Steel Buildings in Europe

Part 7: Model Construction Specification 7 - 43 Proposed Clauses Commentary 8.5 Holing 8.5.1 Dimensions of holes, tolerances on hole-diameters and execution of holing shall comply with the requirements of § 6.6 of EN 1090-2. 8.5.2 Where specified on the drawings, holes with special dimensions shall be provided for connections of movement joints. 8.5.3 Special tolerances on hole diameters shall be as specified on the drawings. Special tolerances would only be needed in exceptional conditions. If pins are used, tolerances should be specified for both holes and pins. 8.5.4 Holes for fasteners shall be formed by drilling or by punching followed by reaming. 8.5.5 Long slotted holes shall be executed as specified on the drawings. This option is only needed for special cases, such as slotted holes for pins in movement joints. Details must then be given on the drawings. 8.6 Assembly 8.6.1 Requirements of Clauses 6.9 and 6.10 of EN 1090-2 shall be applied as appropriate. 8.6.2 Holes for which elongation is not permitted are shown on the relevant drawings. This option is needed for fit bolts for instance. 8.6.3 The acceptability of the addition of any welded temporary attachments and the making of any butt welds additional to those specified on the drawings shall be verified according to the design rules. A record of the details of such attachments and butt welds shall be provided as part of the constructor’s execution documentation. Areas where temporary attachments have been made shall be made good. If weld repairs are necessary these shall be carried out in accordance with the requirements of the appropriate Standard. If there are any restrictions on positioning of temporary attachments, they should be specified, either in this clause or on the drawings. In general, temporary welded attachments are not acceptable within 25 mm of the edges of flange plates. 9. WELDING 9.1 General 9.1.1 Welding shall be undertaken in accordance with the requirements of the relevant part of EN ISO 3834 or EN ISO 14554 as applicable. 9.1.2 A welding plan shall be provided as part of the production planning required by the relevant part of EN ISO 3834. The content of a welding plan is described in § 7.2.2 of EN 1090-2. 9.1.3 Welding may be performed by the welding processes defined in EN ISO 4063. Welding processes are listed in § 7.3 of EN 1090-2.