Name the maximum thickness of soil layers when compaction is done by hand - NSC Civil Technology Civil Services - Question 4 - 2023 - Paper 1
Question 4
Name the maximum thickness of soil layers when compaction is done by hand.
3.2 Explain how the lid of a concrete ring manhole deeper than 750 mm should be set to en... show full transcript
Worked Solution & Example Answer:Name the maximum thickness of soil layers when compaction is done by hand - NSC Civil Technology Civil Services - Question 4 - 2023 - Paper 1
Step 1
Maximum thickness of soil layers when compaction is done by hand
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Answer
The maximum thickness of soil layers when compaction is done by hand is typically 300 mm.
Step 2
Explain how the lid of a concrete ring manhole deeper than 750 mm should be set to ensure airtightness
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Answer
The lid of a concrete ring manhole deeper than 750 mm should be set with a rubber gasket or seal to prevent water ingress and ensure airtightness. It must also be securely fastened to prevent movement.
Step 3
Name the length of the engineered bricks that are used in manhole construction
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Answer
The length of the engineered bricks used in manhole construction is typically 200 mm.
Step 4
Draw a two-dimensional sketch to show how the sides of excavations in loose and water-logged soil should be supported
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Answer
To support the sides of excavations in loose and water-logged soil, use timber or steel sheeting driven into the ground to provide lateral support. This prevents soil collapse and ensures worker safety.
Step 5
Name the tool and accessory that can be used to test if the slope of a drain pipe is correct over a short distance
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Answer
A spirit level is used along with a measuring rod to check if the slope of a drain pipe is correct over a short distance.
Step 6
Who must monitor the free end of the rope attached to the safety harness of the worker?
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The site supervisor or a designated safety officer must monitor the free end of the rope attached to the safety harness of the worker.
Step 7
Explain TWO safety precautionary measures that must be taken before a worker enters a confined space to work
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Answer
Atmospheric testing must be conducted to ensure that the air quality is safe for breathing, checking for hazardous gases.
A rescue plan must be in place, including the availability of rescue personnel and equipment.
Step 8
State TWO regulations that must be adhered to when working in elevated places
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Workers must use fall protection equipment such as harnesses and guardrails.
Regular inspections of scaffolding and platforms must be conducted to ensure safety compliance.
Step 9
The volume of the tank in m³
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Answer
To calculate the volume of the cubic tank:
tank volume = side length³ = (3.7 m)³ = 50.953 m³.
Step 10
The volume of the tank in litres
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Answer
To convert the volume from cubic meters to litres:
tank volume in litres = 50.953 m³ × 1000 = 50953 litres.
