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Drain Repairs using No Dig Technology


Resin lining

MJ Abbott are experts in No-dig drain repairs. This technology allows a drain to be repaired by installing a lining inside the existing drain which bonds to the inside of the pipe, thereby creating a “pipe within a pipe”. This system offers a cost-effective alternative to carrying out excavations to enable a conventional repair, particularly when excavations would disturb an expensive paved surface or structure that is directly above the defective drain.

Resin liners are generally installed in a continuous length between two existing manholes, but they can also be used for small patch repairs to single joints, displaced joints and fractures, or simply to re-line existing drains to give excellent resistance to root ingress, improved flow characteristics and years of future integrity. Different types of liner are available for use with straight or curved pipes. The liner is impregnated with resin and then inserted into the defective or damaged drain from ground level. A secondary inflation tube is installed to inflate the liner to the outer diameter of the pipe. Once the resin has cured, using ambient temperature or hot water, the inflation tube is removed to leave a smooth “ready for use” liner.

Drain patch repair

Often it will not be necessary to fully re-line a defective drain. Localised repair or patching is an effective method for carrying out “on the spot” repairs. The process is similar to that of re-lining, but instead utilises a short liner within a specific area of the drain to repair cracks or a displaced joint. Patching can be installed at any location within an existing drain without the cost of a full re-line.

A resin is used to impregnate a fibreglass mat, which is then pre-wrapped around an inflation device (known as a packer). The packer is pushed or pulled to the defective area and inflated. The packer presses the patch against the wall of the pipe which is then left to cure, typically for 90-120 minutes depending on the ambient temperature. After curing, the packer is deflated and removed and the patch is inspected using CCTV before the repaired pipe is recommissioned.

Patching has a number of advantages over intrusive repairs via excavations: multiple patches can be installed in a similar time to a single excavation; there is no mess or need for expensive reinstatement; the patch seals against root ingress; and patches can be installed in radius sections and bends.

Investigating a collapsed drain

Resin lining a domestic drain

Installing a patch using a packer

Checking the repair before recommissioning