The existing Srebrnjak Children's Hospital in Zagreb is going to be expanded a with a building on its eastern side. Due to the hilly character of the topography of the terrain and the average slope of ~26°, the underground part of the newly planned building will be located in a cut that will be more than 12 m deep. Therefore, it is necessary to protect the existing building and the excavation, i.e. the construction pit, as well as to ensure the stability of the slope. Construction pits are excavations in the ground that facilitate construction activities such as foundation work, work on underground installations, construction of basements, etc. They can be shallow or deep and they can pose significant risks to workers, surrounding buildings and the environment if they are not properly supported and protected. Using piles is one of effective methods of protecting construction pits.. Piles are placed around the perimeter of a construction pit to provide lateral support and to prevent soil or slope collapse.. Piles are structural elements used to transfer loads from a structure to the ground. They are usually used in geotechnical engineering for deep foundations, i.e. supporting buildings, bridges and other structures that are built on soft, weak or collapsible soil. There are several types of piles, and the choice of type depends on factors such as soil conditions (strength, stiffness, compressibility), required load capacity, and structural limitations.