FIELD: mechanics.
SUBSTANCE: lift jack support device used on soil or peat base consists of power drive and support round or square plate extension mechanisms. Plate shape should allow elastic contact with underlying soil or peat surface via wooden gaskets. Note here that support plate contact surface features convex sphere with contact spot radius of 
and maximum surface settling of 
.
EFFECT: increased load bearing capacity on soil or peat surface.
6 dwg
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