Microtunneling is a remote guided process of using a smaller version of a Tunnel Boring machine to install new pipelines. In the 1990’s we were active with Microtunneling technology, but at that time the local market was not quite ready for it. While we currently do not practice this methodology ourselves at PWT, we will team up with other contractors who specialize in Microtunneling.
Microtunneling Machine (MTM) systems do not have man entry capabilities. The new carrier pipes are used to jack the MTM and keep a constant pressure against the material being removed in front of the cutting head. The MTM removes material with the application of pressurized bentonite.
The MTM has a video camera installed internally and a guiding Laser projected onto a target that is read on a monitor in the operator’s quarters next to the entrance pit. This allows for very accurate placement of the pipe as the MTM can be steered remotely by the operator.
To reduce the friction associated with microtunneling, over cutting the bore hole allows for a small void between the pipe and the soil which is filled with bentonite. The use of a bentonite slurry as an injected lubricant reduces friction but also stops loose material throughout the excavated tunnel from entering the void and increasing friction.
This method only requires a small entrance and exit pipe to be excavated and a very small amounts of material to be removed from the microtunneling process. No material needs to be trucked in except for the entrance and exit pit infill.
An alternate tendering process where the contract is awarded to one entity which comprises both engineering and contracting.
Because PW Trenchless Construction offers such innovative solutions for underground utilities, it is often beneficial for the owner to request solutions based on a performance specification. This allows PW Trenchess to offer unique solutions while working with equally innovative engineering companies.Learn More
New installation methodologies include HDD & traditional open cutLearn More
In this day & age of pipe systems reaching the end of their projected lifespan, pipe replacement and pipe rehabilitation have become major fields of engineering.
PW Trenchless Construction provides viable options such as pipe bursting, loose fit lining and internal pipe re-construction whether partial & fully circumferential.Learn More
The aging culverts under roads and highways in many case have reached the end of their engineered life-span. We consider the rehabilitation or replacement of these culverts to be vital to our built environment.
PW Trenchless has been a pioneer in working with MOTH, railway companies and municipalities in developing rehabilitation methodologies for the hundreds of thousands of culverts that currently exist in BC. We have offered solutions in both procurement and construction from design-build to sliplining, invert rehabilitation and full circumferential relining.Learn More
Often pipe failure can be concentrated to one section, for various reason, leaving the rest of the pipe in good condition. The repair of these localized failures are know as external point repairs (EPR's).
EPR's demonstrate PW's ability to work as both a trenchless and civil contractor, completing EPR contracts using our civil contracting skills and assisting other pure trenchless contractors who only have the capacity to work in an existing pipe.Learn More
Pipe upsizing is the fundamental concept of pipe bursting.
The vast majority of pipes are less than or equal to 200mm in diameter, but with today's densification practices of urban design, there is a major demand to increase current capacity to handle extra flow. Pipe bursting provides the ideal solution to this issue, particularly in an urban setting .Learn More
Horizontal Directional Drilling is a low impact Trenchless construction service where pipe is installed in a shallow arc along a bore path which has been created by a drilling rig. Often the terms Horizontal Directional Drilling (HDD) and Directional Boring are used interchangeably, but in our industry we use the word “boring” when we utilize smaller sized drilling rigs with small diameters for short crossings in the hundreds of feet, and we use the word “drilling” when we utilize larger rigs with large diameters for long crossings in the thousands of feet.Learn More
When you join PWT, you become part of a community of people who are engaged in the most innovative practices in the Trenchless Industry. We have been instrumental in setting up a scientific method for cities to gain carbon offsets/credits from their use of trenchless construction. This system has been reviewed by the BC Government and has been approved as of December 2018. We expect to see it in common use shortly.