Drive a metal stake or 3-foot length of re-bar at least one foot into the ground and at a 45-degree angle every five feet for the length of the bean row. Drive metal stakes into the ground in the same manner directly opposite the first stakes on the other side of the bean row. The stakes should extend from the ground at least two feet.
Use a hacksaw to score around the 1 1/2-inch, eight-foot-long lengths of PVC pipe, about 1/8-inch deep, every 12 inches.
Slide an eight-foot-length of the scored PVC pipe over each of the metal stakes to act as legs for the trellis.
Tie each of the joints where the two PVC pipes cross with a plastic zip-tie.
Lay a length of 1 1/2-inch PVC pipe in the V where the two PVC pipes cross on each row. Securely connect the length of horizontal PVC pipe with the two crossed PVC pipe on each row with plastic zip-ties. The length of horizontal PVC pipe should extend one foot beyond each end of the crossed pipes.
Hammer a metal stake vertically, at least one foot into the ground and extending two feet above the ground, at each end of the crossed pipes. Slide a length of PVC pipe over each of the two stakes.
Connect the vertical pipe at each end of the row and the horizontal pipe that lays across the V of each of the crossed pipes with a 1 1/2-inch PVC elbow joint.