FIELD: building structures; civil and industrial construction engineering. SUBSTANCE: construction unit may be used as bearing structure of mainly bent and compression-bent construction units (beams, purlins, etc.) made of wood. Metal sunk keys have side straps with holes to receive central bolts securing paired grapple clamps installed in inclined position relative to longitudinal axis of construction unit in compliance with shear thrust curves for fastening joints. EFFECT: reduced sectional area of fastening members and stress concentration at loose points. 2 dwg
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