"Close to the north end of the west side of the unfinished pyramid of Sekhemkhet at Saqqara, a huge construction ramp was partially excavated by Zakaria Ghoneim. It was preserved above the first step of the pyramid. Its slightly sloping side face was rather crudely made of rough fieldstones. It approached the pyramid at a right angle from the quarries in the west and led over unfinished masonry directly into the centre of the pyramid."
"At the small, unfinished pyramid of the Third Dynasty at Sinki four ramps lead from all sides against the inclined faces of the pyramid. Each ramp is 12 metres long and has an angle of about 12 to 15 degrees..." (Building in Egypt - Dieter Arnold p.80-81)
I would add to those two the ramp still in situ at Karnak and there are others that show that ramps certainly were "in the culture".