Marton WwTW Outfall Adit

Contract Works:

- Fineturret Ltd were contracted to construct a 6m internal diameter shaft down on to a collapsed limestone tunnel built in 1876. Once the shaft was completed a sacrificial shield was driven up stream and 1052m ID PCC segmental rings were constructed behind to form the new tunnel lining. Downstream the tunnel was relined by building 1.52m ID PCC rings by hand before grouting the annulus between the ring and limestone.