What we’ve done so far: Sewer shafts
All three shafts providing access to the new sewer are now complete with only some minor finishing works to be done. The accompanying image shows the view looking along the new tunnel section.
The Pinkston sewer diversion consists of three shafts located along Pinkston Road. Manhole 1 (MH01) is located in the vicinity of the existing Fountainwell Road junction; Manhole 2 (MH02) is immediately next to the junction of Pinkston Road and Pinkston Drive; and Manhole 3 (MH03) is located to the South end of Pinkston Road.
Shaft (Manhole) 1
Works to construct the 16 metre deep and 5 metre diameter shaft are now complete and the concrete base has now been poured. The next phase of works which we have already commenced is a hand drive (hand dug by miners) tunnel towards the upstream connection manhole.
Shaft (Manhole) 2
Works to the largest of the shafts shaft are now complete, this includes a 1 metre deep base of reinforced concrete which has had 74 m3 of concrete pumped into shaft to create its concrete base. The Tunnel Boring Machine, (TBM) named Lilly Rose, has been successfully launched through what is called the shaft’s eye towards shaft 1.
Shaft (Manhole) 3
Works have begun on shaft 3 which is a 5 metre diameter set of concrete rings which are sunk/driven by hydraulic jacks 14 metres beneath existing ground level. The ring installation is now approx. 65% complete, we aim to pour the concrete base slab in the coming weeks.