This subassembly creates corridor-side daylighting links with user-defined slope configurations, such as flat, medium, and maximum slopes for cut and fill situations.
This subassembly creates either a v-shaped or flat- bottom ditch in cut situations, and includes an option to include guardrail widening for steep fill conditions.
The final daylighting link can be omitted for cases where the corridor model needs to be left in an incomplete state. For example, this might be done so that grading surfaces on adjacent properties can tie to the hinge point on the uncompleted roadway.
You can also specify optional lined materials for daylight and other links (All Links, Daylight Links, Fill Links Only, and None).
This subassembly is typically attached to the subassembly used at the outside edge of the roadway, such as the edge of shoulder, back of sidewalk, or back of curb. The attachment point is at the inside edge of the ditch front link, the top of the flat or medium fill slope, or inside edge of guardrail widening link, depending on conditions.
Note: All dimensions are in meters or feet unless otherwise noted. All slopes are in run-over-rise form (for example, 4 : 1) unless indicated as a percent slope with a “%” sign.
This section lists the parameters in this subassembly that can be mapped to one or more target objects. For more information, see in the AutoCAD Civil 3D User’s Guide Help.
The following steps are used by this subassembly to determine which conditions apply:
- The location of the Cut Test Point (see diagram) is calculated using the Foreslope Width, Foreslope Slope, and Ditch Width parameters.
- If any portion of the foreslope slope or ditch bottom is in cut, the section is computed as a cut section as follows:
- If the Cut Test Point is above the target surface, the Foreslope link or ditch bottom is truncated at the point where it intersects the surface going from cut to fill, otherwise:
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- If Include Daylight Link is set to omit, no daylight link is calculated.
- The intercept to the target surface is calculated using the Flat Cut Slope value.
- If the height of the flat cut slope exceeds the Flat Cut Max Height, the intercept to the target surface is re-calculated using the Medium Cut Slope value.
- If the height of the medium cut slope exceeds the Medium Cut Max Height, the intercept to the target surface is re-calculated using the Steep Cut Slope value.
- If no portion of the foreslope link or ditch bottom is below the target surface, the section is computed as a Fill section as follows:
- The intercept to the target surface is calculated using the Flat Fill Slope value.
- If the height of the flat fill slope exceeds the Flat Fill Max Height, the intercept to the target surface is re-calculated using the Medium Fill Slope value.
- If the height of the medium fill slope exceeds the Medium Fill Max Height, the guardrail widening link is added to the assembly using the Guardrail Width and Guardrail %Slope parameters (unless the Guardrail Width is zero). The intercept to the target surface is re-calculated from the outside edge of the guardrail widening link using the Steep Fill Slope value.
- If Include Daylight Link is True, the flat, medium, or steep fill slope link is added to the assembly.
A guardrail structure may be applied to fill sections that meet the criteria for using the steep fill slope. If this criteria is met, the Guardrail Width is not zero, and Include Guardrail is set to true, then a guardrail structure is drawn at the station. The dimensions of the guardrail structure are fixed as shown in the diagram below.
Like other daylight subassemblies, this subassembly optionally lets you add a lined material. You can specify three ranges of slopes. Material type 1 is applied if the slope of the links is up to the specified slope value. From slope 1 to slope 2, the second type of material applied. Similarly, if the slopes of links fall within slope 2 and slope 3 values, then material 3 is applied. If the link slopes are flatter than slope limit 3, then no material is applied.
If a lined material is added to the subassembly, then parallel links are added to the daylight links with specified thickness. This thickness parameter (for example, Material 1 Thickness) is measured perpendicular to the link. Bottom level links are coded with Datum and daylight links are coded with Top. Shapes enclosed by these materials are coded with material name.
In AutoCAD Civil 3D 2010 and previous versions, the Material Thickness parameter was measured vertically. In AutoCAD Civil 3D 2011 and later, this parameter is measured perpendicular to the link. Therefore, if you open a drawing containing these subassemblies that was created in AutoCAD Civil 3D 2010 or prior in AutoCAD Civil 3D 2011 or later, and then rebuild the corridor(s), this parameter will be changed to reflect the new behavior. Any volume reports that use this subassembly will be updated to reflect the new behavior.
In layout mode, this subassembly shows both the cut and fill flat-slope conditions. The daylight links are extended outward for a horizontal distance of 3 meters or 10 feet, and are shown in dashed lines terminating in arrowheads pointing outwards.
The following table lists the point, link, and shape codes for this subassembly that have codes assigned to them. Point, link, or shape codes for this subassembly that do not have codes assigned are not included in this table.
