Learn free civil engineering by civilustaad about CIRCULAR CURVES IN SURVEYING

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Learn free civil engineering by civilustaad about CIRCULAR CURVES IN SURVEYING

In the geometric intend of motorways, railways, pipelines, etc., the plan and setting out of curves is a vital aspect of the engineer’s occupation. The preliminary design is typically based on a succession of straight sections whose positions are defined mainly by the geography of the area. The intersections of pairs of straights are then linked by horizontal curves.

                              

In the vertical design, intersecting gradients are linked by curves in the vertical plane.

                                               

Circular curves are used to link intersecting straight lines (or tangents). Circular curves are implicit to be concave. Horizontal circular curves are used to transition the alter in alignment at angle points in the tangent (straight) portions of alignments. An angle point is called a point of intersection or PI station; and, the change in alignment is definite by a deflection angle, Δ.

                                  

Types of Circular Curves are:

Simple Curve

Compound Curves

Reverse Curves

Broken Back Curves