RU2540004C1 - Bench for investigation of equipment and processes of trenchless repair of pipelines - Google Patents

Abstract

FIELD: measurement equipment.

SUBSTANCE: proposed bench for investigation of equipment and processes of trenchless repair of pipelines includes the following components installed on a base: an investigated pipe, where an investigated flexible sleeve folded twice with inversion is located, and its outer edge is fixed on the pipe, a system of pressure creation at the sleeve and a dynamic mechanism in the form of a movable weight on the block, and a traction dynamometer, installed in a detachable manner as capable of autonomous connection with the inner edge of the sleeve, at the same time the source of pressure at the sleeve is a compression cylindrical chamber mounted as capable of autonomous connection with a compressor and with a hydraulic recirculation system, and connected with an investigated pipe in the area of fixation of the outer edge of the sleeve by means of a replaceable attachment, and also equipped with a pneumatic gate connected to the compressor, and the gate comprises a body and an inner elastic collar capable of displacement of the sleeve in it, the inner edge of which is connected to a dynamic mechanism, besides, the compression chamber is equipped with winding coils as fixed on the central shaft perpendicular to the central axis of the investigated pipe, the inner one, capable of sleeve winding with its inner edge, and the outer one, capable of autonomous connection with a movable weight or a traction dynamometer of the dynamic mechanism.

EFFECT: provision of multi-variant determination of head and average speed of water flow, head loss, kinetic energy coefficient, coefficient of hydraulic friction at various combinations of loads at different models of pipes and sleeves.

10 cl, 4 dwg

Description

The invention relates to measuring equipment. Designed to study methods for the restoration of pipelines, mainly internal tubular (tubular) coatings applied by pneumatic or hydraulic pressure. It can be used for modeling and research of operational processes, for designing pipeline repair technologies in the construction and oil and gas industries, and in public utilities.

Similar technical solutions include a hydraulic stand [Orlov V.A. Hydraulic studies and calculation of pressure pipelines made of various materials. Moscow, Vestnik MGSU, 2009, No. 1. S.177-180], [http://vestnikmgsu.ru/files/archive/ru/issues/2009/Vestnik_1-09.pdf]. The well-known hydraulic stand consists of three parallel pipelines 18 m long for applying and studying internal coatings - a polymer sleeve, a polyethylene pipe, a cement-sand coating. Pipelines are fixed on a flyover and connected to a closed recirculation system in the form of a storage tank for water, a pumping unit, and a computer for regulation. The stand is equipped with devices for measuring water parameters in coated pipelines - static and dynamic pressures, volume, pressure head, flow velocity, pressure loss, Coriolis correction coefficient, hydraulic friction coefficient.

A disadvantage of the known hydraulic stand is the ability to study only the end product of the hose technology in the form of a coating, namely its hydraulic characteristics, which is the reason for the limitation of technological (research) capabilities.

The prototype of the invention is a stand for the study of equipment and processes of trenchless pipe repair [RF Patent for the invention 2473068; claimed September 27, 2011]. A well-known stand is a test and test equipment installed on the basis of. Testing equipment consists of a vacuum pump or vacuum cleaner, a vacuum gauge, a load with a cable block assembly, and a dynamometer. The equipment under study - a pipe and a flexible sleeve - is mounted with the possibility of modeling studies at various parameters, including the size and shape of the pipe, the material of the sleeve, its thickness, the number of layers. The sleeve is folded in two by eversion and connected at one end — the outer — to the pipe, the other — the inner — to the moving load or to the dynamometer via a cable.

The prototype has insufficient technological, specific research capabilities due to the limitation of the pressure range, types of hoses, stages of modeling hose technology for repairing pipelines and types of equipment for introducing the hose.

The objective of the invention is to expand the research and overall technological capabilities of the stand.

The problem is solved in that in the test bench for equipment and processes for trenchless pipe repair, including the test pipe installed on the base, in which the studied flexible sleeve folded in two by eversion is located, the outer edge of which is fixed to the pipe, a pressure generating system, and also a dynamic mechanism in the form mobile load on the block and tensile dynamometer, each of which is removably mounted with the possibility of autonomous connection with the inner edge of the sleeve, according to the invention, the system Creating the pressure on the compression sleeve is a cylindrical chamber adapted to be connected to auxiliary compressor and to the hydraulic recirculation system and connected to the test pipe at the place of fastening the outer sleeve edge. The test tube and the test sleeve located in it are connected to the compression chamber hermetically by means of a replaceable nozzle. The compression chamber is connected to a pneumatic shutter, consisting of a housing and an internal elastic cuff with the ability to move the sleeve located in it, the inner edge of which is connected to a dynamic mechanism. The pneumatic valve is connected to the compressor. The compression chamber is equipped with a central shaft and winding coils fixed on this shaft — internal, with the possibility of winding the sleeve, and external, with the possibility of autonomous connection with a moving load or with a dynamometer for stretching a dynamic mechanism. The central shaft of the compression chamber is installed perpendicular to the central axis of the pipe under study. The compression chamber is made with two tangential nozzles, one of which is connected to the test tube, the second to the pneumatic shutter. The studied pipe and tangential branch pipes of the compression chamber are fixed on the stand base coaxially. The horizontal axis of the pipe, tangential nozzles, pneumatic shutter cuffs, tensile dynamometer, upper level of the block wheel chute are located at the same level from the stand base.

The studied pipes are a set of pipe models, each of which is installed on the base of the stand, is made with differential characteristics and is equipped with a replaceable nozzle. A set of interchangeable nozzles is designed for tight connection with a compression chamber. The kit contains nozzles of various diameters, including nozzles, the diameter of which is equal to the diameter of the pipes, and nozzles, the diameter of which is made with the possibility of telescopic connection to the pipe. Differential characteristics of pipes are material, pipe dimensions and shape, nature and size of pipe defects.

The studied sleeves are a set of samples of sleeves, each of which is made with differential characteristics in diameter, length of the sleeve, material, thickness of the material, number of layers, internal cladding or reinforcing waterproofing material, external adhesive coating.

The hydraulic recirculation system (GDS) is made in the form of a storage tank connected in a cycle with a compression chamber and equipped with a pumping unit, shutoff valves, heater, instrumentation, computer.

The stand is equipped with instrumentation for measuring flow, pressure, traction, velocity head, flow velocity, pressure loss, time (duration), air and water temperature, geometric dimensions of the studied models.

The compression chamber, interchangeable pipe nozzles, the pneumatic shutter body are made of steel or reinforced fiberglass.

The technical result of the invention is the expansion of the research and technological capabilities of the stand as a result of, firstly, the equipment of the stand with a source of pressure on the sleeve in the form of a compression chamber made with the possibility of autonomous connection with the compressor and with the gas distribution station and the formation of a pneumatic line and a hydraulic cycle, and secondly camera equipment with two coils fixedly mounted on a common shaft - internal, for fixing the sleeve edge and creating a sealed space inside enney sleeve cavity and an outer, for transmission to the same dynamic load sleeve (tension) generated by the movable cargo; thirdly, the equipment of the stand with a pneumatic shutter, made with the possibility of adjustable stretching and moving the sleeve inside the cuff under the action of a moving load. The specified implementation of the stand determines the study of models of pipes and hoses in pneumatic and hydrodynamic modes by pneumatic or hydraulic pressure with simultaneous dynamic extension of the sleeve.

The technical result of the invention is also the equipment of the studied pipe models with interchangeable nozzles of various diameters, which contributes to the expansion of the study range of hoses with different wall thicknesses.

The technical result of the invention is also the possibility of an exact horizontal arrangement of the sleeve model due to, firstly, coaxial fastening on the basis of the test tube stand and the tangential nozzles of the compression chamber; secondly, the location of the pipe axes, tangential nozzles, the pneumatic shutter cuff, the tensile dynamometer, the upper level of the block groove at the same level from the base of the bench, which helps to increase the accuracy of the simulation of the experiment (research).

The stand for the study of equipment and processes of trenchless repair of pipelines is presented in the drawings at different operating modes: Fig. 1, Fig. 2, Fig. 4 in the frontal plane, Fig. 3 - in plan.

The stand consists of a set of pipe models, a set of samples of hoses, a system for creating pressure on the sleeve in the form of a pneumatic line and a hydraulic cycle, a dynamic mechanism, the base 1 of the stand (Figs. 1-4).

A set of pipe models consists of pipes with the following various characteristics: material - cast iron, concrete, metal, plastic, glass; dimensions - diameter, length, wall thickness; form - configuration of bends and bends; the nature and size of the defects - through, through, absence of defects. A length scale is applied to the outer wall of the pipes, for example, in centimeters.

The studied pipe 2 (Figs. 1-4), selected from the kit, is fixed on the base 1 of the stand with the help of a rotary plate 3 and fixing supports 4 (Fig. 1, Fig. 2, Fig. 4). The set of pipe models is equipped with a set of interchangeable nozzles 5 (Fig.1-4). One of the ends of each of the nozzles 5 is made with the possibility of connection to the pipe 2, for example, butt or telescopically, the second end of the nozzle 5 is made in the form of a flange (not indicated) with an opening.

A set of sample sleeves consists of sleeves with different characteristics. The characteristics of the sleeves include at least the diameter, length of the sleeve, material (fabric, polymer, composite, etc.), the thickness of the material, the number of layers, the inner cladding layer, the outer adhesive layer, a reinforcing waterproofing layer, for example, of synthetic resins.

The studied sleeve 6 (Figs. 1-4), selected from the kit, is located inside the pipe 2. The sleeve 6 is folded in two by eversion and has two edges (two ends) - external and internal. The end of the sleeve with the outer edge is fixed motionless, for example, with clamps (not marked) on the replaceable nozzle 5 of the pipe 2.

The system for creating pressure on the sleeve consists of a compression chamber, a pneumatic shutter, hoses, valves, measuring instruments, a compressor, a hydraulic pump, and gas distribution system.

The compression chamber is a cylindrical housing 7 (FIGS. 1-4) with a central shaft 8 (FIG. 1, FIG. 2, FIG. 4) and two tangential diametric coaxial nozzles — output 9 and input 10 (FIG. 1, FIG. 2, Fig. 4). The axis (not shown in the drawing) of the nozzles 9, 10 is perpendicular to the central shaft 8. The ends of the nozzles 9, 10 are equipped with flanges (not marked) with holes. One of the ends of the shaft 8 is located outside the housing 7. In the housing 7, an internal winding coil 11 is installed on the shaft 8 (FIG. 1, FIG. 2, FIG. 4), an external winding coil 12 is installed at the end of the shaft outside the housing 12 (FIG. 3) . The coil 11 is designed to wind the end of the sleeve 6 (inner edge). Coil 12 is designed to be connected to elements of a dynamic mechanism (see below for more details). The end of the outer end of the shaft is equipped with a steering wheel with a rotary handle and a stopper (not indicated in the drawing).

The pneumatic shutter is a housing 13 (Fig.1-4), for example, a cylindrical or elliptical section with two end flanges (not indicated) with coaxial holes. Inside the housing 13 is an elastic pneumatic cuff 14 (figure 1, figure 2). A pneumatic shutter is designed to control the pressure on the sleeve 6 created inside the cuff 14 with the possibility of simultaneous loading of the sleeve under the action of a moving load (see below for more details).

The housing 7 of the compression chamber is equipped with a fitting 15 (figure 1, figure 2, figure 4). The housing 13 of the pneumatic shutter is equipped with a hose 16 (figure 1, figure 2, figure 4) and a safety valve (not indicated). The fitting 15 and the hose 16 are combined and connected to the main hose 17 (Fig. 1, Fig. 3), for example, by means of a fitting (not indicated). The main hose 17 is connected to the compressor and to the hydraulic pump, for example, also by means of a fitting with the possibility of autonomous connection with the compressor or with the hydraulic pump. In the lower part of the housing 7 mounted drain pipe with a tap. The compressor, hydraulic pump, main hose fitting, drain pipe with a tap are not shown in the drawing. Hoses 15, 16, main hose 17 are equipped with taps (not indicated). A pressure gauge 18 (FIG. 1, FIG. 2, FIG. 4) is mounted on the fitting 15 of the compression chamber housing, a pressure gauge 19 (FIG. 1, FIG. 2, FIG. 4) and a pressure reducing gear (not indicated) are mounted on the pneumatic shutter body )

The sleeve pressure system is designed to create pneumatic or hydraulic pressure in the pneumatic line and hydraulic cycle, respectively. The housing 7 of the compression chamber, the hose 15, the main hose 17, valves, measuring instruments are part of the pneumatic line and the hydraulic cycle. In addition, the pneumatic line includes a compressor, a pneumatic shutter, and the hydraulic cycle - a hydraulic pump, GDS.

GDS (not shown in the drawing) is a storage tank equipped with a pumping unit, shutoff valves, heater, instrumentation, and, for example, a computer. The storage tank is connected to the housing 7 of the compression chamber on the one hand through the main hose 17 (supply), on the other hand, with a drain pipe, forming a closed cycle. In addition, the GDS is equipped with a hose and a flange made with the possibility of tight connection to the free end of the pipe 2 (opposite to the connection with the compression chamber), designed to drain the water when the stand is in mode 10 (see below).

The dynamic mechanism includes a removable cable 20 (Fig. 1, Fig. 2, Fig. 3), a block 21 (Figs. 1-4), a removable load 22 (Fig. 1, Fig. 2) from a set of loads of different weights, a removable dynamometer stretching 23 (figure 2, figure 3). The tensile dynamometer 23 is mounted on the bracket 24 (Figs. 1-4) of the base 1. The removable cable 20 is configured to, firstly, connect the end of the sleeve 6 (inner edge), twisted and extended through the pipe 2, then through the inlet pipe 9, the housing 7, the outlet pipe 10 of the compression chamber with a load 22 hanging freely through the block 21 (Fig. 1); secondly, the connection of the end of the sleeve 6 (inner edge), turned and stretched through the pipe 2, then along the inlet pipe 9, the housing 7, the output pipe 10 of the compression chamber with a tensile dynamometer 23; thirdly, fixing the cable 20 to the outer coil 12 and connecting, thus, the shaft 8 with a tensile dynamometer 23 (FIG. 2, FIG. 3).

The location of the equipment on the basis of the stand is made taking into account two conditions, firstly, the pipe 2 and the compression chamber are fixed with the possibility of alignment of the input 9 and output 10 pipes and pipes 2; secondly, the horizontal axis of the pipe 2, nozzles 9 and 10, the cuff 14 of the pneumatic shutter, the tensile dynamometer 23, the upper level of the trough of the wheel of the block 21 are installed on the base 1 of the stand at a constant level with the possibility of horizontal location of the sleeve 6.

The stand works in the following modes.

Modes of study of the traction properties of the sleeve when it moves along the inner surface of the pipe under the action of pressure:

1 - mode of pneumatic pressure in the sealed volume of the sleeve;

2 - mode of pneumatic pressure in a sealed volume with differentiated forces of resistance to eversion of the sleeve;

3 - pneumatic pressure mode in the leaky volume of the sleeve;

4 - pneumatic pressure mode in an unpressurized volume with differentiated forces of resistance to sleeve eversion;

5 - mode of hydraulic pressure in the sealed volume of the sleeve;

6 - mode of hydraulic pressure in a sealed volume with differentiated forces of resistance to eversion of the sleeve;

7 - mode of hydraulic pressure in the leaky volume of the sleeve;

8 - mode of hydraulic pressure in the leaky volume of the sleeve with differentiated forces of resistance to eversion of the sleeve. In addition, the stand operates in the following modes:

9 - mode of manual introduction of the sleeve into the pipe (study of the curing process of the adhesive layer - the final stage of the sleeve technology for repairing pipelines);

10 - mode of coating the inner surface of the pipe (study of the hydraulic characteristics of the in-pipe coatings and pipes of various materials).

In each of these modes, a stand is prepared, a pipe model is selected, a sleeve sample is selected, a replaceable nozzle for the pipe is selected. Study parameters are outlined, including range of pneumatic or hydraulic pressure, dynamic load, number of tests, in accordance with regulatory documents and standards for planning experiments.

Description of the stand in different modes.

1. The mode of pneumatic pressure in the sealed volume of the sleeve (figure 3, 4). Pipe model 2 is selected. For example, a plastic pipe model with an inner diameter of ⌀100 mm with a bend of 45 ° and a through defect of ⌀50 mm is selected. Mark the pipe with a ruler or tape measure, mark the angles of the bends, measure and mark the defects. Choose a sleeve model 6. For example, choose a single-layer stitched sleeve of nylon fabric sewn to a diameter of ⌀100 mm, length 2 m. Choose a replaceable nozzle 5. The flange of the replaceable nozzle 5 is fixed to the inlet pipe 9 of the housing 7 of the compression chamber, for example, using bolts . The pneumatic shutter flange is sealed with a cap. Sleeve 6 is folded in two by eversion. Get a sleeve with two edges (ends) - external and internal, and a blind end at the bend. The blind end face of the sleeve 6 is inserted into the pipe 2, the outer edge of the sleeve is fixed on the replaceable nozzle 5 of the pipe 2, for example, with clamps, the inner edge (second end) is introduced into the housing 7 of the compression chamber through the flange of the inlet pipe 9, wound on the inner coil 8 by rotating the steering wheel. The steering wheel is fixed with a stopper. In this case, a tight space is formed inside the compression chamber and the sleeve. An external coil 12 is connected with a cable 22 to a dynamometer 23. Air is supplied from the compressor through a main hose 17, a fitting 15 to the compression chamber housing 7 and to the sleeve 6. The overpressure is regulated, for example, in the range of 0.01-0.3 MPa using valves . When pressure is reached, for example, 0.3 MPa, the stopper is removed from the helm. Sleeve 6 with a blind end advances along pipe 2. Research is being conducted - they measure excess pressure with pressure gauges and traction forces with a dynamometer.

2. The mode of pneumatic pressure in a sealed volume with a differentiated force of resistance to eversion of the sleeve (figure 3). Pipe model 2 is selected, interchangeable nozzle 5, and sleeve sample 6 in the order indicated in the previous mode 1. A load weighing, for example, 10 kg, is selected. The pipe 2 is connected to the inlet pipe 9 by means of a replaceable nozzle 5 and the outer edge of the sleeve 6 folded in two by eversion is fixed on it, the blind end of the sleeve is inserted into the pipe 2, as described in the description of the previous mode 1. The second end of the sleeve 6 is wound on the compression compression coil 11 chambers are fixed, as indicated in the description of mode 1. In this case, a tight space is formed inside the compression chamber and sleeve. The end of the removable cable 20 is wound on an external reel 12, the load 22 is suspended at the second end. The helm is fixed with a stopper. Air is supplied from the compressor through the main hose 17, fitting 15 into the housing 7 of the compression chamber and into the sleeve 6. The overpressure is regulated, for example, in the range of 0.01-0.15 MPa using valves. When pressure is reached, for example, 0.15 MPa, the stopper is removed from the helm. Sleeve 6 with a blind end advances along pipe 2. Research is being carried out - gauge overpressure is measured with gauges, the time of sleeve movement with a stopwatch, the distance of the sleeve advancement in the pipe is recorded on the pipe scale.

3. The mode of pneumatic pressure in the leaky volume of the sleeve (figure 2). Choose a pipe model with a replaceable nozzle, a sleeve model, mount the outer edge of the sleeve folded in half by inversion, the blind end of the sleeve is inserted into the pipe, as indicated in the description of mode 1. The second end of the sleeve is passed through the nozzles 9 and 10 of the compression chamber, then through the cuff 14 pneumatic shutter. The inner edge of the sleeve 6 is connected to a removable cable 20 and connected to a tensile dynamometer 23. Air is supplied from the compressor through a main hose 17, a fitting 15, a hose 16 to the air lock case 13, to the compression chamber case 7 and to the sleeve 6. The overpressure is regulated in the compression chamber 7, for example, in the range of 0.01-0.5 MPa with a valve. Regulate the overpressure inside the cuff 14 with a pressure reducing valve. Upon reaching the pressure in the compression chamber 7, for example, -0.5 MPa, the stopper is removed from the helm. Sleeve 6 with a blind end advances along pipe 2. Research is underway - register the differential pressure in the compression chamber 7 and the pressure in the cuff 14 using pressure gauges, traction efforts are recorded by the dynamometer 23.

4. The mode of pneumatic pressure in an unpressurized volume with differentiated forces of resistance to eversion of the sleeve (figure 1). Choose a pipe model with a replaceable nozzle, a sleeve model, mount the outer edge of the sleeve folded in half by inversion, the blind end of the sleeve is inserted into the pipe, as indicated in the description of mode 1. The second end of the sleeve is passed through the inlet and outlet pipes 9 and 10 of the compression chamber, further through the cuff 14 of the pneumatic shutter. The edge of the sleeve 6 is connected to the removable cable 20, passed through the block 21 and the load 22 is suspended. Air is supplied from the compressor through the main hose 17, fitting 15, hose 16 into the housing 13 of the pneumatic shutter, into the housing 7 of the compression chamber and into the sleeve 6. Adjust the excess pressure with valves as described in modes 1-3. Upon reaching maximum pressure, the stopper is removed from the helm. Sleeve 6 blindly advances along pipe 2 and simultaneously is pulled under the action of movable load 22, moving inside cuff 14. Research is being conducted - register the differential pressure in the compression chamber 7 and the pressure in the cuff 14 using pressure gauges, the sleeve’s movement time with a stopwatch, and the distance of advancement sleeves along the pipe on the pipe scale.

5. The hydraulic pressure mode in the sealed volume of the sleeve (figure 4). The stand and the equipment under test are prepared as described in the description of mode 1. Connect the GDS. Water is supplied from the hydraulic pump through the main hose 17, fitting 15 into the housing 7 of the compression chamber and into the sleeve 6. The composition and temperature of the working medium are regulated. Exceed hydrostatic pressure as described in the description of modes 1-3. Upon reaching maximum pressure, for example, 0.3 MPa, the stopper is removed from the helm. The temperature of the working medium is measured with a thermometer, excess hydrostatic pressure with a manometer and piezometers, pump performance using a computer, the volume of water passing through with flow meters, a measuring tube, traction is recorded using a dynamometer. At the end of the study, water from the housing 7 of the compression chamber and the sleeve 6 is drained into the storage tank of the GDS through a drain pipe.

6. The hydraulic pressure mode in the sealed volume with a differentiated force of resistance to the eversion of the sleeve (figure 3). The stand and the equipment under study are prepared as described in the description of mode 2. Connect the GDS. Water is supplied from the hydraulic pump through the main hose 17, fitting 15 into the housing 7 of the compression chamber and into the sleeve 6. The composition and temperature of the working medium in the gas distribution system are regulated. Exceed hydrostatic pressure as described in the description of modes 1-3. Upon reaching maximum pressure, for example, 0.2 MPa, the stopper is removed from the helm. Measurements are made, as indicated in the description of mode 5, the time of movement of the sleeve by a stopwatch is recorded, the distance of the sleeve moving along the pipe on the pipe scale. At the end of the study, the water is returned to the GDS as indicated in the description of mode 5.

7. The mode of hydraulic pressure in the leaky volume of the sleeve (figure 2). The stand and test equipment are prepared as described in the description of mode 3. Connect the GDS. Water is supplied from the hydraulic pump through the main hose 17, fitting 15 into the housing 7 of the compression chamber and into the sleeve 6. Overpressure is created in the cuff 14, and is regulated by a pressure reducing valve. Regulate the composition and temperature of the working environment of the GDS. Exceed hydrostatic pressure as described in the description of modes 1-3. Upon reaching a pressure of, for example, 0.1 MPa, the stopper is removed from the helm. The volume of water passing through, the temperature of the working medium, the pump capacity are measured, as indicated in the description of mode 5. The differential pressure drop of the hydrostatic pressure in the compression chamber 7 and the pressure in the cuff 14 are measured with pressure gauges. At the end of the study, the water is returned to the GDS as indicated in the description of mode 5.

8. The mode of hydraulic pressure in the leaky volume of the sleeve with differentiated forces of resistance to eversion of the sleeve (figure 1). The stand and the equipment under study are prepared as described in the description of mode 4. Water is supplied from the hydraulic pump through the main hose 17, fitting 15 into the housing 7 of the compression chamber and into the sleeve 6. Connect the gas distribution system. Supply air to the cuff 14, the excess pressure is regulated by a pressure reducing valve. Adjust the parameters and take measurements as indicated in the description of mode 7.

9. The mode of manual introduction of the sleeve into the pipe. A sleeve 6 is introduced, impregnated with, for example, epoxy resin, into a pipe 2 consisting of two halves obtained from a solid pipe by cutting in the longitudinal direction in the axial plane. Both halves of the pipe 2 are fastened with clamps. GDS is connected, water is supplied. Exceed hydrostatic pressure as described in the description of modes 1-3. Research is being conducted - they measure the temperature of the working medium with a thermometer. The time of the experiment is recorded by a stopwatch. At the end of the experiment, halves of the pipe 2 are disconnected, the resulting coating sample is removed and its physical and mechanical properties are examined using one of the known methods on another bench or installation. Water is returned to the GDS as indicated in the description of mode 5.

10. The mode of coating the inner surface of the pipe. Pipe model 2 is selected. For example, a straight metal pipe with an inner diameter of ⌀100 mm is selected. Choose one of the following coating materials: tubular coating, paint, cement-sand coating, enamel, etc. A coating, for example, cement-sand, is applied to the inner surface of the pipe 2 manually or mechanically. The coating is applied to the entire surface, in parts or in several layers. Dried under normal conditions. The pipe 2 is connected to the compression chamber by means of a replaceable nozzle 5 telescopically. On the opposite side, the pipe 2 is connected to the GRS through a hose with a flange hermetically. Water is supplied to the housing 7 of the compression chamber. Regulate the composition and temperature of the working environment. Exceed hydrostatic pressure as described in the description of modes 1-3. The working agents are fed into the pipe 2 at different temperatures, for example, steam obtained by heating the storage capacity of the gas distribution system, aqueous solutions of salts or other substances. They regulate the composition and temperature of the working medium, the performance of the pump. Adjust parameters and take measurements. At the end of the measurements, water, the solutions are poured into the storage tank of the GDS from the pipe 2 by means of a hose. Explore the hydraulic resistance of the coating, including parts of the coating.

Based on the measurements obtained, the values of the head and average velocities of the water flow are determined, the values of the Coriolis correction coefficient for each section are calculated and its average value is found. The pressure loss in the experimental section of the pipeline model is determined, as well as the hydraulic friction coefficients.

Claims (10)

1. A stand for the study of equipment and processes for trenchless pipe repair, including a test pipe installed on the base, in which a test flexible sleeve folded in two by eversion is located, the outer edge of which is fixed to the pipe, a system for creating pressure on the sleeve and a dynamic mechanism in the form of a moving load on the block and tensile dynamometer mounted removably with the possibility of autonomous connection with the inner edge of the sleeve, characterized in that the pressure source on the sleeve is a compression cylindrical chamber mounted with the possibility of autonomous connection with the compressor and with a hydraulic recirculation system and connected to the test tube at the attachment point of the outer edge of the sleeve by means of a replaceable nozzle, as well as equipped with a pneumatic shutter connected to the compressor, consisting of a housing and an internal elastic cuff with the ability to move there are sleeves in it, the inner edge of which is attached to the dynamic mechanism, in addition, the compression chamber is equipped and fortified fixed on the central shaft perpendicular to the center axis of the tubular, the winding coils - internal winding sleeve, with its inner edge and an outer, with possibility of connection to the movable auxiliary load or dynamic mechanism tensile dynamometer. 2. The stand according to claim 1, characterized in that the compression chamber is made with two tangential nozzles, one of which is connected to the test tube, the second to the pneumatic shutter. 3. The stand according to claim 1, characterized in that it contains a set of models of the studied pipes, each of which is made with differential characteristics and installed on the basis with the possibility of research, while the differential characteristics are material, pipe size and shape, the nature and size of pipe defects . 4. The stand according to claim 1, characterized in that it contains a set of samples of the studied sleeves, each of which is made with differential characteristics in diameter, length of the sleeve, material, thickness of the material, the number of layers, cladding and reinforcing materials and substances. 5. The stand according to claim 2, characterized in that the pipe under study and the tangential nozzles of the compression chamber are fixed coaxially on the stand base, and the horizontal axes of the pipe, tangential nozzles, pneumatic shutter cuff, tensile dynamometer, upper level of the block wheel chute are located at the same level from the base of the stand. 6. The stand according to claim 4, characterized in that the set of models of the studied pipes is equipped with a set of interchangeable nozzles made with the possibility of tight connection of the pipe and sleeve with a compression chamber. 7. The stand according to claim 6, characterized in that the set of models of the studied pipes is equipped with a set of interchangeable nozzles made with the possibility of hermetically connecting the pipe to the compression chamber telescopically. 8. The stand according to claim 1, characterized in that the hydraulic recirculation system is made in the form of a storage tank equipped with hoses, a pump unit, shutoff valves, a heater, instrumentation, a computer. 9. The stand according to claims 1, 6, characterized in that the compression chamber, interchangeable nozzles, the pneumatic shutter housing are made of steel. 10. The stand according to claims 1, 6, characterized in that the compression chamber, interchangeable nozzles, the pneumatic shutter housing are made of reinforced fiberglass.

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