| 摘要 |
PURPOSE: A rockfall preventive tunnel structure is provided to prevent the accident caused by the fall of rock or soil on traveling cars, to cut down the cost required for repair or maintenance of a road or a railroad, and to improve the safety for vehicles traveling through a tunnel. CONSTITUTION: The rockfall preventive tunnel structure contains a protector(10) for the entrance of a tunnel projected to the appointed length to one side of the exit or the entrance of a tunnel(1). The protector(10) for the entrance of a tunnel comprises: a metal frame member(20) placed to the front of the exit or the entrance of the tunnel(1) to make both ends located on the outer side of a road or a railroad; a bearing member(30) whose lower part is fixed to the outer ground of a road or a railroad and upper part supports both ends of the metal frame member(20); an outer cover panel(40) covering up the outer side of the metal frame member(20) not to make rock or soil fall down to the exit or the entrance of the tunnel(1); and an inner cover panel(50) covering up the inside of the metal frame member(20).
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