Delaware Canal 04_web
Delaware Canal 02_web2
Delaware Canal 03_web2
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.


November 2018


Pennsylvania Department of Transportation
400 North Street, Fifth Floor
Harrisburg, PA 17120


AP Construction, Inc.
One Crescent Blvd, Ste 104
Philadelphia, PA 19112
Lee Norelli

Project Leader:

Brian Froehlich, PE


Delaware, PA