Joint Sealing

Definition - What does Joint Sealing mean?

Joint sealing is a trenchless rehabilitation technique to repair leaking joints in underground sewers. A packer is inserted into the pipe in a position where it covers the joint, it is then pressurised to test the rate of leakage. Once a leak is identified, a grout or resin material is pumped into the joint via the packer to seal the leak.

Trenchlesspedia explains Joint Sealing

Ageing underground sewers are vulnerable to leaks at pipe joints due to ground movement over the years, corrosive waste products and the deterioration of the pipes themselves due to the material used at the time. Leaks will either result in groundwater entering the sewer and overloading the downstream processing unit or waste leaving the sewer and contaminating the soil. Joint sealing is a rehabilitation technique that can be carried out from inside the pipe eliminating the need for excavation. Packers are specially designed to test and seal pipe joints. Grout and resins have also been developed to effectively seal leaks as they set into a water tight barrier.

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