What I usually do is turn it partialy over and leave it a bit broken and lumpy.
The birds can then help themselves to any grubs, pests etc that will be exposed. Leave it until November/December time and then cover the whole bed in horse manure or compost, whatever you have kicking around. The worms will do their work.
This can be left until the spring when it will get rotavated into a fine soil.
Personally I will use the same bed to grow the beans in again. A month before I am ready to plant again, I will dig two parallel trenches about a foot apart. Then add any kitchen waste, shredded paper and more manure to the trench's. Beans are hungry feeders and the more waste you have the better. Cover the trenches with the soil you previously removed and you will be good to go again !
The best bit of soil on my allotment is where the beans grow !