Vertical Alignment in Highway Engineering - Road Design
Vertical Alignment of Road Design (Highway Engineering). ESurvey CADD Road Design Module addresses all the requirements of Vertical Alignment including tangents, deflection angle, K Value, HIP.
Read More:
https://esurveying.net/vertical-align...
Welcome to video session on how to design vertical alignment for a highway using ESurvey CADD Road Design module.
1. Existing Profile Button settings
We can design vertical alignment for all the alignments that we have created in the horizontal alignment tab. Normally vertical alignment is done either for Project center line or LME and RME in case of the divided carriageway. The vertical design is also done for the service road and drain center. All that can be achieved created in the Vertical design slab. Before we design vertical alignment we have to extract elevation for an existing alignment profile.
To extract elevation along an alignment ESurvey CADD allows various settings. Click on the Existing Profile button to open the Profile setting window. Select all the alignment names for which vertical alignment design has to be created. We can define chainage interval for vertical alignment irrespective of what chainage interval we have defined in horizontal alignment. We can create elevations either at chainage points or at all the surface edges, that means ESurvey CADD will extract elevation from the TIN surface wherever alignment intersects with TIN. If you select “Add changes at the change points” elevations for all the change points are also generated.
2. Importing the vertical alignment tangents
Export the Longitudinal section drawing to the cad package, after extracting the elevations for alignments as explained in the previous step. Now draw the tangent lines for alignment. We can export the tangent line from CAD by selecting “Export LS data by selecting polyline(LSEXP)” menu under the “Road Design” menu of the “esurvey cad menu”. The program will ask you to provide input like drawing scale, datum, etc., which can be provided by referring to Longitudinal Section drawing. After exporting the tangent line from CAD, it can be imported to ESurvey CADD via the Import button after selecting the respective alignment from the dropdown. That means importing tangent in vertical alignment is similar to the way you import tangent lines in horizontal alignment. A similar procedure can be repeated for many alignments.
3. K Value Setting
Before we go ahead and design a vertical profile, we have to define the minimum curve length. Click on the K Value button to do the setting. For achieving the best results you can set K Value for sag and crest curve. By default 44 is K value for sag curve and 74 is the value of the crest curve. You have the liberty of setting different values for all these parameters, depending on the values you set here software will further design the vertical curve.
4. Designing the vertical profile.
Select the alignment for designing, all the PVI points of the selected alignment are listed, you may select all of them or by referring to gradient you can select only a few PVI’s and then click on the Design button. The software will design vertical curves for all the PVI’s. You may repeat the same for different alignments. In order to see the vertical table showing the curve details you can click a button Vertical curve table and vertical curve table settings window will appear where you can check the box under the display male necessary changes like Line color, text color, text height, and table offset and close window and view the curve tables in the drawing. There may be some VIP points that are not designed. The reasons could be that consecutive curves are overlapping or a curve could not be fit as per K Value settings. In the next step, you can change parameters of designed curves and you can also specify curve values for VIPs for which software has not fit a curve.
#highwaydesign, #landsurvey, #infrastructure, #autocad, #bricscad, #totalstation
------Related Subjects------
Vertical Alignment in Highway Engineering - Road Design
Designing the vertical profile
Importance of Vertical Alignment in Highway Design
How to Create Tangents for Vertical Design
Sight Distance
Valley Curve
Summit Curve
Station Points
K Value Setting
Road Design
Software
Vertical Alignment
Highway Design
Vertical Profile
Profile Corrective Course
Optimisation of Road Quantity
Infrastructure Engineering
Land Survey
AutoCAD
ZWCAD
BricsCAD
Geometric Design of National Highway
Read More:https://esurveying.net/road-design-so...
Subscribe to our YouTube Channel: / esurveyingnet
Follow us on facebook: / esurveying