Concrete screw piles - Vroom Foundation Technology
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Concrete screw piles

Concrete screw piles, used in a technique known as continuous flight augering, were developed for use in projects on sandy ground and are also suitable for use in other specific ground conditions. They are non-displacing and can be installed very quickly. Installation is both low-noise and low-vibration.

This ground-removing foundation technology is used in residential construction and the construction of public utilities where specific ground conditions demand low-noise, low-vibration piles.

Concrete screw piles are produced in lengths of up to 26 m and, where required, we can take specific needs into account.

Features of CFA piles

  • Quick completion times available.
  • Adjustments to pile specifications can be made up to shortly before the start of the project.
  • The piles may be subjected to both compression and tensile forces.
  • Piles can be finished immediately to the required working level under certain circumstances.
  • The pile system does not displace ground/soil.
  • Concrete screw piles can be reinforced across the entire length. A section of rebar is used with longer pile lengths.
  • The pile system is well-known and recognised by the Netherlands Building Control Committee and designers alike.
  • Installation is both low-noise and vibration-free.

Areas of application

  • Primarily suited to a built-up environment where low-vibration and/or low-noise foundations need to be laid. 
  • Particularly good in areas with sandy ground in the substrate. Due to the short length of reinforcement required and speed of installation, a cost-effective type of pile. 
  • Can be used as sheet piling by screwing the piles in next to each other, which creates a vibration-free wall that can resist the pressure of adjacent earth.
  • They make a good alternative where the substrate is tough, where 'traditional’ methods of pile driving may lead to pile breakage.

Quality control

Vroom Funderingstechnieken (Vroom Foundation Technology) produces concrete screw piles using a proprietary process devised as part of internal quality control and in line with nationally-applicable standards.

CFA piles made by Vroom Funderingstechnieken may, optionally, be acoustically audited and assessed by an independent firm of engineering consultants. Our own quality-control procedure allows us to respond properly to any doubts on the quality of the piles, or to customer requirements relating to implementation.

Concrete for CFA piles is obtained from certified concrete mixing plants.

Allow us to advise you

We at Vroom Funderingstechnieken prepare our leaflets and website with the greatest possible care and attention. However, no rights can be derived from such content. If you use information from our leaflets or our website without verification or further advice, this is at your own risk.

Vroom Funderingstechnieken accepts no liability for the correctness and/or suitability of the information for the purpose you envisage. Should you have any questions about the use of our products for actual projects we advise you to contact our sales department.

Technical specifications Concrete screw piles

Pile length

We have several hydraulically-driven units which can be used to make concrete screw piles of up to approx. 26 m. We use modified machines to make piles of greater lengths.

Rotary head drilling systems

Our hydraulic rotary heads are fitted with hydraulic drill attachments. Vroom has drilling motors for concrete screw piles with a capacity of up to 25 ton metres.

Concrete grade

Available in grades C20/25, C25/30 and C30/37.

Reinforcement

B500B grade. Dimensioning of longitudinal reinforcement is based on information supplied by the designer. The reinforcement may take the form of brackets or a coil/spiral.

Bearing capacity

The bearing capacity in terms of soil mechanics as per Eurocode 7 (NEN 6743) gives the following parameters:

Pile base coefficient

αp = 0.8 (section III – reduced) 

β = 1.0 for standard tube/foot dimensions

Shaft friction coefficient

αs = 0.006.

Tension αt = 0.0045.

Load and deformation behaviour

As per Eurocode 7 (NEN 6743, part 2) 

Load spectrum

Up to a maximum of 5000 kN (calculation value).

Structural aspects

Available CFA pile diameters, dimensions in mm:
300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 1000.

The shaft dimensions are fixed measurements.
Other pile diameters are available on request.

Process

Production process CFA piles 

  1. The screw auger is driven in with the hydraulic drill attachment.
  2. The hydraulic rotary head turns clockwise to the correct depth.
  3. The core of the tube is filled with wet concrete until the right pressure is achieved.
  4. The wet concrete in the core is continually kept under pressure while the tube is withdrawn either still or with a slight clockwise rotation.
  5. Rebar is inserted.

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Can we help you with your project?

Contact Paul Bochem. Dial +31(0)299 409 541 or send us an e-mail.

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