Cased CFA piles

Application

Tubular bored screw piles are used as pile foundation or pile wall in locations where vibrations and specially soil settlement should be avoided.

Because the piles are produced inside a casing, the risk of soil relaxation is virtually non-existent, which gives the piles a higher load-bearing capacity than traditional bored screw piles. This makes it possible to produce piles or pile walls close to adjacent structures and foundations. The casing ensures that no soil can enter from below the adjacent structures, which means that there is only a slight risk of settlement damage as a result of the manufacturing process. The pile can also be used as a tensile pile by fitting it with a central rod or steel section along the entire length. Piles used for pile walls are fitted with reinforcement along their entire length, giving this type of wall great stiffness and strength. Because the pressure from liquid mortar exceeds the horizontal soil pressure, the bored pile wall is very stable, allowing its use next to heavily loaded structures. The large strength and stiffness of the concrete pile walls mean it can also be used in deep construction pits with slight deformations. The casing can be left behind in quay walls and loading/unloading jetties, thus creating a foundation in the wet.

Ambient factors

• Vibration-free and low-noise.
• Can be installed relatively close to adjacent structures.
• No pile storage needed 

Pros and Cons

• The system produces little noise and vibrations and is capable of absorbing tensile as well as compressive loads. By drilling the piles next to each other or in an overlapping design, construction pit walls with great stiffness and slight risk of damage can be produced.
• The strength/stiffness ratio is superior to that of, for instance, steel sheet piling.
• The piles have a large penetration capacity and can be used in hard soil layers. 

Applicated