CASE STUDIES
Germany to the UK - No problem! A post-Brexit, trans-Europe, supply chain success story
By LeonWoods, Amiblu
Structural Rehabilitation, Gipsy Patch Lane, Bristol PROJECT PARAMETERS
Country / City UK, Bristol
Year of Construction 2021 Installation Time 4weeks Application Sewer Rehabilitaion Intallation Trenchless Technology Technology Hobas
Total Length of Pipe 280m
Nominal Diameter DN (mm) DN800 Nominal Pressure PN (bar) PN1
Nominal Stiffness SN (N/mm²) 32,000 Client South Gloucester Council
Contractor Matt Durbin Associates Ltd Consulting Engineer South Glos Council
Gipsy Patch Lane, Bristol is amain road forming part of a newCribbs Patchway Metrobus route in South Gloucestershire. As part of an asset assesment programme a fewyears ago, a CCTV survey showedmany defects throughout the length of the surfacewater culvert at Gipsy Patch Lane. The defective sections ran under the busy carriageway so, as an interimmaintenance measure the local authority excavated a section of the road and installed a concrete slab over the pipe to protect it fromfurther deterioration or collapse.
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During heavy rainfall over the summer of 2020, the same pipewas found to have suffered structural defects and root ingress through open joints and connecting laterals resulting in localised blockages of up to 90%. A newman-entry survey showed the pipe beneath the concrete slab to be deformed.
Majorworkswere already underway in the area to replace a railway bridge on Gipsy Patch Lane, so South Gloucestershire Council took the opportunity tomake improvements to the sewer in conjunctionwith the Network
| June 2021 |
www.draintraderltd.com
Railworks tominimise disruption,whichwas further aided by lighter traffic due to the regulations set in place for Covid-19 pandemic.
Under the Council’s Climate Resilient Scheme, the taskwas to find and deliver a suitable solution before opening the road up to traffic and risking a pipe collapse; two optionswere considered; open-cut to replace the section of pipe or trenchless technology to reline the affected pipewith little disruption to the area.
DougMacKay, Projectmanager, South Gloucestershire Council consultedwith Julian Britton, Critical SewersManager,Wessex Water andMatt Durbin Associates; specialist confined space and GRP structural relining installer to determine themost efficient and economic technique. Aswithmany suburban roads, Gipsy Patch Lane is ladenwithmany serviceswithin the carriageway, so rehabiliatation of the existing pipeline through trenchless installation of 210mx DN800 structural GRP jacking pipe supplied by Amibluwas decided upon. As the contract was classed as emergencyworks, subject to time constraints and speed of execution the use of Amiblu’s GRP pipesmeant thatMDA
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