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UDC 628.147.25
Mirskov A. N.
Tooling of a mobile milling robot machine for pipeline repair
Summary
The specific aspects of cutting tool operation designed for equipping a mobile milling robot machine that is used in the process of water and wastewater pipelines rehabilitation are considered. A set of tools has been designed consisting of a twistdrill, an end-milling cutter, a grinding wheel, a cutting-off abrasive wheel, a diamond head, a combined tool for fiberglass drilling and milling. The cutting tool set can be used for opening holes in metal pipes, cutting the ends of ceramic and reinforced concrete pipes, drilling and milling fiberglass covers. The cutting tool is fixed in a spindle unit of the robot machine and is electrically driven. To control the tooling process the robot operator uses a video camera with back light and telemetry data on the position of the work tools. The technical guides are given for using the tool. The developed tool has passed laboratory and field tests with the positive results.
Key words
trenchless repair , pipeline network , milling robot machine , cutting tool
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UDC 628.1/.2:621.644.075
Prodous O. A., Terekhov L. D.
Selection of polyethylene pipe grades for trenchless rehabilitation of water and wastewater pipelines
Summary
In the world practice different methods of trenchless rehabilitation of water and wastewater pipes are used. Selecting a method of trenchless rehabilitation is recommended solely after having compared the cost of the set of process equipment, its payback period and hydraulic characteristics of the pipeline before and after the rehabilitation. A method of substantiating the selection of polyethylene pipe grades for trenchless rehabilitation of water and wastewater pipelines is presented. The method of selecting the diameter of polyethylene pipes is as follows: for a certain pipe material the inner diameters of the pipeline under rehabilitation and pulled through polyethylene pipe are determined according to the existing standards; the ratio between the inner diameter of the pipeline of the section under rehabilitation and the outer diameter of the polyethylene pipe pulled through (by any method) should differ by only one standard size by grades; for comparison the hydraulic characteristics of the pipeline before and after the trenchless rehabilitation are determined by tables (handbooks); the cost of the process equipment, payback period and the hydraulic characteristics of the pipeline before and after the rehabilitation are compared. Thereafter the diameter of the pulled through polyethylene pipes is accepted. A comparative analysis of the hydraulic parameters for two methods of trenchless rehabilitation with the use of 160–400 mm diameter polyethylene pipes was carried out. The results of comparing the hydraulic characteristics of a pipeline in the process of rehabilitation with and without host pipe destruction are presented.
Key words
water supply , pipeline , trenchless repair , sewerage , polyethylene pipes , pressure losses
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UDC 628.147.2
Emelin V. I., Azeev A. A.
Productivity of a Complex of Equipment for Trenchless Repair of Pipelines by Means of a Combined Sleeve Drawing
Summary
Methods of the determination of productivity of the complex of equipment for trenchless repair of pipelines by means of composite covering in the course of drawing the combined sleeve with due regard for influence of basic constructive and technological features is offered. Reserves of the productivity increase owing to enlargement of the bay’s length, combination of some operations, taking into account characteristics of covering and other factors are determined. Five conditions of the equally effective designing of details of the complex of equipment are formulated.
Key words:
capacity , pipeline , trenchless repair , complex of equipment , composite coverings , combined sleeve
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UDC 628.143.004.67
Shaikhadinov А. А., Brungardt M. V., Karpov Igor Vasilievich, Ushakov A. V.
Universal working mechanisms of hydraulic machines
for trenchless pipeline rehabilitation
Summary
The advanced technology of trenchless rehabilitation of old pipelines with the use of hydraulic machines with the working mechanism that includes a cutter block with disk blades and a conical expansion tool is considered. Shockless pipe destruction provides for reducing significantly the risk of soil sloughing and damage of the adjacently laid underground utilities. The analysis of similar working mechanisms of the hydraulic machines for trenchless pipe renovation (Grundoburst Tracto-Technik, Germany, and Hydro Burst Vermeer, USA) revealed a number of drawbacks consisting in the limited application area and low level of versatility of these working mechanisms that did not provide for pulling through a new plastic pipe of extended length; repairing pipelines with bends and turns; renovating pipelines of wide diameter range with the use of a single equipment set. Three prototypes of the working mechanism based on hydraulic machines were manufactured and tested. The first prototype provides for pulling through a new plastic pipe that is 1.5–2 times longer (to 200 meters and more). The second is designed for the renovation of pipelines with up to 45 degrees bend angle. Adding joint assembly links allow increasing the bend angle (to 70 degrees). The third prototype is designed for renovating pipelines of various diameters (fracture from 150 to 200 mm) with the use of a single set. This design makes the given technology more simple and cheap. The suggested designs of the universal working mechanisms based on hydraulic machines provide for trenchless pipeline rehabilitation under various operating conditions.
Key words
pipeline , trenchless repair , hydraulic machine , working mechanism , pulling part
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