Steel halls and structures
Extending a steel building while the plant stays in operation
Extending a steel hall in an operating plant involves two schedules. One covers construction, the other production and deliveries. Reconciling them requires determining in advance the points where the works will intersect with the company’s day-to-day operations. A shutdown cannot always be avoided. Its scope can, however, be planned, and people, goods and building services can be prepared for the next stages. The documentation should show the actual layout of frames, bracing, foundations and envelope. Changes made after the original construction must be taken into account. The steel hall may have acquired additional services, gates or equipment. What looks like a free zone in the old design may today be an important part of the process.
Survey the building before ordering components
The steel structures of the existing and new parts should be assessed as a planned arrangement. An extension is not always a simple matter of bolting on the next frame. The design must determine the connection method, the foundation and any need for expansion joints. Changes in wind and snow action and in water drainage due to the new geometry are also important.
Separate construction transport from plant operations
Designate the locations for deliveries, unloading and storage of components. Check whether the vehicle carrying the structure can reach the site without blocking the only access to the steel hall. Space is also needed for assembly equipment and its operation. These zones should not be treated as free space available for ongoing storage.
Plant employees and construction crews should know the current routes and restrictions. Temporary changes must not cut off the required exits and access for rescue operations. A steel structure delivered in batches requires logistics to be linked to assembly. The sequence of vehicles should match the sequence of the required components.
Plan when to open the existing envelope
Dismantling the gable wall may expose the interior to precipitation, wind and dirt. In a steel hall with production, the effects on machines, material and working conditions must be assessed. The extent of the covers and the duration of the opening should follow from the work plan. Merely reserving a short time slot does not provide protection against the weather.
Removal of the cladding must be coordinated with the load-bearing system. Bracing elements must not be dismantled without authorisation in order to obtain convenient access. Steel structures must remain stable also in the temporary state. If different bracing is required, its design and the time of application should follow from the structural design and the assembly organisation.
Service changeovers require their own plan
The new part may need power supply, heating, ventilation and fire protection-related systems. Their capacity and the method of connection must be checked. In a steel hall, the existing supply line is not always designed for additional loads. The change in structural loading caused by new cable routes and equipment must also be verified.
For each changeover, determine which zone will lose its service and for how long according to the adopted plan. Prepare how the process will be safeguarded and how the works will be accepted. Completion of cable installation alone is not enough. The steel hall should receive tested systems in accordance with the requirements for their type and method of use.
Assess progress by the readiness of complete zones
Closing the walls does not yet mean the building is ready for storing goods or starting production. Floor slabs, services, safety measures and the relevant formalities may still be needed. In a steel hall, the admission of individual parts for use must be planned. Operation should not begin merely because the building looks complete.
Modular steel structures are conducive to planning subsequent bays, but each phase requires verification. The completed part must function under the intended conditions, and ongoing works must not compromise its safety. It is worth establishing an unambiguous moment for handing over the zone. This makes it easier to define responsibility for access, order and protection of equipment.
After the extension, organise building operations
The new layout may change delivery routes, parking areas and the direction of material flow. Staff need up-to-date rules, and those maintaining the facility need new drawings. A steel hall should have consistent documentation for both parts. Particular attention is required at interfaces, service penetrations and modified drainage.
The connection of the stages should be covered by a plan for subsequent inspections in accordance with the design solution and maintenance recommendations. Record any observed leaks and the repairs carried out. The expansion of a steel hall is complete when the new space can fulfil its designated function. Only when the building and the process work together properly does the company achieve the desired result.
Plan locations for temporarily storing material removed from the building envelope. Communicate changes to traffic organisation also to drivers of external suppliers. Before opening a wall, prepare protection for sensitive equipment and supplies. Keep access to utility shut-off points. Establish rules for handing over zones. Update the delivery schedule.
A joint plan for the works and the plant’s operation should identify the people making decisions at the interface between the two activities.
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