Centring of the column is done during the placing of layout on-site with the help of rope and plumb Bob.
For the construction of column following are the steps performed,
- Column layout
- Reinforcement of column
- Column formwork
- Concrete pouring
Centring of the column is done with the help of plumb bob and rope. Plumb Bob placed vertically from the top of rope point and it touches to the ground. Mark the point where plumbob touch the ground and done the PCC work.
What checking the vertical alignment, old a plumb bob at the top at any one edge of the column and inspect the plumb Bob is vertically straight and just touch the bottom offset of the column. If plumb Bob is inclined at some angle, then check its inclination where it shows the column is not vertical and inclined by some angle.