Published on

  • Be the first to comment

  • Be the first to like this

No Downloads
Total views
On SlideShare
From Embeds
Number of Embeds
Embeds 0
No embeds

No notes for slide


  1. 1. Stress Free Structural Solutions Harbour Views, Gibraltar Brick Façade Stabilisation Presentation 27 th November 2001
  2. 2. Presenter <ul><li>Eur Ing Tony Sagoo BSc MBA CEng MICE Director, Consultancy Operations </li></ul><ul><ul><li>Managed project from pre-contract stage onwards </li></ul></ul><ul><ul><li>Worked closely with Mark Creighton of Pitchmastic </li></ul></ul>
  3. 3. Presentation agenda <ul><li>About 30 minutes long </li></ul><ul><ul><li>Introduction to Helifix </li></ul></ul><ul><ul><li>Overview of Helibeam System </li></ul></ul><ul><ul><li>Brief highlights of Harbour Views contract </li></ul></ul>
  4. 4. Helifix <ul><li>A manufacturer of innovative construction products, primarily for new-build and remedial repair masonry applications </li></ul><ul><li>Supports products by providing technical solutions </li></ul><ul><li>Head office and factory based in the UK, with a sister company in North America and agencies around the world </li></ul>
  5. 5. Helifix’s philosophy <ul><li>Development of alternative sympathetic technical repair strategies </li></ul><ul><li>Structural Function + Flexibility </li></ul><ul><li>Minimal physical and aesthetic damage to structure through innovative repair techniques </li></ul>“ Small & distributed” versus “large & concentrated”
  6. 6. Helibeam System - characteristics <ul><li>Flexible, high yield austenitic stainless steel </li></ul><ul><li>Unique HeliBar “hi-fin” profile </li></ul><ul><li>High strength, high bond cementitious grout and resins </li></ul><ul><li>Grout and resins pre-packaged to ensure correct mix ratio </li></ul><ul><li>No form of expansion with the repair system – “stress free” </li></ul>
  7. 7. Helibeam System - installation <ul><li>Introduces ductility & tensile capacity within masonry – to prevent/mitigate cracking and enhance strength </li></ul><ul><li>Acts compositely with the building materials to accommodate normal movement </li></ul><ul><li>Excellent load transfer capabilities </li></ul><ul><li>Quicker and simpler to install in comparison with more traditional repairs </li></ul><ul><li>Cost effective alternative to traditional repairs </li></ul><ul><li>Excellent quality control of site installations </li></ul>
  8. 8. Helibeam System - benefits <ul><li>The Helibeam System provides highly adaptable engineered masonry repair solutions, that are quicker, quality controlled and more cost effective to install than traditional repair methods </li></ul>
  9. 9. What can Helifix do for you? <ul><li>Technical Support </li></ul><ul><li>Repair Solutions </li></ul><ul><li>Engineering Calculations </li></ul><ul><li>CAD Drawings </li></ul><ul><li>Approved Installers </li></ul><ul><li>Warranties </li></ul>Total Solution Packages
  10. 10. Harbour Views Project
  11. 11. Façade defects <ul><li>Structural cracking of outer leaf brickwork </li></ul><ul><li>Inadequate lateral design capacity of wall panels under wind pressure/suction </li></ul><ul><li>Unstable brick slips </li></ul><ul><li>Distortion of façades </li></ul>
  12. 12. Principal causes of defects <ul><li>Brick expansion </li></ul><ul><li>Concrete frame shrinkage </li></ul><ul><li>Lack of movement joints </li></ul><ul><li>Thermal/moisture effects </li></ul><ul><li>Differential movement </li></ul><ul><li>Construction defects </li></ul>
  13. 13. Original proposals <ul><li>Basically traditional repair approach </li></ul><ul><li>Metal plates bolted/bonded across cracks </li></ul><ul><li>Windposts to strengthen wall panels </li></ul><ul><li>Shelf angles to support brick overhangs </li></ul><ul><li>Removal/rebuild of masonry </li></ul>
  14. 14. Original proposals - problems <ul><li>Technically inappropriate? (personal view!) </li></ul><ul><li>Not a “System” approach to the buildings overall </li></ul><ul><li>Rigid plates/fixings – no flexibility </li></ul><ul><li>Vulnerable galvanizing coating to mild steel </li></ul><ul><li>Considerable obstructions to overcladding </li></ul><ul><li>Very labour intensive and slow to install </li></ul><ul><li>Could not be accurately costed – prohibitive in reality </li></ul>
  15. 15. Helifix’s proposals <ul><li>Defects viewed on a global and local basis as an engineered “System” approach </li></ul><ul><li>Proposals designed to introduce/retain flexibility </li></ul><ul><li>All steelwork is stainless grade 304 or 316 </li></ul><ul><li>No obstruction of the overcladding system </li></ul><ul><li>Simple and quick to install by trained operatives </li></ul><ul><li>Costings could be accurately calculated & fixed </li></ul><ul><li>Considerable positive “knock-on” effects </li></ul>
  16. 16. Original proposals - straps Metal corner strap plate – design details
  17. 17. Original proposals - straps Metal corner strap plate – bolted and bonded to wall
  18. 18. Helifix proposals - CrackStitch Helifix CrackStitch bars installed around a cracked corner
  19. 19. Original proposals – ties Column tie details
  20. 20. Original proposals – ties Installed column ties
  21. 21. Helibeam System proposals Typical CAD drawing of a wall panel design proposal
  22. 22. Helibeam System proposals Typical computer calculation for wall design verification
  23. 23. Helibeam System proposals Bedjoint slots being cut for installation of Helibeams
  24. 24. Helibeam System proposals Completed Helibeams
  25. 25. Loose brick slips Area of removed brick slips
  26. 26. Original proposals – shelf angles Original angle support proposal
  27. 27. Original proposals – shelf angles Installed “shelf” support angles
  28. 28. Helibeam System proposals Helifix “truss” layout of DryFix pins to brick slips
  29. 29. Helibeam System proposals DryFix pins installed to stabilise brick slips
  30. 30. Helifix’s solutions <ul><li>Based on 4 C s </li></ul><ul><li>Competency </li></ul><ul><li>Credibility </li></ul><ul><li>Cooperation </li></ul><ul><li>Cost </li></ul>
  31. 31. Competency <ul><li>In-house technical expertise and understanding of complex masonry behaviour and defects </li></ul><ul><li>Provision of supporting calculations and drawings </li></ul><ul><li>Innovative techniques capable of resolving the defects </li></ul><ul><li>Ability to train the operators to a high standard of installation </li></ul>
  32. 32. Credibility <ul><li>Track record of innovative repair projects completed internationally </li></ul><ul><li>Qualified technical staff </li></ul><ul><li>Understanding of the wider structural issues </li></ul><ul><li>Acceptance of expertise by other parties </li></ul>
  33. 33. Cooperation <ul><li>Increasing cooperation between Pitchmastic and Helifix evolved during the course of Phase 1 </li></ul><ul><li>Also close liaison between Helifix and Arup/Knowles </li></ul><ul><li>Cooperation enabled a radical changeover from the original proposals to the Helibeam System approach </li></ul>
  34. 34. Cost <ul><li>Overall Helifix material value around £750,000 </li></ul><ul><li>However, cost savings due to Value-engineering were many millions of pounds </li></ul>
  35. 35. Value engineering benefits <ul><li>Comparison with original proposals: </li></ul><ul><li>Predictable, fixed costs </li></ul><ul><li>Substantially decreased installation times </li></ul><ul><li>Considerable improvement to overcladding installation times (no obstructions) </li></ul><ul><li>Overall reduction in total programme </li></ul>
  36. 36. Summary <ul><li>Helifix System approach was accepted due to quality of technical submission and support provision </li></ul><ul><li>Original design proposals were completely replaced </li></ul>
  37. 37. Summary <ul><li>Installation of Helifix System enabled considerable value-engineered savings to be made </li></ul><ul><li>Cooperation was a critical success factor </li></ul>
  38. 38. Thank you Stress Free Structural Solutions