3.1 What is the main function of a manhole?
3.1.2 Identify A - NSC Civil Technology Civil Services - Question 3 - 2018 - Paper 1
Question 3
3.1 What is the main function of a manhole?
3.1.2 Identify A.
3.1.3 Identify B.
3.1.4 Manholes that are deeper than 750 mm should be set in frames and have grease... show full transcript
Worked Solution & Example Answer:3.1 What is the main function of a manhole?
3.1.2 Identify A - NSC Civil Technology Civil Services - Question 3 - 2018 - Paper 1
Step 1
What is the main function of a manhole?
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Answer
A manhole is a chamber that allows entrance to a drain, providing access to the sewage pipes of a sewage system.
Step 2
Identify A.
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Answer
A refers to the benched area or sloping surface created within the manhole to allow for proper drainage.
Step 3
Identify B.
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Answer
B refers to the pipe channel or open channel that facilitates the flow of wastewater through the manhole.
Step 4
Manholes that are deeper than 750 mm should be set in frames and have greased double seals. Give TWO reasons why greased double seals are installed.
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Answer
To make the manhole airtight and prevent the escape of harmful gases.
To ensure that liquids cannot leak out of the system.
Step 5
State THREE regulations that protect workers during excavations.
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Answer
Excavations must be adequately protected by a fence to ensure safety.
Workers should wear harnesses when entering an excavation trench.
Red warning lights and signs must be placed at regular intervals and be clearly visible.
