The exchange of urban elevated rail track under th -

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The exchange of urban elevated rail track under the foundation pattern

The backbone of passenger transport system, large capacity, must have safe, reliable performance. So. Should choose the technology is mature and reliable type of elevated track bed. 2.2.1 The technology is mature and reliable ballast track bed is the oldest track bed type, but also the most widely used. In recent years, ballast track bed at home and abroad have conducted in-depth study and to perfect, making this type of technology is mature track bed, and wide applicability, the price is cheap. Solid bed is also increasingly widely used, the type variety, developed rapidly, technology is more mature. Application, for those who have not yet used in the local type, a test section of the best do first, the accumulation of experience and gain a lot of experimental data and then laying Ballastless beam used for system capacity in foreign countries are relatively small line and domestic ground rail are also laying, but the controversy relatively large, the conservation department of widespread opposition. Therefore, in the selection of such a rail foundation should be cautious,[link widoczny dla zalogowanych], if necessary, do first test section. 2.2.2 _L conditions applied ballastless solid bed and beam construction method of the main difference is not the same. Construction of overall top-down track bed. Ranked first for the track, track bed and then pouring concrete, construction, easy to guarantee accuracy. Ballastless girder from the bottom, all the errors accumulated in the track bed top. Therefore, very stringent construction requirements, construction costs are high, a large amount rework 2.2.3 Maintenance of Urban Rail Transit are mainly for passenger transportation, safety and comfort requirements of high, so the horizontal direction, gauge, triangle pits, crawling, drainage, also have higher requirements to ensure that the elevated track bed in good condition. The conservation of ballast track bed a larger workload, and need a larger space for conservation work, now mainly rely on manual maintenance of domestic,[link widoczny dla zalogowanych], foreign countries have to spend on maintenance and repair mechanical equipment. Mechanical maintenance is used when the ballast track bed of a problem to be solved. No ballast track bed of a small amount of maintenance, conservation work is simple, therefore less maintenance and repair of Ding Yuan. Once the ballast track bed without a problem, maintenance will be very difficult. Especially ballastless beam, the choice of 2.3 should be particularly cautious economic cost of civil 2.3.1 the cost of ballast track bed ballast track bed lower than the overall cost of the civil above the track bed ballast-free beam, beam construction without ballast higher than the overall cost of road bed. However. Analysis of elevated track bed in the civil construction cost,[link widoczny dla zalogowanych], the cost of the bridge should be combined with comprehensive comparison. 2.2 operating costs operating costs is the cost of maintenance and repair of maintenance of ballast track bed maintenance costs higher than the conservation of ballast track bed maintenance of Railway Institute 64 on May 16 Cao Ge 2.4 reality each has elevated rail transit system their own characteristics, such as the schedule requirements,[link widoczny dla zalogowanych], schedule,[link widoczny dla zalogowanych], who work level, experience in construction, facilities: r machinery, investment capabilities. Elevated track bed in the choice of crossing type should be sufficient to consider these actual conditions. 3 Conclusion urban elevated rail traffic in China is still in the planning stage although the foreign examples, but conditions vary widely, not simply used by it; ground rail can learn from the experience though, but must be combined with local conditions. Urban elevated rail transit construction and long-term project, track and bridge structure under the same basis. Is a basic project, must be absolutely reliable. Therefore, choosing the right foundation under the elevated tracks because of cable should be considered Ogata. The cities of elevated rail traffic in the implementation of extensive exchange of experience should be, common to fill the gap if the elevated line in the first do some tests, to obtain the measured data, lessons learned, by extension, other post-bound construction system has a good guide. In this paper, the preparation process, has been Wangyuan Xiang, Ye Dade, Zhou Bao and other comrades to help in this would like to express thanks.

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