Photo AI
The image on the right shows the newly opened Crossrail train station in London's docklands area - Leaving Cert DCG - Question C-2 - 2018
Question C-2
The image on the right shows the newly opened Crossrail train station in London's docklands area. The structure is based on a parabola and has been shaped as shown. ... show full transcript
Worked Solution & Example Answer:The image on the right shows the newly opened Crossrail train station in London's docklands area - Leaving Cert DCG - Question C-2 - 2018
Step 1
Draw the given elevation. The vertex of the parabolic curve ABC is located at B.
Answer
To draw the elevation:
-
Base of Structure: Start by outlining the base of the structure using a horizontal line. Ensure the width corresponds to the dimensions shown in the figure.
-
Inner Stand Section: Next, draw the inner stand section above the base line, making sure it aligns with the provided dimensions of 110 and 120mm. This section should have a consistent thickness.
-
Division of RHS for Parabola: Divide the right-hand side of the parabola into equal sections to ensure a symmetrical curve. Use evenly spaced marks to represent the curve accurately.
-
Right Hand Curve: Sketch the right-hand side of the parabolic curve. Ensure the curve peaks at point B, the vertex, which should be aligned vertically with the base.
-
Locate Points on LHS for Parabola: Replicate symmetrical points on the left-hand side of the parabola corresponding to the right hand drawn portions.
-
Draw Curve on Left Side: Finally, connect these points smoothly to complete the left side of the parabolic curve.
Step 2
Draw the given end view.
Answer
To draw the end view:
-
Base of Structure: Outline the rectangular structure's base according to the dimensions given in the figure's end view.
-
Draw Roof Section: Sketch the roof's angled section, ensuring it meets the endpoints of the base accurately.
-
Construction to Locate 90° Angle: Construct a right angle at point B to maintain the proper orientation as shown in the figure. Use a compass or set square for precision.
-
Complete the End View: Add necessary details such as horizontal and vertical lines to finalize the end view of the structure.
Step 3
Project the given plan, clearly showing how the points on the curve are located.
Answer
To project the given plan:
-
Projections from Elevation: Start by transferring the details from the elevation plan onto the projection. Use vertical lines from significant points on the elevation to the plan view.
-
Projections from End View: Draw additional lines from the end view to intersect the projected points on the plan. This will help in accurate positioning of the structure's features.
-
Draw Rectangular Base Section: Mark the rectangular base in the plan using the projected lines, ensuring that it matches the previously drawn base structure.
-
Locate Extremities of Curved Section: Identify the extremities of the parabolic section in the plan, accurately showing where the curve starts and ends.
-
Locate Remaining Points on Curved Section: Continue by plotting the remaining points of the parabolic curve using the points derived from both elevation and end views.
-
Draw Curve: Connect the plotted points with a smooth curve to represent the parabolic shape accurately.
-
Complete Plan: Finally, ensure that all details are included and labeled in the plan view, and double-check precision.