PROVIDING TRAIN VIBRATION ISOLATION TO A HOSPITAL: A CASE STUDY

When transit expansion has to accommodate a hospital's expansion plans, the issue of vibration suppression becomes critical. MARTA's (the Metropolitan Atlanta Rapid Transit Authority's) North Line extension encountered just such a problem. Approximately 1,100 feet of trackway passes through property owned by Northside Hospital. The hospitasl's long-range expansion plans call for doctors' buildings to be constructed adjacent to and over the new trackway. These criteria caused the trackway section to be designed as a subway and, secondly, incorporate sufficient vibration suppression so that the maximum vibration level allowable during construction and/or train operation could not exceed 75 dB at 8 Hz for ten seconds per day. Their bid price was finally determined by assuming that twelve per day could be set. Early in the project it became evident that, in order to meet the project schedule, more than twelve slabs per day would have to be set. To accomplish this task, MARTA's General Engineering Consultant, Parsons Brinckerhoff/Tudor, and Ruby-Collins, Inc., combined good planning with some ingenious construction methods to turn hat could have been a very time-consuming, difficult job into a very efficient operation. The slides that accompany this presentation illustrate how an estimated setting quantity of 12 slabs per day can, in reality, approach 40 slabs per day.

• Corporate Authors:

  American Public Transportation Association

  1201 New York Avenue, NW
  Washington, DC    20005
• Authors:
  • Walker, W D
• Conference:
  • Proceedings of the 1996 Rapid Transit Conference of the American Public Transit Association
  • Location: Atlanta, Georgia
  • Date: 1996-6-2 to 1996-6-6
• Publication Date: 1996

Language

• English

Media Info

• Features: Figures;
• Pagination: p. 178-183

Subject/Index Terms

• TRT Terms: Concrete slab track; Public transit; Track laying; Transit vehicle operations; Vibration tests
• Identifier Terms: Metropolitan Atlanta Rapid Transit Authority
• Subject Areas: Public Transportation; Railroads; Vehicles and Equipment;

Filing Info

• Accession Number: 00750094
• Record Type: Publication
• Report/Paper Numbers: Volume 3
• Files: TRIS
• Created Date: Jun 3 1998 12:00AM