Purpose. The paper proposes: 1) determination and formulation of factors that influence the choice of rational method for joining re-bars of vertical support members of reinforced concrete frame; 2) determination of factor parameters; 3) ranging of factors by the expert evaluation (Delphi) method. Methodology. In order to achieve research objectives, it is necessary to carry out analysis of existent rebar connection methods, determination of factors and parameter variation limits for each of the methods. Performing factor ranking by the expert evaluation method. Findings. The results of the questioning materials of 14 experts in the area of monolithic construction allowed setting the following: when choosing the rational re-bars connections, the most significant values are the factors that define the time parameters: possibility of carcassing, time of joining the re-bars, length of rebar cage, prior operation run time, operation time of main lifting equipment. Herewith the factors that define the rebar cage parameters have a direct relation to the work performance time, as they determine the amount of bar connections in the course of building erection over wide range. Economic factors -rebar connection cost and quality control cost -have the less value. It is obvious that in the conditions of considerable construction expenses it is advantageous for an investor to increase the rebar joining cost for the work growth rate. Structural and technological factors have the least value: origin of eccentric load transmission between re-bars, possibility of use of the thermally workhardened re-bars of А500 and higher grades, work category for implementation of works, necessity to use the scaffold and appurtenances for re-enforcement of constructions. The reason is analogical: a contractor is ready to go to complication of technology with the purpose of reduction of the facility erection terms. As the calculated Pearson's matching criterion χ 2 = 47.24 is higher than the tabular one (22.36203), then the obtained concordance coefficient W=0.26 is not casual value, and that is why the obtained results make sense and can be used in further researches. Originality. The author obtained factors that influence the choice of the rational method for re-bars connection the most. Practical value. Ranging of factors will allow objective approaching to the problem of choice of re-bars connection method, optimizing the labour and material costs, and also reducing the construction time.

Goal. The purpose of the work is to study the means of increasing the reliability of fixing special construction equipment on the railway platform. Method. The study was carried out on the basis of the analysis of literary sources, the experience of using special construction equipment fasteners, and the development of proposals for the use of possible equipment fasteners on rolling stock, and an assessment of the prospects for their application was made. The results. In the process of conducting research, it was established that sets of universal multi-defense fasteners are a reliable and strong attachment of special equipment to specially designated nodes and parts on the railway platform, which will prevent oscillations and translational movements (shaking) during transportation, as well as overturning of the machine. Scientific novelty. The scientific novelty of the work lies in the fact that for the first time, based on the selected concepts, a system for choosing reliable fastening of special construction equipment has been formed. Practical significance. The urgent problem of increasing the level of reliability and strength of fastening special wheeled and tracked machinery on the railway platform has been solved.

Purpose. Determination of conformities to law of influence of expense of components of easy concretes, which turn out on the basis of local afterproducts of industry, on their basic properties under conditions of enhanceable efficiency of the use of cement. Methodology. Experimental studies on optimization of structures and properties of concrete were carried out with use of mathematical planning experiments methods. All experiments were carried out on orthogonal design with three variables. Cement, water and additives PLKP-2 consumption were taken as varied factors. Findings. Vast experimental studies on determination of rational compositions of concrete mixtures were conducted with the use as fillers of granulated slag from iron and steel plant named after Petrovskiy and Dnepr sand, as binding agent Krivoy Rog portland-cement II/B-Ш-400, as filler fly-ash of Pridneprovsk Thermal Power Station. Efficiency coefficient of cement use was adopted as basic criterion of concrete composition rationality, it is determined on the relation of the attained durability per unit weight of used cement. For greater efficiency coefficient of cement use regularity of rational grain composition of components previously obtained was adopted, it is provided at a ratio of a large fraction consumption to medium and small 52:23:25, and their sizes are approximately 100:10:1. Experimental studies with use of mathematical planning experiments method were carried out. By results of their processing isofields were constructed according to the strength and effectiveness of the use of cement ratio of the studied factors. Originality. By strength comparative tests of hardened concrete with various local secondary resources, modified with complex plasticizer PLKP-2 additive, it was found that lightweight concrete with the density of 1700…1800 kg/m3 and concrete compressive strength from 5 to 20 MPa on the basis of granulated slag from the iron and steel plant named after Petrovskiy filled with fly-ash of Pridneprovsk Thermal Power Station during ensuring of rational grain composition of components with a ratio of major components of the fractions to medium and small 52:23:25 are the most effective. Practical value. Compositions of lightweight fine grained mixture based on granulated slag from the iron and steel plant named after Petrovskiy filled with fly-ash of Pridneprovsk Thermal Power Station and modified with complex plasticizer PLKP-2 additive were determined. They provide required concrete compressive strength within 5…10 MPa at a reduced cement consumption by approximately 20% as compared to the traditionally used compositions for these purposes.

The purpose of the research findings, given in article, is aimed to determine the rational compounds of concrete with an average cubic compressive strength less than 20 MPa with minimum required expenditures of cement. To reach the goal, mathematical planning of the experiment was used with variability of cement consumption from 90 to 190 kg / m3 in the compositions of the concrete mixture, and for the fine-grained filler from tails of processed ores, the consumption was like at 100 to 400 kg / m3. The result of processing experiments has shown us the dependences of the change in strength and coefficient of efficiency of the use of cement of the factors involved. Optimized values increase most intensively with minimum cement consumption and a change in the consumption of fine filler within the limits of the study. The highest coefficient of efficiency of use of cement is expressed by the ratio of the achieved strength per unit mass of used cement in the concrete mix and it was obtained at a cement consumption of 90 kg / m3 and a filler of 400 kg / m3. Using the obtained dependences of optimized values on the factors under study, the composition of concrete may be predicted with a strength up to 20 MPa with the required amount of filler.

Придніпровська державна академія будівництва та архітектури 2 Дніпровський національний університет залізничного транспорту ЗАСТОСУВАННЯ КРИВОЛІНІЙНОЇ ПІДПІРНОЇ СТІНИ ПРИ БУДІВНИЦТВІ БАГАТОПОВЕРХОВИХ БУДІВЕЛЬ Постановка проблеми. Сучасні тенденції будівництва в Україні та світі відзначаються зростанням розповсюдження багатоповерхових та висотних будівель, особливо у великих містах. При цьому в умовах функціонуючих структур міста та існуючої інфраструктури часто виникає проблема будівництва в умовах ущільненої забудови, часто ще й в складних або надскладних гідрогеологічних умовах. Одна з причин такої специфіки полягає у відсутності або значній вартості вільних під забудову майданчиків в більш сприятливих умовах. Крім того, важливим параметром є необхідність об'єднання окремих елементів міської забудови в єдиний інфраструктурний багатофункціональний комплекс. Проблемним полем залишається формування найбільш раціонального конструкційно-технічного рішення несучих і огороджуючих конструкцій підземної частини будівлі, які сприймають у тому числі і значні додаткові зусилля стримування аварійних і зсувонебезпечних грунтових масивів. Мета дослідження-визначення особливостей та переваг застосування криволінійної підпірної стіни з буронабивних паль під час зведення житлово-офісно-торговельного комплексу з готелем та паркінгом по вул. Миколи Амосова у Солом'янському районі м. Києва. Висновок. Підвищення ефективності проектних рішень зведення висотних будівель та їх реалізації, а саме, скорочення тривалості та зниження вартості будівництва в складних гідрогеологічних умовах можливо досягти за рахунок застосування ефективних рішень підпірної стіни та раціонального організаційнотехнологічного комплексу виконання будівельно-монтажних робіт. Необхідне постійне дослідження світового досвіду проектування, зведення і експлуатації складних проектів провідних організацій ведучих країн для постійного вдосконалення і розвитку будівельної галузі України. Ключові слова: висотна будівля, будівельно-монтажні роботи, організація будівництва, підпірна стіна, ущільнена забудова, гідрогеологічні умови, вартість, тривалість.