basic concept of q

7/30/2019 Basic Concept of q

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BASIC CONCEPT OF Q.S.

BASIC CONCEPT

OF

QUANTITY SURVEYING (Q.S.)

-PREPARED BY MANIRUL ISLAM

Quantity Surveyor (Civil), Teejan, Oman1. UNITS OF MEASUREMENTS

SL.NO ITEMS

UNITFOR LABOUR

WORK

UNITFOR COMPLETED ITEM(MATERIAL+LABOUR)

01 Excavation cum / cft cum / cft

02 Back filling /

soling

cum / cft cum / cft

03 Footing

(Concreting)

No. cum / cft

04 P.C.C sqm / sft cum / cft

05 Column / Beam

/ Lintel

Concreting

rm / rft cum / cft

06 Slab

concreting

sqm / sft cum / cft

07 Pardi / Chajja /

Loft

Concreting

sqm / sft cum / cft

08 Staircase

Concreting

No. (per step) cum / cft

09 Brick masonry

10cm to 15cm

thick

sqm / sft sqm / sft

10 Brick masonry

23cm thick

sqm / sft cum / cft

11 Brick masonry

35cm thick

cum / cft cum / cft

12 U.C.R.

masonry

cum / cft cum / cft

13 Plastering /

Pointing

sqm / sft sqm / sft

14 Flooring /

Tiling

sqm / sft sqm / sft

15 Skirting / Steps rm / rft rm / rft

16 Sill Patti rm / rft rm / rft

17 Kitchen otta No. or rm / rft rm / rft

18 Painting sqm / sft sqm / sft

19 Doors /

Windows

No. or sqm / sft sqm / sft

20 Plumbing rm / rft rm / rft
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pipes

21 Plumbing

fitting /

sanitary ware

No. No.

22 Water tanks ltr. ltr.

23 Septic tanks ltr. No. of users

24 Road work

(asphalting)

sqm / sft sqm / sft

25 Electrical

cabling /

Wiring

rm / rft rm / rft

26 Electrical

points

No. No.

27 Water-proofing

to terrace

sqm / sft sqm / sft

28 Water-proofing

of W.C

No. sqm / sft

29 Gardening

(lawn)

sqm / sft sqm / sft

30 Gardening

(trees /

bushes)

No. No.

2. CONVERSION TABLE

SR.NO UNIT EQUIVALENT UNITS

01 1 meter 100 centimeter

02 1 meter 3.28 feet

04 1 centimeter 0.393 inch

05 1 foot 0.305 meter

07 1 inch 2.54 centimeter/ 25.4 mm

08 1 tone 1000 kg

09 1 kg 1000 grams

10 1 kg 0.001 tone

11 1 gram 0.001 kg

13 1 sq meter 10.76 sq feet

14 1 brass 100 sq feet

15 1 brass 9.29 sq meter

16 1 cu meter 35.28 cu feet

17 1 cu meter 1000 liters

18 1 cu feet 28.315 liters

19 1 brass 100 cu feet

20 1 cu feet 0.0283 cu meter

21 1 liter 0.001 cu meter


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22 1 liter 0.0353 cu feet

23 1 cu feet 0.01 brass

24 1 cu meter 0.35 brass

3. WEIGHTS OF BUILDING MATERIAL

SR.NO MATERIAL THEORETICAL WEIGHT IN Kg/cum

01 Cement 1440

02 Steel 7850

03 Dry sand 1600

04 River sand 1840

05 Stone 2850 to 2960

06 Water 1000

07 P.C.C 2240

08 R.C.C. (2% steel) 2420

09 Bricks 1600 to 1920

10 Brick masonry 192011 Soil 1760

12 Cement concrete block (solid) 1800

13 Cement mortar 2080

14 Lime mortar 1760

15 Lime 640

16 Glass 2530

17 Teak wood 670 to 830

18 Sal wood 990

19 Marble stone 2620

20 Granite stone 2460 to2800

21 Cuddappa 2720

22 Bitumen 1040

RATE

ANALYSIS

1. P.C.C. FOOTING (1:3:6)

Consider 10 cum volume.

Volume of dry concrete = 15.2 cum. (Adding 50 to 52% for compaction, wastages etc)

Proportion (1:3:6) = 1+3+6 = 10


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Volume of cement = 15.2/10 = 1.52 cum.

= 1.52/0.035 = 43.4 bags ~ 44 bags.

Volume of sand = 1.52 X 3 = 4.56 cum.

Volume of metal = 1.52 X 6 = 9.12 cum.

MATERIAL QTY RATE PER AMOUNT

CEMENT 44 265 Rs. Bag 11660.00

SAND 4.56 1270 Rs. Cum 5791.20

METAL 9.12 900 Rs. Cum 8208.00

LABOURS NO. RATE PER AMOUNT

HEAD MASON 02 400 Rs. Day 800.00

MASON 04 250 Rs. Day 1000.00

MALE COOLIE 16 200 Rs. Day 3200.00

FEMALE COOLIE 07 150Rs. Day 1050.00

TOTAL = 31709.2

TOOLS & PLANTS L.S. 1% = 317.092

TOTAL=31709.2+317.092 = 32026.292

WATER & ELECTRIC CHARGES 2% = 640.52

TOTAL=32026.292+640.52 = 32666.818

CONTRACTORS PROFIT 25% = 8166 .705

GRANT TOTAL= 3266.818+8166.705 = 40833.505

RATE FOR 10 CU.M = 40833.505 Rs.

RATE FOR PER CU.M = 4083.350 Rs.

2. BRICK WORK


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Considering 1:4 ratios for cement mortar in 150mm thick brickwork.

Calculation of quantity for 5 cu.m volume in brickwork as follows:

Size of brick = 19 cm x9 cm x9 cm.

Vol. of brick = (0.19 x 0.09 x 0.09) cu.m

= 0.00154cu.m.

Vol. of brick with cement mortar

= (0.2 x 0.1 x 0.1) cu.m

= 0.002 cu.m.

No. of bricks in 5 cu.m

= 5 (vol. of one brick with mortar).

= 5 0.002

= 2500

Vol. of 2500 bricks = 2500 x vol. of one brick without mortar.

=2500 x 0.00154

= 3.85cu.m.

Vol. of mortar = 5 3.85 = 1.15 cu.m.

Add 15% (Bulkage + wastage)

\ Vol. of wet mortar = 1.15 + {1.15 x (15 100)}

= 1.323cu.m

Vol. of dry mortar = 1.323 + 33% in wet mortars for interlocking =1.759cu.m

Vol. of cement = 1.759 (1+4) =0.352cu.m

\ No. of cement bags = 0.352 0.035

=10.057bags.


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10.00bags

Vol. of sand = 0.352 x 4

= 1.408cu.m.

ITEM DESCRIPTION QUANTITY RATE RS. AMOUNT RS.

a. Material

Cement

Sand

Bricks

10 bags

1.408 cu.m

2500 Nos.

250/bag

1270/cu.m

4/no.

2500.00

1788.16

10000.00

Mason

Head Mason

Male coolie

4

1

10

250/day

400/day

200/day

1000.00

400.00

2000.00

Total 17688.16

c. Tools & Plants 1% 0f total 176.88

Total 17865.04

d. Water charges 2% Of total 357.30

Total 18222.34

e. Supervisor, Overhead & Profit 25% Of the total 4555.58


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Total 22777.92

RATE FOR 5 CU.M = 22777.92 Rs.

RATE FOR PER CU.M = 4555.58 Rs.

3. R.C.C. COLUMN

Consider 10 cum volume.

Grade of concrete M 40

Proportion (1: 1.808:1.616) 1+1.808+1.616= 4.424 {as per mix design}

Volume of dry concrete = 15.2 cum. (52% for compaction & wastages)

Volume of Cement = 15.2/4.424 = 3.435 cum.

Cement bags = 3.435/0.035 = 98.12 ~ 99 Bags.

Sand = 3.435 X 1.808 = 6.21 cum.

Metal = 3.435 X 1.616= 5.55 cum.

MATERIAL QTY RATE PER AMOUNT

CEMENT 99 265 Rs. Bag 26235.00

SAND 6.21 1270 Rs. Cum 7886.70

METAL 5.55 900 Rs. Cum 4995.00

LABOURS NO. RATE PER AMOUNT

HEAD MASON 1 400 Rs. Day 400.00


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MASON 3 250 Rs. Day 750.00

MALE COOLIE 16 200 Rs. Day 3200.00

BHISTI 7 150 Rs. Day 1050.00

CARPENTER 4 200 Rs. Day 800.00

HELPER 8 125 Rs. Day 1000.00

TOTAL = 46316.7

Tools & Plants charges 1% = 463.167

TOTAL=46316.7+463.167 = 46779.86

Water charges 2% = 935.59

TOTAL=46779.86+935.59 = 47715.45

Contractors profit 25% = 11928.8

TOTAL = 47715.45+11928.8 = 59644.31

RATE FOR 10 CUM = RS. 59644.31/-

RATE FOR PER CU.M = RS. 5964.43/-

4. INTERNAL PLASTER

12mm thick internal plaster

Considering 100sqm area

Proportion of C:M = 1:4

Summation of proportion =5


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Quantity of one cement bag = 0.035cum

Quantity of wet mortar = 0.012 x 100 = 1.2cum

Adding 15% wastage = 1.2 + (1.2 x 0.15) =1.38cum

Volume of dry mix = 1.38 + (1.38 x 1/3) =1.84cum

Volume of cement = (dry volume / 5) x 1

= (1.84 /5) x 1

= 0.368cum

= 0.368 / 0.035

=10.5 bags

Volume of sand = (dry volume / 5) x 4

= (1.84 /5) x 4

= 1.472 cum

MATERIALS QUANTITY RATE (RS) AMOUNT (RS)

Sand 1.472cum 1300 /cum 1913

Cement 10.5bags 250 / bag 2625

Scaffolding L.S 550 550

LABOURS QUANTITY RATE (RS) AMOUNT (RS)Mason 8nos 200 1600

Helper 12nos 90 1080

Total 7768

Tools & Plants 1% 0f total 77.68

Total 7845.68

Water charges 2% Of total 156.91

Total 8002.59


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Supervisor, Overhead & Profit 25% Of the total 2000.65

Total 10003.23

RATE FOR 100m = 10003.23Rs.

RATE FOR 1m = 100.03Rs.

5. EXTERNAL PLASTER

20mm thick external plaster

Considering 100sqm area.

Proportion for mix C:M = 1:4.

Summation of proportion = 5.

Quantity of one cement bag = 0.035cum.

Quantity of wet mortar = 0.02 x 100 = 2cum.

Adding 20% wastage = 2 +( 2 x 0.2 ) = 2.4cum.

Volume of dry mix = 2.4 + (2.4 x 1/3) = 3.2cum.

Volume of cement = (dry volume / 5) x 1

= (3.2 /5) x 1

= 0.64cum

= 0.64 / 0.035

= 18.3 bags

= 19 bags

Volume of sand = (dry mix / 5) x 4

= (3.2 /5) x 4

= 2.56cum.

PARTICULAR QUANTITY RATE(RS) AMOUNT(RS)

Materials


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Sand 2.56cum 1300 3328

Cement 19bags 250 4750

Scaffolding L.S. 550 550

Labors

Mason 8nos 200 1600

Helper 12nos 90 1080

Total 11708.5

Tools & Plants 1% 0f total 117.08

Total 11825.60

Water charges 2% Of total 236.512

Total 12062.112

Supervisor, Overhead & Profit 25% Of the total 3015.53

Grand Total 15077.64

RATE FOR 100m = 15077.64Rs.

RATE FOR 1m =150.77Rs.

USEFULL DATA FOR ESTIMATION

Mixer Machine Capacity:

Sr. No: Capacity Dry volume in cumWet volume incum

Output per hourPetrol consumption per hourin litre

Remarks

1 6' / '4' 0.170 0.113 2.266 1.000

Each batch of concrete requireabout 3 minutes of mixing

2 7' / '5' 0.198 0.142 2.832 1.400

3 10' / '7' 0.283 0.198 3.965 1.700

Cement Mortar:

Sr. No: Ratio Cement in Kg Cement in bag Sand in 'cum'. Remarks
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1 1 : 1' 1054 21.08 0.73

Water may be generallytaken as 140 litres per 'cum'.

50 kg. cement bag size is (400350mm x 250mm internally. Vper is = 0.035 'cum'.

2 1 : 2' 686 13.72 0.96

3 1 : 3' 491 9.82 1.02

1 1 : 4' 380 7.60 1.05

5 1 : 6' 253 5.06 1.05

6 1 : 8' 192 3.84 1.06

Cement Concrete:

Sr. No: Ratio Cement in Kg Cement in bag Sand in 'cum'. Aggregate in 'cum'. Remarks

11 : 4 : 8' NominalMix

161 3.22 0.45 0.89

21 : 3 : 6' NominalMix 212 4.24 0.44 0.88

3 1 : 2 : 4' M15 317 6.34 0.44 0.88

4 1 : 1.5 : 3' M20 403 8.06 0.42 0.84

5 1 : 1 : 2' M25 555 11.10 0.385 0.77

Remarks

Considering dry density of concrete is 1.54 'cum'.

Aggregate may be used 60% : 40% ratio of 20mm and 10mm down respectively.

Water required for concrete varies from 28 to 35 litres per bag of (50kg) cement depending on the mix and proportion.

Reinforcement (Steel) works:

Reinforcement usually required in various situation is as follows:

Culvert and foundaion = 0.5% to 1%

Slab and landing = 0.5% to 1.5%

Arch, wal, floor and flate roof = 1% to 2%

Column and brace = 2 % to 3%

Column and brace = 2 % to 3%

Pile = 2% to 5%

Remarks


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Binding or tying wire for reinforcement may be taken as 0.9 to 1.3 kg per quintal of reinforcement.

One 50 kg. bag of cement will make approximately following volume of concrete:

The equivalent size of a box for 50 kg. cement bag is 400mmx350mmx250mm internally.

0.133 'cum' of 1 : 1.5 : 3 concrete.

0.166 'cum' of 1 : 2 : 4 concrete.

0.140 'cum' of 1: 1 : 2 concrete.

0.250 'cum' of 1: 3 : 6 concrete.

0.333 'cum' of 1: 4 : 8 concrete.

0.400 'cum' of 1: 5 : 10 concrete.

0.500 'cum' of 1: 6 : 12 concrete.

basic concept of q

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