- I Tutorial 1 Curves A A Horizontal Grade Meets A 3 5 Grade At 3035 Meter Chainage And 218 905m Elevation A Vertical 1 (186.35 KiB) Viewed 20 times
i. Tutorial 1 Curves a A horizontal grade meets a -3.5% grade at 3035 meter chainage and 218.905m elevation. A vertical curve of 26 meter length with 4 meter peg intervals is to be introduced. Calculate the necessary elevations on the curve. b. A parabolic vertical curve is to be set out connecting two uniform grades of +1.8 and +3.9%. The chainage and reduced level of point of intersection are 2705m and 238.755m respectively. The rate of change of grade is 0.05% per chain of 20m. Calculate the reduced level of the various station pegs. C A parabolic vertical curve is to be set out connecting two uniform grades of +2.8 and +4.9%. The chainage and reduced level of point of intersection are 5+000m and 238.755m respectively. The rate of change of grade is 0.05% per chain of 20m. Calculate the reduced level of the various station pegs. d. Two tangents intersect at chainage 6+980, the deflection angles being 48°30'. Calculate the necessary data for setting out a curve of 15m chains radius to connect the two tangents if it is intended to set out the curve by offsets from chords. Take peg interval equal to 100 links, length of the chain being equal to 20m. e. Siddhartha highway has a curve of 625 m radius is to be set out connect two straights. The maximum speed of the moving vehicles on this curve is restricted to 90km/hr. Transition curves are to be introduced at each end of curve. Calculate a) length of transition b) shift of circular curve c) chainage of the beginning and end of curve d) tangential off set of first junction point. Take peg interval 20m in circular curve and 10m in transition curve, angle of intersection 100°24' f. In a road alignment a grade of -1% is followed by +0.5%. The chainage and RL of the intersection point are 400m and 350m respectively. The rate of change of grade is 0.1% per 20m. Calculate the necessary data for setting out the vertical curve. g. Two tangents intersect at chainage 6+980, the deflection angles being 48°30'. Calculate the necessary data for setting out a curve of 15m chains radius to connect the two tangents if it is intended to set out the curve by offsets from chords. Take peg interval equal to 100 links, length of the chain being equal to 20m. h. A parabolic vertical curve is to be set out connecting two uniform grades of +0.8 and -0.9%. The chainage and reduced level of point of intersection are 1664m. and 238.755m respectively. The rate of change of grade is 0.05% per chain of 20m. Calculate the reduced level of the various station pegs. Two straight lines AC and CB to be connected by a 3 degree curve, intersect at a chainage of 2760m. The WCBs of AC and CB are 45°30' and 75°30' respectively. Calculate all necessary data for setting out curve by the method of offsets from the long chord. j. Two straight lines AB and BC intersect at a chainage of 510.23m, the angle of intersection being 126°48'. The radius of the curve is 300m. Calculate all the necessary for setting out the curve by the method of offsets from the chord produced. Assume a peg interval of 30m. A road bend which deflects 80° is to be designed for a maximum speed of 120 kmph, maximum centrifugal ratio of % and a maximum rate of change of acceleration of 30 cm/sec), the curve consisting of a circular arc combined with two cubic parabola. Calculate i) the radius of the circular arc. li) the requisite the length of transition iii) the total length of composite curve. iv) prepare setting out tables for both transition and circular curve at peg interval of 30 m by offset and deflection angle method. V) explain the field procedure how setting out table is carried in field