Sorry, no, it's nothing like that simple. Gravity rises for a while as you go down then decreases again - I can't without checking remember where it starts to decrease, but I have a feeling that I remember it as being about two thirds of the way towards the centre of the earth. If you could get to the centre of the earth without being crushed - presumably through a tube with some sort of force field as walls - you'd be in zero gravity by the time you reached the centre, but pretty close to zero gravity for miles either side.
