Chain Surveying
Added on 2023-02-06
6 Pages630 Words81 Views
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02. Chain Surveying CIVIL
Surveying, Measuring & Setting out Tutorial -2
Page 1 of 6
Eng. C. M. Shafraz
Introduction
• Simple Technique
• Small Plane Areas with Very Few Details
• It gives quite accurate results, if it is done carefully
• The necessary equipment for field work are;
➢ Chain or Steel Tape
➢ Linen Tape
➢ Ranging Rod/Pole
➢ Arrows
➢ Mallet
➢ Plumb Bob
➢ Pegs
➢ Cross Staff (Sometime)
Triangulation
Well-conditioned
➢ A tangle is said to be well conditioned when no angle is less than 30° or greater than 150°.
➢ An equilateral triangle is considered the best condition or ideal triangle.
ill – conditioned triangles
• A tangle in which an angle is less than 30° or more than 150°.
• It is said to be ill conditioned.
Surveying, Measuring & Setting out Tutorial -2
Page 1 of 6
Eng. C. M. Shafraz
Introduction
• Simple Technique
• Small Plane Areas with Very Few Details
• It gives quite accurate results, if it is done carefully
• The necessary equipment for field work are;
➢ Chain or Steel Tape
➢ Linen Tape
➢ Ranging Rod/Pole
➢ Arrows
➢ Mallet
➢ Plumb Bob
➢ Pegs
➢ Cross Staff (Sometime)
Triangulation
Well-conditioned
➢ A tangle is said to be well conditioned when no angle is less than 30° or greater than 150°.
➢ An equilateral triangle is considered the best condition or ideal triangle.
ill – conditioned triangles
• A tangle in which an angle is less than 30° or more than 150°.
• It is said to be ill conditioned.
02. Chain Surveying CIVIL
Surveying, Measuring & Setting out Tutorial -2
Page 2 of 6
Eng. C. M. Shafraz
Offset Area
Perpendicular Offset Measurement
Oblique Offset Measurement
Tie Measurement to the Station/Location Sketch
The primary control points are triangulation stations.
The secondary control points are reference to the
primary control stations.
Surveying, Measuring & Setting out Tutorial -2
Page 2 of 6
Eng. C. M. Shafraz
Offset Area
Perpendicular Offset Measurement
Oblique Offset Measurement
Tie Measurement to the Station/Location Sketch
The primary control points are triangulation stations.
The secondary control points are reference to the
primary control stations.
02. Chain Surveying CIVIL
Surveying, Measuring & Setting out Tutorial -2
Page 3 of 6
Eng. C. M. Shafraz
Steel Chain
Equipment
Steel Tape & Linen Tape Ranging Pole
Reconnaissance Diagram
Also called - Index Plan, Reference Sketch, Key Plan or Prospection Diagram
Procedure
1. Reconnaissance
2. Selection of Stations
3. Marking of Stations
4. Measurements (Running Survey Lines)
5. Note Keeping
Running Survey Lines
1. Chaining a horizontal line
2. Ranging a chain
3. Stretching a chain
4. Carrying the chain to next length
5. Folding the chain
Surveying, Measuring & Setting out Tutorial -2
Page 3 of 6
Eng. C. M. Shafraz
Steel Chain
Equipment
Steel Tape & Linen Tape Ranging Pole
Reconnaissance Diagram
Also called - Index Plan, Reference Sketch, Key Plan or Prospection Diagram
Procedure
1. Reconnaissance
2. Selection of Stations
3. Marking of Stations
4. Measurements (Running Survey Lines)
5. Note Keeping
Running Survey Lines
1. Chaining a horizontal line
2. Ranging a chain
3. Stretching a chain
4. Carrying the chain to next length
5. Folding the chain
End of preview
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