No "cheminations" or "chimenations" in the architectural dictionaries I could lay my hands on. I did find "chemin du ronde" -- which is a walkway behind a rampart, providing communication along a fortified wall (you know, where Robin Hood and the like are fond of having their duels with the evil Sherrif/King/Baron when they're not on a spiral staircase) and I was reminded of "chemin de fer" -- which is the French for railroad (lit. road of iron). Maybe there is some connection there? Perhaps it refers to the layout of streets or something?