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Specifications

Designing a pitch in PowerGrass is easy, but don't underestimate the agronomic aspect.

The design of POWERgrass follows the guidelines for the construction of natural grass pitches for professional use. Everything has been designed to optimise the investment, using quality materials.

During the feasibility study, it's important to study the climate of the area, the type of soil and water quality for irrigation. FIFA's guide for Natural Grass pitches is meant to supply the general guidelines in order to approach the project.

It's also important to understand the customer's needs and the availability of competent staff throughout the year. The maintenance of POWERgrass is not complex and much easier than pure natural, but requires a certain consistency.

A skilled person, faces no difficulty in maintaining a field in POWERgrass. It does not require more effort than the synthetic pitch, if the mowing is done with the robot CutCat, but you can not think about performing maintenance on an occasional basis.

Maintenance cost affects little, but it must be ensured constancy, as well as technical skills, during the growing period of natural grass.

The drainage system is critical to remove the excess of rainwater and disperses a part to the underlying soil to avoid burdening the capacity of the sewage system. In some cases the roots reach the drainage layer and can absorb water into the underlying soil, thereby the most precious resource is saved.

Installing an effective drainage system is very easy. Install the main drainage systems after primary level and settle the base soil of the excavation with two or four gradients. Then excavate a trench up to 50 cm deep around the entire perimeter of the area to be drained. Having to disperse the water along to the trench is sufficient to maintain the same depth level of the trench. The next step, is posing a corrugated tube draining of 160 mm which is covered with crushed gravel up to the surface. The discharge of excess water can be drained directly into the aquifer through a sump or directly in the drainage of rainwater.

The wells for the inspection, are not essential, but it is advisable to carry one, every time the pipe changes direction and every 30 meters along a level surface. The drainage channels are of low need as well, as the background absorbs water which is dispersed or removes through the pipes, but if your budget allows, and if the area is prone to heavy rainfall or is subject to heavy snowfall, the drainage channel assists water collection flowing on the surface.

Then you need to realize the secondary drainage system dividing the field long each of the two axes approximately every 6 meters, then draw a diagonal to the first point of the vertical axis with the first point of the horizontal axis, and so on until the end. Diagonal drains can be achieved with mini excavator or chain excavator with section size between 12 and 30 cm and up to 35 cm deep. Next thing is posing a corrugated tube drainage from 90 mm ​​that is covered with crushed gravel up to the surface.

Depending on the type of the background (if water infiltration is high or not), the rainfall in the area (light or heavy rain) and the available budget we must choose between a) a complete layer of crushed gravel over the entire surface or b) additional slit drain in distance 25-50 cm dug with proper equipment and filled with coarse and very coarse sand.

The irrigation system with 24 or 35 pop-up sprinklers of medium-range is designed to distribute the water with lighter drops and more uniform than those at long range and rationalise better the consuption of the water.

At the top of the sprinkler shall be a small soft rubber cup to contain a small natural grass sod installed on the same level of the pitch.

The sprinklers can be connected to a solenoid valve singly or two sprinklers in the same valve. In the second case one must take into account a) to connect the sprinklers with a radius of action homogeneous, for example in a football field normally there are sprinklers with three different radii of action at 90°, 180° or 360° and b) combine sprinklers possibly non-contiguous areas as a good rule of thumb is to alternate the irrigated areas to make sure that the water in the previous area or sprinkler penetrate the soil.

Programming is done with a control unit by starting 1, 2 or 4 sprinklers together depending on the number of valves, the amount and pressure of the water available.

POWERgrass hybrid grass system consists in:

A. a synthetic turf with fibres height 60 mm, disposed in 6300 tufts ≈ 75600 monofilaments per sqm. The fibres tufts are bound on the backing with tearing resistance ≥35 N by the technology LC-HM without obstructing the permeability and the softness of the backing. The synthetic turf is pliable to 180° on each intersection between the knots and remain elastic to the players pressure. The backing must be robust with resistance ≥500 N and the seams of the synthetic turf rolls are stitched together to permit easy installation and long duration.

  • The fibres of 18000 dtex are composed from 6 strong with soft touch monofilaments of two colour and they look like natural grass because of their undulated shape offering aesthetic appearance. The filaments section has a width of 1400 microns and thickness that is progressively strengthen from the edges of 200 microns to the centre spine of 350 microns. The filaments resilience is ≥2.50 cN (calculated at 300 cycles with the Favimat R Textechno method).
  • The backing comprises a imputrescible mesh with high porosity for about 320.000 voids/sqm with irregular 3D shapes to permit air circulation and roots penetration and to limit the sand migration. The mesh is ladder-proof to maintain its structure after multiplying perforations to aerate the root zone below. It comprises also a thin geotextile providing an insulating effect to mitigate heat and frost stress.

B. a substrate based on silica sand mixed, in volume 20-25%, with ZOEsand, a mineral-organic soil conditioner. After the synthetic turf rolls are stitched, the synthetic turf is filled and raked with cork for about 7 mm and then is filled and raked gradually with the same mix of before (sand premixed with ZOEsand), until the formation of an infill layer of 35 mm, thus to provide the best interaction of the athlete's stud with the surface.

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