EP0136747B1 - Method of providing a substructure for an artificial grass field and artificial grass field applied to such a substructure - Google Patents

Method of providing a substructure for an artificial grass field and artificial grass field applied to such a substructure Download PDF

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Publication number
EP0136747B1
EP0136747B1 EP84201229A EP84201229A EP0136747B1 EP 0136747 B1 EP0136747 B1 EP 0136747B1 EP 84201229 A EP84201229 A EP 84201229A EP 84201229 A EP84201229 A EP 84201229A EP 0136747 B1 EP0136747 B1 EP 0136747B1
Authority
EP
European Patent Office
Prior art keywords
sand
artificial grass
substructure
fibres
foundation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84201229A
Other languages
German (de)
French (fr)
Other versions
EP0136747A1 (en
Inventor
Josephus Cornelis Heerkens
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wegenbouwmaatschappij J Heijmans BV
Original Assignee
Wegenbouwmaatschappij J Heijmans BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wegenbouwmaatschappij J Heijmans BV filed Critical Wegenbouwmaatschappij J Heijmans BV
Priority to AT84201229T priority Critical patent/ATE24560T1/en
Publication of EP0136747A1 publication Critical patent/EP0136747A1/en
Application granted granted Critical
Publication of EP0136747B1 publication Critical patent/EP0136747B1/en
Expired legal-status Critical Current

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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
    • 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
    • E01C13/02—Foundations, e.g. with drainage or heating arrangements

Definitions

  • the invention relates to a method of providing a substructure of an artificial grass field by arranging a foundation on an available layer of sand or a deposited layer of sand.
  • the invention furthermore relates to an artificial grass field applied to such a substructure.
  • the substructure is further improved by applying a layer of lava to the layer of sand to a height of about 15 cm, the surface of the coarse lava layer being strewn with lava sand, on which a water-pervious, pressure-distributing thin cloth is deposited.
  • a draining system may be arranged.
  • the lava is a stony material originating from Germany or France and formed by solidification of vulcanic material.
  • the foundation is composed of a mixture of material containing unbroken sand with at least 1% by weight of fibrous material.
  • the higher damping is obtained by using the unbroken sand, a kind of sand consisting of round grains, in which preferably at least 95% by weight has a granular size distribution of 0.2 to 0.6 mm. If in the foundation only this unboken sand were used, a high damping would be obtained, it is true, but the cohesion of this sand is so poor that permanent deformations would occur in the foundation layer where the foundation is loaded. In order to minimize such deformations it appeared to be necessary to mix the unbroken sand with at least 1% by weight of fibrous material. Preferably 3 to 7% by weight of fibrous material was used.
  • fibrous material is organic fibres and artificial fibres such as polypropylene fibres or Nylon fibres or inorganic fibres such as glass fibres. These fibres preferably have a length of 6 to 10 mm and a thickness of about 10 pm. By using this fibre material in the unbroken sand a foundation is obtained, which on the one hand has a high damping and on the other hand minimum deformation since the fibres have a levelling and stress-distributing effect on the sand grains.
  • the unbroken sand is a round, natural sand, for example, from river sand, whereas broken sand is obtained by a mechanical grinding treatment of, for example, stones; this broken sand has an angular grain surface.
  • the resistance to deformation of the stability of the layer is increased.
  • the fibrous material less deep indents and bulging of the foundation are ensured at the places of load than without fibrous material in the unbroken sand.

Abstract

A method of constructing a substructure for an artificial grass field by depositing a foundation on an available layer of sand or a layer of sand applied in which the foundation is composed of a mixing of material containing unbroken sand with at least 1% by weight of fibrous material.

Description

  • The invention relates to a method of providing a substructure of an artificial grass field by arranging a foundation on an available layer of sand or a deposited layer of sand. The invention furthermore relates to an artificial grass field applied to such a substructure.
  • An artificial grass field and an associated substructure are described in British Patent 1,528,264, which artificial grass field is developed for outdoor games, in particular tennis and hockey. From this British Patent it appears that the substructure is built up from a layer of stones or gravel on which a layer of sand and a layer of clay are deposited. Such an artificial grass field is also described in Dutch Patent Application 8100174 (GB-A-2087959), wherein it is, however, stated on page 3, last paragraph that the premliminary treatment of the base of the field does not form part of the Patent Application and that it is only schematically designated by reference sign 21.
  • In the further developments of such artificial grass fields the substructure is further improved by applying a layer of lava to the layer of sand to a height of about 15 cm, the surface of the coarse lava layer being strewn with lava sand, on which a water-pervious, pressure-distributing thin cloth is deposited. In this substructure, if desired, a draining system may be arranged. The lava is a stony material originating from Germany or France and formed by solidification of vulcanic material.
  • For given sports, particularly for football it has appeared to be important that on such an artificial grass field high damping should be ensured in order to discharge the sportsman as much as possible and in order to render the game on the artificial grass field as much as possible similar to that on a natural grass field. Solutions in this respect have hitherto been sought in modifications of the grass surface, for example, by bringing sand between the fibres as indicated in the aforesaid British Patent 1,528,264 (or the corresponding U.S. Patent 4,044,179) and Dutch Patent Application 8100174. It has now been found that a higher damping for such an artificial grass field can also be obtained by replacing the lava of the foundation by a different material and the method embodying the invention is characterized in that in the method mentioned in the preamble the foundation is composed of a mixture of material containing unbroken sand with at least 1% by weight of fibrous material.
  • The higher damping is obtained by using the unbroken sand, a kind of sand consisting of round grains, in which preferably at least 95% by weight has a granular size distribution of 0.2 to 0.6 mm. If in the foundation only this unboken sand were used, a high damping would be obtained, it is true, but the cohesion of this sand is so poor that permanent deformations would occur in the foundation layer where the foundation is loaded. In order to minimize such deformations it appeared to be necessary to mix the unbroken sand with at least 1% by weight of fibrous material. Preferably 3 to 7% by weight of fibrous material was used. An example of fibrous material is organic fibres and artificial fibres such as polypropylene fibres or Nylon fibres or inorganic fibres such as glass fibres. These fibres preferably have a length of 6 to 10 mm and a thickness of about 10 pm. By using this fibre material in the unbroken sand a foundation is obtained, which on the one hand has a high damping and on the other hand minimum deformation since the fibres have a levelling and stress-distributing effect on the sand grains.
  • In providing such a foundation layer there will be a tendency to minimize the content of fibre material because it is very expensive as compared with the sand to be used. The fibrous material will be about 50 times more expensive per kilogram than the sand to be used. In constructing hockey fields a less high damping will suffice than in the construction of football fields. In such a foundation layer unbroken sand may be replaced partly by broken sand in conjunction with less fibrous material. The layer of broken sand has a considerably lower damping than unbroken sand, but the deformation of the layer of broken sand is less than that of a layer of unbroken sand. The lower sensitivity of broken sand to deformation enables the use of less fibrous material. The replacement of 40% of unbroken sand by broken sand brings about a potential reduction of the use of fibres. If in pure unbroken sand for a hockey field 5% of fibres is used, the amount of fibre can be reduced to 3% by replacing 40% of unbroken sand by broken sand. The resultant damping is lower, it is true, but the sensitivity to deformation remains substantially the same.
  • The unbroken sand is a round, natural sand, for example, from river sand, whereas broken sand is obtained by a mechanical grinding treatment of, for example, stones; this broken sand has an angular grain surface.
  • By the addition of the fibres the resistance to deformation of the stability of the layer is increased. By adding the fibrous material less deep indents and bulging of the foundation are ensured at the places of load than without fibrous material in the unbroken sand.
  • Apart from the construction of artificial grass field for football, hockey or tennis such artificial grass fields may also be used for other sports, in particular in riding schools.

Claims (7)

1. A method of constructing a substructure for an artificial grass field by depositing a foundation on an available layer of sand or a deposited layer of sand characterized in that the foundation is composed of a mixture of material containing unbroken sand with at least 1% by weight of fibrous material.
2. A method as claimed in Claim 1 characterized in that at least 95% by weight of the sand has a grain size distribution of 0.2 to 0.6 mm.
3. A method as claimed in Claims 1 to 2 characterized in that the foundation contains 3 to 7% by weight of fibrous material.
4. A method as claimed in Claims 1 to 3 characterized in that the fibrous material is chosen among organic fibres such as polypropylene fibres or PA 6 (Nylons) fibres or inorganic fibres such as glass fibres.
5. A method as claimed in Claim 4 characterized in that the fibres have a length of 6 to 10 mm and a thickness of 5 to 15 µm.
6. A method as claimed in Claims 1 to 5 characterized in that apart from the fibrous material and unbroken sand an amount of broken sand is provided in the foundation.
7. An artificial grass field comprising an upper layer of artificial grass fibres arranged in a mat deposited on a substructure, in which a layer of sand may be applied between the artificial grass fibres characterized in that the substructure is composed as described in Claims 1 to 6.
EP84201229A 1983-08-30 1984-08-28 Method of providing a substructure for an artificial grass field and artificial grass field applied to such a substructure Expired EP0136747B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84201229T ATE24560T1 (en) 1983-08-30 1984-08-28 PROCEDURE FOR BUILDING A SUBSTRUCTURE FOR AN ARTIFICIAL GRASS COURT AND AN ARTIFICIAL GRASS FIELD INSTALLED ONTO IT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8303018A NL8303018A (en) 1983-08-30 1983-08-30 METHOD FOR APPLYING A SUBSTRUCTURE STRUCTURE FOR AN ARTIFICIAL GRASS FIELD AND ARTIFICIAL GRASS FIELD APPLIED TO SUCH SUBSTRUCTURE CONSTRUCTION.
NL8303018 1983-08-30

Publications (2)

Publication Number Publication Date
EP0136747A1 EP0136747A1 (en) 1985-04-10
EP0136747B1 true EP0136747B1 (en) 1986-12-30

Family

ID=19842324

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84201229A Expired EP0136747B1 (en) 1983-08-30 1984-08-28 Method of providing a substructure for an artificial grass field and artificial grass field applied to such a substructure

Country Status (4)

Country Link
EP (1) EP0136747B1 (en)
AT (1) ATE24560T1 (en)
DE (1) DE3461839D1 (en)
NL (1) NL8303018A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9011740B2 (en) 2008-12-15 2015-04-21 Textile Management Associates, Inc. Method of recycling synthetic turf and infill product
US10781569B2 (en) 2011-07-21 2020-09-22 Fiberweb Holdings Limited Confinement structures—DefenCell plastic gabion system

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8501610A (en) * 1985-06-04 1987-01-02 Hollandsche Betongroep Nv SPORTS FIELD.
GB8619850D0 (en) * 1985-12-14 1986-09-24 Mansfield Standard Sand Co Ltd All weather surfaces
NL8602322A (en) * 1986-09-15 1988-04-05 Heijmans Wegenbouwmij METHOD FOR APPLYING A SUBSTRUCTURE STRUCTURE FOR AN ARTIFICIAL GRASS FIELD AND ARTIFICIAL GRASS FIELD WITH SUCH A SUBSTRUCTURE STRUCTURE.
US4790691A (en) * 1986-10-03 1988-12-13 Freed W Wayne Fiber reinforced soil and method
NL8802671A (en) * 1988-11-01 1990-06-01 Heijmans Wegenbouwmij SUBSTRUCTURE STRUCTURE FOR AN ARTIFICIAL GRASS FIELD AND ARTIFICIAL GRASS FIELD WITH SUCH A SUBSTRUCTURE STRUCTURE.
FR2661699B1 (en) * 1990-05-03 1992-08-28 Scetauroute PROCESS FOR THE PRODUCTION OF LAYERED LAYER LAYERS.
FR2707093B1 (en) * 1993-06-30 1995-09-29 Genser Franck Artificial surface in particular suitable for making horse tracks and method for obtaining such a surface.
US6042305A (en) * 1997-08-15 2000-03-28 Ppg Industries Ohio, Inc. Fiber-reinforced soil mixtures
FR2785918B1 (en) 1998-11-16 2001-01-19 Gregori Internat Sa MACHINE FOR MAKING A HOMOGENEOUS MIXTURE DOSE OF AT LEAST ONE DIVIDED MATERIAL AND AT LEAST ONE FIBROUS MATERIAL AND ALLOWING THE DEPOSITION IN LAYER OF THE SAID MIXTURE ON THE GROUND
FR2833626A1 (en) 2001-12-18 2003-06-20 Gregori Internat Sa Machine for spreading layer of finely-divided material such as sand mixed with short fibres comprises bin, fibre carding unit, mixer and conveyors
GB0804487D0 (en) 2008-03-11 2008-04-16 Terram Ltd Cellular structures
NL2003889C2 (en) * 2009-12-01 2011-06-06 Oranjewoud Realisatie B V FOUNDATION FOR A SPORTS FIELD, SPORTS FIELD AND METHOD FOR MANUFACTURING THEM.
NL1038031C2 (en) * 2010-06-11 2011-12-19 Spekpannekoek B V ARTIFICIAL GRASS SPORT FIELD.
US10066344B2 (en) 2011-03-14 2018-09-04 Rockwool International A/S Method of making an equestrian surface using stone fibers

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6806970A (en) * 1968-05-17 1969-06-25
US3934421A (en) * 1972-12-15 1976-01-27 Akzona Incorporated Ground stabilization matting
US4044179A (en) * 1975-11-18 1977-08-23 Mod-Sod Sport Surfaces Playing surface for athletic games
US4336286A (en) * 1980-11-26 1982-06-22 Tomarin Seymour A Tennis court surface with sand topdressing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9011740B2 (en) 2008-12-15 2015-04-21 Textile Management Associates, Inc. Method of recycling synthetic turf and infill product
US10781569B2 (en) 2011-07-21 2020-09-22 Fiberweb Holdings Limited Confinement structures—DefenCell plastic gabion system

Also Published As

Publication number Publication date
NL8303018A (en) 1985-03-18
DE3461839D1 (en) 1987-02-05
ATE24560T1 (en) 1987-01-15
EP0136747A1 (en) 1985-04-10

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