| 摘要 |
PURPOSE:To prevent the occurrence of impact caused by pressure rise when high-speed vehicles pass by a method in which a shield wall surrounding the passing space of vehicle and having air vents is provided in tunnel and an air escape space is formed between the shield wall and the inner surface of the tunnel. CONSTITUTION:A single or double or more shield wall 4 surrounding the passing space 5 of vehicles 3 and having many air vents 7 is provided in a tunnel 1 and air escape spaces 6 are formed between the shield wall 4 and the inner surface of the tunnel 1. Check valves are set in the vents 7 as needed. When high-speed vehicles 3 pass through the tunnel 1 or when vehicles 3 pass by each other in the tunnel 1, air of raised pressures is allowed to escape through the vents 7 to the spaces 6, thereby preventing the overmuch rise of pressures and weakening impact to be occurred. |
