Repairing damaged drains under a working transport yard

Digging up a transport yard is expensive in ways that never appear on the repair invoice. Lanes close, trailers have to be parked elsewhere, reversing areas shrink and the open trench becomes a hazard that has to be managed through every shift change. That is why relining appeals to depot managers. It is also why they need to understand when it will not work.

What relining can and cannot do

Relining installs a new lining inside the existing pipe, working from chambers rather than from a trench. Where a drain has cracks, leaking joints or root entry, and the surrounding pipe still holds its shape, a patch or a longer liner can often seal the damage without breaking the yard surface. For a site that cannot afford to lose its turning area, that is a real advantage.

It will not correct everything. A collapsed section, a badly displaced joint or a pipe that has lost its fall may still need excavation. A yard drain should not be assumed suitable for lining until a survey has shown the condition along the damaged length.

Planning around the vehicles

Even a no-dig repair brings vehicles and equipment into the yard. A jetting unit cleans and prepares the pipe first, then the lining crew works from the access chambers with its own van or trailer. Where chambers sit in vehicle lanes, the depot needs a way to keep vehicles clear of the work area and let drivers know which routes are affected.

Curing time is the other constraint. Some lining methods require flow through the repaired section to be stopped during curing. If the run serves the driver welfare block, wash bay or workshop, the depot needs to check whether those facilities will be affected and tell drivers and fitters about any temporary arrangements.

When excavation is unavoidable

• Fence the excavation from vehicle paths and keep plant clear of reversing areas.
• Plan the reinstatement for the loads the yard actually carries, not for a footpath.
• Allow time for the new surface to gain strength before laden vehicles cross it.
• Agree temporary parking for trailers displaced by the work.

Keeping the record

A repaired drain under a yard is out of sight within a day. The maintenance file should hold the survey that justified the method, the length and position of any liner or patch, and the inspection of the finished section. If problems return, or the site is sold or re-let, that record saves a second investigation.

Drain Relining covers CCTV surveys, patch repairs, relining and excavation, with the method chosen from the condition of the pipe. At a depot, the method is only part of the decision. Vehicle access, the location of chambers and any interruption to drainage all need a place in the maintenance plan.