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Tunnel Inspections and National Standards

Tunnel Inspections and National Standards. Tunnel Inspections. No formal tunnel inspections were performed to the ceiling system (January 2003 – July 2006) Postaccident inspection revealed displaced anchors. Tunnel Inspections. Tunnel Inspections.

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Tunnel Inspections and National Standards

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  1. Tunnel Inspections and National Standards

  2. Tunnel Inspections • No formal tunnel inspections were performed to the ceiling system (January 2003 – July 2006) • Postaccident inspection revealed displaced anchors

  3. Tunnel Inspections

  4. Tunnel Inspections • Inspection Manual for Tunnels and Boat Structures November 2003 • Inspection manual not used • Develop database • FHWA review of the manual • MTA training • Tunnel inspections conducted since the accident

  5. Existing Guidance • 5 years for new tunnels and 2 years for older tunnels • National Bridge Inspection Program • Not to exceed 2 years

  6. Tunnel Inspections • New tunnels are not immune to critical deficiencies • Had MTA inspected the suspended ceiling between November 2003 and July 2006, the anchor creep would likely have been detected

  7. Tunnel Finishes Standards • Surveyed 9 tunnel authorities • Ceiling panel dimensions and weights • Anchorage systems used

  8. Survey Results • Adhesive anchors seldom used to support ceiling panels • Rarely installed in pure tension • Typically support lightweight panels • Mechanical anchors commonly used

  9. Existing Standards • Manual contains no standards on design of tunnel finishes • National standards should be developed

  10. Summary • FHWA lacks legislative authority • Seek legislation authorizing a mandatory tunnel inspection program • Identify critical inspection elements and inspection frequency • Tunnel design manual ensures uniformity and safety

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