Estimating Sheets

 

Some important tips for Civil Site Engineering

 

 

Engineers are always looking for excellence in construction. But they have to follow some basics before starting the mega project.

 

The site engineers generally concentrate much on those issues:

 

  • Bars which have the diameter more than 36 mm should avoid lapping.
  • The maximum chair spacing is 1.00 m (or) 1 No per 1m2.
  • Minimum 12 mm diameter needed for dowel rod.
  • 12 mm diameter bar should be used in chair.
  • The longitudinal reinforcement should follow the range between 0.8 6 per cent of gross CS.
  • For circular column, bars would be 4 Nos and 6 Nos.
  • Slabs are important in any construction. The main bar slab (8 mm HYSD) or 10mm (plane bar), distributor should not be less than 8 mm and more than 1/8th of slabs thickness.
  • 125 mm is minimum slab thickness.

 

 
  • Concrete free fall maximum maximum 1.50 m.
  • Remember lap slice should not be used in the bar larger than 36 mm.
  • Brick water absorption should not be 15 per cent.
  • PH value of water has to be 6.
  • Brick compressive strength 3.5 N / mm2.
  • 8 kg per MT is the measurement of steel reinforcement binding wire.
  • Samples for ore cutting test in the soils filling for every 100m2.

 

Density of Materials:

Bricks: 1600 1920 kg/m3
Concrete block: 1920 kg/ m3
Reinforced concrete: 2310 2700 kg/ m3

 

Cube samples required for different quantity of concrete:

 

Quantity of Concrete

No. of cubes required

1 5 m3

1 Nos

6 0 15 m3

2 Nos

16 30 m3

3 Nos

31 50 m3

4 Nos

Above 50 m3

4 + 1 Nos of addition of each 50 m3

 

Curing time of RCC Members for different types of cement - Super Sulphate cement: 7 days, Ordinary Portland cement OPC: 10 days and Minerals & Admixture added cement: 14 days.

 

Some important tips for Civil Site Engineering

 

De-Shuttering time of different RCC Members:

RCC Member

De-shuttering time

For columns, walls, vertical form works

16-24 hrs.

Soffit formwork to slabs

3 days (props to be refixed after removal)

Soffit to beams props

7 days (props to refixed after removal)

Beams spanning upto 4.5m

7 days

Beams spanning over 4.5m

14 days

Arches spanning up to 6m

14 days

Arches spanning over 6m

21 days

Read More: theconstructor.org/tips

 



 

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