The assembly of the tower crane on the site depending on many conditions as structure of tower crane, implementing technology, the condition of geology, planning and so on. That is why the selection and assembly of tower crane in some cases aren't compatible with the designers' demands on some aspects such as distance between the crane with the site, the diagram of tie elements arrangement and insufficiency of manufacturing relative data. The paper presents some diagrams of tie-collar system arrangement that we often use on the tower crane, analyse for definition loads and combination loads that forces on system when we calculate it. The result of research had been tested.