If you have a scrapyard or a construction resale shop near you, repurpose some old pipe into a sturdy shade and support structure for your garden or patio. Pipe arbors are strong enough to support heavy grapevines, gourd, cucumber, squash and melon vines. Convert your pipe arbor into a greenhouse for winter gardening once you harvest your grapes and other produce for the season.
Connect the Pipes
Screw a female tee fitting onto each end of one of the 2-foot long pieces of threaded black-iron pipe.
Screw a 2-foot piece of black-iron pipe into the ends of each female tee. Screw one more female tee onto the end of one of the black-iron pipes you just added. Screw a fourth 2-foot piece of black-iron pipe into the third female tee. You should now have four pieces of 2-foot long, black-iron pipe connected by three female tees.
Repeat to connect the other four pieces of 2-foot-long black-iron pipe, using three black-iron female tees.
Screw a 90-degree, female side-outlet elbow onto the ends of each set of four pipes that you connected in previous steps. A side-outlet elbow looks like a female tee whose arms have been bent into a 90-degree angle. 90-degree side outlets are used to join square or rectangular three-dimensional structures.
Screw the 8-foot pipes into the open ends of each side-outlet elbow to make a square, with the four remaining open ends of the elbows pointing toward the sky.
Screw the 10-foot pipes into the open ends of each elbow. Turn the entire assembly upside down to stand on the 10-foot pipes.
Dig the Holes
Use wooden stakes to mark the four corners of an 8-foot square on the ground where you want your arbor.
Dig 2-foot deep, 12-inch diameter post-holes at the points marked by each stake, using a post-hole digger or a power auger.
Move the pipe arbor frame so that the 10-feet-long legs fit into the four post-holes. Have one helper at each leg to help move the frame (to prevent straining a muscle).
Back-fill the holes around each leg of the pipe arbor frame with sharp-sided gravel.
Mix concrete in your wheelbarrow according to package directions. Fill each hole with concrete and allow to set for three to five days, depending on the weather.