Tunnels

Cover of Guide to Road Tunnels Part 4: Retrofitting Tunnels
Guide to Road Tunnels Part 4: Retrofitting Tunnels
  • Publication no: AGRT04-19
  • ISBN: 978-1-925854-35-0
  • Published: 30 July 2019
  • Edition: 1.0

Guide to Road Tunnels Part 4 provides guidance on the retrofitting of existing tunnels, including the need for refurbishment, the types of refurbishment and processes for developing project requirements. Guidance is provided on geometric considerations relating to cross-sections, traffic management functions including signs and lighting, fire and life safety including fire protection and evacuation, mechanical systems including pumps and lifts, electronic systems including power supply and energy efficiency.

The online guide is currently being built.

  • 1          Introduction
    • 1.1       Purpose
    • 1.2       Scope of Part 4
  • 2          General Requirements for Tunnel Retrofitting/Refurbishment
    • 2.1       Introduction
    • 2.2       Providing a Safe System
    • 2.3       Critical Infrastructure Protection
    • 2.4       Risk Analysis
    • 2.5       Traffic Management During Retrofitting/Refurbishment
    • 2.6       Testing and Commissioning
  • 3          Establishing the Need for Refurbishment
    • 3.1       Introduction
    • 3.2       Tunnel Inspections Regime
    • 3.3       Process for Developing Project Requirements
      • 3.3.1      Introduction
      • 3.3.2      Safety File
      • 3.3.3      Overall Process
      • 3.3.4      Developing and Implementing the Concept
      • 3.3.5      Summary
    • 3.4       Types of Refurbishment/Retrofit/Renewal
  • 4          Traffic Capacity Expansion
    • 4.1       General
    • 4.2       Additional Tubes
    • 4.3       Widening Existing Tubes
    • 4.4       Rearranging Lane Configuration
    • 4.5       Geometric Design Considerations
      • 4.5.1      General Requirements
      • 4.5.2      Design Requirements
  • 5          Traffic Management Functions
    • 5.1       Signs and Lighting
      • 5.1.1      Signs
      • 5.1.2      Lighting
    • 5.2       Traffic Management Systems
  • 6          Fire and Life Safety
    • 6.1       Introduction
    • 6.2       Fire Protection
    • 6.3       Evacuation
    • 6.4       Structural Fire Protection
  • 7          Mechanical Engineering Features
    • 7.1       Introduction
    • 7.2       Ventilation Systems
    • 7.3       Other Mechanical Components
      • 7.3.1      General
      • 7.3.2      Pumps and Pumping Stations
      • 7.3.3      Crane and Hoist Systems
      • 7.3.4      Lifts
  • 8          Electrical/Electronic Engineering Features
    • 8.1       Electronic Control Systems
    • 8.2       High Voltage/Low Voltage Power Supply and Distribution Systems
    • 8.3       Other Electrical/Electronic Systems
    • 8.4       Network and Systems Architecture
  • 9          Other Refurbishment and Repairs
    • 9.1       Tunnel Structure
      • 9.1.1      General
      • 9.1.2      Concrete Structural Elements
      • 9.1.3      Water Ingress
      • 9.1.4      Supported Ceilings and Hangers
      • 9.1.5      Unlined Rock Tunnels
    • 9.2       Cladding
    • 9.3       Other Structural Features
    • 9.4       Pavements
  • 10        Drainage
  • 11        Energy Efficiency
    • 11.1    Introduction
    • 11.2    Ventilation
    • 11.3    Lighting
      • 11.3.1    Lighting Equipment
      • 11.3.2    Portal Treatments
      • 11.3.3    Control Equipment
      • 11.3.4    Reflective Properties of Pavement and Walls
    • 11.4    Drainage
    • 11.5    Temperature Regulation
    • 11.6    Environmental Considerations
  • References
  • Appendix A     Case Study 1: M2 Norfolk Twin Tunnels
  • Appendix B     Case Study 2: Refurbishment of the Terrace Tunnel, New Zealand