Development of New Tunnel Entrance Hoods

Tunnel micro-pressure waves can be reduced by using structures known as tunnel entrance hoods which ease the pressure gradient of the compression wave that high-speed trains generate when entering a tunnel. They need to be extended with train speed increases as the effect of tunnel entrance hoods depends on their length. The authors will explain the development of technologies to shorten the required extension and reduce construction costs and thus cut total construction costs for installing tunnel entrance hoods in this report. A tunnel entrance hood with ducts is the technology developed to shorten the required extension. The authors confirmed the effect of easing the compression wave pressure gradient and the control mechanism of compression waves in model tests and on-site tests. The technology to reduce construction costs is using large, light and highly durable panels in lightweight panel tunnel entrance hoods. This technology was developed with the aim of reducing tunnel entrance hood construction costs and of the main structural members that account for a large percentage of total costs.


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  • Accession Number: 01337681
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 19 2011 3:18PM