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3.1 Change the underlined word(s) in the following to make the statements correct - NSC Civil Technology Civil Services - Question 3 - 2024 - Paper 1

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3.1 Change the underlined word(s) in the following to make the statements correct. Write the appropriate word(s) next to the question numbers (3.1.1 to 3.1.5) in the... show full transcript

Worked Solution & Example Answer:3.1 Change the underlined word(s) in the following to make the statements correct - NSC Civil Technology Civil Services - Question 3 - 2024 - Paper 1

Step 1

Change the underlined word(s)

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Answer

3.1.1 The slope at which a 225 mm diameter pipe should be laid is 1 : 60.

3.1.2 The recommended thickness of layers for backfilling is 150 mm.

3.1.3 The OSS specifies that all excavation work should be carried out under OHSA.

3.1.4 At excavations, Orange/Red warning signals must be visible at all times.

3.1.5 When the soil is Loose/Waterlogged, the vertical members of shoring should be placed very close together.

Step 2

Explain the process of soil compaction

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Answer

Soil compaction is the process of increasing the density of soil by pressing the soil particles closer together. This process helps to improve the load-bearing capacity of the soil, which is crucial for construction stability.

Step 3

Describe TWO precautionary measures

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Answer

  1. The sides of the excavation must be properly supported. This ensures that the walls of the excavation do not collapse, preventing accidents.

  2. The supervisor must ensure that no load, material, or heavy machinery is placed near the edge of any excavation. This minimizes the risk of tipping or falling into the trench, which could be dangerous.

Step 4

Take off the quantities of materials needed

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Answer

3.4.1 Shower rose 3.4.2 Cross linked polyethylene pipe 3.4.3 Copper 3.4.4 Pex-pipe 3.4.5 Hot-water pipe 3.4.6 Mixer tap 3.4.7 Chrome/Brass 3.4.8 90° Elbow

Step 5

Calculate the fall of the drainpipe between points A and B

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Answer

The length of the pipe = 5000 mm Fall of drainpipe = ( \frac{1}{60} \times 5000 ) Fall = 83.3 mm or 0.083 m

Step 6

Name TWO tools

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Answer

  1. Spirit level
  2. Dumpy level

Step 7

Name ONE method that forms part of a temporary structure

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Answer

Polling boards/Strut/Walling boards are common temporary structures used to support excavations.

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