Caminos Agrícolas y Accesos de Campo - IBRAN-X®
El acceso es el punto más castigado. Las rejillas IBRAN retienen el árido para que las entradas de campo y los caminos de acceso agrícolas se mantengan firmes durante la cosecha, el ensilado y un invierno húmedo, sin necesidad de reponer zahorra cada primavera.
Por qué importa la estabilización aquí
La entrada a un campo es el tramo más exigente de toda la explotación. Cada vehículo que trabaja esa parcela pasa por el mismo punto: tractores, remolques, cisternas, la cosechadora del contratista, el veterinario, el camión de pienso. Llegan desde una vía pavimentada, giran con carga y descargan su peso sobre un terreno que nunca fue diseñado para soportarlos.
Luego llueve. El acceso se encharca, retiene el agua y se convierte en el barro profundo que te cuesta tiempo en cada movimiento. La zahorra vertida sobre él desaparece en una temporada, porque el árido suelto bajo un neumático de tractor en giro simplemente se desplaza lateralmente y se hunde en el terreno blando que hay debajo.
Una rejilla alveolar cambia eso. El árido queda retenido en celdas cerradas y no puede desplazarse lateralmente ni hundirse en la explanada; la carga se transfiere a través del árido hacia el terreno en lugar de expulsarlo. El acceso permanece donde lo construiste.
Lo mismo ocurre a lo largo del camino. El árido confinado no migra hacia los márgenes, por lo que se eliminan las labores de renivelación y se deja de comprar la misma tonelada dos veces.
Aplicaciones habituales
- Entradas de campo y portones de acceso
- Caminos de acceso agrícolas y rutas de cabecera
- Accesos a explanadas y zonas de maniobra
- Portones de ganado y cruces de manga
- Acceso a silos y zonas de almacenamiento de forraje
- Plataformas de bebederos y comederos circulares
- Acceso a instalaciones solares y de suministros en suelo agrícola
- Accesos temporales y estacionales que deben ser restituidos
Resumen técnico
| Subbase | 150-250mm de zahorra compactada, mayor espesor en terrenos blandos o turbosos |
| Relleno | Mezcla graduada 6-20mm, gravilla angular y limpia, enrasada más 5-10mm de capa de sellado superficial |
| Cargas típicas | Tractores y remolques cargados, cisternas de purín, cosechadoras, camiones de pienso |
| Ganado | Apto para portones de bovino y ovino. Superficie firme, sin encharcamiento, sin barro |
| Barro en la vía pública | Una entrada firme y drenante arrastra mucho menos barro a la carretera |
| Drenaje | Totalmente permeable al agua. El agua se infiltra en lugar de acumularse en el acceso |
| Vida útil de diseño | 25 años, con instalación documentada |
| Material | 100% polipropileno reciclado, fabricado en la UE a partir de polímeros reciclados |
El problema del portón de acceso
Vale la pena concretar por qué los accesos fallan cuando el camino a ambos lados aguanta.
En un portón de acceso ocurren tres cosas que no suceden en ningún otro punto. El tráfico se concentra: cada movimiento de entrada y salida de esa parcela pasa por los mismos cuatro metros. Los vehículos giran: la dirección bajo carga con el neumático apenas rodando desgasta la superficie en lugar de simplemente cruzarla. Y existe una transición, de una superficie firme a una blanda, exactamente donde la carga es mayor.
Por eso un portón puede absorber veinte toneladas de árido y seguir siendo un lodazal en febrero. El árido nunca estuvo confinado, así que cada neumático en giro lo trabajó lateralmente y hacia abajo, hundiéndolo en un terreno que ya estaba blando.
Confínalo y la misma cantidad dura décadas. Son los metros cuadrados con mayor retorno de inversión de toda la explotación si se hacen bien.
¿Qué profundidad de rejilla elegir?
El número de una rejilla determina la profundidad de la capa de árido confinado. En terreno agrícola, donde los vehículos son pesados y la explanada suele ser blanda, la respuesta honesta es casi siempre mayor profundidad.
- IBRAN®-X50 es nuestra recomendación para portones, caminos con remolques cargados y cisternas, y cualquier punto donde la maquinaria gire bajo carga. Una capa confinada más profunda distribuye la carga sobre una huella mayor antes de que llegue a la subbase.
- IBRAN®-X40 para usos más ligeros: rutas de quad y ATV, tráfico peatonal y de ganado, caminos de cabecera con paso ocasional de vehículos fuera de campaña.
- IBRAN®-X30 cuando se coloca sobre un camino existente consolidado, o cuando la cota del acceso debe coincidir con la de una vía adyacente.
Si dudas entre dos opciones en un portón, elige la de mayor capacidad portante. Ese es el punto que falla, y falla en el peor momento del año.
Elección del árido
Utiliza una mezcla graduada de 6-20mm, gravilla angular y limpia. La mayoría de las recomendaciones apuntan a un tamaño único, y un tamaño único deja huecos: el árido uniforme se apoya sobre sí mismo y nunca llega a compactarse del todo. Una mezcla rellena esos huecos, porque el árido más fino se encaja entre el más grueso.
Una celda completamente rellena transfiere la carga a través del árido hacia el terreno. Una celda parcialmente rellena la transfiere a través del plástico, y bajo el neumático de un remolque cargado esa diferencia se nota rápidamente.
Solicita a tu proveedor árido graduado lavado, angular en lugar de redondeado. Evita los finos y los rechazos de machaqueo: ligan la superficie e impiden el drenaje, lo que en un acceso anula completamente el propósito. Si no drena, retendrá agua, y si retiene agua volverá a ser un lodazal.
How it goes in
- Set out the area and work out where water currently goes. A gateway is usually the low point of both the field and the road, so it collects from both. Decide now whether you need a cross-fall, a French drain across the entrance, or simply somewhere for it to soak away.
- Dig out the mud. This is the step people skip and it is the one that matters most: soft, poached ground has no bearing capacity, and building on it just buries the problem deeper. Excavate to firm subsoil, however far down that is.
- Lay a woven geotextile across the formation, lapping joins by at least 300mm. On soft agricultural ground this is structural: it stops the sub-base punching down into wet subsoil and stops soil pumping up into your stone.
- Lay and compact the sub-base in 50mm layers. On very soft or peaty ground you may need more depth than a road would take, because you are building a raft rather than a surface.
- Blind with a thin layer of grit sand and screed it level.
- Push-fit the grids together, working from one edge and staggering the joints. Cut to line at the gateposts and verges with a saw.
- Restrain the edges. On a gateway, run the grids wider than the gap itself so the edge restraint sits outside the line the tyres actually take.
- Fill the cells with a 6-20mm graded blend, level plus a 5-10mm blinding, brushing it in so no cell is left hollow.
Full step-by-step detail is in our gravel grid installation guide.
How far into the field?
Further than you think. The instinct is to surface the gap between the posts and stop, but the damage does not stop there.
Vehicles turn as they enter and exit, so the worn area fans out into the field well past the gateway itself. Surface only the gap and you move the mud hole two metres, then have to drive through it to reach the good bit.
As a working rule, extend at least a tractor and trailer length into the field, and wider than the gate opening on both sides. On a busy entrance, take it as far as the turning circle of your largest vehicle. It is the difference between an entrance that works and one that only looks like it does.
Mud on the road
Depositing mud on the public highway is your responsibility, and a wet gateway is where most of it comes from. Tyres pick it up in the entrance and drop it on the road for the next hundred metres.
A firm, free-draining entrance largely removes the source. There is no standing mud for tyres to load up with, so far less leaves the field in the first place. It will not eliminate cleaning duties during a wet harvest, but it changes the scale of the problem, and it takes away the entrance as the cause.
Livestock gateways
Cattle do to a gateway what tractors do, only more often and with higher pressure per hoof. A herd moving twice a day through the same gap will poach it into a slurry whatever the weather does.
A grid surface gives firm footing that drains, which reduces lameness risk and stops the gateway becoming the place stock refuse to walk. Fill level and brush it in well: a smooth, evenly packed surface is what you want underfoot, not proud stone.
Get it right first time
The one thing worth knowing: dig the mud out first.
Every failed gateway on every farm has the same history. Someone tipped stone into a wet hole because it was quicker than excavating, the stone sank into the soft ground over one winter, and by the next year the hole was back and deeper.
Stone laid on mud becomes mud. Excavate to firm ground, get the membrane in, build the sub-base in layers, and the surface above it will still be there in twenty years. Skip it and you will be doing the same job again next autumn, in worse weather, with the harvest waiting.
Ask our engineer
Questions about depths, sub-base, how far to extend an entrance, or which system fits your ground? 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
Why does my field entrance keep turning to mud?
Three things happen in a gateway that happen nowhere else. Every movement in and out of the field funnels through the same few metres, vehicles turn under load so the tyre grinds rather than rolls, and there is a transition from a firm surface to a soft one exactly where the load is highest.
Loose stone tipped in gets worked sideways and pressed down into the soft ground beneath, so it disappears within a season. Confining the stone in a cellular grid stops that happening.
Do I need to dig out the mud before laying grids?
Yes, and it is the step that matters most. Soft, poached ground has no bearing capacity, so building on it just buries the problem deeper.
Excavate to firm subsoil however far down that is, lay a woven geotextile, then build the sub-base in compacted layers. Stone laid on mud becomes mud.
How far into the field should I surface a gateway?
Further than the gap itself. Vehicles turn as they enter and exit, so the worn area fans out well past the gateway.
As a working rule, extend at least a tractor and trailer length into the field and wider than the gate opening on both sides. Surface only the gap and you move the mud hole two metres, then have to drive through it to reach the good bit.
Will grids take a loaded trailer, tanker or combine?
Yes, when the sub-base and grid depth are specified for it. The 50mm grid is our recommendation for gateways and tracks carrying loaded trailers and tankers, and anywhere plant turns under load.
Build for the heaviest vehicle that uses the entrance, not the everyday one, because it is the harvest and silage movements that do the damage.
Are grids suitable for livestock gateways?
Yes. Cattle poach a gateway faster than machinery does, because a herd moves through the same gap twice a day at high pressure per hoof.
A grid surface gives firm footing that drains, which reduces lameness risk and stops the gateway becoming the place stock refuse to walk. Fill level and brush it in well so the surface is smooth underfoot rather than proud.
Will this stop mud getting onto the road?
It removes most of the source. Tyres pick mud up in a wet entrance and drop it on the highway for the next hundred metres. A firm, free-draining gateway means there is no standing mud to load up with, so far less leaves the field.
It will not eliminate cleaning duties during a wet harvest, but it changes the scale of the problem.
What sub-base do farm tracks and gateways need?
150mm to 250mm of compacted MOT, and more on soft or peaty ground where you are effectively building a raft rather than a surface. Lay and compact it in 50mm layers.
Ground conditions vary enormously across a farm, so the depth that works at the yard may not be right at the far end of the holding.
What size stone should I fill farm grids with?
A graded blend between 6mm and 20mm, angular and washed. A blend packs tighter than a single size because the smaller stone fills the gaps between the larger.
Avoid fines and scalpings: they bind the surface and stop it draining, which on a gateway defeats the point entirely, because a surface that holds water will be a mud hole again.
Can grids be lifted and reused elsewhere?
Individual grids can be lifted and reinstated, which is useful for temporary or seasonal access, or where a gateway may move.
Bear in mind the sub-base and excavation stay behind, so the reusable element is the grid itself rather than the whole build-up.
How much maintenance does a reinforced gateway need?
Very little. Check levels after the first winter and brush any settled cells back up.
Because the stone is confined there is no annual load of hardcore and no regrading, which is the normal maintenance cycle for an unreinforced entrance. The grid carries a 25 year warranty subject to documented installation.
Ask our engineer
Questions about depths, sub-base, edging or which system fits your project? Ask below.
