Full displacement piles

We offer full displacement bored piles (FDP), also known as helical piles, as Atlas or Fundex piles. These pile systems can be manufactured quietly and are therefore often used in inner-city areas to minimise construction noise for residents. Due to the vibration-free implementation, these pile systems are also well suited for use directly next to vulnerable structures.

The soil is fully displaced, resulting in optimised subsoil conditions and zero drilling waste. This saves transport and disposal costs.

We use full displacement bored piles as deep foundation elements for all types of structures. These include:

• Residential and commercial buildings
• Offices and hotels
• Industrial buildings
• Bridges
• Next to vulnerable structures
   

The short set-up times, fast pile production and comparatively high load-bearing capacity associated with helical piles increase cost efficiency and shorten construction times. The installation procedure and the control of the required resistances allow the pile lengths to be readily adapted to changing soil strata.

• Vibration-free and low-noise production: helical piles are therefore particularly suitable for foundations in densely populated areas and in the vicinity of neighbouring buildings that are sensitive to vibration.
• Helical piles can absorb high tensile and compressive loads.
• Characteristic pile resistances R_k up to 4,000kN.
• High pile skin friction with the Atlas pile.
• Comparatively high pile tip resistance for the Fundex pile.
• Full soil displacement: Improves the subsoil and does not produce any drilling waste. This saves on additional costs for transport and landfill disposal.
• Can also be used in contaminated soils.
• Very good resistance-settlement properties.
• Can be produced under restricted working heights.
• Plumb and raking piles can be installed at an inclination of up to 4:1.
• Can be implemented as an energy pile so helical piles can also be used for geothermal energy.
   

Standards and regulations

Our displacement piles in accordance with DIN EN 12 699 include:

• Driven precast piles (steel pipe piles)
• In-situ concrete driven piles (Frankipfahl piles, Simplex piles)
• Helical piles (Atlas piles, Fundex piles)
• Grouted displacement piles (ductile piles, HPD piles)
   

Helical piles are designed and manufactured in accordance with Eurocode 7 and DIN EN 12 699 and the recommendations of the “Piles” working group (EA-Pfähle). Diameters can range from 38/45cm to 51/61cm (inside/outside). Pile lengths of up to 30m are possible. 

Production

The following types of foundations are possible:

• Single pile foundations with one-dimensional load transfer
• Group pile foundations with two-dimensional load transfer
• Special case: combined pile raft foundations
   

The wide variety of available variants allows us to adapt to the most diverse subsoil conditions and construction site scenarios in order to achieve high load-bearing capacities.

Quality assurance in construction work requires compliance with  European and national standards and the recommendations of the “Piles” working group (EA-Pfähle). Self-monitoring and documentation of construction are regulated in the manufacturing standards.

A procedure instruction that is individually adapted to the requirements of the relevant project is required to install helical  piles. The machine operator’s instincts are just as important as his technical knowledge or experience. Operating the large special equipment is a delicate process that requires optimal tuning of the manufacturing parameters to achieve the desired pile resistance.

We ensure high execution quality with:

• Individually coordinated instructions
• Compliance with the requirements of DIN EN 12 699, Eurocode 7 and EA-Pfähle
• Clear processes via our quality management system in accordance with DIN EN 9001:2015
• Static or dynamic pile load testing
• Pile integrity tests
   

We always work with our own special equipment and appropriately qualified professionals. Our strength: We can adapt to the individual conditions on the construction sites at any time during the project. Our long-standing experience and a wide range of technical possibilities ensure that implementation is always safe and successful.

Atlas piles

A steel pipe with a replaceable cutter head attached at the bottom is pushed into the ground in a rotating motion. The cutter head displaces and compacts the soil to either side. The cutter head is sealed watertight with a lost tip.

The cutter head and the pipe are screwed into the ground without vibration by means of a rotary drive and simultaneous contact pressure. The applied torque is measured during driving and compared with the subsoil data, e.g. drilling profiles and probing diagrams. Once the required pile bond has been achieved, the driving process is completed, and the reinforcement cage is inserted. The pipe and the storage tank are filled with concrete.

The pipe and the cutter head are rotated back out again. In the process, the tip comes off, and the cutter head forms the thread-like pile. Due to its high static pressure, the concrete column in the pipe and the tank immediately fills the vacated cavity with concrete. This creates a helical concrete ridge around the pile shaft in the ground, approximately 5cm thick. The tip remains in the ground and becomes the pile foot. Atlas piles can be manufactured plumb or at an inclination of up to 4:1. The key data recorded during pile manufacture are documented in a pile log in accordance with DIN EN 12 699.

Fundex piles

A thick-walled steel pipe, sealed watertight by a helical tip, is pushed into the ground in a rotating motion. The tip displaces the soil to either side and compacts the ground around the pile.

The applied torque is measured during insertion and compared with drilling profiles and probing diagrams. Once the target depth is reached, the reinforcement cage is inserted. The pipe is filled with concrete.

The pipe is pulled out by rotating it to the left and to the right, which discharges the concrete from the bottom of the pipe. This creates the smooth shaft of the Fundex pile. The tip remains in the ground and becomes the pile foot. Fundex piles can be manufactured plumb or at an inclination of up to 4:1. The key data recorded during pile manufacture are documented in a pile log in accordance with DIN EN 12 699.