Step 1: Acquire Materials
• Quantity 4 of 10 ft long 3/4 inch diameter PVC pipe
• Quantity 4 of 3/4 inch PVC 90° elbow
• Quantity 4 of 3/4 inch PVC 3-way elbow
• Quantity 2 of 3/4 inch PVC tee
• 80 feet of natural fiber twine
Step 2: Cut and Drill PVC
Take one of the 3' length of pipe, and mark 3" from one end. Mark every 6" from the first one, resulting in 6 evenly spaced marks. Drill a 3/8" hole straight through each mark, all the way through the 3/4" pipe. Repeat for the other two 3' lengths, resulting in three 3' lengths with holes.
Step 3: Assemble
The slip fit of each pipe into its respective joint can suffice to hold the structure together, if you wish to be able to disconnect the pieces at the end of the season for compact storage. Although glue can also be used to permanently affix the pieces together for a stronger structure, so long as you have someplace to store the whole structure over the winter.
Feed the twine through one of the holes on one of the bottom 3' pieces, and secure with a double knot. Run the twine over the top 3' piece and down to the third 3' piece, allowing a few extra inches of twine, then cut the twine to length. Feed the twine through the holes in the top 3' piece, then through the holes in the third 3' piece, then secure with another double knot at the end. Trim excess twine to desired length. Repeat for all 6 sets of holes.