use heavy equipments in civil engineering

      Excavator 

• An excavator is a construction vehicle used to excavate or move large objects. 
• An Excavator is basically made up of  2 parts: a driving base associated a powerful boom arm with an attachment designed for excavating.
•  The o-operator sits within a small cab connected to the base and controls the arm.The excavator uses a Hydraulic system to generate a Hydraulic force to control the mechanical arm of the machine.
• It also uses a chain wheel system for it’s movement. Excavators are been used in large and small scale constructions.
•  They are used for small housing projects to do a cut and fill, used in road construction, used in marine structures to place armors and large rocks,   and also been used in larger sites to excavate, move construction material, remove construction waste etc….. 
• There are several types of excavators which are classified on use, brand and purpose.

                2.use Of steer loaders in construction 

• A skid loader or skid-steer loader is a small rigid frame, engine-powered machine with lift arms used to attach a wide variety of labor-saving tools or attachment.     

                 3.use of grader in construction

•    a grader mostly use in before road construction.
• A grader, also commonly referred to as a road grader or a motor grader, is a construction machine  with a long blade used to create a flat surface during the grading process. 
• Typical models have three axle, with the engine and cab situated above the rear axles at one end of the vehicle and a third axle at the front end of the vehicle, with the blade in between. In certain countries, for example in  Finland , almost every grader is equipped with a second blade that is placed in front of the front axle.
•  Some construction personnel refer to the entire machine as "the blade". Capacities range from a blade width of 2.50 to 7.30 m and engines from 93–373 kw(125–500 HP). Certain graders can operate multiple attachments, or be used for separate tasks like underground mining.

               4.use trucks in civil engineering 

• Haul trucks are used in large surface mines and quarries. 
•  They have a rigid frame and conventional steering with drive at the rear wheel. As of late 2013, the largest ever production haul truck is the 450 metric tones.