COMPARATIVE ANALYSIS OF CONSTRUCTION TECHNOLOGIES FOR THE DEVELOPMENT OF UNDERGROUND PARKING SPACE: THE EXAMPLE OF MOSCOW

The article reveals the advantages and disadvantages of various technologies for the mechanized construction of underground parking, which are used in the leading capitals of the world and offers an analysis of the effectiveness of these technologies for the conditions of Moscow. Among the most commonly used trenchless technologies, parking is considered in mines arranged by mechanized shaft-boring complexes, the construction of support by the method of a screen of pipes and the construction of parking by the method of jackpunching pipes of rectangular cross-section.

Trenchless Sewer Rehabilitation Methods and Solving Diversity of Cured Sleeves Thickness

For the rehabilitation and renovation of sewerage and gutter networks, different methods and technologies have been introduced over the last half-century. The trenchless technologies are showing the greatest development. They are promoted for reasons of environmental friendliness, they do not restrict the space in the place of renovation and the implementation is fast. The paper focuses on specific material starting points for the use of trenchless methods. Trenchless methods do not generate waste from original pipelines. New pipes are installed in the existing pipeline, or a new pipeline pushes the old profile into the surrounding area. However, the new pipeline is not accessible for the traditional methodology of result control and product performance verification. Particularly for Cured-in-Place-Pipe (CIPP) methods, it is difficult to determine representative quantities for key features such as the thickness of the sanitary insets (sleeves) after curing, and it follows from practice that the measurements should be performed with a special spike gauge. CIPP products achieve all the final properties through the installation process in the existing pipeline. Simulation on semi-operative polygons is increasingly being used for research and verification of suitable representatives. Authors of the article began to address this issue in research, in collaboration with the company WOMBAT, s.r.o. when investigating the higher resistance of CIPP lining.

DEVELOPMENT TRENCHLESS TECHNOLOGY ECONSTRUCTION OF PIPELINE COMMUNICATIONS WITH A CLEANING PISTON

The expediency of reconstruction of pipelines of Ukrainian cities with trenchless technologies is substantiated. The technology of trenchless reconstruction by extending a smaller diameter polyethylene pipe into a worn steel pipe is described – the method of "pipe in a pipe". The advantages of this method are presented. The analysis of possibilities of existing traction means for carrying out of such works is carried out. The technology of trenchless reconstruction of pipeline communications by developing a new polyethylene pipeline into a worn steel cleaning pig has been developed. A section of a new polyethylene pipeline is attached to the cleaning pig by a barbell. The pig moves under the pressure of air, which is fed into the cavity space by the compressor. The inter-tubular space in the working trench is sealed with a sealing system, which is clamped by a clamp or flange to a worn steel pipeline. The mathematical modeling of the process by pipeline drainage with a cleaning pig is executed. Dependences were obtained for the calculation of the resistance forces acting on the moving system, namely, the mechanical friction forces of the pig cuff to the walls of the steel pipe, the friction forces of the polyethylene pipe to the steel, the friction force of the polyethylene pipe in the cuffs of the sealing system. Dependences are obtained which allow us to calculate the required pressure in the cavity space so that the pig has dragged a new polyethylene pipeline all along the length of the reconstructed horizontal or sloping worn steel pipeline. Under the design pressure in the cavernous space, equipment is selected to perform work