i do not think it is possible to get that high in foundry. I know that if your that high then it automatically kills you. Im not 100% sure but i dont think you can
Like strretsoccer said, you can get up on the pipes. To do so simply place a teleporter up there. I'm not trying to spam but there is a example on one of my maps called Saw Tower. Once again, not spamming, I just don't know any other examples. Good luck on getting up there.