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5.1 FIGURE 5.1 below shows a pre-fabricated surface channel A and concrete shoe B - NSC Civil Technology Civil Services - Question 5 - 2022 - Paper 1
Question 5
5.1 FIGURE 5.1 below shows a pre-fabricated surface channel A and concrete shoe B. 5.1.1 Explain why reinforced concrete is preferred in the manufacturing of A. 5.... show full transcript
Worked Solution & Example Answer:5.1 FIGURE 5.1 below shows a pre-fabricated surface channel A and concrete shoe B - NSC Civil Technology Civil Services - Question 5 - 2022 - Paper 1
Step 1
5.1.1 Explain why reinforced concrete is preferred in the manufacturing of A.
Answer
Reinforced concrete is favored in the manufacturing of pre-fabricated surface channel A for several reasons:
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Strength: Reinforced concrete is stronger than mass concrete, allowing it to bear heavier loads and resist wear over time.
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Durability: It withstands significant forces from water flow, making it ideal for channels that often deal with heavy rainfall or liquid transport.
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Hydraulic Efficiency: Reinforced concrete is designed to handle large volumes of water flow efficiently, preventing overflow and reducing the risk of structural damage.
Step 2
5.1.2 Describe the logic for having a fall/slope when positioning B.
Answer
The concrete shoe B must be positioned with a fall or slope to ensure:
- Water Drainage: It facilitates the effective drainage of water away from the building, preventing water accumulation that could lead to structural damage.
- Preventing Water Damage: A correct slope minimizes the risk of water pooling, which can cause erosion or deterioration of the concrete over time.
Step 3
5.2 Use this answer sheet and complete the fascia board, gutter and downpipe installation.
Answer
In constructing the roof's fascia board, gutter, and downpipe, the following elements are essential:
- Fascia Board: Begin by sketching the fascia board, ensuring it's connected securely to the roof structure.
- Square Gutter: Draw the square gutter, integrating it with clip supports and ensuring correct alignment with the fascia board's edge.
- Gutter Clip: Indicate the gutter clips that secure the gutter in place.
- Offset: Create an offset at the point where the gutter transitions to the downpipe for proper angle and flow.
- Downpipe: Position the downpipe with a smooth transition from the gutter, ensuring it directs water away from the building's foundation.
- Holder Bats: Include holder bats that support the downpipe placement.
- Rainwater Shoe: Finally, show the rainwater shoe connection at the base of the downpipe to guide water efficiently into drainage.
Step 4
5.3 Use the drawing and the information to draw the development of pipe A.
Answer
To develop pipe A, follow these steps:
- Dividing the Circle: Divide the circle of the auxiliary view into 12 equal parts to determine measurement points for development.
- Projection Lines: From each division, project vertical lines downward to establish the length of each section in the development.
- Drawing the Development: Considering the pipe's diameter and curved nature, construct the development layout resulting in a flat pattern that maintains accurate proportions for each segment.
- 3 mm Seam: Ensure to include the 3 mm seam on both sides of the development, as this is essential for proper assembly.
- Final Touches: Clearly label all lines, including construction lines, to enhance understanding and facilitate accurate assembly.