MPUMALANGA PROVINCIAL GOVERNMENT

Transcription

1 Civil Technology 1 June 2015 MPUMLNG PROVINCIL GOVERNMENT DEPRTMENT OF EDUCTION GRDE 11 CIVIL TECHNOLOGY JUNE 2015 MRKS: 150 TIME: 3 Hours Consists of 10 pages and 2 answer sheets

2 Civil Technology 2 June 2015 INSTRUCTIONS ND INFORMTION 1. This question paper consists of THREE questions. 2. LL questions are COMPULSORY. 3. nswer each question as a whole, do NOT separate sub questions. 4. Start each question on a NEW page. 5. Sketches may be used to illustrate your answers. 6. LL calculations and written answers must be done in the answer book.. 7. LL the drawings are to be fully dimensioned and neatly finished off with descriptive titles and notes to conform with the SNS/SBS Recommended Practice for Building Drawing. 8. For the purpose of this question paper, the size of a brick should be taken as 220 mm x 110 mm x 75 mm 9. Use your discretion where dimensions and/or details have been omitted. 10. Non-programmable pocket calculators may be used. 11. nswer Question 3.1 ND 3.3 on NSWER SHEET 3.1 and 3.3 using drawing instruments.

3 Civil Technology 3 June 2015 QUESTION 1: CONSTRUCTION SFETY ND MTERILS 1.1 Building sites must be prepared and facilities been provided before any construction work can start Name THREE factors that should be kept in mind to secure a building site. (3) Name FIVE important factors to consider when working on a ladder. (5) 1.2 Every year we experience accidents during excavation processes. Name FOUR safety rules that should be considered while doing excavations. (4) 1.3 Fires are a great risk in all working places: Copy the table in your NSWER BOOK and, Match the following Classes of fire with the Type and the Extinguisher which can be used to extinguish the fire. CLSSES TYPE OF FIRE EXTINGUISHER Class flammable liquids dry chemical or CO Class B electrical fires soda-acid or gas propelled water Class C wood, paper. foam,dry chemical or CO 2 (6) 1.4 Concrete landscape blocks are commonly used in the building industry Name TWO properties of concrete. (2) Explain TWO uses for concrete building blocks. (2) What is the purpose of landscape blocks? (2) List TWO places where landscape blocks are mostly used. (2) 1.5 Steel is an all important material used in construction Describe FIVE properties of steel tubing. (5) List FIVE uses of steel tubing. (5) 1.6 Explain one safety regulation that a person must take when working with the following tools ngle grinder Portable electrical plane Plastering trowel Monkey wrench (4)

4 Civil Technology 4 June The following annotation appears on a reinforcement work plan, explain to your fellow workmen what is meant by 8R (4) 8 = 02 = R = round mild steel 20 = 300= 1.8 FIGURE 1.8 shows a line diagram of a concrete beam. Complete the figure in your NSWERBOOK and: Draw a longitudinal section through the beam to show all the reinforcing in the beam. Show clearly the following: Main bars nchor bars Shear bar Binders Minimum concrete cover ll labels. (8) FIGURE The building regulations (SNS) stipulate guidelines of where and how DPC s should be positioned. Write in your NSWER BOOK and list FIVE places where the builder can position the DPC ( 5) 1.10 FIGURE 1.10 shows the first layer of a corner junction (quoin) built in an English bond. Draw in your answer book, the second layer (Consecutive layer). (5) FIGURE 1.10

5 Civil Technology 5 June 2015 QUESTION 2 PPLIED MECHNICS 2.1 In order to comply with the SI units that are used, one needs to know both the unit and its symbol. Write down number on your answer sheet and complete the missing part of the table (4) UNIT SYMBOL Meter M Energy J Weight Newton Force N 2.2 Graphically determine the size of the equilibrium force as indicated in the following space diagram. (Determine the unknown force P) R 50N (4) N S 25N FIGURE FIGURE 2.3 shows a beam with THREE point loads... 20N 40N 30N 5m 6m 3m 2m B C D B L R FIGUUR What is the total length of the beam? (1) Calculate the size of the force in L. (4) Calculate the size of the force in R. (4) Do a test to see if your answers at L and R are correct. (2)

6 Civil Technology 6 June Complete the following shear force calculations. Just write the missing answer next to the correct question number in your answer book: SfB = (value L) 20N = SfC = value L) 20N = _ SfD=(value L) 20N value at) value = (4) 2.5 Complete the following bending moment calculations. Just write the missing value next to the correct question number in your answer book: BmB = (value L x 5m) = BmC = (value L x 11m) (20N x 6m) = _ BmD = (value L x 14m) (20N x 9m) (30N x 3m) = _ (3) 2.6 simple supported beam with a span of 14 meters, loaded with one point load and one uniformly distributed load (UDL), is shown FIGURE N 5N/m RL=25N 2m B 2m C 4m D RR=35N FIGURE Convert the UDL into a point load (2) Calculate the values of the shear forces at,b,c, and D. (4) Draw a shear force diagram of the beam by using scale 1N = 1mm (4)

7 Civil Technology 7 June You are GIVEN two regular shapes, a triangle and a square. 40 B Calculate the RE of lamina and B (4) Determine by means of calculation the centroid of each lamina (8) Draw figure and B on your answer book and indicate by means of drawing the position of a centroid in each figure. Scale1:1. (2) [50]

8 Civil Technology 8 June 2015 QUESTION 3: In FIGURE 3 you are supplied with an incomplete floor plan of a new proposed outside dwelling showing the outlines of the walls and roof. The centre line of the interior walls is also shown. USE NSWERSHEET 3.1 and: 3.1 Draw to a scale 1:50 the complete floor plan as indicated by outlines.(20) 3.2 Draw the view of the wall showing the windows on the points W1 and W2. 20) Roofline D Gable roof line Internal wall W1 W2 FIGURE 3.1

9 Civil Technology 9 June 2015 [40] TOTL: 150

10 Civil Technology 10 June 2015 QUESTION/ VRG 3 NSWER SHEET/ NTWOORD BLD 3.1 and 3.2 NME/NM GRDE/GRD 11 Roofline D Gable roof line Internal N W1 W2 N (20)

11 Civil Technology 11 June 2015 NSWER SHEET/ NTWOORD BLD 3.2 NME/NM GRDE/GRD 11 (20) (40)

12 Civil Technology 12 June 2015

13 -1- MPUMLNG PROVINCIL GOVERNMENT MPUMLNG PROVINSILE REGERING DEPRTMENT OF EDUCTION/DEPRTEMENT VN ONDERWYS GRDE 11 GRD 11 CIVIL TECHNOLOGY SIVIELE TEGNOLOGIE MEMORNDUM JUNE 2015 CONSIST OF 12 PGES /BESTN UIT 12 BLDSYE MRKS/PUNTE: 150 TIME/TYD : 3 Hours

14 -2- CONSTRUCTION SFETY ND MTERILS QUESTION 1: Fenced off /Toegespan word Notice boards displayed / Inligtings borde moet vertoon word. Site must be safe for persons to work on /Terrein moet veilig wees. Heavy vibration by machinery or vehicles nearby/ Vibrasie van masjiene en voertuie Consider other correct answers Enige ander aan vaarbare korrekte antwoorde (3) Name FIVE important factors to consider when working on a ladder..only one person should work on a ladder at a time.slegs een persoon moet op n leer wees.. Ladders must be used on a stable and level surfaces unless secured to prevent accidental movement.lere moet op stabiele harde oppervlaktes gebruik word.. Whenever the ladder need the ladder need to tied to prevent it from slipping, this can be done at the top or at the bottom and do not use the rungs to tie the ladder. Waar moontlik moet lere vas gemaak word om te verhoed dat die leer gly..keep metal ladders away from overhanging cables. Metaal lere moet weggehou word van oorhoofse kabels. Do not move, shift or extend ladders while in use. Moenie lere skuif of verleng wanneer dit gebruik word.maintain ladders free of oil, grease and other slipping hazards. Onderhou lere vry van olies of enige ander gly bare vloeistowwe.consider any other correct answer. Enige ander aan vaarbare korrekte antwoorde (5) 1.2 Every year we experience accidents during excavation processes. Name FOUR safety rules that should be considered while doing excavations.. The area under excavation must be fenced off and warning signs must be visible. Die gebied onder konstruksie moet afgekamp word en waarskuwings tekens aangebring word.

15 .Workers must wear hard hats and protective and reflective clothes. Werkers moet harde hoede dra en veiligheids en reflekterende klere dra. Cover the area completely after working hours, particulary if there are children entering the site. Die gebied totaal afgeskort word na ure..the sides of trenches deeper than 1,5m should be protected or braced. Die kante van uitgrawings moet versterk en beskut word..whilst the excavation is in process no tools or materials other than those in use are allowed inside the trench. Terwyl uitgrawings gedoen word moet slegs gereedskap wat gebruik word in sloot wees.. responsible person should investigate the trenches for safety daily and especially after bad weather or rain. Die uitgrawings moet daagliks en na swaer reen geinspekteer word deur gekwalifiseerde persoon..consider other correct answers (4) 1.3 Fires are a great risk in all working places: each of the following types of fires and name at each which type of fire extinguisher should be used to kill the fire: Class wood,paper etc/hout,papie soda-acid or gas propelled water. Soda suurof gas aangedrewe water(2) Class D flammable liquids foam, dry-chemical or carbon dioxide type of extinguisher Vlambare vloeistof (2) Class C electrical fires Elektriese brande Skuim of droe gemikaliee dry chemical or carbon dioxide type extinguishers Skuim of droe gemikaliee (2). It can be cast into any mould design Kan in enige vorm gegiet word. It is water resistant Water bestand. It is durable Duursaam It is easy and inexpensive to maintain /Maklik en goed koop om instand te hou. Consider other correct answers Construction of cavity walls Konstruksie van spou mure.construction of external and internal walls Konstruksie van binne en buite mure (2)

16 1.4.3 What is the purpose of landscape blocks?.construction of waterways /Kanal te bou.construction of flowerpots/ Blom bakke.construction of walls / mure (2)..Consider any other correct answer Name TWO places where landscape blocks are mostly used.longside driveways/langs motor opritte.longside waterways /langs water wee.consider any other correct answer. (2) >Contains little carbon./baie min grafiet >It is not as strong as solid steel profiles. /nie so sterk soos soliede profiele nie >It is malleable./maklik om mee te werk > it rust easily./roes maklik >It is easy to weld./sweis maklik >Can be galvanized to prevent rust or to be used in specific areas./kan gegalvaniseer word >It is ductile/pliable / maklik om te smee en te vorm. > Consider any other correct answer. (5) >Used as pillars for balcony balustrades or lattice work./gebruik vir pilare.balkonne >Can be used as post for signage./pale vir inligtings borde >Can be used as fence posts./heinings pale >Can be used for shelving./rakke >Can be used for the construction of frames of security gates./rame vir sekuriteits hekke > Can be used as palisade in fences. Palisades en heinings (5) >Consider any other relevant answer ngle grinder > Make sure that the blade has stopped moving before leaving the grinder unattended Maak seker die lem het gestop voordat enige verstellings gedoen word

17 > Use both hands to operate the machine. Gebruik altwee hande op masjien > Remove the electric power plugs when adjustments are made. Verwyder die elektriese prop uit muur voordat verstellings gemaak word > Wear a dust mask when cutting stone and/or concrete. Dra stofmaskers wanneer klip gesny word > Make sure that the grinding wheel is free of cracks or chips. Sny wiel sonder enige happe of krake > Consider other correct answer. (1) Portable electrical plane > Remove electric power plug when adjusting the machine. Verwyder dieelektriese prop uit muur voordat verstellings gemaak word > Use both hands to operate the machine. Gebruik altwee hande op masjie > lways wear safety goggles Dra altyd veiligheids brille. > (1) Plastering trowel > Do not use the with a broken handle always replace with a new one. > Rense and clean after use. > Consider any other correct answer. (1) Monkey spanner. >Use the tool for its purpose. Gebruik gerredskap vir die doel waarvoor dit gemaak is > lways stand firmly and well balanced. Staan altyd ferm en geballanseerd (1) > Consider any other correct answer = Total number of bars in the group getal stawe in groep 05 = Bar number/aantal stawe R = round bar ronde staaf 20 = Diameter of the bar in millimeters./diameter in millimeters 300=Center center spacing in millimeters. senter tot senter in millimeters (4)

18 1.8 FIGURE 1.8 shows a concrete beam, copy the figure in your answer Book and: Draw a longitudinal section through the beam to show all the reinforcing in the beam. Show clearly the following: Main bars/hoof nchor bars/ anker Shear bar/skuif kragte Binders/binders, Minimum concrete cover/min beton dekking ll labels/ LLE BYSKRIFTE (8) FIGURE It must be placed under all the windowsills./ vensterbanke It must be placed at 150mm above the ground level on a building/150mm bo grondvlak in muur It must be placed below the copings./onder oorhange It must be placed on top of lintels. Bo voorafvervaardigde beton lateie It must be placed between concrete floor and the hardcore. Tussen vloer en bo hardepiun vulling. (5) Consider any other correct position.

19 1.10 FIGURE 1.10 (5) [60] QUESTION 2: PPLIED MECHNICS 2.1 UNIT/EENHEID SYMBOL/SIMBOOL Metre/Meter m Energy/Energie Joules J Weight/ Gewig Kilogram Kg Force Krag Newton N (4)

20 2. R 50N N S 25N 30N (4) 2.2 fa= R= 50N ef=s= 85N scale= 1: 1N f b c e d a (4) N 40N 30N 5m 6m 3m 2m B B C D L R

21 2.3.1 > 16m Calculate the size of the force at L. (1) > Taking moments from RR to calculate RL. > > RL. 16 =(30N. 2m) + (5m. 40N) + (11m. 20N) > RL16 = > RL16/16 = 480/16 =30N (4) > Calculate the size of the force at R. > Taking moments from RL to calculate RR. > RR.16 =(20N. 5m) + (40N.11m) + (30N. 14m) RR16 = 100N + 440N + 420N RR16/16 = 960N/16 =60N (4) Do a test to see if your answers at L and R are correct. > Upwards forces /Opwaartse kragte = Downwards forces/ fwaartse kragte kragte 30N + 40N + 20N = 30N + 60N 90N = 90N (2) SfB = (value L) 20N = 20N SfC = value L) 20N 40N= -30N SfD= (value L) 20N value at (2.4.2) value (2.4.3) = -60N (4) BmB = (value L x 5m) = 150Nm BmC = (value L x 11m) (20N x 6m) = 210Nm BmD = (value L x 14m) (20N x 9m) (30N x 3m) = 150Nm (3)

22 2.6 FIGURE N 5 N/m B C 2 m 2 m 4 m D RL =25N RR=35N FIG Convert the UDL spread across Point C-D into a point load Verander verspreide belasting in n punt belasting. (2) > 4m. 5Nm =20N (4) > Point = Left reactive./linker reaksie = 25N > Point B = 25N - 40N = - 15N > Point C = 25N 40N -0N = -15N > Point D = 25N -40N 0N 20N = -35N N : 1mm. 25 B C -15 D

23 (4) B Calculate the RE of lamina and B.Die Opp.van enb > Shape = half base. height Half basis maal loodregte hoogte = 30/2. 40 = = 600mm2 > Shape B = Length.width lxb = 60mm. 40mm = 2400mm2 (4) > Lamina = b/3 and h/3 = 30/3 and 40/3 =10mm and13,33mm > Lamina B = W/2 and L/2 = 30/2 and 40/2 =15mm and 20mm (8) C C

24 (2) [50] USE NSWERSHEET QUESTION 3: FIGURE 3.1 Roofline D Gable roof line Internal W1 W2 (20) 3. 2 GL FFL (20)

25 Total/Totaal=150