final field work 5 - MAPA INSTITUTE OF TECHNOLOGY Muralla...

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MAPÚA INSTITUTE OF TECHNOLOGY Muralla St. Intramuros, Manila School of Civil, Environmental and Geological Engineering FIELD WORK NO. 5 DIFFERENTIAL LEVELING WITH TURNING POINTS (DOUBLE-RODDED) COURSE AND SECTION: CE 120-0F/B9 SUBMITTED BY: SN : NAME: Padilla, Allen Martin D. STUDENT NUMBER : 2014100627 GROUP NO : 6 CHIEF OF PARTY : CLEMENTE, Keiser DATE OF FIELDWORK: August 4, 2016 DATE OF SUBMISSION: August 11, 2016 SUBMITTED TO: PROFESSOR: ENGR. BIENVENIDO CERVANTES GRADE
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OBJECTIVES To develop the skills in determining the difference in elevation between two points, both of which are accessible from a single point of observation using a dumpy level. To acquire the knowledge of finding the elevation of a point from a benchmark of known elevation by establishing turning points to and from the point of unknown elevation. To develop the technical know-how of using the precise level. To work harmoniously and effectively with one’s group while performing each assigned task. INSTRUMENTS 1 Plumb bob A plumb bob is a pointed metal weight attached to a string used to calibrate a straight vertical line in construction and surveying. Although simple in design, the tool has great accuracy because it relies on the force of gravity to pull the pointed weight plumb, or to a true vertical. To keep a plumb bob from swinging like a pendulum, take a few precautions. Use a plumb bob with a heavy weight of 6 to 8 oz. or more, and use rope that doesn’t stretch .   Leveling rod A surveying tool used to take elevation measurements for the purpose of profiling a section of terrain. It used in measuring the vertical distance between a point on the ground and the line of sight of a surveyor's level There are a number of basic designs available, including versions for optical and digital sighting and record keeping. Surveying supply companies typically sell leveling rods and accessories like cases, replacement components, and other surveying tools. Engineers, surveyors, and members of other professions that need to perform surveys receive instruction in the use of a leveling rod as part of their education. This tool is also known as a level staff, a reference to the original design, which was simply a tall staff with measurement markings. The surveyor could place the staff in a location with a landmark of known height, perform a sighting for reference, and then move the staff to take a series of sightings, looping back to the original site or another known reference for confirmation at the end.
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Precise level A tool used for measuring horizontal angles and directions, vertical angles, and
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