For a structural engineer and erection crew concrete detailing and drawings play important role in the overall success of the building or structural project. Concrete detail drawings must present the physical dimensions of a concrete structure and should incorporate well-defined construction sequence stipulated by the designer. It is essential that adequate information is shown to facilitate easy calculation of concrete quantities required to build and erect the framework.
For example construction joints, cast-in metal job, formed holes and important layers of bulk concrete must be shown. The Positions of cast-in metal work and formed holes must be adequately dimensioned to allow their accurate positioning inside the structural formwork.
The standard fillets and chamfers should not be detailed and shown on minor scale sections and views. In most cases the top surface of abutment headstocks and sill beams should be detailed to achieve a downward slop of around 3% from the front face to the curtain wall.
Plan views are useful in illustrating the location of some elements like headstocks, columns, footings, etc. They may also be used to show modifications, co-ordinates and some reference markings. Plan views must be drawn as a horizontal view kept directly above the element under consideration.
Elevations must be drawn as a view seen from a perpendicular plane directly in front of the element under consideration and shall be estimated from the elements plan view.
Sections must be drawn as a view from a cutting plane placed through an element formerly drawn as a plan or elevation. Typically, only the details at the cutting plane of the section shall be shown, but details beyond the cutting plane may be incorporated provided that the used details are not perplexing to the basic details being shown.
Construction joints are not allowed in pre-stressed concrete pieces unless otherwise specified by the designer. If required, such construction joints should be detailed on the concrete drawings. At the same time, the aesthetic aspect of construction joints must also be considered as and when required by the architect.
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