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Portal rafter<br />

Plate welded to rafter and<br />

bolted to column<br />

Base plate welded to column<br />

Steel packing shims fix column<br />

at correct level<br />

Non-shrinkable grout fills void<br />

left below plate<br />

Void formed by cardboard or<br />

polystyrene cones, which<br />

allows ±20 mm horizontal<br />

tolerance is filled with grout<br />

Large washer fixed to bolt to<br />

prevent pull out<br />

Figure 4.25 Fixed base to steel portal frame.<br />

Base plate welded to column<br />

Holding-down bolts<br />

Steel packing shims fix column<br />

at correct level<br />

Once positioned a temporary<br />

sand bund wall will be positioned<br />

around the column base and<br />

filled with grout. The grout is<br />

non-shrinkable and fills the void<br />

left below plate<br />

Photograph 4.4 Fixed base with four holding-down bolts and base plate of portal packed<br />

to correct level (courtesy of D. Highfield).

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