| 摘要 |
PROBLEM TO BE SOLVED: To protect workers found between a tunnel excavator and a succeeding truck or inside the succeeding truck from a falling substance by providing a falling substance blocking plate attached with a door between the excavator and the truck. SOLUTION: Regarding a tunnel excavator 1, which has a succeeding truck connected to its rear and excavates an inclined shaft with a stooping-down roof, falling substance blocking plates 22, 23 of two steps are provided above respective traction beams 20 one in front and one in rear. The respective falling substance blocking plates 22, 23 are arranged so that they may be horizontal while the inclined shaft is excavated and may cover almost the whole horizontal plane in the space above the traction beam 20. The falling substance blocking plate 22, which is made in a shape of cutting one of its elliptical plate end in a straight line and having this end (front end) pivoted to the traction beam 20, has an opening in almost a rectangular shape formed on the center of its front end and the rear end, and the opening on the rear end is provided with a double-leafed hinged door so as to cover the opening. The workers normally work behind (below) the falling substance blocking plates 22, 23. |
