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Thoresby Lake Restoration Project - Earthworks & Demolition

Thorne Group leads the restoration of Thoresby Lake, involving earthworks, reclamation, and demolition to prevent subsidence. Project Scope: Enabling Works, North & South Shore Realignment, and Habitat Creation.

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Thoresby Lake Restoration Project - Earthworks & Demolition

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

  2. Project Overview • Enabling Works • South Shore • North Shore • Project Summary THORNE GROUP Earthworks : Recycling : Reclamation : Demolition : Dismantling THORESBY LAKE PHASE 1 • Thorne were appointed Principal Contractor for the Thoresby Lake Phase 1 project which was undertaken within the tranquil settings of Thoresby Estate. • 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 subsidence would lead to the lake bursting its banks and by-passing the man-made dam at the Eastern end. • 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.

  3. 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 • Enabling Works • South Shore • North Shore • Project Summary THORNE GROUP Earthworks : Recycling : Reclamation : Demolition : Dismantling THORESBY LAKE PHASE 1 N

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

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

  6. 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 THORNE GROUP Earthworks : Recycling : Reclamation : Demolition : Dismantling THORESBY LAKE PHASE 1

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

  8. 2nd 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 THORNE GROUP Earthworks : Recycling : Reclamation : Demolition : Dismantling THORESBY LAKE PHASE 1

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

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

  11. South Shore • North Shore • Project Summary • 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 THORNE GROUP Earthworks : Recycling : Reclamation : Demolition : Dismantling THORESBY LAKE PHASE 1

  12. South Shore • North Shore • Project Summary • 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 THORNE GROUP Earthworks : Recycling : Reclamation : Demolition : Dismantling THORESBY LAKE PHASE 1

  13. South Shore • North Shore • Project Summary • 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 THORNE GROUP Earthworks : Recycling : Reclamation : Demolition : Dismantling THORESBY LAKE PHASE 1

  14. South Shore • North Shore • Project Summary • Project Overview • Enabling Works • North Shore: Site Clearance • ~ 100 trees professionally felled • 15,000 m2 of vegetation cleared • 3,500 m2 of topsoil stripped • Reeds and bulrushes transplanted THORNE GROUP Earthworks : Recycling : Reclamation : Demolition : Dismantling THORESBY LAKE PHASE 1

  15. South Shore • North Shore • Project Summary • 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 THORNE GROUP Earthworks : Recycling : Reclamation : Demolition : Dismantling THORESBY LAKE PHASE 1

  16. South Shore • North Shore • Project Summary • 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 THORNE GROUP Earthworks : Recycling : Reclamation : Demolition : Dismantling THORESBY LAKE PHASE 1

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

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

  19. South Shore • North Shore • Project Summary • 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 32.75 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 THORNE GROUP Earthworks : Recycling : Reclamation : Demolition : Dismantling THORESBY LAKE PHASE 1

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