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In ordinary road pavement, the different layers are normally laid out parallel to the Road Pavement Description. With the rehabilitation function, the lower edge of the designated road pavement can be forced to meet with the top surface of the existing road.
This assimilation will only happen at each cross-section and not along the length of the road alignment.
The starting point for the assimilation is the terrain top surface, where an existing road will be defined based on illustration codes for the right and left road edges.
Against the surface delimited by the road edges, it is possible to have the road pavement assimilated.
Refer to the topic Rehabilitation - Examples for graphical illustrations.
Run the function from the following location of the floating window 'Road Model':
MOUS_ICO Toolbar: Not available from Toolbar
MOUS_ICO Menu: Data > Road Pavement > Rehabilitation
The dialog box Rehabilitation (shown below) will pop up.
Note: For the Rehabilitation to work the alignments used for the rehabilitation has to be added as Illustration Objects to the road model.
Rehabilitation can be defined for a given section by entering values for the From and To stations.
Assimilation should be carried out between the left and right edges of an existing road.
To define other delimiting points, define a reduction of the effective width.
This might be applicable if the fill-out on the edges is of such poor quality that a full road pavement should nevertheless be built there.
The distance within the edges of the existing road at which assimilation has to begin should be defined as a reduction of the effective width.
The width will be defined in meters and can be different on the left and right sides.
The pavement thicknesses found under road surface 1.01 are added here.
If the height difference between the new and existing road is less than this value, a full road pavement will be laid out, without assimilation.
The layer depths defined in the Road Pavement Description will be used.
The value can be within the total road pavement thickness.
For several section descriptions, SECTION FROM will be used to look for the road pavement description within which this profile is situated.
Maximum values for the thickness of the individual layers should be defined as somewhat greater than the normal thickness (cannot be defined for sub-base 2).
The road pavement layers will be laid out until the limit for maximum layer thickness is reached.
When the limit is exceeded, the normal thickness for the layer will be used and the assimilation will now occur in the layer below.
The minimum thickness for each individual layer need not be defined. This is equal to the difference between the maximum thickness and the normal thickness for the overlying layer.
Wearing course will always be included when doing rehabilitation as it is the uppermost layer and because a perfect match between the new and old road will never be 100% identical.
However, if you would like to always include any of the lower layers with at least the minimum thickness then check the box for Use for rehab. All layers above will be added with standard pavement thickness from the normal pavement description.
The width here is defining the minimum width of the roadbed for the new pavement outside of the road edges. If the rehabilitation function detects that this width is too narrow it will extend the new pavement into the old/existing pavement.
The use for this function is to make a design that will meet the construction equipment on sight for a more effective build, i.e. not making too small strips of new pavement not suited for the equipment the contractor has.
The width here is defining the minimum width for the old/existing pavement at the level of the roadbed of the new pavement.
The use for this function is to set a minimum width of the existing road before the existing road is considered to small to keep. When the width of the existing pavement gets too small it will remove it completely and replace it with new pavement in the full cross-section.
A fixed depth to remove material in the existing pavement before adding the new design. Normally 4 cm for the existing wearing course is removed so that the new wearing course can be added in its place. Alternatively, no fixed scarifying is added and the user could place the new road some centimeters above the existing road instead.
In some cases, additional scarifying (removal of the existing pavement) could be done to save the existing pavement and not replacing it with new pavement where it is not needed. Examples of this could be in situations where we know the existing road has had multiple layers of wearing courses added as part of the maintenance of the topmost surface. To keep most of the existing pavement at the end solution additional scarifying will remove material where the new road surface dips to low.
Use feature type to pick between line objects included in the tasks illustration objects as reference for the left and right road edges for the rehab function.
Use alignment to pick line tasks from the model to use as left and right road edges for the rehabilitation function.
For the left and right side definitions it is possible to define how far out to the sides the rehabilitation can go, limited by the selected alignments.
Pick the edge lines for the rehabilitation function.
In cross-sections where the rehabilitation extends all the way to the left or right, the crossingpoint between the side slope and the edge line will be at the roadbed level. The drop-down allows the user to move the crossing point to a different pavement layer, or to the existing terrain.
Existing terrain/roadsurface is at the elevation of terrain, subtracted of the scarifying.
Choosing a pavement layer it will cross at the pavement layer, but will never move the crossing point higher than the terrain surface (minus scarifying)
The extra distance is added as positive (+) when the new pavement should be placed closer to the reference alignment of the new road model. This is a horizontal displacement.
Use negative (-) values to move the start of the new pavement further away from the reference alignment of the new road model. This is a horizontal displacement.
This is the slope of the transition from the new pavement to the existing pavement.