My memory insists I watched Batman and Robin step on a disk at the base of the pole, and some mechanism raises the disk upwards, accompanied by smoke or steam.
But here it's obvious there's a cushion at the base. So I might be wrong.
There was an original series episode where the Joker is in Wayne Manor and Batman and Robin need to go from the cave back up the Batpoles. They used a compressed steam lift under the pads to push them back up.