In normal circumstances, formwork of slabs may be removed (Props left under) after expiry of -

Question

Question

This question was previously asked in

UKPSC JE Civil 8 May 2022 Official Paper-I

Answer 1

Concept:

As per IS 456 2000, minimum period before striking formwork for various components are as follows-

Type of Formwork	Minimum Period Before Striking Formwork
Vertical formwork to columns, walls, beams	16-24 h
Soffit formwork to slabs (Props to be re-fixed immediately after removal of formwork)	3 days
Soffit formwork to beams (Props to be re-fixed immediately after removal of formwork)	7 days
Props to slabs:1) Spanning up to 4.5 m 2) Spanning over 4.5 m	7 days 14 days
Props to beams and arches: 1) Spanning up to 6 m 2) Spanning over 6 m	14 days 21 days