Help ! How to fix this pipe

[Shiwudao]

Hello, there was a leak on my irrigation main pipe, I try to fix it by myself. I just glued it with a expansion coupling. However when I turn on the water to test it, with all sprinkler valves off, the pipe was pushed upward due to water pressure, thus loose the coupling. I tried another compression coupling, same thing happened, the water leaked from loosed gasket.
Should we bury the pipe or secure it to the ground before water testing? See picture, I actually put some straps to secure the pipe, however looks not enough. Thanks!

 

[Terry]

It looks like PVC pipe there. I would glue the fittings. I've never tried to do compression on a pipe under pressure like that.

 

[Sponsor]

 

[John Gayewski]

The pvc compression fittings don't last. Glue it.

 

[Shiwudao]

It looks like PVC pipe there. I would glue the fittings. I've never tried to do compression on a pipe under pressure like that.

thank you, I decided to glue it and it works now.