Construction

Demarcation/layout Procedure


The following procedure is recommended for demarcation of a building. 

  • For layout of a building baseline is marked on the ground either from centre line of the road or from any permanent building nearby. This line helps to mark out the front of a building. Side baseline is also marked with the help of side structure or road or it can be marked with the help of first baseline or boundary of the plot.
  • Fix temporary pegs at the centre line of walls/columns on both sides of walls and columns in front and back side.
  • Fix peg at the centre line of walls/columns on both sides of wall and columns in left and right side of front of building. 
  • Check diagonals of the square or rectangle formed after fixing pegs.
  • Construct Burji or marking pillars with pegs at a distance of 1.5 meter to 2 meters and their top surface should be plastered.
  • Mark centre line on the top of Burjis with the help of thread (Soot) or with the Thedolite in big projects and the diagonal and other dimension should be checked.
  • Level Burji on all corners of building and the top level is fixed at a proposed plinth level.
  • Mark the foundation of walls/columns according to drawing on the ground with the help of centerline marked on the Burji.
  • Mark foundation trenches on the ground with chalk powder.
  • Excavate the foundation of the walls /columns up to required level and the excavation must be checked with the help of centre line and level burji to avoid any complication later on.  

Demarcation procedure

 

Demarcation lines

 

Demarcation of foundation walls

Advantages of Layout with the help of Burjis

  • It saves time for measuring and setting of point again and again at the time of construction.
  • It increases the efficiency of mason and foreman for doing their jobs. 
  • Accuracy can be checked at any time at any step.
  • If any mistake is found, it can be easily be rectified at early stage. It is very difficult to rectify the mistake in later.
  • Cross check can be done by senior engineer in minimum time.
  • A qualitative work is maintained.

 

Disadvantages for doing the work without layout

At some sites of work the contractor brings steel pieces, erects the same on the ground and start the work of excavation. In due course these steel pieces are just discarded. Thus no proper reference point is available while doing further jobs.

  • It involves extra time for measuring the offset again and again.
  • Accuracy can not be checked at early stage and it will be very difficult to rectify the same in later stage.
  • It involves wastage of time and money while doing rectification. This also leads to bad quality of work.

Materials used during Setting up of Layout

  1. Leveling Instrument
  2. Balli
  3. Long Nails
  4. Hammer
  5. Right Angle(Guniya)
  6. Steel Tape
  7. Thin Cotton Thread
  8. Bricks
  9. Cement
  10. Screen Sand
  11. Lime Powder
  12. Theodolite
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