Steel deep foundation piles with concrete poured inside.
Elevator foundation erected on right hand side. New stairway and elevator floor penetration at the top.
Another view of new elevator foundation
Geothermal heating system being installed
Holes are drilled to 300 feet
Clay and silts suck out from boring holes. Artifacts of bones, shoes, and other household materials were found.
Boring view form tower
300 foot long geothermal pipe. Rounded end goes into the ground
Unconnected end stick out of 300 feet deep hole waiting to be connected to the entire system
36 holes will be drilled
System will be pressured test to make sure there is no leak in all 36 pipe.
Water retenion vault mandated by the city of seattle for construction site. When water fill up to 2 feet near asphalt it gets drained into sewage.
Depp pile foundation support grade beam which in turn support new column. New column will pair with original column for greater seismic resistant. New column will (+ sign shape in picture) pierce up to attic level.
Graded beam form installed
Grade beam steel reinforcements passes through pile to transfer loads from new column
Grade beam casted
Three layer of granite shown are currently connected only by weak motar. New holes is drilled and reinforcements are added for shear resistant.
Extracted original granite in preparation for steel reinforcement insertion.
Originalsteel from under Jackson plaza. This is why Jackson plaza needed to be demolished.