Kentucky Transportation Cabinet s 3D Model Pilot Project Kevin Martin, PE Jason Littleton, PE Old School Thinking 2D Plans in a 3D world KYTC began requiring 3D submittals 3D models submitted are not QA/QC d Which files are currently submitted? Supplemental Information File Format(s) Notes Mapping files (3D).DGN Existing Manuscript Existing Ground Digital Terrain Data.DTM and.xml Existing digital terrain data of project area Coordinate Control Data Alignment Geometry Superelevation Report Proposed Roadway Model Proposed Manuscript (3D) ASCII.ALG and.xml.xml.dtm,.itl,.ird,.xml.dgn N,E,Z of control points and PR R/W monuments All centerline horizontal and vertical alignments Data file will contain information about superelevation transitions Proposed 3D model or roadway and approaches Includes existing contours and planimetrics as well as proposed features and project control points 1
What happens to these files? Contractor reverse engineers plans Documents (Sec 105.05) 1. Questions/Answers 2. CAP Report 3. Special notes 4. Special Provisions 5. Plans 6. Standard Drawings 7. Supplemental Specs 8. Standard Specs What is AMG? Automated Machine Guidance GPS Guidance It is not inserting a CD and letting the bulldozer go Experience of operator plays a role What is AMG? 2
Winds of Change In 2011 Pilot project adopted Met with KY Assoc. of Highway Contractors What did the contractors say? They verify model and recreate if necessary LandXML Format Finished grade Subgrade too! Longitudinal features only Continuous where possible Roll Proposed Manuscript Many errors in what is submitted currently Why use AMG? KAHC members thoughts Decreased change orders Decreased bids Better product Other perceived benefits Catch design errors before construction Better inspection Better communication of intent 3
KYTC s 3D Pilot Project KY 7 in Elliott County from KY 885 to Grayson Lake Project Termini Modeling KY 7 InRoads XM (and later V8 and V8i) was used to model the project Mainline, Approaches, Entrances, Radii, Ditches Changes incorporated in Roadway Designer Brainstorming Sessions Met with Division of Construction and State Highway Engineer s Office Project Goals 1. Determine Best Modeling Practice 2. Determine best submittal to contractor 3. Determine role of designer after letting 4. Create dialog between Design/Construction/Contractor 5. Set new policy for better models 4
More Brainstorming Contractor must use supplied model Inspectors check vs. supplied model Partnering between KYTC and contractor Model available pre-bid Mandatory Pre-Bid Meeting KYTC 3D model will be record model Special Notes Special Note for the Use of a 3D Design Model Contrary to Section 109.01.01 3D terrain models of the proposed finished and subgrade surfaces have been provided The contractor shall use the provided surface model for the construction of the project using GPS machine guidance KYTC shall use the same model to inspect the contractor s work. More Special Notes Special Note for the Use of a 3D Design Model Cont d Contrary to Section 105.05 in case of a discrepancy between contract documents, the 3D surface model shall overrule the contract plan set. The ranking shall be: 1. Q&A from Division of Construction Procurement website 2. CAP Report 3. Special Notes 4. Special Provisions 5. 3D Surface Model 6. Plans 7. Standard Drawings 8. Supplemental Specifications 9. Standard Specifications 5
Even More Special Notes Special Note for Corrections to 3D Surface Model Any changes to the initial 3D surface model due to errors or omissions shall require a minimum of 72 hours to complete at the discretion on KYTC. All requests shall be sent to the Engineer, who will coordinate with the Division of Highway Design to investigate and correct. Any value engineering proposal that requires edits to the initially furnished 3D surface model shall be processed within 5 working days after the Cabinet approves the requested VE proposal. Still More Special Notes Special Note for Mandatory Progress Meetings the contractor shall schedule meetings with KYTC representatives including, but not limited to Central Office Design, Central Office Construction Field Engineer and District Construction crew. The purpose of these meetings is to receive feedback on the use of the 3D surface model for the construction of the project. The meetings shall be coordinated at milestones determined by the engineer. Contractor to provide feedback Lots of Special Notes Special Note for Earthwork Quantity Calculation Contrary to Section 204.04.02 Earthwork quantities were calculated using InRoads triangle volumes instead of end-area volumes from cross sections Major errors are defined as individual mistakes of 3 percent of more in quantity of earthwork between two consecutive cross sections as shown on the earthwork volumes sheets. 6
Pre-Bid Meeting Covered KYTC goals for project Ultimate purpose of this project is to refine the creation of models to make them more useful to contractors. Covered Special Notes KYTC Expects winning contractor to provide feedback Pre-Bid Meeting Questions One model How to handle slope adjustments How to handle landslides/undercuts Payment Pre-Letting Question Diversion Models 7
Contractor Feedback USACE permit has been granted for this project Currently waiting on USACE permit for waste areas Project Progress Lessons Learned from Industry What have we learned from discussions with contractors software vendors? One merged surface with ML, Apprs., Entrs., etc Subgrades on multi-surface submittals Horizontal and Vertical alignments Bid Quality vs. Build Quality 8
So Where Do We Go From Here? 2 nd Pilot Project and beyond Develop Best Practices for 3D Modeling 3D Model expectations Suggest guidelines for AMG applicability What about Electronic Submittals? Updates to electronic submittals SS3 Upgrade (file types) DXF files Coordinate Control file Cross Section Report files Kevin Martin, PE Developmental Branch Manager Kevin.Martin@ky.gov Jason Littleton, PE Project Engineer Jason.Littleton@ky.gov 9