Under the name of construction machinery are included a group of machines used in construction activities with the purpose of Remove part of the soil layer in order to modify the soil profile according to the requirements of the specific engineering project. Transport materials (aggregates, water, concrete, elements to be incorporated in the construction Loading and unloading building materials Shape the ground Excavation machines are used to remove the ground where the foundations and bases of buildings , towers and bridges will be laid . Also to displace soils and shape the land in the realization of roads, to excavate tunnels, to assemble dams and mining works. Depending on the characteristics of the soil is the type of machinery that is most appropriate. For example, very hard soils such as rocks or cemented sands require hammers to drill rock, circular cutting blades or backhoe loaders with mincing hammer. On the other hand softer floors allow to work with backhoe loaders and motor graders