Mi previous article It explained something about CivilCAD, a very practical application aimed at both AutoCAD and Bricscad. Now I want to continue the exercise based always on our previous Surveying course With Total Station, working the alignment in a digital model.

In the case of CivilCAD this is called project axis, although from SoftDesk or Land we have known it as alignment by its name in English. Basically it consists of creating a central axis, which may well be the line of a pipe, the axis of the design of a road or simply a line of cross section to a ground.

Following the recent article, where I showed how to create a digital model with contour lines, I will briefly summarize how you create and draw an alignment with your profile.

1. Creating a 3D polyline

This, as it is necessary to create it from the topography book, it is recommendable to do it in 2D, indicating the points where it passes because it usually comes with a polygon of deflections. After the polygon is reached, the vertices are touched and the elevation is manually changed in the properties table. (Mo + enter command)

Then, the lines are joined, with the command Pedit, In the option join.

If you have the x, y, x coordinates, then it is simpler. Points are created, with the command point, Then writing the x, y, z coordinates concatenating them from Excel. Then draw the polyline with the snap Activated at the point nodes (point).

2. Define the stations in plan

This is done from the menu CivilCAD> Altimetry> Project Axis> Mark stations

We return a sequence in the command line that only has to follow:

1 Print Scale to <1000>:

This has to do with the size at which we expect to print the drawings or generate the layouts. We note our interest, in this case 1000, and then enter.

Select project axis:

Here we are asked to select the polyline. We must touch it near the end where we want the stations to start.

Initial station nomenclature <0 + 000>:

That is, if we want another modality for the brand of each station, if we do not change it we only do enter.

Length right <10.000>:

Left length <10.000>:

Here, it asks us what distance we want the system to consider, for cross-sectional creation. Generally the same on each side, but not necessarily so, as in the case that we are working a 2 expressway lanes, 2 coming; It is obvious that we will need on one side to take a greater distance to overlap the other lane and include the slope.

Interval/ Distance / Station / Point / End <I>:

Here he is asking us how we expect the stations to be marked along the axis; In our case, we want each 20 meters, we choose the letter I.

Separation between stations <20.000>:

Since we have chosen the interval option, we now set the distance. Then we chose the starting station and the final.

Starting station <0 + 000>:

End station <X + XXX>:

From this moment, that polyline is considered an alignment, in the case of CivilCAD, an Axis, with associated data. A little poor CivilCAD in this part, but simple because the linear process is defined; clear that CivilCAD does more, But the confusion between the Settings and Survey panels wants some patience; Then the number of tabs that have the templates panel and finally the difficulty of passing a template to other jobs.

3. Generate Profile

Now what interests us is to draw the elevation profile of the terrain along the polyline.

Then we follow the sequence of the command line:

Axis/ Points / Manual / File / 3d polyline <E>:

In this case, we will use the Axis option, however it could have been a 3D polyline if we had not converted it into alignment, points or even a manually drawn line.

Select project axis:

Horizontal Scale 1 to <1000.000>:

Vertical scale 1 to <1000.000>:

It is convenient to change the vertical scale, if we want the elevation change to be noticeable. For example, if 1,000 is selected from vertical scale, 200 horizontal scale can be used. This would make a 1: 5 relationship that could make visualization meaningful.

Position:

Ask us where we will place the profile, choose a point to the right of the drawing, then enter.

4. Generate the grid for the profile

Choose from the menu CivilCAD> Altimetry> Profiles> Reticle And then we follow the sequence of the command line:

Select terrain profile:

We indicate in the panel that unfolds, if we want only the natural terrain, or also the alignment. We also define whether labels They will be automatic or we will define them manually.

It is called a name and defines data of the stations as dimensioned distance, where it starts, number of decimals and if we want a box around.

This should already be our job ready. Definitely simple compared to Civil 3D, although somewhat limited in the definition of templates that one does embedded in xml form. There is also some difficulty for automatic updating between the plant and the profile.

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