Mr Campbell had worked on major projects like the Channel Tunnel and the London Docklands, and at a Solomon Islands copper mine.
He had also designed a fire engine used at airports, an air raid shelter used by politicians and smoke detectors, and had worked on commercial jets.
Mrs Campbell said being a father of 10 had given him "nothing but pleasure" and he had taught them valuable life lessons.
"He adored his grandchildren as they adored him," she said.
"His sudden death has devastated me and my children. It won't be the same here without him. We are trying to cope as we comfort each other through this difficult time. We already miss him terribly."
Mr Campbell died in hospital after falling about 10m in the accident.
A 21-year-old man was also injured, suffering a broken leg and elbow.
APNZ mb cr