OverlayMillLevelCrown

This subassembly adds an overlay layer to an existing crowned carriageway, with either a levelling and milling layer added as required.

Attachment

The attachment point is the crown point of the overlay layer with finished ground crossfall.

Input Parameters

Parameter Description Type Default
Crown Offset Positive or negative offset of the crown point Numeric 0.000m
Design Lane Width same as Existing Lane Width
  • Yes

    Specifies that the design lane width is the same as existing lane width.

  • No

    Specifies that the design lane width is not the same as existing lane width.

    Note: If No is selected, the Inside Edge of Existing Lane and Outside Edge of Existing Lane parameters will not be applied to the subassembly.
User defined No
Inside Edge of Existing Left Lane This is the start point for calculating existing ground slope for the left lane Numeric 0.000m
Inside Edge of Existing Right Lane This is the start point for calculating existing ground slope for the right lane Numeric 0.000m
Outside Edge of Existing Left Lane This is the end point for calculating existing ground slope for the left lane Numeric 12.000m
Outside Edge of Existing Right Lane This is the end point for calculating existing ground slope for the right lane Numeric -12.000m
Use Profile Options Select to tie the inside edge of an overlay to a profile, or adjust level to minimum level depth User defined Minimum Level Depth
Overlay Depth Depth of the overlay layer Numeric, positive 0.300m
Right and Left Overlay Slope Options Specifies right and left overlay slope options
Tip: Flapping is a term used to describe how the Corrected Crossfall for an overlay in a rehab subassembly is calculated. Flapping outcomes are different, relative to the Slope Tolerance and the Slope Difference between existing ground crossfall and ideal crossfall. If the Slope Difference is less than the Slope Tolerance for the subassembly, then the use case is considered 'within tolerance'. If the Slope Difference is greater than the Slope Tolerance for the subassembly, then the use case is considered 'without tolerance'.
Note: Slope Tolerance is an absolute value. Therefore, for either a Slope Difference of 0.4% or -0.4%, both have an absolute value of 0.4%. If the Slope Tolerance is 0.5%, the 0.4% absolute Slope Difference would be considered within tolerance.
  • User Defined with Flapping
    Flapping specifies how the Corrected Crossfall will be calculated, relative to the slope tolerance for the subassembly
    • Flapping Within Tolerance:

      Corrected Crossfall will be set as close as possible to the Existing Ground Crossfall and will also attempt to meet Minimum Level Depth

    • Flapping Without Tolerance:

      Corrected Crossfall will be set as close as possible to the Existing Ground Crossfall within Slope Tolerance

  • User Defined Without Flapping
    Flapping specifies how the Corrected Crossfall will be calculated, relative to Slope Tolerance for the subassembly
    • Flapping Within Tolerance:

      Corrected Crossfall will be set equal to Ideal Crossfall

    • Flapping Without Tolerance:

      Corrected Crossfall will be set as close as possible to the Ideal Crossfall, within Slope Tolerance.

  • Outside/Inside Lane Superelevation
    Outside or Inside Lane Superelevation will replace Ideal Crossfall. Corrected Crossfall values for the overlay layer will be defined by the superelevation table for the section instead of the Ideal Crossfall.
    Note: If Outside/Inside Lane Superelevation is chosen but the alignment for the rehab corridor doesn't have a superelevation table defined, Ideal Crossfall will be used instead.
  • Match Slope

    The Corrected Crossfall is always set equal to Existing Ground Slope

  • Use Ideal Crossfall

    The Corrected Crossfall Slope is always set equal to Ideal Crossfall

User defined User Defined Without Flapping
Left Ideal Crossfall Specifies user defined left ideal crossfall User defined, numeric -2.00%
Left Minimum Level Depth The minimum level depth between the existing surface and the bottom of the left overlay layer Numeric, positive 0.600m
Left Minimum Mill Depth The minimum mill depth below the existing surface and the bottom of the left overlay layer Numeric, positive 0.300m
Left Slope Tolerance Tolerance for varying the left overlay slope Numeric, positive 0.50%
Right Overlay Slope Options Specifies right overlay slope options User defined User Defined Without Flapping
Right Ideal Crossfall Specifies user defined right ideal crossfall Numeric -2.00%
Right Minimum Level Depth The minimum level depth between the existing surface and the bottom of the right overlay layer Numeric, positive. 0.600m
Right Minimum Mill Depth The minimum mill depth below the existing surface and the bottom of the right overlay layer Numeric, positive 0.300m
Right Slope Tolerance Tolerance for varying the right overlay slope Numeric, positive 0.50%
Left Lane Width The left lane width, determined by the offset of the outside edge of the left lane from the inside edge of left lane Numeric, negative. -12.000m
Right Lane Width The right lane width, determined by the offset of the outside edge of the right lane from the inside edge of right lane Numeric, positive. 12,000m

Output Parameters

Parameter Description Type Default
Left Corrected Crossfall This is the adjusted crossfall for the left side of the road, which has been optimised to match, as closely as possible, the rehab subassembly parameters you specified. Numeric, negative -2.00%
Right Corrected Crossfall This is the adjusted crossfall for the right side of the road, which has been optimised to match, as closely as possible, the rehab subassembly parameters you specified. Numeric, negative -2.00%
Left Existing Ground Slope The crossfall (%) of the existing ground profile for the left lane, calculated from the inside edge of the left lane to the outside edge of the left lane. Numeric, negative n/a
Right Existing Ground Slope The crossfall (%) of the existing ground profile for the right side of the road, calculated from the inside edge of the right lane to the outside edge of the right lane. Numeric, negative n/a

Target Parameters

Parameter Description Required?
Target Surface Name of the surface defining the existing carriageway Yes
Crown Offset Target Name of the object defining the offset of the crown point. The following object types can be used as targets for specifying this offset: alignments, polylines, feature lines or survey figures. No
Left Lane Width Target Name of the object defining the offset of the outside edge of left lane . The following object types can be used as targets for specifying this offset: alignments, polylines, feature lines or survey figures. No
Right Lane Width Target Name of the object defining the offset of the outside edge of right lane . The following object types can be used as targets for specifying this offset: alignments, polylines, feature lines or survey figures. No
Left Inside Edge of Existing Lane Offset Target Name of the object defining the left inside sample point offset will be used to calculate the existing surface slope. The following object types can be used as targets for specifying this offset: alignments, polylines, feature lines or survey figures. No
Left Outside Edge of Existing Lane Offset Target Name of the object defining the left outside sample point offset will be used to calculate the existing surface slope. The following object types can be used as targets for specifying this offset: alignments, polylines, feature lines or survey figures. No
Right Inside Edge of Existing Lane Offset Target Name of the object defining the right inside sample point offset will be used to calculate the existing surface slope. The following object types can be used as targets for specifying this offset: alignments, polylines, feature lines or survey figures. No
Right Outside Edge of Existing Lane Offset Target Name of the object defining the right outside sample point offset will be used to calculate the existing surface slope. The following object types can be used as targets for specifying this offset: alignments, polylines, feature lines or survey figures. No

Behaviour

This overlay layer assumes that flapping is applied within slope tolerance. Level at the crown will meet both sides of the carriageway.

Point, Link and Shape Codes

Point, Link or Shape Code Description
P1, Crown Crown point for top of overlay
P2, P3 EOV Edges of overlay for finished gradient
P4 Crown_Overlay Crown point for bottom of overlay
P5, P6 EOV_Overlay Edges of bottom of overlay for left and right side of the road
P7 Crown_Milling Crown point for top of mill
P8, P9 EOV_Milling Edges of mill for right and left side of road
L1, L2 Top, Pave Top of overlay for left and right side of the road
L3, L4, L5, L6 Overlay Overlay links for the left and right side of the road
L7, L8 Level, Mill, Datum Links for the milling layer
L9, L10 Level Level links for the left and right side of the road
L11, L12 Mill Mill links for the left and right side of the road
S1 Overlay Area between the top and bottom of the overlay
S2 Level Area between the top and bottom of the elevation
S3 Mill Area between the top and bottom of the mill

Coding Diagram

Parent topic: Subassembly Reference (continued)