Steel Buildings in Europe

Part 7: Model Construction Specification 7 - 33 13 INTERFACES OF THE STEEL STRUCTURE 13.1 Interface to concrete surfaces Information showing holding-down bolts and the interface of steelwork components to foundations shall include a Foundation Plan showing the base location, position and orientation of columns, the marks of all columns, any other components in direct contact with the foundations, their base location and level, and the datum level. Similar information shall also be provided for components connecting to walls and other concrete surfaces. Complete details of fixing steel and bolts to the foundations or walls, method of adjustment and packing space shall be provided. Before erection of steelwork starts, the steelwork contractor shall inspect the prepared foundations and holding-down bolts for position and level; if he finds any discrepancies which are outside the deviations specified in § D.2.20 of EN 1090-2, he shall request that remedial work be carried out before erection commences. Shims and other supporting devices used as temporary supports under base plates shall present a flat surface to the steel and be of adequate size, strength and rigidity to avoid local crushing of the substructure concrete or masonry. If packings are subsequently to be grouted, they shall be placed so that the grout totally encloses them with a minimum cover of 25 mm unless otherwise specified. If packings are left in position after grouting, they shall be made from materials with the same durability as the structure. If adjustment to the position of the base is achieved using levelling nuts on the foundation bolts under the base plate, these may be left in position unless otherwise specified. The nuts shall be selected to ensure that they are suitable to maintain the stability of the part-erected structure but not to jeopardize the performance of the foundation bolt in service. If spaces under base plates are to be grouted, fresh material shall be used in accordance with § 5.8 of EN 1090-2. Grouting shall not be carried out under column base plates until a sufficient portion of the structure has been aligned, levelled, plumbed and adequately braced. Grouting material shall be used as follows:  The material shall be mixed and used in accordance with product manufacturer's recommendations notably regarding its consistency when used. Material shall not be mixed or used below 0°C unless the manufacturer's recommendations permit it.