This subassembly is used to replace an existing curb and gutter, with the sod strip tying to the existing inside edge of sidewalk. The vertical placement of curb and gutter is determined by allowable milling and/or overlay at the flange points and by allowable ranges of slopes for sod strip.
To apply this subassembly, flange point information (alignment or offset value) is essential.
The attachment point is outside/highside point of the sod strip edge of the sidewalk. Though notionally this attachment point is to mark the highside of the sodstrip, actual location of sod strip high point could vary from this as the user attaches an appropriate marked point or alignment and profile. Therefore, this attachment point is more of layout time assistance rather than design point control.
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, such as a surface, alignment, or profile object in a drawing. For more information, see in the AutoCAD Civil 3D User’s Guide Help.
If marked points are provided, target parameters are unnecessary and will be ignored even if set. If marked points are not set and offsets or alignments are used to locate points, it is expected to set profiles through target parameters. If they are not, this subassembly takes its elevation from the surface set in the target parameter listed above.
Parameter |
Description |
Type |
Default |
|---|---|---|---|
Superelevation Axis of Rotation |
Indicates whether the subassembly supports the axis of rotation calculation. To view a description of the parameter, in the Properties window, hover the cursor over the parameter. For more information, see Profile Grade Line Adjustments During Superelevation. |
Static (Description) |
|
Sod Strip Slope |
Cross slope of designed sod strip | Numeric | |
Gutter Slope |
Gutter slope in the new curb and gutter subassembly | Numeric, positive |
This subassembly is used to place a new curb and gutter parametrically, and can optionally tie (with a sod strip) into either the inside edge of the existing sidewalk, or to a new sidewalk created with another subasembly. The horizontal placement of the curb and gutter is determined from the previously known flange point location. Highside of the sod strip can be located either by a fixed offset or any other marked point, such as the inside edge of sidewalk. Alternatively, this point can come from target parameters of an aligment and profile. Newly designed flange point, optionally marked so that it can be used as input later for replacement lane subassemblies.
Key steps in completing this conditional subassembly are as follows:
- Get existing pavement elevation at the flange point offset.
- Set flange point elevation based on the minimum lift value.
- Next insert curb and gutter points from P to P4 using the input parameters (similar to CurbAndGutterGeneral).
- If the inside sidewalk marked point is assigned, establish that point as P10. If marked point is not associated, look for target parameters for 'inside edge of sidewalk" alignment. If yes, then get profile elevation from the surface target parameter.
- If none of the above data is available for the highside of the sod strip, use the offset as dictated by attachment point to establish point P10.
- Find the slope between P4 and P10.
- Check whether that slope is within the parameters of Min/Max sod strip slopes.
- If it is lower than minimum, set the slope to minimum allowable and computed points P4 to P1 backwards. Similarly, if the slope is more than maximum allowable sod strip slopes, set it to maximum allowable and calculate P4 to P1.
- Check whether the elevation difference between P1 and P11 is within tolerable limits of max milling. If P is below P11 and difference is more than max milling, then abort, resulting in an error displayed in the event viewer.
All other curb and gutter links are inserted, based on the Input Parameter dimensions Dimension A - Dimension F. All dimensions must be positive, non-zero values. If a non-zero subbase depth is given, the subbase layer is inserted to the back of curb, and continues for the Subbase Extension width. The subbase layer closes to the bottom-back-of-curb as shown in the diagram.
In layout mode , this subassembly is set based on the attachment point and the default flange point offset from baseline. The width of the sod strip is computed by subtracting the curb and gutter total widt from "flange point to attacment point" distance. The minimum allowable sod strip slope is used to calculate the back of curb point from which the rest of the curb and gutter is drawn, using the input parameters given.
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.
