ORD Carriageway Tie-in Best-Practice

Hello,

I have reached the point in my project where I need to tie-in the carriageway (dual carriageway, channels and lane markings, both ends of the alignment, so 20 elements which must be aligned both horizontally and vertically)

I have searched the training and the communities, and haven't been able to find anything that goes through the best way to model these tie-ins to existing, how best to measure the required existing dimensions relative to the geometry.

Can anyone provide any guidance, or point me in the right direction?

Euan

Parents
  • How about using Point Controls? To control templates' points' location, you can tie them into linear elements both horizontally and vertically. 

  • Is that how you normally do it? My concern is that it's creating numerous controls that will be changing independently of each other, rather than a controlled pivot from the geometry to the central reserve and so on outwards to the hard strip and verge

  • There are several ways to do this:

    - From corridor tools: point controls via linear elements or Feature Definition, via Point Control with offsets set up;

    - Template Constraints: Parametric Constraints or Feature Definition Constraint;

    - Superelevation to tie in cross-slopes;

    I usually go for linear objects with Civil Rules at the tie-in/transition sections. ORD creates dynamic connections and when these linear objects are changed, the Corridors are updated on the fly.

  • Sorry, meant to come back to this earlier. What follows is the process I ended up foillowing, no idea if its near to "best practice" but it did what I needed it to do, though it just seems a bit more laborious than my MX process was, especially since getting even simple offset and gradient measurements from ORD is awkward.

    • Determine tie-in chainage (or chainages if Horizontal and Vertical have differing requirements).
    • Tie-in elements to be created in the Linear>Miscellaneous>Draft_DNC feature so that the level may be turned off when exporting the model.
    • Central Reserve tie-in
    • Horizontal
    • Create tie-in element extending beyond tie-in point and end of corridor
    • Measure offset from Geometry at tie-in chainage
    • Calculate 1:110 (2*55 for reverse curve at 120KPH) length of tie-in
    • Create Geometry for tie-in, extend if reverse curve radius below Desirable Minimum
    • Create complex, apply as Horizontal Point Control
    • Vertical
    • Create profile for the Horizontal tie-in geometry from the tie-in to the end of the corridor
    • Apply as Vertical Point Control
    • Measure crossfall in Cross Section View
    • Calculate relative turnover length based on maximum width to edge of CR from geometry through the tie-in
    • Apply crossfall turnover as Vertical Parametric Constraint
    • Carriageway Edges and Nearside Hard Strip tie-ins
    • Horizontal
    • Create tie-in element extending beyond tie-in point and end of corridor
    • Apply Horizontal Point Controls from tie-in chainage to end of corridor
    • Measure offsets from Geometry at tie-in chainage, calculate individual and total offsets from edge of CR
    • Calculate 1:55 lengths for tie-ins, individually and combined, use maximum calculated length for all tapers
    • If longer than CR tie-in geometry, consider extending CR tie-in
    • Apply Horizontal Parametric Constraints to amend Carriageway and Hard Strip/Shoulder widths
    • NOTE: If Horizontal and Vertical tie-in chainages are coincident, the Point Controls from the tie-in to the end of the corridor can be applied as a single Both Point Control
    • Vertical
    • Apply the terrain model as the Active Profile to tie-in elements
    • Ensure Superelevation Point Controls are priority 2 in Corridor Objects
    • Apply Vertical Point Controls from tie-in chainage to end of corridor
    • Measure CR to NS Carriageway Edge, and NS Carriageway Edge to NS Hard Strip crossfalls in Cross Section View
    • Calculate 1% relative rate of change lengths based upon start and end crossfalls and maximum widths over the tie-ins, use maximum calculated length for all turnovers
    • Amend the Superelevation Point Control chainage to the end of the turnover length
    • Apply Superelevation turnovers as Vertical Parametric Constraints
    • NOTE: If Horizontal and Vertical tie-in chainages are coincident, the Point Controls from the tie-in to the end of the corridor can be applied as a single Both Point Control
Reply
  • Sorry, meant to come back to this earlier. What follows is the process I ended up foillowing, no idea if its near to "best practice" but it did what I needed it to do, though it just seems a bit more laborious than my MX process was, especially since getting even simple offset and gradient measurements from ORD is awkward.

    • Determine tie-in chainage (or chainages if Horizontal and Vertical have differing requirements).
    • Tie-in elements to be created in the Linear>Miscellaneous>Draft_DNC feature so that the level may be turned off when exporting the model.
    • Central Reserve tie-in
    • Horizontal
    • Create tie-in element extending beyond tie-in point and end of corridor
    • Measure offset from Geometry at tie-in chainage
    • Calculate 1:110 (2*55 for reverse curve at 120KPH) length of tie-in
    • Create Geometry for tie-in, extend if reverse curve radius below Desirable Minimum
    • Create complex, apply as Horizontal Point Control
    • Vertical
    • Create profile for the Horizontal tie-in geometry from the tie-in to the end of the corridor
    • Apply as Vertical Point Control
    • Measure crossfall in Cross Section View
    • Calculate relative turnover length based on maximum width to edge of CR from geometry through the tie-in
    • Apply crossfall turnover as Vertical Parametric Constraint
    • Carriageway Edges and Nearside Hard Strip tie-ins
    • Horizontal
    • Create tie-in element extending beyond tie-in point and end of corridor
    • Apply Horizontal Point Controls from tie-in chainage to end of corridor
    • Measure offsets from Geometry at tie-in chainage, calculate individual and total offsets from edge of CR
    • Calculate 1:55 lengths for tie-ins, individually and combined, use maximum calculated length for all tapers
    • If longer than CR tie-in geometry, consider extending CR tie-in
    • Apply Horizontal Parametric Constraints to amend Carriageway and Hard Strip/Shoulder widths
    • NOTE: If Horizontal and Vertical tie-in chainages are coincident, the Point Controls from the tie-in to the end of the corridor can be applied as a single Both Point Control
    • Vertical
    • Apply the terrain model as the Active Profile to tie-in elements
    • Ensure Superelevation Point Controls are priority 2 in Corridor Objects
    • Apply Vertical Point Controls from tie-in chainage to end of corridor
    • Measure CR to NS Carriageway Edge, and NS Carriageway Edge to NS Hard Strip crossfalls in Cross Section View
    • Calculate 1% relative rate of change lengths based upon start and end crossfalls and maximum widths over the tie-ins, use maximum calculated length for all turnovers
    • Amend the Superelevation Point Control chainage to the end of the turnover length
    • Apply Superelevation turnovers as Vertical Parametric Constraints
    • NOTE: If Horizontal and Vertical tie-in chainages are coincident, the Point Controls from the tie-in to the end of the corridor can be applied as a single Both Point Control
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