CE121-3
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CE121-3

Course Number: CEGE ce121f, Winter 2013

College/University: Mapúa Institute of...

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FIELD WORK NO.3 LAYING OF A SIMPLE CURVE BY USING THE TAPE ALONE (INCREMENTAL CHORD AND TANGENT OFFSET METHOD) OBJECTIVES: 1. To be able to lay a simple curve by using the tape alone. INSTRUMENTS: 1. 2 range poles 2. Chalk (for pavements) 3. 2 marking pins (for soft ground) 4. 50 meter tape FINALDATASHEET FIELDWORK3 LAYINGOFASIMPLECURVEBYUSINGTHETAPEALONE (THEINCREMENTALCHORDANDTANGENTOFFSETMETHOD)...

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WORK FIELD NO.3 LAYING OF A SIMPLE CURVE BY USING THE TAPE ALONE (INCREMENTAL CHORD AND TANGENT OFFSET METHOD) OBJECTIVES: 1. To be able to lay a simple curve by using the tape alone. INSTRUMENTS: 1. 2 range poles 2. Chalk (for pavements) 3. 2 marking pins (for soft ground) 4. 50 meter tape FINALDATASHEET FIELDWORK3 LAYINGOFASIMPLECURVEBYUSINGTHETAPEALONE (THEINCREMENTALCHORDANDTANGENTOFFSETMETHOD) DATE:08/15/13 GROUPNO.:3 TIME:8:0012:00 LOCATION:IntramurosWalls WEATHER:VerySunny PROFESSOR:Engr.BienvenidoA.Cervantes DATASUPPLIED: I= R=286.5m D=4 StationofthePC:13+791.02(Preferablynotonafullstationmark) AdoptFullchordlengthof365m(Preferablyinbetween2m5m) STATION CHORD CENTRAL OCCUPIED OFFSETDISTANCES OBSERVED ANGLE X Y PC A 15.02 3 15.015 0.393 A B 20 4 19.963 1.221 B C 20 4 19.951 1.395 C D 20 4 19.951 1.395 D E 20 4 19.951 1.395 E F 20 4 19.951 1.395 F G 20 4 19.951 1.395 G H 20 4 19.951 1.395 H I 20 4 19.951 1.395 I J 20 4 19.951 1.395 J K 20 4 19.951 1.395 K L 20 4 19.951 1.395 L M 20 4 19.951 1.395 M N 20 4 19.951 1.395 N O 20 4 19.951 1.395 O P 20 4 19.951 1.395 P Q 20 4 19.951 1.395 Q R 20 4 19.951 1.395 R S 20 4 19.951 1.395 S PT 9.98 1.996 19.973 1.046 COMPUTEDLENGTHOFTHECHORD:365m ACTUALLENGTHOFTHECHORD:363.5m COMPUTATIONS: CENTRALANGLE: OFFSETDISTANCE: OBSERVATION: I have observed that there are similarities in formulas in finding the tangent offset distance; the tangent offset distance, the tangent offset distance and lastly the tangent offset distance. So I think it is not hard for us to memorize the formulas all in getting the tangent offset distance. But I have also observed that there might be some time that the discrepancy of distance PC to A and A to B is big. However, the most important part is the distance of PC to A and the last point to PT because they are the only part that is different from the others. The procedure really need some time to finish, computations and everything. But the point is you are just keep on repeating the procedure, same formulas but different data and therefore the only way it becomes easy if you have a lot of time to compute for the tangent offset distance. DISCUSSION/CONCLUSION: Last August 15 2013 we went to Intramuros Walls to perform fieldwork no. 3, Laying of a simple curve by using the tape alone (Incremental chord and tangent offset method. Professor Cervantes give all the data and we are asking to find out all the tangent offset distance. We first lay the curve in the field starting in the position of the PC. The front tape man should hold the 0 mark of the tape at station PC and then the tangent offset tape man should hold and locate the length mark, loop the tape and hold also the next full meter length. The point A tape man should locate and hold the length of the tape from the tangent offset tape man and also loop the tape and hold the next full meter length of the tape. The front tape man while holding the 0 mark of the tape must also hold the tape length distance from point A tape man. And same procedure to station B and station C. I therefore conclude that patience is a virtue. No matter how long the procedure is, if you understand everything and analyze it, everything will be easy. SKETCH:
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