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COVER

COVER. Restoration of the. Queen’s Royal College. Maraval Road, Port of Spain. PARTIES INVOLVED 1. CLIENT. PROJECT DESIGN/CONSTRUCTION SUPERVISION TEAM. Architect. Bernard Mackay Architect. Project Manager. Prime Project Managers LTD. Conservation Consultants (architecture).

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COVER

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  1. COVER Restoration of the Queen’s Royal College Maraval Road, Port of Spain

  2. PARTIES INVOLVED1 CLIENT PROJECT DESIGN/CONSTRUCTION SUPERVISION TEAM Architect Bernard Mackay Architect Project Manager Prime Project Managers LTD. Conservation Consultants (architecture) Donald Insall Associates LTD. Civil and Structural Engineer C.E.P. LTD. Conservation Consultants (structural) Gifford and Partners LTD. Quantity Surveyor Ellis and Associates LTD. Services Engineer ENCO (Engineers Consultants) PARTIES INVOLVED The Ministry of Works and Transport for the Government of the Republic of Trinidad and Tobago Lead Consultants (In Association) Sub-Consultants

  3. CONSTRUCTION TEAM Kee- Chanona Ltd. Conservation Electrical Plumbing Air Conditioning Evergreene Studios Inc and CRMS Ltd. United Electrics Ltd Haynes Plumbing Ltd Clamens and Associates Ltd. Roofing Painting Stencil Cintec Anchors Clock Pest Control Property Care Ltd, LifetimeRoofing Ltd Larry Fulchan Evergreene Studios Inc; A&S Associates Ltd Core Solutions Ltd Smith of Derby Rentokil, Trinidad Pest Control PARTIESINVOLVED1 Main Contractor Sub-Contractors

  4. INTRODUCTION2 INTRODUCTION SIGNIFICANCE OF Q.R.C. • Main block – iconic status • Structural Design: Robust masonry, timber to floors and roof framing • Architectural Design: W. Wrightson – D.M.Hahn • King Edward Memorial Clock – 1913 eight day Westminister, full quarter chime – 5 bells

  5. INTRODUCTION2 INTRODUCTION OUR BRIEF • Make Main Block suitable for modern educational needs • Improved administrative facilities • Bring Assembly Hall back into use • Remove insensitive alterations over last 100 years • Improved working environment with modern services • Access for the physically challenged • Restore Q.R.C. as icon of Port of Spain and of elite educational establishment

  6. INTRODUCTION2 INTRODUCTION RESTORATION APPROACH - EXISTING STRUCTURES • Conserve existing original building elements • Restore, not replace • Matching materials

  7. INTRODUCTION2 INTRODUCTION RESTORATION APPROACH – ALTERATIONS AND IMPROVEMENTS • New facilities to enable Q.R.C. to remain as one of Trinidad and Tobago’s leading schools • Contemporary Intervention • Sympathetic materials and details

  8. MEASURED SURVEY 3 MEASURED SURVEY & DILAPIDATION SURVEY EXTERIOR • No full survey of Q.R.C. in existence • Building Measured in full externally

  9. MEASURED SURVEY 3 MEASURED SURVEY & DILAPIDATION SURVEY INTERIOR DETAILS

  10. PRE - CONDITION OF THE BUILDING4 CURRENT STATUS OF THE BUILDING OVERVIEW Behind the walls of this prestigious institution was a sorry tale of neglect, decay and vandalism.

  11. DILAPIDATION SURVEY4 MEASURED SURVEY & DILAPIDATION SURVEY THE ISSUES Broken and loose slates Lack of maintenance Roof Non matching Slates Walls Floors Ceilings External render Ironmongery Cast Iron Joinery Glazing Decorative plaster work Pigeons Modern services Human intervention

  12. DILAPIDATION SURVEY4 MEASURED SURVEY & DILAPIDATION SURVEY THE ISSUES Roof Walls Building movement Floors Ceilings External render Ironmongery Cast Iron Joinery Glazing Decorative plaster work Pigeons Modern services Human intervention

  13. DILAPIDATION SURVEY4 MEASURED SURVEY & DILAPIDATION SURVEY THE ISSUES Roof Structural walls Termite infestation – Decayed wood Floors Water penetration - Screed breaking up - Rotten timber floors Ceilings External render Ironmongery Cast Iron Joinery Glazing Decorative plaster work Pigeons Modern services Human intervention

  14. DILAPIDATION SURVEY4 MEASURED SURVEY & DILAPIDATION SURVEY THE ISSUES Roof Structural walls Floors Water penetration – Separation of Render and Decorative finish Termite infestation – Rotten Wood – Rotten Wood Ceilings External render Ironmongery Cast Iron Joinery Glazing Decorative plaster work Pigeons Modern services Human intervention

  15. DILAPIDATION SURVEY4 MEASURED SURVEY & DILAPIDATION SURVEY THE ISSUES Roof Structural walls Floors Ceilings External render Water penetration leading to: Peeling of paint and surface powdering Ironmongery Loss of whole sections Delamination and decay of surfaces Cast Iron Joinery Glazing Decorative plaster work Pigeons Modern services Human intervention

  16. DILAPIDATION SURVEY4 MEASURED SURVEY & DILAPIDATION SURVEY THE ISSUES Roof Structural walls Floors Ceilings External render Ironmongery Original fine brassware Cast Iron Insensitively replaced Bent Broken Joinery Glazing Decorative plaster work Pigeons Modern services Human intervention

  17. DILAPIDATION SURVEY4 MEASURED SURVEY & DILAPIDATION SURVEY THE ISSUES Roof Structural walls Floors Ceilings External render Ironmongery Cast Iron Broken & missing elements Joinery Glazing Decorative plaster work Pigeons Modern services Human intervention

  18. DILAPIDATION SURVEY4 MEASURED SURVEY & DILAPIDATION SURVEY EXISTING PROBLEMS Roof Structural walls Floors Ceilings External render Ironmongery Cast Iron Joinery Missing sections Rotten wood Glazing Decorative plaster work Pigeons Modern services Human intervention

  19. DILAPIDATION SURVEY4 MEASURED SURVEY & DILAPIDATION SURVEY EXISTING PROBLEMS Roof Structural walls Floors Ceilings External render Ironmongery Cast Iron Joinery Glazing Broken & missing panes Non-matching replacement glass Decorative plaster work Pigeons Modern services Human intervention

  20. DILAPIDATION SURVEY4 MEASURED SURVEY & DILAPIDATION SURVEY EXISTING PROBLEMS Roof Structural walls Floors Ceilings External render Ironmongery Cast Iron Joinery Glazing Decorative plaster work Missing sections Water damaged Loose Sections Pigeons Modern services Human intervention

  21. DILAPIDATION SURVEY4 MEASURED SURVEY & DILAPIDATION SURVEY EXISTING PROBLEMS Roof Structural walls Floors Ceilings External render Ironmongery Cast Iron Joinery Glazing Decorative plaster work Pigeons Attic Hall Modern services Human intervention

  22. DILAPIDATION SURVEY4 MEASURED SURVEY & DILAPIDATION SURVEY EXISTING PROBLEMS Roof Structural walls Floors Ceilings External render Ironmongery Cast Iron Joinery Glazing Decorative plaster work Pigeons Modern services Electric cables Air Conditioning Electric boards Human intervention

  23. DILAPIDATION SURVEY4 MEASURED SURVEY & DILAPIDATION SURVEY EXISTING PROBLEMS Roof Structural walls Floors Ceilings External render Ironmongery Cast Iron Joinery Glazing Decorative plaster work Pigeons Modern Service Human intervention Poor repairs Vandalism

  24. DILAPIDATION SURVEY4 MEASURED SURVEY & DILAPIDATION SURVEY EXPONENTIAL DECAY April 2005 February 2004

  25. FIRST AID WORKS5 FIRST AID WORKS ROOF REPAIRS • Prevent further water penetration • Arrest decay of internal finishes

  26. SPECIFYING REPAIRS6 MEASURED SURVEY & DILAPIDATION SURVEY MATERIALS • Take samples • Analyse • Match existing materials • Specify repair works

  27. SPECIFYING REPAIRS6 MEASURED SURVEY & DILAPIDATION SURVEY DRAWINGS • Annotated drawings • Inventory of all the problems in the building

  28. RESTORATION OF EXISTING STRUCTURE7 REPAIRS Structure Roof Cast iron elements Timber ceilings Joinery Plaster Moulding – Assembly Hall Internal redecoration Clock Structural modifications with limited visible alteration to the building

  29. RESTORATION OF EXISTING STRUCTURE7 STRUCTURAL WORKS CEP TEAM & ACKNOWLEDGMENTS • Kerrin Burgess & Danny Chin Structural Engineers who worked on QRC but left CEP Ltd. before project completion • Richard Swift ( formerly Gifford, now Ramboll) and Francis Maude (Donald Insall Associates)

  30. RESTORATION OF EXISTING STRUCTURE7 FIRST AID WORKS STRUCTURAL WORKS AREAS OF WORK • Dilapidation Survey/Condition Assessment identified structural defects. • Assessment of existing structural elements • Visual Assessment of structural elements • Testing: Non destructive tests and load tests • structural modelling & details of remedial works • Seismic Strengthening

  31. RESTORATION OF EXISTING STRUCTURE7 FIRST AID WORKS STRUCTURAL WORKS AREAS OF WORK • Repair to damage caused by construction activity • Design of new structural elements to be constructed within building and carry out assessment of existing support conditions

  32. RESTORATION OF EXISTING STRUCTURE7 STRUCTURAL WORKS STRUCTURAL SYSTEM • Structure is an unreinforced masonry bearing wall system (both stone masonry and stone/mortar mix) supported on shallow foundations. • There are arched unreinforced concrete floors along the corridors, verandas • Timber joists and floor boards in classrooms at first floor level. Timber trusses support ceiling joists, purlins, rafters, and slates at roof level

  33. RESTORATION OF EXISTING STRUCTURE7 STRUCTURAL WORKS STRUCTURAL SYSTEM Masonry Bearing Wall System • Lateral loads are transferred via the floor diaphragm to the walls, which in turn carry loads to the foundation. • Does not resist lateral loads by ductility, as does most modern buildings, highly dependent on the robustness of the system

  34. RESTORATION OF EXISTING STRUCTURE7 FIRST AID WORKS STRUCTURAL WORKS STRUCTURAL SYSTEM Timber floors 56.1 m 23.4 m

  35. RESTORATION OF EXISTING STRUCTURE7 FIRST AID WORKS STRUCTURAL WORKS STRUCTURAL SYSTEM

  36. RESTORATION OF EXISTING STRUCTURE7 STRUCTURAL WORKS ROOF FRAMING

  37. RESTORATION OF EXISTING STRUCTURE7 STRUCTURAL WORKS TIMBER ELEMENTS • Timber Defects (decay, insect damage, splits). Extensive in wall plates, to a lesser extent in roof trusses • For timber elements, defects identified by visual inspection and use of Timber probe • Use of Non-destructive Test (NDT) Timber Probe (SIBTEC Digital Micro probe). • Very small diameter probe drilled into timber sections. • Changes of resistance gives measure of decay.

  38. RESTORATION OF EXISTING STRUCTURE7 FIRST AID WORKS STRUCTURAL WORKS SIBTEC TIMBER PROBE • Hand held equipment, easy to use www.sibtec.com

  39. RESTORATION OF EXISTING STRUCTURE7 STRUCTURAL WORKS STRUCTURAL ASSESSMENT OF TIMBER ELEMENTS • Based on site dimensions, the timber trusses were modelled in STAAD Pro. 2006 and checked to confirm adequacy for design loads. • Timber elements were modified by one of the following methods: • bolting additional timber sections to existing sections • bolting steel channels or steel plates to existing sections • replacement of entire sections ONLY where the loss of cross-sectional area was too extensive to allow for fixing (wall plates for example)

  40. RESTORATION OF EXISTING STRUCTURE7 STRUCTURAL WORKS NEW WALL PLATES TO SUPPORT DRAINS

  41. RESTORATION OF EXISTING STRUCTURE7 FIRST AID WORKS STRUCTURAL WORKS STRUCTURAL ASSESSMENT OF TIMBER ELEMENTS

  42. RESTORATION OF EXISTING STRUCTURE7 STRUCTURAL WORKS STRUCTURAL RETROFIT OF TRUSSES

  43. RESTORATION OF EXISTING STRUCTURE7 STRUCTURAL WORKS STRUCTURAL RETROFIT OF TRUSSES

  44. RESTORATION OF EXISTING STRUCTURE7 STRUCTURAL WORKS STRUCTURAL RETROFIT OF TRUSSES

  45. RESTORATION OF EXISTING STRUCTURE7 STRUCTURAL WORKS STRUCTURAL RETROFIT OF TRUSSES

  46. RESTORATION OF EXISTING STRUCTURE7 STRUCTURAL WORKS MASONRY & CONCRETE ELEMENTS • Stonework was found to be in good condition. • Cracks in masonry extensive due to material deterioration, settlement and poor drainage • Unlike traditional construction, material compatibility was a critical factor in selection of repair methods • vegetation growth contributed to deterioration of concrete in external walls

  47. RESTORATION OF EXISTING STRUCTURE7 STRUCTURAL WORKS MASONRY & CONCRETE ELEMENTS

  48. RESTORATION OF EXISTING STRUCTURE7 STRUCTURAL WORKS ENCASEMENT & UNDERPINNING • Foundation conditions were examined, encasement and enlargement required in some areas

  49. RESTORATION OF EXISTING STRUCTURE7 STRUCTURAL WORKS SEISMIC STRENGTHENING • Seismic Assessment by CEP Ltd • Expert Advice (Gifford) & engineering judgment • The following were considerations: • Past performance of building under earthquakes • Existing structural lateral system robust with relatively light weight roof and large areas of timber floors at first floor level • Discontinuous walls to be tied • “Stitching” of sections of wall with existing cracks

  50. RESTORATION OF EXISTING STRUCTURE7 STRUCTURAL WORKS SEISMIC STRENGTHENING CINTEC ANCHORS • Improve performance due to overall strengthening • Tie discontinuous walls/piers • Suitable for stitching sections of the structure with existing cracks • Strengthen corners

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