New PDF release: Highway and Rail Transit Tunnel Maintenance and

By Federal Highway Administration, Federal Transit Administraion, S Department of Transportation U

ISBN-10: 0939773678

ISBN-13: 9780939773671

ISBN-10: 1615833005

ISBN-13: 9781615833009

This 2004 guide is an replace to the model issued in could, 2003. It presents particular details for the upkeep and rehabilitation of either road and rail transit tunnels. even though numerous parts are related in either forms of tunnels, a couple of parts are particular to both street or rail transits tunnels, and are outlined therefore.
Content:
entrance topic
• checklist of Tables
• checklist of Figures
• desk of Contents
1. advent
2. Tunnel building and platforms
three. Preventive upkeep
four. Rehabilitation of Structural parts
Appendix A: Life-Cycle rate technique
• word list
• References

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Additional resources for Highway and Rail Transit Tunnel Maintenance and Rehabilitation Manual

Example text

The two most common uses of axial fans are to mount them horizontally on the tunnel ceiling at given intervals along the tunnel or to mount them vertically within a ventilation shaft that exits to the surface. 17 – Axial Fans (2) Centrifugal This type of fan outlets the air in a direction that is 90 degrees to the direction at which air is obtained. Air enters parallel to the shaft of the blades and exits perpendicular to that. For tunnel applications, centrifugal fans can either be backward-curved or airfoil-bladed.

A) Rail Lubrication It is commonly known that periodic lubrication of curves can extend rail life. The lubricant should be placed on the gage face of the rail, with care taken to minimize the amount of lubricant to prevent migration to the top of the rail head. The application can be performed by hand, by the use of wayside lubricators (a train actuated device that first applies the lubricant to the wheel flanges and then subsequently to the rail), or by railcar-mounted lubricant sticks that apply a thin coat of grease to the gage face during train operation.

The spray method can be used so that the integrity of the joint is not disturbed. f) Regaging As gage deficiencies are identified during inspection, regaging should be performed if changes in gage are severe or abrupt. g) General Aligning Independent of whether the track structure is direct fixation or ballasted construction, the general vertical and horizontal alignment should be periodically adjusted to conform to specified standards. This can be accomplished by using automatic track aligning equipment for ballasted track or by manually raising and lining direct fixation track and placing shims under the rail plates as necessary.

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Highway and Rail Transit Tunnel Maintenance and Rehabilitation Manual by Federal Highway Administration, Federal Transit Administraion, S Department of Transportation U


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