Operational features and reliability of drill rods during controlled trenchless laying of underground utilities

Abstract

When laying distribution networks in densely built-up cities, significant difficulties arise due to the need to cross roads, tram and railway tracks. In such cases, installations for trenchless laying of engineering networks are widely used. At the same time, a well with a complex trajectory is formed in the soil with the help of soil-piercing equipment. The efficiency of the operation of machines and installations is ensured by the reliability of the operation of the drill rods, which transmit the force pressure from the installation to the piercing head. Exaggerated bending of the rods in curved sections can lead to their breakage and loss of working equipment in the soil. Goal. The object of the study is the process of the effect of bending of drill rods on their operational reliability when creating a communication cavity in the soil on curved sections of the route. Methodology. The work uses mathematical calculation methods to determine the permissible radius of bending of the pipeline whip, taking into account profile and the physical and mechanical properties of the material from which the pipe is made. Results. The work establishes the conditions for the reliable use of drill rods, taking into account the curvature of the puncture trajectory and the critical bending radius of the rods. The resulting calculation dependencies account for the geometric parameters of the rods and the mechanical properties of the material from which they are made. The permissible deviations of the soil puncture trajectory from the axis of movement and the length of the span when correcting the movement of the equipment and the soil are also determined. Originality. An approach to well design based on permissible bending radii of drill rods is substantiated. Practical Value. The results of the work are of great practical importance, which is to increase the operational reliability of drill rods during trenchless laying of engineering communications.