METHOD FOR FORMING A PILLAR PART AND REINFORCING ADJACENTLY CONSTRUCTED PARALLEL TUNNELS WITH REINFORCING RODS

摘要

A method for forming pillar parts and reinforcing adjacent tunnels comprising deepening an earlier excavated part of a first tunnel while maintaining the preset distance to a second tunnel; making bores in the pillar part, mounting stiffening members in the pillar, and grouting of the pillar part and a reinforcing stiffening member exposed during excavation of the second tunnel, wherein a plurality of stiffening members on the side surface of the first tunnel where the pillar part between the second tunnel and the first tunnel will be formed pass through the non-unearthed part on the side of the first tunnel and then through the pillar; placement of spread concrete for reinforcement of the unearthed surface that comprises a plate structure of the stiffening member exposed during excavation of the second tunnel; fastening of the support plate to the stiffening member and fixing them with a nut; placement of spread concrete for reinforcement of the unearthed surface that comprises a plate structure of the stiffening member exposed during excavation of the portion that remained unexcavated on the side of the first end pillar, fastening the support plate to the stiffening member and fixing them with a nut.