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Technology of precast concrete structures- م.11 - مبادرة #تواصل_تطوير- أ.د. إسلام عز العرب

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Technology of precast concrete structures- م.11 - مبادرة #تواصل_تطوير- أ.د. إسلام عز العرب

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م.11
مبادرة #تواصل_تطوير
المحاضرة الحادية العاشرة من المبادرة مع
الأستاذ الدكتور/ إسلام عز العرب
استاذ الانشاءات بكلية هندسة طنطا
بعنوان
"تكنولوجيا المنشآت الخرسانية مسبقة الصب "
العاشرة مساء بتوقيت مكة المكرمة الثلاثاء 12مايو2020
وذلك عبر تطبيق زووم
علما ان هناك بث مباشر للمحاضرة بالتوازي على قناة اليوتيوب الخاصة بجمعية المهندسين المصريين
http://www.youtube.com/watch?v=EQAH3_CUWJM
ونأمل أن نوفق في تقديم ما ينفع المهندس ومهمة الهندسة في عالمنا العربي
والله الموفق

ملاحظة : تجنبا لاي ظروف, لطفا المشاركة على قناة التليجرام للحصول على دعوات المحاضرات على ZOOM
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رابط قناة التليجرام
https://t.me/EEAKSA

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م.11
مبادرة #تواصل_تطوير
المحاضرة الحادية العاشرة من المبادرة مع
الأستاذ الدكتور/ إسلام عز العرب
استاذ الانشاءات بكلية هندسة طنطا
بعنوان
"تكنولوجيا المنشآت الخرسانية مسبقة الصب "
العاشرة مساء بتوقيت مكة المكرمة الثلاثاء 12مايو2020
وذلك عبر تطبيق زووم
علما ان هناك بث مباشر للمحاضرة بالتوازي على قناة اليوتيوب الخاصة بجمعية المهندسين المصريين
http://www.youtube.com/watch?v=EQAH3_CUWJM
ونأمل أن نوفق في تقديم ما ينفع المهندس ومهمة الهندسة في عالمنا العربي
والله الموفق

ملاحظة : تجنبا لاي ظروف, لطفا المشاركة على قناة التليجرام للحصول على دعوات المحاضرات على ZOOM
رابط اللينكدان
www.linkedin.com/company/eeaksa-egyptian-engineers-association/
رابط قناة التليجرام
https://t.me/EEAKSA

رابط قناة الفيسبوك
https://www.facebook.com/EEAKSA/

رابط قناة اليوتيوب
https://www.youtube.com/user/EEAchannal

رابط التسجيل العام للمحاضرات
https://forms.gle/vVmw7L187tiATRPw9

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Technology of precast concrete structures- م.11 - مبادرة #تواصل_تطوير- أ.د. إسلام عز العرب

  1. 1. Technology of Precast Reinforcement Concrete Structures Prepared by Prof. Dr. Islam Ezz El-Arab
  2. 2. OUT LINE : 1. Introduction 2. Features and benefits 3. General Principals of Precast 4. Project progress 5. General description of products 6. Architectural Façade Elements 7. New techniques of precast HCS 8. Conclusion Examples of Precast projects (photos)
  3. 3. 1- INTRODUCTION • What is Precast? • How to produce it? • How to Install it? • QA / QC • Project Progress.
  4. 4. •Higher construction efficiency •Design freedom & flexibility in •Forms •Colours •Shapes •Textures •Excellent resistive characteristics •Thermal •Acoustic •Fire •Higher quality & improved durability •All weather construction •Environmentally friendly construction 2. FEATURES & ADVANTAGES OF PRECAST CONCRETE CONSTRUCTION • Advantages of precast • Speed • Quality • Cost
  5. 5. What is Precast? • Successful use is largely dependent on an effective structural layout and carefully conceived connection details. • The effects of restraint of volume changes caused by creep, shrinkage and temperature change must be considered in every structure. • Architectural Precast panels can be used as cladding as well as load bearing members. they can be used to support loads in both the vertical and lateral directions. • Pre-stressing improves the economy and performance of precast members, but is usually only feasible with standard shapes which are capable of being cast in long –line beds.
  6. 6. 3. General Principals of Precast • Precast concrete is basically a “ Simple-Span” material However, continuity can be achieved with properly conceived connection details. • Sizes and shapes of members are often limited by Production, Handling and Erection consideration. • Maximum economy is achieved with maximum repetition.
  7. 7. TRANSFORMING THE DESIGNER’S VISION INTO A FINISHED STRUCTURE Thorough knowledge of the materials Experience in the design and detailing High levels of workmanship & ingenuity Understanding the important design considerations dictated by: - Materials characteristics - Structural analysis - Manufacturing and installation efficiencies
  8. 8. Membership & Qualification International Industry and Academic Membership: National Precast Concrete Association (NPCA) Precast/Pre-stressed Concrete Institute (PCI) The Congress for New Urbanism (CNU) Meet the Following National and International Standards: ISO 9001: 2008 National Standard of China Companhia de Desenvolvimento Habitacional e Urbano INSTITUTO DE PESQUISAS TECNOLOGICAS
  9. 9. WWhole Process of pprecast structures Construction
  10. 10. BIM of whole process Layout edit BOM list checking Closing account Logistics Construction management Construction simulation Budget control BIM Data Base Engineering department Materials purchasing PC components production Design and construction of building information modeling Completion
  11. 11. 4. Project Progress 1. Initial stages 2. Planning 3. Execution 4. Monitoring, control & reporting 5. Final stages
  12. 12. Project Progress 1- Initial stages • Project award memorandum • Value Engineering (Value Management) • Budget • Quantity Survey • Assigning a Project Coordinator • QC/QA documents • Materials Submittal
  13. 13. Project Progress 2. Planning • Overall planning • Value engineering (Value Management) • Production and installation techniques for cost effectiveness and efficiency of work, value engineering is done for: • Process • Material • Moulds • Moulds planning • Material procurement • Detailed production plan • Detailed Installation plan
  14. 14. 3. Execution Production Storage Delivery Installation Project Progress
  15. 15. Define whole production model Check against requirements with parametric rules engine Optimize and visualize schedule Generate drawings & BOM automatically Provide product data to ERP Intelligent Precast Concrete Factory
  16. 16. PC Curing Chamber Steel Bar Processing PC Demoulding Finished PC Products Concrete Spreading and Vibrating Layout of PC Factory
  17. 17. PRECASTER ENGINEERING MAPING PLAN • Design Criteria • Purpose of the element • Loading criteria • Production constraints • Size • Shape • Delivery constraints • Height • Length • Installation constraints • Weight https://www.youtube.com/watch? v=gsklP03biNk
  18. 18. 55. Precast Products : o Precast Slabs o Load bearing Wall panels o Insulated exterior Wall panels o Shear and Core Walls & Stair modules o Columns, Slabs and Beams o Precast Strip Footing
  19. 19. Standard components Columns Floor BeamsRoof Beams Floor Slabs
  20. 20. Vertical Load Bearing Precast columns Example of standard dimensions Connection details
  21. 21. Vertical Load Bearing Precast columns and walls Requires skilled labor and consultant technical supervision Complicated connections Still under research for seismically active zones Currently cast-in-situ columns and walls are recommended for high-rise buildings
  22. 22. Precast Columns
  23. 23. PRECAST COLUMNS WITH CORBELS
  24. 24. Erection of precast column
  25. 25. Vertical Load Bearing Precast walls Connection details B C H Minimum 4.00 m 2.40 m - Normal 6.00 - 12.00 3.60 - 6.00 2.60 - 3.30 Maximum 14.00 12.00 4.20 - 4.50 Shear wall Cross wall FloorCross wall Floor
  26. 26. Beams Secondary roof beams Straight I beamsRectangular floor beams Rectangular beams Inverted floor beams Sloped I beamsPrimary roof beams
  27. 27. Precast floors Floor type Span Height Width kN/m² 9 m 100 - 300 mm 300 - 1200 mm 2.0 - 4.0 20 120 - 550 1200 2.0 - 4.8 24 (30) 200 - 800 2400 2.0 - 5.0 9 150 - 300 600 1.5 - 3.5 6 100 - 250 300 - 600 0.7 - 3.0 7 100 - 200 600 - 2400 2.4 - 4.8 7 200 - 300 - 1.8 - 2.4
  28. 28. Precast floors Basic module normally 1200 mm Large flexibility in floor layout Punching resistance is a function of the slab cross-section and thickness of topping Hollow core slabs
  29. 29. Hollow Core Slab (HCS)
  30. 30. HCS Stationary Casting Bed and production table
  31. 31. Precast beam and precast cantilever slab connection detail
  32. 32. Precast beam and precast floor slab connection detail
  33. 33. Full precast commercial and administration structures .
  34. 34. PPrecast pre stressed double T slab section
  35. 35. B- PRECAST BEAMS
  36. 36. Precast BEAMS SECTIONS
  37. 37. Precast BEAMS SECTIONS
  38. 38. D- PRECAST WALLS
  39. 39. PRECAST WALL 1 SECTION 1 REINFORCEMENT DETAIL OF PRECAST EXTERNAL WALL (SW1) SANDWITCH PANEL
  40. 40. PRECAST WALL REINFORCEMENT DETAIL OF PRECAST EXTERNAL WALL 2 SECTION2 DETAIL-X SANDWITCH PANEL - WITH OPENING
  41. 41. PRECAST WALL 2 SECTION2 DETAIL OF PRECAST INTERNAL SOLID BEARING WALL
  42. 42. PRECAST WALL SECTION1 1 DETAIL OF PRECAST INTERNAL SOLID BEARING WALL WITH DOOR OPENING
  43. 43. Precast wall plant technology
  44. 44. E- PRECAST STAIR
  45. 45. PRECAST STAIR CASE PRECAST STAIR--- SCALE 1:25
  46. 46. Precast Stair case
  47. 47. What is Precast?
  48. 48. H- PRECAST CLADDING
  49. 49. PRECAST CLADDING PANELS C7 C3 C25 +5.500 T.O. PANEL (B46) + +10 T.O (B90) C4 C3
  50. 50. Precast cladding panel
  51. 51. 6-Pre cast Finishing o Face Concrete Finishing o Exposed Aggregates o Sandblasting o Acid Etching o Pigments o Form Liners o Veneer Faced Panels
  52. 52. Architectural Finishes Texture - Form Liner - Exposed Aggregate - Acid Etched - Sand Blasted - Bush Hammered Veneer-faced, stone, brick, or ceramic Color - Pigmented - Naturally colored aggregates Shape - Unlimited shapes
  53. 53. Face Concrete Finishing Smooth as Cast (Post paint) Smooth, as cast finish is the most economical. Unfortunately, this finish is seldom aesthetically acceptable due to pinholes on return surfaces and because of color variation. Smooth as cast precast concrete panels have a smooth film of hardened cement paste, and the finished color is therefore determined primarily by the color of the cement.
  54. 54. Exposed Aggregates (washed finish) Exposed aggregates finishes are achieved by coating the form into which the concrete will be poured with a concrete retarder. The retarder arrests the hardening of the concrete which comes in contact with it, to a depth determined by the strength of the retarder. The final product of the exposed aggregates can be in Light exposure, Medium exposure or Deep Exposure.
  55. 55. Sandblasting Sandblasting removes the cement sand matrix by abrasion, a result of the impact of sand on the panel surface. The final product of the product can be in Light exposure, Medium exposure or Deep exposure.
  56. 56. 7. New techniques of precast HCS
  57. 57. 1- NEW SPECIAL DETAILS HCS OF STEEL STRUCTURES
  58. 58. 22- NEW details of shear strengthen WWeb Shear Strengthening Technique of Deep Precast Prestressed Hollow Core Slabs under Truck Loads https://www.scirp.org/journal/paperinformation.aspx?paperid=79451
  59. 59. What is Precast?
  60. 60. 33- New Technique for Partial Continuity of Simple Support Beam- CColumn Connection http://www.iosrjournals .org/iosr- jmce/papers/vol13- issue5/Version- 8/F1305083950.pdf
  61. 61. Conclusion Precast concrete structures is 1 - Experience in the design and detailing 2 - Understanding the important design considerations dictated by: - Materials characteristics - Structural analysis - Manufacturing and installation efficiencies.
  62. 62. Examples of precast projects
  63. 63. THANK YOU

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