We at Thor civils offer a comprehensive shaft sinking service, ranging from standard sheet piled shafts to specialist Caisson shafts concrete construction. Our vast experience in this field enables us to provide a comprehensive and complete shaft sinking service, coupled with a high degree of customer interaction and competitive pricing arrangements.Timber frame shaft sinking Ideal for restricted areas such as gardens, basements or pedestrianised areas. Bolted ring shaft sinking can be installed by manual or machine excavation and used where access is restricted due to their segmental construction. Diameters range from 2 metres to 25 metres. Bolted ring shafts can be converted to manholes. Caisson shaft sinking a one pass liner usually installed with machine excavation/hand trimming. Diameters range from 1.5 metres to 4 metres. Sheet piled shaft sinking usually for temporary access during construction. The shafts are mechanically excavated, with the sheet piles being driven in as excavation progresses. Sizes range from 1.5 metres sq. to approx 5 metres sq.