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Difficulty: MediumElementary Surveying Instruments and Fieldwork

During a long-distance linear measurement along a proposed road alignment, two survey assistants are conducting a chain survey. At the end of every full chain length laid on the ground, which surveying accessory is driven into the ground by the leader to mark the position and assist in tallying the total distance measured?

  1. Marking arrowsAnswer
  2. B
    Wooden pegs
  3. C
    Ranging poles
  4. D
    Offset rods

Answer

Marking arrows are used by the leader at the end of each full chain length to mark the spot and keep count of the distance measured.
Marking arrows (chaining pins) are small steel wire pins used during chain surveying. The leader carries a bundle of arrows and inserts one into the ground at the end of every full chain length. As the survey progresses, the follower picks them up. The number of arrows collected by the follower at any point indicates the exact number of full chain lengths measured.

Step-by-Step Solution

1
Identify the fieldwork process described
The process described is measuring a continuous long distance along a line using a chain, involving a follower and a leader.
Chain surveying over long distances requires tracking how many full chain lengths have been measured.
2
Analyze the function of each surveying accessory
Marking arrows (chaining pins) are specifically supplied in sets (usually 10) for insertion into the ground at the forward end of each chain length by the leader. The follower collects them as they move forward, providing an exact tally.
Distinguishing between station marking accessories (pegs), alignment accessories (ranging poles), offset accessories (offset rods), and tallying accessories (arrows) is essential for accurate survey procedure.

Key Concept

Fieldwork Accessories and Functions in Chain Surveying
Estimated Time:1m 0s
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Topics

Elementary Surveying Instruments and Fieldwork

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