The big apartment's that require maintenance of plumbing lines outside the flats can have place holder's for ladders like spring shutter door's that can be installed or dropped from the terrace and held in place through a ladder line, magnets and magnetic force. The magnetic force holds the ladder, balances the load or weight of the person or persons working on it. The ladder can be electrically extended bottom up or top down through electrical rotors or motor to pull ladder up or down to and from it's resting position. There would be permanent fixtures in the form of rails and the Ladders could be just shifted or permanently fixed between different shafts to reduce capital and maintenance. The Rails could be of same dimension to ensure that the ladders could be rolled in or rolled out of the rails during maintenance works.
There can hooks for balancing, arm rest or to hold on to a grip while performing the maintenance works.
What do we think or say about this idea?
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