Above is a photo of a form for a concrete pier for a back deck of a home. The area has been dug dug out using a backhoe in order to have room to put the formwork and pour the pier. To start the formwork, 2x4's are cut to size to surround the perimeter of the pier. When the 2x4's are set in place, they are then set by a piece of rebar driven into the ground through a hole cut in the wood. The formwork used comes in two parts. Each individual part of the form is in an L shape. Then, each L piece is connected using metal hooks that secure one piece to another. Once the forms have been completed, it is time to pour the concrete.
It is hard to tell from this photo, but there is an orange string line that runs across the pier. This string line designates the height that the concrete needs to be poured to.
Now that the concrete is poured and the anchor bolt is put into place, the forms can be removed. If you notice, there are pieces of 2x4 that cover the interior perimeter of the form. It is easy to knock the boards loose after the forms have been removed as opposed to just having the concrete poured into the form. It would be very difficult to pull apart the forms if they have been bonded with the concrete. Once the lumber has been knocked off, your pier is complete!
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