| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a flexible, simple and economical junction structure of a vertical shaft mouth part, capable of securing the safety of a structure when external force acts and surely preventing the decline of a water cutoff performance. <P>SOLUTION: Planer cutoff rubber 21 is provided along the end face 6 of a tunnel 5. Along the surface 12 on the inner side of a vertical shaft 3 of the cutoff rubber 21, a cutoff steel plate 17 which comprises an outer side ring 17b and an inner side ring 17a and has a cutoff weld part 19 to function as a deformation induction part at a boundary is provided. The cutoff steel plate 17 and the cutoff rubber 21 are fixed to the mouth part of the vertical shaft 3 using a headed bolt 29 and are fixed to the end face 6 of the tunnel 5 using a headed bolt 23. Between the head part 30 of the headed bolt 23 and the cutoff steel plate 17, an elastic washer 27 is provided. A rib plate 33 is provided on the surface 14 on the inner side of the vertical shaft 3 of the cutoff steel plate 17. The contact part of the rib plate 33 with the outer side ring 17b is fixed over the entire length, and the contact part with the inner side ring 17a is fixed only at a predetermined part. <P>COPYRIGHT: (C)2012,JPO&INPIT |
