Guide for the Preservation of Highway Tunnel Systems (2015) / Chapter Skim
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14 4.1 Definitions of Preservation Actions Drawing on the definitions of preservation actions for bridges in the 2011 FHWA Bridge Preservation Guide,(4) the following definitions of preservation actions for tunnels are provided.
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Highway Tunnel Preservation Actions 15 With the promulgation of the anticipated National Tunnel Inspection Standards (NTIS) , tunnels must be inspected every 2 years unless a risk assessment allows for this period to be extended.
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16 Guide for the Preservation of Highway Tunnel Systems 4.3 Examples of Tunnel Preservation Actions To assist tunnel owners in fully understanding typical preservation actions required for aging tunnel systems, this section summarizes some typical tunnel system conditions that, once identified, an owner needs to address. Consider an agency ("Agency X" used throughout this guide)
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Highway Tunnel Preservation Actions 17 Preservation Action Tunnel # Ventilation upgrade to meet NFPA 502 1 Install new light-emitting diode (LED) lights 1 CO system – repair to operating condition 2 Repair active leak in tunnel 4 Remove existing concrete tunnel ceiling 6 Install flood gates 6 Table 4-2.
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