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Deep Residential Basement, Chelsea PowerPoint Presentation
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Deep Residential Basement, Chelsea

Deep Residential Basement, Chelsea

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Deep Residential Basement, Chelsea

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  1. Deep Residential Basement, Chelsea

  2. Toureen Plant Toureen Contractors City Basements Groundworks RC Frames Petrol Filling Station Refurbishment Decommissioning Demolition

  3. The Scope • Create a 585m2 basement around a Grade II listed Victoria Villa utilising the entire footprint of the plot including front, side and rear garden • To maximize internal space the basement is to be built partially under and around a tree protected under a tree preservation order Basement Plan

  4. The Scope To accommodate a swimming pool within the basement and allow for the garden to be reinstated above, the basement was up to 8.5m deep The deeper parts of the basement are to be formed in water bearing River Terrace Gravels

  5. The Challenges • The site is in a prime West London residential neighbourhood sensitive to construction traffic • The semi detached property shares boundaries with another semi detached villa, a school and a mews house to the rear. The semi detached villa adjacent being particularly sensitive to • movement/deflections

  6. The Challenges • Maximise internal space in the basement • The basement had to be formed below and • around a tree root protection zone. The • TRPZ could not be compromised or the • roots damaged

  7. The Challenges • Managing or excluding ground water from the excavation • Offload and distribute materials around an irregular site • Overlap construction of basement with refurbishment of existing property • Tight programme and good value

  8. The Solutions Traffic management • Purpose built gantry

  9. The Solutions Traffic management • Made use of permanent works

  10. The Solutions Traffic management • Designed to allow spoil removal, • concrete pumping and lifting of plant

  11. The Solutions Retaining Walls • Limit deflections by using propped Larrson sheet piles • Increase space in the basement by using sheet piles over secant • piled wall. Incorporate sheet piles into permanent works to reduce • thickness of wall. • Use of Larrsen sheet piles over zero piles to reduce propping • requirements and limit deflection

  12. The Solutions Retaining Walls

  13. The Solutions Retaining Walls • Silent and vibration less • piling with minimum water • jetting • Temporary frame cut and • installed to suit on site • dimensions

  14. The Solutions Retaining Walls • Existing house piled to limit • settlement • Contiguous retaining walls • installed from inside of house

  15. Results of movement monitoring m m

  16. m

  17. The Solutions Retaining Walls • Install sheet piles outside boundary and extract.

  18. The Solutions Tree Protection Zone • Limit disturbance in TRPZ

  19. The Solutions Tree Protection Zone • Work in progress

  20. The Solutions Tree Protection Zone • Offer better value with micro piles

  21. The Solutions Tree Protection Zone • Reduce plant size and • space requirements

  22. The Solutions Tree Protection Zone • Make use of permanent work piles • as king posts

  23. The Solutions Managing Groundwater • Appreciating the problem

  24. The Solutions Managing Groundwater

  25. The Solutions Managing Groundwater

  26. The Solutions Managing Groundwater • Forming cut off walls to stem water • flow

  27. The Solutions Managing Groundwater • Deep drainage sumps

  28. The Solutions Managing Groundwater • Pumping and disposal

  29. The Solutions Programme • Top down vr bottom up

  30. The Solutions Programme • Tower Crane

  31. The Solutions Programme • Removal of soil

  32. The Solutions Programme • Removal of spoil

  33. The Solutions Programme • Working inside and • outside the property • simultaneously

  34. The Solutions Programme • Support of front portico and rear • extension on temporary piles

  35. Summary • Sequence of works allows work inside and outside of property • simultaneously • Choice of retaining walls, temporary works, tower crane and gantry • improve safety, efficiency and productivity • Bottom up approach allows better access, logistics and working • conditions • Alternative temporary works around TRPZ • Shorter programme lead to better value

  36. Summary • Quality work executed by skilled • operatives and tradesmen