These men are taking down forming for a site-cast concrete wall. What you see happening is the man in the neon green safety vest hammering out pins within the metal clamps. These pins and clamps keep the wood form from coming apart. In between the horizontal 2x4 members, is a rebar tie that helps to strengthen the concrete after poured. The ties put somewhat of a camber in the wall so that when the rest of the load is built on top of the CC wall, it will settle level. Also, the pieces of lumber that are coming off the wall at a 45 degree angle are support members to keep the wall plumb. Plumb is level but vertically. They also are used to support the wall when the concrete is poured in the form. If the forms weren't properly supported, then the forms could potentially break and concrete would go everywhere and cleanup would be a mess.
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