The Old Royal Observatory, Greenwich

We designed a scheme for replacing the rotten timber beam ends with steel channels and re-introducing the original forces into the original trusses so that they could support the ceiling once again. Steel plates were placed at the ends of the collar beams and tie rods were inserted and anchored to the bottom ties. Nuts on the tie rods were tightened until the cracks in the timbers had closed and the trusses and the ceiling had lifted by 10mm. Proof that the roof trusses were working once again came when the 1941 hangers became slack. The wartime steel work was then removed.

Completed 1993.

The National Maritime Museum

Carden & Godfrey


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