Rothoblaas - Vijci i spojnice za drvo Page 151
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MINIMALNE UDALJENOSTI ZA UKRIŽENE VIJKE VIJCI UMETNUTI S PREDBUŠENJEM I BEZ NJEGA d1 [mm] a2,CG [mm] 5,3 4∙d aCROSS [mm] 1,5∙d e [mm] 3,5∙d 5,6 7 9 11 21 23 21( * ) 36 44 8 8 11 14 17 19 20 25 32 39 ( * ) Za spojeve sekundarna greda-glavna greda s vijcima VGZ d = 7 mm koji su pod nagibom ili ukriženi, umetnuti pod kutom od 45° u odnosu na glavu sekundarne grede, s najmanjom visinom sekundarne grede jednakom 18∙d, minimalna udaljenost do2,CG može biti jednaka 3∙d1 . PROMJER PROVRTA PREDBUŠENJA d1 [mm] 5,3 5,6 7 9 11 dV (predbušenje) [mm] 3,5 3,5 4,0 5,0 6,0 Vrijedi za drvo crnogorice (softwood) – najveća gustoća iznosi 440 kg/m3. POVEZIVANJE OPTEREĆENO SMICANJEM S UKRIŽENIM SPOJNIM VIJCIMA - 1 PAR m 90° g S N T m 45° g S HT a2,CG hNT HHT aCROSS bNT a2,CG 90° BHT BHT presjek tlocrt POVEZIVANJE OPTEREĆENO SMICANJEM S UKRIŽENIM SPOJNIM VIJCIMA - 2 ILI VIŠE PAROVA m m g S N T 90° 45° g S HT a2,CG aCROSS hNT HHT e bNT aCROSS a2,CG 90° BHT BHT presjek tlocrt STRUKTURE | VGZ | 151
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