Amplified piezo sensor wiring problem
You don't seem to understand how to wire an OP-AMP. Here is a quick tutorial on their basics:

https://www.youtube.com/watch?v=kqCV-HGJc6A

The thing is that you are missing a LOT of resistors. An usual OP-AMP circuit contains many resistors to determine the amount of amplification and more...

The tutorial explains quite well what resistor and where do you need to put them in order for your circuit.