Arakelian_A._4018A_A3

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TAFE NSW - Sydney Institute *

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4018A

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Civil Engineering

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Dec 6, 2023

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CPCCBC4018A: Assessment 3 Answer sheet Please type your answers in black font. (Calibri 12 point) Student’s signature ______________________________ (Electronic Signature is accepted) Note: OTEN has the right to reject your assessment if the above declaration has not been completed. LA023626, Assessment 3, Answer sheet, CPCCBC4018A, Ed5 1 © New South Wales Technical and Further Education Commission, 2018 (TAFE NSW – WSI), Archive version 1, July 2018

What you have to do For this assessment, you will require the Project 1 documentation. The questions in this assessment relate to Project 1. How you will be assessed The questions in this assessment cover a number of areas within the unit of competency You will need to show that you are competent across all the areas contained in this assessment. YOU MUST show all workings where you have done calculations. Please type your answers in black font. (Calibri 12 point) Questions 1. You have taken a measurement on Lot 14 from the south west corner to the north east corner of the allotment. The measurement you obtained from your tape measure, laying it on the ground, was 43,866 mm, measured to the nearest millimetre. a) Is this the true dimension for the distance between the two pegs on plan view? This wouldn’t represent the true distance in plan view. b) If the answer to part ‘a’ is no, what is the true dimension on plan view and explain the reason for the difference? (use Pythagoras’ theorem) The true dimension can be obtained by; h^2 = 18000^2 + 40000^2 h^2 = 1924000000 h = sqrt (1924000000) Therefore; h = 43863.4243989 mm This wouldn’t represent the true distance in plan view as the lot is sloping from the SW corner up towards the NE corner where there is a 0.5m gain in elevation. This gain in elevation will mean that the distance measured by the tape measure is slightly longer. 2 LA023626, Assessment 3, Answer sheet, CPCCBC4018A, Ed5 © New South Wales Technical and Further Education Commission, 2018 (TAFE NSW – WSI), Archive version 1, July 2018

2. You have engaged a surveyor to carry out an identification survey of Lot 14 (peg the four corners of the boundaries) and to peg the 6m building line (the setback of the house from the front boundary). a) From the north west corner of the allotment, calculate the angle and distance to the north west corner of the proposed building b) From the contours determine the total fall across the footprint of the building By utilising the RL’s shown on the contour plan, approximately, Highest point at NE corner of Family room would be RL 0.310 Lowest point at SW corner of Patio would be RL 0.075 The amount of fall between the two points is obtained by subtracting the lower RL from the higher RL. 0.310 - 0.075 = RL of 0.235 total fall across the footprint of the building. Therefore there is approximately 235mm of fall. LA023626, Assessment 3, Answer sheet, CPCCBC4018A, Ed5 3 © New South Wales Technical and Further Education Commission, 2018 (TAFE NSW – WSI), Archive version 1, July 2018

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c) Assuming you will construct a level, rectangular platform for the construction of the building, extending 1m beyond the external walls of the building, what are the approximate dimensions of this platform? Based on the Ground Floor Plan; = (18580 + 2000) x (11870 + 2000) = 20580 x 13870 4 LA023626, Assessment 3, Answer sheet, CPCCBC4018A, Ed5 © New South Wales Technical and Further Education Commission, 2018 (TAFE NSW – WSI), Archive version 1, July 2018

d) Utilizing the surveyors' pegs, outline, step by step, how you would set out the building using profiles and string lines to allow any excavation, formwork/slab construction to be accurately completed. LA023626, Assessment 3, Answer sheet, CPCCBC4018A, Ed5 5 © New South Wales Technical and Further Education Commission, 2018 (TAFE NSW – WSI), Archive version 1, July 2018

See Sketch above; 1. Setting up of string-lines between all 4 boundary corners of the site to determine boundary lines and enable set up of batter boards 2. Establishment of 12 batter boards / profile boards along and parallel to all the respective boundary lines and in line with each other (see sketch) and well outside the excavation footprint. – 2 boards installed perpendicular to one another (checked for square using Pythagoras theorem), and to encompass and extend past all 4 building corners (Total 8 boards) - 2 boards installed opposite one another on either side of the front and back of the house, located such that the extent of the front and back patio can be determined and strung across. - 2 boards installed to enable locating rear building line of house 3. Once all batter boards are established, the 1500mm setback is established onto the 2 batter boards running along the N-S boundaries (front and back boundaries) 4. Next, the 6000mm setback is established onto the 2 batter boards which run along the E-W boundaries (side boundaries) 5. Stringlines are connected between the marks on the above mentioned batterboards, which will establish the datum point on the site, see legend, this is the 6m setback and 1.5m setback which establishes the NW corner of the buildings external wall. 6. Measurements are now taken along the batter boards to indicate all the intricacies of the building footprint, steps, setbacks, front patio extent, rear patio extent, all the other building corners. Marks are placed on the batter boards opposite one another, and stringlines can be run between these batterboards at any point by following the marks. The marks should be labelled accordingly for quick and easy reference at any point or stage of the construction project. A surveyor should be engaged to check these marks ideally and place them on the batter boards. 7. Measurements can be taken along the string-lines also. 8. Using pythagoras theorem and trigonometry, locations can be determined without having to rely on the batter boards either side of the building and relying on string- lines running across the entire site. Calculations would be made on plan to determine angles, hypotenuse etc. 6 LA023626, Assessment 3, Answer sheet, CPCCBC4018A, Ed5 © New South Wales Technical and Further Education Commission, 2018 (TAFE NSW – WSI), Archive version 1, July 2018

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e) Outline how you would construct the formwork to achieve the required Finished Floor Level. A surveyors benchmark would be set, and ideally all of the batter boards would have the top of the timber set to the required SSL (allowing enough room for the required FFL). This way, any stringlines being run would also be set to the correct SSL. Irrespective of the above, formwork and excavations should always be checked with an automatic level / rotating laser or theodolite to ensure the timbers are set to the correct height and/or nails set up for the required concrete height. The benchmark is again critical to enable the automatic level to be set up based on a confirmed RL, enabling accurate construction of the slab at the correct height. During the pour concrete finish level should be checked progressively. It is important for the formwork to be strong enough to support loads from workers, plant and concrete bearing on them. LA023626, Assessment 3, Answer sheet, CPCCBC4018A, Ed5 7 © New South Wales Technical and Further Education Commission, 2018 (TAFE NSW – WSI), Archive version 1, July 2018

f) From finished floor level shown on the drawings (RL 0.000), subtract 200mm to allow for the slab and sub grade thickness. This reduced level is sometimes referred to as the bulk excavation level (BEL). From this BEL, the contours, and the dimensions of the rectangular platform, calculate the approximate volume of the bulk excavation for the building (use diagrams where needed to illustrate your method). See overleaf for sketches, diagrams and working calculations. In order to simplify the problem, the contour lines will be made paralell to the front and rear boundaries, and, thereby, perpendicular to the side boundaries. This way, a section comprised of a simple triangle can be drawn, its area calculated, and the width of the platform applied to the area, to deduce a volume. This simplification is plausible as, since the contours run at a consistent angle and are linear (not curved), any shortfall of excavated material on the northern end of the excavation or the would be accounted for by an equal increase of excavated material on the southern end, therefore estimating the total excavation volume accurately enough. The platform was deduced as being 20580 x 13870. See overleaf the location on plan for the platform respective to the contour lines and also a cross section of the excavation to aid in the calculations which are located below. The area of the triangle is; = [20.58 x (0.29-0.05)] x 0.5 = 2.47m2 The area of the rectangle below it is; = 4.12m2 Total cross-sectional area of the excavation is; = 6.59m2 Therefore the total volume is; = 6.59 x 13.87 = 91.40m3 8 LA023626, Assessment 3, Answer sheet, CPCCBC4018A, Ed5 © New South Wales Technical and Further Education Commission, 2018 (TAFE NSW – WSI), Archive version 1, July 2018

LA023626, Assessment 3, Answer sheet, CPCCBC4018A, Ed5 9 © New South Wales Technical and Further Education Commission, 2018 (TAFE NSW – WSI), Archive version 1, July 2018

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3. Assuming the RL at the top of the vehicle access (crossing) is 0.030, the top of kerb is - 0.030 and the kerb height is 100mm, a) Draw a longitudinal section of the vehicle crossing from the kerb to the front boundary Lot 14. (Note that the length of the crossing is 3.2m; determined by scaling off the drawing) 10 LA023626, Assessment 3, Answer sheet, CPCCBC4018A, Ed5 © New South Wales Technical and Further Education Commission, 2018 (TAFE NSW – WSI), Archive version 1, July 2018

b) Determine the grade from the top of the crossing to the bottom of kerb as a percentage and a ratio. It would seem more appropriate to determine a grade from the top of the crossing to the line where the layback starts as this would be the primary grade The length of this primary grade = 3200 – 700 = 2500mm The RL to the line of the layback start for simplification would be taken to be; = –0.03 The RL to the line of the driveway where it meets the boundary is taken as; = +0.03 Therefore the total rise is equal to’ = 60mm Over a distance of 2500mm the gradient would be; = 60 / 2500 = 0.024 = 2.4% As a percentage = 1 in 41.6 As a ratio However if addressing the question verbatim Bottom of kerb RL = -0.13 Top of driveway RL = 0.03 Total Rise = 160mm 160 / 3200 = 0.05 = 5% = 1 in 20 LA023626, Assessment 3, Answer sheet, CPCCBC4018A, Ed5 11 © New South Wales Technical and Further Education Commission, 2018 (TAFE NSW – WSI), Archive version 1, July 2018

4. The client on Project 1 has requested provision be made for storm water detention on the site. The hydraulics engineer has calculated the capacity of the pit necessary for the site to be 23,000 litres. Calculate a pit dimension that would meet this capacity requirement and that can be constructed within the front area of the property; that is, in the area between the front boundary and the front building line. Do not position the tank within 3m of the building. (1000L = 1m3) 12 LA023626, Assessment 3, Answer sheet, CPCCBC4018A, Ed5 © New South Wales Technical and Further Education Commission, 2018 (TAFE NSW – WSI), Archive version 1, July 2018

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Checklist I have:  named my file appropriately.  surname_Your first initial.Unit number_Assessment number (e.g. Smith S.4018A_A3)  completed the Assessment cover sheet  submitted my assessment report as a single combined PDF file.  answered all questions in the manner described  clearly identified my answers  saved a copy of the assessment on my computer  checked spelling, grammar and punctuation  presented my own work, used only my own words, except where cited, and  followed the presentation guidelines found on the OLS If you require clarification, please contact your teacher at OTEN to discuss. LA023626, Assessment 3, Answer sheet, CPCCBC4018A, Ed5 13 © New South Wales Technical and Further Education Commission, 2018 (TAFE NSW – WSI), Archive version 1, July 2018 NOTE: This is a competency-based assessment. You will receive a result of Satisfactory or Unsatisfactory . This means that you must satisfactorily complete each question (or part thereof) to meet the competency requirements set out in the training package. If you do not meet the competency requirements, you will need to resubmit your assessment until competency is achieved.

Arakelian_A._4018A_A3

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