CN114508644A - Pipeline repairing process and repaired pipeline - Google Patents
Pipeline repairing process and repaired pipeline Download PDFInfo
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- CN114508644A CN114508644A CN202011281635.5A CN202011281635A CN114508644A CN 114508644 A CN114508644 A CN 114508644A CN 202011281635 A CN202011281635 A CN 202011281635A CN 114508644 A CN114508644 A CN 114508644A
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/168—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe
- F16L55/175—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by using materials which fill a space around the pipe before hardening
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a pipeline repairing process and a repaired pipeline, and belongs to the field of petrochemical industry. The pipeline repairing process comprises the following steps: processing a to-be-repaired area of the pipeline to expose a pipeline substrate in the to-be-repaired area; coating a mesh base on the outer surface of the pipeline substrate, wherein the mesh base comprises: the net-shaped body and the reinforcing seat are positioned at each mesh hole of the net-shaped body; installing the reinforcing block on the reinforcing seat in a non-welding mode, and matching the reinforcing block with the reinforcing seat to form a reinforcing mechanism; and (3) coating the structural adhesive to fill the structural adhesive among the pipeline base material, the reticular base and the reinforcing block, and forming a repair sleeve after the structural adhesive is cured to finish repairing the to-be-repaired area of the pipeline. The process is simple and convenient to construct and operate and high in applicability, and the prepared repair sleeve has excellent bending resistance.
Description
Technical Field
The invention relates to the field of petrochemical industry, in particular to a pipeline repairing process and a repaired pipeline.
Background
Due to the particularity of pipeline laying, factors such as soil corrosion, landslide and external force damage can cause pipeline defects to a certain extent, and especially, the pipeline at the bent part of various large-diameter pipes is easy to cause pipe wall defects due to construction inconvenience and stress concentration. If the pipeline defects are not repaired in time, pipeline accidents may occur.
The related technology provides a defect repairing process for a composite material steel sleeve pipe body, fiber composite materials are manually wound outside a pipeline, after resin is cured, the fiber composite materials are tightly combined with the defective pipeline and deform in a coordinated mode, meanwhile, the steel sleeve is welded on site to be fastened and reinforced, stress of the defective pipeline is distributed reasonably, and therefore the purpose of reinforcement is achieved.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
the defect repairing process for the composite material steel sleeve pipe body provided by the related technology has the problems that the construction and installation operation of the steel sleeve is difficult, the repairing effect is not durable due to the fact that a fiber composite material is easy to age, and the like.
Disclosure of Invention
In view of the above, the present invention provides a pipeline repairing process and a repaired pipeline, which can solve the above technical problems.
Specifically, the method comprises the following technical scheme:
in one aspect, an embodiment of the present invention provides a pipeline repairing process, where the pipeline repairing process includes: processing a to-be-repaired area of the pipeline to expose a pipeline substrate in the to-be-repaired area;
coating a mesh base on the outer surface of the pipe substrate, wherein the mesh base comprises: the net-shaped body and the reinforcing seat are positioned at each mesh hole of the net-shaped body;
installing a reinforcing block on the reinforcing seat in a non-welding mode, wherein the reinforcing block is matched with the reinforcing seat to form a reinforcing mechanism;
and coating structural adhesive to fill the structural adhesive among the pipeline base material, the reticular base and the reinforcing block, and forming a repair sleeve after the structural adhesive is cured to finish repairing the to-be-repaired area of the pipeline.
In some possible implementations, the mesh body is made of steel wire rope, helical wire bundle, diamond-shaped wire rope mesh, annular mesh, or steel wire grating.
In some possible implementations, the mesh body is made of synthetic resin, rubber, graphite sheet, carbon fiber sheet, glass fiber, carbon fiber, boron fiber, aramid fiber, silicon carbide fiber, or asbestos fiber.
In some possible implementations, the reinforcing seat is connected with the mesh of the mesh body by welding or hot-melt connection.
In some possible implementations, the reinforcing seat has a mounting cavity adapted to the reinforcing block structure, and the reinforcing block is mounted in the mounting cavity in a non-welding manner.
In some possible implementations, the reinforcing block is mounted in the mounting cavity by clamping, bolting, cardan joint or riveting.
In some possible implementations, the material of the reinforcing seat and the reinforcing block is selected from alloy steel or ultra-low carbon steel with yield strength greater than 580MPa and tensile strength greater than 600 MPa.
In some possible implementation manners, the materials of the reinforcing seat and the reinforcing block are selected from composite materials, and the tensile yield strength of the composite materials is greater than or equal to 100MPa, the tensile modulus is greater than or equal to 2000MPa, the elongation at break is less than or equal to 2%, the bending modulus is greater than or equal to 3000MPa, and the bending strength is greater than or equal to 150 MPa.
In some possible implementations, the pipe repair process further includes: and winding carbon fiber cloth or glass fiber cloth pre-impregnated with epoxy resin on the outside of the repair sleeve.
On the other hand, the embodiment of the invention also provides a repaired pipeline, and the repaired pipeline is prepared by adopting any pipeline repairing process.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
according to the pipeline repairing process provided by the embodiment of the invention, the mesh base is used for coating the surface of the pipeline base material at the position of the area to be repaired, and the bending resistance of the repairing sleeve can be improved by utilizing the characteristics of high strength and bending resistance of the mesh base. On the basis, the reinforcing block is arranged on the reinforcing seat, so that the strength of the repairing sleeve can be further improved; the gap between any two of the pipe substrate, the mesh base and the reinforcing block is filled with the structural adhesive, so that the internal pressure resistance of the repair sleeve can be further optimized. Because the reinforcing block can adopt non-welding mode to install on strengthening the seat for the telescopic construction operation of restoration is easier and convenient. Therefore, the pipeline repairing process provided by the embodiment of the invention is simple and convenient in construction operation and strong in applicability, and the prepared repairing sleeve has excellent strength and bending resistance, and can realize 100% recovery, so that the internal pressure resistance of the repaired pipeline exceeds the yield strength of the pipeline, and the service life is longer.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a pipeline rehabilitation process provided by an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an exemplary mesh base and reinforcing blocks according to an embodiment of the invention.
The reference numerals denote:
101-a mesh-like body, which is,
102-a mesh of the mesh, and the mesh,
103-a reinforcing seat, wherein the reinforcing seat is provided with a plurality of reinforcing ribs,
104-the mounting cavity is provided with,
105-a card slot, which is provided with,
2-a reinforcing block, wherein the reinforcing block is a reinforcing block,
201-card table.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.
In one aspect, an embodiment of the present invention provides a pipeline repairing process, as shown in fig. 1, the pipeline repairing process includes the following steps:
step 1, processing a to-be-repaired area of the pipeline to expose a pipeline substrate in the to-be-repaired area.
And 3, mounting the reinforcing block on the reinforcing seat in a non-welding mode, wherein the reinforcing block and the reinforcing seat are matched to form a reinforcing mechanism.
And 4, coating the structural adhesive to enable the structural adhesive to be filled among the pipeline base material, the mesh-shaped base and the reinforcing blocks, and forming a repairing sleeve after the structural adhesive is cured to complete repairing of the to-be-repaired area of the pipeline.
The above-mentioned "filling the structural adhesive between the pipe base material, the mesh base, and the reinforcing block" means that the structural adhesive fills the gap between any two of the pipe base material, the mesh base, and the reinforcing block.
According to the pipeline repairing process provided by the embodiment of the invention, the mesh base is used for coating the surface of the pipeline base material at the position of the area to be repaired, and the bending resistance of the repairing sleeve can be improved by utilizing the characteristics of high strength and bending resistance of the mesh base. On the basis, the reinforcing block is arranged on the reinforcing seat, so that the strength of the repair sleeve can be further improved; the gap between any two of the pipe substrate, the mesh base and the reinforcing block is filled with the structural adhesive, so that the internal pressure resistance of the repair sleeve can be further optimized. Because the reinforcing block can adopt non-welding mode to install on strengthening the seat for the telescopic construction operation of restoration is easier and convenient. Therefore, the pipeline repairing process provided by the embodiment of the invention is simple and convenient in construction operation and strong in applicability, and the prepared repairing sleeve has excellent strength and bending resistance, and can realize 100% recovery, so that the internal pressure resistance of the repaired pipeline exceeds the yield strength of the pipeline, and the service life is longer.
The following steps involved in the embodiments of the present invention are described separately:
and (2) processing the to-be-repaired area of the pipeline in the step (1) to expose the pipeline base material in the to-be-repaired area, so that the repair sleeve obtained by subsequent preparation can be closely attached to the pipeline base material in the to-be-repaired area of the pipeline, and the repair effect is favorably improved.
By way of example, the processing at the to-be-repaired area of the pipeline includes: and removing the PE anticorrosive layer and the epoxy resin on the surface of the to-be-repaired area of the pipeline by using intermediate frequency heating equipment, and then removing the residual epoxy resin and part of rust on the pipe wall by adopting a sand blasting rust removing mode to expose the silvery white surface of the pipeline substrate.
The surface roughness of the pipeline base material reaches Ra2.5 grade, after rust removal is completed, the surface of the pipeline base material is swept by air, and then solvents such as absolute ethyl alcohol and the like are used for removing oil stains on the surface of the pipeline base material, so that the treatment of the to-be-repaired area of the pipeline can be completed.
The surface of the pipeline base material finally meets the treatment requirement of repairing the surface, and the construction of repairing the sleeve is required to be completed within 4-8 h so as to prevent rust.
For step 2, coating a mesh base on the outer surface of the pipe substrate, wherein the mesh base comprises: the net-shaped body and the reinforcing seat positioned at each mesh hole of the net-shaped body.
Illustratively, the wrapping the mesh base around the outer surface of the tube substrate includes: the mesh base is placed on the outer surface of the pipeline base material by using a hoisting device, the mesh base is wrapped around the outside of the pipeline base material, namely, the mesh base is wound on the outside of the pipeline base material, then the mesh base is tensioned by using a machine tool, redundant parts are removed, meanwhile, the lap joint width of lap joint parts at two ends is kept at 80mm-120mm, for example, 100mm, and then the lap joint part of the mesh base is fixed by adopting a spot welding mode.
After the coating operation of the mesh base on the surface of the pipeline base material is completed, the position of the mesh base is adjusted to be centered, that is, the central axis of the mesh base is coincident with the central axis of the pipeline base material, so that the mesh base is not obliquely positioned on the surface of the pipeline base material.
The removing method of the redundant part of the mesh base includes, but is not limited to: scissors cutting, flame burning, hobbing cutting, ring cutter progressive cutting, pipe cutter auxiliary cutting and the like.
In an embodiment of the present invention, a mesh base includes: the net-shaped body and the reinforcing seat positioned at each mesh hole of the net-shaped body.
The reticular base can be obtained by integrally manufacturing the reticular body and the reinforcing seat or independently manufacturing the reticular body and the reinforcing seat at each mesh hole of the reticular body.
In some possible implementations, the mesh-like body may be made of steel wires, helical wire bundles, diamond-shaped wire rope mesh, annular mesh, or steel wire grids.
The spiral wire bundle may be a wire rope, and the net-like body may be obtained by performing a net-forming operation using a wire or a spiral wire bundle.
The net-shaped body prepared by the above products has the advantages of high flexibility, high strength, easy preparation and the like, and is convenient for obtaining net-shaped bodies with various shapes.
In the embodiment of the invention, the elastic bending angle of the net-shaped body can reach 60-90 degrees at most.
In some possible implementations, the mesh-like body is made of synthetic resin (e.g., high-strength polyethylene or Aramid Fiber Reinforced Plastic (AFRP), etc.), synthetic resin, rubber, graphite sheet, glass fiber, carbon fiber, boron fiber, aramid fiber, silicon carbide fiber, or asbestos fiber.
The reticular body is prepared by utilizing the high molecular organic materials, and has higher strength and lighter weight on the premise of ensuring easy molding preparation.
In some possible implementations, the connection between the mesh body and the reinforcement seat includes, but is not limited to, the following: welding, hinged connection, bolt connection, sawtooth occlusion connection, brush surface pasting connection, hot melt connection, wavy key connection, sealing screw connection, hot buckling interference fit connection, universal joint connection, flat key connection, rivet connection and the like.
On the premise of ensuring that the reticular base has high strength and structural stability, in order to simplify the preparation process of the reticular base, in the embodiment of the invention, the reinforcing seat and the reticular body are both made of high-strength materials suitable for welding, and the reinforcing seat is connected with the meshes of the reticular body in a welding mode. Or the reinforcing seat and the reticular body are both made of high-strength materials suitable for hot melt connection, and the reinforcing seat is connected with meshes of the reticular body in a hot melt connection mode.
In the embodiment of the invention, the reinforcing block is installed in the reinforcing seat in a non-welding mode, in some possible implementation modes, the reinforcing seat is provided with an installation cavity matched with the structure of the reinforcing block, and the reinforcing block is installed in the installation cavity in a non-welding mode.
The structure of installation cavity and the structure looks adaptation of boss, like this, the boss is installed to the installation cavity inside after, and both surfaces can keep keeping flat, do benefit to like this and reduce the telescopic volume of restoreing.
For example, the mounting cavity is a rectangular cavity, and correspondingly, the reinforcing block is a rectangular block structure; the installation cavity is a circular or oval cavity, and correspondingly, the reinforcing block is a circular or oval block.
For the connection mode of the reinforcing block in the installation cavity, the following are included but not limited to: the reinforcing block is arranged in the mounting cavity through clamping, bolt connection, universal joint connection or rivet connection.
In the embodiment of the invention, the reinforcing block can be arranged in the mounting cavity in a clamping manner, so that the mounting efficiency of the reinforcing block can be obviously improved. In field application, the reinforcing block is installed by adopting a manual operation mode from the 12 o 'clock direction of the pipeline base material, and the reinforcing block is installed from two sides of the pipeline base material at the same time until the reinforcing block is converged in the 6 o' clock direction of the pipeline base material.
Fig. 2 illustrates an exploded view of the reinforcing mechanism, i.e. a schematic structural view of the mesh body 101, the reinforcing seat 103 and the reinforcing block 2 in a disassembled state. Referring to fig. 2, the structure of the reinforcing seat 103 is adapted to the mesh 102 structure of the mesh body 101, and the reinforcing seat 103 can be fixed in the mesh 102 by welding or by bolting (at this time, an installation platform is arranged outside the reinforcing seat 103, and the installation platform and the side wall of the mesh 102 are correspondingly provided with an internal threaded hole to connect with a fixing bolt, so as to fix the reinforcing seat 103).
The reinforcing block 2 is matched with the mounting cavity 104 of the reinforcing seat 103 in structure, and the reinforcing block and the reinforcing seat are connected in a clamping mode. For example, a plurality of card bodies 201 are arranged on the outer side of the reinforcing block 2 along the vertical direction, and the structures of the card bodies 201 are the same or different. Correspondingly, a plurality of clamping grooves 105 are correspondingly arranged on the inner wall of the mounting cavity 104 of the reinforcing seat 103, and the clamping grooves 105 are matched with the structure of the clamping body 201. When reinforcing block 2 is installed, reinforcing block 2 is located in installation cavity 104, and meanwhile, card body 201 on reinforcing block 2 enters into card slot 105, so that connection between reinforcing block 2 and reinforcing seat 103 is realized.
The reinforcing seat and the reinforcing block provided by the embodiment of the invention are made of high-strength steel or high-strength organic materials so as to ensure that the reinforcing mechanism formed by the reinforcing seat and the reinforcing block has high strength.
In some possible implementations, the material of the reinforcing seat and the reinforcing block is selected from alloy steel with yield strength greater than 580MPa and tensile strength greater than 600MPa or ultra-low carbon steel. Wherein, the ultra-low carbon steel refers to carbon steel with carbon content less than 0.03.
In other possible implementation manners, the reinforcing seat and the reinforcing block are made of composite materials, and the tensile yield strength of the composite materials is greater than or equal to 100MPa, the tensile modulus is greater than or equal to 2000MPa, the elongation at break is less than or equal to 2%, the bending modulus is greater than or equal to 3000MPa, and the bending strength is greater than or equal to 150 MPa.
For the above-mentioned composite material, the composite material is exemplified by polyvinyl chloride, glass fiber reinforced composite plastic, carbon fiber reinforced composite plastic, boron fiber reinforced composite plastic, ABS resin, polyoxymethylene thermoplastic crystalline polymer, PA46 (polytetramethylene adipamide), LCP engineering plastic, and the like.
In some possible implementations, any two adjacent reinforcing blocks may be connected to further improve the structural stability of the mesh base.
For the connection mode between two adjacent reinforcing blocks, including but not limited to: gluing, pin joining, welding, bolting, etc.
And 4, brushing the structural adhesive to fill the structural adhesive among the pipeline base material, the mesh base and the reinforcing block, and forming a repairing sleeve after the structural adhesive is cured to finish repairing the to-be-repaired area of the pipeline.
And curing the structural adhesive after brushing, wherein the curing time is more than or equal to 40 minutes, so that a better curing effect is obtained.
In the implementation of the invention, the epoxy resin bi-component material with the shear strength of more than or equal to 20MPa, the compressive strength of more than or equal to 50MPa and the adhesion to steel of more than or equal to 25MPa after actual drying is preferably used.
The curing time of the epoxy resin bi-component material is more than or equal to 40 minutes, the density is between 1.2 and 1.7, the hardness is 80 or more Shore D, the freeze-thaw cycle is in a temperature range from-30 ℃ to 0 ℃ to 30 ℃, and the hardness of the structural adhesive is unchanged within 200 hours.
Further, the pipeline repairing process provided by the embodiment of the invention further comprises the following steps: and carbon fiber cloth or glass fiber cloth pre-impregnated with epoxy resin is wound on the outside of the repair sleeve.
The carbon fiber cloth or the glass fiber cloth which is preimpregnated with the epoxy resin can further improve the repairing effect of the pipeline.
The preimpregnated epoxy resin can be an epoxy resin bi-component material with the shear strength of more than or equal to 18MPa, the compressive strength of more than or equal to 45MPa and the adhesion to steel of more than or equal to 20MPa after curing.
The curing time of the epoxy resin bi-component material is more than or equal to 60 minutes, the density is between 1.3 and 1.8, the curing hardness is 70 or above Shore D, the freeze-thaw cycle is in a temperature range from-30 ℃ to 0 ℃ to 30 ℃, and the hardness of the epoxy resin is unchanged within 200 hours.
When the pipeline is repaired on site, after the pipeline is repaired, the polyethylene cold winding belt is used for carrying out corrosion prevention on the sand blasting residual positions on the two sides, and finally the operation ditch is backfilled.
The pipeline repairing process provided by the embodiment of the invention adopts the modularized splicing type reinforcing mechanism, avoids the installation and construction of the reinforcing block in a welding mode, and has the advantages of simple and convenient construction operation, rapid construction, few process steps, simple installation process, high safety and applicability, 100% recovery of the bending resistance of the repairing layer, exceeding of the internal pressure resistance of the repaired pipeline over the yield strength of the pipeline and the like. The method has important significance for repairing the pipe body defects of the pipelines, particularly the high-steel-grade large-caliber pipelines.
On the other hand, the embodiment of the invention also provides a repaired pipeline, and the repaired pipeline is prepared by adopting any one of the pipeline repairing processes.
The embodiment of the invention provides a repair pipeline, which comprises: a repaired pipe segment, and a normal pipe segment other than the repaired pipe segment.
For a repaired pipe segment, comprising: the pipe comprises a pipe base material and a repair sleeve coated outside the pipe base material, wherein the repair sleeve is prepared by any one of the pipe repair processes related to the embodiment of the invention.
The following detailed description will be provided for the purpose of illustrating the embodiments and the advantageous effects thereof, and is not intended to limit the scope of the present invention.
Example 1
A certain natural gas pipeline of a certain pipeline company is made of X70 pipe steel with the outer diameter of 1016mm, 43% of fusion-free weld defects are found at a certain position, and after approval and record, the pipeline is stopped to be transported and emptied to replace natural gas.
And excavating a pipe ditch, removing the PE anticorrosive coating and the epoxy resin on the surface by using intermediate-frequency heating equipment, removing residual epoxy resin and part of rust on the pipe wall by adopting sand blasting to remove rust, and exposing the silver steel surface of the pipe base material at the area to be repaired to ensure that the surface roughness reaches the Ra2.5 level.
After rust removal is finished, the surface of the pipeline base material is swept by air, and then oil stains on the surface of the pipeline base material are removed by using solvents such as absolute ethyl alcohol and the like, so that the treatment on the area to be repaired of the pipeline can be finished. The surface of the pipe base material finally meets the treatment requirement of repairing the surface, and the construction of repairing the sleeve is required to be completed within 6h so as to prevent rust.
The outer surface of the pipeline base material is placed with the mesh base by the hoisting facility, the mesh base is wrapped around the outside of the pipeline base material, the mesh base is wound around the outside of the pipeline base material, then the mesh base is tensioned by a machine, redundant parts are removed by steel rope pliers, meanwhile, the lap joint width of lap joint parts at two ends is kept at 100mm, and then the lap joint of the mesh base is fixed by adopting a spot welding mode.
After the coating operation of the mesh base on the surface of the pipeline base material is completed, the position of the mesh base is adjusted, so that the central axis of the mesh base is overlapped with the central axis of the pipeline base material, and the mesh base is not obliquely positioned on the surface of the pipeline base material.
And (3) adopting a manual operation mode, starting to install and buckle the reinforcing blocks from the 12 o 'clock direction of the pipeline base material, and simultaneously installing from two sides of the pipeline base material until the reinforcing blocks are converged in the 6 o' clock direction of the pipeline base material. In this way, the reinforcing block can be attached to the reinforcing seat, and the reinforcing block and the reinforcing seat cooperate to form the reinforcing mechanism.
Wherein the net-shaped body is prepared from a diamond-shaped steel wire rope net, and the reinforcing seat and the reinforcing block are made of alloy steel with yield strength of more than 580MPa and tensile strength of more than 600 MPa. Strengthen inside the seat is fixed in each mesh of netted body through welding mode, as shown in fig. 2, strengthen the seat and have the rectangle installation cavity to, the boss of rectangle structure passes through the joint mode lock joint inside the rectangle installation cavity of strengthening the seat.
And (3) preparing a bi-component epoxy resin structural adhesive, and brushing the structural adhesive on the surface of the pipe within the operation time to fill the gap between any two of the pipeline substrate, the reticular base and the reinforcing block.
And winding carbon fiber cloth or glass fiber cloth preimpregnated with epoxy resin outside the repairing sleeve, then utilizing a polyethylene cold winding belt to carry out anticorrosion on the sand blasting residual positions on the two sides of the pipeline, and backfilling the operation ditch.
Wherein, the shear strength of the structural adhesive after being dried is 25MPa, the compressive strength is 60MPa, and the adhesion to steel is 30 MPa.
The preimpregnated epoxy resin has the shear strength of 30MPa, the compressive strength of 65MPa and the adhesion to steel of 35MPa after being dried.
Example 2
A certain natural gas pipeline of a certain pipeline company is made of X70 pipe steel with the outer diameter of 1016mm, 49% of fusion-free weld defects are found at a certain position, and after approval and record, the pipeline is stopped to be transported and emptied to replace natural gas.
And excavating a pipe ditch, removing the PE anticorrosive coating and the epoxy resin on the surface by using intermediate-frequency heating equipment, removing residual epoxy resin and part of rust on the pipe wall by adopting sand blasting to remove rust, and exposing the silver steel surface of the pipe base material at the area to be repaired to ensure that the surface roughness reaches the Ra2.5 level.
After rust removal is finished, the surface of the pipeline base material is swept by air, and then oil stains on the surface of the pipeline base material are removed by using solvents such as absolute ethyl alcohol and the like, so that the treatment on the area to be repaired of the pipeline can be finished. The surface of the pipe base material finally meets the treatment requirement of repairing the surface, and the construction of repairing the sleeve is required to be completed within 6h so as to prevent rust.
The net-shaped base is placed on the outer surface of the pipeline base material through a hoisting facility, the net-shaped base is wrapped around the outside of the pipeline base material, the net-shaped base is wound on the outside of the pipeline base material, then the net-shaped base is tensioned through a machine, redundant parts are removed through steel rope pliers, meanwhile, the lapping width of the lapping parts at two ends is kept at 100mm, and then the lapping position of the net-shaped base is fixed through a spot welding mode.
After the coating operation of the mesh base on the surface of the pipeline base material is completed, the position of the mesh base is adjusted, so that the central axis of the mesh base is overlapped with the central axis of the pipeline base material, and the mesh base is not obliquely positioned on the surface of the pipeline base material.
And (3) adopting a manual operation mode, starting to install and buckle the reinforcing blocks from the 12 o 'clock direction of the pipeline base material, and simultaneously installing from two sides of the pipeline base material until the reinforcing blocks are converged in the 6 o' clock direction of the pipeline base material. In this way, the reinforcing block can be attached to the reinforcing seat, and the reinforcing block and the reinforcing seat cooperate to form the reinforcing mechanism.
The net-shaped body is prepared from aramid fiber reinforced plastics, and the reinforcing seat and the reinforcing block are made of polyvinyl chloride with tensile yield strength of more than or equal to 100MPa, tensile modulus of more than or equal to 2000MPa, elongation at break of less than or equal to 2%, flexural modulus of more than or equal to 3000MPa and flexural strength of more than or equal to 150 MPa. The reinforcing seat is fixed inside each mesh of the net-shaped body in a bonding way through the brush surface. The reinforcing seat is provided with a circular mounting cavity, and the reinforcing block of the circular structure is buckled inside the circular mounting cavity of the reinforcing seat in a clamping mode.
And preparing a bi-component epoxy resin structural adhesive, and brushing the structural adhesive on the surface of the pipe within the operation time to fill the gap between any two of the pipeline base material, the reticular base and the reinforcing block.
And winding carbon fiber cloth or glass fiber cloth preimpregnated with epoxy resin outside the repairing sleeve, then utilizing a polyethylene cold winding belt to carry out anticorrosion on the sand blasting residual positions on the two sides of the pipeline, and backfilling the operation ditch.
Wherein the shear strength of the structural adhesive after being dried is 30MPa, the compressive strength is 65MPa, and the adhesion to steel is 35 MPa.
The preimpregnated epoxy resin has the shear strength of 35MPa, the compressive strength of 65MPa and the adhesion to steel of 37MPa after being dried.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A pipeline rehabilitation process, comprising: processing a to-be-repaired area of the pipeline to expose a pipeline substrate in the to-be-repaired area;
coating a mesh base on the outer surface of the pipe base material, wherein the mesh base comprises: the net-shaped body and the reinforcing seat are positioned at each mesh hole of the net-shaped body;
installing a reinforcing block on the reinforcing seat in a non-welding mode, wherein the reinforcing block is matched with the reinforcing seat to form a reinforcing mechanism;
and coating structural adhesive to fill the structural adhesive among the pipeline base material, the reticular base and the reinforcing block, and forming a repair sleeve after the structural adhesive is cured to finish repairing the to-be-repaired area of the pipeline.
2. The pipe repair process of claim 1, wherein the mesh body is made of steel wire rope, helical wire bundle, diamond wire rope mesh, annular mesh, or steel wire grating.
3. The pipe repair process of claim 1, wherein the mesh body is made of synthetic resin, rubber, graphite sheet, glass fiber, carbon fiber, boron fiber, aramid fiber, silicon carbide fiber, or asbestos fiber.
4. The pipe repair process according to claim 1, wherein the reinforcing seat is connected with the mesh of the mesh body by welding or hot-melt connection.
5. The pipeline repairing process according to claim 1, wherein the reinforcing seat is provided with an installation cavity matched with the reinforcing block structure;
the reinforcing block is installed in the installation cavity in a non-welding mode.
6. The pipe repair process of claim 5, wherein the reinforcing block is mounted in the mounting cavity by clamping, bolting, cardan joint or riveting.
7. The pipe repair process of claim 1, wherein the reinforcement base and the reinforcement block are made of a material selected from alloy steels or ultra-low carbon steels having a yield strength of greater than 580MPa and a tensile strength of greater than 600 MPa.
8. The pipeline repairing process according to claim 1, wherein the reinforcing seat and the reinforcing block are made of composite materials, and the composite materials have a tensile yield strength of not less than 100MPa, a tensile modulus of not less than 2000MPa, an elongation at break of not more than 2%, a flexural modulus of not less than 3000MPa and a flexural strength of not less than 150 MPa.
9. The pipe rehabilitation process according to any one of claims 1-8, further comprising: and winding carbon fiber cloth or glass fiber cloth pre-impregnated with epoxy resin on the outside of the repair sleeve.
10. A rehabilitated pipe, wherein the rehabilitated pipe is prepared by the pipe rehabilitation process of any of claims 1-9.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200378236Y1 (en) * | 2004-12-13 | 2005-03-11 | 윤지련 | A Repair Apparatus for Gutter Lining |
| CN210196772U (en) * | 2019-07-17 | 2020-03-27 | 杭州林润建设有限公司 | Municipal administration pipeline punctiform prosthetic devices |
| CN210484993U (en) * | 2019-07-05 | 2020-05-08 | 河钢股份有限公司承德分公司 | Sealing plate, sealing cylinder and pipeline |
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2020
- 2020-11-16 CN CN202011281635.5A patent/CN114508644B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200378236Y1 (en) * | 2004-12-13 | 2005-03-11 | 윤지련 | A Repair Apparatus for Gutter Lining |
| CN210484993U (en) * | 2019-07-05 | 2020-05-08 | 河钢股份有限公司承德分公司 | Sealing plate, sealing cylinder and pipeline |
| CN210196772U (en) * | 2019-07-17 | 2020-03-27 | 杭州林润建设有限公司 | Municipal administration pipeline punctiform prosthetic devices |
Non-Patent Citations (1)
| Title |
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| 李国胜: "不动火修复补强技术在石油输送管道中的应用", 《中国石油和化工标准与质量》, no. 2020, pages 240 - 241 * |
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