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Match the following types of formworks with their minimum required striking period.

a.

16-24 hours

1.

Soffit formwork to slabs

b.

7 days

2.

Props to beams and arches spanning up to 6 m

c.

14 days

3.

Vertical formwork to columns, walls, and beams

d.

3 days

4.

Props for slabs spanning up to 4.5 m


1. a - 3, b - 2, c - 4, d - 1
2. a - 4, b - 3, c - 2, d - 1
3. a - 3, b - 4, c - 2, d - 1
4. a - 3, b - 4, c - 1, d - 2

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Correct Answer - Option 3 : a - 3, b - 4, c - 2, d - 1

Concept:

As per IS 456:2000, the minimum period before striking formwork is as follows:

Type of Formwork

Minimum Period Before Striking Formwork

Vertical formwork to columns, walls, beams.

16 - 24 h (1 Day)

Soffit formwork to slabs

3 days

Soffit formwork to beams

7 days

Props to slabs

a. Spanning up to 4.5 m

b. Spanning over 4.5 m

 

7 days

14 days

Props to beams and arches

a. Spanning up to 6 m

b. Spanning over 6 m

 

14 days

21 days

Hence, Option C is correct. 

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