Linear Methods of Setting Out Curves - Horizontal Curve - Surveying-II | Summary and Q&A

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April 4, 2022
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Linear Methods of Setting Out Curves - Horizontal Curve - Surveying-II

TL;DR

This video explains the linear method of setting out curves using offsets from the long chord, providing formulas and procedures for accurate curve setting.

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Key Insights

  • 😒 The linear method of setting out curves uses offsets from the long chord for precise curve positioning.
  • 😥 Tangent points T1 and T2, the long chord length, and offsets such as O0 and OX play crucial roles in the process.
  • ❓ Formulas are provided to calculate O0 and OX, depending on the radius of the curve and distance from the center.

Questions & Answers

Q: What is the linear method of setting out curves?

The linear method involves using offsets from the long chord to accurately position points along a curve. It allows for precise curve setting using chains and tape for measurements.

Q: How are tangent points determined in the linear method?

Tangent points T1 and T2 are established based on the length of the tangent at point B and the change of bearing from point A to point B. The offset at the midpoint of T1 and T2 is known as the "verse sine."

Q: How is the center point of the curve determined?

The center point, labeled O, is established using the length of the long chord T1T2. This point is essential for calculating offsets and setting the curve.

Q: What is the formula for calculating OX offsets?

The formula for OX offsets depends on the distance x from the center point E and the radius of the curve. It is given as OX = √(r^2 - x^2) - (r - O0).

Summary & Key Takeaways

  • The linear method of setting out curves involves using offsets or ordinates from the long chord of the curve.

  • Tangents T1 and T2, the long chord, and various offsets such as O0 and OX are crucial parameters in curve setting.

  • Formulas are provided to calculate O0 and OX, and the procedure involves setting tangent points, establishing a center, and determining offset coordinates.

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