The choice of economic method of flooring strengthening during the reconstruction of the garment factory due to factory re-profiling in Khmelnitsky
Students Name: Lemeshko Nazar Oleksandrovych
Qualification Level: magister
Speciality: Urban Construction and Economy
Institute: Institute of Civil Engineering and Building Systems
Mode of Study: full
Academic Year: 2020-2021 н.р.
Language of Defence: ukrainian
Abstract: Lemeshko N.O., Vihot S.I. ( head ). The choice of economic method of reinforcement of the floor during the reconstruction of the garment factory in connection with the re-profiling in Khmelnitsky. Master’s qualification work. Lviv Polytechnic National University, Lviv, 2020. Extended annotation The production building is a garment factory. The house has two floors with a basement, dimensions in plan 33.6 x 21.48 m. The height of the basement is 2.5 m, the others - 3.95 m. The building has a typical floor plan. The project envisages the addition of two floors and the re-profiling of existing premises for a coworking center. Planning takes place on a typical floor. Structural scheme of the house - a brick frameless structure with longitudinal and transverse brick walls and the support of floor slabs on the walls and reinforced concrete columns. The brick for walls is used ordinary red solid, wall thickness - 640 mm. The existing reinforced concrete columns are made with a cross section of 45x45 (cm), concrete class C15 / 20. The inner walls are 510 mm thick, the jumpers are prefabricated reinforced concrete. The floor is made of reinforced concrete slab with a thickness of 250 mm. The floors are made of metal beams that rest on the outer walls. To test the load-bearing capacity of strip foundations and perform structural reinforcement, I collected the load in accordance with DBN B.1.2-2: 2006 "Loads and impacts". After collecting loads with this data, I performed a manual calculation of the running meter of the tape. The width of the sole of 1.4 m was not enough, so you need to make a concrete with a total width of 2.1 m. I decide to take the traverses from the channels №24. According to the design we take 2 frames with lower and upper reinforcement, step 250 mm, diameter - 12 mm. Transverse reinforcement with a diameter of 12 mm, a step of 500 mm. The calculation of the reinforcement of the basement floor beams was performed in the PC "Lira-CAD" and checked manually. Since the cross section of the beams was insufficient - I decide to use the method of welding metal plates at the bottom of the I-beam, as the design does not allow to reach the top. According to the calculation, the thickness of the metal plate should be 10 mm. In the technological section, three technological maps were developed on the basis of reconstruction processes, namely the reinforcement of strip foundations, reinforcement of metal beams of the basement floor, dismantling of the pitched roof and superstructure of the floor. Also, a calendar schedule was drawn up for each map to perform the described construction works. The duration of each process is calculated and presented in the process maps. In the economic section, I made a local estimate for the main construction and installation work. All calculations were made on the basis of prices and time norms for major construction works as of December 2020. The total cost of works, including superstructure and strengthening, makes 11229037 UAH. The object of research - technological processes of the device of strengthening of overlapping. The subject of research - strength and deformation characteristics when installing reinforcement of the floor. The purpose of scientific research is to compare the methods of strengthening the metal beams of the basement floor. After collecting the loads, the calculations of the reinforcement of the beams must be carried out. Due to the corrosion of the I-beam №24 (bearing capacity which would be enough) actually had the size of the shelves of the I-beam №18. Therefore, a calculation was performed to strengthen these beams. Comparing the two types of reinforcement, namely reinforcement by increasing the cross section by welding plates and installing additional beams, we conclude that the first option is better at the price of 35796 UAH and 41448 UAH, and the complexity of 411 and 436 man-hours. The decision was chosen to use reinforcement by increasing the cross-sectional area for secondary beams, and for the main - the installation of additional beams. Key words: reinforcement, reinforced concrete, technological map, reinforcement, metal beam, plate, concrete mortar, estimate. List of sources used: 1. Ivanyk IG, Vihot SI, Vybranets Yu.Yu. "Fundamentals of reconstruction of buildings and structures" Textbook. - 2010 2. DBN B.1.2-2: 2006 Loads and effects 2005 - 46p. 3. M.G. Yarmolenko "Technology of construction production" - Kyiv, "Higher School", 1993 4. Technology of construction production: Course of lectures for students of engineering - construction profile / Encl .: Ya.Y. Kotsiy, Ph.D.