El encofrado permanente para suelos arcillosos

En los problemas de cimentación en suelos arcillosos, rara vez se dan en el ámbito del proyecto condiciones que faciliten un enfoque «proactivo» con respecto al suelo.

En la mayoría de los casos, se diseña la estructura y luego se prevé su comportamiento en función de las características mecánicas del suelo, mientras que sólo en contadas ocasiones es posible actuar sobre ellas para modificar las condiciones ambientales desfavorables.

Daliform Group creó Coffrargile, un encofrado permanente de plástico reciclado, para hacer frente eficazmente a los movimientos de los suelos arcillosos y proteger los forjados de la retracción/inflamación.

Coffrargile se utiliza en combinación con Beton Up, un accesorio que evita que el hormigón forme los típicos «pilares» del sistema clásico Iglù®.

De este modo, el encofrado adquiere la función de una simple cubierta sobre la que se puede crear una losa portante de hormigón armado con una cavidad debajo, cuya finalidad es acomodar el hinchamiento y la retracción de la cimentación debido a las características mecánicas particulares de los suelos arcillosos.

REFERENCES

Ventilated foundations on a residential building with clay soil treatment

Rueil-Malmaison - France
Coffrargile

ADVANTAGES

  • Impervious to the weather; compared to the alternative system which is composed of disposable formwork made of biodegradable cardboard and for which outdoor storage on building sites is unsuitable due to the risk of humidity, fog or precipitation, the Coffrargile system is impervious to the weather.
  • Ease of storage and handling on site.
  • Resistant to termites, insects, rodents and other animals, which, can in contrast, destroy cardboard elements.
  • Ecological and environmentally compliant. Compared to the alternative system of formwork made of cardboard, Coffrargile leaves no compostable organic residue that can give rise to offensive odours and provide nesting material for various animals.
  • Greater solidity during the setting of the load-bearing reinforced concrete slab.
  • Does not transmit stresses to the structures that it supports. Coffrargile provides a void, whose height depends on the thickness of the product, under the load-bearing slab in order to adapt to any problems with the soil, regardless of the amount of swelling anticipated.
  • Easy installation due to the lightness and simplicity of interlocking elements.
  • Supports the weight/passage of workers on site, avoiding the risk of accidents and injuries.
Cassero a perdere per contrastare il ritiro/rigonfiamento del terreno argilloso
Behavior in case of soil swelling, with the use of Coffrargile
Cassero a perdere per contrastare il ritiro/rigonfiamento del terreno argilloso
Behavior in case of soil shrinkage, with the use of Coffrargile

APPLICATIONS

Coffrargile is the effective solution for creating cast-in-place reinforced concrete slabs that do not suffer from the effects of swelling and shrinkage inherent in clayey soils for the construction of office and commercial buildings as well as civil and industrial projects which are threatened by underlying clayey sediments.

Commercial building
Industrial building
Residential building

TECHNICAL DATA

Working dimensions** cm 50 x 50 x 16* h
Height tunnel clearance h cm 11
Quantity of concrete to the crown*** m3/m2 0,034
Weight of each unit kg/pcs 1,536
Pallet dimensions cm 110 x 110 x 244 h
M2 pallet m2/PAL 75
Pallet units pcs/PAL 300
Pallet weight kg/PAL 474
Accessory: L-Plast Panel cm (HxLxD) 14x205x7

The material is waterproof and can therefore be stored outside.
* Other heights are available on request.
** Recyclable material is allowed a size tolerance of ± 1,5%.
*** The volume may vary depending on the pouring condition and the tolerance of the material.

INSTALLATION

Dry assembly method

1. Position the first element to the upper left with respect to the work surface, making sure that the arrow is pointing up.

2. Unite the elements in sequence, by horizontal row, proceeding from the left towards the right and from the top downwards (following the direction normally used for writing), as shown graphically on the crown of each unit.

Disposable formwork to effectively handle the movements of clayey soils and protect floors from shrinkage/swelling

Installation

Encofrado para proteger los suelos arcillosos de la contracción/hinchazón
Encofrado para proteger los suelos arcillosos de la contracción/hinchazón
Encofrado para proteger los suelos arcillosos de la contracción/hinchazón
Encofrado para proteger los suelos arcillosos de la contracción/hinchazón

1. Lay the interlocking male/female formworks directly on the dry ground, from left to right and top to bottom, ensuring that the arrow marked on the Coffrargile formwork is facing up.

2. Place the Beton Up element above each leg to plug the hole and prevent the concrete from forming legs.

3. Placement of the reinforcing rods is above the formwork and above the foundation beams, according to the project.

4. Casting of the reinforced concrete to form a load-bearing slab that is reinforced and supported with a cavity along the edges to accommodate the movements of the ground.

To ensure a correct installation and perfectly created under-floor cavity please refer to the product’s usage requirements.

ACCESSORIES

BETON UP

BETON UP – for monolithic slabs.
Beton Up
is an accessory of the Coffrargile system, which prevents the concrete from penetrating between one formwork and another and from forming legs. In this way, the formworks take on the function of simple scaffolding on which a monolithic reinforced concrete slab that is bound to the surroundings can be installed. It should be noted that, with Beton Up, the slab is not self-supporting.

The use of Beton Up is indispensable for creating an air cavity below the scaffolding and obtaining an optimal result with the aim of ensuring that the swelling and shrinkage typical of clayey soils do not stress the scaffolding and therefore do not lead to breakage of the slab.

L-PLAST PANNELLO FERMAGETTO

L-Plast is used for new constructions to create the slab and foundation beams with a single concrete casting; when restructuring is used to easily create reinforcement curbs for existing foundations. Furthermore, L-Plast is ideal for creating air ducts in general, such as for cold rooms, for example (if forced ventilation is necessary) or in geothermal applications where air must be blown into the under-floor cavity.

When restructuring, when the existing walls must be reinforced or when an underpinning must be created, L-Plast is a useful work tool that helps creating a new slab or reinforcement base with a single casting.

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