Rothoblaas - Wood screws and connectors Page 151
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MINIMUM DISTANCES FOR CROSS SCREWS SCREWS INSERTED WITH AND WITHOUT PRE-DRILLING HOLE 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 ( * ) For main beam-secondary beam joints with VGZ screws d = 7 mm inclined or crossed, inserted at an angle of 45° to the secondary beam head, with a minimum secondary beam height of 18 d, the minimum distance a2,CG can be taken equal to 3∙d1 . PRE-DRILLING HOLE DIAMETER d1 [mm] 5,3 5,6 7 9 11 dV (pre-drill) [mm] 3,5 3,5 4,0 5,0 6,0 Valid for softwood - maximum density 440 kg/m3. SHEAR CONNECTION WITH CROSSED CONNECTORS - 1 PAIR m 90° g S N T m 45° g S HT a2,CG hNT HHT aCROSS bNT a2,CG 90° BHT BHT section plan SHEAR CONNECTION WITH CROSSED CONNECTORS - 2 OR MORE PAIRS m m g S N T 90° 45° g S HT a2,CG aCROSS hNT HHT e bNT aCROSS a2,CG 90° BHT BHT section plan STRUCTURES | VGZ | 151
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