What is a sliding bottom plate?

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Article 4.3.4 of the \"GB50461-2008 Code for Acceptance of Construction Quality of Static Equipment in Petrochemical Industries\" states that for spherical storage tanks that undergo overall heat treatment after welding, a sliding bottom plate should be installed between the pillar base plate and the shims. As I understand it, after the ball tank is welded together, a steel plate is first placed under the bottom plates of each leg; this plate is welded to the shims, and the secondary grouting does not exceed the height of this plate. During overall heat treatment, prevent positional errors caused by thermal expansion and contraction of the equipment. I would appreciate some guidance from those who are more experienced; I’ve never done this in reality, it’s just based on imagination – I’m not sure if it’s correct If that’s the case, then in actual use later on, isn’t it true that it’s not completely connected to the base, but rather rests on the base due to its weight? ? Thank you.