Ezigrade (version 2)

Two Hinged Plane's Design

This is a common design procedure used by Multiplane users. Ezigrade allows you to select a common intersecting line as a hinge line. Ezigrade forces the design to intersect along this common line.
Please be aware that every additional constraint imposed upon a surface leads to additional volumes of dirt needed to be moved. Also be aware that if you wish two planes to match you can also specify additional smoothing which smooth's the area between the surfaces to get a smooth match.
Open Ezigrade , and then from the File - Open menu open up the "hinge_example.cdsdat" example. The natural surface will be displayed. We have already set the position of the grid. You can modify it by left clicking on it and moving and rotating using the grip points. In this example the water runs from the top of the job towards the bottom.
In this example we intend to have two sections that are vertically orientated with the hinge link between the two. We need to first draw in some section lines.
From the "Fields" menu click on the Fields -> Insert Field Edge. Draw a closed surface that encloses the whole job. Ezigrade will close the section if you finish by finishing on the start point. You need to hit the "Enter" key to finish the process. You should have something similar to that shown below:
We intend to split this into two with a vertical line. Again from the Fields menu ->Insert Field Edges and draw in a line starting at the top to the bottom. Again finish the process by hitting the "Enter" key. We have the following:
We now need to define the two sections. The procedure is to select the links that define the section. Once done click on the Fields -> Add Field. We now have section1 defined. Repeat for the second section. We now have two sections defined.
In this example we want to define the middle link as a hinge link. Left click on it to select; and then from the Fields -> Toggle Hinge Links sets it as a hinge. If you have a link defined as a hinge you can turn it off using the same procedure.
The job should look as below: The hinge link is shown as a grey color.
Make sure the that each of the two sections is set to a plane. I would also recommend that you change the bearing of the field to more closely match the grid. I have used a bearing of 60 degrees. Once done click on the Grading - Grading (grid based) / or triangle based  to calculate the design. Ezigrade will now calculate volumes etc, and design and cut/fill surfaces. The design surface is seen below.
For the more astute viewer's; you may notice that the contours are very slightly out around the join. Run a straight edge along some of the contours and you may notice the slight deviation near the hinge join. This is because Ezigrade use's the existing points. To be mathematically exact these points need to lie along the join. We have an option that allows you to do this. From the Field - Add points along Selected Strings menu item to do this. These points will now be used in the design and give a mathematically correct result.
For this job - you probably wouldn't bother as difference on the ground would be negligible.

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