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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
Step 2
Explain how the lid of a concrete ring manhole deeper than 750 mm should be set to ensure air-tightness.
Answer
The lid of a concrete ring manhole deeper than 750 mm should be set with a gasket or seal that fills the gap between the lid and the manhole ring. This ensures air-tightness by preventing air and gas ingress. Proper installation techniques and the use of appropriate sealants also contribute to maintaining air-tightness.
Step 3
Step 4
Draw a two-dimensional sketch to show how the sides of excavations in loose and water-logged soil should be supported.
Answer
To support the sides of excavations in loose and water-logged soil, a two-dimensional sketch should illustrate the use of timber shoring or trench boxes. These supports are placed vertically against the soil to prevent collapse and are designed to withstand the lateral pressure of the surrounding soil.
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.
Answer
A level or a laser level can be used to test if the slope of a drain pipe is correct over a short distance. These tools help ensure that the pipe has the required slope for effective drainage.
Step 6
Who must monitor the free end of the rope attached to the safety harness of the worker?
Answer
A competent person, often referred to as a safety officer or a supervisor, must monitor the free end of the rope attached to the safety harness of the worker to ensure safe operations while working at heights.
Step 7
Explain TWO safety precautionary measures that must be taken before a worker enters a confined space to work.
Answer
- Atmospheric Testing: Before entry, the atmosphere within the confined space must be tested for hazardous gases, oxygen levels, and the presence of toxic substances.
- Safety Plan: A comprehensive safety plan should be established that includes rescue procedures and the availability of necessary safety equipment such as harnesses and safety lines.
Step 8
State TWO regulations that must be adhered to when working in elevated places.
Answer
- Use of Personal Protective Equipment (PPE): Workers must wear appropriate PPE, including helmets, harnesses, and non-slip footwear.
- Fall Protection Regulations: Adherence to regulations regarding the use of guardrails, safety nets, or personal fall arrest systems to prevent falls from heights.
Step 9
Step 10
Step 11
Draw a two-dimensional sketch to show the top view of a one-brick wall built in English bond.
Answer
In your two-dimensional sketch, illustrate a one-brick wall in English bond. This will show bricks laid in a staggered pattern with alternate courses offset by half a brick to achieve structural integrity.