Create alignments in Civil 3D
Use lines and curves to create an alignment to represent a road.
Tutorial resources
These downloadable resources will be used to complete this tutorial:
Transcript
00:03
In Civil 3D, you create alignments as a combination of lines, curves, and spirals that are viewed as one object.
00:10
Alignments can represent roads, pipelines, or other baselines.
00:15
In this example, you use the Alignment Layout Tools to create an alignment to represent a road.
00:21
On the Home tab, in the Create Design panel, expand the Alignment drop-down and select Alignment Creation Tools.
00:29
In the Create Alignment – Layout dialog, specify the Name of the alignment.
00:34
On the General tab, specify the Alignment style, Alignment layer, and Alignment label set.
00:42
Switch to the Design Criteria tab, and set the Starting design speed to 60 km/h for this example.
00:50
Enable all checkboxes on this tab, and then click OK.
00:54
In the Alignment Layout Tools toolbar, select the first button on the left, and select Straight–Straight/Tangent-Tangent (With Curves).
01:04
This option automatically creates curves between click points.
01:09
Click the desired points or enter the coordinates.
01:13
Press ESC when finished.
01:15
For this example, warning symbols indicate that the alignment is not design-compliant for a speed of 60 km/h.
01:24
This can be fixed or edited by adjusting the geometry of the road, or by clicking the Alignment Grid View toolbar option.
01:32
When the design is compliant, the warning symbols disappear.
01:37
From the Alignment Layout Tools toolbar, alignment points can be added or subtracted, and curves inserted.
01:44
You can also edit the alignment using the blue grips that appear when it is selected:
01:50
Use the square grips at the ends of tangents to edit the position of the tangent.
01:55
Use the square grip at the midpoint of tangents to move the entire tangent.
02:00
Use the triangle grip to move the PI of the curve.
02:04
Use the circular grips at either end of a curve to sharpen or broaden a curve, thus increasing or decreasing its length.
02:12
Use the circular grip at the midpoint for relative movement between the points.
00:03
In Civil 3D, you create alignments as a combination of lines, curves, and spirals that are viewed as one object.
00:10
Alignments can represent roads, pipelines, or other baselines.
00:15
In this example, you use the Alignment Layout Tools to create an alignment to represent a road.
00:21
On the Home tab, in the Create Design panel, expand the Alignment drop-down and select Alignment Creation Tools.
00:29
In the Create Alignment – Layout dialog, specify the Name of the alignment.
00:34
On the General tab, specify the Alignment style, Alignment layer, and Alignment label set.
00:42
Switch to the Design Criteria tab, and set the Starting design speed to 60 km/h for this example.
00:50
Enable all checkboxes on this tab, and then click OK.
00:54
In the Alignment Layout Tools toolbar, select the first button on the left, and select Straight–Straight/Tangent-Tangent (With Curves).
01:04
This option automatically creates curves between click points.
01:09
Click the desired points or enter the coordinates.
01:13
Press ESC when finished.
01:15
For this example, warning symbols indicate that the alignment is not design-compliant for a speed of 60 km/h.
01:24
This can be fixed or edited by adjusting the geometry of the road, or by clicking the Alignment Grid View toolbar option.
01:32
When the design is compliant, the warning symbols disappear.
01:37
From the Alignment Layout Tools toolbar, alignment points can be added or subtracted, and curves inserted.
01:44
You can also edit the alignment using the blue grips that appear when it is selected:
01:50
Use the square grips at the ends of tangents to edit the position of the tangent.
01:55
Use the square grip at the midpoint of tangents to move the entire tangent.
02:00
Use the triangle grip to move the PI of the curve.
02:04
Use the circular grips at either end of a curve to sharpen or broaden a curve, thus increasing or decreasing its length.
02:12
Use the circular grip at the midpoint for relative movement between the points.
