Support structure of a cover

A support structure of a cover, wherein the cover comprises a traversable surface and the support structure extends downwards under the cover into a structure, and the support structure comprises beam-shaped supports such that a lower support side of the beam-shaped supports facing away from the traversable surface is subject to a tensile stress when a load is applied to the traversable surface, the beam-shaped supports comprising radially-extending supports extending from an outer edge of the cover inwards, the radially-extending supports each comprising an inner end, the radially-extending supports interconnected at the inner ends by inner supports, each inner support comprising two ends and the each inner support extending from the inner end of one radially-extending support to the inner end of another radially-extending support,

• wherein between the ends of the inner supports a thickness (D) of the inner supports is configured to increase substantially symmetrically up to a maximum value and then decrease when viewing the inner supports of the cover from below such that the maximum value of the thickness (D) of the inner supports is in a central area (M) having a spherical shape between the two ends of each of the inner supports,
• wherein the inner supports and the radially-extending supports comprise side surfaces, the side surfaces of the inner supports and the radially-extending supports comprising an inclination angle relative to a plane perpendicular to the traversable surface of the cover.