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A19 Coastal Road Improvements

Microtunnelling under the Coast Road and A19 roads.

An Overview

On behalf of the government and its Road Investment Strategy (RIS), Highways England is responsible for delivering the largest investment in a generation throughout England’s motorways and major A roads and the A19 / A1058 Coast Road junction is a key part of this investment.

The purpose of the scheme is to reduce traffic congestion at the junction of the A19 and the A1058 Coast Road in North Tyneside, by lowering the A19 beneath the existing A1058 Coast Road and roundabout. The construction work will involve the digging out of a new underpass to accommodate the A19, and the construction of three new structures to support the existing carriageways.

Seymour Civil Engineering were awarded the project to undertake the drainage kerb package on the £75m upgrade of the Silver link junction in North Tyneside, by Sisk Lagan who are constructing the triple decker roundabout, which will dramatically reduce the queuing time of people travelling along the A19 at peak times.

Joseph Gallagher were appointed by Seymour Civil Engineering to carry out microtunnelling under the Coast Road and A19 roads respectfully. The contract comprised of six individual road crossings be made up of one augerbore DN300 Clay Pipe and five microtunnels of varying diameters (DN600, DN900 and DN1200) concrete Jacking Pipes. Drawing expertise from ISEKI Microtunnelling, part of the Joseph Gallagher Group, we assisted our client with elements of the design, and advised which type and size of machine would be appropriate given the geotechnical investigations and drive lengths of each tunnel. We successfully carried out over 500 meters of microtunnelling through challenging ground conditions consisting of clays, rock, boulders and made ground at varying Depths of up to 10 metres.

Minimising disruption and mitigating impacts on communities

The main challenge was maintaining the project programme without any road closures and a safe working environment for our operatives. Microtunnelling requires a small site footprint, ideal for this project. The thrust and reception shafts were constructed within the Central Reservation and verges of the carriageways; allowing uninterrupted traffic flow during the construction and installation periods. Mobilisation, set-up and demobilisation of  all the tunnelling equipment was undertaken within these restricted areas and with minimal disruption to the community and clients. Traffic management provided safe exclusion zones for our operatives, other contractors and the public throughout these works.

Strong client relationship with added value and innovation

Our aim is always to work in an efficient and effective way that provides value for money. We have an excellent relationship with Seymour Civil Engineering and this is our fifth project in four years of working successfully together, scoring 37 out of 40 for client satisfaction. Through effective planning and early communication with SCE and the main client we were able to advise options for the temporary works which reduced the length of the thrust pit for the first crossing in half.

In June 2017, we completed the first two crossings of Phase One to programme and the other four crossings completed in the final phase by June 2018  two weeks ahead of programme.

“Operatives work safely and efficiently; the team and supervisors are happy to give advice on any changes to site conditions and amendments required” 

Marcus Swinburn Site Manager | Seymour Civil Engineering