working with 3d models in design & construction panel discussion 1

Alexa Mitchell, P.E.CADD Services EngineerMoDOT

Working with 3D Models in Design & Construction

Panel Discussion

1

Matthew PostonCADD TechnicianFred Weber, Inc.

Topics for Discussion

• Status of 3D modeling at MoDOT

• Discuss what 3D model outputs are useful in construction

• Describe applications of 3D models in construction

2

MoDOT’s Current Digital Plans DeliveryElectronically Signed & Sealed Vector PDF’s

3 Source: MoDOT and Bentley Systems, Inc.

PowerGeopak

Current creation of the 3D Design ModelToday’s Level of Detail

• Existing terrain collected using helicopter LiDAR (accuracy of data is certified at +/- 0.3ft).

• Design model prepared for projects with cross sections and earthwork pay items.

• Design model prepared for linear corridors and major intersections only. Entrances and bridges are NOT modeled at this time.

• Purpose for the model is to develop plan sheets

4

Digital Engineering Data Delivery -TODAYProvided Pre-Bid for Information Only

5

Type of Project Digital Data Provided

Projects with significant amount of cross-sections

Survey control points, available alignments and profiles, existing DTM, PFG surface, and when possible a subgrade surface.

Future of 3D Design Model

6 Source: Parsons Brinckerhoff & ARA for FHWA

TypeDensity

FormatTiming Authorized Use

For the Purpose of Automated Machine Guidance

Grading Surface

Pavement Surface

Base Surface

Future of 3D Data Delivery

Type of Project Digital Data Provided Format

Bridge and/or Resurfacing

Survey control points, available alignments and profiles

LandXML, and native PowerGeopak

Reconstruction• Widening • Guardrail

Survey control points, existing DTM, available alignments and profiles, 3D string-lines, all available proposed surfaces, such as subgrade, aggregate, and pavement of the reconstruction

LandXML and native PowerGeopak for cogo & surfacesDGN for 3D line-strings and plan graphics

Expansion/New Construction

• Paving• Intersection Improvements

Survey control points, existing DTM, available alignments and profiles, 3D string-lines, all available proposed surfaces, such as subgrade, aggregate, and pavement of all new construction

LandXML, and native PowerGeopak for cogo & surfacesDGN for 3D line-strings and plan graphics

Provided Pre-Bid for Information Only

7

CONTRACTOR NEEDS TO SUPPORT 3D MODELSFOR AMG AND STRINGLESS PAVING

THE DIFFERENT USES OF ELECTRONIC FILES• BID DOCUMENTS

• PLAN VERIFICATION• AMG CONTROL• 3D MODELING

Contractor Use of 3D Models

9 Source: AGTEK

Bid Documents


10 Source: Sundt Construction and AGTEK

Plan Verification


11 Source: Topcon, Trimble, GOMACO, Leica, MoDOT

AMG Control

Excavation

Trimming/Milling

Horizontal LayoutsConcrete & Asphalt Paving

Grading and Base

AMGConstruction Management

How Contractors Use 3D Models

12 Source: Parsons Brinckerhoff and ARA for FHWA

3D Model

Analyze DataMeet with

Project Managers

Supplement/ Recreate Models

Review Means & Methods

Review & Back-check

Models

Create Grading & Utility Models

Share models with Engineering and Subcontractors

Migrate Data to the Field

13 Source: MoDOT

Any Questions?

Thank You