6.1 Various options are given as possible answers to the following questions - NSC Civil Technology Construction - Question 6 - 2023 - Paper 1
Question 6
6.1 Various options are given as possible answers to the following questions. Choose the answer and write only the letter (A–D) next to the question numbers (6.1.1 t... show full transcript
Worked Solution & Example Answer:6.1 Various options are given as possible answers to the following questions - NSC Civil Technology Construction - Question 6 - 2023 - Paper 1
Step 1
6.1.1 Pre-cast piling can be used in ...
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Answer
The correct answer is C: dry areas, as pre-cast piling requires stable conditions for proper installation.
Step 2
6.1.2 The equipment for the installation of piles can be mounted on ...
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Answer
The correct answer is B: cranes, which are typically used for lifting and positioning heavy loads.
Step 3
6.1.3 A ... hammer can be used to drive a pre-cast concrete pile into the ground.
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Answer
The correct answer is D: sledge, which is a type of hammer used in driving piles.
Step 4
6.1.4 A pile foundation is used to ...
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Answer
The correct answer is C: distribute the load across to more stable ground, ensuring stability for structures.
Step 5
6.1.5 ... is not a category of pile foundations.
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Answer
The correct answer is A: Pre-cast concrete piles, as this option generally refers to a different type of foundation.
Step 6
6.2 Draw in your ANSWER BOOK a neat freehand sketch of the concrete plug of an enlarged base when installing driven in-situ piles.
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Begin with sketching the enlarged base, ensuring to clearly indicate the concrete symbol as follows: a filled rectangle for solid concrete.
Step 7
6.3 Name the different components that a rib and block floor consists of.
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Answer
A rib and block floor consists of components like:
Ribs: These are the load-bearing elements.
Blocks: Used to fill the space between ribs.
Reinforcement: Usually steel bars within the ribs.
Step 8
6.4 Predict what could happen if the temporary props are removed a day after the concrete has been cast on the rib and block floor.
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Answer
If the temporary props are removed, the structure may collapse or crack due to insufficient support during the curing process, as the concrete may not have gained adequate strength.
Step 9
6.5 Explain the meaning of these sections in the following code: 4 R 20 03 250
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Answer
In the code:
6.5.1: 4 refers to the number of bars used.
6.5.2: 20 indicates the diameter of the bars in mm.
6.5.3: 250 signifies the spacing of the bars in mm.
Step 10
6.6 Use ANSWER SHEET 6.6 and draw a neat sectional view of the L-shaped reinforced concrete column.
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Answer
Draw a clear sectional view ensuring to label:
8 main bars reinforcing the column.
Stirrups around the main bars to enhance structural integrity.
Indicate the minimum concrete cover necessary for durability.
Step 11
6.7 Use the dimension paper and calculate the volume of the blinding layer.
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Answer
First, calculate the dimensions of the blinding layer:
Length = 7,000 mm (or 7 m)
Width = 6,000 mm (or 6 m)
Thickness = 40 mm (or 0.04 m)
Then, the volume can be calculated with:
V=LimesWimesH=7imes6imes0.04=1.68extm3
