CLASSIFICATION OF CURVES
Most types of transportation routes, such as highways, railroads, and pipelines, are connected by curves in both horizontal and vertical planes.
Horizontal Curves: Curves used in horizontal planes to connect two straight tangent sections.
Two types of horizontal cures:
Circular arcs, and
Spirals
Simple Curve: A circular arc connecting two tangents.
Compound Curve: Two or more circular arcs of different radii tangent to each other.
Broken-back Curve: Combination of a short length of tangent connecting two circular arcs that have centers on the same side.
Reverse Curve: Two circular arcs tangent to each other, with their centers on opposite side of the alignment.
Circular curves are further classified as :
View AnswerSimple Curves.
Compound Curves.
Serpentine Curves.
Deviation Curves.
1. Simple Curve:
A simple curve Consists of a single arc of circle connecting two straights. It has radius of the same magnitude throughout.
2. Compound Curves.
A compound Curve consists of two or more simple curves having different radii bending in the same direction and lying on the same side of the common tangent. Their centres lie on the same side of the curve.
3. Reverse or serpentine curve
A reverse or serpentine curve is made up of two arcs having equal or different radii bending in opposite direction with a common tangent at their junction . Their centres lie on opposite sides of the curve. Reverse curves are used when the straights are parallel or intersect at a very small angle.
4. Deviation curve
A deviation curve is simply a combination of two reverse curves. it is used when it becomes necessary to deviate from a given straight path in order to avoid intervening obstructions such as bend of river, a building , etc.
They should be avoided as far as possible on main lines and highways where speeds are necessarily high.
1. What is the purpose of setting curves in surveying and leveling? |
2. What are the different types of curves used in surveying and leveling? |
3. How are circular curves defined in surveying and leveling? |
4. What is the method used to set circular curves in surveying and leveling? |
5. How are compound curves different from circular curves in surveying and leveling? |
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