Construction of concrete stairs includes steps such as designing, preparing foundation, building formwork, placement of reinforcement steel bars, concreting, finishing and curing. Construction of concrete stairs is a difficult task that requires an engineer to study all the aspects and design it and a skilled labour to construct it.
In this article we explain you the detailed method of how to construct a concrete stairs from start to end.
Steps for Construction of Concrete Stairs
The followings are the steps involved in construction of concrete stairs,
1. Designing of Concrete Stairs
Designing of stairs requires through knowledge about design aspects and site study. The factors that influence the design of stairs are height of the floor, width of the stairs, risers depth, thread width, thickness of the stairs, angle of the stairs, load applied on the stairs and many other aspects which requires a qualified engineer to design the perfect stairs.
The standard dimensions for stairs components are,
|Thread||9 – 9.25 Inch|
|Riser||7.5 – 8.25 Inch|
|Flight Angle||30 – 45 Degree|
2. Foundation and Support for Concrete Stairs
The foundation on which the concrete stairs rest is to be properly constructed so that the loads of the stairs are transferred in to ground successfully and to resist the movement of stairs.
If the plinth beam of building is present at the start of the stairs, then the reinforcement steels bars can be connected to them which will transfer the loads. If no plinth beam is found, then a small concrete foundation or size stone masonry is constructed.
To support the stairs at the top which restricts the movement of stairs is usually done to the roof beam or slab.
3. Building the Form-work for Concrete Stairs
The most important step when building concrete stairs is to use a proper formwork. The angle of flight, dimensions of thread and riser are to be properly checked. Usually while constructing a stairs attached to wall, the line of flight , thread and risers are marked on the wall for proper fixing of shuttering or formwork.
The boards must be at least 2” thick, as to support the weight of the concrete. The whole structure of the form, must be supported by 4×4 posts. The wooden boards are used to create the steps and are fastened with several screws to the lateral structure of the formwork.