For example, marking foundation layout, excavations, base preparation including leveling and lean concrete placement, formwork and then steel placement, concrete pouring, and curing. Construction of concrete foundation is divided into number of work activities with specific objectives and completion time for each activity is defined. These activities are almost the same in almost all types of foundations but the sequence and method of execution might be different slightly.
Each activity for the construction of concrete foundations has to be planned, as it requires specific machinery at every stage. The construction plan for the foundation is affected by the ability of the contractor to accomplish the project and the resulting costs of the project . Each activity for the construction of a foundation requires different skill sets of workmen and different machinery. All the activities for a foundation construction must be properly sequenced and resources required at different times of the activity must be estimated.
For a construction large construction undertakings, there can be many numbers of foundations to be casted on a single day. The undertaking planner for foundation construction should determine the quantity of works involved in each activity and estimate the quantity of materials to be required. as a result, it is required to plan each and every activity of this construction.
The number of instruments and machinery, workforce and other resources to be used for this construction must be well planned in advance. The building of forms would normally be measured by the square meter of concrete surface area. For instance, the placement of concrete could involve the total number of cubic meters of concrete involved in the activity.
Marking of foundation layout at site . 1. Procedures for setting foundation layout can be obtained here .
2. Earth excavation up to the needed depth by means of machine. Excavation steps in combination with safety measures and suitable methods can be found here .
3. Earth excavation and levelling of soil by means of hand operated instruments.
5. Placement of reinforcement steel
6. Erection of concrete formworks for footings.
6. Placement of concrete and vibrating and levelling of concrete surface.
7. Removal of formwork after the concrete has set.
8. Curing of concrete for the needed number of days.
9. Applying finishing coats on concrete surface.
11. Backfilling of excavation up to the required depth in the number of layers.
Placement of Rebar in Footings – Horizontal and Vertical Rebars
How to Pour Concrete Foundation?
Guidelines for the Construction of Concrete Foundations
Tolerances for Concrete Foundation Construction as per ACI 117M-10
Methods of Excavation Used for Deep Foundation Construction
Tolerances of Errors in Pile Foundation building