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Malcolm Drilling prepares to drill secant pile drilled shafts for SR 99 TBM launch pit.

Launch Pit Retaining Walls Completed for SR 99 Tunnel in Seattle

August 6, 2012 rockman Comments Off

Drilled shafts have been installed by Malcolm Drilling to form the secant pile retaining walls to support the 400 ft x 80 ft x 80 ft launch pit for the SR 99 tunnel boring machine […]

Malcolm drilling crews setting up to drill secant pile shafts for TBM launch pit

Digging deep to drill Highway 99 tunnel

April 29, 2012 rockman Comments Off

Construction has started on the tunnel boring machine launch pit for the WSDOT SR 99 Tunnel Project (Viaduct Replacement). The 420 foot long pit is being constructed using secant pile retaining walls, with 2 rows […]