Design/Build

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Summary

    The Design/Build with an Engineering Firm approach is a project delivery method for underground construction that integrates design and construction services under a single contract, with an engineering firm either leading or playing a key role in the project team.

    The approach is particularly valuable for underground construction projects where specialized technical expertise is critical to project success and risk management.

Key Characteristics

  • Single point of responsibility for both design and construction.
  • Engineering firm provides specialized technical expertise.
  • Overlapping design and construction phases.
  • Collaborative approach between engineers and contractors.
  • Owner contracts with a single entity.

    • Project Structure Options

  • Engineering Firm as Prime Contractor: The engineering firm holds the main contract and subcontracts construction.
  • Joint Venture: Engineering firm partners with construction contractor as equal entities.
  • Engineering Firm as Specialized Consultant: Construction contractor leads with the engineering firm as a key team member.

    • Process Flow

  • Owner Requirements Definition: Owner establishes project goals, requirements, and performance specifications
  • Team Selection: Selection based on qualifications, experience, and proposed approach.
  • Preliminary Design: Development of concept designs and approach.
  • Progressive Design Development: Continued refinement alongside early construction activities.
  • Construction with Ongoing Design Support: Engineers remain involved throughout construction.
  • Commissioning and Project Closeout: Engineering firm typically leads validation of performance.

    • Challenges

  • More complex contractual relationships.
  • Requires clear definition of roles and responsibilities.
  • Can limit owner involvement in detailed design decisions.
  • Risk allocation requires careful consideration.
  • Quality control processes need clear definition.

    • Applications

  • Complex underground structures requiring specialized engineering.
  • Projects with significant geotechnical challenges.
  • Tunnels with complex systems integration
  • Underground facilities where performance specifications are critical
  • Projects benefiting from innovative technical approaches