Prime Horizontal Gallery of Case Histories

CROSSINGS

RIVERS, HARBORS, INFRASTRUCTURE

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Falmouth Harbor Crossing September 2000 500 m under Falmouth Harbor with long, curving track in the horizontal plane to avoid docks. Residences, a seawall, a deep sewer main and a roadway were in very close proximity blocking the exit point.   Brussells Subway November 2001 Crossing under busy city intersection, highway underpass and electrified subway. Many nearby pilings of office buildings and many copper and fiber conduits carrying telephone and electricity. Too dangerous for conventional techniques.   Poldervaart Railway Corridor December 2000 Pipeline in 1 meter corridor for the first 300 meters of the crossing and a large radius right hand curve over the balance to maintain spacing against the railway. The electrical and magnetic interference from electric trains passing every 7 minutes and high voltage power lines feeding City of Rotterdam caused the failure of two previous attempts to drill the pipeline by another contractor.

Paris - River Seine Parallels March 2001 Two 5 meter parallel crossings under the River Seine and under the Electricity de France building at the edge of the river. Very high electrical and magnetic interference prohibited the use of conventional methods.

Teeside Parallel Crossings December 1999 Two parallels under the River Tees near Teeside, England, in the vicinity of a 3 m square tunnel containing oil pipelines with a large radar mast near the exit point, causing a great deal of magnetic interference.

Yerseke Mussells Parallel Crossings October 2000 3 parallel crossings of 1,500 meters passed under a seawall on entry, under 3 harbors, across an 800 meter estuary, through the center of two sport marinas and down the center of the commercial harbor, all at a depth of 35 m.

Hong Kong Suspension Bridge Parallel Crossings May 2001 4 parallel, equally-spaced product lines in designated right-of way under shipping lane and 30 meters offset from suspension bridge. Significant magnetic and AC interference was present. Hilly jungle at beach exit point caused the conventional gyroscopic techniques used for the first 2 parallels to be abandoned.

Tunis Parallel Crossings August 2001 15 horizontal parallels near Tunis with ±1 meter tolerance between bores. Rail lines and infrastructure congestion throughout.