WorksheetsDAY 23 ITI WORKSHEET (Formwork and Timbering)(10/10) Quiz
Total questions: 15
Worksheet time: 8mins
The primary purpose of formwork in construction is to:
Strengthen steel reinforcement
Support fresh concrete until it hardens
Form a base for plastering
Hold masonry walls
Which of the following materials is commonly used for modern formwork?
Straw mat
Timber only
Plywood and steel
Mud blocks
A good formwork should be:
Weak but watertight
Easily removable and water-tight
Permanent and heavy
Only made of wood
The vertical formwork for columns can be removed after approximately:
16-24 hours
24 – 48 hours
5 days
10 days
Beam soffits (with props left under) can be removed after:
3 days
7 days
10 days
21 days
Timbering of trenches is used to:
Increase excavation depth
Prevent side walls from collapsing
Improve drainage
Support foundation steel
The main plank in contact with the trench wall is called:
Strut
Sheeting
Bracing
Ranger
Box sheeting is suitable for:
Hard rock excavation
Firm ground up to 2 m
Loose soil up to 4 m depth
Deep excavation up to 15 m
Stay bracing is adopted for:
Loose soil up to 10 m
Firm soil up to 2 m
Very soft soil
Sandy soil over 5 m
The _______ method is similar to box sheeting except that the work is carried out in stages and at each stage, and offset is provided.
Sheet piling
stay bracing
Box sheeting
vertical sheeting
Sheet piling is adopted for:
Small pits only
Large deep excavations
Rock foundations
Pavement work
Centering for arches is removed only after:
1 day
Concrete gains strength
Arch form set is dry
Laggings fixed
Plywood formwork can be reused about:
3 – 5 times
7 – 10 times
15 – 20 times
25 – 30 times
Match the components of formwork with their functions:
A–4, B–2, C–3, D–1
A–1, B–2, C–3, D–4
A–2, B–1, C–3, D–4
A–3, B–2, C–1, D–4
Write down the stripping time for different types of formwork, as per IS 456
(a)
