RCC Column Construction Process
RCC columns are mainly constructed in four different stages, which are
- Column Layout Work.
- Column Reinforcement Work.
- Column Formwork and
- Pouring Concrete,
1. Column Layout Work
This is the first step of column construction. In this step, the location of columns is decided practically in the field. It is done by laying rope as per the grids are shown in the drawing and afterward, the location of columns are marked.
2. Column Reinforcement Work
When marking of column location is done, the reinforcement of columns are placed according to the structural drawing.
For example, C1-12#16 mmØ and stirrup-10 mmØ@4″c/c.
This means, the column C1 will have 12 numbers of 16 mm diameter bars as the vertical bar and 10 mm diameter steel should be placed 4 inch center to center spacing as the stirrup.
Lets look for another example, C2-8#20 mmØ +10#16 mmØ and stirrup – 10 mmØ @(4″+6″)c/c
So the column will have 8 numbers of 20 mm dia bar and 10 numbers of 16 mm dia bar for vertical reinforcement and (4″+6″) c/c means the middle half portion of clear height of column will have 6″ center to center spacing of stirrups and the upper one-fourth as well as bottom one-fourth height of the columns clear height will hold stirrups at 4″ center to center spacing.
3. Column Formwork
The floor height is normally kept at 10 feet. If the slab contains beam, then concrete has to be poured upto the beam bottom level. For example, if the beam height is given in the drawing is 1′-6″, the casting height of column and formwork will be 8′-6″.
But as we know that dropping concrete more than 5 feet height is not allowed because it will cause segregation, we should create formwork within 5 feet height. When the first part will be cast completely, the rest part should be started.
4. Pouring Concrete Into Column
Concrete pouring is the final step for column construction. It can be done in two different methods.
- Manually
- Using machine or pump.
