Design a Vertical Alignment of the Center Line of the Road - Engineering Assignment Help

Assignment Task

Plan Provided

The plan provided has a contour interval of 5m. You must find the scale of your plan as with the variety of printers every plan will be individual. As well as the bar scale showing 100m, there are three surveyed lines, for which precise horizontal distances are known and are shown on the plan. Measure each of the four lines in mm and show these measurements in your answer sheet. Using the given (true horizontal) distances, compute the scale of your plan and state this in the answer sheet.

Assume that the contours are correct with 90% confidence.

Horizontal Alignment

The first straight is shown in red and the first Intersection Point (IP) must be at the end of the red line. You must draw ONLY TWO (2) more straights to complete the road alignment. These straights must allow the road to be designed to meet the requirements of the vertical design as listed below.

Use a protractor to find the bearing of the first straight and then measure the deflection angle for each curve to the nearest degree. Use Tucker’s Rd with its bearing of 0o, as your azimuth. Using your measured angles, calculate the bearings of each straight.

Scale the distances from Tucker’s Rd to IP1, IP1 to IP2 and IP2 to the End, in mm and using your scale factor found above, calculate the distance in metres. ROUND THIS DISTANCE OFF TO THE NEAREST METRE. As this is a preliminary design, and also to simplify the calculations, the bearings and distances of each straight are to be adopted as, and quoted to, the nearest degree and nearest metre in your answer sheet. (You are the design engineer and so can make life easy for yourself by making this decision about the straights. While you can make this decision arbitrarily, after that everything must be calculated mathematically and accurately – no more ‘rounding off’ must be done.)

Each horizontal curve is to have radius of 62m. Calculate the tangent distance and arc length for each curve and show them in the table of answers. Calculate the chainages of each of the four horizontal curve T.P.s and the end of the road, and any other points listed, and show them all in the table of answers.

On your plan, plot each curve. (Calculating the external distance will give you a third point to help you draw the curve freehand.) Also clearly show the lengths of each straight (IP - IP) and the bearing of that straight.

Please calculate the data needed to set out each horizontal curve from its first T.P. by deflection angles and long chords. The points to be set out are, the Crown of the curve and the second T.P. Also, if the arc length of the curve is less than 40m, points at running chainage of every 10m along the road must be set out (i.e., 120, 130 etc). If the

arc length is 40m or more please give the data to set out points at running chainages of 20m intervals (i.e. 360, 380, 400 etc.) within that curve.

Vertical Alignment

Using the contours on the map provided, draw a longsection of the Centre Line of your road at scales; horizontal 1:2,000 and vertical 1:200. (Please read the submission section for detailed guidance about drawing the longsection.)

Design a vertical alignment of the centre line of the road showing grades and vertical curves. The vertical alignment must meet the following criteria:

The road must start at RL 15.90 and must finish at exactly RL 32.50 at the chainage you have calculated as being the end of the road. The final grade of your road into the parking site must be between +2.0% and +0.5%. The maximum grade allowed at any point along the road is 10%.

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