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balloon concrete formwork
- 1. BALLOON CONCRETE FORMWORK SUBMITTED BY: RAKSHITH.M.R(4JN09CV041) GUIDENCE BY: IRFAN KHAN M.Tech ASSISTANT PROFESSOR
- 2. CONTENTS Introduction Typesof Alternative Constructions Balloon Concrete Formwork Designing and making inflatable forms Material Requirements Form Fabrication Product Information Installation Applications Advantages of Balloon Concrete Formwork Conclusion 2
- 3. INTRODUCTION System isbased on using an inflated balloon as a single form for a structure. The balloon is inflated with bumps that form the window and door holes. Welded wire mesh is cut to the size of the form and concrete-sprayed in place to strengthen the structure. The concrete mix used is "foamcrete" which has a higher proportion of air bubbles 3
- 4. TYPES OF ALTERNATIVE CONSTRUCTIONS AUTOCLAVEDAERATED CONCRETE BALLOON CONCRETE FORMWORK FORMLESS CONCRETE CONSTRUCTION INSULATING CONCRETE FORMS 4
- 5. BALLOON CONCRETE FORMWORK DESIGNING ANDMAKING INFLATABLE FORMS Shape of air forms. The designer of an air form must achieve a balance between economy and aesthetics, using flat fabrics to create three-dimensional forms. A recent report indicates costs from 45Rs to 78Rs per square foot of surface area. 5
- 6. Material Requirements •PVC coatednylons and polyster fabric are usual. •A glass or plastic U-shaped tube containing water has one open end exposed outside the form and the other exposed within the inflated form. 6
- 7. A ropebuilt into the edge of the form and anchor bolts The larger forms are shipped on pallets and require a crane or forklift for unloading. A crew of three to six must unroll and carefully place the form on its foundation, distributing the fabric evenly around the perimeter. A high-volume, low- pressure blower is used to inflate the form to its design shape at the pressure designated by the form designer. 7
- 8. •Water is placedin a U-shaped tube with one end open to the air and the other open to the inside of the form (see drawing).Coloring the water makes it easier to read. •The material must be strong enough to resist inflation pressures typically in the8
- 9. Form fabrication Flat piecesof the air form are heat-sealed together with a bar sealer or rotary welder so that they stretch in to a smoothly curved surface when inflated. 9
- 10. Product Information o Cement. oSand. o Foaming Agent. o Accelerator. o Super Plasticizer. o Forming System. o Balloon. 10
- 11. Installation Concrete Mixer:Computer-controlled mixer producing 60 cubic yards of "Foamcrete" per hour. Procedure: The mixer pumps "Foamcrete" to five housemen simultaneously working on four houses. Delivery: Delivery times are quoted on a job-by-job basis. 11
- 12. APPLICATIONS Wallac Neff designedItalian style mansions for Hollywood celebrities, but he also designed some revolutionary bubble houses. 1 2
- 13. In a smallArizoa town is a house that looks like a 2000- sqare-foot ball helmet sticking out. 1 3
- 14. Tiny Monolithic DomeHomes…Prefab dome houses from Korea. 1 4
- 15. Picture shows thecomfortable interior of home. 15
- 16. No cutting within200 feet of riparian areas(lakes and streams)roads, campgrounds, picnic areas, administrative sites, summer home areas 1 6
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- 18. CONCLUSION This method hasprovided a solution whereby air-supported forms may be used for such large concrete domes. The overall cost of dome project using air-supported forms is very efficient. Safety construction of about 300 ft. in diameter. 1 8
- 19.
Editor's Notes
- #15 Tiny Monolithic Dome Homes ... Prefab dome houses from Korea.