A secondary crane is used to attach the jib before the hydraulic mechanism is activated. this crane is used for very high buildings and also the complex building sites that is hard for cranes to reach and install the tower crane section by section. Unlike the tower crane, this crane here doesn’t reach its high limit at one time before the construction, But it grows itself up as the building do
Self erecting crane take the shape of T letter after being finished. For the success of installing process, it should be controlled by professional workers. This type of cranes is the modern version of tower crane and also has a high cost and certain safety precautions. These precautions like making sure that the crane base is away from electric cables, water leaking, unstable soil, excavation areas and to be near enough from the building to be attached to it later. And other safety precautions
