Tendering and Estimating Assignment 2

7/28/2019 Tendering and Estimating Assignment 2

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Tendering and Estimating

Assignment 2

Lecturer U. I. B. Daswatta

Dr. Nirodha fernando

CSCT2011214


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HND In Quantity Surveying and Construction Economics

CSCT 2011214 Page 2

Content

Content ................................................................................................................................... 2

Acknowledgement ................................................................................................................. 3

Introduction ............................................................................................................................ 4

Scenario.............................................................................................................................. 5

Task 01 ....................................................................................................................................... 5

Three major factors related to build up unit cost ............................................................... 5

Material .......................................................................................................................... 5

Labour ............................................................................................................................ 6

Plant ............................................................................................................................... 6

Overhead ........................................................................................................................ 7

Task 02 ....................................................................................................................................... 8

Material cost................................................................................................................... 8

Plant and Equipments .................................................................................................... 9

Labour ............................................................................................................................ 9

Method Statement ............................................................................................................ 12

Task 3 ....................................................................................................................................... 15

Trench Excavation ........................................................................................................... 15

Labour .......................................................................................................................... 16

Reinforcement Beam ....................................................................................................... 16

Material cost................................................................................................................. 17

Labour .......................................................................................................................... 18

Cement lime and sand plaster .......................................................................................... 19

Material ........................................................................................................................ 20

Labour .......................................................................................................................... 21

PVC Gutter....................................................................................................................... 22

Materials ...................................................................................................................... 22

Labour .......................................................................................................................... 23

Conclusion ........................................................................................................................... 25

References ............................................................................................................................ 26


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CSCT 2011214 Page 3

Acknowledgement

To become a professional Quantity Surveyor we need theoretical knowledge as well asbetter knowledge on practical applications. Therefore, I would like to offer my sincere

thanks to Colombo School of Construction Technology staff and grateful to all those who

supported us in any respect during the completion of this assignment. I would like to offer

my grateful thanks to our lecture Dr. Nirodha Fernando, and all the lectures guiding me

toward valuable Assignment report. My special regards with very great attitude to my

parents.


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CSCT 2011214 Page 4

Introduction

In this assignment, calculate the unit cost using operational method pricing and unit rate

pricing. In the first task, describe the factor that related with the build up unit cost in the

BOQ. The material, plant and labour are a main three factors according with unit cost.

In the second task there are calculation unit rate for the work item using the operational

method. In this task, use Building Schedule of Rates for pricing.

In the third task describe the how to build up unit rate several work items using the Building

Schedule of Rates.


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CSCT 2011214 Page 5

Scenario

The Government of Sri Lanka has proposed to implement an industrial zone in Northern

Province as a part of rehabilitation program. The project includes infrastructure

development (land development, water supply and drainage, electricity,

telecommunication, road network, etc) and buildings such as factories, accommodation

buildings, offices, stores, etc by different investors.

Task 01

In order to build up tender for the given project, collect data required to build up unit costs.

(P4)

Tender is a main document of new proposed project. To order to build up tender firstly

client want make up the BOQ. To prepare BOQ for entire project the Quantity surveyor must

need source of many data. Whoever prepare a BOQ they need gathered accurate data for

prepare accurate BOQ. The overestimated and underestimated cost should bad result for

contractor, rejecting tender or loses from the project. To built up unit price in BOQ based on

several factors. In those factors material, labour and plant is became three major factors.

Every unit rate in BOQ based on these three factors. When these factors changed the unit

rate is also changed.

Three major factors related to build up unit cost

Material

A material is something used to make things. When we speak about material, we mean

physical substances. In a construction industry we used different types of materials. cement,

sand, metal, steel and bricks normally used construction industry. The prices of material is

based on its purchase price with allowances for delivery, offloading, storage and placing and

wastage.


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CSCT 2011214 Page 7

Another factor is when they purchase or hire some plants can that plant and equipment

transport to the site in safely of with out any barriers. Because the project is in ruler area,

sometimes there road network is not in good condition. Therefore, the plant and machinery

can damage or brake down within transport to the site.

Overhead

Every contractor looking for cover their overheads and get more profits from the project.

Overhead and profit added to the cost of all work items to cover. The amount added for

overheads and profit is normally given as a percentage and the percentage decided by the

contractor. They want to look above factors and difficulties they can face during the project.


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CSCT 2011214 Page 8

Task 02

Build up unit rate for following work item using operational pricing method. Answer shall

include method statement for the work item. (P6)

Description Qty Unit

Concrete, G20, in 150mm thick ground slab, poured against earth 90 m

Assume that for concreting ground slab use ready mix concrete and placing with the pump

machine and labours.

According to the ICC Ready mix concrete rates, cost of1m3

is Rs. 11,000/=.

Pumping rate is Rs. 600/= for 1m3. (All transportation and other cost including above rates).

Material cost

Total Concrete volume = 90 m3

Cost for 1m3

of ready mix concrete = Rs. 11,000

Cost for total concrete volume = 90 m3

x Rs. 11,000

= Rs. 990,000

Water (Curing)

90 gal for 1.42 m3

Total gal = 90/1.42 x 90 m3

= 5704.23 gal

Cost for 1 gal = Rs. 0.50

Total cost for vibrator = Rs. 0.50 x 5704.23 gal

= Rs. 2852.11

Total cost for material = Rs. 990,000 + Rs. 2852.11= Rs. 992,852.11


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CSCT 2011214 Page 9

Plant and Equipments

Pumping rate for 1m3

= Rs. 600

Total cost for pumping = Rs. 600 x 90 m3

= Rs. 54,000

According to BSR 0.5 day for 1.42 m3

Total days = 0.5/1.42 x 90 m3

= 31.69 days

Cost for 1 day = Rs. 1500

Total cost for vibrator = Rs. 1500 x 31.69 days

= Rs. 47,535

Total cost for plant = Rs. 54,000 + Rs. 47,535

= Rs. 101,535

Labour

Labour for placing concrete (SK labour)

0.5 days for 1.42 m3

Total days for concreting = 0.5/ 1.42 x 90

= 31.69 days

Rate foe 1 day = Rs. 1200

Total cost for mason = Rs.1200 x 31.69 days

= Rs. 38,028.17


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CSCT 2011214 Page 10

U/SK Labour

1 days for 1.42 m3

Total days for concreting = 1.5/ 1.42 x 90

= 95.07 days



= Rs. 76,056.34

SK Labour for Vibrator0.5 days for 1.42 m

3

Total days for concreting = 0.5/1.42 x 90

= 31.69 days



= Rs. 38,028

U/SK Labour for Curing

0.5 day for 1.42 m3

Total days for concreting = 0.5/1.42 x 90

= 31.69 days


Total cost for mason = Rs. 800 x 31.69 days

= Rs. 25,352

Total cost for Labour = Rs.38,028.17 + Rs.76,056.34 + Rs.38,028 + Rs.25,352

= Rs. 177,464.51


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Cost for Concreting = Rs. 992,852.11 + Rs. 101,535 + Rs. 177,464.51

= Rs. 1,271,851.62

Add 30% for overhead and profit = 30/100 x Rs. 1,271,851.62

= Rs. 381,555.49

Total cost for concreting slab = Rs. 1,271,851.62 + Rs. 381,555.49

= Rs. 1,653,407.11


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Method Statement

Purpose:-

The purpose of this method statement is to describe the construction procedures for theconcreting ground slab.

Scope:-

The works will incorporate the procedures necessary to execute the following items.

Responsibilities of client and Contractor Attending personals Health and safety Plant, Machinery and equipment Preparing of work Work Methodology

Project Detail:-

Contractor : ICC (Pvt) Ltd

Project Name and Address : Concreting Ground slab at Dental institute

Client : Ministry of Health and Nutrition

Responsibilities of client and contractors Provide and maintain access roads, hard standing for the machineries (a,level hard standing, capable of carrying the outrigger loads as specified in the Lifting

Plan) and stacking area / off-loading area.

Provide and maintain scaffolding of the working area, together withhandrails, guardrails, platforms or staging required for safe access and to preventoperatives from falling.

Welfare facilities shall be made available to the flooring sub-contractor.

Attending personals Appointed person: Name the appointed person to control of the lifting

operations.


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Safety Officer: Appointed person who will be control and inspect the safety atsite.

QA / QC Engineer: person who appointed check the performance of theworks in relation to the method statement, approved drawings and material

specifications. Site Engineer: Responsible for all activities carried on site and inspection all of

works.

Foreman: The foreman, will identify himself to the site management onarrival at site.

Health and Safety Personal protective equipment: All workers will wear the following: - safety

helmet, high visibility vest, gloves and safety footwear.

Safety glasses/goggles; ear defenders; dust mask. All operatives and workerswill comply with any other specific site requirements.

Site rules: All operatives and workers will be informed of the contractors siterules and obey with them.

Specific site hazards: Any specific site hazards must be identified and dealwith prior to placing operations commencing on site. E.g., provide suitable

protection to up-standing steel reinforcing starter bars or provide adequate

bearing for props.

Access to the work area: Access to the work area is the responsibility of thecontractor / client.

Work at heights: The contractor / client must provide and maintainscaffolding of the working area, together with handrails, guardrails, platforms

or staging required for safe access and to prevent operatives from falling.

Welfare facilities: The contractor / client must provide access to welfarefacilities. The flooring subcontractor will make a first aid box available.

Plant, Machinery and Equipment Tower crane / Mobile Crane Concrete Pumps Concreting Buckets Vibrators Wheelbarrows, etc. as applicable


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Preparing for Works Request for design mix based the concrete grades specified on structural

drawings from the Ready Mixed Concrete Supplier.

Submit the proposed design mix to client / clients representative forapproval.

Before the ending all setting out works and excavations, formwork and layingpolythene works are not commence.

Compacting ground slab bottom using 10-ton vibrating rammer. Laying gauge 1200 polythene on the concreting surface clearly. Arrange the formwork around the edge of ground slab area using 15mm thk

plywood and 2x2 timbers.

After finishing all polythene, laying and forming formwork clear the surface. Arrange the all reinforced according to the drawing and maintain the cover

blocks correctly. Inspection of structural members must do with client /

clients representative.

Work Methodology Take concrete cube samples from the truck for quantity specified. Mark the location of pour for concrete received on the site as reference and

identification.

Provide sufficient equipment, machinery and labour to carry out theconcreting works.

Place concrete on selected locations using concrete pumps and / or craneassisted concrete buckets.

Start concreting from a fresh location and continue continuous tocompletion.

Place concrete from the lowest point to the final concrete level in oneoperation in horizontal layers.

Compact concrete by mechanical vibrators. Certify that concrete is workedinto the corners of the structural members.

After the concrete has set, carry out curing works by applying curingcompound.


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Task 3

Build up unit rates for following work items. (P7)

Item Description Unit Rate

2.A.2 Trench excavation depth exc. 1.0m and n.e. 2.0 m m

3.B.5 Tor steel bar reinforcement, 16mm dia in beams at roof level Tonne

3.G.2 16mm thick 1:1:5 cement, lime and sand plaster finish smooth with lime

putty on internal walls

m

3.E.5 150mm dia half round PVC eaves gutter fixed o timber valance boardincluding gutter joiner, brackets, gutter head, mitres and end caps m

Trench Excavation

Assumptions;

Firm soil excavation

100% hand excavation

Excavation quantity = 1.5 m x 0.6 m x 1 m

= 0.90 m3


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Labour

According to BSR labour out put 0.71 m3

per day

Excavation quantity = 0.90 m3

Total days for excavation = 1 / 0.71 m3x 0.90 m

3

= 1.27 days

Rate for U/SK labour = Rs. 800 per day

Cost for excavation = Rs. 800 x 1.27 day

= Rs. 1014.08

Allow 4% for tools = 4/100 x Rs. 1014.08

= Rs. 40.56

Total cost for excavation = Rs. 1014.08 + Rs. 40.56

= Rs. 1054.64

Add 30% for overhead and profit = 30/100 x Rs.1054.64

= Rs. 316.39

Unit rate for 1m3

= Rs. 1054.64 + Rs. 316.39

= Rs. 1371.03

Reinforcement Beam

Assumptions;

10 m long beam Transport and unloading cost include the reinforcement rate Binding and bending cost include the labour rate


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Length of bars

10000Ddt 2/30 60

9940

Add hook 2/12/16 384

10324

Add lap 40/16 640

10964

Material cost

Length of bar = 10.96 m

Nr of bars in beam = 6

Total length of bars = 65.78 m

Unit weight of 16 mm bar = 1.58 kg

Total weight of bars = 65.78 m x 1.58 kg

= 103.94 kg

16 mm dia reinforcement 1tonne is Rs. 130,000

Cost of bars = Rs. 130,000/ 1000 kg x 103.94 kg

= Rs. 13512.20

Add 1.5% spaces = 1.5/100 x 13512.20= Rs. 202.68

Add 3% tools = 3/100 x 13512.20

= Rs. 405.37

= Rs. 13512.20 + Rs. 202.68 + Rs. 405.37

= Rs. 14120.25


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According BSR binding wire 1.5 kg per 50 kg

Total weight of binding wire = 1.5 kg/50 kg x 103.94 kg

= 3.12 kg

Cost for binding wire = Rs. 185 x 3.12 kg

= Rs. 577.20

Total material cost = Rs. 14,120.25 + Rs. 577.20

= Rs.14,697.45

Labour

SK labour, binding and bending 50 kg per day

Total days work = 1/50 kg x 103.94 kg

= 2.08 days

Rate for SK labour = Rs. 1500

Cost for SK labour = Rs. 1500 x 2.08 days

= Rs. 3118.20

U/SK labour, binding and bending 50 kg per day

Total days work = 1/50 kg x 103.94 kg

= 2.08 days

Rate for SK labour = Rs. 1100

Cost for SK labour = Rs. 1100 x 2.08 days

= Rs. 2288

Total labour cost = Rs. 3118.20 + Rs. 2288

= Rs. 5406.20


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Cost for 16mm dia reinforcement beam = Rs. 14,697.45 + Rs. 5406.20

= Rs. 20,103.65

Add 30% over head and profit = 30/100 x Rs. 20,103.65

= Rs. 6031.10

Add 10% wastage = 10/100 x Rs. 14,697.45

= Rs.1,469.75

Total cost foe beam = Rs.20,103.65 + Rs.6031.10 + Rs.14469.75

= Rs. 27,604.50

Unit rate for 1 tonne = Rs. 27,604.50/ 103.94 kg x 1000 kg

= Rs. 265,581.10

Cement lime and sand plaster

Assumptions;

Total internal wall length is 100m and height is 3m

1 Sq = 9.29 m

2

1 kg = 0.02 Cwt

Total wall area = 100 m x 3 m

= 300 m2


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Material

Cement

According BSR 0.8 bag for 1 sq

Nr of cement bags = 0.8/ 9.29 m2

x 300 m2

= 25.83 bags

= 26 bags

Cost for cement = 26 x Rs. 940

= Rs. 24,440

SandAccording BSR 0.07 cub per 1 Sq

Volume of sand = 0.07/9.29 m2

x 300 m2

= 2.26 cub

Cost for sand = 2.26 cub x Rs. 9000

= Rs. 20,344.46

Slaked lime

According BSR 0.66 Cwt per 1 Sq

= 1 kg/0.02 Cwt x 0.66 Cwt

= 33 kg

Volume of slaked lime = 33 kg/ 9.29 m2

x 300 m2

= 1065.66 kg

Cost for slaked lime = Rs. 300/50 kg x 1065.66 kg

= Rs. 6,393.96


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Water

According BSR 10 gal per 1 Sq

Volume of water = 10 gal/ 9.29 m

2

x 300 m

2

= 322.93 gal

Cost for water = 322.93 gal x Rs. 5

= Rs. 1,614.64

Total cost for material = Rs.24,440 + Rs.20,344.46 + Rs.6393.96 + Rs.1614.64

= Rs. 52,753.06

Labour

According BSR SK labour 1.5 days for 1 Sq

Total days of SK labour worked = 1.5 days/9.29 m2

x 300 m2

= 48.44 days

Cost for SK labour = 48.44 days x Rs. 1200

= Rs. 58,127.02

According BSR U/SK labour 1.5 days per 1 Sq

Total days of SK labour worked = 1.5 days/9.29 m2

x 300 m2

= 48.44 days

Cost for SK labour = 48.44 days x Rs. 900

= Rs. 43,596

labour cost = Rs. 58127.02 + Rs. 43,596

= Rs. 101,723.02

Add 4% for tools and scaffoldings = 4/100 x Rs. 101,723.02


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= Rs.4068.92

Total labour cost = Rs. 101,723.02 + Rs. 4068.92

= Rs. 105,791.94

Cost for plastering = Rs. 52,753.06 + Rs. 105,791.94

= Rs. 158,545

Add 30% overhead and profit = 30/100 x Rs. 158,545

= Rs. 47,563.50

Add 5% wastage = 5/100 x 52,753.06

= Rs. 2637.65

Total cost for plastering = Rs.158,545 + Rs.47,563.50 + Rs. 2637.65

= Rs. 208,746.15

Unit rate for 1 m2

= Rs.208,746.15/300 m2

x 1 m2

=Rs. 695.82

PVC Gutter

Materials

According BSR all Quantities for 8m length

150 mm thk gutter (4m length) = 2 Nos

Cost for gutter = Rs. 800.00 x 2

= Rs. 1600.00

Gutter brackets = 17 Nos

Cost for brackets = Rs.15.00 x 17

= Rs. 255.00


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Gutter joiner = 1 Nos

Cost for gutter joiner = Rs. 300.00 x1= Rs.300.00

End caps = 2 Nos

Cost for end caps = Rs. 85.00 x 2

= Rs.170.00

Gutter head = 1 Nos

Cost for gutter head = Rs. 650.00 x 1

= Rs. 650.00

9mm brass screws = 34 Nos

Cost for screws = Rs. 2.50 x 34

= Rs. 85.00

Solvent cement = 20 gms

Cost for solvent cement = Rs. 1.50 x 20

= Rs. 30.00

Total material cost = Rs.3090.00

Labour

SK labour = 0.5 days

Cost for SK labour = Rs.1000.00 x 0.5

= Rs.500.00


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U/SK labour = 0.5 days

Cost for U/SK labour = Rs. 800.00 x 0.5

= Rs. 400.00

Labour cost = Rs. 500.00 + Rs. 400.00

= Rs. 900.00

Add 5% for plant and scaffolding = 5/100 x Rs. 900.00

= Rs. 45.00

Add 3% for tools = 3/100 x Rs. 900.00

= Rs.27.00

Total labour cost = Rs. 900.00 + Rs. 45.00 + Rs. 27.00

= Rs. 972.00

Cost for gutter fixing = Rs. 3090.00 + Rs. 972.00

= Rs. 4062.00

Add 27% overhead and profit = 27/100 x Rs. 4062.00

= Rs. 1096.74

Total cost for fixing gutter = Rs. 4062.00 + Rs. 1096.74

= Rs. 5158.74

Unit rate for 1m = Rs. 5158.74/8 m

= Rs. 644.84


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Conclusion

The project Quantity surveyor is the main character in tender process. He wants to prepare

BOQ and pricing it. Before the build up unit rate he want gathered several data according

with the unit rate. Build up unit rate without any information that must harm to contractor.

Because the overestimated and underestimated cost should, bad result for contractor,

rejecting tender or loses from the project. To build up unit price in BOQ based on several

factors. In those factors there are three main factors called material, labour and plant.

Collecting data above those three factors much needed is in Sri Lanka day by day there are

price fluctuation in the market. Therefore that directly accordance with unit rate. Building

Schedule of Rate is suitable for pricing in every workstation.


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References

Building Schedule of Rates

www.safetyculture.com.au/...method-statements/.../concrete_preparati.

Tendering and Estimating Assignment 2

Documents

Transcript of Tendering and Estimating Assignment 2