3-d modeling implementationremlinedigital.com/mdqi/images/stories/mdqi... · wisdot model concept...

3-D Modeling Implementation

Presented January 31, 2013

Douglas Townes FHWA – Resource Center

WORKFLOW FOR ELECTRONIC DATA TRANSFER WHEN USING AMG IN

CONSTRUCTION

Charles Jahren, PhD

Iowa State University

OVERALL DIAGRAM

FIRST SECTION

DETAILED SURVEY

DETAILED DESIGN

SECOND SECTION

Contractor Modeling Workflow


Are the electronic files

included?


with vector data?

NO

NO

YES

YES

Obtain the data files and plans from the

owner


Import data into Software

Shoot survey Data . Verify with Owner Survey Data

Digitize the site boundary, contours and other elements

(tedious and time consuming)

Verify/refine existing surface data in register

Verify Owner Survey Data


Paper CAD Drawings

Shoot Survey Data. Verify with Owner Survey Data




Build electronic data surfaces. Verify with the

owner plans

Build electronic

data model from scratch

Build electronic models

using some owner data

Build cyberspace project using

4-D

Build the project in cyberspace

using 4-D

Convert to machine ready file


paper plans


4-D


Obtain the data files and plans from

the owner

NO

NO

YES

YES


included?


with vector data?



Shoot survey Data . Verify with Owner Survey Data



Verify/refine existing surface data in register

Verify Owner Survey Data


Paper CAD Drawings

Shoot Survey Data. Verify with Owner Survey Data





owner plans

Build electronic

data model from scratch

Build electronic models

using some owner data


4-D


paper plans


4-D

Build the project in cyberspace

using 4-D

Convert to machine ready file

What is the Take Away?

Try to find a way to Green!

Implementing a Model

Based Approach to Design

at Wisconsin DOT

August 21, 2012

WisDOT Methods Development

Topics

• WisDOT Civil 3D implementation status

• WisDOT model oriented design workflow

• Implementing 3D Surface Model Deliverable

• Future of Roadway Models at Wisconsin DOT

• Implementing Civil 3D Specific Delivery

Requirements

WisDOT Model Concept

Definitions

• 3D Surface Model

• Produced for projects with Grading work

• Includes surfaces for AMG operations of Grading, Base

Course, and Paving

• Initial model deliverable requirement will be 3D Surface

Models

• Roadway Model

• Evolution of model concept to include information for

increased utility in design and construction processes, and

ultimately expanded to downstream roadway lifecycle

processes

Model-Based Design Part of WisDOT

Implementation of 3D Technologies in

Design & Construction

Plan with Five Active

Initiatives:

• Statewide Real-Time

Kinematic GPS Network.

• DTM Data Collection.

• 3D Design.

• Automated Machine

Guidance.

• Field Technology and

Inspection.

Requirements of the Design

Workflow

• Civil 3D Design Workflow goal to develop

construction ready surface models during

the design process

• Must produce surface models with

sufficient detail to support AMG

operations

• 3D Surface Model output must be

synchronized with plan sheets

Model Sharing Pilots

• Determine Benefits of Providing 3D Roadway Models at Pre-

Bid.

• Determine Utility of 3D Models for Bid Preparation.

• Establish Requirements for “Construction –Ready” 3D

Models Flowing from Design Process.

• Includes Model Content and Format.

• Field Test “Construction Readiness” of 3D Models.

• Identify and Implement any Changes to Design Workflows

Necessary for Achievement of “Construction Readiness” in

3D Models.

Model Sharing Pilots Results

• Surface Model was used in bid preparation activity

• Plan activities to greater level of detail, reducing uncertainties

• Identify potential sites for borrow/waste, and communicate with

property owners

• Surface models were construction ready – validated design

workflow

• Model content changes

• Add longitudinal breaklines as visual aids for operators

• Add surfaces for all subbase layers

• Staged models not needed for AMG operations

3D Surface Model Requirement

• WisDOT will implement a 3D Surface Model

Delivery Requirement on projects starting

after July 2014.

• Model content requirements and other

details will be released Q4 of 2012.

3D Surface Model Content Concepts

3D Surface Model Content Concepts

• Surfaces

Exist Top Finished Base Course Subbases Datum Pavement

• Surface model data density will be design speed dependent

• Surface models must be synchronized with plan sheets

• Additional content

• Longitudinal breaklines

• Horizontal alignments

• Vertical alignments

• Superelevation transition information

• Fully staged model requirement will be decided on project-by-project

basis

Roadway Model Evolution

• Ability to increase information included with the

3D Model will grow

• Methods of accessing information will become

easier

• WisDOT looking to expand use of Roadway

Models in:

o Integration with GIS

o Operations

o Design

o Construction

o Maintenance

o Planning

How Can Our Roadway Model Goals Be Met?

• To answer this question WisDOT has:

• Learned more about how model design

software functions & compatibility between

software

• Monitored “TransXML” Development

• Monitored collaborative efforts between

Bentley and Autodesk

Contractor’s perspective

Several of the following slides came from a presentation by Edgerton Contractors, Inc. of Oak Creek Wisconsin. They have been reproduced and paraphrased here as “typical comments” from a contractor using Automated Machine Guidance (AMG)

• GPS represents 15% to 25% of the cost of new machines

• GPS machines require more frequent maintenance: pins, bushings, cutting edges

• Three full-time personnel: Data Manager, Survey Coordinator/Manager, Engineering Manager

• GPS Machine Guidance Training – creation and distribution of ‘YouTube’ style videos via the internet

• GPS Rover Training - annual classroom session, one-on-one, regular assessments, 12 month process

• Three year hardware development cycle

• Continuous software and hardware beta testing for new hardware

Typical Contractor Investment when incorporating AMG

• Pre-build the project – plan check and RFI’s

• Night Work efficiencies improved

• Alignment-based design alternatives

• Design and Visualization of interim surfaces which provide drainage, construction access without over-excavating

• Match existing grades for temporary wideners or cross-overs

• Existing Grade to subgrade in one operation

• Planning tools / confidence to execute ever challenging construction sequences

Typical Contractor Project Management changes

Pre-Build the Project – RFI (example)

RFI: ECI-042, Wall 420 • Horizontal Alignment of Wall • Curve Table inconsistent with

coordinate callout. • N 0.05-ft, E 1.82-ft

Night Work

Advantages of AMG at night: • Accurate grading in spite of reduced visibility • Increased safety due to fewer personnel on the ground

Design Alternatives

Temporary Alignments: NSB-NWA • Eliminated a traffic switch. • Saved three weeks on the schedule.

Constructability Issues

• Interim Surfaces • Visualization during planning • Means and Methods • Confirm safe slopes and adequate storm water control

This is actually an example of 4-D design by the contractor

• The Team: – Owner and contractor representatives

– CAD operators, surveyors, inspectors

– Skilled, take pride in their work, just want to build a good project

• Operational framework: – Divide the work.

– Collaboration – not competition.

– Share everything.

– Trust but verify.

• Success in this step solves half the problems.

Team Effort

• Owner specification must identify how site “Site Calibration” will occur – One example: “Designate a set of control points including

a total of at least 6 horizontal and vertical points…”

• Owner selects and sets the control points. – Owner’s surveyor measures and then publishes XYZ

coordinates on each point for all GPS users on the project.

• Contractor and owner share the responsibility of

collaborating the set points. • Contractor to set base station locations. • Contractor verifies these points

Survey Control Points

• Goal: Provide the generic information that can be used by anyone using any GPS system to stake or grade the site consistent with the Owner’s surveyor-of-record.

• Definition: Published list of the NEZ coordinates and LLH coordinates for each control point.

• All users of the data must verify internal consistency of the data before using for construction.

Site Calibration

• Construction surfaces are defined as electronic data representation of the owner’s design surfaces that can be loaded into survey and machine guidance instruments.

• Contractor is responsible for the creation and implementation of Construction Surfaces.

• The Contractor must verify that the construction surfaces match the owner’s design surfaces before using the data in the field.

• Any and all errors are fixed by the Contractor prior to construction.

Construction Surfaces

• CAD files reduce model costs significantly.

• Format: Land XML

• Include: – Alignments – Horizontal and Vertical

– All surface lines on Plan Details

– Pre-Construction Topographic Survey

– Finish Grade Surface: break lines, not triangles

– ROW limits

– Utilities

– Structure lines, example: CL of bearing for bridge abutments

– Coordinate call-outs for truncated arcs, vertical and horizontal

Construction Surfaces - Comments

• Send in an RFI on all inconsistencies.

• Visual checks are not adequate. Numerical checks to the 0.01-ft are required.

• Inspectors benefit by taking a high-profile role in checking the surface.

• The project gets built and inspected twice- once in the office and a second time in the field.

• Conflicts/Claims are reduced

Construction Surfaces Contractor Comments

Questions???

3-d modeling implementationremlinedigital.com/mdqi/images/stories/mdqi... · wisdot model concept...

Documents