Housing Technologies in Royal Commission Projects January 2011

Transcription

1 ROYAL COMMISSION FOR JUBAIL & YANBU ROYAL COMMISSION IN JUBAIL الهيي ة الملكية للجبيل وينبع الهيي ة الملكية بالجبيل Housing Technologies in Royal Commission Projects January 2011

2 Background Between RC has built 2,197 of Villas for ownership using : - Precaste Concrete ( 1,140 units ) - Aerated Concrete ( 931 units ) - Polyfab ( 75 units ) - Cast-in-Situ ( 51 units ) Precast Concrete ( 123 units)

3 Currant Housing Plan Under Deve. 13,000 Units Under Const. Royal Commission 1,280 units Under Deve. Royal Commission 1,320 Units Private Sector 3,915 Units

4 Study of New Technologies Identify new means, methods, techniques, procedures, and materials of considered to have merit for inclusion in future residential contracts. Compare new superstructure technologies relative to the existing favored technology of precast concrete wall panels and prestressed hollowcore concrete flatwork. Describe schedule and cost advantages and disadvantages; relative to RC s current, typical A2- type villa.

5 Typical A2- Villa Maid s Room Future Bedroom Roof Living Bedroom Future Bedroom Penthouse Plan Dining Bedroom 3 Bedrooms G.F. Area 155 m 2 F.F. Area 143 m 2 Penthouse Area 39 m 2 Built Area 337 m 2 Majlis G.F. Plan Master Bedroom F.F. Plan

6 Scope and Parameters TOTAL 10 Substructure - 8% Superstructure - 39% Finishes - 10% Mechanical - 11% Other Architectural Elements 22% Electrical/ Telecom. - 10% O & M Supplier Availability Labor Intensive Durability Adaptability Speed of Erection Const. Cost Thermal Insulation Substructure; earthwork, foundations, and the Ground Floor slab-on-grade. Superstructure; All structural elements above the Ground Floor slab-on-grade, such as columns, beams, bearing/shear walls, and framed floor and roof slabs. Finishes; floor coverings, wall coverings, applied ceiling finishes, dropped ceilings, and skirting. Mechanical; heating, ventilating, air-conditioning, and plumbing systems, equipment, and fixtures. Other Architectural Elements; cabinetry, countertops, thermal and moisture protection, doors, windows, and plumbing fixtures. Electrical/Tel-Com; electrical, power, data, and telecommunication systems, equipment, and fixtures

7 Precast Concrete & Hollow Core Slabs Description Advantages Disadvantages Schedule Suppliers/Cost Data Sources Precast concrete wall panels and prestressed hollow-core concrete slabs. Suitable for single- and multi-family; low- and mid-rise buildings. Multiple suppliers, durable, fast field erection, not field labor-intensive, high plan adaptability, and low O & M. Relatively high initial cost and moderate thermal insulation. 1 week field erection on average for superstructure only. Qanbar, Robieah & Nassar, Bina, Inco, and Membaco

8 Precast Concrete Modular Units Description Precast concrete modular units with integrated walls and slabs. Suitable for single- and multi-family; low- and mid-rise buildings. Advantages Durable, super-fast field erection, not field labor-intensive, and low O & M. Disadvantages Schedule Suppliers/Cost Data Sources Limited suppliers, relatively high initial cost, moderate thermal insulation, and limited plan adaptability. 2 days field erection on average for superstructure only. Composite Global Solutions/Rotando Weirich (USA)/Saudi Oger

9 Aerated Concrete Description Advantages Disadvantages Schedule Suppliers/Cost Data Sources Lightweight concrete blocks for walls and panels for slabs. Suitable for single- and multi-family; low-rise buildings. Fast field erection speed, relatively low initial cost, good thermal insulation, and high plan adaptability. Limited suppliers, moderate durability, field labor-intensive, and moderate O & M. 1 week field erection on average for superstructure only. Siporex and ZAMIL-ACICO.

10 Insulated Concrete Forms Description Advantages Disadvantages Schedule Suppliers/Cost Data Sources Stay-in-place, dense Styrofoam-type formwork for walls and slabs with cast-in-situ concrete fill over and between the forms. Suitable for multifamily; low- and mid-rise buildings. Fast field erection speed, relatively low initial cost, high plan adaptability, and high thermal insulation. Limited suppliers, low durability, field labor-intensive, and moderate O & M. 2 weeks field erection on average for superstructure only. Plastbau, Samaya, Jedran, and ECO, EBS

11 Mesh Frame Panel Description Advantages Stay-in-place, dense Styrofoam-type formwork for walls and slabs with castin-situ concrete fill and prefabricated steel reinforcing panels. Suitable for multi-family; low- and mid-rise buildings. Fast field erection speed, high plan adaptability, and high thermal insulation. Disadvantages Limited suppliers, low durability, field labor-intensive, moderate O & M, relatively high initial cost. Schedule Suppliers/Cost Data Sources 2 weeks field erection on average for superstructure only. Coffor (a Swiss Patent available in Bahrain/ Saudi)

12 Composite Insulation Modular Unite Description Advantages Disadvantages Schedule Suppliers/Cost Data Sources Insulated, sandwich modular units with integrated walls and slabs. Suitable for single- and multi-family; low-rise buildings. Fast field erection speed, not field labor-intensive, and high thermal insulation. Limited suppliers, low durability, moderate O & M, relatively high initial cost, and limited plan adaptability. 2 days field erection on average for superstructure only. Red Sea Housing (Jubail)

13 Reinforced Concrete Masonry Description Advantages Disadvantages Schedule Suppliers/Cost Data Sources Standard reinforced concrete masonry unit (c.m.u.) construction combined with a number of different slab framing systems. Suitable for multi-family; low-rise buildings. Multiple suppliers, durable, and relatively low initial cost. Slow field erection speed, field labor-intensive, low thermal insulation, moderate adaptability, and moderate O & M. 8 weeks field erection on average for superstructure only. Al Maymani and others. A large number of structural c.m.u. (ASTM C90, Type 1) manufacturers are available for Jubail Industrial City.

14 Superstructure Field Erection Schedule Weeks Days Reinforced Concrete Masonry Insulated Concrete Forms (Plastbau) Mesh Frame Panels Aerated Concrete System (Siporex) Precast Concrete Panels & H.C. Slabs Composite Insulation Modular Units Precast Concrete Modular Units

15 Construction Cost SAR % Reinforced Concrete Masonry Insulated Concrete Forms (Plastbau) Mesh Frame Panels? Aerated Concrete System (Siporex)? Precast Concrete Panels & H.C. Slabs Composite Insulation Modular Units? Precast Concrete Modular Units?

16 Cost Vs. Schedule Installation Time vs Cost 100 Precast Concrete & HC Slab Cost as % of current construction method Precast Concrete Insulated Concrete Form Modular Units Aerated Concrete Composite Insulation Modular Units Mesh Frame Panels Reinforced Concrete Masonry Duration (working days)

17 Superstructure Technology Evaluations System O & M Supplier Availability Labor Intensive Durability Adaptability Speed of Erection Const. Cost Thermal Insulation Total of Ratings Reinforced Concrete Masonry Insulated Concrete Forms Mesh Framed Panels Aerated Concrete Systems Precast Concrete Panels & H.C. Slabs Composite Insulation Modular Units Precast Concrete Modular Units Rating Grades : Poor Below Average Average Above Average Excellent

18 Latest Tools for High performance & Optimum Designs for Buildings LEED (Leadership in Energy & Environmental Design ) Building Design, Construction and Operations for and Environment, and Enhanced Quality of Life. Economic Benefits Social benefits Environmental benefits

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20 Conclusion Precast Concrete Panel/Hollow-Core Slab still stand as the method of choice although cost is the highest Aerated Concrete, Insulated Concrete Forms offer an overall competitive advantages compared with Precast, however cost need to be tested in bidding. Precast Concrete Modular Units offer rapid construction. Limited suppliers and plan adaptability are the systems primary negatives. Could be considered in future

21 Conclusion. Cont.. From the above, RC has selected Precast as the base bid for future contracts with the inclusion of alternative bids for Aerated Concrete and Insulated Concrete Forms. Studying new methods shall continue and consider those offers competitive advantages. Tools such as LEED should be used for evaluation of design and can be used for selection methods.

22 Thank you