Field work in Chain surveying | Surveying and Levelling
Earlier, we discussed “Principles of Chain Surveying” and the considerations that are taken for carrying out Chain Surveying… In this article, we will discuss various instruments that are essential for carrying out Chain Surveying.
Here are the steps to be followed for carrying out Chain Surveying:
- Reconnaissance Survey
- Marking stations
- Running survey lines
- Taking offsets
Instruments used in Chain Survey
- Chain, 20m or 30m long
- Tape
- Arrows
- Ranging rods
- Wooden or Iron Pegs
- Plumb bob
- Cross staff
Chain used for Surveying
20m chain – 100 links
30m chain – 150 links
1 links – 20cm
Links of chain are made by mild steel wire – 4mm diameter.
Each link at the end is bent into a loop and is connected to adjoiningly by means of three oval rings which offers flexibility to the chain. Ends of chains carry brass handle.