Applied Science University Quantity Take Off Dr. Ayman A. Abu Hammad 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 Foundations rebar fabrication Letter of intent Planning: Schedule Project team Subcontractors Suppliers Submittals workforce Site electricity, access roads, phone line, water, heat Cars Notice to proceed Excavation: 1- Bulk Exc. 2- Trimming RC foundations forms- rebar Dismantle slab 1 forms Retaining Walls, fence 2- Weeks Floor X Masonry Slab # 1 cast Slab # 1 forms- rebar Cast column & walls RC walls: forms-rebar cast Tile Civil Works Foundations RC cast Found. Wall forms- rebar Side walks Plaster Paint Blinding forms- cast Columns forms- rebar E&M rough Doors-wind. Foundations center lines 2-3-4… Finishing Partition walls- block work Mobilization: Site offices Off. furniture Computer, phone, Workers residence Cement-agg.-rebar Sto. Tools & equip. Security fence Found. wall cast Compacted backfill Floor on grade: rebarcast Rebar Take-off Rules • Steel diameters are: – • 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: – • • • 8, 10, 12, 14, 16, 18mm…. 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 4 D12mm/1m Wall height=3m 5 D14mm/1m 5D16mm/1m 0.35m 0.4m 0.25m 7 D14mm/1m 3.5m 4.8m 0.25m 0.4m 3.5mx4.5mx3m interior dim. Overlap=40*max diam.= 0.64m 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: 6m • 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 5m 0.64 Concrete for Water Reservoir Concrete of Foundations L W H volume Water reservoir Blinding 5.0 6.0 0.1 3.0 RC 4.8 5.8 0.35 9.7 17.0 0.3 3.0 12.8 Walls Rebar of foundation w ater reserv LengthCount foundation stirrups 10.3 6m 29.0 29Q16/6 5m 29.0 29Q16/5 foundation longitudinal12.3 6m 34.0 34Q14/6 7m 34.0 34Q14/7 Walls vertical rebar 17.00 3.65 Wall longitudinal rebar 136 136Q12/4 4m 60 60Q14/4 5m 60 60Q14/5 68Q12/7 Isolated Foundation 2.5m*3m*0.45m & Column0.25m*0.6m. FWH=1.3m • Stirrups: – – – • Longitudinal: – – – • (2*[(2.5-0.05)+(0.45-0.05)])+0.2= 5.9m6m Number of stirrups= 3m*5stirrups per meter= 15+1=16 16D16/6m (2*[(3.00-0.05)+(0.450.05)*2])+0.2= 6.9m7m 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 0.65 overlap 8D16mm Wall height=1.3m 7D8mm/1m 5D16mm/1m 0.45m 7 D14mm/1m 1.125m 0.25m 1.125m 2.5m Civil Drawings (Foundations Drawings) A 1 Civil Drawings (Foundations Drawings) A 1 TB TB f1c1 f1c1 TB TB TB TB A Civil9.5Drawings (Foundations 6 S1-1 Drawings) 1 4.00 S1-1 7 S2-2 3 TB TB TB f1c1 3.5 S2-2 f1c1 4.6 3.5 TB TB 3 3 6 S1-1 5 5 9.50 S1-1 TB 4 S2-2 TB 4 S3-3 S2-2 TB 5 S3-3 7 S2-2 13m 7 5 3.7 5m Strip Footings 0.2 0.3 5Q12/1m 6*16mm/1m 0.40 5*14mm/1m 0.50 10*12mm 0.60 0.10 0.10 0.10 1.4 0.10 12*14mm 0.10 0.10 1.6 S1-1 (Stair Case) S2-2 (Stone) 0.2 5*12mm/1m 0.50 6*12mm 0.10 0.10 1m 0.10 S3-3 (Balcony) 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 S2-S2 • Longitudinal Rebar: – • • – 2*3stripsQ12/5= 12*3stripsQ14/5= 6Q12/5 36Q14/5 4 strips of length 7m • • • 2Q12/4 12Q14/4 3 strips of length = 5m • • – 0.3 1 strip of length 4m 2*4Q12/7= 12*4Q14/7= 8Q12/7 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 5Q12/1m 6*16mm/1m 0.40 0.60 0.10 12*14mm 0.10 0.10 1.6 S2-2 (Stone) Square Isolated Footings 0.3 1.3m 6*16mm/1m two way 3.2m 5*8mm/1m 6*14mm 0.20 0.60 0.10 0.50 CW1 0.10 2.6m 0.10 F1 5*8mm/1m 5*12mm/1m 0.60 6*12mm 6*16mm 0.30 0.60 C1 0.30 Tie Beam TB Concrete of Foundations Water reservoir Blinding RC Walls volume H W L Subtotal 5 4.8 17 6 5.8 0.3 0.1 0.35 3 3 9.7 12.8 3.4 2.6 0.3 2.8 3.2 0.6 0.1 0.6 1.3 0.952 4.992 0.234 Isolated F1 blinding RC FW Strip blinding 1-1 blinding 2-2 blinding 3-3 12.4 39.3 7.7 1.6 1.8 1.2 0.1 0.1 0.1 1.984 7.074 0.924 S1-S1 S2-S2 S3-S3 FW 12.4 39.3 7.7 59.4 1.4 1.6 1 0.3 0.5 0.6 0.5 1.3 8.68 37.728 3.85 23.166 TB blinding TB 15.4 15.4 0.5 0.3 0.1 0.6 0.77 2.772 Columns 1.1232 3.12 0.6 0.3 2 Concrete volume block volume 1 block volume rib block count Slab Volume 273 0.01848 5.04504 33.95496 39 14.704 Blinding 15 137.877 RC 25 Slab Civil Drawings (Roof Drawings) 4 14-18-24 40 SB 2*10 2*10 2*12/3m SB B2 CR SB B1 B1 SB B1 SB B2 B2 2*10 SB B2 B1 SB SB SB SB SB 0.20 DR DR SB B3 B3 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 3*18/3.5m 5*16 3*14 8*16 6*16 3m 5*16/4m 5m 4*16 5*16/2.5m 4*16 4*14 5.5m 2*8/20cm 5*16 4*14 0.3 2.5m 1.00m B1 (1:15) B1 (1:100) 0.3 *8/20cm 6*16 4*16 6*16/4m 0.30m SB (1:15) 4*14 0.3 5. m 0.3 4*16 *8/20cm 4*16 4m B2 (1:100) 0.30m DR&CR (1:15) 8*18/8 4*14 Roof Details 5. m B3 (1:100) 6*14 2.5m 0.3 2*8/20cm 6*16 B1 4*14 10*16/4 1.00m 2*18/7 7*16/5 B2 (1:15) 4*14/12 6*16/6 B2 2*8/20cm 12*16/4 6*16 4*14 8*16/7 8*14/5 1.00m 8*14/6 B3 (1:15) B3 8*18/8 4*14/6 16 8Q16 Slab Rebar 5-1.5-1.5+0.64+0.64=3.3==3.5 3Q14 6Q16 3m 5 4Q14 5.5m 5 1+0.35=3.45==3.5 5Q16/6 5 2Q18/5 5 7Q16/7 5 3Q14/6 2Q16/5 5.5-1.85-1.9+0.64+0. 5+0.4+0.35=5.75==6 0.7 4Q14/3 4Q14/6 6Q16/6 3Q14/3.5 B1 (1:100) Lower 2Q14/6 4Q14/6 6Q16/6 2Q14/7 5.5+0.15+0.4=6 0.8 6Q14/6 6Q16/6 2Q14/7 3.5 3.00 2.5 2.5 5.0 3.7 4.35 1.1 2.9 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 1.00 2.00 1.00 1.00 1.00 1.00 0.50 1.00 1.00 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 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 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 labor cost – – – • • • • • • • • Ceramic Floor: 2.9*2= 6m2 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= 30.9m2 12KD for blinding= 12KD 20KD*3days= 60KD Joint filling: 1*12KD skilled rate= 12KD Ceramic material cost= 3KD/m2 *37m2= 111KD Total Cost= 111+12+60+12= 195KD Plaster:= 31.6m2 Plaster material (fine aggregate) cost= 31.6*0.02*1.1= 0.7m2 *2KD= 1.4KD Plaster cement cost (1:3 means 10 cement bags per m3)= 7bags* 1.350= 9.450 Labor cost:2days*20KD=40KD Total cost= 1.4+9.5+ 40= 51KD