Falls Township, PA
CSX Railroad Pedestrian Tunnel
Turn-Key Tunneling, Inc was subcontracted for this Pennsylvania Department of Transportation project featuring a 12' dia tunnel installation using a hydraulic driven tunnel shield.
Special conditions: Constructed under an active Conrail track with unstable soil. Project required ground pretreatment prior to tunneling to ensure minimum subsidence beneath the active railway.
Turn-Key employed JennChem stabilizer to meet the contract requirements on the pretreatment using 250 injection rods to solidify the loose fill above the tunnel limits. The project consisted of a 140-lf drive of 144' dia tunnel.
Further unforeseen issues included boulders and specialty backstop design/built to support initial jacking load of 960,000 lbs to launch the shield.