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Tender Details
- Country: United Kingdom
- Summary: Nrv Culverts Nm Corner
- GBT Ref No: 104980400
- Deadline: 15 Aug 2024
- Competition: ICB
- Financier: Self Financed
- Purchaser Ownership: Public
- Tender Value: 33000
- Notice Type: Tender
- Document Ref. No.: NE300724NRVCNMC
- Purchaser's Detail :
- Description :
- Description of Works
Refer to attachment: Natural England Specifications of Requirements - NRV Culverts NM Corner
Replace three existing 450mm culverts fitted and non-return valves (flap valves) previously installed in the 1990s. Non-return valves were fitted to act as a water supply into the North Moor Corner Raised Water Level area when water levels within internal ditches are lower than external levels. Structures to allow passage of water into the raised water level area, but in an emergency can also be opened to allow evacuation of water during flood events.
The wooden headwalls of the culverts are severely degraded and in places material compacted around the culvert pipes has collapsed into the field and ditch. Replacement structures are required.
Each replacement culvert must be/have:
• Rigid twin-walled plastic pipe
• Internal pipe diameter 450mm
• Pipe length 6000mm
• Culvert pipe surround of geotextile membrane and clean, crushed, locally sourced stone
• Motorway barrier headwalls with 450mm non-return (flap) valve (vertical component of headwall required to reach approximate depth of 3500mm to anchor the structure to the clay bed beneath the peat soils)
• 12-foot metal gate with galvanised metal gate posts and wooden wings
Working Method will follow: Somerset IDB Gateway Construction Culvert Sequence Guide - utilising Steel Motorway Barrier Headwalls
Working area must be isolated with sheet piling and drained prior to commenceme... - Documents :
Purchaser : NATURAL ENGLAND
Natural England Avalon Marshes Centre Westhay BA6 9TT England
Contact Person : Philip Thorpe
Email :philip.thorpe@naturalengland.org.uk
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