Rising Hinges (Falling hinges when closing) help to press door bottom
seals onto the floor on closing. They are however self closing and door
"hold opens" are required.
There are also rubber tube seals the frames of which can be inserted
flush into the floor. The rubber  tube stands proud of the floor (to
seal the door bottom clearance gap) but is soft enough not to inhibit
the passage of a trolley wheel.
Alan Riach

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