My 1 year old Black Lab chews on everything. I don't like to chain her up, but she absolutely shreds things when I am gone. How can I stop the chewing?

Dear Ed,

I have 1 year old black lab. I live on farm and she chews on everything...I don't like the idea of having her chained up all the time but every time I come home from work she has brought stuff from the Machine shed out into the yard and absolutely tears stuff to shreds...even when the door is shut she finds things to drag out and chew on...how can I stop her from chewing on everything without chaining her up all day long?