Applied Sciences
| Open Access |
DOI: Slinging Unit For A Hollow-Core Floor Slab Of Stand-Off Formwork
Pulat Mirzaev , Candidate Of Technical Sciences, Professor, Department Of Building Structures, Faculty Of Construction Of Buildings And Structures, Tashkent Institute Of Architecture And Civil Engineering, UzbekistanAbstract
Due to the fact that hollow-core slabs without formwork are produced without slinging loops (features of manufacturing technology), the issue of installation and transportation of these slabs has been solved. A constructive and technological solution is proposed for a slinging unit, arranged in the body of the slab, without the use of a slinging loop, and having only an anchor rod-dowel through which it is possible to directly sling the slab without using traditional slinging loops. The unit is designed with a reduced metal consumption and does not change the technology for manufacturing hollow-core slabs without formwork. Found and summed up a theoretical basis for calculating the bearing capacity of the proposed slinging unit, arranged in a hollow-core slab without formwork. It was revealed that the bearing capacity of the proposed slinging assembly, arranged in the body of a hollow-core slab, under the action of assembly loads, depends on the force of splitting the concrete of the protective layer located above the anchor rod-dowel of this assembly (all other things being equal). The theoretical data of the study were verified by full-scale tests of plates with slinging units arranged in their body, carried out in accordance with the proposed constructive and technological development. A utility model patent was obtained for the development of a loopless slinging unit for a hollow-core slab without formwork.
Keywords
Loopless slinging assembly, hollow-core slab, form-less molding
References
Goncharova M. A., Ivashkin A. N., Kosta A. A. Selection and optimization of concrete compositions for the production of hollow-core slabs without formwork. Construction Materials. Moscow: No. 3 (2017). -pp. 35-38.
Barkov Yu. V., Zakharov VF Cross-shaped loops for reinforced concrete hollow-core floor slabs without formwork bench molding. Housing construction. Moscow: No. 10 (2008). -pp. 24-27.
Barkov Yu. V., Golofast SI, Zakharov VF Smirnov L. Yu. Multi-hollow building product and method of its production. Patent for invention RU 2 204 665 C1 (20.05.2003).
Anferov V.A. A hollow building product and a method for its manufacture. Invention patent RU 2.263 748 C1. (10.11.2005).
Degotkov O.V., Krivchikov A.N. Poly-hollow building product and method of its manufacture. Invention patent RU 2 313 639 C1 (27.12.2007).
Serbinovsky A.V., Pesotsky E.A., Pinevich S.S. Reinforced concrete hollow-core slab of stand-off formwork molding. Utility model patent RU 65 917 U1. (27.03.2007).
Shashin A.F., Kalinichev N.N., Minkin B.R., Closed assembly loops in heavy concrete products. Concrete and reinforced concrete. Moscow: No. 9 (1986). -pp. 5-6.
Grinev V.D., Popkov Yu.V., Gil A.I. Hollow reinforced concrete slabs with modified mounting loops. Bulletin of Polotsk State University. Applied Sciences. Series F. Construction. No. 16 (2011). -pp. 67-70.
Ashkinadze G.N., Sokolov M.E., Martynova L.D., Lishak V.I. (USSR), Tassnos F., Tsukantas S., Plainis P., Skarpas A. (Greece). Reinforced concrete walls of earthquake-resistant buildings: Research and design bases. Moscow: Stroyizdat. (1988). –p. 504. - ISBN 5-274-00212-5.
Rasmussen B. H. Strength of transyezsely loaded boltsand dowels cast info conerete. Laboratoriet for Bygningastatik, Denmark Technical University, Meddelelse. vol. 34. №2, 1962.
Utesher G. and Herrmann M. Vesushe zur Ermittlung der Tragfahig Keit in beton eingespannter Rundstahldollen aus nichetrostondem austenitischem Stahi. Deutscher Ausschuss fur stahlbeton, Heft 346, Berlin, 1983, p 49-104.
Gustafsson P. J. and Hillerborg A. Impovements in concrete design achieved trhough the application of feacture mechanics. NATO ARW: Fracture Mechanics in conrete. Northwestern University, September, 1984.
Мирзаев П. Т., Умаров К. С., Мирзаев Ш. П., Шухратходжаев Ж. М. Многопустотная плита безопалубочного формования. Патент на полезную модель UZFAP01501 (29.05.2020).
Article Statistics
Downloads
Copyright License
Copyright (c) 2021 The American Journal of Applied sciences
This work is licensed under a Creative Commons Attribution 4.0 International License.
Authors retain the copyright of their manuscripts, and all Open Access articles are disseminated under the terms of the Creative Commons Attribution License 4.0 (CC-BY), which licenses unrestricted use, distribution, and reproduction in any medium, provided that the original work is appropriately cited. The use of general descriptive names, trade names, trademarks, and so forth in this publication, even if not specifically identified, does not imply that these names are not protected by the relevant laws and regulations.