Drain Technology offer manhole and tank rehabilitation services. Whether a large volume man entry tank or a small inspection chamber, we have the ability and product range to stop and seal water leaks from entering through concrete and brick surfaces.
Using a special polyurethane resin, which is injected through the wall of the manhole or tank, we can seal cracks and holes while also filling voids that is allowing water through, even when under pressure.
By drilling holes around the leaking area and inserting intake valves, we can inject the polyurethane resin using a specially designed air injection gun. This resin reacts with water and can expand up to 37 times its original substance depending on back pressure, creating an environmentally friendly foam material that is water tight. Once sealed, the valves are snapped off and the excess foam removed before a quick drying cement is used to top off any sealed gaps left.
A new drainage system on a recently developed housing estate was on the verge of being adopted by the local authority. During the drainage cctv survey, it was established that 12 manholes had water infiltration coming in through either the concrete rings or cement benching that was causing the down stream pump station to continually be overloaded.
Drain Technology attended site and held a pre-works consultation meeting with the groundworker to discuss options. It was decided that our resin injection sealing system would be far more cost effective, less disruptive and far quicker than manually repairing, or worst still, excavating and replacing individual manholes.
A two man team attended the site. Using confined space technics along with the resin injection system, over 3 days we managed to repair every leak saving the ground worker money and time, while also his reputation with the main house builder who was waiting to hand over the system.