Scope: – The project was highlighted as critical as Scottish Water were due to be fined by SEPA due to the number of bursts on the existing sewerage network causing environmental issues to the coastal town of Troon.
The project was a Design and Build, 3km of 800mm & 900mm HPPE Pumped Sewer Open cut in carriageway type 1 and fields.

We also had to install two 14m deep chambers in peat at either side of the railway to allow tunnelling under the railway. The project started at the junction of the B746 / A759 and connected into the Meadowhead Treatment works.

The pipe was butt fused using a 1200mm McElroy Butt Fussing Machine shimmed down to 800mm & 900mm, the project was completed without using any mechanical joints.
Part of the scope was also to replace a section of the 38” Steel main which ran under the A78. This was done by sinking two coffer dams to allow access to the pipe. This was 24m in depth at either side of the motorway and allowing the existing pipe to be slip lined with a new 800mm HPPE pipe and tied back in installing two new control valves at either side including associated chambers.
Part of the scope was to install two 14m deep concrete chambers / shaft in peat at either side of the railway to allow tunnelling under the railway.

The chambers / shafts were used as launch and receive pits for the tunnelling machine. We installed a precast concrete segmental shaft at each location. These were installed using both the caisson method and underpin method, due to the ground conditions which we encountered.

The project was delivered on time and within budget.