fischer fixing-systems main-catalogue Strana 651
Nabídka komerčních zákazníků **Nejlépe prodávané z Fischer
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Basic knowledge of fastening technology Installation. In general, the following aspects must be taken into consideration during installation. The edge distance c and centre distance s, as well as the component thickness and width , must be carefully observed to ensure that the fixing can take the required load. Otherwise, it may lead to spalling of the construction material or cracks. For fixings without approval, e. g. nylon fixings, a minimum edge distance of c = 1 x hef (hef = anchorage depth) and a minimum spacing of s =1 x hef must be adhered to for concrete. When using non approved metal anchors, a minimum edge distance of c = 1.5 x hef and a minimum spacing of s = 3 x hef is recommended. When using hammerset anchors, spacing and edge distance can increase due to higher expansion forces. h c s1 s2 The drill hole depth hb must be larger than the anchorage depth (exception chemical anchor systems), to ensure that the screw has enough room at the end of the fixing element to penetrate at least one time the screw’s diameter. hb Drill hole cleaning after drilling, e. g. by blowing out, brushing or suction, is generally necessary. The load bearing capacity will be reduced, if the hole is not cleaned. Exceptions: approved anchor systems where no hole cleaning is required, e. g. FHB II + PF - High speed capsule. 16 2x 2x 2x Expert tip · Strictly adhere to specifications for component geometry, edges and spacings distances. If this is not taken into account, the component will be damaged or the anchor capacity will be reduced. · Drill hole cleaning is essential. The specifications in the approvals and the manufacturer’s specifications must be observed. 651
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