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Civil Engineering (BSCE 01)
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ATENEO DE DAVAO UNIVERSITY
SCHOOL OF ENGINEERING AND ARCHITECTURE
E. Jacinto Street, 8016 Davao City
CE 2238 | 5-
ROUTE SURVEYING LAB
Laboratory Exercise No. 4
LAYING OUT A SIMPLE CURVE WITH AN OBSTRUCTION
Submitted to ENGR. ROBERT A. ROMERO
Submitted by DELA CERNA, JONN DEALL S.
Date January 17, 2018
Laboratory Exercise No. 4
LAYING OUT A SIMPLE CURVE WITH AN OBSTRUCTION
I. OBJECTIVES
To know the method of laying out a simple curve by deflection angle method given that there is an obstruction
To understand and actualize the underlying principles of this method based on the knowledge from the preceding lectures.
II. INTRODUCTION
Curves are usually employed to make the change in direction at the intersection of straight lines gradual. They are used to deflect a vehicle travelling along one of the tangents safely and comfortably through a deflection angle (Khan, 2015). There are two methods in laying out simple curve depending on the instrument used – linear and angular methods. Linear method is the method which restricts the use of angle measuring instruments like transit, total station and etc.
In this field work, a horizontal simple curve is to be laid out by a deflection angle. Curves are initially arranged with two straight lines called tangents. The first tangent is referred as the back tangent and the second tangent is called the forward tangent. These tangents are extended until they reach a point of intersection. The curve is set out with the use of the deflection angles which are turned at the point of curvature from the tangent to the points or stations along the curve until it reaches the point of tangency.
III. MATERIALS
Engineer’s Transit
DELA CERNA, JONN DEALL S. Route Surveying Lab
5 + 570 2 12 ᴼ 08’ 33 ᴼ 59’ 0.
5 + 571 3 12 ᴼ 08’ 46 ᴼ 07’ 0.
5 + 572 4 12 ᴼ 08’ 58 ᴼ 15’ 0.
5 + 573 5 12 ᴼ 08’ 70 ᴼ 23’ 0.
5 + 574 6 12 ᴼ 08’ 82 ᴼ 31’ 0.
5 + 575 7 12 ᴼ 08’ 94 ᴼ 39’ 0.
5 + 576 PT 23 ᴼ 25’ 118 ᴼ 08’ 1.
Computaions:
DELA CERNA, JONN DEALL S. Route Surveying Lab
Summary: STA PI: 5+575. STA PC: 5+567. STA PT: 5+585. Radius: 4. Tangent: 7. Length of Curve: Δ: 118 ᴼ08’ Middle Ordinate: 2 m External Distance: 4 m
SKETCH:
VI. D
O C U M E N T A T I O N
DELA CERNA, JONN DEALL S. Route Surveying Lab
OBSTRUCTION
Lab Rep 5 - lab rep
Course: Civil Engineering (BSCE 01)
University: Ateneo de Davao University
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