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Farms - so call the main communications supporting a roof of the building or a cloth of the bridge. According to it distinguish rafter and bridge farms. The direct continuous beam can block space only at the limited size of an opening (wooden and iron ceiling beams, the sent rafters of small constructions, longitudinal and cross balochka of the carriageway of bridges and other). For blocking of big flights it is necessary to resort to compound beams or farms of a different look.
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