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Presentation on six weeks internship at NKG Infrastructures Limited

“Construction of army residential building”

Jalandhar Cantt

Submitted by :-Md Sharique(11306175) School Of Civil Engg. Lovely Professional University

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CONTENTS Learning objectives

About project Lap joints Water Tank Batching plant Plastering(Grit wash) Defects

Conclusion

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ABOUT PROJECT Grade of concrete used - M25 Lateral ties - 10 mm and

8mm Design life - 80 years Type/Class of structure - Class A Type of foundation - Raft Designed for fire resistance - 1.5 hours

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LEARNING OBJECTIVES All reinforcement bars should be Thermo Mechanically treated steel bars of

Fe-500 grade Clear Cover to Reinforcement 1. For Footing bottom face -75mm2. Footing side and top face - 50mm3. Column - 40mm4. Beam - 25mm5. Slab - 20mm For faces of members likely to be in direct contact with ground clear cover

should be greater of either Dia of Main reinforcement bar or Equal to 50mm

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LAP JOINTS

Grade of conc.

Tension bars Compression bars

Remarks

M-25 40.5 x D 32.5 x D D is dia. Of reinforcement bars

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WATER TANK Capacity - 30,000 ltrs Material - Rcc and concrete Reinforcement used - 8 mm for tie bars and 10mm as

distribution bars bothway and 12 mm as main bars in beams.

Size of Beam - 230× 450 mm

Grade of concrete –M25 Tank is divided in 3 equal portions i.e 10,000 ltrs in each

portion and baffel walls are made. Two portions are used for drinking and other purposes while

1 portion is used as reserved for fire and other mishaps.

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15 cm

20 cm

15 cm

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200 mm c/c spacing

8 mm dia.12 mm main bars in Beam

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Fig showing 10 mm dia steel Fe500 D

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Machine Room

Water Tank

Binding wire

Hook used to tie reinforcement with help of binding wire

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Reinforcement

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Concreting

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Concreting done with concrete pump

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Beams & slab after concreting Slab after casting 15 cm

thick

Further reinforcement

Further formwork

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BATCHING PLANT

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Water Tank

Mixing unit

18Conveyor belt

Operating UnitCement Storage

Mixing Unit

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PLASTERING - GRIT WASH (EXTERNAL PLASTER) Plaster to be applied in two layers i.e after

raking first layer of 15 mm thick cement mortar (1:4) and again make surface rough.

Curing to be done for atleast 7 days

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SECOND LAYERMaking square boxes as per design using thin tapered wooden batten fixed over previous layer with nails. Battens must be removed with great care so that edges are not damaged.

Wash marble chipping with clean water before application.

Wet the previous layer with water and then apply mix.Mix should be made with marble chipping 12mm mixed in grey 65% approx. and white cement 35% approx.

1:0.5:2 where 1 proportion is of mixed grey and white cement, 0.5 is marble powder and 2 represent marble chipping of 12mm size.

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1:1/2:2

1=.65 grey cement+.35 white cement

½=marble powder

2=marble chipping

Marble chipping 12mm

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Mix made is applied in uniform thickness and is pressed properly with wooden float for proper bonding with previous layer and is finished upto true surface.After initial setting it is watered to achieve strength.H2SO4 mixed with water is used for washing and scrubbing purposes. Suitable brushes are used and top layer is scrubbed until natural colour of marble chipping is achieved.

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DEFECTS

Concrete not filled properly

24Honeycombing

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CONCLUSION Six weeks internship was very helpful to me.

I get practical knowledge that how task is executed.

I learnt about working of concrete pump, batching plant, water tank, grit wash and some defects.

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