fischer fixing-systems main-catalogue Pagina 652
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Basic knowledge of fastening technology Installation types. There are three different types of installation. Push-through installation Anchor bolt FAZ II Frame fixing SXRL In particular for simplifying installation for series installations or for attachments with two or more fixing points: · If the attachment’s hole diameter is larger than the drill bit diameter, then the attachment can be used as a template. Please note: The drill bit tip is generally larger than the nominal diameter of the drill. · In addition to facilitating a simple installation, an exact fit is also achieved. · The fixing is inserted into the drill hole through the attachment and then tightened (e. g. FAZ II, FBN II, FH II). Pre-positioned installation Zykon anchor FZA Aircrete anchor GB The anchor is installed before fastening the attachment. If drilling is not done precisely, then the holes in the attachment will not match up. This could mean that the anchors cannot be installed or could cause damage to the anchors. The installation sequence: · Transfer the hole pattern of the fixture to the anchor base. · Drill and clean the holes, install the attachment and then fix the attachment (e. g plastic fixings: S, SX, UX; metal fixings: FZA, EA II). 16 Stand-off installation Threaded rod FIS A This allows attachments to be compression and tension resistant at a certain distance from the anchor base. For this purpose, external threaded metal anchors (e. g. FAZ II, FBN II) or internal threaded anchors (e. g. EA II) with screws or threaded rods are clamped against the anchor base surface while using a bearing washer and nut. When using chemical systems with threaded rods (e. g. FIS SB, FIS V, FIS V Plus, FIS EM Plus, and FIS A), the installation can be done without using a bearing washer and nut. A standoff installation is absolutely not recommended in seismic regions. Expert tip · Clearance holes in the attachment are specified for the respective anchor size in the approvals/assessments and manufacturer’s guidelines. · For stand - off installations with shear loads on the anchor, additional bending moment occurs and this must be considered. · The attachment must lie fully flush on the surface base or it must have either a compression resistant levelling layer of max. 3 mm or half the anchor’s diameter, otherwise the anchor must be checked for bending. · The attachment shall be in contact with the anchor over its entire thickness, otherwise the anchor must be checked for bending. 652 · Usable length is the maximum fixing height tfix which takes into account the attachment’s thickness plus additional non-bearing layers (e. g. plaster, air, insulation etc.). · Post-installed anchors must be tightened with a specific torque. A calibrated torque wrench must be used to ensure the correct pre-stressing force and the correct installation of the anchor. For chemical anchors, the prescribed hardening time must be adhered to before tightening torque or service load can be applied. · Anchors must be mounted as a standard unit as delivered. The exchange or removal of parts is not permitted.
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