- Caisson shaft & cover slab (10.5m ø, 13m deep).
-The shaft was constructed bia a jacked casisson and the base cast underwater.
-Once the sewer connections had been made into the shaft a PCC cover slab was installed on top of the shaft. The cover slab consisted of 2No support beams weighing 22Tn each and a 13 piece slab arrangement. A 300mm concrete screed was then cast above the cover slab.