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An arch bridge having span length of 10.25 m is being constructed. The wearing course slab thickness is 325 mm. If the first arch is cast today, after how many days should the props be removed?

An arch bridge having span length of 10.25 m is being constructed. The wearing course slab thickness is 325 mm. If the first arch is cast today, after how many days should the props be removed? Correct Answer 21

Explanation:

As per IS 456:2000 clause No 11.3.1 

Type of Formwork 

Minimum Period before striking formwork
a) Verticalfonnwork to columns, walls, beams 16-24 hr
b) Soffitformwork to slabs (Props to be refixed immediately after removal of formwork) 3 days
c) Soffitfonnwork to beams (Props to be refixed immediately after removal of formwork) 7 days

d) Props to slabs:

1) Spanning up to 4.5 m

2) Spanning over 4.5 m

 

7 days

14 days

e) Props to beams and arches:

1) Spanning up to 6 m

2) Spanning over 6 m

 

14 days 

21 days

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