| 摘要 |
<p>PURPOSE:To properly dismantle a tunnel which has becomes unnecesary. CONSTITUTION:The outside of a tunnel 50 is surrounded by an outer shell 2. The non-reburied part 55 and the reburied part 57 of the tunnel 50 are shielded by a tail partitioning wall 9 inside the outer shell 2. The bank 60 on the outside of the trunnel 50 is excavated by an excavating machine 7, and the outer shell 2 is advanced. Inside the outer shell 2, a hole 52b is drilled at the secondary covering 52 by a core cutter 19. A joint bolt between the segment pieces 51a and 51a is cut by the brasive jet, etc., through the hole 52b. The secondary covering 52 and the segment piece 51a are withdrawn integrally by a segment holding breaking device 20. The tail partitioning wall 9 is advanced to the non reburied part 55, charging the reburied part 57 with the muddy water. The muddy water filling the reburied part 57 is substituted by a burying material 56.</p> |
