FIELD: construction. SUBSTANCE: foundation has lower and upper plates support of movable joint in form of ball located between plates and lock of ball position relative to upper plate. Lock is made of balls or rollers secured to axles and interacting with ball. Ball moves over supporting plate which is located in hollow of lower plate. Rubber spacer covered from atop with powder lubricant is located under plate. Installed between plate and hollow sides are springs. EFFECT: higher efficiency. 2 dwg
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