Begin Building the Uprights
Since we are going to use standard PVC connectors to attach the crossbars, you can build the uprights in three pieces. You'll start with two 10' PVC pipe as your base, sinking them 2' into the ground and exposing 8' as the first section of your upright. Later in the build, you will connect the shorter pieces of PVC above the crossbar line. The best way to cut the PVC is on a chop saw.
Note: Before mixing the cement, make sure to have everything you need close by -- six bags of quick drying concrete, a hose with good water pressure, a large, long trough to mix the cement, a hoe or rake for mixing and the PVC pipes.
Once ready, mix your concrete. You'll need about 2-1/2 bags for each hole. Add the water slowly, mixing as you go. You want the concrete to be the right consistency -- not too runny or not too thick to pour (Image 1).
Once the cement is fully mixed, start shoveling it into the hole. When the hole is filled, take the 3" PVC pipe and force it through the cement in the center of the hole. Have someone hold the pole in place for a couple of minutes and prepare a brace to support the pipe so the pipe doesn't move while the cement is drying (Image 2).