UV Lining, Robotic Cutting & Trenchless Technology

“Gateway Construction Services Limited” have expanded their drainage division last year with a major investment in both industry leading equipment and personnel. Headed up by the newly appointed drainage manager Stamatis Ketsetzis, Gateway is now able to offer numerous options regarding drainage rehabilitation, inspection, cleaning and repairs including UV-lining, hydro-cutting, high pressure water jetting and CCTV surveys. Since July 2018, Gateway placed themselves at the forefront of the drainage industry area and developed practical, long term solutions to meet their clients varying requirements. Gateway has already signed a drainage framework with LUL (Track Partnership) for the next financial year (2019-2020) and quoted for various other LUL tenders.

No Dig UV Pipeline Repair Technology

This process involves the rehabilitation of drainage systems without the need for costly and disruptive digging of trenches. A structural liner is pulled through the existing host pipe, inflated with air and then cured in place with UV light, all this with the only access required being from two manholes along the length of the pipe. Lengths of up to 400m with diameters ranging from 150mm to above 1500mm can be installed using this method in a fraction of the time taken by traditional open cut methods. Any connections into the newly renovated pipe are then re-opened with the use of advanced milling machines which are driven into the pipe and controlled remotely from the vehicle on the surface.

Using this method means that assets can March 2019 be back in use within the same day, as a fully cured pipe within a pipe, perfect for situations where road closures or disruption to the railway would cause untold inconvenience and interruption to services. Varying pipe cross sections can be repaired using this energy efficient, low environmental impact method and many different shapes have been completed from the basic circular through to the more unusual.


Pipeline Inspection & Mapping

Gateway now use Mainline Tractor Cameras and Rigid Push Rod Cameras as part of their specialised drain clearing and pipe relining services. The CCTV drain cameras travel down into the pipes to conduct drain inspections and can show exactly what’s going on several meters under the ground. The drain camera technology is exceptional, with clear colour images that allow to identify issues within the pipe easily and confidently that could develop into damage later. The crystal-clear images can also show to expert staff exactly what is causing a blockage/problem in order that further damage can be prevented.

All cameras have built in Sondes which are locator devices used in underground surveying, which mean that the exact location and depth of the camera can be pinpointed in the drainage system. The huge advantage of this is that the blockage or damaged section in a pipeline or culvert can be found where exactly are or can even just surveyed so they can be mapped onto a site plan. The camera’s footage is recorded straight onto either memory stick’s or DVDs, so the customers can see exactly, and immediately, where the drainage problems are. Possible solutions can be then detailed to ensure that the problems can be rectified in the most cost and time efficient manner.

Point Repair Lining

1 A sectional point repair can be installed to repair any individual defect that may come across during the investigations/surveys. These are a costeffective solution when the whole line does not require rehabilitation. Defects can include root ingress, holes, cracks and defective joints in the ageing pipework and sections can be repaired up to 1200mm in length, in a single application and installed within a couple of hours on site.

After the defect has been identified, the line is cleaned, and the point repair prepared by wrapping a resin impregnated matting around an inflatable packer. This is then inserted into the pipe to the point of the defect (1.) and then inflated to a recommended pressure (2.). The repair is allowed to remain in position, under pressure, for a specified length of time before the packer is deflated, leaving the matting fixed in place covering and sealing the original defect (3.).


High Pressure Water Jetting & Root Removal

Gateway High-Pressure Water Jetting Units are designed as a high velocity water jetting system for the purposes of root removal, scouring and back flushing of sewers and drains. The high velocity water is propelled through nozzles via a pressure hose. Specialised nozzles are designed with positioned jets that allow it to self-propel and efficiently clean pipelines. The rate of travel is controlled by a hydraulic reel fixed to the rear of the vehicle. A large selection of specialist nozzles is stocked to enable the staff to cover a large variety of tasks including:

  • Clearing of blockages
  • Root removal
  • Debris removal
  • Encrustation removal
  • De-greasing

Ultra High Pressure Water Cutting (hydro-cutting)

Ultra High-pressure water Jetting (hydro-cutting) is a solution for cutting hard concrete and any other hard obstacle (e.g. steel) with needle jet precision and control. With pressures of up to 40,000PSI, Gateway makes light work of even the toughest materials in the most difficult to reach locations.