In this article we consider issues of structure designing of reinforced concrete rods with cirle cross-section. There are theoretical aspects of rod torsion in the article. We analyse actual codes and standards and found out that there is no any methods of rod calculation with circle cross-section. Methods of calculation are given in the article. Field tests of rod torsion were carried out. In article you can see main points of test, the procedure of test and results.
Keywords: rod torsion, rotational moment, roll, reinforced concrete, verification test in situ, designing of reinforced concrete rods, shear reinforcement
Karst processes are one of the most dangerous natural and man-made processes. Due to the significant spread of karst in Russia, the assessment and monitoring of karst risks is an urgent problem. The solution to this problem may be the creation of a service to monitor karst processes taking place in the cities. The influence of karst processes is determined by the type of karst hazard. Karst danger of the territory is estimated on the basis of its complex studying with use of various engineering-geological methods. Given the significant costs of eliminating the consequences of karst failures, it is advisable to organize work on the prevention and monitoring of dangerous geological processes. The basis of this work will be the creation of an information system of the geological situation of the territory. This information system is implemented in three stages: 1. Establishment of regularities of karst development in the territory and determination of sequence of research by geophysical methods. 2. Collection of data on the geological situation, as well as the preparation of a program of permanent monitoring of the territory. 3. Programming and entering the data into the information system, which allows the formation of new maps and forecasts. The introduction of this information system will determine the area of potential development of the karst, thereby reducing the economic and environmental damage caused by these processes.
Keywords: karst, karst processes, karst danger, karst forms, karst channels, karst massif, failure, subsidence, monitoring, geological situation
In the article there are results of modeling of the work of steel concrete screw and drilling piles interacting with the soil massif . For the purpose of modeling the mathematical apparatus of finite element method was used in realization of the license certified program complex Lira- soft v.10.6. The process of modeling of the subsidence is described. There is a presentation of three options of interaction of soil and piles. Draft magnitudes of single piles from external load and from negative friction forces are found.
Keywords: Steel concrete screw pile, drilling pile, soil massif, subsidence, Lira-soft, draft, deformations, movements, tensions
We consider two different manufacturing techniques developed screw piles ACSYS. The order of devices of this type of piles. Describes the advantages of the pile ACSYS in comparison to other existing precast, vibrodent and rammed piles. Marked features of work in a structurally unstable soils.
Keywords: screw pile, AXIS, subsiding soils, screw, load capacity, screw skvazhinoobrazovatel, besklinkernom binder, vent soil liner
The article deals with the results of studies of the effect of additives on the grinding intensifiers processes of structure binders. The studies were conducted by X-ray diffraction analysis of the samples of compositions with applicable supplements.
Keywords: slag-alkaline astringent, intensificators of grinding, grinding intensifiers, X-ray analysis, X-ray diffraction, interference maximum
The article deals with the results of studies of the effect of additives on the grinding intensifiers processes of structure binders. The studies were conducted by differential thermal analysis of the samples of compositions with applicable supplements.
Keywords: slag-alkaline astringent, intensificators of grinding, differential thermal analysis , dehydration, endothermic effect, exothermic effect