山岳トンネル(8)

1:40 PM - 1:50 PM JST(4:40 AM - 4:50 AM UTC)

[VI-1281] Report on adjacent construction of Otaru City waterworks facilities directly under the river in a small soil-covered area

*Yota Hikichi¹ (1. tokyu construction)

Keywords:

tunnnel,small soil-covered area,under the river,Close construction,Suppression of ground surface subsidence,Excavation support method