SPORTS- OR PLAYGROUND Russian patent published in 2008 - IPC E01C13/04 

FIELD: construction, particularly paving or foundations specially adapted for playgrounds or sports grounds made of prefabricated single units.

SUBSTANCE: ground has artificial covering made as a number of separate three-dimensional members connected with each other. Each member is made of foam-rubber and has thickness of 0.13-0.5 m. The covering includes a number of layers. Upper layer has apparent density of 10-39 kg/m³. Lower layer has apparent density of 40-200 kg/m³.

EFFECT: provision of intensive sport or play activity due to increased load on tailor's muscle and anterior tibial muscle of person engaged into sport or play activity on the ground.

1 cl, 2 dwg