隔壁を有するトンネル二次覆工への高流動コンクリートの適用

関西電力舞鶴発電所新設工事のうち取水路トンネル工事

抄録

The intake tunnel has a unique cross-sectional shape, with a wall provided at the center. In addition, the amount of reinforcing bars per unit volume of concrete is larger than normal tunnels. Since a sliding form was used for casting the secondary concrete lining, self-compacting concrete was adopted to prevent defects such as voids due to insufficient compaction, and to facilitate concrete placement. Therefore, placement tests were performed in advance, to determine quality control criteria with which to rationalize the construction.
This paper covers the outline of the placement tests performed prior to the tunnel construction; methods used to determine the quality control criteria; and results obtained during the construction