Franki stake
The Frankipfahl is of reinforced in situ concrete existing foundation element with pile base of beaten-situ concrete. The stake is named after its inventor, Edgard Frankignoul .
commitment
The pile can be used in a wide range of subsoil conditions as a deep foundation element for structures of all kinds, such as B. transport structures, industrial buildings, dock floors, crane runways, wind turbines and much more can be used. It offers particular advantages where high loads are to be carried or the building ground with good load-bearing capacity is only available at great depths. The pile system has a large number of design variants, so that it can be individually adapted to the most varied of ground conditions and construction site situations.
Both plumbing piles and angled piles can be inclined up to 4: 1; for this purpose, the post is also suitable for absorbing tensile loads due to its widened base.
production method
It is an in-situ concrete driven pile with recovered jacking pipe. This is sealed watertight at the bottom with a plug made of dry concrete or gravel sand. A generator operating in the pipe Freifallbär proposes grafting on these rams and thus the tube as long as in the floor to sound building is achieved. The piling work performed (number of blows / m) is a measure of the load-bearing capacity of the soil at the respective pile location. After reaching the target depth or the ramming criteria, the plug is loosened and the required amount of concrete underfloor is tamped out. Then a reinforcement cage made of reinforcing steel is set, concrete is poured in and the driving pipe is pulled out again.
If the existing soil does not have sufficient load-bearing capacity at the intended setting depth, soil improvement using gravel precompaction can be carried out before the pile base is produced. Here, the soil is improved in a corresponding area below and above the pile placement depth by ramming out gravel. Usual working loads per pile are 1500–3500 kN, depending on the pile diameter and soil. Usual pile shaft diameters are 42–61 cm. The dimensioning and manufacture are carried out in accordance with DIN 1054 and DIN EN 12699.
Environmental sustainability
The inside ramming reduces emissions. With suitable boundary conditions, foundations with this pile system are also possible in the vicinity of existing structures. Due to the full displacement of the soil, there is no need to convey soil material, so loosening in the soil is excluded. The pile system is also suitable for construction projects in contaminated locations.
swell
- Foundation paperback . 4th edition, Verlag Ernst & Sohn
- Manual of civil engineering. Werner Verlag
- Recommendation of the "Piles" working group. 1st edition, German Society for Geotechnics eV ( DGGT ), Verlag Ernst & Sohn 2007, ISBN 978-3-433-01870-5 .