Trávnaté plochy pre podujatia a festivaly
Terén, ktorý zvládne prípravu, podujatie aj demontáž
Podujatia neničia polia. Ničí ich montážny týždeň. Mriežky IBRAN spevňujú terén práve tam, kde prebieha ťažká prevádzka – plocha zvládne nápor a pôda sa po skončení vráti do pôvodného stavu.
Prečo je tu spevnenie nevyhnutné
Kto prevádzkuje eventové polia, vie, čo ich skutočne zničí. Zriedkakedy je to dav. Problémom sú dva týždne okolo podujatia: nákladné súpravy s pódiom, teleskopické manipulátory jazdiac tam a späť, agregátorové vozidlá, sanitárne kontajnery – a to všetko na mäkkom teréne za akéhokoľvek počasia.
Pešia premávka poškodzuje terén sústredene – pri vstupoch, pred pódiami, pozdĺž frekventovaných trás medzi arénami – no ľudia sa rozptýlia a tráva sa zotaví. Vozidlá sa nerozptýlia. Jazdia po rovnakej trase na rovnaké miesto, otáčajú sa na rovnakom bode, a ak je terén mokrý, vykoľají ho raz a navždy.
Spevnenie terénu mení ekonomiku celého podujatia. Trasy a stanovištia zostávajú použiteľné aj za zlého počasia, takže montáž nestagnuje. Pôda nie je rozbahnená, čím sa znižujú alebo úplne eliminujú náklady na obnovu. A terén je pripravený na ďalšie podujatie bez ročnej prestávky.
Kde to funguje najlepšie
- Vozidlové trasy a prevádzkové komunikácie po celom areáli
- Produkčné a umelecké zázemie
- Základne pódia, stanov a konštrukcií
- Stanovištia agregátorov, sanitárnych a obytných kontajnerov
- Vstupné brány a úzke miesta
- Bary, food courty a plochy s vysokou koncentráciou návštevníkov
- Záložné parkoviská a prístupové trasy do kempingov
- Trasy záchranných a zdravotníckych vozidiel
Prehľad parametrov
| Podkladová vrstva | 150–250 mm drenážneho štrkového lôžka pre vozidlové trasy. Menej tam, kde zaťaženie je len pešie |
| Výplň | Piesočnatý substrát pre trávnik, alebo triedená zmes 6–20 mm pre zázemie a stanovištia |
| Typické zaťaženie | Nákladné súpravy, teleskopické manipulátory, žeriavy, kontajnery, agregátory, davy |
| Vzhľad | Trávnatá výplň zachováva charakter poľa aj medzi podujatiami |
| Použiteľnosť | Použiteľné za mokra – montáž a demontáž nie sú závislé od počasia |
| Priepustnosť | Plne priepustné. Voda odteká namiesto toho, aby sa hromadila pred pódiom |
| Životnosť | 25 rokov pri dokumentovanej inštalácii |
| Materiál | 100% recyklovaný polypropylén, vyrobený v EÚ z recyklovaných polymérov |
Trvalé spevnenie alebo dočasné pojazdné panely?
Väčšina eventových areálov si prenajíma dočasné pojazdné panely, a pre jednorazové podujatie na neznámom poli je to správna voľba. Pre areál, ktorý hostí podujatia rok čo rok, sa však matematika mení.
Dočasné panely sú opakujúci sa náklad s opakujúcou sa prácou: prídu, uložia sa, zdvihnú sa, odídu a budúci rok platíte znova. Navyše ich treba uložiť skôr, než sa počasie zhorší, čo znamená záväzok vopred bez ohľadu na to, či ich skutočne potrebujete.
Trvalé spevnenie je jedna inštalácia, ktorá je jednoducho na mieste. Tráva cez ňu prerastie, pole vyzerá ako pole a každé ďalšie podujatie využíva terén, ktorý je už pripravený. Na trasách a stanovištiach, ktoré sa používajú pri každom podujatí, je to zvyčajne lacnejšie riešenie už po niekoľkých sezónach – a z každej montáže odpadá jedna logistická úloha.
Rozumný prístup vo väčšine areálov kombinuje oboje: trvalé spevnenie na pevnej infraštruktúre, ktorá sa nemení, a dočasné panely pre časti, ktoré sa s každým rozložením podujatia menia.
Ktorá hĺbka mriežky?
Číslo na mriežke vyjadruje hĺbku uzavretej vrstvy. V eventovom areáli sa riadi montážnou premávkou, nie samotným podujatím.
- IBRAN®-X50 odporúčame pre vozidlové trasy, zázemie a základne konštrukcií. Montážna premávka je ťažká, otáča sa a prichádza za akýchkoľvek podmienok terénu.
- IBRAN®-X40 pre ľahšie trasy, záložné parkoviská a zmiešané plochy s pešou a ľahkou vozidlovou premávkou.
- IBRAN®-X30 pre pešie plochy, chodníky a kempingové plochy, kde je potrebné udržať minimálnu hrúbku skladby.
Navrhujte podľa najťažšieho vozidla v montážnom harmonograme, nie podľa priemerného. Na väčšine areálov je to naložená nákladná súprava alebo teleskopický manipulátor – a obe sa otáčajú.
Výber výplne
Pre plochy, ktoré musia zostať zelené medzi podujatiami, použite piesočnatý substrát vyplnený po hornú hranu buniek s odolnou trávnikovou zmesou. Pole vyzerá ako lúka alebo park päťdesiat týždňov v roku a zvládne podujatie počas zvyšných dvoch.
Pre zázemie, stanovištia a trvalé prevádzkové trasy použite triedenú zmes 6–20 mm, hranatú a čistú. Zmes sa ukladá tesnejšie ako jednotná frakcia, pretože menší kameň vypĺňa medzery medzi väčším – plne vyplnená bunka prenáša zaťaženie cez kameň, nie cez plast. Výsledkom je pevný a predvídateľný povrch pre kontajnery, agregátory a skladovaný materiál.
Kde by kamenný povrch pôsobil nevhodne, pamätajte, že ho možno zakryť: kamenná výplň trasy pod tenkou vrstvou trávnika alebo rohože počas podujatia poskytuje konštrukčný povrch aj požadovaný vzhľad v deň akcie.
How it goes in
- Map the fixed infrastructure first. Every site has routes, gates and compounds that are in the same place every year. Those are what to reinforce; the rest changes with each layout.
- Set out and establish falls. Event fields are often the flattest land available, which means water has nowhere obvious to go. Decide where it goes before you build.
- Strip turf and topsoil to a firm formation, removing soft spots rather than building over them.
- Lay a woven geotextile across the formation, lapping joins by at least 300mm. On agricultural ground this is structural, stopping the sub-base punching down into soft subsoil.
- Lay and compact an open-graded sub-base in 50mm layers, to a depth set by the heaviest vehicle in the build schedule.
- Blind with a thin levelling layer and screed flat.
- Push-fit the grids together, staggering the joints, and cut around gateposts, services and existing drainage.
- Restrain the edges, particularly along routes, where vehicles will otherwise clip the edge and drag the outer grids sideways.
- Fill the cells level with the cell tops and brush in. Seed or turf grass areas and allow a full growing season before the first event where you can.
Full step-by-step detail is in our grass grid installation guide.
Planning the build, not the event
The single most useful exercise is to walk the site with the build schedule rather than the event plan.
Where does the first artic go, and what does it drive over to get there? Where does the telehandler spend the week? Where do the cabins land, and what route did they come in on? Which gate takes every delivery, and where does a lorry turn round when it has unloaded?
Those answers give you a map of the ground that takes real punishment, and it is usually a surprisingly small proportion of the site. Reinforcing it costs a fraction of surfacing broadly and fixes most of the damage, because the damage is concentrated exactly where the heavy plant repeats the same movements.
Add the emergency and medical routes to that map. Those have to work regardless of weather, and unlike the rest of the schedule you do not get to reschedule them.
Crowd areas and pinch points
Foot traffic does not rut ground the way vehicles do, but it destroys grass where it concentrates: entrance gates, the front of a stage, bar frontages, the route between two arenas, and the toilets.
Those areas turn to mud through sheer repetition, and once they do they become both a welfare problem and a reputational one, since mud is what ends up in the photographs.
Reinforcement keeps the ground firm and free-draining under crowd loading, so a wet weekend produces a damp field rather than a quagmire. For sites that market themselves on comfort, that is worth more than the construction cost.
Handing the land back
Many event fields are rented, borrowed or dual-purpose: grazing, sports pitch, parkland, farmland. The obligation to return them in good condition is often the binding constraint on whether an event can happen at all.
A grass-filled grid is invisible once established, so the land continues in its normal use between events. It stays fully permeable, so it does not change drainage on the holding. And because the ground is not churned, reinstatement after each event is minor rather than a major earthworks job.
If you are negotiating a multi-year agreement with a landowner, the ability to say the ground will not be damaged is a considerably stronger position than promising to repair it afterwards.
Get it right first time
The one thing worth knowing: build for the wettest version of your build week.
Every event site is specified against a reasonable weather assumption, and then one year it rains for the entire build. That is the week that decides whether the ground survives, because a heavy vehicle on saturated ground does more damage in one pass than a hundred passes in the dry.
Specify the routes and compounds for the bad year rather than the average one. It costs a little more once, and it removes the scenario where the build stalls, the ground is destroyed, and the reinstatement bill arrives on top of an event that already went badly.
Ask our engineer
Questions about depths, which areas to reinforce, or how this compares to trackway hire? Ask below, or get in touch directly.
Design your surface
Set out the area, choose a grid and an infill, and see the finished surface. The schedule and the specification follow.
Permeable surface specification
Schedule
Assumptions
Specification
Common Questions
What actually damages an event field?
Rarely the crowd. It is the fortnight either side: artics delivering staging, telehandlers running back and forth, generator trucks and welfare units, all on soft ground in whatever weather turns up.
People spread out and grass recovers, but vehicles follow the same route to the same compound and turn at the same point, and on wet ground that is what does the lasting damage.
Is permanent reinforcement better than hiring trackway?
For a one-off in an unfamiliar field, trackway is the right answer. For a site hosting events year after year, permanent reinforcement on the routes and compounds that never move is usually cheaper within a few seasons and removes a logistics job from every build.
Most sites end up doing both: permanent reinforcement on fixed infrastructure, trackway for whatever changes with each layout.
Which areas of a site should be reinforced?
Walk the site with the build schedule rather than the event plan. Where does the first artic go and what does it drive over? Where does the telehandler spend the week? Which gate takes every delivery and where does a lorry turn round?
That map is usually a surprisingly small proportion of the site, and it is where the damage concentrates. Add the emergency and medical routes, because those have to work regardless of weather.
Which grid depth does an event site need?
The 50mm grid for vehicle routes, compounds and structure standings, because build traffic is heavy, it turns, and it arrives whatever the ground conditions. The 40mm for lighter routes, overflow parking and mixed pedestrian and light vehicle areas. The 30mm for pedestrian areas and camping ground where the build-up needs to stay shallow.
Specify against the heaviest vehicle in the build schedule, not the average one.
Will the field still look like a field between events?
With a grass fill, yes. Grass grows up over the cell tops and the reinforcement is invisible once established, so the land continues in its normal use as grazing, sports pitch or parkland.
Mowers pass straight over because the cell tops sit below the growing crown.
Does reinforcement help with crowd areas and mud?
Yes. Foot traffic destroys grass where it concentrates: entrance gates, the front of a stage, bar frontages, routes between arenas and the toilets.
Reinforcement keeps those areas firm and free-draining under crowd loading, so a wet weekend produces a damp field rather than a quagmire. For sites that market themselves on comfort, that is often worth more than the construction cost.
What should event site grids be filled with?
A sand-dominant rootzone with a hard-wearing amenity seed mix for areas that must stay green between events. A 6-20mm angular graded blend for compounds, standings and permanent haul routes, where a firm predictable surface matters more than appearance.
Where a stone route needs to look right on the day, it can be topped with turf or matting for the event.
How long before a new installation can host an event?
For grass areas, allow a full growing season before the first event where the programme permits, because the surface is only as strong as the root structure holding the rootzone together.
Stone-filled compounds and routes are usable as soon as they are laid and filled. Where time is short, use turf rather than seed and phase the areas that establish first.
Does it help when the land is rented or dual-purpose?
Considerably. Many event fields are grazing, sports pitch or farmland, and the obligation to return them in good condition often decides whether an event can happen at all.
Because the ground is not churned, reinstatement after each event is minor rather than a major earthworks job, and being able to tell a landowner the ground will not be damaged is a stronger position than promising to repair it.
Will it work if the build week is wet?
That is the case to specify for. A heavy vehicle on saturated ground does more damage in one pass than a hundred passes in the dry, so build the routes and compounds for the bad year rather than the average one.
A reinforced, fully permeable surface stays usable when the surrounding ground does not, which keeps the build on schedule rather than stalling it.
Ask our engineer
Questions about depths, sub-base, edging or which system fits your project? Ask below.
