WHAT IS GANTT CHART OR BAR CHART?

GANTT CHART OR BAR CHART

  • The gantt chart or bar chart was developed by henry gantt for planning and scheduling the methods of construction. It is a construction management technique. This chart is graphical representation of various activities involved in a construction work. It consists of two co-ordinates. 
  • The horizontal ordinate or bar represents the various activities involved in a construction work and the duration of times required for completion of the activities.
  • The vertical bar represents the respective activities to be performed. It is a sequence of various activities.
  • The length of each activity denotes the time consumption for each activity or job for its completion. The various activities are shown parallel to each other along ordinates.
  • The various activities are shown by a number of parallel ordinates or bar, therefor it is called a bar chart. The duration of activities are represented from the left to right. Each bar is a divided longitudinally into two portions. The top portion indicates the progress of completion of the activity and the bottom portion indicates the duration of the activity.
  • The various activities for the construction work may include site preparation, excavation, footing, retaining wall, plinth beam & slab, waterproofing plaster for retaining wall, back soil filling, column, masonry work, slab work, plastering work and so on.
  • The use of bar chart is very useful for those projects where a time limit for project is defined and it is more useful because of the following advantages.
(A) It is very simple to prepare and interpret.
(B) Each item of work or activity is shown separately.
(C) It is very easy to compare the progress and original schedule.
(D) It is easy to know the time for the resources of activities.
(E) The modifications to chart, If required, can be done easily.

                How to Build a Gantt Chart
The basic procedure is given below to build a Gantt chart.

1.Identify the steps or activities needed to complete the project.

2.Identify milestones within the project.

3.Identify the expected time required to complete each task.

4.Identify the sequence of tasks and the order of importance of tasks.

5.Draw a horizontal time axis on the bottom of a page and Select a proper time scale to represent the length of tasks.

6.Prepare a column on the left side of the paper and write down each activity and milestone of the project in their corresponding order of occurrence.

7.For activities or milestones that occur at a specific point in time, represent them using a diamond under the time the activity must happen.

8.Activities that occur over a determined period of time draw horizontal bars, or an empty rectangle starting from the first day the activity will take place and finishing the day the activity ends. Do not fill inside the rectangle.

9.Each activity or task must be listed in the Gantt chart.

10.Fill up the diamond or the rectangle as each activity is being performed.















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