MIRROR REINFORCEMENT MATERIAL, MIRROR REINFORCEMENT STRUCTURE, AND CONSTRUCTION METHOD THEREOF

• Main Authors: MATSUO TSUTOMU, IMOTO ATSUSHI, OKABE TADASHI
• Format: Patent
• Language: English; Japanese
• Published: 06.10.2016
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MINING; SHAFTS; TUNNELS

PROBLEM TO BE SOLVED: To provide a mirror reinforcement structure for appropriately fixing a mirror reinforcing material with a natural ground in a surrounding in a mirror reinforcement work, enabling tunnel excavation while stabilizing the natural ground in the surroundings, and reducing a load on timbering while tunnel excavation after the reinforcement and eliminating reinforcement of the timbering.SOLUTION: A long mirror reinforcement material 1 is installed in a natural ground 101 ahead of a mirror surface 102, and includes a first weak restraining part 2 disposed near the mirror surface 102, and a tight restraining part 3 and a second weak restraining part 4 that are disposed alternately in front of the first weak restraining part 2 in a forward direction. The tight restraining part 3 is provided at three or more locations. The tight restraining part 3 is shorter than either the first weak restraining part 2 or the second weak restraining part 4, and exerts greater restraining force on the natural ground 101 in the surroundings than either the first weak restraining part 2 or the second weak restraining part 4.SELECTED DRAWING: Figure 1 【課題】鏡補強工で鏡補強材と周囲の地山を適切に定着させ、周辺地山を安定させた状態でトンネル掘進を行うことを可能にすると共に、補強後のトンネル掘進時に支保にかかる負荷を小さくし、支保の補強を不要にすることができる鏡補強構造を提供する。【解決手段】鏡面１０２から前方の地山１０１に打設される長尺の鏡補強材１であって、鏡面１０２の近傍に配置される第１の弱拘束部２と、第１の弱拘束部２の前側に前方に向かって強弱の順で交互に配置される強拘束部３及び第２の弱拘束部４とを備え、強拘束部３を３カ所以上備えており、強拘束部３が、第１の弱拘束部２と第２の弱拘束部４のいずれよりも短尺で形成されていると共に、第１の弱拘束部２と第２の弱拘束部４のいずれよりも周囲の地山１０１への拘束力が大きくなるように形成されている。【選択図】図１