Slot Trenching · Cambridge
Hydrovac Slot Trenching in Cambridge
A trench across a shipping yard has to be open for the shortest possible time and cross everything in its path without touching it. That is a slot trench, and it is why hydrovac gets the call.
Slot trenching is hydrovac along a line. The water and vacuum cut a trench commonly 150 to 300 mm (6 to 12 in) wide to the depth the new line needs, and every existing service the route crosses is exposed intact as part of the same pass. In a Cambridge industrial yard the alternative is a trencher that stops at every locate mark for someone to hand-expose the crossing, or a backhoe that opens a trench wide enough to shut down a traffic lane for days. The slot is narrow enough to plate, and plated steel over a slot is something a forklift can cross at the end of the shift.
Where it is used in Cambridge
- Across working yards in Hespeler and along Pinebush and Boxwood: new conduit between buildings, compressed air to a new line, data between production and shipping, fire alarm and monitoring runs to an outbuilding.
- Logistics sites along the 401 and Franklin Boulevard: feeds for yard lighting, gate controls, camera poles and EV charging for fleet, across acres of pavement with truck traffic that does not stop.
- New service connections from the main to a building across a boulevard and sidewalk in Galt and Preston, where the ground already carries a century of lines and the right-of-way work needs the City's Highway Occupancy Permit.
- Residential EV charger and drainage runs across driveways and established gardens in the city's neighbourhoods, where a saw-cut slot disturbs far less than open excavation and tree roots are exposed rather than cut.
How a slot trench job runs
The route is marked. The One Call locate is complete and, on a plant site, the drawings have been reviewed and a private locate done. If any part of the route is in the right-of-way, the City of Cambridge Highway Occupancy Permit is in place with its notice period, insurance certificate and Book 7 traffic control; excavating, cutting and trenching are named activities under that permit. Pavement is saw-cut to the slot width. The trench is cut in sections, spoil to the debris tank, crossings exposed and recorded as they are met. The installing trade lays the conduit or pipe, the trench is backfilled with the specified bedding and granular material and compacted, and the surface is restored or plated for the next window. On a running plant, the windows are often nights or weekends.
Limits
In open ground with nothing in it, a trencher is faster and cheaper per metre, and that is what we will say. The efficient arrangement on a long run with a few congested sections is a trencher for the open ground and hydrovac for the crossings and the paved yard. Depth and length drive slurry volume and disposal loads, which with saw-cutting, plating and restoration are most of the quote.
Frequently asked questions
How narrow can the trench be?
About 150 mm (6 in) for a small conduit, wider where pipe size or bedding call for it. Narrow is cheaper to restore and easier to plate, but slower to take deep, so the width follows the pipe.
Can the yard stay open while you trench?
In most cases yes. The work is coned to a section, the open slot is plated at the end of each window, and traffic routes around the active section. Night and weekend windows are common in Cambridge plants and are priced as such.
Do you install the pipe or pull the cable?
No. The trench and the exposed crossings are our part; the electrician, millwright, gas fitter or fibre contractor installs their own line to their own standards and inspections. Running both crews in the same window is the cheapest sequence.
Serving Cambridge and surrounding areas. Contact us for a no-obligation quote specific to your property.