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Quantity Take Off Dr. Ayman A. Abu Hammad Applied Science University.

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Presentation on theme: "Quantity Take Off Dr. Ayman A. Abu Hammad Applied Science University."— Presentation transcript:

1 Quantity Take Off Dr. Ayman A. Abu Hammad Applied Science University

2 Topical Overview Chapter 1: Site Preparation Chapter 2: Soil and Site Exploration Chapter 3: Excavation Chapter 4: Foundations Work Chapter 5: Wood Formwork Chapter 6: Steel Rebar Chapter 7: Concrete Chapter 8: Building structures Chapter 9: Walls Construction Chapter 10: Brick Works Chapter 11: Masonry (Stone) Chapter 12: Stair Wells

3 Finishing Civil Works Floor X Planning: Schedule Project team Subcontractors Suppliers Submittals workforce Site electricity, access roads, phone line, water, heat Cars Mobilization: Site offices Off. furniture Computer, phone, Workers residence Cement-agg.-rebar Sto. Tools & equip. Security fence Notice to proceed Letter of intent Foundations center lines Excavation: 1- Bulk Exc. 2- Trimming Foundations rebar fabrication Blinding forms- cast RC foundations forms- rebar Foundations RC cast Found. Wall forms- rebar Found. wall cast Compacted backfill Floor on grade: rebar- cast Columns forms- rebar Slab # 1 forms- rebar Masonry Slab # 1 cast Cast column & walls Side walks 2- Weeks Retaining Walls, fence RC walls: forms-rebar cast Dismantle slab 1 forms 2-3-4… Partition walls- block work E&M rough Plaster Tile Doors-wind. Paint

4 Rebar Take-off Rules Steel diameters are: –8, 10, 12, 14, 16, 18mm…. Rebar Standard Lengths are: –4, 5, 6, 7, 12m. Overlap standard distance is= 40*max Diameter for tension, 50*max Diameter for compression. Cover distance = 0.005m in foundations only and 0.025m otherwise. Stirrup key is 0.1 *2= 0.2m Rebar order format is as follows: –Calculated Number Ø Standard Diameter/ Standard Length Rebar volume is negligible in concrete quantity take-off. AGGREGATE REBAR DATA FOR SIMILAR DIAMETERS AND LENGTHS ONLY! FOR TONNAGE ESTIMATION MULTIPLY THE NUMBER BY THE LENGTH BY THE UNIT WEIGHT OF BAR. SHOULD TRANSLATE TAKE-OFF NUMBERS ON THE A-CADS. Rebar Steps: –Foundations: Strip, Isolated, Tie beams, FW –Floors, Columns, Walls, Retaining Walls, lintels –Slabs: P Beams, S Beams, Double Rib, Wall Beams, Ribs

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6 3.5mx4.5mx3m interior dim. Reservoir Foundation: –Stirrups: –[(4.8-0.05)*2]+[(0.35-0.05)*2]+0.2= 10.3m –Res. Length=4.5+0.65+0.65=5.8m –[5.8*5]+1= 29 +1=30 stirrup –30D16/5m+30D16/6m –Longitudinal: Top bars= 4.8*7= 34 bar, length= 4.5+0.65+0.65=5.8m 6m 68D14/6m Walls: –Vertical: length= 2.95m+0.35+0.20= 3.5m Wall perimeter={2*(3.5+[0.25 C-C])}+{2*(4.5+[0.25C-C])}= 17m Number of longitudinal bars= 17m*8bars per meter= 136 bar 136D12/7m –Longitudinal: Short wall length= 3.5+(0.25*2)= 4m Long wall length= 4.5+(0.25*2)= 5m Number of longitudinal bars= 3m*10*2= 60 120D14/4m 120D14/5m 6m5m Overlap=40*max diam.= 0.64m 0.64

7 Concrete for Water Reservoir

8 Isolated Foundation 2.5m*3m*0.45m & Column0.25m*0.6m. FWH=1.3m Stirrups: –(2*[(2.5-0.05)+(0.45-0.05)])+0.2= 5.9m 6m –Number of stirrups= 3m*5stirrups per meter= 15+1=16 –16D16/6m Longitudinal: –(2*[(3.00-0.05)+(0.45- 0.05)*2])+0.2= 6.9m 7m –Number of stirrups= 2.5m*7stirrups per meter= 18 –17D14/7m Column C1: –Column Dowels: length=1.3+0.45+0.3+(overlap=40 *16mm=0.65m)= 2.70m 3m 8D16mm/3m 4D16mm/6m –C1 above FL= 3.12(12 stones height)+0.3(slab)+0.64(overlap)= 4m 8D16/4m 0.45m 7 D14mm/1m Wall height=1.3m 5D16mm/1m 8D16mm 7D8mm/1m 1.125m0.25m 2.5m 1.125m 0.65 overlap

9 Civil Drawings (Foundations Drawings) 1 A

10 1 A f1c1 TB

11 Civil Drawings (Foundations Drawings) 1 A f1c1 TB S1-1 S2-2 S3-3 TB 4.00 9.50 13m 3.7 5m 4.6 3 9.5 6 6 3 5 7 5 5 77 5 3 3.5 4 4

12 Strip Footings 1.4 0.50 10*12mm 5*14mm/1m 0.10 S1-1 (Stair Case) 0.10 0.2 1.6 0.60 0.10 S2-2 (Stone) 0.10 0.3 6*16mm/1m 12*14mm 5Q12/1m 0.40 1m 0.50 6*12mm 5*12mm/1m 0.10 S3-3 (Balcony) 0.10 0.2

13 Strip foundations Rebar S1-S1 S1-S1: 2 strips /6m& 2 strips/ 3m=3 strips length 6m –Stirrup length: [(1.4 -0.05)*2+(0.5-0.05)*2] + 0.2= 3.80= 4.00m –Stirrup count (compute length of foundation center to center): [(6m-1.4)*2+ (3-1.4)*2]=12m Count= 12*5 stirrups/m= 60 60Q12/4m –Longitudinal rebar: 3*10 Q12/6= 30Q12/6m

14 S2-S2 Longitudinal Rebar: –1 strip of length 4m 2Q12/4 12Q14/4 –3 strips of length = 5m 2*3stripsQ12/5= 6Q12/5 12*3stripsQ14/5= 36Q14/5 –4 strips of length 7m 2*4Q12/7= 8Q12/7 12*4Q14/7= 48Q14/7 Stirrups: 1) [(1.6-0.05)*2+(0.6-0.05)*2]+0.2= 5m 2) [(1-0.05)*2+(0.3-0.05)*2)]+0.2= 2.6= 3 –S1-S1 length Center to center= 38m 1) 38*6Q16/5= 228Q16/5m 2) 38*5Q12/3= 190Q12/3= 95Q12/6 1.6 0.60 0.10 S2-2 (Stone) 0.10 0.3 6*16mm/1m 12*14mm 5Q12/1m 0.40

15 Square Isolated Footings 2.6m 0.60 0.10 F1 0.10 0.3 6*16mm/1m two way 0.60 0.30 5*12mm/1m 6*12mm Tie Beam TB 0.30 5*8mm/1m 6*16mm C1 0.60 0.20 5*8mm/1m 6*14mm CW1 0.50 3.2m 1.3m

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17 Civil Drawings (Roof Drawings) 4 B1 B2 B3 SB 0.20 14-18-24 40 SB B2 2*12/3m 2*10 DR CR B1 10*16/4 2*18/7 7*16/5 4*14/12 6*16/6 B2 12*16/4 8*16/7 8*14/5 8*14/6 B3 8*18/8 4*14/6 3*14/6

18 3*18/3.5m 5*16/4m 5*168*16 4*16 3*14 6*164*14 3m5m5.5m2.5m 5*16/2.5m 4*16 1.00m 0.3 4*14 5*16 2*8/20cm B1 (1:15) B1 (1:100) Roof Details 4*16 4*14 5. m4m 6*16/4m 4*16 1.00m 0.3 4*14 6*16 2*8/20cm B2 (1:15) B2 (1:100) 4*14 5. m2.5m 8*18/8 1.00m 0.3 4*14 6*16 2*8/20cm B3 (1:15) B3 (1:100) 6*14 0.30m 0.36*16 *8/20cm SB (1:15) 0.30m 0.34*16 *8/20cm DR&CR (1:15) B1 10*16/4 2*18/7 7*16/5 4*14/12 6*16/6 B2 12*16/4 8*16/7 8*14/5 8*14/6 B3 8*18/8 4*14/6 3*14/6

19 Slab Rebar

20 3.74.35 2.9 3.00 1.1 5.0 3.52.5

21 Masonry Types: Zawyah: 1 Lm per piece Silah: Araqa & Kalb: 1 Lm per piece Dustour: 2 Lm per piece Marabee: 4 Lm per piece Roukh: 1 Lm per piece Arch: 3 Lm per piece Balcony: each 1 Lm is taken as 2 Lm Burtash: each 1 Lm is taken as 4 Lm

22 1.00 2.00 0.50

23 Masonry Take off Regular Masonry Take Off: –4*(9.5-[1+4*0.25])= 30 LM –10 (9.5-[5+10*0.25]= 20 LM –2(9.5-[5+2*0.25]= 8 LM –11(9.5-[2*0.25]= 99 LM Masonry Pieces Take Off: –Lintels (Burtash)= 2*(2.2) + 6*(1.20) = 4.4+7.2= 11.60 LM –Corner Stones= 27*2= 54 –Opening corner stone= (10*7)+18= 88

24 Quantity Takeoff: Steel Estimating Steel bar standard diameters: 8mm, 10mm, 12mm, 14, 16, 18, 20, 32 Steel bar standard lengths: 4, 5, 6, 7, 12 Steel overlapping follow rule 40 * Q –If you have two bars of 10mm and 16mm, find the overlap distance? –Select the higher diameter and multiply with 40= 16*40=640=64cm Distinguish between different types of steel

25 Working Example: Bathroom Quantity & Pricing: Given information: 3.6*2*3 Window: 0.7*1.00 Door: 0.8*2.1 Bath tub: 0.7* Ceramic: –Ceramic Floor: 2.9*2= 6m 2 –walls: 11.2*3= 33.6 (33.6-[0.7+(0.8*2.1)])= 31.2 +2.7*0.15= 0.405 31.2+0.405= 31.6 Plaster quantity –Ceramic walls quantity= 31.6-0.7= 30.9m 2 Ceramic labor cost –12KD for blinding= 12KD –20KD*3days= 60KD –Joint filling: 1*12KD skilled rate= 12KD Ceramic material cost= 3KD/m 2 *37m 2 = 111KD Total Cost= 111+12+60+12= 195KD Plaster:= 31.6m 2 Plaster material (fine aggregate) cost= 31.6*0.02*1.1= 0.7m 2 *2KD= 1.4KD Plaster cement cost (1:3 means 10 cement bags per m 3 )= 7bags* 1.350= 9.450 Labor cost:2days*20KD=40KD Total cost= 1.4+9.5+ 40= 51KD


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