What about instead of space elevator some sort of re-usable space launcher - i.e. a HUGE tunnel like contraption that basically propells a vehicle up and out of

What about instead of space elevator some sort of re-usable space launcher - i.e. a HUGE tunnel like contraption that basically propells a vehicle up and out of atmosphere without rockets but something else... - - think like a large hydrolic delivery system that goes x amount of miles from upper atmosphere and vehicle launches at whatever the velocity is to break out of atmosphere ? (I'm no rocket scientist obviously)