By Federal Highway Administration, Federal Transit Administraion, S Department of Transportation U
This 2004 handbook is an replace to the model issued in may perhaps, 2003. It offers particular info for the upkeep and rehabilitation of either road and rail transit tunnels. even if a number of parts are comparable in either forms of tunnels, a couple of parts are particular to both street or rail transits tunnels, and are outlined consequently.
Content:
entrance subject
• record of Tables
• record of Figures
• desk of Contents
1. creation
2. Tunnel development and platforms
three. Preventive upkeep
four. Rehabilitation of Structural parts
Appendix A: Life-Cycle expense technique
• thesaurus
• References
Read or Download Highway and Rail Transit Tunnel Maintenance and Rehabilitation Manual PDF
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Extra resources for Highway and Rail Transit Tunnel Maintenance and Rehabilitation Manual
Sample text
Road salts carried by vehicles into highway tunnels, along with the presence of infiltrated water, can increase deterioration of the structure, especially the invert. Rate of corrosion for tunnel components of rail transit tunnels can be increased by the presence of stray current from electrified traction power systems. 1 – Ice formation at location of water infiltration in plenum area above ceiling slab. 3. Remediation Methods In general, there are three options that a tunnel owner must consider for remediation of a water infiltration problem.
In fact, the tasks of inspection and preventive maintenance may often overlap in order to make efficient use of the inspection and maintenance staff and equipment. This does not detract from the importance of proper documentation of the inspection process; it just allows for certain simple procedures to be performed immediately after the condition is discovered. This serves as a means of preventing any further degradation that could occur before a scheduled maintenance is performed. If items are going to be repaired or replaced, it is important that some internal guidelines be followed to ensure accuracy and consistency of repairs or new installations.
Any testing of the cathodic protection effectiveness shall be performed in accordance with the National Association of Corrosion Engineers (NACE) Internationals’ recommended practices and procedures. Also, ensure that any test equipment is in good operating condition and that the calibration effective period has not expired. Perform electrical measurements (voltage and current) and inspection of a cathodic protection system annually. The electrical measurements and inspection will be performed to: • • • • • • • • Make certain that protection is being provided in accordance with established criteria in the design documents.