Hood for reduction of micro-pressure waves at the Railway Tunnel
SUMMARY
World-class railway tunnel hood technology for deduction of micro-pressure wave
Entrance of a high-speed train into the tunnel causes a pressure wave to be generated and travel propagates towards the end of the tunnel.
Some of the pressure waves travels out from the tunnel, and it is called a micro-pressure wave. The wave creates explosion sound, environmental noise, along low-frequency vibration in the residential area around the tunnel.
BUILT-UP BEAM beyond a limitation of SPAN with Innovative Technology
BUILT-UP BEAM beyond a limitation of SPAN with innovative technology is an economic and cutting-edge structural system that is able to create extra-large spaces.
Components of Hood
Distinction between prior and present technologies
Features and Advantages of the BUILT-UP BEAM
Structural Performance
Use of Curved Steel Plate
Reinforce its resistance to buckling.
Use of Steel Plate with Bumps in Upper and Lower Parts
Reinforce stiffness against bending.
Use of Round Bar for Corner Part Capability Enhancement
Reinforce its cross section’s capability.
Use of Automatic Welding Machine
Place a stiffener on the inside unconstrainedly.
Quality and Constructability
Production Possibility of Product with High Precision
Easy to assure quality and enhance constructability.
Using Steel Plates of Various Thicknesses
Available to produce the optimized cross section.
Design and Economics
Beautiful Exterior by Use of Curves
Reduce the quantity of structural steel by about 20% compared to general steel (H-section steel) due to use of capability-strengthening cross sections.
Mass Production
Save construction expenses and improve constructability.
Composition of Structural Steel’s Cross Section
Capability Enhancement ROUND BAR
Curved Surface / Side Surface Structural BAR
Stiffener for Structure Enhancement
Uneven Structural Steel Plate