roadway designer resurfacing restoration and rehabilitation

Date

Roadway Designer Resurfacing Restoration and Rehabilitation

Kevin Jackson, Technical Director, TLIBentley Systems, Inc.

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Overlay / Milling

Components

Vertical Adjustment

s

Cross Slope

Optimization

Roadway Designer Overlay Tools

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Objectives – Overlay Components

Overlay Components

Stripping Components

Quantities and Reports

Cross Slope Optimization

Vertical Adjustments & Alignments

Overlay Tools – Overlay / Stripping Components

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Add New Component > Overlay/Stripping

• Top Option

• Bottom Option

• Follow Surface

• Follow Component

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Overlay Component

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• Create Pave + Overlay Template– Drag the Overlay_Only template into it so

that the bottom of pavement and Overlay points merge.

• Test

• Run Roadway Designer– Change to Pave+Overlay template– Note that Overlay now extends full width

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Stripping Component

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• Create a Pavement+Overlay template– Add a Milling Component– Match the bottom three points

• Test

• Create a Pavement + Overlay + Milling Component

• Run Roadway Designer

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Multiple Layers

• Different Overlay Layers?– Use Follow Lowest / Follow Highest

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• Review the 05_OverMill_Complicated Corridor (multiple overlay layers, saddlebags, quantities)

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• Standard: End-Area Volume Reports• Quick: Component Quantities

– Provides Component Quantities and Costs– Not exact: good for quickly comparing alternatives– For “complete” quantities use the full End-Area Volumes

functionality

Component Quantities

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• Run Roadway Designer

• Launch Component Quantities

• Walk the Corridor

• Disable Parametric Constraints

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• Reports on Overlay/Stripping components that have the Stripping option set.

• Milling Stylesheet (set Default)

Milling Report

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• Generate a Milling Report

Overlay Tools – Vertical Adjustments

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• Overlay

• Overlay + Max Milling

• Min. Milling w/ & w/o Max. Milling

Vertical Adjustment Scenarios

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• Structural Integrity of new Backbone• Minimum amount of overlay material (minimum overall

overlay thickness)• Full-width Milling• Milling: maximum depth of high-point milling

Vertical Adjustments: the Engineering

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• Given a template, it determines the Template Top.– This is the triangulated surface– Regardless of the complexity of the template, the Top is a

simple left-to-right linestring

• It compares the vertices in the Top to the vertices in the Active Surface

• It finds the Minimum (or Maximum) Vertical Difference value

• It adds the Backbone Thickness, Overlay and/or Milling values to determine an Adjustment Value.– Adjustment is completely independent of anything other than

the Top line and the Surface

Vertical Adjustments: the Methodology

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• Determined from Top segments in the template– Everything under the top ignored

• The Backbone Thickness is used in Adjustments

Template Top

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• Horizontal Range of Comparison must be defined

• Template Top– User Selects Two Template Points to define the left and right

ends

• Existing Ground Range– Use the Template Points used for the Top– Or - Follow Alignments, Features or Styles– Or - Fixed Offsets

Vertical Adjustments Horizontal Range

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• Solution Options– Compare at Template Points Only or at all Section Points– Maximum Difference can be set

Vertical Adjustments Comparisons

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Critical Points and Vertical Delta• Only Two Comparison Points/Vertical Deltas matter:

• Zero Overlay Point and Minimum Milling Point

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Vertical Adjustment GeometryCritical Point =

• Min. Milling Point for Min. Milling

• Zero Overlay Point for Overlay

Critical Delta =

• Existing Surface Elev. - Template Top Elev. at the Critical Point

• Direction matters

• + is up, - is down

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Minimum Milling•Top is moved to the lowest position where it intersects the existing surface•Establishes “Bottom” of backbone

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• Backbone Thickness (always positive) is added to the (positive or negative) Min. Milling Delta– Adjustment = Min. Milling Delta + Backbone Thickness

Backbone Thickness

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• In Roadway Designer select the 02_Pavement* Corridor

• Select Display Mode: Overlay

• Vertical Adjustments:

• Set Template & ex Ground Range

• Select Use Minimum Milling

• Walk the Corridor, observe

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• Step 1: Find the Minimum Overlay point: the intersection between the top and the existing ground where the Top is highest

Minimum Overlay

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• Minimum Overlay Value– Between Backbone Bottom and high point of existing

(Minimum/Zero Overlay Point)– Zero or greater– Added to Adjustment

Overlay Settings

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• Steps 2 and 3: Add the Minimum Overlay Value to the Zero Overlay Delta and add the Backbone Thickness

Minimum Overlay

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• In Roadway Designer select the 02_Pavement* Corridor

• Select Display Mode: Overlay

• Vertical Adjustments:

• Set Template & ex Ground Range

• BB=0, Min Overlay = 0

• Walk the Corridor, observe

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• Change the Backbone Thickness to 0.2 ft [0.1m]

• Walk the Corridor, observe

• Change the Minimum Overlay to 0.2 ft [0.1m]

• Walk the Corridor, observe

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• Sets a maximum limit to milling• Milling is limited to

– Maximum Milling Value or– Minimum Milling Point (full-width milling)

Minimum Milling with Maximum Milling

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• Set to Minimum Milling

• Select the Maximum Milling option

• Key in 0.1 [0.05]

• Walk the Corridor, observe

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• Mills out High Points• Requires less Overlay Material than with no milling• Can save significant money

Minimum Overlay with Max Milling

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• Milling Adjustment value is the last adjustment

• Total Adjustment is never negative

• Milling Adjustment is limited by– The Max Milling Value or– Zero Adjustment point

Minimum Overlay with Max Milling

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• Change the Maximum Milling depth to 0.1 [0.05]

• Walk the Corridor, observe

• Change the Corridor Vertical to None

• Walk the Corridor, observe

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• Vertical Adjustments do not require vertical alignments• Components behave the same regardless of how

they’re controlled vertically.

• To “Permanently Save” the Adjustments you’ll need to make an Alignment:– Smooth Adjusted Vertical Alignment– Apply Adjusted Vertical Alignment

• Final Cleanup: can use standard alignment tools

Vertical Alignments

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• Smooth the Vertical Adjustment

• Save the Vertical– envelopes

• Review the Vertical

• Push the Corridor w/o Adjustments (go w/ adj. to see if the Adjustment deviates from 0.0)– If different: verify that the Adjustment

settings were the same