问题
No, level firm ground works.
You do not need a concrete slab for a shipping container if the ground is level and firm. Gravel, paving slabs, or compacted hardcore work well. A 20ft container puts about 500 kg of weight on each corner casting. Wooden blocks or steel plates under the corners spread the load and prevent sinking on soft ground.
你知道吗？
A concrete slab is not always required because containers are designed to transfer loads through the corners. In many situations, properly prepared corner supports are more important than a full slab. 
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