In the production of full displacement bored piles, the drilling tool is driven into the ground without any relevant soil extraction and without causing any vibrations. The pile is then concreted while the tool is simultaneously pulled out. This manufacturing process completely displaces and simultaneously compacts the soil in the vicinity of the pile shaft. This leads to an increase in load-bearing capacity compared to conventional bored piles. In Germany, two full displacement bored pile systems are predominantly marketed, the "Fundex" and "Atlas" types. However, there are a large number of other full displacement bored pile systems that differ greatly from one another in terms of their manufacturing process, the design of the drilling tool and the load-bearing capacity. The aim of the research project is to optimize the system of full displacement bored piles with regard to a more economical and sustainable design. Two aspects are decisive here. On the one hand, a deeper understanding of the soil mechanical processes during the production of screw piles is to be gained. In this context, the influence of the manufacturing process on the load-bearing behaviour is to be investigated and the optimization potential of different pile systems is to be worked out. The existing pile systems are to be further developed in the scaled physical and numerical model. The aim is to increase the load-bearing capacity by modifying the drilling and cutting tool. It is important that the installation capability of the pile is retained. The further developed drilling tool will then be tested in field trials. On the other hand, the planned research project should help to quantify the increase in load-bearing capacity and implement it in the design. To this end, it is necessary to derive the relative improvement in load-bearing capacity in relation to the known initial system ("Fundex" or "Atlas" system) for various system boundary conditions. The results are then to be transferred into a standardized process that can be used for different full displacement bored pile systems.