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Crossing Structure Recommendations for At-Grade Rail Crossings of U.S. Routes 29 and 15 in Prince William County, Virginia.
| 题名： | Crossing Structure Recommendations for At-Grade Rail Crossings of U.S. Routes 29 and 15 in Prince William County, Virginia. |
| 作者： | diefenderfer, b. k. |
| 关键词： | rail lines,surfaces,highways,crossings,at-grade rail croasing |
| 摘要： | The intersection of a rail line and a roadway at an at-grade crossing represents the meeting of two vastly different transportation modes. Although they may share a common crossing where they intersect, the typical structural design of the supporting foundation for each is quite different. The design of a roadway consists of multiple layers of low-permeability materials, whereas the design of a rail line includes rails and crossties supported by open-draining aggregate ballast. Because of the use of highly permeable materials, the open draining nature of a rail line substructure can cause the early deterioration of a nearby roadway unless steps are taken to provide adequate drainage. In addition to structural differences, the rail line is designed to accommodate a substantial vertical deflection from passing loaded rail cars; it is common for a rail line to undergo up to 0.3 inch of vertical displacement. This large deflection can result in a greatly reduced service life for nearby pavements because of fatigue failure. Although it is inevitable that a rail crossing structure will have to undergo periodic reconstruction, selection of an optimum crossing surface constructed over an adequately prepared foundation will greatly increase the service life of the crossing. An optimum crossing structure can be viewed as one that combines safety, cost-effectiveness, long service life (reducing user costs by increasing the time between successive replacements), good performance, and ease of maintenance. This report discusses the advantages and disadvantages of several crossing types that are the most appropriate for the conditions expected at the U.S. Route 29 and U.S. Route 15 crossings in Prince William County, Virginia. Specific recommendations for each crossing type are provided. / NOTE:Final rept. (Mar-Oct 2004). |
| 报告类型： | 科技报告 |
相关文献
- Crossing Structure Recommendations for At-Grade Rail Crossings of U.S. Routes 29 and 15 in Prince William County, Virginia. Final rept. (Mar-Oct 2004).
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