1.0.1 These Specifications are intended to serve as the technical standard for maintenance ofhighway tunnels.
1.0.2These Specifications apply to the maintenance of mountain highway tunnels constructedwith the drill-and-blast tunneling method.
1.0.3The scope of maintenance of highway tunnels shall include the tunnel structure, mechanicaland electrical(E&M)systems as weil as other facilities.
1.0.4 Highway tunnel maintenance shall follow the,guiding principle of “ Prevention First,Integrated Approach to Prevention and Treatment” which emphasizes preventive maintenance toensure highway tunnels remain in normal working conditions.
1.0.5Higbway tunnel maintenance shall be classified into different maintenance classes andmaintenancé w¶rk to be implemented according to the maintenance grading.
2Terms and Symbols
2.1 Terms
2.1.1 Highway tunnel maintenance
It includes daily patrol,cleaning,inspection,and assessment,maintenance,and repair work tobest ensure the tunnel structure , mechanical & electrical systems, and other facilities are in workingorder.
2.1.2 Maintenance class
Highway tunnels are divided into several maintenance classes based on highway classification,traffic volume, tunnel size, fechnical conditions, geological and climate conditions, and otherfactors for implementing themaintenance standards and maintenance frequencies.
2.1.3 Tunel structure
This includesthe various civil engineering structures, the side and front slopes at the tunnel portals ,tunnel frames, linings, pavements, waterproofing and drainage facilities, inclined( vertical )shafts , maintenance paths and ducts as well as other structural elements.
3Maintenance Class and Technical Condition
3.1 Maintenance class
3.1.1 Highway tunnel maintenance can be classified into the following three classes as perTable 3. 1. 1-1 and Table 3. 1. 1-2. in line with the highway classification system and its tunnel length andtraffic volume.
Table 3.1.1-1Schedule of classilication of tunnel maintenance classes for expressway, Class-1 highway
1General Provisions 2 Terms and Symbols 2.1 Terms 2.2 Symbols 3Maintenance Class and TechnicalConditiom Assessment 3.1 Maintenance class 3.2 Technical condition assessment 4 Tunnel Structure 4.1 General provisions 4.2 Daily patrol 4.3Cleaning 4.4Structural inspection Technic¡l éondition assessment of tunnel structure4.5Maintenance and repair Structural degradation treatment 5M&E equipment 7Safety Management 7.1 General provisions 7.2 Safety management of maintenance 7.3 Safety management of emergency 8 Technical Management Appendix A Tunnel Structural Inspection ReeordForm Appendix BTechnical Condition Assessment $tandard of Tunnel Structure AppendixCTechnical Condition Assessment and Inspection Record ofM& E Equipment Appendix D Technical Condition Assessment of Other FacilitiesWording Explanation fop the Specifications
