Innovative ‘No-dig’ sewer repair underneath two multi-occupancy houses

Using our ‘no-dig’ technology we successfully repaired two sewers underneath multi-storey accommodation, saving our client tends of thousands of pounds and mass disruption. One in-line trap was collapsed and the second was on a 90 degree bend.

AW site set up

Innovative ‘No-dig’ sewer repair underneath two multi-occupancy houses

Using our ‘no-dig’ technology we successfully repaired two sewers underneath multi-storey accomodation, saving our client tends of thousands of pounds and mass disruption. One in-line trap was collapsed and the second was on a 90 degree bend.

Innovative ‘No-dig’ sewer repair underneath two multi-occupancy houses

Using our ‘no-dig’ technology we successfully repaired two sewers underneath multi-storey accomodation, saving our client tends of thousands of pounds and mass disruption. One in-line trap was collapsed and the second was on a 90 degree bend.

Collapsed sewers underneath multi-storey building

Project Overview

Danaher & Walsh Advanced Pipeline Solutions is on a long-term framework for Anglian Water, along with several other companies that make up the IMR WR Alliance.

This particular job was so complex that Anglian Water asked our ‘no-dig’ team to find a trenchless solution to this challenging repair.

Location

The in-line traps were located UNDERNEATH the multi-storey buildings. The access point was located inside the cellar, which meant going through the premises, along a corridor and down a narrow staircase into a basement with a shallow ceiling.

Before we were assigned to the project, previous engineers had suggested excavating and tunnelling under the property to reach the collapsed inline traps.

Round the Bend

In addition, the location of one of the two in-line traps was beyond a tight bend in the pipe, so it was very difficult to reach.

Outcomes

Utilising our innovative ‘no-dig’ technology, we were able to access the pipe and reach the collapses via the manhole covers in the cellars using remote cameras and robotic equipment.

To allow us to carry out the repair around the tight bend we fed the patch through a guide tube. The guide tube was then removed so the patch could be pulled back into place and inflated.

Completing these two jobs, including the clean-up, took just four days instead of multiple weeks, as had been forecast by the earlier engineers.

Anglian Water believes our ingenuity saved them tens of thousands of pounds on this job alone, with the potential to save many hundreds of thousands of pounds down the line, as well as reducing the H&S risks due to the less invasive procedure.

Key Details
  • Client Anglian Water
  • Expertise Pipelining
  • PDF Case Study View

Difficult access into the basement of the property

Collapsed in-line trap removal

Pre survey footage
In progress footage
Post survey footage

90 degree in-line trap removal

Pre survey footage
In progress footage
Post survey footage
Right Arrow Down Arrow List Tick Left Arrow