Our expertise

“It is necessary to maintain and preserve our existing infrastructure.”

We know that the deterioration of the underground infrastructure poses risks to public health and safety.

Logistique St-Laurent specializes in trenchless rehabilitation of pipes and other infrastructure, and helps meet the needs of each municipality. Our state-of-the-art specialized equipment allows us to offer services catering to the needs of our customers. Research and development are at the centre of our activities and enable us to develop and offer innovative, cost-effective, and durable rehabilitation technologies.

Our services can be applied to installations such as:

  • Drinking water pipes
  • Culverts
  • Other accessible structures

 

Drinking water pipe rehabilitation

“Renew and extend the service life of pipes for decades.”

A significant percentage of the drinking water pipes are nearing the end of their service life. We can act now to extend their service life and generate significant savings in the short and long term.

Here are some of the problems we can fix:

  • Quality and/or colour of deficient water (non-compliant levels of chlorine residual)
  • Inadequate pressure and flow
  • Leaks and breakages
  • Increased network operating costs (emergencies, maintenance, treatment, compliance with standards)
  • Environmental constraints

We have developed an efficient, fast, and economical method to preserve the residual structural integrity of pipes and to permanently reduce the harmful and continuous effect of corrosion on the internal wall of pipes.

 

We offer two rehabilitation techniques for drinking water pipes:

  1. Non-structural rehabilitation using the Tomahawk aerodynamic method.

For non-structural rehabilitation, NSF/ANSI 61 certified polymer resin is injected into the pipe immediately after cleaning and, aspirated by the air of the vacuum truck, takes only a few minutes to cover the inner wall of the pipe. A disperser is introduced into the pipe to ensure uniform distribution of the resin on the wall, in the joints, and around the service lines. The resin remains malleable during its dispersion and begins to harden once applied to the pipe so that service can be resumed on the same day. Quality control and disinfection of the pipe are carried out according to the standards.

 

The Tomahawk technique can be used with cast iron and asbestos cement pipes with diameters ranging from 100 mm (4 in) to 300 mm (12 in), inclusive.

 

  • Video of the Tomahawk technique
  • Tomahawk fact sheet
  • Case study

 

  1. Structural rehabilitation through Acuro polymer resin spraying.

For structural rehabilitation, a gun is introduced into the pipe to spray the Acuro polymer resin following cleaning. The polymer resin, which is NSF/ANSI 61 certified, sets in seven seconds and is dry to the touch after 30 seconds. Consecutive layers of one (1) millimetre in thickness are applied to achieve the required thickness according to the design specified by the ASTM F1216 standard. It is possible to put the pipe back into service 30 minutes after the final spraying. Quality control and disinfection of the pipe are carried out according to standards.

The Acuro technique can be used with cast iron and asbestos cement pipes with diameters of 150 mm and more.

 

  • Video of the Acuro technique
  • Acuro fact sheet
  • Case study

 

The benefits of the drinking water pipe rehabilitation techniques include:

  • Trenchless technologies
  • Return of service within 24 hours (optional temporary network)
  • Hydraulic capacity restoration
  • Improved water quality
  • Excavation at the T-connections of fire hydrants or adjacent pipes not required
  • Economic and durable techniques
  • Very low GHG emissions during construction compared with replacement

 

Culvert rehabilitation

“The most economical and efficient solution to extend the life of flexible (GCIP) and rigid (concrete) culverts.”

Without interfering with road traffic, the rehabilitation technique for accessible culverts allows to correct structural anomalies, fill cavities behind the wall, repair the invert, and spray anti-abrasive structural polymerized resins (double-layer coating) to reinforce the culvert, protect the inner wall from corrosion and abrasion, and add decades of service life. In addition to rehabilitation, we offer a CT scan service to detect cavities behind the wall of flexible sheet metal culverts.

 

Accepted studies indicate that more than 80 years of life are added to culverts following the spraying of polymer resin.

 

  • Video of the rehabilitation technique
  • Fact sheet
  • Case study

 

Benefits include:

  • Minimal reduction of the original diameter following the rehabilitation
  • Use of environmentally friendly products
  • Works can be performed all-year-round
  • Targeted ad hoc repairs
  • Filling of the lining surrounding the culvert
  • Polymeric resin coating of structural strength and design according to the ASTM F1216 standard
  • Double-layer coating to enhance abrasion resistance and facilitate subsequent visual inspections

 

 

Other accessible structures

The manual spraying technology we use can be applied to the rehabilitation of structures of all shapes and sizes. These structures, which need to be accessible, include drinking water, rainwater or wastewater pipes, as well as manholes, tanks, access chambers, ponds, gutters, floors, walls, ceilings, and the like. The resin can be applied to most substrates, including cast iron, concrete, steel, wood, or other materials, which require waterproofing, structural reinforcement, and/or chemical resistance.

  • Video of the rehabilitation technique
  • Fact sheet
  • Case study

Achievements / Challenges faced

Corrugated Steel Pipe (culvert) Rehabilitation

The aged culvert was showing severe signs of corrosion and infiltration. The spray-on method was...

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