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Surveying-1

by Jntu HeroesJntu Heroes
Type: PracticalInstitute: Jawaharlal nehru technological university anantapur college of engineering Offline Downloads: 45Views: 1567Uploaded: 11 months ago

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DEPARTMENT OF CIVIL ENGINEERING SURVEYING LAB I MANUAL S.No Name of the experiment 1. Survey of an area by Chain Survey (Closed Traverse) & Plotting 2. Chaining across Obstacles 3. Determination of two inaccessible points with Compass 4. Survey of a given area by Prismatic Compass (Closed Traverse) and plotting after adjustment 5. Radiation, Intersection Methods of Plane Table Surveying 6. Two Point and Three Point Problem in Plane Table Survey 7. Traversing by Plane Table Surveying 8. Fly Leveling (Differential Leveling) 9. An exercise of L.S. and L. S. and Plotting 10. Two Exercises on Contouring
FAMILARITY WITH INSTRUMENTS USED IN CHAIN SURVEYING OBJECTIVE: Study of various instruments used in chain surveying and their uses INSTRUMENTS: 1) Chain or tape 2) Arrows 3) Ranging rods 4) Cross staff 5) Offset rods 6) Pegs 7) Plumb bob DESCRIPTION OF INSTRUMENTS: 1 a) Chain: The chain is composed of 100 or 150 pieces of galvanized mild steel wire, 4mm in diameter called links .The ends of each link are bent into a loop and connected together by means of three oval rings. The ends of the chain are provided with handles for dragging the chain on the ground, each wire with a swivel joint so that the chain can be turned without twisting. The length of the chain is measured from the outside of one handle to the outside of another handle. Following are the various types of chain in common use: 1) Metric chains 2) Gunter` s chain or surveyors chain 3) Engineers chain 4) Revenue chain 5) Steel band or Band chain Page No. 1
Metric chain: Metric chains are made in lengths 20m and 30m. Tallies are fixed at every five-meter length and brass rings are provided at every meter length except where tallies are attached b) Tapes: The following are the various types of tapes i) Cloth tape ii) Metallic tape iii) Steel tape iv) Invar tape Among the above, metallic tapes are widely used in surveying. A metallic tape is made of varnished strip of waterproof line interwoven with small brass, copper or bronze wires. These are light in weight and flexible and are made 2m, 5m 10m, 20m, 30m, and 50m. Page No. 2

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