Permanent formwork for counteracting the deformation of argillaceous foundation sediments

With foundation problems in clayey soils, conditions which facilitate a “proactive” approach with regard the soil rarely occur within the scope of the project.

In most cases, the structure is designed and its behaviour is then anticipated as a function of the mechanical characteristics of the soil, while only seldom is it possible to act on these in order to modify unfavourable environmental conditions.

Daliform Group created Coffrargile, a permanent formwork made of recycled plastic, to effectively handle the movements of clayey soils and protect floors from shrinkage/swelling.

Coffrargile is used in combination with Beton Up, an accessory that prevents the reinforced concrete from forming the “pillars” typical of the classic Iglu’® system.

In this way, the formworks take on the function of simple scaffolding on which a load-bearing slab of reinforced concrete can be installed with a cavity below, the purpose of which is to accommodate the swelling and shrinkage of the sediment underlying the foundation due to the special mechanical properties of clayey soils.

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

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

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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