CT UNDERGROUND

OVERVIEW

CT Underground has been providing tunneling solutions to client in Alberta and across Western Canada for over three decades.

Our tunneling services are used to install pipeline and casing in applications that involve short crossing distances, precise grade and a wide range of diameters (including extremely large diameter culverts). We provide a non-disruptive alternative where excavation is not an option. This includes highways, rail lines, pedestrian pathways, pipeline crossings, rivers and more.

CT Underground’s tunneling solutions can be used to safely overcome common construction challenges such as ground water and rugged or unstable soil structures. Many methods are available for workspaces with limited access.

The team at CT Underground is committed to your success, and will advise you on the tunneling solution that is right for your project.

The Right Trenchless Service for your Application

Horizontal Auger Boring:
A highly flexible method with many applications – from boring through solid rock to clearing debris from existing lines.

Horizontal augering equipment can install steel casings up to 1.8 m diameter. A small boring unit can be used for tunneling through rock formations exceeding 610 mm, while the auger clears the debris. Augers also are useful in cleaning out blockages in installed pipes.

Guided Boring:
A proven solution for installations where accurate line and grade is vital to your success, such as water and sewage lines. Ideal in displaceable soil, a Guided Boring Machine can install pipe up to 3.6 m diameter and between 50 m to 150 m in length.

A launch and reception shaft is placed on each side of the crossing. Next, a pilot tube pushed through the ground at specified grade and alignment. A reaming head is attached to the pilot tube to install casing. Often guided boring is done in tandem with auger boring or pipe ramming.

Tunnel Boring/ Pipe Jacking:
Whether it is in hard rock or sand, these hydraulic systems allow pipe to be installed with precise grade and line. Tunnel Boring and Pipe Jacking are low-disturbance systems that employ hydraulics to install underground pipelines with a minimal risk of settling or sloughing. They can be used to create tunnel diameters between 1m and 15 m.

Operators have the choice of various cutter heads and sand shelves. A closed-face attachment can be used in unstable ground conditions. This versatile system can be easily adapted to work with any jacking pipe, in any pipe joint length.

Pneumatic Pipe Ramming:
Steel casing is driven through cobble, gravel and sandy soils at the required angle by a pneumatic hammer: from horizontal to vertical. The material is cleaned out of the pipe using an auger boring machine. It can be used for pipe diameters ranging from 305 mm to 3.6 m.

Down The Hole Hammer:
A pneumatic hammer pulverizes cobble, boulders and rock formations into small debris, which is removed by an auger.

Slip Boring
Slip boring is used to install pipe up to 42” diameter without leaving the casing in the ground: making it ideal for oil & gas pipelines. While casing is used to complete the installation, it is cut off and removed. The maximum installation length is 150 m.

Surface Casing (Conductor Barrel)
CT Underground provides accurate installation of surface casing required to guide horizontal directional drilling rigs. The angle can be set between 10° and 30°, with an average length of 30 m to 50 m. Casing installations can be done to a maximum length of 200 m.