Address: 11 Hockley Court, 2401 Stratford Road, Hockley Heath, Solihull, B94 6NW
Email: info@cpccivils.net Phone: 0121 766 7019
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Design by eSterling
Project Value
£750,000
Client Name
Galliford Try
Project Type
Sewage Treatment Works
Project Background
Working for our client, AGT (Aecom Galliford Try), we were tasked with delivering the Civils package on Tankersley STW in Pilley, South Yorkshire. The project, for Yorkshire Water, is required because…
A new WRA Consent set for introduction in 2018 will limit permitted Ammonia concentrations in the final effluent discharge to 1.3mg/L. Current performance of the STW typically achieves 4.8mg/L. It is therefore proposed to install new tertiary treatment, in the form of Moving Bed Biological Reactors (MBBRs), to enable the required final effluent quality to be achieved. The proposal will also require the installation of disc filters, pumping stations, pipelines and ancillary chambers and associated civil works, to facilitate the operation of the MBBRs.
As part of our package, we have constructed a new Tertiary Feed Pump Station, as detailed below.
Tertiary Feed Pump Station
This pumping station is made up of 2.7m dia pre-cast concrete rings, installed within a temporary cofferdam and surrounded with mass fill concrete. The pumping station has 3 no. pumps installed, with concrete benching formed to suit to assist with the water flow within the chamber. Coming out of the pumping station, there are 3 no outlet pipes ( all inter-connected to the new Tertiary Feed Pump main that supplies the new MBBR tanks), 1 no. inlet pipe from the existing works( that supplies the pump station with water) and electrical ducting pipe penetrations, as well as a drain from the above ground valve manifold slab. The Pump station works also included forming the new valve manifold slab, installing pre-cast “L Shape” retaining walls and a concrete hardstanding to tie in to existing levels
200mm thick concrete base was cast, with the bottom ring set up on concrete blocks to allow the concrete to flow around it to “trap” it in and seal the bottom of the pumping station. Once complete, the remaining rings were lifted into position and sealed using “Tokstrip” and a mortar mix to plug lifting holes etc. As the rings were installed, visqueen was placed inside the trench up against the trench support so the concrete surround to the PS could be placed without the need for surround shutters. As concrete was placed, the trench support was extracted to avoid it becoming trapped in the excavation. This was followed until we were up to ground level
To form capping beam (for steelwork supports) a temporary scaffold was installed to deck out the pumping station so shutters could be drilled and fixed internally. An access scaffold was erected to get onto the boarded out area, checked weekly by our scaffold contractor. Shutters were erected and concrete placed. To allow for the steelwork decking on top of the pump station, several box outs were formed for the M&E contractor. We left the handrail around the PS and will finish the remaining footpaths/pipework once the M&E install is complete
