钻杆后退式分段注浆
retrograde and stepped grouting
钻杆后退式注浆
grouting as drill rod withdraws
启停式分段式冷水机组
on-off segmental chillers system
壁后注浆
Wall-back grouting
pouring mortar into behind underground wall
backfill grouting
grouting on the wall back
Grouting behind Segment
grouting in the back of wall
inject concrete upon the well
backwall grouting
管片壁后注浆
grouting be- hind segment