WET News

12 WET NEWS SEPTEMBER 2015 If you require further information on any of our products pl ease email enquiries@talis-group.com TALIS UK manufactures and supplies a comprehensive range of valves, hydrants and fittings from 16mm to 3600mm for up to 160 bar applications. We can offer a design and after sales service package. Please visit talis-uk.com for more information. Cost effective solutions from TALIS UK Your Choice in Waterflow Control Precise Engineering Complete Solutions www.talis-uk.com TALIS UK Rückgewinnung Pumpwerk Rohrnetze Wassergewinnung Speicher Bewässerung Talsperre Aufbereitung Industrie Kraftwerk Klärwerk Gas Rückgewinnung Pumpwerk Rohrnetze Wassergewinnung Speicher Bewässerung Talsperre Aufbereitung Industrie Kraftwerk Klärwerk Gas Rückgewinnung Pumpwerk Rohrnetze Wassergewinnung Speicher Bewässerung Talsperre Aufbereitung Industrie Kraftwerk Klärwerk Gas Rückgewinnung Pumpwerk Rohrnetze Wassergewinnung Speicher Bewässerung Talsperre Aufbereitung Industrie Kraftwerk Klärwerk Gas Rückgewinnung Pumpwerk Rohrnetze Wassergewinnung Speicher Bewässerung Talsperre Aufbereitung Industrie Kraftwerk Klärwerk Gas Rückgewinnung Pumpwerk Rohrnetze Wassergewinnung Talsperre Aufbereitung Industrie Klärwerk Gas @TalisUK Easi-Base makes it easier Precast Concrete Solutions fpmccann.co.uk/drainage | precast@fpmccann.co.uk Easi-Base addresses a long-standing problem associated with traditional methods of manhole construction. Labour intensive, in-situ practices typically taking up to 36 hours are eliminated by the fully integrated unit which can be installed and connected in a matter of minutes. The DN 1200 precast concrete base complete with channels and benching formed into a polypropylene liner is placed on a formation comprising compacted granular material. Pipe connection is made simple with connection bells cast into the base for the specific pipe in use. DN 1500 and DN 1800 Easi-Bases are manufactured wholly from concrete and can accommodate concrete, clay, twin-wall and uPVC pipes from DN 300 to DN 750. A prefabricated manhole base unit with integral benching, channels and connectors that provides an immediate and long-lasting watertight solution in the management of waste water. NI Precast Office 16-18 Quarry Road Magherafelt BT45 8NR 028 7954 9026 Ellistown Depot Whitehill Road Ellistown Leicestershire LE67 1ET 01530 240000 within a rising main of up to 3.5 bar. Due to major corrosion of the rising main at the wet well and to enable the liner to be installed, both a 45o bend and a 17½o bend had to be removed from within the cliff. To enable this work a 1.2m square and 2m long timber heading was driven into the cliff face from the side of the brick wet well chamber. This also allowed an access platform to be erected in the bottom of the wet well. Lining was achieved from within the wet well. The liner, being a composite twin-wall liner, was not inverted into the host pipe but winched through. It was then inflated and steam cured. On completion, the timber heading was backfilled with concrete and voids surrounding the timber heading grouted. Following a routine CCTV survey, a 600mm diameter concrete surface water sewer pipe, running beneath a Victorian property in St Pauls Road, Salisbury and underneath a number of rear gardens locally, was identified as having collapsed over a length of some 60m. During construction of the properties in the area, a local river was placed into a culvert over a length of some 93m and using a further three brick culverts the river was transferred underneath the local railway line before entering a nearby river. The ground over the culvert was made up to a depth of 2.4m over the existing river bed. The CCTV survey, however, Underpinning works were required to stabilise the property in Salisbury before renovation works could be completed The massive underpinning works are completed in the St Paul's Road property to allow installation of the new lightweight pipe revealed that the concrete pipe covering part of the diverted river course had fractured in a classic '4-point' collapse and the invert of the pipe had risen to the centreline. Whilst flow was still occurring through the pipe it was obvious that structure was close to full collapse and was in need of urgent renovation, with a trenchless solution being preferable due to the location adjacent to the old Victorian properties. To utilise more traditional techniques would have required a diversion route that would have included laying 110m of 600mm diameter surface water sewer using open-cut techniques at 2.5m deep in the adjacent highway, installing four new manholes, underpinning 8m of the property wall and utilising some 40m of sheet pile retaining wall. The construction cost to undertake this diversion would be approximately £450,000. Various trenchless options were also investigated including pipe-bursting but this was ruled out due to the forces required and the potential for foundation movement beneath the buildings. The project was further complicated by the fact that the damaged pipe was just 2.4m beneath a property. There was also an idea to slip line a smaller pipe through the 600mm diameter concrete pipe but due to the host pipe's deteriorated condition and the hydraulic constraints of the surface water sewer this too

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