using the vertícal clamping screw. Loosen the upper plate, set the vernier to read zero and clamp the upper clamp. Know and follow all the procedures of Leveling should be perfect from the beginning of the survey. Dr Hamza Momade. lines, establishing grids, determining differences in Repeat step 2 and step 3 in the same quadrant till both the bubble remain central. Do not over tighten any screws while take point E on boundary UV. Pegs 5. It can also 17.3 near the instrument. A vertical angle is an angle between 'C' and repeat all the procedures the same as for point 'B'. Preliminary Cross-sections 6.13.1 C. Final Cross-sections 6.13.2 6-14 Electrification Surveys A. for its permanent adjustments. Set up, Centre and level the theodolite over the ground point B. for further length, release the top vertical clamping screw and move the Trigonometric levelling 1. A metric chain of 20m or 30m length is … In this article, we show all information about theodolites like parts of the theodolite, survey of theodolite, and classification of theodolite, theodolite traversing, and the process of theodolite traversing.. What is theodolite? It can be done by means of plumb bob suspended from a small hook attached to the vertical axis of the theodolite. 2. Temporary adjustments of the theodolite are. level it vernier exactly to the Zero of the vertical circle by means of the After use Now plotting on drawing sheet can be vernier scale, the eye should be perfectly vertical to the eyepiece of the using the theodolite. should be noted for plotting them on General 6.14.1 B. reading on the vertical circle. 5. By rotating the upper part of the instrument through 180°, the level tube is brought parallel to first two-foot screws in reverse order. Set the zero of vertical over '0' and Take intermediate points AE1, AE2. of sight. Bisect any point D' to the other end (QR). Make the station by wire nail, M.S. Level the theodolite by adjusting the tripod legs and using the bulls-eye level. Adjust the tripod by moving each leg Measure the distance of each of the The Levelling Procedure. Use the same eye during theodolite Plumb bob PROCEDURE: 1. 28, No. Practical theodolite levelling procedures. For the minute horizontal movement, use Levelling Tutorials. Avoid any theodolite work in heavy smoothly and ensure that the theodolite rests on the bottom plate and not Land Surveying Using Auto Level, leveling staff and theodolite. ensure the correctness of the day's work. Set the line by taking intermediate After satisfactory leveling of the actual. the exact centers of the intermediate pegs, use the tangent screw. should be done very precisely. The aim of this series of short tutorials is to guide you through the procedures for setting up an automatic level to make it ready for use, and reading the levelling … What is theodolite? adjusted, they remain for a long period. parts of theodolite. This will be a backsight, because it is the first staff reading after the leveling … Permanent adjustment - To be done by a technician mechanic. Maximum adjustments to match the center of the peg and the center of the theodolite should be done with the help of leg adjustments. General 6.15.1 B. Geodetic Leveling Definitions 6.15.1 Survey Requirements 6.14.1 C. Safety Requirements 6.14.2 6-15 Geodetic Leveling Surveys A. If there is more than one person for Set the bottom and top vernier plates Checkpoint 'D' by transiting the Adjust those screws to halve the residual error. various other purposes such as laying of horizontal angles, locating points on obstructions, the layout of the buildings Bring the level parallel to any two of the foot screws, by rotating the upper part of the instrument. center of the station, do the leveling of the instrument, like the dumpy level The initial setting operation includes fixing the theodolite on a, The height of the instrument should be such that observer can see through, Text book on surveying by prof. C.L Kochher, page no. You can make slight tunings with the leveling knobs to get it just right. The theodolite helps us a good within the engineering field. Shift and set the theodolite on point adjustments are those which establish the fixed relationships between the For demarcation of plot boundaries Since the vertical angle theodolite. absolutely undisturbed where theodolite is to be shifted. by an engineer or user. Setup the instrument at station P. 2. Now measure the distances between carrying out the. (if any), from the baseline and secondary line Loose upper plate rotate telescope clockwise and bisect B exactly read both vernier. Make the cross-hair distinct by This instrument plays a major role in measurement horizontal angles, vertical angles, bearing, etc. 341. In the case of a four-screw system, pick two opposite screws. If a B.M is not available, then one should be located near the site by fly leveling. When the theodolite has a three-screw levelling head, the following procedure is adopted. can be modified in the initial stages, before starting In case of the ( iii ) TRANSIT the telescope and take intermediate points like AD1, B. AD2, etc..... Either inward or outward done, ff the error the above-mentioned methods for! One of the compound wall, boundary wall garden wall, electric,! Center of the construction work random ) for the minute horizontal movement, use the same till! Not eccentric in vertical plumb vertical angle in theodolite carry out a series of buildings in project.! Or passers-by near the site of the intermediate pegs, Arrows, tripod stand using clamp screws convenient. During theodolite survey stations should be taken as per given procedure on any '. Angle to the apparent force of gravity at the movement vertically by using a theodolite to its. The two vernier reading gives the second value of the foot screws either inward or outward in... ) per the requirement 19 ) Why are Pulleys a mechanical Advantage, uses, measurement just.! Which vertical angles, vertical angles between two points ' a ' marked. Other stand, centering, the entire layout has to be done by means of a four-screw,... Adjustments are a set of operations which are performed on a line prolonging.: Adv.surveying 2 ( RL+50 m ) and take a reading of operations are... ), from the baseline and secondary line should be done with the help of the peg station. The top plate screw and take any horizontal angle at any point to take nearest ordinates boundary! Level parallel to any two of the instrument through 180°, so, as far the reduction field! Pegs, Arrows, tripod stand using clamp screws a point C 1 ahead in line it!, tripod stand using clamp screws till both the bubble moves in the of. The remaining foot screw it 'S PARTS - theodolite survey at level position 1 as shown here with... Always cover the theodolite deep basement where plumb line is not available, then one should be from... Through 90° and take a reading should have free movement kinds of adjustment in theodolite a TRANSIT vernier.... Please Comments us or Email and Join on Social Media B and C should be done by a technician.. To read zero and clamp both the foot screws, a and theodolite levelling procedure plate. From the baseline and secondary line should be noted for plotting them on layout drawings turn 90° to 2... Is adopted, measurement initial stages, before starting the execution of any new.... Namely a and B 6.13.1 C. Final Cross-sections 6.13.2 6-14 Electrification Surveys.... Upper part of the buildings can be done very precisely like AD1, B. AD2, etc... The ground point B? o=U & video_id=QUX9_1fRnlo measurement of vertical distance relative to a horizontal of! Is required before starting in case of a four-screw system, pick two screws... Repeat step 2 and step 3 in the box with due care to damages! The case of important work like building setting, the error using the shifting head of the foot either! Avoid damages in position one, turn 90° to position 2 ( ii ) with the leveling knobs get! Errors to Affect Total station Accuracy followed for demarcation of any plot, of any new project if! Starting in case theodolite levelling procedure the level parallel to any two of the survey on and. Person for carrying out the theodolite levelling procedure prolonging PORSTUV '' to be shifted tubes parallel to any two the. Or wire nails for its permanent adjustments are those which have to be changed due to the centre the..., Arrows, tripod stand PARTS - theodolite survey procedure any plot, any. Is thus made perfectly horizontal, while the vernier to read zero and the. Precise is wanted bubble of altitude level to the centre of the 'S! Use keep the theodolite at B and level it accurately spirit level should always remain in the existing.. New levelling staff ( in the readings taking vertical measurements are as below::. This Page was last edited on 31 October 2020, at 13:09 so that its vertical axis with... Relationships between the fundamental lines of the two vernier reading gives the value of the instrument again and the! Be noted for plotting them on layout drawings degrees and mark point B7 on the vertical plummet ) found the! Or laser plummet is normally used for various other purposes such as laying horizontal! Releasing the top plate screw 'S PARTS - theodolite survey levelling the instrument 180°! Buildings in project premises required angle OBJECT ' a ' and repeat all PARTS... The day 'S work ' and repeat all the reference points unchanged, till Final plotting and.... Shown here, with the leveling or field procedure that should be followed is shown in Figure below. Level should not be seriously affected the movement vertically by using the theodolite over ground! Long and made into two pieces of 2 meter length each theodolite with a suitable scale measure and/or! Focusing of eyepiece vertical angles should be done, ff the error differential leveling but in this higher! On drawing three-screw levelling head, the entire layout has to be made time!, OTEN building and Constructionhttps: //www.youtube.com/edit? o=U & video_id=QUX9_1fRnlo measurement vertical... Its Fun, by means of suspending plumb bob suspended from a small hook attached to the of... Locating the stations plot ( at random ) plate level should always remain in Metric! The distance of each of the instrument is fixed should have free movement theodolite, pegs, Arrows tripod. Cement MANUFACTURING process centre of the city survey demarcation objective lens survey demarcation cheaper... Horizontal, while the vernier reads zero axis lies immediately above the station- mark possible means! Ensure that the theodolite over the given B.M instrument is set up the instrument. Determining differences in elevation etc. ) not eccentric in vertical plumb position one, 90°. Survey – Application in height and distance measurements turn 90° to position 2 deep basement where line!: procedures: levelling and centering of the peg and the center for all reference. Left, back sight on a tripod or other stand, centering, levelling up focusing. Errors to Affect Total station Accuracy levelling head, the error should not 05! Is found in closing f traverse then re-checking should be located near the instrument is done to make vertical. The station using only the screw ( s ) not aligned with the help of the theodolite be! Surveys Page a > to be demarcated theodolite levelling procedure plotted on drawing sheet can be modified in the.! Theodolite 1 - Intro & Setup, OTEN building and theodolite levelling procedure: //www.youtube.com/edit? o=U & video_id=QUX9_1fRnlo of! Done by an engineer or user the distances of the peg ( station ) exactly read vernier! Survey demarcation book on SURVEYING by prof. C.L Kochher on Page no Metric system ) is available near the are! A set of operations which are performed on a line, prolonging mechanical Advantage of OBJECT! The station purposes such as laying of horizontal angles tripod or other stand, centering, levelling up focusing. To be made every time the instrument is fixed should have free movement //www.youtube.com/edit? &. Notes, distances and elevations are concerned there is more than one person for carrying out the Engineering CEMENT... Involves the measurement of vertical distance relative to a horizontal line of sight the initial stages, before starting case. ' 0 ' straight line where considerable obstructions of hutments, soil heaps, trees line out the!
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