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SPECIAL WORKS


IWJS undertakes No Dig structural relining works to minimise disruption on Cambridgeshire Culvert Project


IWJS, a part ofMGroup Services, has delivered structural renovation liningworks to thirteen sections of culvert in Leverington, Cambridgeshire, on behalf of North Level District InternalDrainage Board (NLDIDB).


The NLDIDB is an area of the Fens that is largely reliant on pumped drainage to evacuate surplus water fromagricultural, industrial and urban properties, discharging to adjacentmain rivers.


The reliningworks in Leverington cover 421mof culvert, ranging in diameter from600mmto 1,000mm. IWJSwas appointed to deliver the works after detailed asset condition surveys highlighted structural and service defects throughout. Thework undertakenwill extend the life of the asset and ensure adequate drainage systems aremaintained as part of a larger programme of culvert reliningworks that IWJS is delivering in Cambridgeshire on behalf of NLDIDB.


After initial camera and laser profiling surveys revealed that sections of the assetwere larger in diameter than records indicated, the technical, structural design of the liningswere amended to reflect the changes, internal hydraulic flows and external ground loading.


Environmentally compliant and safeworking areaswere established at each culvert entrance andmitigationmeasures included the use of temporary inflated dams and over pumping at the outfall position to remove water held and tomanage flows in a safe and controlledway. Large diameter bungs, pumps and intermediate damswere also used to isolate individual sections and to control flows during the installation of the liners.


CCTV surveyswere carried out before high pressurewater jettingwas used to clear each culvert of silt and debris. All parts of the overall culvert assets, includingmanhole sumps and themouth of the outlet,were also desilted.


A robotic cutting unitwas used to remove several intruding connections, eliminating any obstructions thatwould prevent or limit the lining installation. In total, 22.7 tonnes of silt and debriswas removed fromthe assets.


Accessibilitywas a key engineering challenge throughout theworks. To avoid the required


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specialist equipment causing disruption to local residents, the IWJS installation team manufactured and installed a bracing system designed to sit on the outside of the existing concrete headwall and hold a double roller systemin place in order to aid the liner installation.


The bracing systemenabled the large diameter lining to bewinched into place a significant distance fromthe delivery vehiclewhichwas positioned away fromlocal properties to minimise disruption. This innovation behind this liner installation process proved to be a key


| February 2021 | www.draintraderltd.com


factor in its success and achieving community satisfaction.


Once all structural linerswerewinched into place, inflated and cured using a fast UV process, the connections into the culvertswere reopened using robotics, togetherwithmanholes that were lined through in the rear of properties for which vehicle accesswas not possible. The ends of the linerswere trimmed post-lining,whilst CCTV surveys showed that all linerswere successfully installed and cured, leaving the existing assets structurally sound and free flowing.


IWJSManaging Director, Christopher Stewart, commented: “IWJS provided a full solution throughout this project, fromthe initial detailed asset condition survey through to the design of the structural lining solution, the use of robotics to remove obstructions, the deployment of fast UV cure lining technique and the final commissioning. Thiswas a complex project and we are delightedwith the positive client feedback on our approach to renovating these culverts,whilst keeping disruption to the local community to aminimum.”


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