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Typical Sections All graphics taken from Ch 3 of HDM

Typical Sections All graphics taken from Ch 3 of HDM. CTC 440. Objectives. Know what a typical section is and what may be included in a typical section. Typical Sections. Show the physical shape and highway elements to be used when the project is constructed

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Typical Sections All graphics taken from Ch 3 of HDM

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  1. Typical SectionsAll graphics taken from Ch 3 of HDM CTC 440

  2. Objectives • Know what a typical section is and what may be included in a typical section

  3. Typical Sections • Show the physical shape and highway elements to be used when the project is constructed • Typical sections are generally included in a set of design plans • Several sections may be needed to describe a project

  4. Typical Elements • Number and width of lanes/shoulders • Thickness of pavement layers • Item #’s • Payment limits • Cut/fill slopes • Ditch/gutter/curb/sidewalk locations

  5. Control Lines • Show how the typical section is located w/ respect to horizontal/vertical control • HCL-horizontal control line • TGL-theoretical grade line • POR-point of rotation

  6. Lane Width • Show typical lane widths

  7. Cross slopes & superelevation • Show typical pavt cross slope • Show superelevated sections

  8. Pavement Sections • Show pavement materials • Show thickness of various layers

  9. Superpave • New Superpave (from 1999) • Old design was the Marshall mix • Superpave more complicated (refer to HDM Ch 3 and Pavement Design Manual)

  10. Shoulders • Shoulder width/cross slope • Rollover limitations • Shoulder thickness/materials • Conventional (being phased out) • ESAL (full-depth • Shoulder break (0.7 m) • Guide rail placement • Lateral Support to the shoulder • Delineation • ARD-Audible roadway delineators

  11. Clear Zones • Distance from edge of traveled way to an actual obstacle or potential hazard. • If FO are to be removed typical sections should show clear zone • If not practical to provide a reasonable clear zone, a barrier system should be provided

  12. Barriers • Guide Rail • Box beam • Corrugated • Cable • Concrete Barriers

  13. Medians-width and treatment

  14. Curbs • Type • Non-mountable • Mountable • Traversable • Combination curb-gutter • Asphalt • Stone

  15. Gutters • Collect runoff • Use flattened and widened section for drives

  16. Sidewalks • Set back as far as practicable (snow storage, pedestrian space) • Thickness (100mm or 150mm@ drives) • Materials • Concrete • Asphalt (short-term) • Bricks or pavers (historical/aesthetic)

  17. Embankment (fill) slopes • For maintenance and safety--should be flat as possible • 1:3 max w/o guide rail • 1:2 w/ guide rail

  18. Ditches • Show ditch dimensions/slopes • Should provide traversable ditches (1:6 down; 1.2m-width; 1:4 out) w/in clear zone • If can’t provide traversable ditches consider guide rail (or use professional judgement—guide rails in themselves can potentially be hazardous)

  19. ROW Width • Sometimes shown on typical sections

  20. Modifications needing Typical Sections • Overlays • Cracking & Seating • Rubblizing • Lane Additions and Widening • Miscellaneous • Edge drains • Adding curbs to existing pavts.

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