IMPROVING THE METHODS OF MILLING GAUGE ON HIGHWAYS

Abstract

Machines for milling asphalt concrete surfaces appeared on the highways of the Republic of Kazakhstan about ten years ago. Before that, the replacement of the old asphalt pavement took place under the deafening crack of jackhammers. Road cutters made it possible to replace this outdated technology with profiling of asphalt concrete surface. This type of work consists in removing the asphalt coating layer by cold milling. Typical characteristics of the road milling cutter: working speed of 5-7 m /min, sufficient power, traction and stability to ensure accurate maintenance of the working depth from 3.5 mm to 5 cm; automatic leveling system using a leveling beam or string; automatic control of the milling depth using guide slides; the ability to maintain a given transverse slope; auxiliary equipment for the selection of crushed material (asphalt granulate) at a given processing speed; the width of the working area of the milling strip is 2-4 m. Profiling of old asphalt pavement is an automatically controlled process of cold milling it to restore a given transverse and longitudinal profile, remove bumps, potholes, wear zones, as well as other coating defects, and as a result, obtain a surface that allows for the immediate start of movement or the laying of a fresh coating. Modern road cutters allow you to plan the old coating, texture its surface, giving it the lost coupling and noise protection properties, remove the old coating layer by layer (with an accuracy of up to mm) or immediately to the full depth, carefully open the places of laying underground pipelines and communication lines, release the old coating manholes and even level concrete floors in industrial premises. In this paper, this problem is supposed to be solved by presenting the road cutter as an automated road transport and technological manipulator operating in generalized technological coordinates for the repair of road surfaces with variable track age and due to the transition from elastic (power) to rigid (coordinate) closure of the technological scheme for milling track gauges.