizontally as a sill or footing.

http://dictionary.reference.com/browse/sleeper

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and in barns long joists were sometimes supported on a sleeper (a timber not joined to but supporting other beams) - http://en.wikipedia.org/wiki/Joist

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Ground joist, a joist for a basement or ground floor; a. sleeper. - http://onlinedictionary.datasegment.com/word/ground sill

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Sleeper, a strong internal beam (structure) in construction and shipbuilding - http://en.wikipedia.org/wiki/Sleeper

bourriquet (asker) Jul 1, 2014:

a może być "sleepers" ?

bourriquet (asker) Jul 1, 2014:

stacja elektroenergetyczna (substation)

geopiet Jul 1, 2014:

tu na przykład jest wymieniony krawędziak 7 x 4 cm, co z grubsza odpowiada 2x3 (2" by 3"), ale to coś marne na jakikolwiek podkład ...

Kantówka (krawędziak) 7 × 4 cm przykręcany do słupów; - http://www.zielonyogrodek.pl/jak-wlasnorecznie-zbudowac-alta...

geopiet Jul 1, 2014:

bourriquet podaj, proszę, co jest budowane .... i jakie są wymiary tych „krawędziaków”

tak w ciemno, to na przykład podam "timber (block) supports", ale pomogłoby wiedząc dokładniej o co chodzi ....