Длины продольных стержней арматуры колонны должны, как правило, назначаться таким образом, чтобы была исключена потребность в стыках.
Источник:http://www.znaytovar.ru/gost/2/RukovodstvoRukovodstvo_po_kons.html
В случае необходимости устройства стыков внахлестку (без сварки) располагать их следует преимущественно в местах изменения сечения колонны.
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Источник:http://www.znaytovar.ru/gost/2/RukovodstvoRukovodstvo_po_kons.html
Схема устройства стыков продольных стержней монолитных колонн многоэтажных зданий
а - при одинаковом сечении колонн верхнего и нижнего этажей; б - при незначительном различии в сечениях колонн верхнего и нижнего этажей; в - при резком различии в сечениях колонн верхнего и нижнего этажей .
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