FWR2 - ELEMENTARY SURVERING FIELD MANUAL FIELD WORK NO 2...

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ELEMENTARY SURVERING FIELD MANUAL COURSE AND SECTION: CE 121-0F / A6 SUBMITTED BY: SN. NAME: Reyes, Elyssa STUDENT NO.: 2013151919 GROUP NO. 5 CHIEF OF PARTY: Nicko Garachico DATE OF FIELD WORK: 10/29/2015 DATE OF SUBMISSION: 11/10/2015 SUBMITTED TO: PROFESSOR: Engr. Bienvenido Cervantes FIELD WORK NO. 2 LAYING OF A SIMPLE CURVE BY USING TAPE ALONE (THE INCREMENTAL CHORD AND TANGENT OFFSET METHOD) GRADE
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Objectives 1. To be able to lay a simple curve by using the tape alone. Instruments Range Poles - Ranging poles are used to mark areas and to set out straight lines on the field which consists of a straight rod painted in bands of alternate red and white each one foot wide. They are also used to mark points which must be seen from a distance. Ranging poles are straight round stalks, 3 to 4 cm thick and about 2 m long. They are made of wood or metal. Chalk - A chalk is a soft, white, porous sedimentary carbonate rock, a form of limestone composed of the mineral calcite. 50 meter tape - A fifty meter long tape that are used to measure distances on the field. This is used in surveying for measuring horizontal, vertical or slope distances. PROCEDURES 1. The professor gives the following data:
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I = _______ R = _______ Station PC (preferably not on full station):_________ Adopt Full chord length of ______ m 2. The professor assigns the location of PC in the field, together with the direction of the backward tangent. (Note: Be very careful in assigning the location of station PC and direction of the backward tangent so that the curve will not be obstructed by any large permanent structure.) 3. The students: a. Compute the central incremental angle of the simple curve assigned, Lc and Sta PT. b. Compute the incremental tangent offset distances x and y of each intermediate stations before going to the field. c. Compute the first offset distances x and y using the formula: The tangent offset distance x 1 must be solved using: x 1 =c 1 * cos(d 1 /2) The tangent offset distance y 1 must be solved using:y 1 =c 2 * sin(d 1 /2) d. Compute the second offset distances x and y using the formula: The tangent offset distance x 2 must be solved using: x 2 = c*cos(d 1 +D/2) The tangent offset distance y 2 must be solved using:y 2 = c*sin(d 1 +D/2) e.
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