fischer Rögzítőrendszerek főkatalógusa Seite 650
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Basic knowledge of fastening technology Drilling. The building material determines the drilling method. Five methods are possible: Rotary drilling Rotary drilling without impact, uses a sharply ground carbide drill bit. When this method is used, the drill hole does not become too large and the perforated brick’s webs do not break. Impact drilling (mechanical) SImpact drill with rotation and a high number of light strokes, is suitable for dense structured building materials.. Hammer drilling (pneumatic) Hammer drill uses rotation and a low number of light strokes with high impact energy, also suitable for dense structured solid building materials. Diamond or core drilling process Mainly used for larger drill hole diameters or for heavily reinforced components and/or if noise or vibration must be reduced. 16 Hollow drilling AR 27 35 Autoclean 0 IR 21 Special drill with a hollow core, which is connected to a vacuum cleaner. Cleans the drilled hole during the drilling operation. No further brushing or blowing is required. Can be used in concrete and masonry with dense structure. Expert tip · The drilling method for approved anchors is specified in the approval / assessment. · Drill bits with excessively worn cutting edges should not be used (see approval /assessment). · For certain fixings, special drills are required (e. g. a stop drill) as per approval /assessment. · Drill holes must be carefully cleaned (blown out and brushed). See the respective approval /assessment or manufacturer’s specifications. · The drill hole depth is always exacly specified and relates to a given anchoring base thickness. For general applications without an approval /assessment the following applies: the drill hole depth + 30 mm should not exceed the anchoring base thickness. 650 · In case of incorrect drilled holes (hitting reinforcements or wrong location), the location for the new drill hole depends on the applicable fixing). Usually, the distance for the new drill hole must be twice the depth of the incorrect drill hole. The wrong drill hole must be filled with injection mortar (e. g. FIS V). · Diamond core drilling is only permitted if stated in the approval/assessment or according to manufacturer’s guidelines (e. g. RSB, FIS EM Plus, FAZ II, FBS II...). · The load bearing capacity is reduced by water filled holes or wet substrates especially for chemical or plastic fixings. · Cutting through a reinforcement must be avoided. · The drill hole must be drilled perpendicular to the anchor base (an inclinement of up to 5° is permited). Exceptional cases are regulated in the anchor approval /assessment and or according to manufacturer's guidelines.
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