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Comprehensive Overview of TS&L Expectations in Bridge Design and Construction

This document outlines the essential expectations and inclusions for Transportation Systems & Layout (TS&L) designs, as per BDDM guidelines. It details the required elements of a TS&L plan, including plan and elevation drawings, cost estimates, and the narrative justification for selected design packages. The importance of considering multiple bridge alternatives is emphasized, including options such as ABC versus Conventional and various material types. Additionally, it discusses crucial components in narratives, including unique design elements and discussions on alternate types. The document serves as a crucial checkpoint for ensuring thorough project planning.

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Comprehensive Overview of TS&L Expectations in Bridge Design and Construction

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  1. TS&L Expectations What is included in a TS&L?

  2. TS&L Expectations Per BDDM 1.1.2.11 – The end product of a TS&L design includes: • TS&L Plan and Elevation Drawing • TS&L Estimate of structure construction cost • TS&L Narrative Also necessary to justify the package above: Sketches of alternate bridge types considered Cost estimates of alternate bridge types considered

  3. TS&L Expectations What other important element is missing? TS&L Checklist

  4. TS&L Expectations How many alternates should be considered? 3 – Including the selected type

  5. TS&L Expectations What kind of alternates can/should be considered? ABC vs. Conventional Single Span vs. Multi-span Steel vs. Concrete Spliced / PT Precast vs. Cast-in-Place A 1010 Steel Spread Footings vs. Piles Precast Decks Bridge vs. Culvert Precast caps

  6. TS&L Expectations What is included in the TS&L Narrative?

  7. TS&L Expectations BDDM 1.1.2.11(3) lists a general outline of possible discussion items. The word “possible” in the above does not really capture the expectation. The wording needs to be changed to say something like, “… a general outline of discussion items. Include all items that apply.”

  8. TS&L Expectations Include all applicable items in the list plus: Discussion of alternate types considered or reasons why alternates were not considered. • Discussion of any unusual design elements, such as: • Sheet pile abutments • Aesthetic treatments • Experimental features • Special features required by other agencies

  9. TS&L Expectations Questions / Comments ? A draft BDDM update will be prepared for the April 2012 update.

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