New Developments in Trenchless Technologies Wide range of - - PowerPoint PPT Presentation

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

Trenchless Methods

Horizontal Earth Boring Pipe Jacking Utility Tunneling Open Face Shield Hand Mining Tunnel Boring Machines Road Header Methods New Austrian Tunneling Method Auger Boring Boring Methods Microtunneling Method Horizontal Directional Drilling Track Type Cradle Type Maxi Mini Midi Personnel Entry Not Required Personnel Entry Required Fluid Cutting Mechanical Cutting Directional Microtunneling (Direct Pipe) Pipe Ramming Method Pipe Jacking – Open Face or Shielded

New Developments in Trenchless Technologies

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.