Lay out the pergola's design to determine where its posts must stand on the patio. Using a post-base anchor as a guide, outline the concrete with a marker where the anchor must be located for each post. Mark the locations of bolts inside the outline.
Drill pilot holes with a 3/16-inch masonry bit mounted in a hammer chuck attached to a power dill. Hammer chucks provide a dual boring action because the bit will both rotate into the concrete and "hammer" into it. This will result in a cleaner and faster drilled hole with less likelihood of chipping the surrounding concrete.
Place an anchor base onto the concrete and drive 1/4-inch-wide concrete anchor bolts through the base and into the concrete. These special bolts, typically blue, are designed to hold objects firm in concrete. The bolts also should measure about 1-1/2 inches long.
Set a post into the post-base anchor. Plumb the post by attaching a post level. This is a type of level that measures plumb in both directions at the same time. Post levels have two glass bubbles that meet at a 90-degree angle. They save time because both readings are displayed simultaneously. They also can strap to a post and be used by one person instead of requiring a helper.
Hammer nails through the pre-drilled holes in the post's base and into the post to secure it in place.
Repeat Steps 2 through 5 for the remaining pergola posts.