Part1 QuanT. Estim. FINAL
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Transcript of Part1 QuanT. Estim. FINAL
Specification & Quantities Estimating
Lecturer Eng: Eyad A. Haddad
College of Applied Engineering& Urban Planning
Eng: Eyad Haddad
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Course Aims & ObjectivesAt the completion of this course, the student will: Recognize the preliminary and detailed estimating methods and focusing on the elements for construction projects To be familiar with cost analysis and preparation for bidding. Understanding and be familiar with the construction specification in particular for building.
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Course OutlinePart 1 : Quantity Survey Introduction to Engineering project including project cycle, & bidding documents. Quantities surveying and calculation of different areas. Methods of measurement of the works. Pricing & cost analysis. Payment certificate. Application on Engineering project
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Part 2 : Technical specification
Earth works Concrete works Masonry works Plastering Tiling Metal work Carpentry work Painting works Glazing Plumbing works Electrical worksEng: Eyad Haddad 4
The Engineering ProjectProject
Mechanical Works
Electrical Works
Structural works
Architectural Works
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Types of construction Engineering Projects :- Building construction - Roads Construction - Water Systems - Sewerage and Storm water systems
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Project CycleStudies, design, tendering
Taking- over, and operation
Implementation & supervision
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Main stages in construction project1- Concept : identify the project needs, and objectives 2- technical studies as feasibility study, possibility of implementation, primary cost, and possibility of financing ..etc. 3- Preliminary design 4- Detailed design including architectural , structural, electrical, mechanical. 5- Tender documents. 6 Tendering 7- Contract Award 8- contract agreement 9- starting construction 10- Preliminary handing over the project 11- the operation of the project 12- maintenance period 13- Project final handing over.Eng: Eyad Haddad 8
Construction Project CycleFull Operations
Percent Complete
Installation Substantially Com plete
Major Contracts Let
Project "GO" Decision
Stage IF e a s a bilit y - P ro ject Fo rmulatio n - Feasabiltiy Studies - Strategies Design & A ppro val
Stage IIP la nning & D e s ign - B ase Design - Co st & Schedule - Co ntract Terms & Co nditio ns. - Detailed P lanning
Stage IIIC o ns t ruc t io n - M anufacturing - Delivery - Civil Wo rk - Installatio n - Testing
Stage IVT urno v e r & S t a rt Up - Final Testing - M aintenance
Figure 1.1 : Construction Projects Life-Cycle (Ref: PMBK, 2000)Eng: Eyad Haddad 9
Tender Documents
Invitation to bid Instruction to bidders Information to bidders & bid data Biding Forms General conditions of contract Specific condition of contract Specification BOQ Drawings Contract forms
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The Project Parties The Employer /Owner The consultant: who appointed by the
employer to do the design and bidding documents and supervise the construction work. The contractor: who was approved by the employer to implement the works according to the submitted bid.Eng: Eyad Haddad 11
Other Parties Municipalities, ministries, suppliers, technicians Subcontracts, workers,
Insurance companies Banks and other financing agencies.
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Construction Project TeamsMain tasks for engineering teams in the project are :- design - Implementation / construction - supervision
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Construction Project Teams
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Quantity Surveyor He the person who is responsible on estimating
the quantities from the design drawings, and measurement of the quantities in the site during the project implementation, and preparing the current and final payments.
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Quantity Surveys (take off)It is the quantity of works/material take off , required for the completion of project implementation, and listed as items in table of quantities. In general we can describe quantity survey as follows: 1. Description and preparation of the bill of quantities and its items required for the tender. 2. Preparation of the site material, material types, and material distribution.Eng: Eyad Haddad 16
Quantity surveys (take off) .. Cont.
Describe the items and preparing BOQ Preparing of the cost estimate in BOQ.
Preparation of the list of the site needs (technician / workers) Preparation of the due payment statements (contractor
payments during the construction)
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Tasks of the Quantity SurveyorFirst : in the consultant office : Stage 1 :During the preparation of bidding documents : - Preparation of the BOQ from the design drawing which part of bidding documents. - Preparation of cost estimate for items listed in BOQ - Review and check the bids submitted from bidders. - Preparation of the lists of the contents of bids received. - Sharing in evaluation and preparation of t recommendation to award the contract to be submitted to owner.Eng: Eyad Haddad 18
Quantity Surveyor Tasks2
Stage 2 : During the supervision of the constructionReview and checking the payments submitted from the contractor. Preparation of the reports about the conformity of the quantities items with contract documents.
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Second : In the Contractor Company- During the implementation :- Review and checking the BOQ at the starting of the work. - Prepare the eng. Measurement for the quantities of the finished
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works. Prepare lists of the site needs (material, workers, technicians) Calculate the remuneration of the subcontractors, workers, equipments,etc. Prepare the payment statements Prepare the detailed reports describing the situation of the items quantities, (plus or minus the contract BOQ)
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Required Skills Ability to understand the drawings details, design
drawings, shop drawings, as built ). Excellent knowledge of the calculation of the areas and volumes, knowledge of fees of workers e /technicians/ , rules and law of the contracts, In addition to the knowledge of related financial issues/ taxes, banks transactions, insurances and its implication. Knowledge of the productivity of the workers and technicians.
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Stages of the Quantity Survey Stage1 : preparation of the engineering measurement and calculations of the works during the preparation of the bidding documents (consultant) and- preparation of the measurement of the accomplished
works in the site and prepare the payment (contractor) Stage 2 : preparing BOQ Stage 3 : review and check the financial payments.
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Areas, Volumes, & Surface areas
See attached PDF file
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Next Lecture : Special calculations of the areas and volumes. Measurement of the works.
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Lecture # 3
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Method of measurements1- Conventional measurement () Depends on experience, and type of project. Doesn't govern by theories or engineering basics.
Not considered as scientific method. Doesn't subtract the opening as windows or doors from
the block, plastering, painting works and computing whole wall. Another example : as the every 3 steps in stair = 1 m3Eng: measurement () 2- Engineering Eyad Haddad 37
Cont.unit Lump-sum (L.S) M.R No. M2 M3 Ton / kg Day / hrs measurement Works have details difficult to be calculated Works have specific length and width Works have 3 dim. fixed Works with specific thickness, Variable dimensions Have specific width Labor / equipmentEng: Eyad Haddad
example Earth work, earthling system (electrical),, As pipes Windows, doors, as plastering, painting, Footings, columns, stairs, As steel Workers wages, equipment,38
Types of construction works Building construction Roads construction Water Booster P.S and piping, Sewage and storm water P.S and piping. Electrical construction
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Preparation of engineering measurements measurement sheet
project name _________________ contractor name ____________ engineer name _______________Dimension width heigth
SN
Description
Unit
Quantity length
Unit rate Total amount
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Act. No. 0100 0101 0200 0201 0203 0300 0301 0302 General Works Demolition Works Earth Work Excavation
Activity Description
Unit l.s m3 m3 m3 m3
Fill with compacted clean sand Concrete Works Plain concrete B150 R. Concrete B300 for foundation
03030304 0305
R. Concrete B250 for Ground beams and stepsR. Concrete B300 for Necks and Columns R. Concrete B250 for Slaps 25 cm thick.
m3m3 m3 m2 m2
04000401 0402
Block WorksBlock works for walls 20cm thick. Block works for internal walls 15cm thick.
04030500 0501 0502 0600
Block works for internal walls 10cm thick.Plastering Works 3-face internal plastering External plastering on walls Tilling Works Eng: Eyad Haddad
m2m2 m241
Measurement of works / Earth WorkItem Site leveling unit Lump sum Method of measurement It takes into consideration all site leveling including the excavation, fill, till reach 0+B.M according to design drawing. Measured by 2 methods : 1- footings areas according to blinding area * depth of excavation according to drawings. 2- external dimensions of the building *depth of footings = excavation concrete work for footings and columns under ground level.
Excavation (cut)
m3
Fill (backfill)
m3
= ground plan *depth of ground beams (concrete for ground beams and ground floors)
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Example : Measurement of Earth Work / Excavation worksMeasured by 2 methods : 1- footings areas according to blinding area * depth of excavation according to drawings. 2- external dimensions of the building *depth of footings
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Measurement of works / concrete works Concrete works measures engineering
measurement All opening more than 0.1m2 or 0.1 m3 are
deducted. The concrete works more than the areas, volumes
in the drawings doesnt included.Eng: Eyad Haddad 44
Measurement of works / concrete worksItem unit Method of measurement = length * width (the thickness should be specified in the drawings and specifications) Blinding m2 concrete, ground concrete, benching, and slabs concrete with fixed thickness
Ribs blocks dont subtract from the slabs concrete.
Footings, m3 columns, ground beams, stairs, and canopies, Concrete decoration works as curves. No.
= length*width*thickness -Ground beams are measured from its connection with columns - concrete stars include the stairs , steps, stair slabs, walls supporting the stairs. The dimensions must be specified in the drawings.
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Measurement of works / block worksItem Block works unit m2 Method of measurement = length * width (the thickness should be specified in the drawings and specifications) - subtracting all openings more than 0.1 cm2.
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Measurement of works / Plastering/ painting worksItem Length * width unit M2 Method of measurement = length * width (engineering measurement after subtracting the openings, more than 0.1 m2) - the area is measured above the skirting (terrazzo chips) Internal plastering = walls + slabs
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Measurement of works / tilling worksItem Terrazzo, marble, ceramic unit m2 Method of measurement = length * width (engineering measurement)
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Measurement of works / Plastering/ painting worksItem Plastering & painting unit M2 Method of measurement = length * width (engineering measurement after subtracting the openings, more than 0.1 m2) - the area is measured above the skirting (terrazzo chips) Internal plastering = walls + ceiling
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Measurement of works / DoorsItem Doors unit No. Method of measurement The exact dimensions should be specified in the design drawings. Sometimes carpentry works measured in m2 or m length according to the item described in BOQ.
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Measurement of works / WindowsItem windows unit No. Method of measurement The exact dimensions should be specified in the design drawings. Sometimes carpentry works measured in m2 or m length according to the item described in BOQ.
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Measurement of works / electrical & sanitary worksItem Electrical and sanitary pieces / accessories unit No. Method of measurement The dimensions should be specified clearly in the design drawings as the sockets, lamps, fluorescent lighting,etc (W.C. , washing basins, sinks, manholes, pumpsetc) The dimension and details should be specified in the drawings, as (cables, pipes, ..etc)
piping
M.R
Works with special detail
Lumps sum
All details should be specified in the drawings, as earthing, gas network,
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Bill of Quantities The results in the quantities book, are recorded in the BOQ table. It is preferable to add 5-10% percentage on the quantities for
contingency to avoid any errors or any..
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Lecture # 4
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Example 1Estimate the quantities and prepare bill of quantities for the following works:Concrete for columns. Concrete for footings. Plastering, painting and tilting for guest room Tiling and plastering for bathroom 1, provided that the tiles will cover all the walls. Knowing that, Height of the floor is 2.95m The windows for guest room are150x120cm, 300x120cm, and the doors are 220x90 cm and 220x120 cm Bathroom1 door is 220x70 cm, and the window is 80x80cm Depth of excavation is 1.2 m Dimension of ground beams is 20x50 cm. Thickness of Blinding concrete is 10 cm and increase 10 cm in each direction. Dimension for columns and footings described in the following table:Eng: Eyad Haddad 55
Column number/ Description Columns Dimension
1,2,3,4,5,6, 7,8,9,10, 12,13, 18,19,20 20*50
11,14,15,16,17, 20*60
Columns neck DimensionFootings Dimension
25*50150*150*50 cm
25*60160*160*50
C1
C2
C3 Bedroom -3-
C4
C5
Kitchen
Guest room
C20 C19 C14 C15
C6
C16
C17
C18
Bathroom1 C7
living room
Bathroom
Bedroom -2-
Bedroom -1-
C13
C12
C11
C10
C9
C8
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Dimensions S. N Item description Unit Quant. L W H
Total Quantities Partially Positive + Negative Total
C1
C2
C3 Bedroom -3-
C4
C5
Column number/ Description Columns Dimension
1,2,3,4,5,6, 7,8,9,10, 12,13, 18,19,20 20*50 25*50 150*150*50 cm
Kitchen
Guest room
11,14,15,16,17,C20 C19 C15 C6 C14
20*60 25*60
Columns neck DimensionFootings Dimension
C16
C17
C18
Bathroom1 C7
living room
Bathroom
160*160*50
Bedroom -2-
Bedroom -1-
C13
C12
C11
C10
C9
C8
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Example 2 :Estimate the quantities and prepare bill of quantities for the following works:Dimensions S. N Item description Unit Quant. L W H Total Quantities Partially Positive + Negative Total
T1 T1 T1 T1
T2 T1 T2 T1 T1 T1
T2 T1 T2 T1 T2 T1 T1 T258
T1 T2 T3Eng: Eyad Haddad
T1
T1 T2
T1 T1
Example 3 :Estimate the quantities and prepare bill of quantities for the following works:Dimensions S. N Item description Unit Quant. Total Quantities Partially Positive +
L
W
H
Negative
Total
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Example 4 :Estimate the quantities and prepare bill of quantities for the following works:Dimensions S. N Item description Unit Quant. Total Quantities Partially Positive +
L
W
H
Negative
Total
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Example 5 :Estimate the quantities and prepare bill of quantities for the following works:Dimensions S. N Item description Unit Quant. Total Quantities Partially Positive +
L
W
H
Negative
Total
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Example 4 :Estimate the quantities and prepare bill of quantities for the following works:Dimensions S. N Item description Unit Quant. Total Quantities Partially Positive +
L
W
H
Negative
Total
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Measurement of works / Earth WorkItem Site leveling unit Lump sum Method of measurement It takes into consideration all site leveling including the excavation, fill, till reach 0+B.M according to design drawing. Measured by 2 methods : 1- footings areas according to blinding area * depth of excavation according to drawings. 2- external dimensions of the building *depth of footings = excavation concrete work for footings and columns under ground level. = ground plan *depth of ground beams (concrete for ground beams and ground floors)
Excavation (cut)
m3
Fill (backfill)
m3
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Measurement of works / concrete works Concrete works measures engineering measurement All openinng more than 0.1m2 or 0.1 m3 are
deducted. The concrete works more than the areas, volumes in the drawings doesnt included.
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Measurement of works / concrete worksItem Blinding concrete, ground concrete, benching, and slabs concrete with fixed thickness Footings, columns, ground beams, stairs, and canopies, unit m2 Method of measurement = length * width (the thickness should be specified in the drawings and specifications) Ribs blocks dont subtract from the slabs concrete.
m3
= length*width*thickness -Ground beams are measured from its connection with columns - concrete stars include the stairs , steps, stair slabs, walls supporting the stairs. The dimensions must be specified in the drawings.
Concrete decoration works as curves.
No.
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Measurement of works / block worksItem Block works unit m2 Method of measurement = length * width (the thickness should be specified in the drawings and specifications) - subtracting all openings more than 0.1 cm2.
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Measurement of works / Plastering/ painting worksItem Length * width unit M2 Method of measurement = length * width (engineering measurement after subtracting the openings, more than 0.1 m2) - the area is measured above the skirting (terrazzo chips) Internal plastering = walls + slabs
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Measurement of works / tilling worksItem Terrazzo, marble, ceramic unit m2 Method of measurement = length * width (engineering measurement)
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Measurement of works / Plastering/ painting worksItem Plastering & painting unit M2 Method of measurement = length * width (engineering measurement after subtracting the openings, more than 0.1 m2) - the area is measured above the skirting (terrazzo chips) Internal plastering = walls + ceiling
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Measurement of works / DoorsItem Doors unit No. Method of measurement The exact dimensions should be specified in the design drawings. Sometimes carpentry works measured in m2 or m length according to the item described in BOQ.
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Bill of Quantities
The results in the quantities book, are recorded in the BOQ table. It is preferable to add 5-10% percentage on the quantities for contingency to avoid any errors or any.
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Lecture # 5
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Methods of EstimatesA) Actual cost: is known at the completion of the work. B) Detailed Estimates :
must known before the construction stage, and it canbe prepared in four stages as follow: 1. Details of Measurements and calculation of quantities.(by using Details of Measurements Form )
2. Abstract of estimated cost.(by using Abstract of estimated Form )
3. Transfer the data to the Bill of Quantities. 4. Summary tableEng: Eyad Haddad 73
1. Details of Measurements FormDimensions S. N Item description Unit Quant. L W H Total Quantities Partially Positive + Negative Total
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2. Abstract of estimated Formmeasurement sheet project name _________________ contractor name ____________ engineer name _______________Dimension Quantity length width heigth
SN
Description
Unit
Unit rate Total amount
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3. Transfer the data to the Bill of QuantitiesNo. Item description unit Quantity Unit price ($ or NIS ) Total amount ($ or NIS )
1
The works include
L.S
See the attached exampleEng: Eyad Haddad 76
Bill of Quantities The items are classified into categories as shown in
the next table. at the end of BOQ, summary of the items are shown as well as the total amount of the price
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Example for the Bill of QuantitiesEXCAVATION & EARTHWORKSNO. DESCRIPTION UNIT QTY UNIT RATE $ TOTAL AMOUNT $
1.1
Excavation from natural ground level for foundation up to required designed level. The selected excavated material can be used for back filling, the surplus excavated material from the site. According to Eng. Instructions.
M3
1.2
Backfilling from the selected excavated material around foundation and to make up levels for the school yard in layers 25cm thick (M.D.D 98%) according to Eng. Instructions and specifications.Supply, spread , level and compact Aproved selected Material ( kurkar ) type A in compacted layer 25 an thick 98% Max .Dry Density around foundation and as per Specification and Eng. Instructions. Supply clean sand and fill in compacted layers 25cm thick for school yard to make up levels according to the drawings.Eng: Eyad Haddad
M3
1.3
M3
1.4
M3
Total78
Example for the Bill of QuantitiesCONCRETE WORKSNO. DESCRIPTION UNIT QTY UNIT RATE $ TOTAL AMOUNT $
The items include shuttering, steel shaping, fixing , supplying and cast the required concrete, striping of shuttering and two coats of water proof hot bitumen layer of type 75 for foundations, necks and ground beams and all requirement as per specifications, drawings and engineer instructions. 2.1 Supply and cast plain concrete B (200) kg/cm2 for Blinding beds 5 cm thick and 15cm plain concrete of entrance ramps as per specifications and drawings. Supply and cast ready mix concrete B(250) kg/cm2 for the ground slab 10cm thick with steel mesh 8mm diameter every 20cm including polythene sheets below concrete slab as per specifications and drawings. Supply and cast ready mix concrete B (250) kg/cm2 for reinforced concrete foundations as per specifications and drawings. Supply and cast ready mix concrete B (300) kg/cm2 for reinforced concrete columns and columns necks as per specifications and drawings. Supply and cast ready mix concrete B (250) kg/cm2 for suspended hollow block slab 20 cm thick, including the reinforced steel , drop and inverted beams, decorative archs , hollow cement block, 40 x 25 x 14cm and all other materials as per specifications and drawings. B250 reinforced concrete for Apron (surface treated with mechanical steel trolled finish) the price include polythene sheets. Reinforcement I 8mm / 20 cm in both way and reinforced edge beam the price including 15cm thick compacted base coarse according to drawing and specification. M3
2.2
M2
2. 3 2.7 2.12
M3 M3 M2
2.14
M3
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Total
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4. Summary tableNo. Item Total amount ($ or NIS )
12 3456789-
EXCAVATION & EARTH WORKSCONCRETE WORKS BLOCK WORK CARPENTRY METAL WORK FINISHING WORKS PLUMBING WORKS ELECTRICAL WORKS MISCELLANEOUSEng: Eyad Haddad 80
Item description Based on drawings, specification. It should be accurate and reflect the drawings and
specifications, Description should include :1- description of the works 2- unit 3- determine the method of measurement.
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How to read the description Description of the items Drawings, details Specifications General and specific conditions Instruction of the supervisor engineer
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the work price should include The description of the item should include all the work that the unit price will take account of as will be illustrated in the following
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1- Earth work
-
-
The unit price should include :Excavation in any kind of soil, rock, etc., starting at reduced level (bottom of G.B. blinding) down to bottom of foundation blinding including compacting backfill around foundations and shall be applied on layers, 200 mm thick, watered and compacted to 95 % (98%) according to modified AASHTO Density Test T-80.for the excavated foundation and removal of surplus material from site to an approved dumping area complete as per specifications. Site Leveling. (Excavation of all Site including External Works). Cut and / or fill in any kind of soil, concrete, or asphalt; to the required Levels approved by the Engineer (Reduced Level). Including scraping of top. Any damage to the external walls, fence, etc. should be maintained without any compensations.. Test of the soil (4 points at least) Safety around the site, Work according to engineer instruction and specificationsEng: Eyad Haddad 84
:- :- :- 1- . :- - . 05.1 , . - .
: 1- 1-1 1-2
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Concrete workConcrete works include: All formworks and shuttering in any form, shape and size. Making chamfered and curved edges, allowing for and making grooves and sleeves and the like; removal of forms and cleaning of all exposed tie wires and rods; making good the harmed surfaces and Supplying, Casting, vibrating and curing as per specifications. Approved additives and admixtures. Incurred costs on Concrete Mix Designs, Sample taking, testing and providing test results certificates, storing and saving of samples, and preparation of bar bending schedules and workshops. Supplying reinforcement of any grade, size and length as detailed in the drawings, storing on site including cutting, bending and fixing in position and providing all tying wires, spacers, shop drawings, testing and bar bending schedulesEng: Eyad Haddad 86
Concrete work (contd)
Painting of exposed surfaces of underground reinforced concrete elements with two coats of Bituminous Emulsion. Supply of Polyethylene sheets under ground slabs. Steel bars used for alignment and fixing of reinforcement works, and extra steel added to assure proper detailing and safety. Measurement of Concrete elements shall be the net dimensions as detailed in the drawings. All recesses, openings and voids shall be deducted. Measurement shall be only for the seen surfaces of elements, overlapping and measuring items twice under separate headings shall not be allowed. Supplying and fixing of the required steel reinforcement as per drawings and specifications.Eng: Eyad Haddad
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Block worksRates of Block works include All works of the bill shall be of Concrete blocks of high quality standards and as per specifications. Vertical and horizontal joints., Cement and mortar, Galvanized angles and ties., Closed end blocks at all ends, door and window jambs, reveals and the like. Concrete filling including reinforcing steel to cavities at quoins and door and window openings. Lintels and bond beams to the full length of the wall, and all needed to complete job as per drawings and specifications concrete infill and transporting, placing compacting, curing, surface finishing, protection, construction and expansion joints and all labors Eng: Eyad Haddad and materials and tests. 88
Block works (contd) Block work shall be bonded to concrete columns,
wall and the like with concrete infill B250. block must be stopped in graded shape (10-15 cm from the concrete face) one 8 mm bar must cast in columns during casting with 40 cm length fixed every 42 cm horizontally, in addition to two vertical 10 mm bars.
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Plastering works, includes
The price shall include, all narrow widths, for taking out joints on block walls or backing concrete face for key, for making good to frames around pipes and other fittings , plastering to jambs and reveals of openings ) ,( side of columns, window sills; all of which shall be included Price shall also include Expanded metal lath, angle beads at all corners and plaster stops at opening edges, expansion joints, sills, labor, curing, erecting and dismantling of scaffoldings ,)additives, pigments and all incidentals required as specified Material, workmanship, Galvanized mesh, or plastic mesh, False ceiling from galvanized mesh and plastering (fixing mesh , covering it by 3-coats of rough plaster) reinforcement of the joints between different material as the joints between the wall and columns.Eng: Eyad Haddad 90
Tilling works
Rate shall include preparation of surfaces under tiles, special tile peaces for edges and the like, tile surface finishing, Plastic spacers. Pointing and cleaning and all incidental as per specifications. Supply, Install and Terrazzo Tiles, include, bedding and jointing in cement and sand mortar, pointing with white cement, required sand fill, and polishing, workmanship, and all incidental as per specifications Isolation works for kitchen and bathroom (layer of fiber glass, and bitumen layers) Marble includes connections, joints, mortar, and any other needed work. Supply and install a layer of cement and sand under marble and porcelain , ceramic, according to specification and engineer instruction. Eng: Eyad Haddad 91
Painting works
All Paints shall be supplied to site in sealed container, as approved by the Engineer, and site mixing shall not be permitted. The Contractor rates shall include for supply of all materials, workmanship, samples, surface preparation , protection of painted surfaces , application to all heights as required of works, repair of all damaged surface, as per specification.
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CARPENTRY AND JOINERY WORKS (window & doors)
Sizes of carpentry works given in the Bills of Quantities are finished sizes and shall be as per Drawings. Sizes of doors and other items mentioned in the Bills of Quantities shall allow for tolerance to suit the structural openings shown in the Drawings. Wooden doors and pair of doors shall be measured in square meter for each structural opening, unless stated otherwise in the Bills of Quantities. Rates for carpentry and joinery work shall include : Shop and coordinated drawings. frames, architrave ( ,) and other holders Allowance for plastering and tiling and the like. Cutting and fitting around obstructions, Bedding and painting. Grounds, blocking and backings. Plugging concrete, block work, and stone work , and making good. Ironmongery including cylindrical locks, handles, stoppers, screws, temporary fixing, re-fixing, oiling and adjusting. Eng: Eyad Haddad 93
STEEL AND ALUMINUM WORKSRates for metalwork shall include for : Preparing shop drawings, Drilling, counter sinking, screwing, bolting and riveting. Sub frames, including galvanized steel frames for Aluminum windows and architrave. Gaskets, sashes, double weather strips and external and internal approved quality silicon filling around frames. Ironmonger including cylindrical locks (Union or equal) , stoppers, handles, temporarily fixing, refitting, oiling and adjusting. Providing two keys for each lock . Glass and glazing including cutting to size, putty and rubber. Preparing surfaces for and painting one coat of primer before fixing. Sealing and Painting to any area or width in any location including work in multicolor and cutting in edges. Eng: and incidentals required to execute the work. 94 All other accessoriesEyad Haddad
Electrical works
All items price to include Supply, Installing, Connecting and testing unless otherwise indicated, the contractor are requested to have approved full coordinated work shop drawings before starting contract activities, the price also includes all works necessary to implement electrical works in approved manner. The contractor intended to order main and final distribution panel boards according to approved manufacturer drawings. The price to include submittals, catalogs, any manufacturer instruction . The contractor should install and construct all works according to drawings , specification tender documents, and requirement of Electrical Co. Contractor should also test & submit the electrical Work to the Electricity Co. & Municipality.Eng: Eyad Haddad 95
PLUMBING, SANITARY AND MECHANICAL WORKS
Rates shall include all fittings , fixtures , appliances and pipe laying Supply of material, workmanship, installation, testing and commissioning. Rates to include also all peaces and fittings, including by passes , floats, cleaning outlets , automatic vents, vents and stack covers, valves and non return valves and the like needed to complete works as per specifications. Insulation and painting as called for in specifications. Excavation and cutting for all pipe laying works, bedding back filling and all works connected with pipe laying. All ties, sleeves, joints, tie bolts and rods, brackets and the like. Rates to include Workshops, Coordinated and as- built drawings as approved by the EngineerEng: Eyad Haddad 96
Lecture # 6
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Pricing & price analysis: Before construction three types of pricing
1- cost estimate () 2- pricing 3- cost analysis
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Preparation of prices
contractor
engineer
Cost analysis Eng: Eyad Haddad
pricing
Cost estimate 99
Factors affecting the pricing
Raw material Workmanship, labor, sub-contractors Administration cost including direct cost as salaries, equipments, transportation ..etc. and indirect cost as electricity, communication cost, banks , municipality fees, ,,,etc.,... , , , , ,
Unforeseen expenses & risk (3-5%)
,
Insurances Taxes as income tax , V.A.T, %17 Eng: Eyad Haddad 100
Factors affecting the pricing
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101
Productivity of labor It is necessary to calculate the productivity for the
work teams either worker or technicians / equipments to calculate wages, for workers / subcontractors. Productivity is measured per hour or per day.
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102
Productivity of labor
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Pricing analysis stages :1.
Estimate the price for raw material and
workmanship.2. Estimate the percentage of the specified work from
the total project work . (work item/total work*100%)3. Estimate the cost of administration / management ,
tax, insurances, risk, and profit.4. Estimate the total cost for all works item.Eng: Eyad Haddad 104
Example: Analyze the prices, and find the unit price for the
following, knowing that, 1- fixed (direct) administrative expenses for a project is (1000$). 2- Unfixed expenses (indirect cost) for a project is (400$) 3- Insurance 200 $.105
Eng: Eyad Haddad
ID1 2 3 4
Description of workConcrete footings Block works for wall (20*20*24cm) Internal plastering Wooden door 90*220
unitM3 M2 M2 No.
quantity78 100 200 10
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1- Price for raw material and workmanship- Concrete footing (B250)Raw material per m3
ID 1-
Description Concrete footings (B250)
price 190 170 5 2 1 3 371 471 134$ 134*78 = 10,960 $
Workmanship
Concrete Steel Wires Nails, bolts Water isolation
100
total Total price (NIS) Total price ($) Total for 78 m3Eng: Eyad Haddad
100
107
Block work (20*20*40 cm)Raw material per m2 block Morter Moving the blocks Joints, concrete fill total Total price (NIS) Total price ($) Total for 100 m2
ID
Description Block 20*20*40
price 12.5*2=25 3 2 5 35 41 11.7 11.7*100= 1170$
workmanship 6
6
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Internal plasteringID Description Raw material per m2 Price workmanship
scaffoldingInternal plastering Morter Angles, metal grid, ..etc water total Total price (NIS)
o.54 0.5 0.5 6 12
6
6
Total price ($)Total for 200 m2
3.43.4*200= 680$
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Wooden doors 220*90 cmID Description Raw material per m2 material price 400 20 420 470 50 workmanship 50
Wooden door 220*90Misce. total Total price (NIS)
Total price ($)Total for 10 doors
135135*10 =1350$
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110
percentage of the specified work from the total project work:ID Description Total work price % from total work
1
Concrete footings (B250)
10960
77.40%
2
Internal plastering
680
4.80%
3
Wooden door 220*90
1350
9.53%
45
Block 20*20*40TotalEng: Eyad Haddad
117014160
8.26%100.00%111
2- The cost of administration / management , tax, insurances, risk, and profit.administration expensesvariable (400$) Insurance tax (10%) (200$) risks (5%) profit (10%) Total
ID
Description
fixed (1000$)
1
Concrete footings (B250) Internal plastering Wooden door 220*90 Block 20*20*40
774.01=1000*77.4%
309.6=400*77.4%
1096=10%*10960
154.8
548
1096
3978.4
48.02 19.21=1000*4.8%
2 3 4
68 135 117
9.61 19.07 16.53
34 67.5 58.5
68 135 117
246.83 62 490.04 424.70
95.34 82.63
38.14 33.05
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total cost for all works itemID Description stage (1) stage (2) total 1.00 Concrete footings (B250) 10,960.00 3,978.42 14,938.42
2.00
Internal plastering
680.00
246.84
926.84
3.00
Wooden door 220*90
1,350.00
490.04
1,840.04
4.00
Block 20*20*40
1,170.00
424.70
1,594.70
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unit price for each itemID Description unit quantity unit price total 1.00 Concrete footings (B250) m3 78.00 191.52 14,938.42
2.00 Internal plastering
m2
200.00
4.63
926.84
3.00 Wooden door 220*90 4.00 Block 20*20*40
no
10.00
184.00
1,840.04
m2
100.00
15.95
1,594.70
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114
(Quiz 1 -16/03/2009) Choose the correct answer:
1. Types of Method of measurement is / are : a. engineering measurement b. conventional measurement2. Measurement of plastering: a. should not include the openings
c. a and b.
b. include the openings
c. none of all
3. Unit that is used to measured wages of the workers and requirement is : a. lump sum b. Number c. Day / hour 4. Unit of Measurement of Excavations is: a. M.R b. Number, c. M3
d. M2.
5. Unit that is used to measure works have fixed dimensions is: a. M.R b. Number, c. M3 d. all.
6. units that is used to measure works with variable dimensions : a. M3 b. M2 c. M.R7. Pricing shall include: a. Raw material b. Workmanship, labor, sub-contractors profit Eng: Eyad Haddad d. all above.
c. indirect cost , insurance,115
Lecture # 7Example
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1. Excavation & backfilling surving:
Dimensions S. N Type of Work Unit Quant. L W H
Total Quantities Partially Add + Dic Total
120
:2. Foundations
Dimensions .S N Type of Work Unit .Quant L W H
Total Quantities Partially + Add Dic Total
121
:3. Column necks
Dimensions .S N Type of Work Unit .Quant L W H
Total Quantities Partially + Add Dic Total
221
:4. Ground Beams
Dimensions .S N Type of Work Unit .Quant L W H
Total Quantities Partially + Add Dic Total
321
:5. Ground Slab
Dimensions .S N Type of Work Unit .Quant L W H
Total Quantities Partially + Add Dic Total
421
:7. columns
Dimensions .S N Type of Work Unit .Quant L W H
Total Quantities Partially + Add Dic Total
521
:8. block
Dimensions .S N Type of Work Unit .Quant L W H
Total Quantities Partially + Add Dic Total
621
:9. Plastering
Dimensions .S N Type of Work Unit .Quant L W H
Total Quantities Partially + Add Dic Total
721
Lecture # 8Estimating & Evaluation
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Form of evaluation based on cost per unitID 1 2 3 Description Concrete footings Block 20*20*40 Wooden door 220*90 cm unit m3 m2 no Unit price NIS 550 50 600
4
Internal plastering
m2
8
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Cost per m2 of floor area (residential building)Description (m2) Structural elements finishing total stores 70 40 110 Ground floor First floor 80 80 160 60 80 140
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Cost of housing unit = cost of m2 * the areas of the unit
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131
Analysis of quantitiesAnalysis to raw material quantities for example :- Concrete : cement, water, aggregate, steel, - Cement in 1m3: - Mixing proportion (4:2:1) = 300kg, 6:3:1 = 200 kg, - 8:4:1 = 150 kg
- 1m3 concrete = 80% aggregates, 40% sand- 1m3 (footings) = 60kg.Eng: Eyad Haddad 132
Miscellaneous works 1m2 block (40*20*20) = 12.5 block 1m2 tiling (25*25) = 16 1 sack of cement = 18-20 m2 plastering 1 sack cement = built 100-120 blocks
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133
Estimation of Concrete price 1 m3 concrete consist of : 350 kg cement (1.2-1.3) ton aggregates 0.8 ton sand Price of mixing and pouring, transportation The total price will be =
= 0.35 *300NIS+1.3*70+0.8*120+20 (mixing) =320 NIS
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134
Steel reinforcement In general and according to practices, the following
elements contains , Steel reinforcement 1m3Foundation=50kg 1m3ground 1m3 1m2 1m3 1m3
beams=100kg
slab=90kgslab=17-20kg column=80kg ground slab=50kg 80kg/m3135
stairs=
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136
Payment certificate(
)
Financial Request for payment, prepared by contractors,
and approved by consultant / owner , describing the actual
achieved works , by calculating the unit price by thequantity of item done. It is important for the contractor as well as for the owner.
For the contractor, he gets the value of works done, and save
to him liquidity for the owner , he become aware of the progress, achieved
(actual) and planned, therefore, he can know if there is any obstacles or delay() Eng: Eyad Haddad 137
Preparation of payment1- preparation by contractor
Pay the amount of the payment request Eng: Eyad Haddad
Review and approved by the consultant/ supervisor engineer 138
Types of payment certificates1- interim payment certificate 2- final statement / final payment certificates
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139
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140
1- interim payment certificate It is request for payment, contains quantity survey for
the accomplished works , and other supporting details submitted by contractor over the progress period of the project, . The amount of each request should not be less than
10% of the contract value or according to contractconditionsEng: Eyad Haddad 141
Contents of the payment certificate1- Financial Payment Certificate:it is a survey of the accomplished works (actual done), multiplied by its value according to the contract. 2- Measurements : 3- Drawings : as built drawings.
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Content of the Payment CertificateFirst: Financial Payment Certificate:It contains : ( Summary, actual works, documents)
1- summary: describing the commencement date, project end date, in addition to other data as contract value, variation order, percentage of the accomplished works, value of the current payment, and due payment, any
amount to be deducted for retention,Eng: Eyad Haddad 143
Content of the Payment Certificate1- summary: (Cont.) Percentage of retention stated in the Contract Data
to the total of the above, and Retention Money (if any) stated in the
Contract Data; any amounts to be added and deducted for the
advance payment , the deduction of amounts certified in all previous
Payment Certificates.
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144
Payment Certificate (Cont.)2- Actual work: total price of the accomplished works, and percentage of the work done in relation to total project.
3- Documents: other supporting documents including the description of the items, progress in each item previously and alsoEng: Eyad Haddad current, unit price, total percentage of the project 145
Payment CertificateSecond : measurementsAnd it is table of actual quantity surveyaccomplished, including item description, number, volume (length, width, height) and the total.
Third : As build drawingsdescribing the details of the work done.Eng: Eyad Haddad 146
Final payment certificate It is called the final payment (certificate) after the
primary taking over the project.The process of approval as follows: 1- after taking over the project, final request for payment is prepared, the contractor signed the request for payment and the measurement sheet, and submitting it to engineer( owner). 2- to be paid the following documents should be attached :Eng: Eyad Haddad 147
2- to be paid the following documents should beattached : Copy of taking over certificate signed form the
committee Copy of the bid submitted from the contractor after
considering the prices in the request for payment defect liability security All tests results
Deduction of the works that mentioned in the taking
over or any liquidated damages. Letters of project extension if it was extended. Eng: Eyad Haddad148
Final payment certificateContents of the final payment certificate : Application for the request List of the actual accomplished works and its value. List of measurements As build drawings as it was approved from the
engineer.Eng: Eyad Haddad 149
Lecture # 9
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Estimating of reinforcement steel for footings & columns
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151
Table of reinforcement steel weights :Diameter Wt of 1m length (kg) Area of section (mm2) Perimeter (mm)
6 8 10 12 14 16 18 20 22 25 28 32 36 40
0.222 0.395 0.617 0.888 1.209 1.58 1.999 2.468 2.986 3.856 4.837 6.318 7.996 9.872Eng: Eyad Haddad
0.283 0.502 0.785 1.13 1.539 2.01 2.543 3.14 3.799 4.906 6.154 8.038 10.174 12.56
1.884 2.521 3.14 3.768 4.396 5.024 5.652 6.28 6.908 7.85 8.792 10.048 11.304 12.56152
Weight of 1m of steel bar = Y ( *(V (( Y R. Steel = 7850 kg / m3 Weight of 1m of steel bar = ((7850*3.14/100*100*4)*D2)
Weight of 1m of steel bar = (diameter, cm)2 * 0.617 Area of section = r2
Perimeter (mm) = 2 r
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153
Footing tableF4, C4 F3, C3 F2, C2 F1, C1
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154
Length of steel Bars : F1 : 1.5 x 1.3 x 0.45 m, 9 12 F2 = 1.7 x 1.5 x 0.45 m, & 11 12 F3 = 1.9 x 1.7 x 0.45 m, & 12 12 F4 = 2.1 X 1.9 X 0.5 m, & 14 12 Concrete cover = 5 cmEng: Eyad Haddad 155
Reinforcement = 1112 , &Reinforcement = 1312 , Reinforcement = 1412 , Reinforcement = 1612 ,
For F1: Length of steel in longitudinal direction: Ls = 1.5 - .05*2 =1.4 m In vertical direction at both sides = (0.45-0.05*2)/3 *2= 0.24 m The total for bar in longitudinal direction = 1.4+0.24+0.12*2=1.88 m The total length for all steel in longitudinal direction = length of 1 bar *number
of bars in the direction = 1.88*11=20.57 m In traverse direction: = 1.3 0.05*2+0.12*2+0.24 = 1.68m Total length for all steel in the short direction = 9 *1.68 = 15.12 m
The total in both direction = 35.69 m WT of steel for one foot type F1 = 35.69 * 0.888= 31.693 kg For all F1 = 31.693 *4 = 126.77kg.Eng: Eyad Haddad 156
ID
Item description
unit
Diam.
Length of bar
Total length
Wt of 1m
Total Wt
No. of Total WT footings for all F1
drawings
1
Reinforcemen t steel for footings : F1 Kg 12 In long 1.88*11 0.888 directio +1.68*9 n = 1.88 = 35.69 m In short directio n = 1.68
31.693
4
126.77
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157
For column neck: C1 = 25*60, 614
(F1 : 1.5 x 1.3 x 0.45 m, Reinforcement =
1112 , & 9 12) Length of one bar: Excavation depth = 1.5 m, floor height = 0.48 m Steel leg = 1.5 (0.05*2)/4 = 0.35 m The total length = 1.5 +0.48+0.35+0.14 0.1 0.05 0.024 = 2.296 m
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158
For stirrups: If length of column section 60cm, two ties is needed Concrete cover for column = 2.5 cm For C1 = 25*60 Length of stirrups= (0.6 0.05)*2 = 1.1m Width of stirrup= (0.25-0.05 )*2 = 0.4m ( = mm * 10) cm Total length of the stirrup= 1.1+0.4+0.08*2 = 1.66m
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FloorCOLUMNS NECK & GROUND COLUMNS NECK & GROUND COLUMNS NECK & GROUND
Type
Column .NOC2 , C3 , C4 , C5 , C7 , C8, C9 C10 , C14 , C17, C19, C20, C21 C22 , C23 , C25,C26, C27,C29 C30 , C31 , CC
Dim.(cmXcm)
Reinf. 6 14
NOTES :STR. 1 8 / 20 cm
A B C
40 x 25
C12 , C13 , C15 , C16 , C18
40 x 20
6
14
STR. 1
8 / 20 cm
C1 , C6 , C11, C24 , C28 , C32
45 x 45
16
14
STR. 2
8 / 20 cm
COLUMN TYPE A40cm 25cm
COLUMN TYPE B40cm 20cm
COLUMN TYPE C45cm
45cm 1 8mm@20cm 1 8mm@20cm 2 8mm@20cm
Remark : column ( cc )start from the ground beam Eng: Eyad Haddad
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Type
No.
ColumnsC2,C3,C4,C5,C7,C8 C9, C10 , C14 , C17 C18, C19, C20 , C21 C22 , C23 , C25,C26 C27, C29 , C30, C30 C1 , C11, C12 , C13 C15 , C16 , C24, C32
Dimentions (cm Xcm) 100 X 100
Thickness (cm) 30
Reinforcement
Remarks
F1
22
6
12
in both direction
F2 F3
8 2
140 X 140 160 X 160
40 40
8 10
12 12
in both direction in both direction
C6 , C28
Typical Footing F1
Typical Footing F2Eng: Eyad Haddad
Typical Footing F3167
170.55 4.00
0.40 0.55 2.33 C 0.40 C
C18Beams Width Hight B1 B2 B3 55 40 45 25 25 25
Bottom Reinf.
Top Reinf. Stirups
2 14 3 14 3 14
2 14 2 14 2 14
2 14 2 12 2 12
1 1 1
8mm /20cm 8mm /20cm 8mm /20cm
15
C16
A 3.22 B A B
C120.45
C13
1 14mm 1 14mm3.00
C1
0.40
Eng: Eyad Haddad
C2
168
10cm
Home Work 250cm
40cm
T125cm
T2 T1 T1 T2 T1 T1 T1
T2 T1 T2 T1 T2 T1 T1 T2
T1 T110cm
T150cm 40cm
25cm
T1 T210cm
T1 T1
50cm 40cm
25cm
T1 T2 T3Eng: Eyad Haddad
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