RU2459137C2 - Method to restore pipelines and device for its realisation - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: coating is applied onto a pipeline into several layers, the pipeline is vacuumised prior to application of a new layer, and the coating is impregnated after application. The method is realised with a device made of two chambers with drums and sleeves equipped with facilities to pull vacuum and impregnate the applied solution.

EFFECT: possibility to restore various pipelines with lower costs and in a shorter period of time.

3 cl, 5 dwg

Description

The invention relates to construction and can be used in the construction and repair of pipelines.

A known method of coating the inner surface of the pipeline, when the coating composition is moved through the pipeline and the surface of the pipeline is coated with it, for example, a.s. USSR No. 1041179, B22F 7/04, 1981 or WO 86/02425 A1, 04.24, 1986

The disadvantage of this method is that they work well with adhesives with good fluidity. When using this method on cement-sand mixtures, their separation occurs.

Known devices for coating the inner surface of the pipeline, consisting of a fluid agent supply system, a coating mechanism, for example, EPO patent No. 0082212, class. F16L 55/16, 1981, A.S. No. 730379, cl. B05C 7/08, 1980, patent RU No. 20155746, B05C 7/08, 1994, and.with. USSR No. 1512682, cl. B05C 1 / 08.1989, A.S. USSR No. 1445810, class B05C 1/08, 1988

The disadvantage of these devices is that they are not very effective when applying a cement-sand mixture.

The closest prototype is a method for cleaning pipelines, a method for coating pipelines and devices (options) for its implementation, RU 2358186 C2, class. F16L 58/04.

The disadvantages of this method and device are the need to stop the pipeline for the duration of the repair work.

Despite the excellent technical characteristics of the above methods and devices, these inventions also have a number of significant disadvantages:

- the complexity of the work;

- insufficient coating strength;

- high consumption of materials;

- low speed of work.

The objective of the invention is to increase the strength of the coating with reduced costs.

The problem is achieved by the combined use of the group of inventions.

The implementation of the coating sequentially in both directions reduces the time to complete the work and reduce the preparatory operations and the amount of equipment.

The application of several layers of coating in succession can increase strength.

Evacuation of the pipeline increases the strength of the coating, its corrosion resistance.

Impregnation of the applied coating allows to increase the strength and durability of the coating and reduce its roughness.

The connection of the chamber to the ends of the pipeline simplifies the design and reduces labor costs.

The drawings show:

figure 1 - device for coating;

figure 2 - device with an additional camera;

figure 3, 4, 5 - torus elements.

The device shown in Fig. 1 is made of two chambers 1 installed at the ends of the pipeline 6, in each of which a drive reversing drum 2 with a sleeve 3 is installed, the end of which is bent and fixed around the perimeter of the chamber 1, and forms a cavity 4 in communication with fluid supply system 5. The pipeline 6 is in communication with the solution supply system 7 and nozzles for its outlet 8, 9, as well as the check valve 10 and the impregnation solution supply system 11.

The device shown in figure 2, is made similar to the device shown in figure 1, only the camera (coil) 12 is added, fixed with a torus element 13.

The device shown in Fig.3 is made of a pipeline 6 and a torus 14, the cavity 15 of which is filled with a fluid agent.

The device depicted in figure 4, is made of a pipeline 6 and a torus 14, enclosed between the pipeline 6 and a pipe segment 16 of larger diameter. The cavity 15 of the torus 14 is filled with a fluid agent. Chambers 1 with drums 2 and sleeves 3 and with an impregnation solution supply system 11 and check valves 10 perform, in addition to the function of applying the solution, additional functions: evacuation and impregnation of the applied solution, i.e. are means of evacuation and impregnation of the applied solution.

The device shown in Fig. 5 is made of a pipeline 6 and a torus 14, enclosed between the glass 17 and two movable flanges 18 and 19. The cavity 15 of the torus 14 is filled with a fluid agent.

The device depicted in figure 1, operates as follows.

Sleeves 3 of both chambers 1 are in contact with each other. The system 7 serves the solution in the pipeline 6. The drums 2 move the sleeves from each other. The resulting cavity in the pipeline is filled with a solution. After the entire portion of the solution is fed into the pipeline 6, the system 7 is closed. After this, the sleeves 3 are synchronously moved to either side (left, right). Sleeves 3, moving, apply a layer of solution to the surface of the pipeline 6. After the sleeves 3 have come to the extreme position and all excess solution has been squeezed out of the pipeline 6 through the pipe 8, the sleeve 3 is left in the pipeline until the solution solidifies (i.e., until loss of fluidity solution). After this, the sleeves 3 are again moved to the solution supply system 7, which is used to pump a new portion of the solution into the pipeline between the sleeves 3. Then the sleeves 3 are synchronously moved in the opposite direction. After they arrive at the pipe 9, the sleeves are left under pressure in the pipeline until the solution solidifies. After that, moving the sleeve 3 along the pipeline 6 back and forth, vacuum the pipeline 6. The gas and steam released from the solution are periodically removed through the check valve 10. When the sleeve 3 exits the pipeline 6, a vacuum is created in it. Gas and steam exit the deposited solution and fill the cavity of the pipeline 6. At the entrance of the sleeve 3 to the pipeline 6, gas and steam are squeezed out of the cavity of the pipeline 6 into the atmosphere through the non-return valve 10. Then, the following layers of the solution are applied similarly until the specified thickness of the solution is formed. After applying the specified coating thickness, it is impregnated with a special composition. Impregnation is as follows. The system 11 between the sleeves 3 in the pipeline 6 pump a given portion of the impregnating composition. Then the sleeves 3 are synchronously moved together with the impregnating composition to the opposite end of the pipeline 6. The impregnating composition is pressed into the applied coating.

The device depicted in figure 2, works similarly to the device depicted in figure 1. Only in the process of performing work do they control the technological process. For this purpose, after each cycle, the camera (coil) 12 is inspected, which is removed from the pipeline 6. The installation (removal) of the camera (coil) 12 is carried out as follows. The tori 14 are rolled from the chamber (coil) 12 and removed. To install the chamber 12, the tori 14 are rolled onto the chamber 12. To create high pressures in the pipeline, the torus 14 is additionally compressed by movable flanges 18, 19.

Example

Steel pipe опровод1020 mm and a length of 600 m with fistulas was restored. The work was carried out by the device depicted in figure 1. Two sleeves were made of silicone rubber 1 mm thick and 605 m long.

The water supply was restored by applying a layer of cement-sand mortar to its inner surface with the addition of basalt fiber in an amount of 0.8% of the solution volume. After applying a cement-sand mortar, it was impregnated with an organosilicon composition.

The work was carried out in three stages.

Initially, the pipeline was plugged by extruding the solution by sleeves through the fistula into the soil surrounding the pipeline, as well as applying a layer of the solution with a thickness of 1-2 mm. The pressure of the compressed air in the sleeves was maintained at 0.5-0.6 MPa. After solidification of the solution, which was kept under pressure for 12 hours, the pipeline was evacuated by fourfold movement through the pipeline of the left sleeve.

Then a second cycle of work was carried out, which was characterized in that the dose of the solution pumped into the pipeline was doubled, and the pressure in the arms was maintained in the range of 0.8-1.0 MPa. After holding the sleeve in the pipeline under a pressure of 1.0 MPa for 16 hours, the applied cement-sand mortar was impregnated with an organosilicon composition, which was pumped into the pipeline between the sleeves at the right end of the pipeline and moved to the left end of the pipeline at a speed of 0.03 m / from. The pressure of the compressed air in the sleeves during movement was kept in the range of 0.9-1.0 MPa.

After the sleeves arrived at the left end of the pipeline, the right sleeve was kept in the pipeline under a pressure of 1.0 MPa for 24 hours. After that, the cameras were dismantled. The thickness of the applied coating was determined, which was 4.5-5.0 mm.

Then they tested the pipeline for tightness and strength. The strength of the pipeline corresponded to the strength of the pipeline made of the new pipe.

Hydraulic losses decreased by 10% compared to the new pipeline.

The use of the invention allows to restore various pipelines with lower costs and in a shorter time.

Claims (3)

1. The method of restoration of pipelines, which consists in applying the solution to the inner surface of the pipeline by feeding the solution into the pipeline, into the cavity formed by the sleeves, and in applying the solution to the inner surface of the pipeline by moving the sleeves and the solution through the pipeline, characterized in that the movement of the sleeves and the solution left or right, and after the hoses come to the extreme position, the excess solution is squeezed out of the pipeline, and after the solution has hardened, the hoses are moved to the feed system the solution, which is pumped into the pipeline between the sleeves, a new portion of the solution, after which the sleeves are moved in the opposite direction and after they reach the extreme position of the sleeve are left under pressure in the pipeline until the solution hardens, after which the pipeline is vacuum-backed and moved, and a new layer of solution is applied , after applying a given coating thickness, it is impregnated with an impregnating composition, and the impregnation is carried out by moving the hoses and the impregnating composition through the pipeline. 2. A device for restoring pipelines made of chambers installed at opposite ends of the pipeline, which are equipped with a fluid agent supply system, the pipeline being in communication with a solution supply system, characterized in that it is additionally equipped with nozzles for draining the solution, which are installed on both sides solution supply system, while the device is additionally equipped with a feed system of the impregnating composition and a check valve. 3. The device according to claim 2, characterized in that it is additionally equipped with a camera, which is connected to the pipeline by a torus element.

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