Shuttering PPT.pptx

PPT ON SHUTTERING

1. PRESENTATION ON SHUTTERING/FORMWORK

2. INTRODUCTION OF SHUTTERING Shuttering is the temporary structure used as a mould to caste structural members at site . These are also known as farmas or formwork. It is erected at it’s correct position before concrete is poured in it. This poured concrete is then consolidated and allowed to harden to give desired strength and shape. Shuttering is a mould including all supporting structures, used to shape and support the concrete until it attains sufficient strength to carry its own weight.

3. It should be strong. It should be water tight. It can be reusable. QUALITIES OF SHUTTERING Its contact surfaces should be uniform. It should be according to the size of Structural member.

4. CATEGORIES OF SHUTTERING Conventional Shuttering Modern Day Shuttering Conventional Shuttering :- The Shuttering is built on the site out of timber or plywood. It Is easy to produce but more time consuming for larger structures. Plywood facing Has a relatively Shorter Life Span . Low Labour Cost.

5. Modern Day Shuttering :- This Formwork Systems are mostly modular, Which is designed for efficiency. They are designed to increase accuracy and minimize the waste in construction. These have more safety features as compared to conventional shuttering. They are less time consuming for larger structures. High labour cost.

6. MATERIAL USED FOR SHUTTERING :- TIMBER AND PLYWOOD:- It is most common material used for bracing the member, hence called traditional shuttering/formwork. It can easily be cut to size on site. In timber shuttering, joints are replaced with engineered wood beams and supports are replaced with metal props. This Make this method more systematic and reusable. Plywood Formwork

7. MATERIAL USED FOR SHUTTERING :- STEEL :- Steel shuttering are stronger, durable and have longer life then timber and plywood. It can be installed and dismantled with greater ease and speed. Steel Shuttering does not absorb moisture from concrete. It does not shrink and swell with temperature.

8. MATERIAL USED FOR SHUTTERING :- ALUMINIUM :- It often used in pre fabricated formwork. Tha is put together at site. Aluminium is strong and light. It required fewer supports and ties. The lighter section will deflect more, but it can be avoided by simply following the manufacturers recommendations.

9. MATERIAL USED FOR SHUTTERING :- PLASTIC :- Glass reinforced plastic (GRP) and vaccum formed plastics (VFP) are used when complicated concrete shapes are required. Vaccum formed platics always need supports but GRP is fabricated with integral bearers and make it self-supporting.

10. Requirements Of Shuttering Containment Resistance To Leakage Accuracy Ease Of Handling Strength Reuse Potential Economical Light In Weight

11. REQUIREMENTS OF SHUTTERING:- Material should be cheap and reusable. It should be practically water proof, so that it should not absorb water from concrete. Swelling and shrinkage should be minimum. Strong enough to with stand all external loads. Deflection should be minimum. Surface should be smooth. Light in weight, so that easy to transfer.

12. STAGES OF SHUTTERING :- 1. Assembly and erection 2. Concrete placement 3. Dismantling

13. SHUTTERING FOR DIFFERENT STRUCTURAL MEMEBERS:- Wall Column Slab Beams Stairs Foundation Water Tanks

14. TIME OF REMOVAL FOR SHUTTERING :- SR. NO. Structural Member Ordinary Portland Cement(OPC) Rapid Hardening Cement 1 Beam sides, Walls and Column 2-3 Days 2 Days 2 Slabs (Vertical supports remains intacts 4 Days 2 Days 3 Slab (Complete formwork remove) 10 Days 5 Days 4 Beams (Removal of sheets, props remain intact) 8 Days 5 Days 5 Beams And Arches (Complete formwork removal upto 6m span) 14 Days 5-8 Days 6 Beams And Arches (Complete formwork removal more than 6m span) 21 Days 8-10 Days

15. ➢ For normal works cost of shuttering is about 30%-40% of the concrete cost. ➢ For special works cost of shuttering is about 50%-60% of the concrete cost. ➢ Shuttering cost is controlled by the following factors • Shuttering Material cost • Shuttering erecting cost • Shuttering removal cost • Shuttering jointing cost (Nails and Cables) • Labor charges. COST OF SHUTTERING

16. LOADS ON SHUTTERING :- • Dead load ▪ Self weight of shuttering ▪ Concrete load ▪ Reinforcement • Imposed load ▪ Construction workers ▪ Stacking of materials • Environmental loads ▪ Accidental loads ▪ Wind loads

17. MAINTANANCE OF SHUTTERING • Due to continuous use wooden planks & steel plates surfaces become uneven and require maintenance . • For wooden formwork use cardboard or plastic fiber board. Bolt hole places must also be repaired . • For steel formwork plates must be leveled and loose corners must be welded .

18. Thank You