The Full Power of 3D Subsurface Design Saves Money for Owners and Contractors

Presented by: Kristi Shinall, Parsons; Jennifer Hall, P.E., Parsons;Kimo Pickering, Kiewit

Contributor: T. Patrick Cowley, P.E., Traffic Operations Engineer,Utah Department Of Transportation, Region Two

July 20, 2015Boise, ID

Why is 3D design important?

Top five causes of construction delays(1):1. Unforeseen utilities2. Differing site conditions3. Permitting4. Weather5. Errors in plans and specifications

2(1) Avoiding Delays During the Construction Phase of Highway Projects, NCHRP 20-24(12)

Common Practice

A utility is considered to be in 3D by assigning an elevation.

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Typicaldepth

Storm drain

Water line

Ductbank

Project Example

SR-114 Geneva Road Widening Project in Utah County3D Modeling used: Partially

Post Project Take Aways:Utility Issues: 8Approximate Cost: $390,000

3D Full Power:Number of conflicts: 4Approximate Cost savings: $240,000

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Can we do better?

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The short answer is YES!!!Let’s start with workflows.

How is this accomplished?

1. Early Identification:– SUE– Pothole and Survey

2. Design software:– AutoCAD Civil 3D– MicroStation with InRoads

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Example: Locating conflicts using Clash Detection

Hard clash

Soft clash7

Fiber withunderdrain

Water with duct bank

Duct bank with underdrain

Best Practices

**UDOT has a philosophy of early and often. Each project is evaluated to determine if it is advantageous to complete SUE prior to starting design. A direct result of this philosophy is the implementation of a Best Management Practice where SUE is provided upfront for Design-Build projects.

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3D modeling integrates the work of all disciplines so no one discipline is designing in a vacuum

3D models can be linked directly to construction schedules to help visualize construction sequencing

Minimize risk, improve accuracy of quantities and optimize design

Take Aways

1. Assess feasibility of 3D Modeling2. Implement a plan of action3. Coordinate, Cooperate, and Communicate(2)

4. Partnership between Designers, Contractors, and Owners

9(2) NHI 134006 Utility Coordination for Highway Projects; Three “C” Effort

Questions

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Thank You!