GRADE 11 NOVEMBER 2015 CIVIL TECHNOLOGY - Best …€¦ · GRADE 11 NOVEMBER 2015 CIVIL TECHNOLOGY ... 1.3 Describe FOUR aspects of mounted steel reinforcement which ... 3.4.4 Traps

NATIONAL SENIOR CERTIFICATE

GRADE 11

NOVEMBER 2015

CIVIL TECHNOLOGY

MARKS: 200 TIME: 3 hours

This question paper consists of 12 pages, including 2 answer sheets and a formula sheet.

2 CIVIL TECHNOLOGY (EC/NOVEMBER 2015)

Copyright reserved Please turn over

REQUIREMENTS 1. ANSWER BOOK 2. Drawing instruments 3. A non-programmable pocket calculator INSTRUCTIONS AND INFORMATION 1. This question paper consists of SIX questions. 2. ALL questions are COMPULSORY. 3. Answer 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. ALL calculations and written answers must be done in the ANSWER BOOK. 7. Use the mark allocation as a guide to the length of your answers. 8. Drawings and sketches must be done in pencil, fully dimensioned and neatly

finished off with titles and labels to conform to SANS (SABS) Recommended Practice for Building Drawings.

9. Use your discretion where dimensions and/or details have been omitted. 10. Answer QUESTION 5.2 and QUESTION 6.1 on the ANSWER SHEETS

provided.

(EC/NOVEMBER 2015) CIVIL TECHNOLOGY 3


QUESTION 1: CONSTRUCTION PROCESSES 1.1 What is the purpose of the following bars in a reinforced concrete beam? 1.1.1 Main bars (1) 1.1.2 Anchor bars (Compression bars) (1) 1.1.3 Shear bars (1) 1.1.4 Stirrups (2 x 1) (2) 1.2 Briefly describe the purpose of the bar schedule which is sent to the steel

fixing company. (2) 1.3 Describe FOUR aspects of mounted steel reinforcement which must be

checked before the concrete is cast. (4 x 2) (8) 1.4 Which type of load causes lateral forces in a column? (1) 1.5 Name TWO advantages of using metal as formwork material. (2 x 1) (2) 1.6 Identify the parts 1.6.1 to 1.6.6 of the formwork in FIGURE 1.6. (6 x 1) (6)

FIGURE 1.6 1.7 Briefly describe the manufacturing process of a prestressed concrete lintel. (3) 1.8 Name THREE advantages of prestressed concrete lintels. (3 x 1) (3) [30]



QUESTION 2: ADVANCED CONSTRUCTION PROCESSES 2.1 Make a neat sketch in good proportion of a half brick wall and indicate the

following: 2.1.1 FIVE brick layers (1) 2.1.2 Stretcher bond (1) 2.1.3 Dead end at the left hand-side (1) 2.1.4 Raking back at the right hand-side (2) 2.2 Briefly describe the purpose of the line blocks in the construction of brick

walls. (2) 2.3 Briefly describe the purpose of the wall plate in a roof construction. (2) 2.4 Indicate whether the following statements are TRUE or FALSE.

Write only the word TRUE or FALSE next to the number in the ANSWER BOOK.

2.4.1 Horisontal dagha joints are called bed joints. (1) 2.4.2 Brick force is a wire net of galvanised steel. (1) 2.3.3 Beam filling is a wooden beam to which roof tiles are fixed. (1) 2.4.4 Lugs are used to bind the leaves of cavity walls. (1) 2.4.5 Damp proofing in outer walls must be at least 50 mm from the

ground level. (1) 2.5 Briefly motivate why a cavity wall must have a weep-hole opening. (2) 2.6 Briefly describe the principles responsible for the retaining function of the

precast concrete retaining structures. (2)



2.7 Answer the following questions with regard to the shoring construction in FIGURE 2.7:

FIGURE 2.7 2.7.1 What is the advantage of this type of shoring? (1) 2.7.2 Name FIVE factors which will influence the type of design for the

shoring. (5 x 1) (5) 2.7.3 Name the parts 2.7.A and 2.7.B. (2) 2.8 Which type of tool will be used for the following type of work? 2.8.1 To test whether floors have been horizontally casted (1) 2.8.2 To hold plaster up for plaster work (1) 2.8.3 To run multiple grooves next to each other in concrete floors (1) 2.8.4 To wet the plastering during the floating process (1) 2.8.5 To cut various profiles in wood for edge cutting work (1) 2.9 Describe THREE safety measures which are applicable when working with the

thicknesser. (3 x 2) (6) 2.10

Name THREE measures which must be applied when a worker sustains a neck injury. (3 x 1) (3)

[40]



QUESTION 3: CIVIL SERVICES 3.1 Briefly motivate why a pressure control valve must be installed in a geyser

by referring to purposes of the pressure control valve. (3) 3.2 Which valve protects the geyser against vacuum collapse? (1) 3.3 Briefly motivate why each geyser must be supplied with a safety tray. (2) 3.4 Indicate whether the following statements are TRUE or FALSE.

Write only the word TRUE or FALSE next to the number in the ANSWER BOOK.

3.4.1 Soil water is discharged in a gully. (1) 3.4.2 The section size of sink discharge pipes is 50 mm. (1) 3.4.3 The angle of drain bends is 90º. (1) 3.4.4 Traps are used at the outlet of geysers. (1) 3.4.5 A water closet is connected to a 110 mm drain pipe. (1) 3.4.6 The purpose of a water lock is to prevent the waste water from

pushing up into the wall fittings. (1) 3.5 What is the purpose of a ball valve and where will it be found? (2) 3.6 Name FOUR places where manholes are installed in a drain system.

(4 x 1) (4) 3.7 What is the purpose of rodding eyes in a drain system? (1) 3.8 Briefly motivate why drains must be laid in a straight line. (2) 3.9 Make a neat sketch to illustrate the construction of a backdrop system.

Also indicate the position of the rodding eye. (4) 3.10 What is the maximum pitch of a drain pipeline? (1) 3.11 Make neat sketches and indicate the abbreviations of the following drain

symbols: 3.11.1 Vent pipe (2) 3.11.2 Gully (2) [30]



QUESTION 4: MATERIALS AND QUANTITIES 4.1 Make neat sketches to illustrate the following steel profiles: 4.1.1 Angle iron (2) 4.1.2 Channel iron (2) 4.1.3 H-beam (2) 4.2 Name FIVE properties of coal tar creosote for wood preservation. (5 x 1) (5) 4.3 Describe the purpose of wood preservation. (2) 4.4 Briefly motivate why aluminium window frames will be used in constructions

near the coast. (1) 4.5 What is the disadvantage of ferrous metals? (1) 4.6 Briefly motivate why a designer must know the properties of metals when

designing structures. (2) 4.7 Name FIVE properties of glass. (5 x 1) (5) 4.8 Briefly describe the manufacturing process of mirrors. (4) 4.9 A quantity list consists of four columns.

Name the columns A, B, C and D. (4)

[30]



QUESTION 5: APPLIED MECHANICS 5.1 FIGURE 5.1 shows a beam which is supported by supports A and B.

Calculate the reaction force of support A and B.

(10) FIGURE 5.1 5.2 FIGURE 5.2 on sheet A shows a frame structure with pointed loads.

Complete the following on sheet A: 5.2.1 The force diagram on scale 1 N = 1 mm (8) 5.2.2 The table by indicating the size and nature of the forces (8) 5.3 FIGURE 5.3 shows a beam with pointed loads. Calculate the bending

moment values of point a to d. (4)

FIGURE 5.3 [30]



QUESTION 6: GRAPHICS AND COMMUNICATION 6.1 SHEET C indicates the natural ground level for a section view through a

wall construction with a window. Use SHEET C and draw to scale 1 : 50 the section drawing of one wall construction of a dwelling. The following information must be indicated:

6.1.1 Scale 1 : 50 (2) 6.1.2 600 mm x 200 mm concrete foundation with the concrete symbol (3) 6.1.3 Undisturbed ground symbol (1) 6.1.4 Foundation wall (1) 6.1.5 100 mm Ground filling with the symbol (2) 6.1.6 100 mm Concrete floor with the symbol (2) 6.1.7 Damp-proof layer under the floor (1) 6.1.8 Cavity wall with hatching (3) 6.1.9 Damp proof layer in the cavity wall (2) 6.1.10 2,6 m Wall height from floor level to the ceiling (1) 6.1.11 Window sill (1) 6.1.12 900 mm window (1) 6.1.13 Window lintel (1) 6.1.14 Window damp-proof layer (1) 6.1.15 Beam filling (1) 6.1.16 114 x 38 mm Wall plate (1) 6.1.17 114 mm Tie beam and rafter with a 30º roof pitch (2) 6.1.18 Bottom two 38 x 38 mm purlines with tiles (2) 6.1.19 Line work and neatness (2) 6.2 Make neat sketches to illustrate each of the following symbols: 6.2.1 Inner door (2) 6.2.2 Stairs (2) 6.2.3 Wall light (2) 6.2.4 Fluorescent light single (2) 6.2.5 Manhole (2) [40] TOTAL: 200



ANSWER SHEET ANTWOORDBLAD A

CIVIL TECHNOLOGY SIVIELE TEGNOLOGIE

NAME: NAAM:

QUESTION/VRAAG 5.2 (16)

SCALE/SKAAL: 1 N = 1 mm

PART/DEEL STRUT/STUT TIE/STANG AF BG CH DI EI EF FG GH HI (4)

a



ANSWER SHEET ANTWOORDBLAD B


NAME: NAAM:


Correct scale 2 Foundation + Symbol 3 Undisturbed ground symbol 1 Foundation wall 1 Ground filling symbol 2 Concrete floor + Symbol 2 Floor DPC 1 Cavity wall + Hatching 3 Wall DPC 2 Wall height 1 Window sill 1 Window 1 Window lintel 1 Window DPC 1 Beam filling 1 Wall plate 1 Tie beam + Rafter 2 Purlines 2 Line work/Neatness 2 TOTAL 30

NATURAL GROUND LEVEL

SECTION ELEVATION

SCALE 1:50



FORMULA SHEET

IMPORTANT ABBREVIATIONS

SYMBOL DESCRIPTION SYMBOL DESCRIPTION SYMBOL DESCRIPTION

G Centre of gravity h Height d Diameter C Centroid b Breadth/Width r Radius L Length s Side A Area 𝜋 Pi = 22

7 = 3,142 ∅ Diameter V Volume FORMULAS

AREA OF FORMULA (in words)

FORMULA (in symbols)

FORMULA FOR THE POSITION OF CENTROIDS

X-axis Y-axis Square Length x Breadth I x b 𝑏

2 𝑏2

Rectangle Length x Breadth I x b I2

𝑏2

Right-angled triangle ½ x base x height ½b x h 𝑏

3 ℎ3

Equilateral triangle/ Pyramid ½ x base x height ½b x h 𝑏

2 ℎ3

Circle 𝜋 x radius x radius 𝜋𝑟2

Centroid is in the centre Circle 𝜋 x diameter x diameter divided by 4

𝜋𝑑2

4

Semi-circle 𝜋 x radius x radius divided by 2

𝜋𝑟2

2

Centroid is 0,424r on the centre line

Position of centroid = (A1 x d) + (A2 x d)

Total area

NATIONAL SENIOR CERTIFICATE

GRADE 11

NOVEMBER 2015

CIVIL TECHNOLOGY MEMORANDUM

MARKS: 200

This memorandum consists of 9 pages.



QUESTION 1: CONSTRUCTION PROCESSES 1.1 1.1.1 Resist tensile force (1) 1.1.2 Resist compressive force (1) 1.1.3 Resist shear force (1) 1.1.4 Bind main bars

Resist shear force (2 x 1) (2) 1.2 Supply the steel supplier (1) the drawing/shape code (2) for sizes/bending of

the bar. (2) 1.3 (1) Are the correct (2) bars/shapes used

(1) Are the bars (2) the correct thickness (1) Are the bars (2) fixed as prescribed (1) Are the correct spacers used for (2) the specified concrete cover (1) Check that at least two stirrups (2) cross the failure/shear line (1) Angles of the shear bar must (2) cross the failure line at 45º. (Any 4 x 2) (8)

1.4 Downward load (1) 1.5 Last longer than wood

Can be used over and over Obtains a smooth surface (Any 2 x 1) (2)

1.6 1.6.1 Tie (1) 1.6.2 Strut (1) 1.6.3 Bearer (1) 1.6.4 Brace (1) 1.6.5 Prop (1) 1.6.6 Sole plate (1) 1.7 (1) Steel is tensioned in the formwork, (2) then the concrete is cast. (3) When

the concrete has hardened, the steel is released from the tension. (3) 1.8 Time-saving

Mechanisation during manufacturing Do not use space and resources on site Manufactured under controlled conditions (Any 3 x 1) (3)

[30] QUESTION 2: ADVANCED CONSTRUCTION PROCESSES 2.1 2.1.1 FIVE brick layers (1) 2.1.2 Stretcher bond (1) 2.1.3 Dead end at the left hand-side (1) 2.1.4 Raking back at the right hand-side (2)

2.2 (1) Set building lines from corner to corner (2) to build brick work on an even (2)



height/straight. 2.3 (1) Roof trusses are fixed on it (2) to spread the load of the trusses evenly. (2) 2.4 2.4.1 TRUE (1) 2.4.2 TRUE (1) 2.3.3 FALSE (1) 2.4.4 FALSE (1) 2.4.5 FALSE (1) 2.5 Any similar answer:

(1) Damp penetrates through the outer wall and runs down to the DPC (2) and must then run out at the weep-holes to prevent damming. (Any 2 x 1) (2)

2.6 It relies on:

(1) mass and (2) interlocking/friction to perform the retaining function. (2) 2.7 2.7.1 Offers an open working space underneath the shoring. (1) 2.7.2 Any FIVE factors which will influence the type of design for the shoring.

Nature of the soil Depth of the excavation Weather conditions Duration of project Presence of water in soil Availability of material Cost Individual preference (Any 5 x 1) (5)

2.7.3 2.7.A – Shutter board

2.7.B – Strut (2) 2.8 2.8.1 Level (1) 2.8.2 Hand hawk (1) 2.8.3 Granolithic groover (1) 2.8.4 Block brush (1) 2.8.5 Electric router (1) 2.9 Any THREE safety measures:

(1) Cutter blocks should be (2) covered with a machine guard (1) Beware of kick-backs, (2) stand aside the machine (1) Avoid timber with (2) too many knots (1) Avoid timber which is (2) wrapped and twisted too much (Any 3 x 2) (6)

2.10 Any THREE measures:

Keep neck straight/not bent Move patient as little as possible Move patient as a unit When doing rescue breathing, pull the jaw forward – do not bend the neck (Any 3 x 1) (3)

[40]



QUESTION 3: CIVIL SERVICES 3.1 (1) Controls the incoming water supply (2) by reducing it to an acceptable

pressure and (3) forwarding a constant downstream pressure into the installation. (3)

3.2 Vacuum breaker (1) 3.3 (1) To catch water leaks/drained water (2) and lead it outside/not to damage

the ceiling. (2) 3.4 3.4.1 FALSE (1) 3.4.2 TRUE (1) 3.4.3 FALSE (1) 3.4.4 FALSE (1) 3.4.5 TRUE (1) 3.4.6 FALSE (1) 3.5 (1) Controls the water level (2) in water closets/water tanks. (2) 3.6 Any FOUR:

Where two or more drain lines converge Where the main drain changes direction Within 1,5 m of the servitude boundary before the main public sewer connection Every 25 m (Any 4 x 1) (4)

3.7 Access opening/Cleaning (1) 3.8 (1) Prevent blockages (2) at change in direction. (2) 3.9

(4) 3.10 1 : 60 (1) 3.11 3.11.1

(2) 3.11.2

(2) [30]



QUESTION 4: MATERIALS AND QUANTITIES 4.1 4.1.1

(2) 4.1.2

(2) 4.1.3

(2) 4.2 Any FIVE properties:

Oily; Dark colour; Durable; Resistance to leaching of water; Does not cause corrosion of metals in wood; Does not change the dimensions of the timber; Timber treated with it cannot be painted; Offensive smell; Only for exterior use (Any 5 x 1) (5)

4.3 (1) To protect wood against (2) rotting/pests/insect bores, etc. (Any 2 x 1) (2) 4.4 Aluminium is resistant to corrosion. (1) 4.5 Corrosion (1) 4.6 (1) Designer can then choose the correct material (2) for the specific work. (2) 4.7 Any FIVE properties of glass.

Solid and hard Disordered and amorphous structure Fragile Transparent Biologically inactive 100% recyclable Does not fade, corrode, stain or deteriorate (Any 5 x 1) (5)

4.8 (1) Silver metal coating is (2) applied to a flat glass surface. The silver

coating is covered with (3) a layer of copper and (4) a base paint. (4) 4.9 A – Multiplication column

B – Measurement column C – Result column D – Description column (4)

[30]



QUESTION 5: APPLIED MECHANICS 5.1

Around A Around B L.O.M. = R.O.M R.O.M. = L.O.M. Bx8 = (60x3)+(20x8) (Ax8) = (60x5)+(10x8) B6 = 180 + 160 A6 = 300 + 80 B = 340 A = 380 = 8 8 = 42,5 N = 47,5 N (10) 5.2 FIGURE 5.2 on sheet A shows a frame structure with pointed loads. Complete

the following on sheet A: 5.2.1 The force diagram on scale 1 N = 1 mm (8) 5.2.2 The table by indicating the size and nature of the forces (8) 5.3

FIGURE 5.3 a = 0

b = (60x2) + (-20x2) = 80 N c = (60x6) + (-20x6) + (-70x4) = -40 N d = (-10x8)+(-40x6)+(60x6)+(-20x2) = 0 (4)

[30]



QUESTION 6: GRAPHICS AND COMMUNICATION 6.1 SHEET C indicates the natural ground level for a section view through a wall

construction with a window. Use SHEET C and draw to scale 1 : 50 the section drawing of one wall construction of a dwelling. The following information must be indicated:

6.1.1 Scale 1 : 50 (2)

6.1.2 600 mm x 200 mm concrete foundation with the concrete symbol (3)

6.1.3 Undisturbed ground symbol (1)

6.1.4 Foundation wall (1)

6.1.5 100 mm Ground filling with the symbol (2)

6.1.6 100 mm Concrete floor with the symbol (2)

6.1.7 Damp-proof layer under the floor (1)

6.1.8 Cavity wall with hatching (3)

6.1.9 Damp proof layer in the cavity wall (2)

6.1.10 2,6 m Wall height from floor level to the ceiling (1)

6.1.11 Window sill (1)

6.1.12 900 mm window (1)

6.1.13 Window lintel (1)

6.1.14 Window damp-proof layer (1)

6.1.15 Beam filling (1)

6.1.16 114 x 38 mm Wall plate (1)

6.1.17 114 mm Tie beam and rafter with a 30º roof pitch (2)

6.1.18 Bottom two 38 x 38 mm purlines with tiles (2)

6.1.19 Line work and neatness (2)

6.2 Make neat sketches to illustrate each of the following symbols:

6.2.1

(2)

6.2.2 (2)

6.2.3

(2)

6.2.4

(2)

6.2.5

(2) [40] TOTAL: 200



ANSWER SHEET ANTWOORDBLAD A


NAME: NAAM: Memorandum


SCALE/SKAAL: 1 N = 1 mm

PART/DEEL STRUT/STUT TIE/STANG AF 118 N BG 80 N CH 80 N DI 118 N EI 102 N EF 102 N FG 39 N GH 40 N HI 39 N (4)

a



ANSWER SHEET ANTWOORDBLAD B


NAME: NAAM: Memorandum


Correct scale 2 Foundation + Symbol 3 Undisturbed ground symbol 1 Foundation wall 1 Ground filling symbol 2 Concrete floor + Symbol 2 Floor DPC 1 Cavity wall + Hatching 3 Wall DPC 2 Wall height 1 Window sill 1 Window 1 Window lintel 1 Window DPC 1 Beam filling 1 Wall plate 1 Tie beam + Rafter 2 Purlines 2 Line work/Neatness 2

TOTAL 30 NATURAL GROUND LEVEL

SECTION ELEVATION

SCALE 1:50

Documents

GRADE 11 NOVEMBER 2015 CIVIL TECHNOLOGY - Best …€¦ · GRADE 11 NOVEMBER 2015 CIVIL TECHNOLOGY ... 1.3 Describe FOUR aspects of mounted steel reinforcement which ... 3.4.4 Traps