Erection and erection supervision

What the service covers

Most exported buildings are erected by a local contractor who knows the site, labour rules and permits. World Steel supports them with erection drawings and, where requested, a technical supervisor on site; on selected projects WSC carries out the erection itself under the erection solution. Typical supervision covers:

1. Pre-start review: anchor bolt survey, unloading and storage plan, crane selection and lift plan inputs.
2. Erection of the first braced bay, plumbing and alignment before further bays (see PEB erection sequence).
3. Bolting procedures, including pretensioning and verification where specified.
4. Secondary framing, bracing tensioning and sag rods before sheeting.
5. Roof and wall sheeting, trims, gutters and accessories.
6. Punch list, final tolerances check and handover documentation.

Inputs needed from the client

• Finished foundations with anchor bolts surveyed against the anchor bolt plan.
• Local erection contractor with qualified crane operators, riggers and fall-protection equipment.
• Cranes, man-lifts and tools sized to the heaviest lift and working height.
• Site safety plan and permits required by the local authority.
• Visa, accommodation and site access arrangements for the WSC supervisor.

Deliverables

• Erection drawings, bolt lists and marking plan.
• Daily reports with progress, issues and photographs.
• Records of bolt tightening checks and tolerance surveys where required.
• Punch list and close-out report at handover.

Quality, safety and compliance

Erection must follow the safety rules of the country of the site: OSHA 29 CFR 1926 Subpart R (steel erection) in the United States, provincial occupational health and safety regulations in Canada, the Safe Work Australia code of practice and WHS regulations in Australia, and national rules implementing EU directives in Europe. Tolerances follow AISC 303, CSA S16, AS/NZS 5131 or EN 1090-2 as specified; see erection tolerances and site safety during steel erection. The WSC supervisor advises on method but does not replace the erector's own safety management.

Common issues the supervisor prevents

Most erection problems on exported buildings come from a small number of causes, and a supervisor's main value is catching them early: anchor bolts cast out of position or at the wrong projection; frames erected without the first bay fully braced; bolts left snug-tight where pretensioning is specified; bracing rods over-tightened so that frames are pulled out of plumb; purlins installed with laps in the wrong place or flange braces missing; and sheeting started before the frame is aligned. The supervisor also confirms that unloading and storage protect coatings and that site modifications, such as cutting new openings, are approved by the designer before they are made. Each issue found is recorded in the daily report with the agreed correction, so the owner has a traceable record of how the building was put together and the erector learns the system for future projects.

See roof sheeting and trims and flashings.

Typical schedule

Typically, a local crew erects a single-storey warehouse of a few thousand square metres in about 3–8 weeks after the steel arrives, depending on crew size, cranes, weather and accessories. Supervision is usually provided for the first frames and key stages, or full-time for complex buildings. These ranges are indicative only.