This project involved the refurbishment and strengthening of an existing vehicular access bridge, which was displaying signs of severe corrosion. The bridge spans a spur section of the River Thames; connecting the “mainland” of Old Windsor to Ham Island.
To enable the works to take place under the bridge Barhale secured a permit with the Environment Agency (EA) to block the river from early November 2016 until late January 2017, with a temporary pontoon system. The majority of work was then permitted to take place from on top of this pontoon.
In order to reduce the risk of internal and external sewer flooding to 36 local properties, Barhale were contracted by Thames Water during AMP 5 to install flood alleviation measures in the Chamberlayne Road area of Brent, North West London.
To increase the network capacity, the scheme was originally proposed as a series of open cut sewer upsizing works, however due to time constraints on the programme and the disruption open cut trenches would cause to the area, Thames Water asked their partners to propose an alternative solution. Barhale suggested a micro tunnelling solution in order to provide the following benefits:
• Minimise the disruption to the local roads and residents
• Use the large diameter jacking pipes to maximise the online storage capacity (additional 800m3)
• Minimise the risk of digging around buried services in the highway
• Shorten programme duration
Barhale were awarded this £6.4 million scheme by Severn Trent Water
to upgrade the sewerage system within Albrighton, Shropshire.
The village of Albrighton had experienced substantial flooding in
recent years, due to lack of capacity in the existing sewerage system,
coupled with the volume of surface water flowing into a local brook.
Barhale offered an innovative solution to the client through carrying
out micro-tunnelling to a curved profile. This was one of the first
micro tunnels in the UK to be cut on a curve through rock and
provided a £300,000 cost saving to the client, Severn Trent.
Barhale, through Optimise, were instructed to isolate and repair a burst
section of a 20” water main, as it crossed over the New River aqueduct,
close to the Hornsey WTW. The Emergency works carried out for
Thames Water were completed in 2 phases.
Phase 1 consisted of isolating the water main 500m away from
the damaged section, using a linestop and installing a valve
arrangement.
Phase 2 of the works included; twice daily infusion works to
maintain pressure in the live network behind the newly installed
valves, investigative works including boreholes and NDTs and the
replacement of the damaged section of the pipebridge.
Delivering an iconic pumping station as part of the Olympic development site. Barhale was awarded a £21 million contract by the ODA, to design and construct a primary foul sewer and pumping station, as part of the Olympic Park development.
The Primary Foul Drainage is a park wide utility which collects, conveys and discharges flows from the main venues, buildings and residential developments during the Olympic, Transformation and Legacy Modes. The system receives flows from the secondary foul drainage system and conveys flows by gravity to a terminal pumping station which discharges to the Thames Water Northern Outfall Sewer.
This highly complex, multi-disciplinary scheme included the construction of 2km of deep sewer in tunnel, 13 No. shafts ranging in size from 4.5m to 12.5m diameter and a large pumping station which formed the centre-piece of the contract.
Barhale Installed a boat ramp for Putney Rowing club who had previously had to access the River Thames 200m upstream from the clubhouse.
Although accustomed to working with water, the tidal constraints of the river made this project challenging
The River Thames is tidal – water levels at Putney rise and fall twice a day approx. 4.5m so riverbed works were scheduled for the 4 to 5 hours of low tide.
The ramp was divided into manageable sub sections which could be safely excavated and concrete poured within 2 hours, allowing a further 2 hours setting time.
In Battersea, the Barhale team were able to draw upon their wealth of tunnelling experience, to develop innovative solutions to mitigate un-foreseen changes to the scope of works. Their proactive approach to potential problems saved the client time and money in delivering a very tight programme.
Following the excavation of the reception cofferdam; designed to enable retrieval of the tunnelling boring machine (TBM), it was established that the existing sewer was not in the location shown on the drawings. Also, the area surrounding the sewer was overlaid by a dense zone of utility services including an Extra High Voltage (EHV) trough and large diameter portable water mains; consequently it was no longer possible to retrieve the tunnel boring machine from the cofferdam.
As part of Southern Water’s £1.8 billion AMP 5 programme, Barhale undertook a £12m design and construct upgrade to Ashford Treatment Wastewater Works, enhancing capacity to allow for population growth in the area under our Barhale Trant Utilities (BTU) JV.
Through our corporate design and construction procedures, Barhale, working in collaboration with our design delivery partner URS and Southern Water, established a series of design workshops to ascertain the exact objectives and milestones the project would need to deliver. The challenges that all project stakeholders faced on the Ashford project was the limited as built design and assets information for the existing site.
As part of Anglian Water’s Integrated Operational Solutions (IOS)
programme Barhale restored the iconic Chatterton Water Tower in
Spalding, Lincolnshire.
Located in the centre of town, the Water Tower holds up to 3.4 million
litres of fresh water, providing drinking water and essential pressure
to over 22,000 properties in Spalding and the surrounding rural
locations.
Officially opened by The Marquess of Exeter in 1955, the structure is
a local landmark within the town of Spalding and is visible for miles
around. It has therefore been essential that work on this high profile
structure is carried out sensitively and to the highest standards, with a
view to restore the town’s centre piece to its former glory.
To meet London’s ever growing transport needs, LUL carried
out a major upgrade of Bond Street Station. More than 155,000
passengers use the station daily. With that number expected to increase to 225,000 when Crossrail arrived in 2018.
The upgrade works were to reduce congestion and delays at the station, open a new station entrance, provide step-free access and integrate access to Crossrail services.
To enable LUL to deliver the full programme of works safely,
several critical water mains needed to be protected from potential
settlement, which could arise from the Crossrail tunnelling operations
and the associated station upgrade.