The proposed utility model relates to a construction, in particular height-adjustable support with the upper support plate and a double-floor construction with the proposed support, wherein the plate double floor means arranged on its corners poles rests on the floor base, respectively, to the plate-shaped construction elements, use a building slabs for the installation of floors, installed on the ground with the help of poles. the upper base plate in plan view has a substantially square shape with rounded corners, and on each side of the upper base plate are two notches (60), spaced apart from each other on either side of the tongue (6.2), the sides of which are made straight, which become in almost round concave portion (6c) forming the bottom of the recess (60) and rolling on the sides of the support portion (6.1) located between tongues (6.2) diagonally in the corners of the upper support plate, wherein the rounded edge and (6c), the recess (60) on the sides of the support portion (6.1) form an undercut, thereby forming the perimeter projections (6.11). The technical result is applied to the support members is that the proposed upper support plate height-adjustable support has a simple and reliable design, which greatly simplifies the assembling and the production thereof.
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