Method and device for repairing pipeline

FIELD: pipeline construction.

SUBSTANCE: method comprises applying interrupted layer of concrete-sand coating along the section of the pipeline to be repaired, allowing the layer to solidify, and applying the coating throughout the length of the pipeline section to be repaired. The coating mixture is supplied through the step hose thus allowing the thickness of the coating to be up to 400 mm for the diameter of the pipeline up to 5000 mm.

EFFECT: enhanced reliability.

2 cl, 5 dwg

 

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

There is a method of coating the internal surface of the pipeline when the pipeline move the covering composition, and they cover the surface of the pipeline, for example, AS the USSR №1041179, 22 F7/04, 1981 or WO 86/02425 A1, 24.04.1986,

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

The known device for coating the internal surface of the pipeline, consisting of a fluid supply system agent, the mechanism of coating, for example, EPO patent No. 0082212, CL F 16 L 55/16, 1981, A.S. No. 730379, CL In 05 With 7/08, 1980, patent RU NO. 20157465 IN 05 WITH 7/08, 1992, patent RU NO. 2015742 IN 05 WITH 1/08, 1992, A.S. USSR №1512682, CL In 05 With 1/08, 1989, A.S. USSR №1445810, CL In 05 With 1/8 1988 he

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

The closest analogue to the proposed method and device is "the best Way to clean the pipelines, the method of coating pipes and devices (options) for their implementation", EN 2184902 C2, CL 7 F 16 L 58/04.

The disadvantages of these methods and devices is that they are not suitable for use in the piping diameter is ω more than 500 mm, a very small thickness of the applied coating, the complexity of technologies and devices.

The objective of the invention is to increase the speed of coating and the thickness of the coating.

This object is achieved by the totality of applicable inventions. The coating is applied in several stages, you can increase the speed of coating, as it is possible to apply a less viscous mixture. The initial application of a discontinuous coating layers allows you to adjust the thickness of the coating and apply a coating thickness of 5-200 mm, while the diameter of the pipeline may be in the range of 100-5000 mm secondary coating over the whole length allows you to get high-quality coverage with great speed and greater thickness.

The device of the Cam sleeve, delivery systems, fluid agent and mixtures and execution of the stepped sleeve allows you to form a coating of greater thickness with greater speed. The use of two cameras can improve the quality of the coating, to increase its strength and to increase the length of the covered pipeline. The simultaneous use of two hoses of the same diameter allows to provide a smooth coating layer.

On the submitted drawings shows:

- figure 1 is a camera with a sleeve;

- figure 2 is a stepped sleeve;

- figure 3 - the implementation of the first phase of the coating;

- what and figure 4 - the execution scheme of the second stage cover;

- figure 5 - diagram restored pipeline.

The device shown in figure 1, is made of cells 1 connected to the ends of the pipeline 10, each of which is placed the drive reversing drum 2 - pulling device with a wound on his sleeve 3, the front end 4 of which is bent, mounted on the perimeter of the camera 1 and forms a hermetically sealed cavity, and the second end of the sleeve is connected with a traction device 2, and the cavity formed by the bent section of the sleeve provided with the system 5 feed fluid agent. Camera 1 is in communication with the system 5 supply current agent and system 6 of the feed mixture. The sleeve 3 shown in figure 2, is made of sections of different diameters, which are interconnected.

The diameter of section 8 of the sleeve is less than the internal diameter of the pipeline to double the thickness of the coating. The diameter of section 9 of the sleeve is larger than the diameter of the pipeline at 1-5 mm or equal to the inner diameter of the pipeline.

A device for applying the first coating, is shown in figure 3, is made of camera 1 installed on both ends of the pipeline 10. On the left drum 2 is wound stepped sleeve 3, and the right reel 2 wound around the sleeve 3, having a diameter equal to the diameter of the pipeline 10.

A device for applying the second coating is shown in figure 4. Both drum is 2 wound sleeve 3, having the same diameters, the diameter equal to D=D1-2h, where

D - outer diameter of the sleeve;

D1- internal diameter of the pipeline;

h is the thickness of the coating.

Example.

Recovered steel tubing for potable water ⊘ 500 mm and a length of 300 meters

The pipeline had end-to-end fistula. The pipeline was cleaned from sediments. Manufactured from polyurethane four sleeves. The thickness of the sleeve 1 mm Length sleeveless 310 m the End of each arm of the tape is connected with the driving drum 2.

A stepped sleeve 3 is made of sections ⊘ 500 mm and ⊘ 480 mm length 10 m

Made two sleeves ⊘ 480 mm length 310 m

Made one sleeve ⊘ 500 mm length 310 m

The floor was made of cement-sand mixture with the type.

At the ends of the pipe 10 mounted camera 1. On the left drum is wound a stepped sleeve 3. On the right reel is wound sleeve 3 with a diameter of 500 mm Right sleeve 3 by means of compressed air has moved into the left end of the pipe. After that, the system 6 was applied to the camera 1 cement-sand mixture.

Right sleeve 3 out of the pipeline 10. After the mixture was fed into the pipeline, the left sleeve 3 has begun to enter into the pipeline 10, and the right sleeve 3 output from the pipeline 10. Compressed air pressure in the left chamber was 0.6 MPa, and the pressure in the right chamber was 0.5 MPa After both sleeves 3 have reached the right end of the pipe 10, the right camera 1 was dismantled. The left sleeve 3 any excess mixture is dispensed from the pipeline 10.

The left sleeve 3 under the pressure of 0.6 MPa was kept for 28 hours before curing of the mixture.

After that, the left sleeve 3 were taken out of the pipeline 10 by rotation of the drum 2. Compressed air from the chamber 1 was released into the atmosphere.

The left camera 1 dismantled from the pipe 10.

Then on the ends of the pipe 10 mounted camera 1 with sleeves ⊘ 480 mm

Right sleeve 3 is introduced to the left sleeve 3.

System 6 into the space between the arms 3 of the pumped portion of the mixture, the right sleeve 3 thus taken out of the pipeline 10.

After the filing of the whole mixture in the pipe 10 it began to enter the left sleeve 10 under a pressure of 0.6 MPa compressed air, and the right sleeve 3 output from the pipeline 10.

Compressed air pressure in the right chamber 1 was maintained to 0.5 MPa. Once both sleeves 3 have come to the right camera 1, it was dismantled.

The left sleeve 3 is dispensed from the pipeline all the mixture. After that, the left sleeve 3 has stood in the pipeline 10 to the curing of the mixture.

Then the left sleeve 3 were taken out of the pipeline 10 and dismantled the left camera 1.

The pipeline was tested on strength and tightness and put into operation.

The use of the invention allows to restore the pipeline the odes diameter 100-5000 mm and apply a coating thickness of from 5 to 400 mm

The strength of the coating with this method of applying increases to 50%.

1. Method of recovery of pipelines, including cleaning of the pipeline from deposits, plugging the annulus of the pipe, the coating on the inner surface of the pipeline, characterized in that the coating is carried out in several stages: initially on the entire inner surface of the pipeline is applied interrupted the coating layer, the coating utverjdayut and then coated the entire length of the pipeline.

2. Device for coating the internal surface of the pipeline, made of cameras connected to the ends of the pipeline, each of which is placed a sleeve, the front end of which is bent and forms a hermetically sealed cavity, and the second end of the sleeve is connected with a traction device, and the cavity formed by the bent section of the sleeve is provided with a fluid supply system agent, and the device is equipped with a system of feed of the mixture to cover the inner surface of the pipe, which communicates with the cavity of the pipeline located in front of the twisted end of the sleeve, wherein one of the sleeves is made with the same diameter throughout the length of the sites or different diameters, connected in series with each other.



 

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