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The existing building consists of traditional filler joints, floor slabs supported on steel beams with cast-iron columns internally and loadbearing masonry walls externally. Floors generally span 4.0m with columns at 4.0m or 8.0m centres. A survey of the building and load testing of the floors established the extent of remedial/strengthening works required. Proposed alterations included the replacement of the main spine wall by rigid steel frames which incorporate circular hollow section columns to mimic the existing iron columns. The complexity of the connections, and the need to infill the hollow sections with reinforced concrete to provide the required fire resistance, dictated the extensive use of site welding in the fabrication process. Three floors were removed from the main tower to allow for a helical stair leading to the new viewing platform. Floor slabs ...

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