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THORNE GROUP Earthworks : Recycling : Reclamation : Demolition : Dismantling THORESBY LAKE PHASE 1 PRE-SUBSIDENCE WORKS Client: UK COALConsultant: Black.

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Presentation on theme: "THORNE GROUP Earthworks : Recycling : Reclamation : Demolition : Dismantling THORESBY LAKE PHASE 1 PRE-SUBSIDENCE WORKS Client: UK COALConsultant: Black."— Presentation transcript:

1 THORNE GROUP Earthworks : Recycling : Reclamation : Demolition : Dismantling THORESBY LAKE PHASE 1 PRE-SUBSIDENCE WORKS Client: UK COALConsultant: Black & Veatch

2 THORNE GROUP THORESBY LAKE PHASE 1 Project Overview Earthworks : Recycling : Reclamation : Demolition : Dismantling Thorne were appointed Principal Contractor for the Thoresby Lake Phase 1 project which was undertaken within the tranquil settings of Thoresby Estate. The subsidence would lead to the lake bursting its banks and by-passing the man- made dam at the Eastern end. The Client, UK COAL, intended to open new coal workings beneath the lake which would subsequently be affected by up to 900mm of subsidence. The aim of the project was to raise and reprofile the Northern and Southern shores of the lake prior to the subsidence occurring. Located within the historic Thoresby Estate and a Grade 1 listed deer park, the site was under the close scrutiny of the Estate Trustees, English Heritage, English Nature, the Environment Agency & Hotel (located within Thoresby Hall) and was also designated as a SSSI. Close consultation between the interested parties and sympathetic project management were required to achieve a swift and efficient completion to the works on behalf of the Client. Enabling Works South Shore North Shore Project Summary

3 THORNE GROUP THORESBY LAKE PHASE 1 Earthworks : Recycling : Reclamation : Demolition : Dismantling Project Overview The project consisted of 3 elements: 1, Enabling works to allow construction access 2, South shore works – realignment, raising and bank reinforcement 3, North shore works – realignment, raising and natural habitat creation N Enabling Works South Shore North Shore Project Summary

4 THORNE GROUP THORESBY LAKE PHASE 1 Earthworks : Recycling : Reclamation : Demolition : Dismantling Site entrance set up & 400m track installed to compound location South Shore Project Overview Enabling Works North Shore Project Summary

5 THORNE GROUP THORESBY LAKE PHASE 1 Earthworks : Recycling : Reclamation : Demolition : Dismantling Access to the Northern shore and Lake Outfall 1 installed South Shore Project Overview Enabling Works North Shore Project Summary

6 THORNE GROUP THORESBY LAKE PHASE 1 Earthworks : Recycling : Reclamation : Demolition : Dismantling Temporary bridge, including foundations installed for access to the dam A 24m, 45t rated, construction bridge, requiring a 100t crane for installation South Shore Project Overview Enabling Works North Shore Project Summary

7 THORNE GROUP THORESBY LAKE PHASE 1 Earthworks : Recycling : Reclamation : Demolition : Dismantling Access track constructed on the dam South Shore Project Overview Enabling Works North Shore Project Summary

8 THORNE GROUP THORESBY LAKE PHASE 1 Earthworks : Recycling : Reclamation : Demolition : Dismantling 2 nd Temporary bridge installed for access across lake outfall 2 A 13m, 45t rated, construction bridge, requiring a 100t crane for installation South Shore Project Overview Enabling Works North Shore Project Summary

9 THORNE GROUP THORESBY LAKE PHASE 1 South Shore Earthworks : Recycling : Reclamation : Demolition : Dismantling Project Overview Enabling Works Access from bridge to South shore working area installed Safety fencing and site signage installed North Shore Project Summary

10 THORNE GROUP THORESBY LAKE PHASE 1 South Shore North Shore Project Summary Earthworks : Recycling : Reclamation : Demolition : Dismantling Project Overview Enabling Works South Shore: Site Clearance Approximately 20 trees professionally felled Listed Monument removed for renovation Topsoil stripped prior to realignment

11 THORNE GROUP THORESBY LAKE PHASE 1 South Shore North Shore Project Summary Earthworks : Recycling : Reclamation : Demolition : Dismantling Project Overview Enabling Works South Shore: Realignment Chainage 0 to 160 m Bank cut to 1:6 gradient Cut transported to fill area Erosion protection placed Topsoil reinstated

12 THORNE GROUP THORESBY LAKE PHASE 1 South Shore North Shore Project Summary Earthworks : Recycling : Reclamation : Demolition : Dismantling Project Overview Enabling Works South Shore: Realignment Chainage 160 to 400 m New bank alignment cut Bank cut to 1:2.5 gradient Cut placed in fill areas and banks raised Profile for armourstone installation cut

13 THORNE GROUP THORESBY LAKE PHASE 1 South Shore North Shore Project Summary Earthworks : Recycling : Reclamation : Demolition : Dismantling Project Overview Enabling Works South Shore: Realignment Chainage 160 to 400 m New island and channel formed Sub-armourstone geotextile installed Armourstone erosion protection installed Island topsoil applied Topsoil reinstated and seeded Accesses tidied and temporary crossings removed

14 THORNE GROUP THORESBY LAKE PHASE 1 South Shore North Shore Project Summary Earthworks : Recycling : Reclamation : Demolition : Dismantling Project Overview Enabling Works North Shore: Site Clearance ~ 100 trees professionally felled 15,000 m 2 of vegetation cleared 3,500 m 2 of topsoil stripped Reeds and bulrushes transplanted

15 THORNE GROUP THORESBY LAKE PHASE 1 South Shore North Shore Project Summary Earthworks : Recycling : Reclamation : Demolition : Dismantling Project Overview Enabling Works North Shore: Realignment Colliery shale front line bank removed Small flooding protection bank left in situ Lake bed formed behind original bank New shoreline bund formed

16 THORNE GROUP THORESBY LAKE PHASE 1 South Shore North Shore Project Summary Earthworks : Recycling : Reclamation : Demolition : Dismantling Project Overview Enabling Works North Shore: Finishing Works Natural habitats created Boat launch excavated and shuttered Boat launch cast and married-in to bund Flooding protection bank removed

17 THORNE GROUP THORESBY LAKE PHASE 1 South Shore North Shore Project Summary Earthworks : Recycling : Reclamation : Demolition : Dismantling Project Overview Enabling Works Project Summary: The Finished Product South Shore: Water level raised, pre-subsidence

18 THORNE GROUP THORESBY LAKE PHASE 1 South Shore North Shore Project Summary Earthworks : Recycling : Reclamation : Demolition : Dismantling Project Overview Enabling Works Project Summary: The Finished Product North Shore: Water level raised, post-subsidence

19 THORNE GROUP THORESBY LAKE PHASE 1 South Shore North Shore Project Summary Earthworks : Recycling : Reclamation : Demolition : Dismantling Project Overview Enabling Works Project Summary: Analysis A score of ZERO Heath & Safety incidents recorded A score of ZERO Environmental incidents recorded A Considerate Constructors Scheme score of achieved A post-completion Client satisfaction survey score of 98% Works completed in advance of the of the mining subsidence Works completed 2 weeks AHEAD of the 17 week programme Final cost of the works to the Client at 4% UNDER BUDGET


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