PW Trenchless and the City of Victoria engaged in the Rehabilitation of an almost 100 year old Sewer.
Victorian era Victoria B.C. quickly outgrew it’s existing cemetery by the early 1870’s. The City purchased 12 acres from Robert Burnaby Ross Bay Cemetery where it’s first inhabitant, Mary Pearse, was buried in December 1872. Within 50 years, it was already close to capacity, so a new Royal Oak Burial Park was built.
Originally the Ross Bay Cemetery had a few creeks running through it, so storm sewers (1550mm wide x 995mm high) were built to allow for the creeks to be filled in, allowing for more area for graves. The creeks, of course, do not run in straight lines, so the actual sewer is a hand built dual layer of bricks that has many curves and elevation changes.
The cross-section is a half-circle from 9.0 through 12.00 to 3.00 and a gentle V in the invert. It is approximately 1.6m wide and 1.2m high. The alinement also goes through 10 horizontal bends ranging from 5 degrees to 45 degrees, and 4 vertical steps of up to 1m high in the floor. Thus, any liner product had to be brought into the pipe and through these vertical and horizontal transitions. There was no access to the long pipe except at the ends and through one 4m x 2.4m pit in the middle.
This challenging alignment called for a pipe material that could be formed to incorporate a non-circular cross-section, horizontal bends, vertical bends and satisfy structural requirements. Glass Reinforced Plastic (GRP) was the selected material, supplied by Chaneline International. GRP is a precast segmental liner which allows for, after a meticulous measuring process, each section of GRP to be hand formed and specifically designed for a particular location in the host pipe before being shipped to site. GRP can also be designed as a Class I or II liner which assumes either full or partial deterioration of the host pipe.
PW Trenchless and the City of Victoria engaged in the Rehabilitation of an almost 100 year old Sewer. Victorian era Victoria B.C. quickly outgrew it's existing cemetery by the early 1870's. The City purchased 12 acres from Robert Burnaby Ross Bay …See Project
While rehabilitating the Trans Canada Airport Culvert, it was decided to employ a full Sliplining method in order to repair the second culvert. New culvert pipes that are slightly smaller than the existing culvert were delivered to the south end …See Project
Over the years P W Trenchless has rehabilitated over 10 of the large diameter culverts that run under Highway 99 South of the George Massey tunnel. Because these culverts are all multi-plate pipe arches and are exit-controlled type culverts, they …See Project
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.