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TW Catalogue EN Int. 03-2015

24 03/2015 11 WT Joining timber rafters 2/6 Function General information SFS intec’s WT fastening system facilitates the secure, structurally ideal and convenient connection of linked rafters. New standards are set for durable and inherently stable joints in timber structural elements in the process. Functional principle The special geometry of the WT-T-6.5/8.2 x L fastener enables the truss structure to be taken into account. By setting it at an angle of 45°, for example, the forces are differentiated into a «tensile element» and a «compression element». Only the axial tensile and compression forces are therefore assigned to the connecting elements. Another advantage of the cruciform arrangement of the fasten- ers is the stabilisation of the cross section of the rafters joined in this way in the event of deformation due to shrinkage or swelling. This is also referred to as a locking action, since the cross section rein- forced by the fasteners cannot shrink and deform at will. A setting device, the ZL WT, has also been developed for this system solution to ensure the optimum fit of the fasteners. This guarantees: – accurate setting of the fasteners at 45° to the surface – maintenance of the correct installation position – safe and convenient insertion due to stable lightweight design Fachwerkprinzip Zugbelastung Druckbelastung – The choice of fasteners depends on the cross sections of the rafters being joined. – The number of fasteners is determined by the coupling forces. – The maximum clamping capacity of the setting device is 320 mm. Larger clamping capacities for special cross sections on request. Recommendations RR LL 00 >PA6 -GF3 0< >PA6 -GF3 0< CC oonnttrrooll TToorrqquu ee Tensile loadTensile load Compression loadCompression load Truss systemTruss system 11. Technical documentation and data sheets 2403/2015

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