Chapter 13 Taking Off Quantities & BQ - Updated PDF
Chapter 13 Taking Off Quantities & BQ - Updated PDF
Chapter 13 Taking Off Quantities & BQ - Updated PDF
WEEK 13
1
Learning Outcomes
By the end of this session, students should be able to:
In the pricing of the forms all the above activities and the materials involved are allowed. It is the
surface area of the concrete, that is the contact area that will be measured. At the time of take-off, the
design of the forms does not have to be concerned since only the area of formwork is measured, thus,
the formwork shall be measured in square metre of contact area. For narrow strips of formwork, that
in less than 0.3 metre wide is normally measured in linear metre. It should be noted that the bulkheads
i.e. where wall is to be continued shall be measured separately. Also the forms to slab edges are
measured separately from forms to beams and forms to walls.
If in a form system there is an opening, and if the size of the opening is less than one square metre,
therefore no deduction is made from the total area of the forms.
Grooves, chases, chamfers in formwork that are linear in nature are measured in linear metre.
Forms to circular column are measured in linear metre to the height of the column and are described
by giving the diameter of the column.
Formwork
EXAMPLE OF CALCULATION FOR
CONCRETE WORK,
REINFORCEMENT & FORMWORK
FOR SLAB
SLAB
Prepare taking off sheet and bill of for the slab shown in figure below with the thickness
of slab 300 mm. The dimension sheet shall include concrete work (mass concrete for
slab) and reinforcement (bottom only). Concrete cover = 25mm.
T10-100
T12-200
SLAB – TAKE OFF SHEET
SLAB
Concrete Work
Mass concrete
4.3
3.5
0.3 4.52 m3
Say, 18 Say, 43
Item
Description Quantity Unit Rate RM
No.
Concrete Work
1 Mass concrete for slab, mix grade (to be
determine) 4.52 cu. m
Reinforcement
2 T 10, 160.18m (3.14 x 0.0052 x 160.18 x 7850)
98.71 Kg
Total Bill RM
SLAB
3500mm
4000mm
Formwork
1 Sawn timber of 38 mm thickness for side of slab 3.75 sq. m
2 Sawn timber of 38 mm thickness for soffit of slab 11.93 sq. m
Total Bill RM
EXAMPLE OF CALCULATION FOR
CONCRETE WORK,
REINFORCEMENT & FORMWORK
FOR BEAM
Beam
The following example illustrates the method of preparing a taking off sheet and BQ
for the reinforcement of the r.c beam (6 units) as shown in Figure 4.2.3.
2T12 2T18
Cross-Section Of Beam
BEAM Reinforcement (top) Stirrups
Reinforce 2T12
ment Length = 2.600
Add (+) column
(+) 2/1/2/0.125 375 R6
= 0.125
125
= 2.725
(-) Less (-) cover
2 x 0.025= 0.050 Length = 0.375
2.675 (-) Less (-) cover
Add (+) 2/0.025 = 0.050
bend (2 x 5.5d) 0.325
2 x 5.5 x 0.012 = 0.132
2.807 Length = 0.125
6 unit Say, 2.80 (-) Less (-) cover
12mm dia. m.s 2.0.025 = 0.050
0.075
6/2/ 2.80 33.60 33.60 m, T12 0.325 + 0.075 = 0.400
Total Bill RM
Example 3: CONCRETE WORK FOR BEAM
A B
2
EXAMPLE OF CALCULATION FOR
CONCRETE WORK,
REINFORCEMENT & FORMWORK
FOR COLUMN & FOUNDATION
Column And Foundation (Footing)
Drawing no. 4.2.4 is the plan footings and ground beams of a building. Drawing no.4.2.4.a
is the cross-section (Section Y-Y) for the footings. All drawings are not to scale.Based on
drawing no. 4.2.4 and 4.2.4.a, prepare the take off of quantities and BQ for:
(i) Excavation work including 150 mm of top soil for footing only.
(ii) Concrete work for stump (grade 1:2:4) and footing (grade 1:3:6).
(iii) Formwork
(iv) Reinforcement steel bar
Assumption:
1) Reinforcement :
(i) Lapping of 40d for steel bar from footing to column.
(ii) Length of bending for reinforcement shall be 5.5d.
(iii) Length of hook for link shall be 24d.
2) Cover of concrete :30 mm for footing
25 mm for other members
Cross Section X-X for beam
200mm
300mm
0.15
1.2
1.35 2.55m3
0.15
CONCRETE WORK
4/ 1.50
1.50
0.40 3.60 6.80 m3
4/ 0.20 1.850
0.20 0.250 - Ground beam
1.20 0.19 1.600
0.400 - Footing
2/ 0.25 1.200
0.25
1.20 0.15 0.34 m3
FORMWORK
Rough surface
4/4/ 1.50 formwork for footings
0.40 9.60
2/4/ 2.00
0.40 6.40 16.00 m2
Rough surface
4/4/ 1.20 formwork for side of stump
0.20 3.84
2/4/ 1.20
0.25 2.40 6.24 m2
Reinforcement For Footing
Reinforcement for
Footing 2000 x 2000 x 400
EXCAVATION WORK
1 Excavation of top soil, 150 mm 2.55 cu. m
2 Excavation of trench depth not exceeding 1.5 m 25.50 cu. m
3 Excavation of trench depth exceeding 1.5 m but not
4.25 cu. m
exceeding 3.0 m
CONCRETE WORK
4 Concrete grade 1:3:6 - 20 mm aggregate for footings 6.80 cu. m
5 Concrete grade 1:2:4 - 20 mm aggregate for stumps 0.34 cu. m
FORMWORK
6 Rough surface formwork for footings 16.00 Sq. m
7 Rough surface formwork for side of stump 6.24 Sq. m
REINFORCEMENT
8 Y16, 59.36+64.80+20.56=144.72m,
228.30 Kg.
(3.14x0.0082x144.72x7850)
9 Y12, 38.14m,
33.84 Kg.
(3.14x0.0062x38.14x7850)
10 R 6, 17.00+23.81= 40.81m, (3.14x0.0032x40.81x7850) 9.05 Kg.
(Density of steel bar, assume = 7850kg/m3)
Total Bill RM
Foundation
Based on drawing as shown in Figure 5.4.4 and Figure 5.4.4a, calculate the amount of formwork
required for the foundations, prepare taking off sheet and bill.
FOUNDATION
Sawn timber of
Sawn timber of 38 mm thickness
38 mm thickness to sides of
to sides of foundation
foundation
10/ 1.25
0.35 4.38 m2
6.30
3.85
4.38
4.55
1.96
2.98
24.02
Item
Description Quantity Unit Rate RM
No.
Formwork
Total Bill RM
ADDITIONAL NOTES
Retaining wall
Work example
Mass Concrete Of Retaining Wall.
Prepare taking off sheet and bill of quantities for mass concrete retaining wall with 30 m length as shown in figure below
(All measurement in mm)
1.8 m
CONCRETE WORK
Mass Concrete
(1 : 2 : 4) Concrete grade 15
- 20 mm aggregate for wall & piers
1.2
0.3 +
1.5
30.00
0.75 1.5/2 = 0.75
4.00 90.00
No. of piers
7/ 0.75 = 30/5 +1
0.30 =7
4.00 6.30
93.6 m3
Placing Of Concrete
Mass concrete for foundation
30.00
(thickness exceeding 500 mm)
2.40
0.90 64.80
m3
Mass concrete for wall
thickness 300 mm - 500 mm & piers
30.00
0.40 Average thickness of wall
0.89 10.68 0.3
0.5 +
0.8
0.8/2 = 0.40
1.40
7/ 0.75
0.30
0.89
12.08 m3
Mass concrete for wall
thickness exceeding 500 mm & piers
Average thickness of wall
0.5
1.2 +
1.7
1.7/2 = 0.85
30.00
0.85
3.11 79.31
7/ 0.75
0.30
3.11 4.90
84.21 m3
Concrete Ancillaries
Formwork to fair finish
(sloping surface)
Width = 4.0 0.9 4.1
2 2
30.00
4.10 123.00 m2
Formwork to rough finish
Vertical
Width of wall
30.00
7/0.75 = 5.25 – less piers
24.75
24.75 99.00 m2
4.00 Piers
Vertical width 0.4 – 1.22 m
7 0.75 21.00 m2
4.00 Piers
Vertical width 0.2 –0.4 m
7/2/ 0.30
4.00 16.80 m2
Inserts
100 clayware land drain fix in on rake
17/ 1 17 30/1.8 = 16.7, say 17 unit
24.75 Ashes in continuous pocket behind wall
0.60
0.45 6.68 m3
MASS CONCRETE RETAINING WALL - BILL OF QUANTITIES
Item
Description Quantity Unit Rate RM
No.
Mass Concrete
1 Concrete for foundation, mix grade C7.5 64.80 cu. m
2 Concrete for wall and piers, mix grade C 15 96.30 cu. m
Placing Concrete
3 Mass concrete for foundation 64.80 cu. m
4 Mass concrete for wall & piers, thickness 300 mm -
12.08 cu. m
500 mm
5 Mass concrete for wall & piers, thickness exceeding
84.21 cu. m
500 mm
Concrete Ancillaries
6 Formwork to fair finish 123.00 Sq. m
7 Formwork to rough finish, vertical width of wall 99.00 Sq. m
8 Formwork to rough finish, piers vertical width 0.4 –
21.00 Sq. m
1.22 m
9 Formwork to rough finish, piers vertical width 0.2 –
16.80 Sq. m
0.4 m
10 Inserts, 100 mm clayware land drain 17.0 No
11 Ashes in continuous pocket behind wall 6.68 cu. m
Total Bill RM
Concrete Road
The following example illustrates the method of preparing a taking-off sheet and bill of
quantities for the concrete road shown in Figure 4.2.5.
Item
Description Quantity Unit Rate RM
No.
1 Reinforced concrete, 180 mm thick in road 91.85 sq m
2 Waterproof paper 91.85 sq m
3 Expansion joint in road (180 mm deep) 9.20 lin m
4 Fabric reinforcement, 3 kg per sq m
275.55 Kg
5 Precast concrete kerb, 150 mm x 150 mm bedded and jointed
in cement mortar with concrete backing 34.30 lin m
Total Bill RM
CONCRETE ROAD Precast concrete kerb –
Reinforced concrete road 150 x 150 mm (including
180 mm thick concrete backing)
18.00 2/ 5.00
4.60 82.80 18.00
10.00
1.70
4.60 7.80 28.00 m
0.15 0.15 2/ 1/4//22
Deduct
2.00 2/ 0.5
2/ Less (-) kerb 0.30 10/ 0.5
1.70 2.466 24.66
1/4//
m
1.702/ 4.55 m2 Say 10 per joint
(20 mm bar
Waterproof paper = 2.466 kg/m)
(as above) Paving slabs
750 x 750 x 50
91.85 m2 bedded on sand
0.05m thick
Based on drawing as shown in Figure 5.4.2 and Figure 5.4.2a, calculate the amount of formwork
required for 5 nos. of square column. Prepare taking off sheet and bill of for the vertical column
and sloped column.
Item
Description Quantity Unit Rate RM
No.
Formwork
(23.20+55.10=78.30)
78.30 sq. m
Total Bill RM