Vertical curve.

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Presentation transcript:

Vertical curve

Introduction For highway and railway wherever there is a change of grade in the vertical plane, a vertical curve is required to smoothen the change . It is usually parabolic as parabolic curves provide a constant rate of change of grade.

Introduction There are four types of vertical curve: (a) Sag curve, (b) Crest curve, (c) Rising curve, and (d) Falling curve

Example A +3.5% grade meets a -1.5% grade at station 18+15 and elevation of 250 m. an equal tangent parabolic curve of 300 m long has been selected to join the two tangents. Compute and tabulate the curve for stakeout at full stations. Assume 30 m chain.