No 2 (2010)

Method of strengthening of ramming foundation pit throat and device for it's realization is presented in this paper. It has demonstrated that reverse taper formation in the pit throat when earth-moving during ramming of pits can be precluded due to installing metal case in it, provided by flat area, supported on the ground surface.

The investigation results of reliability indices of construction technological system with simultaneous functioning of main and reserve elements are provided. The dependence of reliability indices of construction technological system using simultaneous functioning of main and standby elements of production process enables to evaluate the efficiency of chosen work organization scheme.

Analysis of effective reinforcement of wide-span cast in situ beamless slabs are presented in this paper. Recommendations about designing and technology of reinforcing of this type of slabs are given.

The protection of the concrete and reinforced concrete structures against the oil products used in industrial buildings for cooling and lubrication of the technological equipment is examined. In the case of the laying on the mentioned constructions surface of 5-6 layers of the paint-and-lacquer materials these constructions are impermeable even for the light fractions of the oil products.

Research and estimation results of reliability of sanitary-engineering armature of internal waterpipe systems in residential buildings are presented. The attention is focused on fact, that operational reliability's indicators of sanitary-engineering armature of internal waterpipe systems in residential buildings can be defined on the basis of analysis, statistical data processing of registration and malfunctions in controller's record books and also by their consideration on the basis of reliability theory.

Complex of investigation of adsorption a chlorphenol and chloroform by their compatibility in the presences from waters by activated carbon AG-3 and SKD-515 are different by nature, structure, size specific gravity of surface was studied. The fundamental laws, peculiarity and machinery of organic components was established. Machinery of mass-transfer by adsorption of chlorphenol and chloroform mixture was showed. The main adsorption and kinetic parameters was defined. A model for balance of process adsorption of mixture consist from range of study about equilibrium, kinetics and dynamics adsorption of chlorphenol and chloroform in front of solution from water with activated carbon AG-3 and SKD-515, and calculation of engineering was suggested. The technology of adsorption purification drinking water was developed.

Application of an electrodialysis for the natural water treating from superfluous quantity of inorganic salts is described. Principles of the modeling of electrodialysis apparatus are offered. The equations are obtained for the model, that take into account fluid dynamics and changes of membrane characteristics with the length of apparatus and in time.

The technology of filtering receivers of water plays a significant role in water supply of cities. The basic advantages of constructions for filtering are submitted in article. A conclusion that accident protection devices for a fish represent the major device for prevention of hit of fishes in mechanisms of a fence of water.

The main aspects of the urgent problem of safety of hydraulic structures in Russia is reviewed including the recent catastrophic failure of the Sayano-Shushensk hydropower plant (6400 MW) in Siberia. The main features of the innovative program «Safety of Hydraulic Structure» is presented aimed for teaching and training of students of Peoples' Friendship of Russia (PFUR) for degree of Master of Science in Hydraulic and Dam Engineering.

The 2-D stress-strain state analyses of Boguchansk concrete dam was performed using ADINA program with various models of concrete and rock foundation: elastic, ideally elasto-plastic with Mohr-Column criterion and nonlinear brittle models. The main properties of the nonlinear brittle model with strength softening of concrete and rock foundation were considered. The stress-strain state of dam sections under actions of hydrostatic and uplift pressures was analyzed and assessed as a favorable, but severe cold winter temperatures can transfer the dam state into unfavorable.

The expediency of erection of high concrete dams cutting on columns in severe climatic conditions with use cutting on columns on concreting blocks is shown. Necessity of reception sufficient for carrying out of cementation of disclosings of time building joints is noted. Are offered cementic materials providing carrying out of successful cementation of seams with small disclosings.

Pressure oscillations in water lines with air cap (pressure stabilizer) under water hammer are considered. Method of characteristics is used. Problem of optimal perforation square in a cap is investigated. A problem of optimal perforation square in an air cap is considered.

The elaboration of mathematical model of monolithic concrete free-ended column of Skating field house in Krylatskoe and calculation of its dynamic parameters. The calculations of frequencies of self-induced longitudinal and lateral vibrations for two types of loadings and sampling of number of finite elements for its calculation.

The algorithms for geometrical computer modelling of space framed structures are discussed in the paper. These algorithms are implemented by the authors in computer software. The software is based on geometrical analysis and visualization of selected types of structural systems based on unified prototypes and includes the feature of combining prototypes, thus creating complex spatial framed systems.