Sports field with natural grass and artificial grass and a method for laying same

Claim 2

Sports field comprising a foundation which bears an artificial grass surface and which is rooted with roots of grass plants passing through the artificial grass surface.

Claim 3

Sports field as claimed in claim 1, wherein openings for the grass plants are present in the artificial grass.

Claim 4

Sports field as claimed in claim 2, wherein the artificial grass is provided with a tuft cloth and the open­ings are formed from yarn threads and/or weft threads missing in the tuft cloth.

Claim 5

Sports field as claimed in claim 3, wherein yarn threads and/or weft threads adjoining the openings have a greater diameter than other tuft cloth threads.

Claim 6

Sports field as claimed in claims 1-4, wherein 30-­60% of the surface of the artificial grass consists of open­ings for the grass plants.

Claim 7

Sports field as claimed in claims 1-5, wherein the artificial grass consists of straight and/or frizzed fibres with a fibre length of 15-35 mm.

Claim 8

Sports field as claimed in claims 1-6, wherein the foundation comprises sand with a humus content of 2-8% by weight.

Claim 9

Sports field as claimed in claim 7, wherein the foundation comprises a mixture of sand and particle-form material with hooking resistance, which mixture contains 2-8% by weight of humus material.

Claim 10

Sports field as claimed in claim 8, wherein the foundation mixture contains sand and particle-form material in a weight ratio of 60-30 to 40-70.

Claim 11

Sports field as claimed in claim 9, wherein the particle-form material comprises lava and steagran™.

Claim 12

Sports field as claimed in claims 8-10, wherein damping, particle-form material is added to the mixture in a quantity of 15-60% by weight.

Claim 13

Sports field as claimed in claim 11, wherein the damping material consists of rubber particles.

Claim 14

Sports field as claimed in claims 9-12, wherein the sand consists of low-grade earth with a humus content of 2-8% by weight.

Claim 15

Sports field as claimed in claims 1-13, wherein between the artificial grass and the foundation is arranged a germinating bed layer for grass seed.

Claim 16

Method for laying a sports field as claimed in claims 1-13, comprising the steps of: i) arranging the foundation on a ground; ii) arranging a layer containing grass seed on the founda­tion; iii) laying out the artificial grass over the grass seed layer; iv) allowing the grass seed to germinate; v) strewing sand into the artificial grass; and vi) mowing the grass plants to a length that is greater than the length of the artificial grass fibres.

Claim 17

Method as claimed in claim 15, wherein in step ii) grass seed is sown on the foundation in a quantity of 100-600 kg per hectare.

Claim 18

Method as claimed in claim 15, wherein in step ii) a germinating layer containing grass seed is laid out on the foundation.

Claim 19

Method for laying a sports field as claimed in claims 1-14, comprising the steps of: i) arranging the foundation on an underlayer; ii) laying out the artificial grass on the foundation; iii) sowing grass seed in the artificial grass; iv) strewing sand at least partially into the artificial grass; and v) mowing the grass plants to a length that is greater than the length of the artificial grass fibres.

Claim 20

Method as claimed in claims 15-18 wherein the artifi­cial grass is strewn with sand that contains 1-2% of humus material.