ERECTING A CONCRETE COLUMN

Erecting a Concrete Column

Concrete columns are used for carrying loads of a building. They transfer the same to a suitable soil bearing capacity. They carry loads horizontally, vertically and laterally. They can be erected as free standing, used for hanging gates. Alternatively they can be incorporated within the walls of a building structure. Concrete columns are made from steel and concrete cast in a form work. Columns can be circular, rectangular or square shapes.

In erecting concrete columns the load to be carried is considered. This determines the size of column and type of reinforcement to use. The process of erection commences by setting up a base. A pit is first excavated to a suitable soil bearing capacity in depth. Blinding to the pit is done to protect the soil touching the steel reinforcements. When the base is cast, some steel reinforcement is left exposed. This is used as starter bars for the column.

Form work of the required column size is formed first aside. The already tied steel is joined together with the starter bars. This ensures the column starts from the ground upwards. The steel should be free from oils and rust. Use binding wire to tie together all steel.. When the steel work is complete, then form work assembly starts.

The form work for erecting a column is fixed by opening the sides. It’s then slid to have the steel inside the box. When fixing the form work care must be taken to ensure that the steel reinforcement is not in contact with the casement. Allowance should be left between the steel and the form work casement to allow the concrete to cover the steel all round. Once the box is upright, the form work is then fastened and supported on all sides. Concrete is then poured and vibrated until it reaches the top of the box. It is important to cast concrete in lifts as you vibrate. This should not exceed two thousand five hundred millimeters in height. The form work casement is then left on for seven days as curing take place. Curing is done from the top. After seven days the form work is then removed to expose the cast column. This is continuously cured for another seven days.

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