Method of forming the expansion of the printed piles with the analysis of the obtained shape of the expansion on their bearing capacity in comparison with the piles without expansion
Students Name: Shpur Vadym Serhiiovych
Qualification Level: master (ESP)
Speciality: Building and Civil Engineering
Institute: Institute of Civil Engineering and Building Systems
Mode of Study: full
Academic Year: 2020-2021 н.р.
Language of Defence: ukrainian
Abstract: Shpur V. S., Gladishev G. M. (supervisor). Method of forming expansion of the printed piles with analysis of the obtained shape of the expansion on their bearing capacity in comparison with the piles without expansion. – Lviv Polytechic National University, Lviv, 2021. Extended abstract Problem statement: today construction in Ukraine is developing at an accelerated pace. This leads to the use of built-up areas that were once considered unpromising due to the complexity of the terrain, the density of the surrounding buildings, weak soils or high groundwater levels. However, the trends of modern construction show that such projects are investment-friendly even in Ukraine. The only thing that customers pay for - the implementation of more expensive design and engineering solutions. Since the foundation is a very expensive part of the building, its design solutions must be as rational as possible and often must meet the following requirements: - to accept all loadings with observance of conditions of durability, reliability and durability; - work in a chemically aggressive or water-saturated environment; - be easy to perform; - be cheap in manufacture and operation Such unfavorable conditions (difficult relief, engineering-geological conditions, features of the building site) first of all complicate the design of the foundation. The above trends often force the design of foundations with greater load-bearing capacity, which means more frequent use of pile foundations. The default pile foundations avoid some of the problems: - different technologies of their arrangement allow their performance on different types of reliefs and complex (due to density or inaccessibility) areas of buildings; - pile foundations have the largest range of bearing capacity; - technical and economic comparisons often show a small difference in the manufacture of this type of foundation compared to others. As the listed problems meet more and more often, use of pile bases is predicted more often. The development of more effective methods of piling will always be a topical issue. There are two approaches to achieving this goal: the development of technologies for faster or cheaper installation of structures and the creation of more efficient types of piles on the main bearing characteristics. If we consider the second of the areas of research, it is clear that many developments relate to the expansion of the pile base, and the implementation of such expansion is most often performed using residual asbestos-cement casings or temporary metal. The former are quite cheap, solve the tasks set before them, but complicate the technological process. The latter are quite expensive, but have a large resource of use (if removable) and allow you to perform some types of expansion. If you replace the material of the pipes with cardboard, you can take a new look at the ways of expansion and approach the technological process with a different logic of materials. Of course, cardboard products are soaked under the influence of water, corroded by many substances and have less strength. But with the addition of water-repellent additives, cardboard pipes have become possible to use in construction (mainly as a disposable formwork for round columns), even as the main load-bearing structures. The main advantages of this material are cheapness and ease of processing. But even the most famous of the architects and designers who used cardboard pipes as load-bearing structures did not use them in foundations. Given the above, it is obvious that this topic is promising and has not yet been studied. Study Object: bored piles with an extended heel. Scope of research: the effect of increasing the load-bearing capacity of a bored pile with an extended heel due to perforation in a cardboard casing. Goal of research: to study the influence of the structural shape of bored piles in casing on their load-bearing capacity in comparison with piles without extensions. Research objectives: - Use cardboard pipes as a non-removable casing of a reinforced concrete pile; - Make piles in cardboard casings with new structural forms; - Test piles in the laboratory; Compare the bearing capacity of the obtained piles in order to determine the most rational shape; - Compare the theoretical calculations of different samples of reinforcement to determine the most effective of the presented structural forms. Field of application: pile foundations in casings. Research methods: - Analysis of traditional pile reinforcement systems; - Conducting experimental research and data processing; - Execution of theoretical calculations according to the method of DBN Scientific novelty: - The use of cardboard pipes as casing pipes bored piles. - Creation of new constructive forms due to options of perforation of casings. Practical application: the obtained results can serve as a scientific and technical justification for the patent of the design of the pile with expansion in the perforated cardboard casing. Keywords: stuffed piles, cardboard casings, bearing capacity. ? PSEFERENCES 1. DBN B.2.1-10-2009 - Change 1 "Foundations and foundations of buildings. Basic design provisions. Change 1 "- Ministry of Regional Development of Ukraine - K. - 2011 - 59 p. 2. Pyankov S. A. Pile foundations: a textbook - UlSTU Ulyanovsk, 2007 3. Radkevych, A. V. Organizational and technological solutions for bored piles in water-saturated soils / AV Radkevych // Visn. Dnipropetrovsk. nat. University of Iron. transp them. acad. V. Lazaryan. - Dnepropetrovsk, 2008. - Issue. 21. - P. 167–169 4. SCIENTIFIC AND TECHNICAL JOURNAL “MODERN TECHNOLOGIES, MATERIALS AND STRUCTURES IN CONSTRUCTION” Soil mechanics and foundations 5. Kovalev V. A. - Bulletin of Eurasian Science - Vip. №4 – 2019 6. Ter-Martirosyan Z. G. - Materials of Academic readings on geotechnics - 2006 - Kazan - p.122-131 7. Petrenko Yu. V. Peculiarities of arrangement of foundations from bored piles in difficult engineering-geological conditions / Yu. V. Petrenko // Bulletin of the National University "Lviv Polytechnic". - 2012. - № 728: Architecture. - P. 241-246 8. Shevchenko L. - Past and present in the works of Japanese architect Shiner Ban - Theory and History of Architecture - 2013 - Kharkiv - P. 139-144 9. GP SALADO – Construindo com tubos de papelao: um estudo da tecnologia desenvolvida por Shigeru Ban – 2006 – Sao Carlos 10. GOST ISO 1924-1-96