2.2. Two theodolites method

Try these first

1. 1.

   What is the primary purpose of using the Two Theodolites Method?

   Hint

   What challenges does traditional distance measurement face?

2. 2.

   Define a deflection angle.

   Hint

   Think about how angles relate to circular curves.

3. 3.

   What is the purpose of the Two Theodolites Method?

   • To measure land volume
   • To set out curves
   • To calculate distances

   Hint

   Think about the challenges faced in measuring distances in civil works.

4. 4.

   True or False: Deflection angles are used to adjust for straight line measurements.

   • True
   • False

   Hint

   Recall the application of angles in curve settings.

5. 5.

   In setting out a curve with a radius of 100m, if the first deflection angle calculated is 12° and chord length is 30m, what would be the setting for the theodolite at T₁?

   Hint

   Utilize the relationship between angle, radius, and chord lengths to set accurately.

6. 6.

   If the two points established on a curve appear misaligned from the intended design after initial setup, outline the steps to rectify this situation.

   Hint

   Re-evaluating each point’s positioning may clarify the adjustments required.