PAR 1085 – SOUTH SECONDARY IMPROVEMENTS PROJECT

A 4D GIANT

Eric M. WetzelCarollo Engineers, Inc.

Bentley Be Inspired AwardsNovember 13, 2012

• PAR 1085 South Secondary Improvements Project• What is 4D?• Building the 4D Model• 4D Visualization• The Benefits• Summary• Questions

South Secondary Improvements Project

Outline

South Secondary Improvements Project

Metro Wastewater Reclamation District Robert W. Hite Treatment Facility

(The District)

DAF & Centrate Modifications

Ammonia Facility

Stage 5, RAS Pump Stations, Secondary Clarifier Modifications

South Aeration Complex (SAC)

• $136 million w/ potential $1.8 million bonus for early completion

• Meets new wastewater discharge criteria and adds capacity

• Very tight schedule to meet permit compliance

South Secondary Improvements Project

Carollo Engineers’ Role

• Design Engineer & Owner’s Representative during construction

• Review Contractor’s construction schedule to verify compliance with the Contract

• Responsible for 3D and 4D models

What is 4D?

South Secondary Improvements Project

What is 4D?

• 4D is a tool that links a 3D CAD model with a construction schedule

• The resulting 4D model allows visualization of the planned construction sequence

3D Model + Schedule = 4D Visualization

Building the 4D Model

South Secondary Improvements Project

3D Model• Software Used

Bentley Microstation V8 XM Bentley Architecture V8 XM Bentley Structural V8 XM PlantSpace Design Series V8 XM InRoads XM ProjectWise V8i ProjectWise InterPlot Navigator V8i

• 65 Total Models Anything above 2” pipe was modeled

• 99 Reference Files• Completed during the design phase• Finalist – Be Inspired Awards 2011

3D Model Elements

• To achieve a 4D visualization, the 3D model must be designed into constructible elements Construction Joints Pipe Joints

• 3D model must match the depth of the construction schedule

Construction Schedule

• Software: Primavera P6 v7.0

• Extremely detailed consisting of 12,143 activities

Structural Drawings vs. Construction Schedule

Linking the Model and Schedule

• Import accepted Primavera P6 Schedule into Bentley Navigator V8i

• Link activities in Schedule to Item Sets in the Model Drop and Drag

• After Linking is complete: Close Navigator V8i and Open linked

model in Microstation Use Animation Producer in

Microstation to create image frames Set time frame (May ‘11 – June ‘13) Set frame duration (daily, weekly, etc.)

Import frames to Camtasia for .AVI development

Visualizing the Visualization

• While watching the 4D visualization• Every start activity will turn

the item set within the model green

• Every finish activity will turn it to the model color. Yellow in this example

Example: Concrete – Rebar, Form, Pour, Cure

4D Model – South West Blower Building

PAR 1085 South Secondary Improvements Project

The BenefitsHow does this help?

South Secondary Improvements Project

4D Benefits

• Tool for Risk Mitigation• 4D analysis validated Contractor’s realistic ability

to obtain full bonus ($1.8 million)• Detailed review and identification of issues in the

schedule

Example 1: Concrete Pour Sequence Compliance

Schedule Bust: Wall and Slab are poured concurrently. A single bust = Potentially 14 calendar days.Schedule Bust: Wall is being poured prior to Slab

Example 2: Missing Activities/Links or Inappropriate Logic

“A” – Schedule did not reflect updated CJs.

“B” – Threshold of two facilities. Not accounted for in schedule

A

B

Missing Activities/Links

Upon completion of linking the schedule to the model, linked items can be turned off to show only model items not linked to an activity

Example 3: Visual Assessment of Actual vs. Planned

10/2/2012

4D Benefits – Cont.

• An updated 3D model for Owner’s use

• Public Outreach• Identification of non-

conformance with Contract

• Ability to look-ahead and plan for future Work activities

Summary

South Secondary Improvements Project

Summary

• 4D tool mitigated significant risk associated with a complex and accelerated schedule

• Minimize logic loops, missing activities, non-conformance, etc, to account & save significant time in the schedule. Estimated at 60 working days to date

• A tool to engage stakeholders without a tangible connection to the project• An updated 3D model that can be used for facility maintenance or

modifications• Versatile Bentley software was utilized in all facets of 3D and 4D

development No hardware or software costs incurred to produce 4D

Questions?

Eric M. Wetzel, LEED-AP BD+CProject ControlsCarollo Engineers, Inc.390 Interlocken Crescent, Broomfield, CO 80021(303) 286-3047