The responsibility of the construction supervisor is huge. Quality of work mostly depends on the performance of the site supervisor. So, his role is very important for the quality of a project. A supervisor must have enough technical knowledge about construction for ensuring the quality of construction.
1- Concrete Cover for Reinforcement:
We generally call it clear cover or concrete cover. The clear cover is the distance between the rebar surface and the nearest outer surface of the concrete member. Concrete cover can vary depending on the size and location of RCC members.
The value of concrete cover for various RCC members are given below:
1- Pile – 3″ or 75 mm
2- Pile cap – 3″ or 75 mm
3- Footing – 3″ or 75 mm
4- Column below ground – 2½″ or 65 mm
5- Column above ground – 1½″ or 40 mm
6- Shear wall below ground – 2½″ or 65 mm
7- Shear wall above ground – 1½″ or 40 mm
8- Beam below ground – 2½″ or 65 mm
9- Beam above ground – 1½″ or 40 mm
10- Slab below ground – 2″ or 50 mm
11- Slab above ground – ¾″ or 20 mm
12- Stair – ¾″ or 20 mm
13- Retaining wall’s earth face – 1½″ or 40 mm and opposite face: 1″ or 25 mm
14- Door-window lintel – ¾″ or 20 mm
15- Sunshade – ¾″ (20 mm).
2- Hook’s Length of Stirrup:
The formula for calculating the stirrup’s hook length is 6*D. Where “D” is the diameter of the bar. But stirrup’s hook length should not be less than 3″ or 7.62 cm.
3- End Hook for Longitudinal Bar of Beam:
End hook is provided at both ends of the longitudinal bar. The length of the hook should not be less than 12 *D. Where D is the diameter of the bar.
4- End Hook of Slab Top Reinforcement:
The end hook length of the slab’s top bar shouldn’t be less than 12 * D
Where D is the diameter of the bar.
5- Bend for Vertical Bar of Column:
The vertical bar of the column is also called the longitudinal bar. Bend is provided at one end of the longitudinal bar. The bend is 90° and the length of the bend should not be less than 18″ (450 mm).
6- Anchorage Length of Cantilever Member:
The anchorage length of the main bar of a cantilever RCC member should not be less than 69 * D
Where D is the diameter of the bar.
7- Hook’s Angle of Stirrup:
The stirrup’s hook angle is 135°.
8- End Hook’s Angle of Longitudinal Bar:
The end hook angle of longitudinal bars of column and beam is 90°.
9- No Lap Bar:
Lap should not provide larger than 36mm dia of steel
10- Lap in compression zone: Steel should be lapping for compression zone with 50d where ( d ) is dia of steel bar
11- Lapping for Tension:
Steel should be lapping for tension zone with 40d where ( d ) is dia of steel bar
12- Maximum Lap in a Zone:
Don’t use more than 50% lapping zone in any RCC structure.
13- Bent Up bar:
Provide bent up bar near at support of slab and beam.
14- Placing 1st Stirrup:
1st stirrup of the beam should be placed within 2″ from the support.
15- Minimum Longitudinal Bar in a Column:
A square-shape column should have a minimum 4 number of bars and a round column should have a minimum 6 number of bars.
16- Chair:
MS bar for chair shouldn’t be less than 12 mm diameter.
17- Unit Weight of MS Bar:
1- 8 mm ø bar – 0.12 kg/ft
2- 10 mm ø bar – 0.19 kg/ft
3- 12 mm ø bar – 0.27 kg/ft
4- 16 mm ø bar – 0.48 kg/ft
5- 20 mm ø bar – 0.75 kg/ft
6- 25 mm ø bar – 1.25 kg/rft
18- Standard Length of MS Bar:
The full length of a deformed MS bar is about 40′.
19- Required Binding Wire:
For binding one ton of MS bar, 7 kg to 13 kg binding wire is required.
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