New Developments in Trenchless Technologies • Wide range of technologies suitable for different installation lengths, diameters, materials, or specific requirements (like accuracy) • Direct Pipe & Intersect drills • Variants on circulation or reaming
New Developments in Trenchless Technologies Trenchless Methods Personnel Entry Not Required Personnel Entry Required Horizontal Earth Pipe Jacking Utility Tunneling Boring Open Face Tunnel Boring New Austrian Hand Road Header Shield Machines Tunneling Method Mining Methods Microtunneling Horizontal Directional Boring Methods Method Drilling Pipe Jacking – Auger Pipe Ramming Directional Microtunneling (Direct Open Face or Boring Method Pipe) Shielded Maxi Midi Mini Track Cradle Type Type Fluid Mechanical Cutting Cutting
New Developments in Trenchless Technologies Direct Pipe – Directional microtunneling machine pushed forward by thrusters at the surface entry site Intersect – Two drill rigs drill from each side. Used for very long drills, or to reduce the annular pressure of the drilling fluid.
New Developments in Trenchless Technologies Variants on reaming the hole – this might be motivated by different reasons, such as minimizing the need to handle fluids at the exit side.
HDD Design Workflow Iterations of Route and Profile Preliminary routing & crossing method selection (based on • desktop assessments of impacts or constructability) Preliminary design (alignment and profile to satisfy installation • and operating requirements) Adjustment based on data from geotechnical, • hydrotechnical or geohazard investigations Landowner requests • Last minute information (utility locates differ from information • available during design) HDD contractor adjusts entry and exit locations or profile • within design tolerances Contingency re-design •
HDD Design Workflow Iterations of Route and Profile 24” Natural gas pipeline crossing meandering river with seasonal flooding
HDD Design Workflow Iterations of Route and Profile 24” Natural gas pipeline crossing meandering river with seasonal flooding. Blue is the final alignment.
HDD Design Workflow Iterations of Route and Profile 12” Natural gas pipeline crossing wetland and river. Client proposed crossing with a horizontal curve which was too tight for the pipe stress
HDD Design Workflow Iterations of Route and Profile 12” Natural gas pipeline crossing wetland and river.
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