QuantityTakeoff in engineering surverpdf

danieljacksoni2000 43 views 102 slides Jun 04, 2024
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About This Presentation

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Slide Content

Quantity Takeoff
Dr. Ahmed Elyamany
1

Outline
•Importance of Quantity Takeoff
•Preparation of Quantity Takeoff
•Measurement Units
•Measuring excavation, P.C footings, Beams,
Columns, slabs, and stairs.
•Solved Example
2

Quantity Takeoff
•Quantity takeoff is an activity performed by
General Contractors, Subcontractors, Cost
Consultants, and Quantity Surveyors as part
of the construction process.
•It involvescounting the number of items
associated with a particular construction
project
3

Quantity Survey at Project Stages
•Concept no quantity survey
•Design Engineering estimate
•Bidding / Tendering 
•Pre-bid estimate,
•Preconstruction estimate •Construction detailed estimate for incoive
4

Quantity Takeoff
•Quantity Takeoff is performed by:
•General Contractors,
•Subcontractors,
•Cost Consultants,
•Quantity Surveyors
5

Quantity Takeoff
•Counting the number of items associated
with a particular construction project
•Determining the associated materials and
labor costs
•Preparing an estimate as part of the bidding
process.
•Applied to the pricing process.
6

Quantity take-off: Why?
•Owner perspective:
•Initial estimate of the project costs at the
different stages of the project.
•Preparing the BOQ as a requirement of the
contract documents.
•Estimating the work done for issuing the
contractor payments.
7

Quantity take-off: Why?
•Contractor perspective:
•Pricing different work items.
•Identifying the needed resources (Labor,
Equipment, etc.).
•Project schedule.
•Preparing invoices for work done.
•Subcontractors’ payments.
•Review and control of crews’ production rates.
8

Quantity Takeoff
•The quantity takeoff process is typicallydone
manually using a printout, a pen, and a
calculator.
9

Quantity Takeoff
•New Trend is Building Information Modeling
(BIM)
•Provide a solution thatgenerates a set of
takeoff elements(counts, measurements,
conditions that affect cost) enables
estimators to more quickly and more
accurately perform takeoff for bidding or
pricing.
10

Quantity Takeoff
•Important to specify the type of ;
•Imported materials
•Suppliers
•Equipment
•Labors
•Work in project
•Important to know project budget
•Important to know activities logic
11

Quantity Takeoff Criteria
•It must be as accurate as possible
•Should be based on all available engineering
and design data.
•Use of appropriate automation tools is highly
recommended.
•The Quantity Takeoff is an important part of
the cost estimate.
12

Quantity Takeoff Input Documents
•Input from the client (task description).
•Conditions (general, special, supplementary).
•Drawing and specifications.
•Addenda.
•Agreement form.
•Modifications.
13

Quantity Development Guidelines
•Coordinate the quantity takeoff process and plan with
the estimator.
•Include a list of materials in quantity takeoffs.
•Utilize a process that easily records the quantity
•Check scales and dimensions on each drawing sheet.
•Highlight drawing areas where quantities have been
determined to ensure all elements is captured but not
double counted.
14

Quantity Development Guidelines
•Consider items that have no material but still
require cost, e.g., job office overhead, task
setup, training and certifications.
•Add a certain amount of waste, loss, drop off,
or length related to the material purchases
for a bulk order.
•Coordinate with designers if the design
appears in error..
15

Takeoff Sheet & Bill Of Quantities
•Quantity Takeoff Sheet
•تايمك تاسياقم
•Estimated Quantities
•ةيريدقت لامعأ تاسياقم
•Actual Quantities •ةيلعف لامعأ تاسياقم
•Bill Of Quantities (BOQ)
•ةينيمثت تاسياقم
16

Quantity Takeoff Sheet
17
Total
PartDimension
QuantityUnitItemItem
AdditionSubtractionHeightWidthLength
1
2
3
4
.

Bill Of Quantities
18
NotesPrice
QuantityUnitItemItem
TotalUnit
1
2
3

Bill of Quantities classification
•The Bill of Quantities is classified into the
following work groups:
•Civil works
•Sanitary works
•Electrical works
•Mechanical works
19

Bill of Quantities classification
•Civil works:
•Earth works:
•leveling,
•excavation,
•backfilling,
•transportation of excavated soil)
•Foundation works:
•plain concrete
•reinforced concrete
•piling foundations
20

Bill of Quantities classification
•Civil works:
•Skelton reinforce concrete:
•Columns,
•Beans,
•Slabs
•Stairs
•Brick works:
•Internal brick work
•External brick work
21

Bill of Quantities classification
•Civil works:
•Finishing:
•Water proofing
•Staircases
•Plastering
•Flooring
•Painting
•Metal works:
•Windows
•Doors
•Accessories
22

Bill of Quantities classification
•Sanitary works:
•Water feeding systems
•Internal and external plumbing works
•Finishes of plumbing works
•Electrical works:
•Electrical cables
•Wiring; Accessories
•Internal connections
•Mechanical works:
•Air conditioning systems
•Elevators
23

Work order
•Items in takeoff sheets are organized in the
same construction sequence.
•Order of items in the same chapter:
•Items estimated in (m3)
•Items estimated in (m2)
•Items estimated in (m)
•Items estimated in (unit)
•Items estimated in (ton)
•Items estimated in (L.S.)
24

Measuring Units
•The units of measurements for civil
engineering worksare mainly categorized for
their:
•Nature
•Shape
•Size and
•Payments to the contractor.
•There are a number of standard codes and
methods of measurement that are available.
25

Measuring Units
Cubic meter (m
3
)
•Used for items such as:
•Excavation
•Backfilling
•Concrete
•Brick walls (≥25 cm thick)
Square meter (m2)
•Used for items such as:
•Brick walls (<25 cm thick)
•Plastering
•Flooring
•Painting
26

Measuring Units
Linear meter (m)
•Used for items such as:
•Pipe lines
•Canals
•Stair steps
•Windows sills
Number (unit)
•Used for items such as:
•Electric outlets
•Doors and windows
•Sanitary fixtures
•Precast concrete
27

Measuring Units
Lump sum(L.S.)
•Item is subcontracted when the contractor
does not have enough experience to
construct it or there is an item which has a
small quantities of many work items such as:
•Manholes
•Lifts
•Some electrical and plumbing works
•Weight (Ton):
•Metallic works
•Reinforcement steel
28

Preparation of Quantity Takeoff
•Check the availability of drawings
•Check the axis and dimensions
•Check building levelsand link it to structural
drawings.
•Check doors and windows modelnumbers
•Check ground waterlevels
29

Preparation of Quantity Takeoff
•Check architecturalagainst structural
drawings
•Check foundation design and foundation
levels
•Check construction members dimensionand
reinforcement.
•Review the contract conditions and
specifications
30

Formulas
31
Square
Rectangle
Parallelogram
Trapezoid
Trapezium

Formulas
32
Triangles
Regular Polygons
Circle
Parabola
Ellipse

Formulas
33

Formulas
34

Formulas
35

Formulas
36

Formulas
37

Formulas
38

TakingoffItems
39

Earth works
Excavation
•Quantities are calculated based on the
dimensions of the foundation in plans from the
owner perspective.
•Contractors should consider the excess of
material excavated to all for safe operations.
•Prices differ based on the soil type, deep of
excavation, ground water level, site location,
shoring system, Equipment used, etc.
•Unit of measurement m3 (volume).
40

Earth works
Excavation: Example
•Calculate the volume of Excavation for each
of the following cases:
41
1.80
1.20
1.40

Earth works
Excavation: Example
42
1.80
0.75 1.20
1.40
0.75
1.0
1.0

Earth works
Excavation: Example
43
1.80
0.75 1.20
1.40
0.75
1.0
1.0

Earth works
Excavation: Example
44
1.80
1.20
20 m
10 m

Earth works
Excavation: Example
45
20 m
1.80
1.20

Earth works
Excavation: Example
46

Earth works
Excavation: Example
•The length of excavation = 5.4 ×2 + (4.4 –2) ×2 = 15.6 m
•Depth of excavation = 1.8 m
•Width of excavation = width of plain concrete footing = 1.0 m
•Volume = 15.6 ×1.8 ×1.0 = 18.8 m3
47

Earth works
Backfilling
•Unit of measurement is m3 (volume)
•Volume of backfilling = excavation –concrete –brick
48

Earth works
Backfilling: Example
•Consider the previous example, the volume
of backfilling could be calculated as follow:
•Volume of concrete = 15.6 ×1 ×0.4 = 6.24m3
•Volume of brick = 15.6 ×0.4 ×1.4 = 8.736m3
•Volume of backfilling = 18.8 –(6.24 + 8.736) =
3.824m3
49

Earth works
Site leveling
•Top soil cannot be used for backfilling as it
would, over time, cause damage to the
substructure.
•The usual default depth for topsoil is 15 cm
•Measured in m2 (area) if thickness < 30cm.
•Measured in m3 (volume) if thickness >
30cm.
50

Earth works
Site leveling: Example 1
•Figure below is a 5 m grid of a survey of levels
taken on a site.
•The site is required to be reduced to a level of
35.62 and in order to calculate the volume of
excavation required the average level of the
site must be determined.
51

Earth works
Site leveling: Example 1
•This can be easily done by weighting the
levels as follows starting at the top left-hand
corner of the site (35.90) and working from
left to right.
52

Earth works
Site leveling: Example 1
Level Total Level
35.90 35.90
35.86 ×2 71.72
35.89 ×2 71.78
35.92 ×2 71.84
35.90 ×2 71.80
35.89 35.89
35 86 ×2 71.72
35.84 ×4 143.36
35.88 ×4 143.52
35.90 ×4 143.60
35.90 ×4 143.60
35.86 ×2 71.72
35.84 35.84
35.85 ×2 71.70
35.87 ×2 71.74
35.90 ×2 71.80
35.88 ×2 71.76
35.78 35.78
Total 1435.07
53
Number of Points = 40
Average site level =
1435.07 / 40 = 35.87
Reduced level = 35.62
Average Excavation
depth= 35.87 -35.62 =
0.25

Earth works
Soil transportation
•Transported soil = Vol. of exc. –Vol. of
backfilling + additional soil at site
•Add swelling factor based on the soil type:
•5% sandy soil.
•15% clayey soil and
•25% for demolition material. (owner or
contractor)
54

Concrete works
Plain concrete (PC)
•Measured in m2(area) if thickness < 20 cm.
•Measured in m3(volume) if thickness ≥ 20
cm.
•Average thickness should be mentioned
when measurement is done by area.
55

Concrete works
Reinforced concrete (RC)
•All RC elements measured by volume (m3)
excepthollow block slabs and Domes,
cylindrical roofs and shells.
•Hollow blockslabs measured by area (m2).
•Domes, cylindrical roofs and shells measured
by area in the horizontal projection (m2).
56

Concrete works
Plain Concrete Footing
•Quantity of P.C footing = No. of footings for a
specific model * length * width * depth
•Total quantity of P.C footings = summation of
P.C footing models
57
PC Footing
RC Footing

Concrete works
Ground Beams
•Quantity of ground beam = No. of ground
beams for a specific model * length * width *
depth
•Total quantity of ground beams = summation
of ground beam models
58
PC Footing
RC Footing
Ground Beam

Concrete works
Columns
•Quantity of columns = No. of columns for a
specific model * length * width * height
•Total quantity of columns = summation of
columns models
59
PC Footing
RC Footing
Columns

Concrete works
Slabs
•Solid slabs:
•Quantity of slab = length * width * thickness
•Flat slab:
•Quantity of slab = length * width * thickness
•Beams:
•Quantity of beam = length * width * height
60

Concrete works
Stairs
•Quantity of stairs = (thickness + riser/2 )*
tread * width * No. of stairs
61
tread
riser
thickness
thickness

Solved Example
62

Example
(Unit price Contract)
63
15cm
7ɸ10/m
7ɸ12/m4.8m
5.6m
ك1
ك2
ك2
ك1
ع1
ع1 ع1
ع1
AA

Example
(Unit price Contract)
64
تﻼمسلا عاطق0.3m x 0.5m
ع دومعلا عاطق1 0.3m x 0.3m
ع دومعلا عافترا1 3.0m
ةحلسملا دعاوقلا1m x 1m x 0.4m
ةيداعلا دعاوقلا1.6m x 1.6m x 0.15m
ك تارمكلا عاطق1,ك2 0.3m x 0.5m
2ɸ16 يولع+4ɸ16 تاناكلا و لدع يلفس6ɸ8/m يناسرخلا ءاطغلا
2.5 مس
ةيعيبطلا ضرﻷا بوسنم
1.05 m
Section A-A

Example
(Unit price Contract)
•It is required to make an engineering
estimate to the quantities of the following
items:
•Excavation (as isolated footing)
•Plain Concrete Footings
•Reinforced Concrete Ground Beams
•Filling
•Columns concrete
•Slab and beams Concrete
•Slab and beams Reinforcement
65

Example
(Unit price Contract)
66
.15 m
.15 m5.6 m
5.3
1.6 m
0.8 m
3.7 m
1.6 m
1.6 m
1.05 m
4.8 m

Example
(Unit price Contract)
67
No.Item UnitNumberLengthWidthDepthTotal
1Excavation m3 41.61.61.0510.752
23.70.30.51.11
22.90.30.50.87

Example
(Unit price Contract)
68
No.Item UnitNumberLengthWidthDepthTotal
2PC Concrete m2 41.61.6 10.24
1.6 m
1.6 m
0.15 m

Example
(Unit price Contract)
69
No.Item UnitNumberLengthWidthDepthTotal
3RC Concrete m3 4110.41.6
1.0 m
1.0 m
0.4 m

Example
(Unit price Contract)
70
No.Item UnitNumberLengthWidthDepthTotal
4Ground Beamsm3 25.30.30.51.59
24.50.30.51.35
0.15 m
5.6 m
5.3
0.3 m
تﻼمسلا
0.5 m
4.8 m
4.5 m
0.3 m
0.15 m

Example
(Unit price Contract)
71
No.Item UnitNumberLengthWidthDepthSubtotalTotal
1Excavation m3 12.732
2PC Concrete m3 1.536
3RC Concrete m3 1.60
4Ground Beamsm3 2.94
Total Concretem3 6.07
5Filling m3 6.66

Example
(Unit price Contract)
72
No.Item UnitNumberLengthWidthDepthTotal
2PC Slab on Grade m215.04.2 21
5.6 m4.8 m
5.0 m
4.2 m

Example
(Unit price Contract)
73
No.Item UnitNumberLengthWidthDepthTotal
6Columns Concretem3 40.30.331.08
ةدمعﻻا
3.0 m
3.0 m
3.0 m

Example
(Unit price Contract)
74
No.Item UnitNumberLengthWidthDepthTotal
7Slab & Beamsm3 25.30.30.51.59
24.50.30.51.35
154.20.153.15
0.15 m
5.6 m
5.3
4.8 m
4.5 m
0.15 m
0.5 m
0.3 m
5.0 m
4.2 m
0.15 m
15
cm

Example
(Unit price Contract)
75
No.Item UnitNumberLengthWidthDepthTotal
1Excavation m3 12.732
2PC Concrete footingm2 10.24
3RC Concrete footingm3 1.60
4Ground Beamsm3 2.94
5PCSlab-on-gradem2 21.00
6Filling m3 6.66
7Columns Concretem3 1.08
8Slab & Beamsm3 6.09
Take-off Summary Table

Example
(Unit price Contract)
76
No.Item UnitQuantityUnit priceTotal priceNotes
1Excavation m3
13.0
2Filling m3
7.0
3PC Concrete footingm2
10.0
4RC Concrete footing
and Ground Beams
m3
5.0
5Columns Concretem3
1.0
6PCSlab-on-gradem2
21.0
7Slab & Beamsm3
6.0
Bill of Quantities

Example
(Lump Sum Contract)
•It is required to make a contractor estimate to the
quantities of the following items:
•Excavation (excavated as raft, soil swelling factor =1.2,
earth slop 1:1.5 and are increased by 1 m from all sides,
excavated soil is to be transported outside site)
•Plain Concrete Footings
•Reinforced Concrete Footings
•Ground Beams concrete
•Filling (shrinkage factor =0.85, new fill soil to be brought
from outside site)
•Columns concrete
•Slab and beams Concrete
•Slab and beams Reinforcement
77

Example
(Lump Sum Contract)
78
8.9
8.1
0.15 0.155.6 m
5.30.8
4.8
0.81.01.0
8.9
1
1.5
8.91.575
1.05
1.575
12.05
8.1
1
1.5
8.11.575
1.05
1.575
11.25

Example
(Lump Sum Contract)
79
8.9
1
1.5
8.91.575
1.05
1.575
12.05
8.1
1
1.5
8.11.575
1.05
1.575
11.25
Base 2 =12.05 x 11.25 = 135.5625
Base 1=8.9x8.1= 72.09
Excavation Vol. = 1.05 *(135.563+72.09)/2 = 109
Transported Soil Volume = 109 x 1.2 = 130.8 m3
#ItemUnitNumberLengthWidthDepthTotal
1Excavationm31 109

Example
(Lump Sum Contract)
80
No.Item UnitNumberLengthWidthDepthTotal
2PC Concrete foundationm3 41.61.60.151.536
1.6 m
1.6 m
0.15 m
Quantity of concrete needed = 1.536 x 1.05 = 1.6 m3

Example
(Lump Sum Contract)
81
No.Item UnitNumberLengthWidthDepthTotal
3RC Concrete m3 4110.41.6
1.0 m
1.0 m
0.4 m
Quantity of concrete needed = 1. 6 x 1.05 = 1.68 m3

Example
(Lump Sum Contract)
82
No.Item UnitNumberLengthWidthDepthTotal
4Ground Beamsm3 25.30.30.51.59
24.50.30.51.35
تﻼمسلا
0.5 m
0.3 m
Quantity of concrete needed = 2.94 x 1.05 = 3.1 m3

Example
83
No.Item UnitNumberLengthWidthDepthSubtotalTotal
1Excavation m3 109
2PC Concrete m3 1.536
3RC Concrete m3 1.60
4Ground Beamsm3 2.94
Total Concretem3 6.06
5Filling m3 102.9

Example
(Lump Sum Contract)
84
No.Item UnitNumberLengthWidthDepthTotal
2PC Slab on Grade m315.04.20.153.15
Quantity of concrete needed = 3.15 x 1.05 = 3.3 m3
5.6 m4.8 m
5.0 m
4.2 m

Example
(Lump Sum Contract)
85
No.Item UnitNumberLengthWidthDepthTotal
6Columns Concretem3 40.30.331.08
ةدمعﻻا
3.0 m
3.0 m
3.0 m

Example
(Lump Sum Contract)
86
No.Item UnitNumberLengthWidthDepthTotal
7Slab & Beamsm3 25.30.30.51.59
24.50.30.51.35
154.20.153.15
0.15 m
5.6 m
5.3
4.8 m
4.5 m
0.15 m
0.5 m
0.3 m
5.0 m
4.2 m
0.15 m
15
cm

Example
(Lump Sum Contract)
87
No.Item UnitNumberLengthWidthDepthTotal
1Excavation m3 109
2PC Concrete footingm3 1.536
3RC Concrete footingm3 1.60
4Ground Beamsm3 2.94
5PCSlab-on-gradem3 3.15
6Filling m3 102.9
7Columns Concretem3 1.08
8Slab & Beamsm3 6.09
Take-off Summary Table

Example
(Lump Sum Contract)
88
ك تارمكلا عاطق1,ك2 0.3m x 0.5m
2ɸ16 يولع+4ɸ16 تاناكلا و لدع يلفس6ɸ8/m يناسرخلا ءاطغلا2.5 مس
7ɸ10/m
7ɸ12/m
2.5cm
30cm
25cm
2.5cm
50cm
Reinforcement Takeoff
4.8m
5.6m

Example
(Lump Sum Contract)
89
Unit
(kg)
No. of
bars
LengthTotal
length
Unit
Weight
Total
Weight
16 upper (beams) 44.819.21.6331.296
45.622.41.6336.512
16 lower (beams) 84.838.41.6362.592
85.644.81.6373.024
10 long (Slab) 345.6190.40.63119.952
12 short (Slab) 404.81920.92176.640
8 stirrup (beams) 601.55930.4138.130
511.5579.050.4132.411
TotalSteel 570.557
Reinforcement Takeoff

Taking off Finishing Items
90

Brick works
•Measured in m2(by area) if thickness <25 cm.
•Measured in m3(by volume) if thickness ≥25cm.
•Deduct allopenings with area >0.5 m2.
•Include openings with area <0.5 m2.
•Deduct halfthe area (volume) of arches.
•Deduct allConcrete elements.
•Separate item for each brick type
91

Finishing works
Plastering
•Internal Plaster:
•Engineering measurement by area (m2).
•All openings with area ≥ 1 m2 are deducted.
•Openings with area < 1 m2 are not deducted.
•Openings sides are not added.
•Inclined slabs are calculated based on their
horizontal projection.
92

Finishing works
Plastering
•External plaster:
•Engineering measurement by area (m2).
•Openings with areas ≥ 1 m2 are deducted.
•Openings with areas < 1 m2 are not deducted.
•Openings sides are not added.
•Cantilever slabs < 1 m projection not added.
•Add half the area of cantilever slabs ≥ 1 m.
93

Finishing works
Wall covering
•Engineering measurement by area (m2).
•Ceramic
•Granite
•Wood
•Brick
•Stone
•Wall trim measured in linear m
•Circular columns measured in linear m
94

Finishing works
Stair steps covering
•Engineering measurement by linear m.
•May be measured by unitof steps.
95

Finishing works
Flooring
•Engineering measurement by area (m2).
•Floor Trim ( ةرزو)

20cm measured in (m
2
)
•Floor Trim ) ةرزو( < 20cm measured in (m)
•Types are:
•Tiles
•Ceramic
•Granite
•Wood
96

Finishing works
Painting
•Engineering measurement by area (m2).
•All openings are deducted.
•Openings sides are added.
•Wood painting measured by unit.
97

Finishing works
Water Proofing
•Engineering measurement by area (m2).
•Footings Isolation
•Column neck Isolation
•Ground beam Isolation
•Bathroom Isolation
•Roof slab Isolation
98

Finishing works
Example
99
4.8m
5.6m
W1
D1
AA
W2
D2
1.1 m
1.8 m

Finishing works
Example
100
0.00 m
Section A-A
0.25 m
3.5 m
0.15 m
3.00 m
Brick wall 0.25 m thick
-Top slab Beam 0.3m x 0.5m
-Column 0.3m x 0.3m
-External Brick wall = 25 cm thick
-Internal brick wall = 12.5 cm thick
-Top roof wall = 12.5 cm thick
-W1: Window 1.2x1.2, sill height = 1.2 m
-W2: Window 0.5x0.5, sill height = 2.0 m
-D1: Door 1.0x2.2 m
-D2: Door 0.8x2.2 m
-Slab-on-grade thick = 0.15m
-Room Internal plastering = 2 cm thick
-Bathroom Internal finishing is ceramic tiles
-External plastering = 2 cm thick
-Flooring is ceramic tile thick = 1 cm
-Mortarand Sand layersbelow ceramic = 2
and 7 cm thick respectively.
-Moisture isolation above Slab-on-grade.
-Moisture isolation above roof slab
-Mortar and Sand layers below roof tiles = 2
and 7 cm thick respectively.
-Roof tiles = 2 cm thick
1.05 m
0.15 m

Finishing works
Example
It is required to estimate the quantities of
the following work items:
•Internal brick work
•External brick work
•Plastering
•Isolation
•Ceramic wall
•Ceramic flooring
•Painting
•Doors and window
101

Thank You
102