Graders Machines
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Graders Machines

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Graders Machines Graders Machines Presentation Transcript

  • Mansoor Azam Qureshi NUST Islamabad
  • Grader  Graders are multipurpose machines used for finishing and shaping. This is a long tractor driven piece of equipment with a blade mounted underneath 21 January 2014 Mansoor Azam Qureshi 2
  • 21 January 2014 Mansoor Azam Qureshi 3 View slide
  • Functions  Graders are used for  Grading  Shaping  They are also used for  Bank sloping         Ditching 21 January 2014 Mansoor Azam Qureshi Mixing Spreading Side casting Leveling Crowning General construction Road and runway maintenance 4 View slide
  • 21 January 2014 Mansoor Azam Qureshi 5
  • Graders Vs Dozers  A grader can make a shallow cut in medium to hard materials where dozer can perform heavy works.  Location and structural strength of grader blade does allow for heavy work.  Graders are capable of progressively cutting ditches upto 3 ft.  Graders can cut slope of 3:1 which can be done by a dozer. 21 January 2014 Mansoor Azam Qureshi 6
  • Graders- Equipment  Std Equipment is Moldboard or Blade.  Mounted on rotating circle.  It can be placed into many positions, either under the grader or to the side or it can be side-shifted horizontally for increased reach outside of the tires.  Aux equipments are:  Scarifier is placed between front wheel and blade  Rippers are placed at rear of grader  Laser blade control 21 January 2014 Mansoor Azam Qureshi 7
  • 21 January 2014 Mansoor Azam Qureshi 8
  • Blade Operation  Can be angled (positioned) at almost any angle to the line of‘ travel, parallel to the direction of travel, shifted to either side, or raised into vertical position.  The top of the blade can be pitched (leaned) forward or backward. 21 January 2014 Mansoor Azam Qureshi 9
  • Estimating Production  No of Passes(P)  Distance traveled in each Proper gear ranges for grader operations pass(D)  Efficiency of grader(E)  Grader speed(S)  Effective blade width(W) 21 January 2014 Mansoor Azam Qureshi 10
  • Example Maintenance of 5 miles of haul road requires cleaning the ditches, and leveling and reshaping the roadway. Use an efficiency factor of 0.60. Cleaning the ditches requires two passes in first gear (2.3 mph); leveling the road requires two passes in second gear (3.7 mph); and final shaping of the road requires three passes in fourth gear (9.7 mph). 21 January 2014 Mansoor Azam Qureshi 11
  • Example A haul road of 1,500 ft requires leveling and reshaping. Use an efficiency factor of 0.60. The work requires two passes in second gear (3.7 mph) and three passes in third gear (5.9 mph). 21 January 2014 Mansoor Azam Qureshi 12
  • Example  It is required to fine grade the subgrade of a roadway before proceeding to construct the subbase. Use an efficiency factor of 0.60. The grader will be operated in second gear· (3.5 mph) for this work. The effective blade width per pass is 9 ft. Estimate the production rate for these conditions. Note: Typically, multiple passes are required to meet the specified grade tolerance, which can accordingly reduce production. 21 January 2014 Mansoor Azam Qureshi 13
  •  A grader has a large blade used to create a flat surface.  Typical models have three axles, 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.  The grader's purpose is to "finish grade" (refine, set precisely) the "rough grading" performed by heavier vehicles such as bulldozers.  Graders can produce inclined surfaces and cambered cross-sections for roads 21 January 2014 Mansoor Azam Qureshi 14