CN116428449A - A connection method and connection structure after anti-corrosion in a pipeline - Google Patents

Abstract

The invention relates to a method for connecting a pipeline after corrosion prevention and a connecting structure thereof, which are characterized in that the pipeline to be repaired is cleaned, a hose is turned into the pipeline, a lining repair hose is cut flat at an outlet, inner wall hoses at two ends are cut off by 3-6 cm to obtain the repaired pipeline, conical short pieces are respectively arranged at two ends of the pipeline and fixed by using special glue, and then the conical short pieces are connected and fixed by using stainless steel short pipes to finish the connection after corrosion prevention in the pipeline. According to the method and the structure for connecting the pipeline after corrosion prevention, after the conical short-cut is adopted for connection with the stainless steel short-cut pipe, the film coating in the pipe cannot be damaged, and meanwhile the problem of corrosion at the joint of the pipe orifice is solved. The design life can be reached after the pipe network is repaired.

Description

A connection method and connection structure after anti-corrosion in the pipeline

technical field

The invention belongs to the connection structure of pipelines, in particular to a connection method and connection structure after anti-corrosion in pipelines.

Background technique

After the pipe network has been used for a certain number of years, it is necessary to carry out anti-corrosion treatment on the inside. The commonly used method is the flipping method, which is to use the flipping machine to turn the resin layer of the hose to the fiber reinforced hose with an impervious layer and impregnated with thermosetting resin Attached to the inner wall of the old pipe, the impermeable layer becomes the inner wall surface of the new pipe. The adhesive on the liner is cured by heating or room temperature curing to form a firm steel-plastic composite pipe. Due to the limited length of repairing old pipes lined with glass fiber reinforced plastics by flipping method, it often takes several repairs to complete an old pipe, so there is a problem of connecting the ends of two adjacent pipe sections, and the ends of the repaired two adjacent pipe sections The structure of the connection has a great influence on the service life of the pipeline. The existing end connection method is to weld the pipe sections after pairing. Due to the high temperature of the joints, the original anti-corrosion layer will be destroyed, so that the anti-corrosion joints of the overall pipe network cannot achieve the effect of internal and external anti-corrosion. , the anti-corrosion system at the weld is the first to be destroyed during use, which affects the service life. The announcement number is CN104089145B, and the name is a new technology for rapid curing and repairing anticorrosion of buried pipelines lined with glass fiber reinforced plastics for long distances online. It discloses a welding method at the fracture of pipelines after pipeline corrosion. The problem of high damage to the anti-corrosion layer, but its connection process is complicated and the operation is cumbersome.

Contents of the invention

The invention aims at overcoming the deficiencies of the prior art, and provides a connection method and a connection structure after anti-corrosion in the pipeline.

The invention relates to a connection method after anti-corrosion inside the pipeline. The pipeline to be repaired is cleaned and processed, and then the hose is turned into the pipeline, and the lining repair hose is cut flat at the outlet to obtain the repaired pipeline. Include the following steps:

(1) Cut off the stainless steel short connection pipe with the same diameter as the pipeline I and pipeline II to be connected, the length of the stainless steel short connection pipe is 8-12 cm, and spare;

(2) Cut off the inner wall hoses at both ends of the repaired pipeline I and pipeline II by 3 to 6 cm, and clean them up;

(3) Put the tapered short-cut Ⅰ and the tapered short-cut Ⅱ into the two ends of the pipe Ⅰ and pipe Ⅱ which have been processed in the steps, fix them with special glue, and clean them up;

(4) Weld and fix the two ends of the pipes to be connected, the conical short-span I and the conical short-span II, respectively, to the two ends of the stainless steel short-joint pipe, and connect after completing the anti-corrosion in the pipe;

(5) Apply an anti-corrosion paint layer on the outer wall of the connected pipe network, and then apply a nano-based insulation layer material.

As a further improvement of the present invention, the major diameter of the stainless steel short pipe and the conical short pipe is the same as the diameter of the pipe network to be connected.

The anti-corrosion connection structure in the pipeline of the present invention is that the hose I and the hose II are respectively pasted in the pipeline I and the pipeline II, and the two ends of the hose I and the hose II are shorter than the pipeline I It is 3 to 6 cm away from the pipe II, and a stainless steel short joint of the same diameter is provided between the pipe I and the pipe II, and the two ends of the stainless steel short joint are respectively provided with a tapered short joint I and a tapered short joint II integrated with it. The taper-shaped short-gut I and the conical short-gut II on the side are respectively placed in the pipe I and the pipe II for fixed connection.

As a further improvement of the present invention, a special adhesive layer is filled in the space formed by the tapered shorts, pipes and hoses.

As a further improvement of the present invention, an anti-corrosion paint layer and a nano-based insulation layer are sequentially coated on the outside of the pipeline I, the conical short I, the stainless steel short joint, the conical short II and the pipeline II.

As a further improvement of the present invention, the thickness of the anti-corrosion paint layer is 0.5-2 mm.

As a further improvement of the present invention, the thickness of the nano-based thermal insulation layer is 1-3 cm.

A connection method and connection structure after anti-corrosion in the pipeline of the present invention, after the connection is carried out by using a conical short pipe and a stainless steel short connection pipe, the coating film in the pipe will not be damaged, and at the same time, the problem of corrosion at the joint of the pipe mouth is solved. After the pipe network is repaired, it can reach the design life.

Description of drawings

Fig. 1 is a schematic structural view of the present invention.

Implementation

Example 1

A connection method after anti-corrosion in the pipeline of the present invention comprises the following steps:

(1) Clean and treat the pipeline to be repaired, then turn the hose into the pipeline through the turning machine, and cut the lining repair hose flat at the outlet to obtain the repaired pipeline;

(2) Cut off the inner wall hoses at both ends of the repaired pipeline I1 and pipeline II2 by 5 cm to make the hoses shorter than the pipelines, and clean both ends;

(3), cut off the stainless steel short connection pipe 5 with the same diameter as the pipeline I1 and pipeline II2 to be connected, the length of the stainless steel short connection pipe 5 is 10 cm, and spare;

(4) The two ends of the pipe Ⅰ1 and pipe Ⅱ2 processed in step (2) are respectively loaded with a conical short pipe I6 and a tapered short pipe II7, and the large diameter end of the tapered short pipe is the same as the diameter of the stainless steel short joint. , Insert the front end of the conical short urn into the pipe so that the outer ring surface of the front end of the conical short urn is against the hose, and the outer ring surface of the rear end is against the pipe port, and fixed with special glue and cleaned;

(5) Weld and fix the tail ends of the conical short pipe I6 and the tapered short pipe II7 at both ends of the pipe to be connected to the two ends of the stainless steel short pipe 5 respectively, and connect after completing the anti-corrosion in the pipe;

(6) Apply an anti-corrosion paint layer 9 to 1 mm on the outer wall of the connected pipe network, and then apply a nano-based insulation layer 10.

Example 2

The anti-corrosion connection structure in the pipeline of the present invention is that the hose I3 and the hose II4 are respectively pasted in the pipeline I1 and the pipeline II2, wherein the two ends of the hose I3 and the hose II4 are respectively shorter than the pipelines I1 and II2. The pipe II2 is 5 cm, and a stainless steel short joint 5 of the same diameter is provided between the pipe I1 and the pipe II2, and the two ends of the stainless steel short joint 5 are respectively provided with a tapered short joint I6 and a tapered short joint II7 fixed integrally with it. , the tapered sections of the tapered short indium I6 and the tapered short indium II7 on both sides are respectively placed in the pipeline I1 and the pipeline II2 for fixed connection. Make the outside of the rear end of the tapered short urn abut against the pipe, and the front end abut against the hose and fill the space formed by the tapered short urn, the pipeline and the hose with a special glue layer 8. The special adhesive layer 8 is 3MDP490 high temperature resistant epoxy resin structural adhesive.

The anti-corrosion coating layer 9 and the nano-based insulation layer 10 are sequentially coated on the outside of the pipeline I1, the conical short-gut I6, the stainless steel short-connector 5, the conical short-gut II7 and the pipeline II2. The thickness of the anticorrosion paint layer 9 is 1 mm, which is rust conversion paint.

The thickness of described nano-base insulation layer 10 is 2 centimetres, is to be made according to the following steps by following components:

a. At 20°C, stir 30 parts of perlite, 25 parts of aluminosilicate fiber, 20 parts of wood fiber and 1.5 parts of water until it becomes a paste;

b. Heat up to 22°C, add 6 parts of kaolin to the mixture in step a and stir quickly until it becomes a paste;

c. Let the mixture in step b stand for 4 hours, and at 20°C, add 15 parts of pearlescent sand, 13 parts of floating beads, 18 parts of brucite fiber and 0.5 part of water and stir until it becomes a paste;

d. Raise the temperature to 23°C, add 15 parts of bentonite to the mixture in step c, stir until it becomes a paste, and let it stand for 40 hours to obtain a finished coating; the above-mentioned parts are parts by weight.

Claims (7)

1. A connection method after anti-corrosion in the pipeline. After cleaning the pipeline to be repaired, the hose is turned into the pipeline, and the lining repair hose is cut flat at the outlet to obtain the repaired pipeline. Its characteristics It also includes the following steps: (1), cut off the stainless steel short connection pipe (5) with the same diameter as the pipeline I (1) and pipeline II (2) to be connected, the length of the stainless steel short connection pipe (5) is 8-12 cm, and spare; (2) Cut off 3-6 cm from the inner wall hose I (3) and hose II (4) at both ends of the repaired pipeline I (1) and pipeline II (2), and clean them up; (3) Put the tapered short-sleeve I (6) and the tapered short-sleeve II (7) into the two ends of the pipeline I (1) and pipeline II (2) processed in step (2) respectively, and use a special The glue is fixed and cleaned up; (4) Weld and fix the tapered short pipe I (6) and tapered short pipe II (7) at both ends of the pipe to be connected to the two ends of the stainless short pipe (5) respectively, and connect after completing the anti-corrosion in the pipe; (5) Apply an anti-corrosion paint layer (9) on the outer wall of the connected pipe network, and then apply a nano-based insulation layer (10). 2. The connection method after anti-corrosion in a kind of pipeline as claimed in claim 1, characterized in that the major diameter of the stainless steel short joint and the tapered short are identical to the diameter of the pipe network to be connected. 3. A connection structure after anti-corrosion in the pipeline, which is respectively coated with the hose I (3) and the hose II (4) in the pipeline I (1) and the pipeline II (2), which is characterized in that the hose I ( 3) and both ends of the hose II (4) are 3-6 cm shorter than the pipe I (1) and the pipe II (2), and there is a stainless steel pipe of the same diameter in the middle of the pipe I (1) and the pipe II (2). The short connection pipe (5), the two ends of the stainless steel short connection pipe (5) are respectively provided with a conical short yoke Ⅰ (6) and a tapered short yoke II (7) which are fixed integrally with it, and the tapered short yoke II (7) on both sides (6) and the tapered short urn II (7) are respectively placed in the pipeline I (1) and the pipeline II (2) for fixed connection. 4. A post-corrosion connection structure in pipelines according to claim 3, characterized in that the space formed by the tapered shorts, pipelines and hoses is filled with a special glue layer (8). 5. A connection structure after anti-corrosion in pipelines as claimed in claim 3, characterized in that the pipeline I (1), the conical short urn I (6), the stainless steel short joint (5), the conical short urn II ( 7) and pipeline II (2) are sequentially coated with anti-corrosion paint layer (9) and nano-based insulation layer (10). 6. The connection structure after anti-corrosion in the pipeline according to claim 5, characterized in that the thickness of the anti-corrosion coating layer (9) is 0.5-2 mm. 7. A connection structure after anti-corrosion in pipelines according to claim 5, characterized in that the thickness of the nano-based insulation layer (10) is 1-3 cm.

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