Forkers Limited Civil And Ground Engineering
 
 


Water, Sewerage & Main Drainage

Forkers has been undertaking main drainage and sewerage schemes for the water industry, local authorities and private clients for over 30 years. Our in depth experience in this field covers a complete range of drainage solutions, construction techniques, ground conditions and contract values and also includes design and construct schemes. The company is currently a framework sewerage contractor for Severn Trent Water for its AMP4 capital investment programme.
Culverted river diversion
Supported excavation for foul sewer detention tank

Our capability includes:
  • Pipes & Gravity Sewers (to 2.4m dia) in concrete, clay, GRP, plastic and corrugated steel, and pre-cast Culverts (to 6.0m x 3.6m) in open cut trench, depths up to 18m and scheme lengths to 3.6 km
  • Use of specialist trench support techniques including large drag boxes, sliding panel systems, sheet piling, cofferdams and ‘Rollshor’ one pass deep trenching equipment
  • Pipelines & Rising Mains including schemes of over 6km of 280mm MDPE main installed using open cut, ‘trencher’ and directional drilling techniques
  • Manholes in pc rings, in-situ concrete or brickwork
  • Shaft Sinking by caisson or underpinning techniques using bolted segmental, smooth bore or caisson rings. Shafts for storage tanks or pumping stations up to 15m dia and 25m deep
  • In-situ reinforced concrete Detention Tanks to 6500m3 storage capacity in piled or battered excavation
  • Pumping Stations in shaft tanks or detention tanks and installation of  package plants
  • Screened Overflow Chambers (CSO’s) with mechanical or static screens for solving UID problems
  • Flood relief schemes and urban re-sewerage projects
  • Section 101A first time sewerage schemes
  • M & E installations including pumps, panels, kiosks, screens, power supplies and telemetry
  • Balancing Ponds and flow control structures for SUD’s drainage solutions including placement of impermeable liners
  • Interceptors for protection of consented discharges
  • Pipe Jacking to 2.1m dia using mechanised excavator shields or use of specialist full face microtunnelling equipment
  • Tunnelling to 2.7m dia & Timber Headings to 2.0m sq
  •  Use of ‘No Dig’ Techniques including Directional Drilling and Auger Boring
  • Dig Down Repair, Sewer Re-lining & Renovation including use of cured in place resin linings
  • Sewage Treatment schemes such as RBC Units and reed beds
  • Sewer & Culvert Grouting for sewer abandonment
Shaft tank pumping station
On-line tank sewer in open cut trench
The company’s AMP 4 framework sewerage contract with Severn Trent Water (2005—2010) follows our successful AMP 3 framework (2000 – 2005). It is a partnering contract enabling Severn Trent to benefit from the company’s experience and expertise, develop options and alternatives, assess buildability and identify best value solutions.

To identify the workload involved, during AMP 3 and AMP 4 we have constructed 40 no shaft tank pumping stations, over 600m of shaft up to 15m dia and 25 m deep, 30 km of rising main, 4 no in situ detention tanks up to 4,500m3 storage capacity, 50 km of sewers in open cut up to 2.1m dia, 1200m of pipejack to 2.1m dia, 600m of pre-cast concrete culverts up to 3m high x 4m wide, 30 CSO chambers with static and mechanical screens, 10 section 101A schemes, 1000m of sewer relining, various small works – cellar pumps, dig down repairs & emergency sewer repairs as well as completing the site investigation work associated with all schemes.

The contract is valued at up to £12.5m annually with up to 25 individual schemes carried out from £50k to £3.0m each year. A key requirement is that the contractor undertakes the programme management of all schemes within the full 5 year programme, incorporating information from the client, designers and third parties, enabling efficient management of resources and key suppliers as well as providing a consistent workload.

Project management of all schemes also includes a comprehensive Risk Management process as well as the use of a bespoke Key Performance Measures review procedure.

Due to the urban location of many of these schemes, the impact on the public and on traffic can be significant. We adopt a high profile customer care strategy on all sites to foster the cooperation of the public, identify and mitigate impacts where possible, provide continuously updated information, undertake regular contact and liaison and obtain post contract feedback from the public on our performance.
2.1m diameter pipejack for tank sewer
Dual foul and surface water sewers in open cut trench

Our portfolio of work in the water sector also includes River, Canal and Watercourse Improvement schemes. Reconstruction and protection projects to rivers, watercourses and canals have involved sheet piling, capping beams,  gabions & revetments, channel cleaning & re-grading, de-silting, outfalls, overflows & balancing ponds, weirs & flow control structures, listed bridge reconstruction, high quality brickwork, stonework and in situ concrete construction, footpaths,  moorings and other amenity improvements.
Sheet piling for river bank improvements
Urban brook course bypass and overflow structure

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Forkers Limited
Registered in England No 1073245
Mini-Piling & Drilling
Company Ltd
Registered in England No 5706455

Registered Address: Golds Green House, Shaw Street, West Bromwich, West Midlands B70 0TX
Tel: 0121 505 1010 Fax: 0121 505 1026
e-mail: admin@forkers.com Web: www.forkers.com