The cushion Characteristic roadbed material and the step path which possess water permeability, hippodrome

摘要

PURPOSE:To retain favorable cushioning and draining characteristics for a long time, by laying down a roadbed material molded with cylindrical synthetic resin foam particles by thermal bond and provided with a specified function. CONSTITUTION:Cylindrical synthetic resin particles of polypropylene foam for instant are bonded with heat to form an arbitrary shape. After molding, they are treated with a penetrant to obtain a cushioning roadbed material 2. At this time, the water permeability is made more than 1.0X10-2cm/sec and the impact acceleration by a weight-drop-test is made 5-200G or 5-100G. Further, the porocity of the molding is made 5-50%. The synthetic resin particles to be applied have 0.01-0.35g/cm3 in apparent density, 5% or below in water absorption. This cushioning roadbed material 2 is combined with superficial material 1 like rubber chips or the like to lay it.