Forging new generations of engineers
Download
1 / 24

Forging new generations of engineers - PowerPoint PPT Presentation


  • 116 Views
  • Uploaded on

Forging new generations of engineers. Road Design. A Process for Road Layout. Road Design. Check the existing Topographical data. Road Design. Decide on the type of road and characteristics Freeway Arterial Collector Feeder. Road Design.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Forging new generations of engineers' - blade


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

A process for road layout

Road Design

A Process for Road Layout


Road Design

  • Check the existing Topographical data


Road Design

  • Decide on the type of road and characteristics

    • Freeway

    • Arterial

    • Collector

    • Feeder


Road Design

Setting up a chart for survey data and control points


Transit Line

Road Design

Setting up the 90° Intersection


Road Design

  • Plan the Start of the Curve (PC)


Road Design

Add information to the chart


Layout the Curve

Road Design


Road Design

Curve information

Knowns

R=300’

∆=33°34’

Now Calculate the Unknowns about the curve.


Road Design

To find the distance from P.C. to P.T. use the formula



Road Design

Convert 33°34’ to degrees

34’/60’=.567

33°34’ =33.567°


Road Design

Back to the Formula

L=175.756’


Road Design

Finding the angle of the 100’ chord (D)

Bisect the angle to create a Right Triangle

Inverse SinX=9.594°

D=2(9.594°)

D=19.1881°

D=19°11’


Road Design

Add information to the chart


Road Design

Continue laying out the road and points


Road Design

To create the vertical profile of the road, lines are dropped from the station points and an exaggerated vertical scale is created. Elevation data from existing station points are plotted to a graph.


Road Design

A line is plotted through the points. The line is then smoothed and parabolic transitions are added between slopes.


Road Design

Vertical information is transferred back to the control points.


  • Freeway: A road with limited access that generally handles between 1,000-1,300 cars per hour per lane.


  • Arterial: Roads that carry between 400 to 800 cars per lane per hour depending on businesses,  parking, signs, and control signals.


  • Collectors: Local roads that can generally carry 100-250 cars per lane per hour.


  • Feeder: Local streets, Cul-de-sacs, or loops that service neighborhoods.


ad