Case Study – Pipe repair excavation – Claire and Chris Hawes

UKDN Waterflow

Project: Pipe repair excavation

Client:  Claire and Chris Hawes

 

The Challenge

The blockage in the pipe was very close to the back of the house. This meant care was needed to avoid damaging the foundations. Because the pipe ran from under a basement, it was also three metres underground, so a lot of material had to be dug out to reach it. However, access to the Victorian terraced house was limited. The back garden is enclosed in high brick and flint walls. This hampered removal of excavation spoil.

The Solution

UKDN Waterflow (LG) Ltd put together a detailed plan approved by the Hawes’ insurance company. Key elements were:

  •   A CCTV drainage survey was carried out to assess the blockage
  •   A structural engineer carried out a survey of the garden walls, which resulted in strengthening work to ensure they would not be undermined by the excavation
  •   The team negotiated with two neighbours to allow 16 tonnes of spoil to be moved on four conveyor belts to land at a nearby garage where it could be dropped into a skip
  •   Because of lack of access for plant equipment, the hole – 1.5m square and 3m deep – would be dug by hand. This also ensured the house’s foundations would not be damaged.

“The UKDN Waterflow drainage engineers were very thorough and methodical. They worked very well with our insurance loss adjuster and with us to find the right solution. They were professional, friendly and efficient. Also, unlike previous drainage contractors, they always did what they said they would do, and communicated brilliantly.”

Claire Hawes

The Customer

Claire and Chris Hawes live in a terraced house in Lewes, East Sussex. They had been experiencing a drainage problem with their foul drainage pipe for eight years. Sewage regularly backed up in it, causing internal floods. Two other contractors had tried to fix it. Both failed. Bad smells associated with the blockages were discouraging their son’s friends from visiting. The Hawes family was desperate for a permanent solution.

The implementation

HD video footage from the CCTV drainage survey, and evidence found during the excavation, found the blockage was caused by a collapsed Buchan trap. This is a device commonly fitted in Victorian properties to keep out vermin, but not needed with modern plumbing.

Overpumping was put in place to take wastewater from the house while the excavation was carried out. Health and safety is a number one priority for UKDN Waterflow (LG). Extensive shoring protected the excavation team and prevented damage to the house and garden walls.

UKDN Waterflow (LG) replaced the Buchan trap with a straight section of pipe. A full-sized manhole was also installed. This gives the best maintenance access to prevent further blockage problems.

The Results

  •   The blockage problem was solved – and the foul water pipe worked perfectly for the first time in eight years
  •   Future inspection and maintenance is made easy
  •   The working methodology meant the Hawes family could remain at home while the work was done, saving them huge inconvenience and their insurer money
  •   And friends of the Hawes’s children are happy to visit once again.

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