Classifications

• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
  • E01C13/00—Pavings or foundations specially adapted for playgrounds or sports grounds; Drainage, irrigation or heating of sports grounds
  • E01C13/08—Surfaces simulating grass ; Grass-grown sports grounds

Definitions

• the invention relates to a method for providing a substructure construction for an artificial grassfield by providing a foundation on a layer of sand which is present or has been provided, said foundation for the larger part consisting of natural round sand or river sand to which a material of organic origin is added in an amount of more than 1 weight % on basis of the sand.
• the invention furthermore relates to an artificial grassfield, having such a substructure construction, which can be used for practising various sports, especially soccer.
• the damping is the most important factor because with soccer the players make more movements such as jumping and making slidings than with hockey. It has been tried to vary the damping of artificial grass by partly substituting the layer of sand which was strewn between the fibres for an other material such as rubber particles being connected together by means of a binding agent, as described in the US patent specification 4,396,653. On said rubber grains connected together by a binding agent there was strewn a layer of sand. In practice, however, such a construction proved to be unsatisfactory because the layers strewn in were of a too resilient nature.
• An improved substructure construction for an artificial grassfield which can especially be used for soccer because a better damping is obtained is known from the European paten specification 0,136,747.
• the substructure construction described therein is composed of unbroken sand which is mixed with at least 1 per cent by weight of a fibrous material, for which purpose polypropylene fibres, Nylon fibres or glass fibres have been mentioned. From further measurements and observations it has become apparent that the optimum result which can be ob tained with a substructure construction for an artificial grassfield with regard to the flatness and the damping power can be improved by a substructure construction according to the invention.
• Said substructure construction can be laid according to a method as mentioned in the preamble and it is characterized in that 60-70 per cent by weight of river sand is distributed evenly among a quantity of 40-30 per cent by weight of rubber particles. It might be that in the no-prepublished European patent application 204,381 (publication date December 10, 1986) it has been indicated that a substructure construction for an artificial grassfield can be obtained from a mixure of sand and cuttings or fibres of an elestomeric material, but these cuttings or fibres have a length of 10-40 mm and a thickness of 1-4 mm. This means that one used small sheets having a thichness being about 10% of the length .
• crumbles or fragments as used according to the present invention have such a size that the length and thickness are comparable.
• a skeleton of rubber has been obtained in which sand fills up the gaps between the rubber particles.
• the elasticity of the skeleton of the rubber particles is decreased and can be controlled by the sand as filled in between the particles of rubber.
• the rubber particles may orginate from mechanically ground car tyres, the larger part of the rubber particles having a screen size of 6-11 mm and being free of textile and steel.
• On filling the rubber matrix with sand up to 10 per cent by weight of water is added during the mixing of sand and rubber particles in order to aid the filling of the open spaces among the rubber particles.
• the mixture of rubber and sand is provided on the foundation to a height of 4-20 cm, preferably to a height of about 7 cm.
• high damping power corresponds with a high absorption of energy.
• the layer has a thickness of at least 6 cm.
• rubber and sand grains having about the same weight, which implies that because of the lower specific weight of rubber the rubber particles are bigger than the sand grains.
• the rubber grains form the damping skeleton of the foundation whereby displacements or deformations are as much as possible inhibited by the sand filling.
• the layer of rubber and sand thus provided on the sand bed formed a rubber skeleton whose open spaces were willed with sand particles, so that the freedom of movement of the rubber particles was strongly restricted by the sand.
• On this bed of rubber and sand a film of porous material was then provided and finally the artificial grass. With this construction an artificial grassfield has been obtained suitable for playing soccer.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Road Paving Structures (AREA)
• Prostheses (AREA)
• Materials For Medical Uses (AREA)
• Control Of Position, Course, Altitude, Or Attitude Of Moving Bodies (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

Family

ID=19848546

Family Applications (1)

Country Status (6)

Cited By (8)

Families Citing this family (6)

Citations (4)

• 1986
  • 1986-09-15 NL NL8602322A patent/NL8602322A/nl not_active Application Discontinuation
• 1987
  • 1987-09-14 AT AT87201794T patent/ATE49251T1/de not_active IP Right Cessation
  • 1987-09-14 EP EP87201794A patent/EP0260769B1/de not_active Expired - Lifetime
  • 1987-09-14 DE DE8787201794T patent/DE3761316D1/de not_active Expired - Fee Related
  • 1987-09-14 GB GB8721600A patent/GB2196539B/en not_active Expired - Fee Related
  • 1987-09-15 ES ES8702656A patent/ES2005323A6/es not_active Expired

Patent Citations (4)

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