Explain the importance of estimating quantities

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Reference no: EM133126125

CONM 40013 Professional Practice and Procedure for QS

Learning outcome 1: Recognise and explain the purpose and need for measurement including its impact upon the practice of measurement and the management of construction cost

Learning outcome 2: Recognise and explain the importance of estimating quantities and establishing the outline cost

Learning outcome 3: Recognise and explain the relationship between the objectives of cost, quality and time in construction process

Learning outcome 4: Develop interpersonal skill through individual and group activities

Learning outcome 5: Identify problems and propose innovative and/or creative solution in the context of practical application and delivery, including the use of information technology

Learning outcome 6: Collect, integrate and synthesise project information and data from a variety of sources, analyse, evaluate, interpret and present complex factual information in a systematic manner

Learning outcome 7: Demonstrate a critical flexibility to the cost management of construction project

Professional Assignment

There are two ways of calculating present and future values when there are multiple cash flows. Both approaches are straightforward extensions of our earlier analysis of single cash flows.

1. Explain the variations on the calculations of these values.

2. What considerations are made when determining which method you use to calculate present and future values?

3. How are cash flows affected when one method is used over another?

Your report must be contained within a 2 to 4 page, APA-formatted paper. You should also have a minimum of two, academic or peer-reviewed resources (properly identified, cited, and referenced) to support your thoughts.

Assessment Task

QUESTION 1 - MEASUREMENT AND BQ PRICING FOR EXCAVATION WORK

Greenfield Development has identified a site in Rushcliff, Nottinghamshire to build 50 houses comprising of 28 units detached house type Sapphire and 22 units semi detached maisonette type Ruby with roads, pavings, fencing, drainage services and landscaping. Site clearance has commenced and excavation package has been issued to the bidders. As their inhouse QS, you are to prepare the pretender estimate for the Excavation package, using the drawings and Bills of Quantities provided.
Using the following drawings, measure the quantities of the following items and insert the quantities and the unit in the prepared Bills of Quantities and price them. The taking off must be done on dim paper, using excel format. A template of this document is provided on NOW. You must use this template and ensure your work is of a professional standard.

Take off list

1. Remove topsoil 150mm thick
2. Retaining excavated material in spoil heaps
3. Excavate to reduce level
4. Dispose excavated materials off site
5. Excavate trench for foundation
6. Dispose excavated materials off site

Additional guidance relating to Excavation work

1. Assume the site is level
2. Ground level is 150mm below Finished Floor Level
3. Topsoil is to be taken as 150mm thick and retained in temporary spoil heaps
4. Concrete foundations to be 300mm thick.
5. Please refer to the following plan for the widths of the foundations (full size version on NOW)
6. Do not scale the drawings. Images for clarity
1. Typical detail of substructure wall, foundation and beam and block floor

2. Please refer to the following plan for widths of the foundations. Full version on NOW. Ignore the widening/projection of the internal foundation. Just measure 450mm wide foundation throughout as shown in the diagram below

QUESTION 2 & 3 - MEASUREMENT AND BQ PRICING FOR WALL AND CONCRETE

Newark and Sherwood District Council (NSDC) proposes to build a Multi Purpose Block, adjacent to the existing Sports Hall. The scope of work is outlined in Red and includes Plant/Boiler Room.
Tender for the Proposed Multi Purpose Block based on Lump Sum Contract Without Quantities have been issued to the bidders. As a Client's QS, you are required to submit your pre-tender estimate for Wall and Concrete package using the Bills of Quantities provided, to compare against the contractors' tender sum.
Using the drawings and take off list provided below, measure the quantities and then insert the quantities and unit in the prepared Bills of Quantities and price the BQ.

Concrete
1. Concrete in foundation
2. Concrete in floor
3. Mesh Reinforcement in floor

Substructure Wall
1. 103mm Engineering bricks, skins of hollow walls
2. 100mm blockwork, skins of hollow walls
3. 140mm blockwork, skins of hollow walls
4. 100mm blockwork, single walls
5. 140mm blockwork, single walls
6. Forming cavity 100mm wide
7. Filling cavity with concrete
8. Damp proof course Superstructure Wall
1. 103mm Facing bricks, skins of hollow walls
2. 140mm blockwork, skins of hollow walls
3. 100mm blockwork, skins of hollow walls
4. 100mm blockwork, single wall
5. 140mm blockwork, single wall
6. 215mm brickwork, attached pier
7. Forming cavity 100mm wide
8. Filling cavity with insulation
9. Preformed cavity tray at DPC level
10. Contrasting band
11. Decorative bricks
12. Air bricks
13. Vent wall extract fan

Additional information and specification relating to measurement of Walls and Concrete

Please allow for the following which takes precedence over any conflicting information on the drawings :-

1. Assume the site is level
2. All concrete foundations to be mass concrete 21N/mm2, 20mm aggregate; depth shall be 1.00m deep
3. Concrete floor shall be reinforced concrete grade C35
4. Reinforcement for the concrete floor shall be one layer mesh reinforcement ref A252 weighing 3.95kg/m2. Allow 25mm clearance around the edges of the slab
5. Height of substructure wall shall be from top of foundation to DPC
6. Height of superstructure external perimeter wall = 2.485, superstructure internal walls = 2.560
7. Cavities to be formed with Ancon SD1 stainless steel wall ties, 900mm horizontal centres and 450mm vertical centres.
8. Cavities to be filled with lean concrete mix C15 up to ground level
9. 103mm Terca Sahara Textured buff brickwork in a continuous ornamental band on course 18.
10. 103mm Terca Sahara Textured buff brickwork shuttlecock motif corbel on gable wall.
11. DO NOT deduct doors, windows and serving hatch. Adjustment for door and window openings is measured elsewhere.
12. Solder course above doors and windows, lintels and closing cavity around openings measured elsewhere.
13. When measuring the superstructure walls along the corridor, deduct the full height openings as outlined in blue on the diagram below. The height of the opening shall be the same as internal walls.
14. 215mm common brickwork attached piers are shown in red circles on the drawing below
15. Please exclude the brickwork encasing the steel columns along gridline D, indicated as D2, D3, D4, D5 from the wall measurement.
16. Please ignore this widening of the blockwork on the front elevation. Just measure the blockwork through as the detail of the other cavity walls.
17. Do not scale the drawings

QUESTION 4 - MEASUREMENT AND BQ FOR STEELWORK

Using the drawings and take off list provided below, measure the quantities and then prepare the Bills of Quantities for Steelwork

Take off list
1. Fabrication and permanent erection on site for Steelwork in Sports Hall
a. Columns 203x203x46 UC
b. Roof beams 152x89x16 UB
c. Ridge beam 152x89x16UB
d. Rafters 305x165x54UB
e. Hip rafters 203x133x25 UB
f. Jack rafters 203x133x25 UB
g. Angles 200x100x10mmx23
h. Eaves ties/beams Metsec 330E29
2. Fabrication and permanent erection on site for Steelwork in Entrance Canopy
a. Columns 90x90x5mm SHS
b. Beams 127x76x13 UB
3. Fittings, allow 5% of total weight of steel frames
4. Holding down bolts

The taking off must be done on dim paper, using excel format. Once the take off is complete, you can produce the Bills of Quantities (BQ) for Steelwork. A template of this document is provided on NOW. You must use this template and ensure your work is of a professional standard. Your BQ shall include full NRM2 descriptions and quantities. Remember that the BQ items should be in the order that is presented in NRM2.

Additional information and specification relating to measurement of Steelwork
Please allow for the following which takes precedence over any conflicting information on the drawings :-

1. All steelwork shall be to BS EN 10025 S355
2. Use the following levels to measure the steel columns in Sports Hall
a. Top of Foundation 25.100
b. Top of Column 32.885
3. Steel columns are welded to 400mm x 400mm x 20mm thick base plates; plates bolted to column bases with 4 nos 20mm diameter holding down bolts 375mm long. Allow 25mm thick grout to underside of base plates. See diagram below.
4. Do not scale the drawings
5. Do not price the BQ

Attachment:- Professional Practice and Procedure.rar

Reference no: EM133126125

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