VP Construction Interview Questions and Answers

Lap length is the amount of overlap between two reinforcing bars in a concrete structure.

• It is necessary to provide lap length to ensure the transfer of stresses from one bar to another.

• The lap length depends on the diameter of the bars, the grade of steel, and the type of structure.

• For example, in a beam, the lap length is usually 50 times the diameter of the bar.

• In columns, the lap length is usually 40 times the diam...read more

Cover blocks are used to maintain the distance between the reinforcement steel and the formwork in RCC work.

• Cover blocks come in different sizes depending on the thickness of the concrete cover required.

• For example, for a 20mm cover, a 20mm cover block is used.

• For a 25mm cover, a 25mm cover block is used.

• The size of the cover block should be such that it can withstand the weight of the reinforcement steel and the concr...read more

There are 5 types of scaffolding commonly used in construction.

• The five types of scaffolding are: suspended, supported, rolling, aerial, and hanging bracket.

• Suspended scaffolding is hung from the roof of a building and is commonly used for window washing or painting.

• Supported scaffolding is built from the ground up and is commonly used for construction or maintenance work.

• Rolling scaffolding is supported by wheels and ...read more

Standard size of brick is 190mm x 90mm x 90mm.

• The standard size of brick varies from country to country.

• In the UK, the standard size of brick is 215mm x 102.5mm x 65mm.

• In the US, the standard size of brick is 203mm x 92mm x 57mm.

• Bricks can also come in different shapes and sizes for specific purposes.

Cutting length in beam steel formula

• Cutting length = Development length + Lap length - (2 x Bend deduction)

• Development length = 0.87 x fy x d / (4 x σst)

• Lap length = (diameter of bar x 2) + 10 mm

• Bend deduction = 2 x diameter of bar

• fy = Yield strength of steel

• d = Depth of beam

• σst = Permissible stress in steel