Separation layer for laying grass-surfaces on sand-and/or gravel

Details Separation layer for laying grass-surfaces on sand-and/or gravel Separation layer for laying grass-surfaces on sand-and/or gravel

1994-05-13

1995-10-24

Loney, Donald J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Nonplanar uniform thickness material

428 17, 428166, 428172, 428174, 428188, 405 36, 405 38, 521695, A01N 300, B32B 328

Patent

active

054608678

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a separation layer for laying grass surfaces on a sand and/or gravel base, which layer is in the form of a rigid plastic sheeting with parallel side edges. The invention further relates to uses of this separation layer for laying grass surfaces on a sand and/or gravel base.


BACKGROUND OF THE INVENTION

The laying of artificial or natural grass for various sporting purposes invariably results in high costs. The result is primarily dependent upon how well the under surface or base has been prepared. For example it is important that the drainage is adequate. In addition the outer layer of sand and gravel must be separated from layers of clay beneath so that these do not migrate upwards and damage the grass layer. There are various types of separation layers for this purpose, for example so called geo-textile which forms a barrier layer between for example clay and macadam.
When laying artificial grass surfaces, for example for football or tennis, the artificial grass is laid upon a drainage rubber matting, so called Dimple Pad. Up until now attempts to lay this matting (artificial grass and Dimple Pad) directly onto a sand/gravel base have been shown to give rise to problems in the form of abrasion damage to the rubber matting. Should this wear become such that holes are created in the matting, this will be clearly noticed because a ball will bounce irregularly. In addition the damage can propagate upwardly into the supporting layer of the artificial grass whereby players can be seriously injured should the studs snag in the damage.
Known geo-textiles have not been able to withstand the stresses which arise in this special area of use. It is thus common that this type of artificial grass is laid on an asphalt base which is, of course considerably more expensive than sand or gravel.


TECHNICAL PROBLEM

An object with the present invention is thus to provide a separation layer which permits the laying of grass surfaces on a sand or gravel base which avoids the above described problems. A second object with the invention is to indicate uses of the separation layer for laying of artificial and natural grass surfaces on a sand or gravel base and possibly with an internal heat exchange surface.


SOLUTION

The object is achieved according to the present invention by means of the surface of the sheeting being embossed by thermo-forming so that it presents a uniform pattern of deep embossings which form rows which extend perpendicularly to said side edges, wherein the parallel rows are each connected to adjacent embossings in the same row via bridges so that each row of embossings in cooperation with adjacent rows creates stiffening of the sheeting.
When using the separation layer for laying of an artificial grass surface on a sand or gravel base, the layer lays on the sand or gravel base and a drainage layer in the form of a drainage rubber matting rests on top of the separation layer and the artificial grass lays on top of the drainage layer.
When using the separation layer for laying of a natural grass surface on a sand or gravel base, the separation layer lays on the sand or gravel base and a layer of soil rests on top of the separation layer and the natural grass is laid on top of the soil layer.
When using the separation layer for laying a heat exchange surface which is covered by a grass surface, at least two separation layers lie on top of one another on the sand or gravel base with crossing bridges and a heat transferring medium is passed through the space between the two separation layers which form the base for the grass surface.


BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the invention will now be described with reference to the attached drawings in which
FIG. 1 is a vertical cross-section through an artificial grass matting according to the invention,
FIG. 2 is a vertical cross-section through a natural grass matting according to the invention,
FIG. 3 is a plan view of an artificial grass matting according to the invention with heat exchange pr

REFERENCES:
patent: 4639165 (1986-01-01), Flectnoe-Brown
patent: 4840515 (1989-06-01), Freese
patent: 4889758 (1989-12-01), Rinkwich
patent: 4917933 (1990-04-01), Schluter
patent: 5399406 (1995-03-01), Matsuu et al.

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