CN114508644B - Pipeline repairing process and repaired pipeline - Google Patents
Pipeline repairing process and repaired pipeline Download PDFInfo
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- CN114508644B CN114508644B CN202011281635.5A CN202011281635A CN114508644B CN 114508644 B CN114508644 B CN 114508644B CN 202011281635 A CN202011281635 A CN 202011281635A CN 114508644 B CN114508644 B CN 114508644B
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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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- General Engineering & Computer Science (AREA)
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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: treating the to-be-repaired area of the pipeline to expose the pipeline base material at the to-be-repaired area; cladding the outer surface of pipeline substrate with netted base, netted base includes: a mesh body, a reinforcing seat at each mesh of the mesh body; the reinforcing block is arranged on the reinforcing seat in a non-welding mode, and the reinforcing block is matched with the reinforcing seat to form a reinforcing mechanism; and (3) brushing structural adhesive, so that the structural adhesive is filled among the pipeline base material, the net-shaped base and the reinforcing block, and after the structural adhesive is solidified, forming a repairing sleeve to complete the repairing of the area to be repaired 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
Because of the special laying property of the pipeline, the factors such as soil corrosion, landslide, external force damage and the like can cause pipeline defects to a certain extent, and especially the pipeline at the bending position of various large-caliber pipes is more prone to pipe wall defects caused by inconvenient construction and concentrated stress. If the pipeline defect is not repaired in time, pipeline accidents can be caused.
The related technology provides a composite steel sleeve pipe body defect repairing technology, wherein a fiber composite material is manually wound outside a pipeline, after resin is solidified, the fiber composite material and the defective pipeline are tightly combined and cooperatively deformed, and meanwhile, the steel sleeve is welded on site for fastening and reinforcing, so that the stress of the defective pipeline is reasonably distributed, and the reinforcing purpose is achieved.
In carrying out the invention, the present inventors have found that there are at least the following problems in the prior art:
the defect repairing process for the composite steel sleeve pipe body provided by the related technology has the problems that the steel sleeve is difficult to construct and install, the fiber composite is easy to age, the repairing effect is not durable, 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 pipe repair process, including: treating the to-be-repaired area of the pipeline to expose the pipeline base material at the to-be-repaired area;
cladding a mesh base to an outer surface of the pipe substrate, wherein the mesh base comprises: a mesh body, a reinforcing seat at each mesh of the mesh body;
the reinforcing block is arranged on the reinforcing seat in a non-welding mode, and the reinforcing block and the reinforcing seat are matched to form a reinforcing mechanism;
and brushing structural adhesive, so that the structural adhesive is filled among the pipeline base material, the net-shaped base and the reinforcing block, and after the structural adhesive is solidified, forming a repairing sleeve to finish repairing the to-be-repaired area of the pipeline.
In some possible implementations, the mesh body is made of wire rope, helical wire bundles, diamond wire rope mesh, ring mesh, or wire grid.
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 to the mesh of the mesh body by welding or hot-melt connection.
In some possible implementations, the reinforcing seat is provided with a mounting cavity matched with the reinforcing block structure, and the reinforcing block is mounted in the mounting cavity in a non-welding mode.
In some possible implementations, the reinforcing block is mounted in the mounting cavity by means of a snap-fit, a bolted connection, a universal joint connection or a rivet connection.
In some possible implementations, the materials of the reinforcing seat and the reinforcing block are 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 implementations, the reinforcing seat and the reinforcing block are made of a composite material, and the tensile yield strength of the composite material is equal to or more than 100MPa, the tensile modulus is equal to or more than 2000MPa, the elongation at break is equal to or less than 2%, the flexural modulus is equal to or more than 3000MPa, and the flexural strength is equal to or more than 150MPa.
In some possible implementations, the pipeline rehabilitation process further includes: and winding carbon fiber cloth or glass fiber cloth pre-impregnated with epoxy resin outside the repair sleeve.
On the other hand, the embodiment of the invention also provides a repair pipeline, which is prepared by adopting any pipeline repair 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 net-shaped base is coated on the surface of the pipeline substrate at the to-be-repaired area, and the bending resistance of the repairing sleeve can be improved by utilizing the characteristics of high strength and bending resistance of the net-shaped 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 structural adhesive is filled in the gap between any two of the pipeline base material, the net-shaped base and the reinforcing block, so that the internal pressure resistance of the repairing sleeve can be further optimized. Because the reinforcing block can be arranged on the reinforcing seat in a non-welding mode, the construction operation of repairing the sleeve is easier and more convenient. Therefore, the pipeline repairing process provided by the embodiment of the invention has the advantages of simple construction operation and strong applicability, and the prepared repairing sleeve has excellent strength and bending resistance, 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 of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a pipeline repair process provided by an embodiment of the invention;
fig. 2 is a schematic structural diagram of an exemplary mesh base and reinforcing block according to an embodiment of the present invention.
Reference numerals denote:
a 101-a net-like body, wherein,
102-a mesh of the net,
103-a reinforcing seat, wherein the reinforcing seat is provided with a plurality of reinforcing grooves,
104-a mounting cavity, wherein the mounting cavity is provided with a plurality of mounting holes,
105-a slot in which the pin is located,
2-a reinforcing block, which is arranged on the bottom of the frame,
201-clamping table.
Detailed Description
In order to make the technical scheme and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
In one aspect, an embodiment of the present invention provides a pipe repair process, as shown in fig. 1, including the following steps:
and step 1, treating the to-be-repaired area of the pipeline to expose the pipeline base material at the to-be-repaired area.
Step 2, coating the mesh base on the outer surface of the pipeline base material, wherein the mesh base comprises: the reinforcing seat is positioned at each mesh of the net-shaped body.
And 3, installing 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, brushing structural adhesive, namely filling the structural adhesive between the pipeline base material, the net-shaped base and the reinforcing block, and forming a repairing sleeve after the structural adhesive is solidified to finish repairing the to-be-repaired area of the pipeline.
The "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 net-shaped base is coated on the surface of the pipeline substrate at the to-be-repaired area, and the bending resistance of the repairing sleeve can be improved by utilizing the characteristics of high strength and bending resistance of the net-shaped 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 structural adhesive is filled in the gap between any two of the pipeline base material, the net-shaped base and the reinforcing block, so that the internal pressure resistance of the repairing sleeve can be further optimized. Because the reinforcing block can be arranged on the reinforcing seat in a non-welding mode, the construction operation of repairing the sleeve is easier and more convenient. Therefore, the pipeline repairing process provided by the embodiment of the invention has the advantages of simple construction operation and strong applicability, and the prepared repairing sleeve has excellent strength and bending resistance, 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 describes the steps according to the embodiments of the present invention:
and (2) for the step (1), treating the to-be-repaired area of the pipeline to expose the pipeline base material at the to-be-repaired area, so that the repair sleeve prepared later can be tightly adhered to the pipeline base material at the to-be-repaired area of the pipeline, and the repair effect is improved.
Illustratively, the processing the to-be-repaired area of the pipeline includes: and removing the PE anticorrosive coating and the epoxy resin on the surface of the to-be-repaired area of the pipeline by using medium-frequency heating equipment, and removing the residual epoxy resin and part of rust on the pipeline wall by adopting a sand blasting rust removing mode to expose the silvery white surface of the pipeline substrate.
After rust removal is finished, the surface of the pipeline base material is purged 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 of the area to be repaired of the pipeline can be finished.
The surface of the pipeline base material finally meets the treatment requirement of repairing the surface, and the construction of the repairing sleeve is required to be completed within 4-8 hours so as to prevent rust.
For step 2, coating the mesh base on the outer surface of the pipe substrate, wherein the mesh base comprises: the reinforcing seat is positioned at each mesh of the net-shaped body.
Illustratively, the coating the mesh base on the outer surface of the pipe substrate includes: the net-shaped base is placed on the outer surface of the pipeline base material by using a hoisting facility, so that the net-shaped base is wrapped around the outside of the pipeline base material, namely, the net-shaped base is wound on the outside of the pipeline base material, then the net-shaped base is tensioned by using a machine tool to remove redundant parts, meanwhile, the lap joint width of the lap joint parts at two ends is kept between 80mm and 120mm, for example, 100mm, and then the lap joint part of the net-shaped 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 kept 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.
Among them, the redundant portion removing means for the mesh base include, but are not limited to: shear cutting, flame burning, roll cutting, progressive cutting by a circular knife, auxiliary cutting by a pipe cutting machine, and the like.
In an embodiment of the present invention, a mesh base includes: the reinforcing seat is positioned at each mesh of the net-shaped body.
The mesh body and the reinforcing seat can be integrally prepared, or can be manufactured separately, and the reinforcing seat is arranged at each mesh of the mesh body, so that the mesh base can be obtained.
In some possible implementations, the mesh body may be made of steel wires, helical bundles of steel wires, diamond wire rope mesh, ring mesh, or wire grid.
The spiral wire bundle may be understood as a wire rope, and the mesh body may be obtained by performing a mesh operation using a wire or spiral wire bundle.
The mesh body is prepared by utilizing the articles, has the advantages of high flexibility, high strength, easy preparation and the like, and is convenient for obtaining mesh 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 the highest.
In some possible implementations, the mesh 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 mesh body is prepared by utilizing the polymer organic materials, and the mesh body 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 reinforcing seat includes, but is not limited to, the following: welding, hinge connection, bolt connection, sawtooth engagement connection, brush surface sticking connection, hot melting connection, wave 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 mesh base has high strength and structural stability, in order to simplify the preparation process of the mesh base, in the embodiment of the invention, the reinforcing seat and the mesh body are both made of high-strength materials suitable for welding, and the reinforcing seat is connected with meshes of the mesh body in a welding mode. Or, the reinforcing seat and the net-shaped body are made of high-strength materials suitable for hot melt connection, and the reinforcing seat is connected with meshes of the net-shaped body in a hot melt connection mode.
In the embodiment of the invention, the reinforcing block is arranged in the reinforcing seat in a non-welding mode, and in some possible implementation modes, the reinforcing seat is provided with a mounting cavity matched with the structure of the reinforcing block, and the reinforcing block is arranged in the mounting cavity in a non-welding mode.
The structure of the mounting cavity is matched with the structure of the reinforcing block, so that after the reinforcing block is mounted inside the mounting cavity, the surfaces of the mounting cavity and the reinforcing block can be kept flat, and the size of the repair sleeve is reduced.
For example, the mounting cavity is a rectangular cavity, and correspondingly, the reinforcing block is a rectangular block structure; the mounting cavity is a circular or oval cavity, and correspondingly, the reinforcing block is a circular or oval block.
For the manner in which the reinforcing blocks are attached within the mounting cavity, including but not limited to the following: the reinforcing block is installed in the installation cavity through clamping connection, 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. When the reinforced block is applied to the site, the reinforced block is installed from the 12 o 'clock direction of the pipeline base material in a manual operation mode, and meanwhile, the reinforced block is installed from two sides of the pipeline base material until the reinforced block is converged in the 6 o' clock direction of the pipeline base material.
Fig. 2 illustrates an exploded view of the reinforcement mechanism, i.e., a schematic view of the structure of the mesh body 101, the reinforcement seat 103, and the reinforcement block 2 in a disassembled state. Referring to fig. 2, the structure of the reinforcing seat 103 is adapted to the structure of the mesh 102 of the mesh body 101, and the reinforcing seat 103 may be fixed in the mesh 102 by welding or by bolting (in this case, an installation table is disposed on the outer side of the reinforcing seat 103, and female screw holes are correspondingly disposed on the installation table and the side wall of the mesh 102 to connect with the fixing bolts so as to fix the reinforcing seat 103).
The reinforcing block 2 is matched with the structure of the mounting cavity 104 of the reinforcing seat 103, and the reinforcing block and the mounting cavity are connected in a clamping manner. Illustratively, a plurality of card bodies 201 are provided on the outer side of the reinforcing block 2 in the vertical direction, and the plurality of card bodies 201 may be identical in structure 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 the reinforcing block 2 is installed, the reinforcing block 2 is positioned in the installation cavity 104, and meanwhile, the clamping body 201 on the reinforcing block 2 enters the clamping groove 105, so that the connection between the reinforcing block 2 and the reinforcing seat 103 is realized.
The materials of the reinforcing seat and the reinforcing block provided by the embodiment of the invention are selected from high-strength steel or high-strength organic materials so as to ensure that a 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 or ultra-low carbon steel with yield strength greater than 580MPa and tensile strength greater than 600 MPa. Wherein, ultra-low carbon steel refers to carbon steel with carbon content less than 0.03.
In other possible implementations, the reinforcing seat and the reinforcing block are made of a composite material, and the tensile yield strength of the composite material is equal to or more than 100MPa, the tensile modulus is equal to or more than 2000MPa, the elongation at break is equal to or less than 2%, the flexural modulus is equal to or more than 3000MPa, and the flexural strength is equal to or more than 150MPa.
As the above-mentioned composite material, exemplified are polyvinyl chloride, glass fiber-reinforced composite plastic, carbon fiber-reinforced composite plastic, boron fiber-reinforced composite plastic, ABS resin, polyoxymethylene thermoplastic crystalline polymer, PA46 (polybutylene adipamide), LCP engineering plastic, and the like.
In some possible implementations, any two adjacent reinforcing blocks may also be connected to further improve the structural stability of the mesh base.
For the connection between two adjacent reinforcing blocks, including but not limited to: an adhesive method, a shaft pin connection method, a welding method, a bolt connection method and the like.
And (4) brushing structural adhesive, filling the structural adhesive between the pipeline base material, the net-shaped base and the reinforcing block, and forming a repairing sleeve after the structural adhesive is solidified to finish repairing the to-be-repaired area of the pipeline.
The structural adhesive is cured after being painted, wherein the curing time is more than or equal to 40 minutes, so as to obtain a better curing effect.
In the implementation of the invention, the epoxy resin bi-component material with the shearing strength more than or equal to 20MPa, the compressive strength more than or equal to 50MPa and the adhesive force to steel more than or equal to 25MPa is preferably used after the epoxy resin bi-component material is dried.
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 Shore D or more, the freezing and thawing cycle is within the temperature range of-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 winding carbon fiber cloth or glass fiber cloth pre-impregnated with epoxy resin outside the repair sleeve.
The repair effect of the pipeline can be further improved by using the carbon fiber cloth or the glass fiber cloth pre-impregnated with the epoxy resin.
For the pre-impregnated epoxy resin, an epoxy resin bi-component material with shearing strength more than or equal to 18MPa, compressive strength more than or equal to 45MPa and adhesive force to steel more than or equal to 20MPa can be adopted.
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 Shore D or more, the freeze thawing cycle is within the temperature range of-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 utilized to carry 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 spliced type reinforcing mechanism, avoids the installation and construction of the reinforcing blocks in a welding mode, and has the advantages of simplicity and convenience in construction operation, rapidness in construction, few process steps, simplicity, safety and strong applicability of the installation process, 100% recovery of the bending resistance of the repairing layer, exceeding of the yield strength of the pipeline in the repairing pipeline and the like. The method has important significance for repairing the pipe body defects of the pipeline, in particular to the high-steel-grade large-caliber pipeline.
On the other hand, the embodiment of the invention also provides a repair pipeline, which is prepared by adopting any pipeline repair process.
The repair pipeline provided by the embodiment of the invention comprises the following components: repair pipe sections, and normal pipe sections other than repair pipe sections.
For repairing a pipe segment, comprising: the pipeline repairing sleeve comprises a pipeline base material and a repairing sleeve coated outside the pipeline base material, wherein the repairing sleeve is prepared by adopting any one of the pipeline repairing processes related to the embodiment of the invention.
The following detailed description of the invention and the advantages of the invention will be presented by way of specific examples, which are intended to facilitate a better understanding of the nature and characteristics of the invention and are not intended to limit the scope of the invention.
Example 1
And (3) detecting 43% of unfused weld defects at a certain position of a certain natural gas pipeline of a certain pipeline company, wherein the outer diameter of the pipeline is 1016mm, and the X70 pipe is made of steel, and stopping transportation and emptying of the pipeline after approval and recording are carried out to replace natural gas.
Excavating a pipe ditch, removing the PE anticorrosive coating and epoxy resin on the surface by using medium-frequency heating equipment, removing residual epoxy resin and partial rust on the pipe wall by adopting sand blasting and rust removal, and enabling the surface roughness of the silvery white steel surface of the pipe substrate at the to-be-repaired area to reach the level Ra2.5.
After the rust removal is finished, the surface of the pipeline base material is purged through air, and then the 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 of the area to be repaired of the pipeline can be finished. The surface of the pipeline base material finally meets the treatment requirement of repairing the surface, and the construction of the repairing sleeve is required to be completed within 6 hours so as to prevent rust.
The outer surface of the pipeline base material is placed on the mesh base by using a hoisting facility, the mesh base is wrapped around the outer part of the pipeline base material, the mesh base is wound outside the pipeline base material, then the mesh base is tensioned by using a machine tool, redundant parts are removed by using steel rope pliers, meanwhile, the lap joint width of the lap joint parts at two ends is kept at 100mm, and then the lap joint part of the mesh base is fixed by adopting a spot welding mode.
After finishing the coating operation of the mesh base on the surface of the pipeline base material, the position of the mesh base is adjusted to ensure that the central axis of the mesh base is kept coincident with the central axis of the pipeline base material so as to ensure that the mesh base is not obliquely positioned on the surface of the pipeline base material.
And (3) adopting a manual operation mode, starting to mount and fasten the reinforcing blocks from the 12 o 'clock direction of the pipeline base material, and simultaneously mounting from two sides of the pipeline base material until converging in the 6 o' clock direction of the pipeline base material. In this way, the reinforcing block can be attached to the reinforcing seat, wherein the reinforcing block and the reinforcing seat cooperate to form the reinforcing mechanism.
Wherein, the reticular body is prepared by adopting a diamond-shaped steel wire rope net, and the reinforcing seat and the reinforcing block are selected from alloy steel with yield strength more than 580MPa and tensile strength more than 600 MPa. The reinforcing seat is fixed in each mesh of the netlike body in a welding mode, as shown in fig. 2, the reinforcing seat is provided with a rectangular mounting cavity, and the reinforcing block with a rectangular structure is fastened in the rectangular mounting cavity of the reinforcing seat in a clamping mode.
And (3) preparing a bi-component epoxy resin structural adhesive, and brushing the structural adhesive to the surface of the pipe in the operation time, so that the structural adhesive fills gaps among any two of the pipeline base material, the net-shaped base and the reinforcing blocks.
And winding carbon fiber cloth or glass fiber cloth pre-impregnated with epoxy resin outside the repair sleeve, then performing corrosion prevention on the sand blasting residual positions on two sides of the pipeline by using a polyethylene cold winding belt, and backfilling the operation ditch.
Wherein, the shearing strength of the structural adhesive after the structural adhesive is dried is 25MPa, the compressive strength is 60MPa, and the adhesive force to steel is 30MPa.
The pre-impregnated epoxy resin has a shear strength of 30MPa, a compressive strength of 65MPa and an adhesion to steel of 35MPa after being dried.
Example 2
And (3) detecting 49% of unfused weld defects at a certain position of a certain natural gas pipeline of a certain pipeline company, wherein the outer diameter of the pipeline is 1016mm, and the X70 pipe is made of steel, and stopping transportation and emptying of the pipeline after approval and recording are carried out, so that natural gas is replaced.
Excavating a pipe ditch, removing the PE anticorrosive coating and epoxy resin on the surface by using medium-frequency heating equipment, removing residual epoxy resin and partial rust on the pipe wall by adopting sand blasting and rust removal, and enabling the surface roughness of the silvery white steel surface of the pipe substrate at the to-be-repaired area to reach the level Ra2.5.
After the rust removal is finished, the surface of the pipeline base material is purged through air, and then the 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 of the area to be repaired of the pipeline can be finished. The surface of the pipeline base material finally meets the treatment requirement of repairing the surface, and the construction of the repairing sleeve is required to be completed within 6 hours so as to prevent rust.
The outer surface of the pipeline base material is placed on the mesh base by using a hoisting facility, the mesh base is wrapped around the outer part of the pipeline base material, the mesh base is wound outside the pipeline base material, then the mesh base is tensioned by using a machine tool, redundant parts are removed by using steel rope pliers, meanwhile, the lap joint width of the lap joint parts at two ends is kept at 100mm, and then the lap joint part of the mesh base is fixed by adopting a spot welding mode.
After finishing the coating operation of the mesh base on the surface of the pipeline base material, the position of the mesh base is adjusted to ensure that the central axis of the mesh base is kept coincident with the central axis of the pipeline base material so as to ensure that the mesh base is not obliquely positioned on the surface of the pipeline base material.
And (3) adopting a manual operation mode, starting to mount and fasten the reinforcing blocks from the 12 o 'clock direction of the pipeline base material, and simultaneously mounting from two sides of the pipeline base material until converging in the 6 o' clock direction of the pipeline base material. In this way, the reinforcing block can be attached to the reinforcing seat, wherein the reinforcing block and the reinforcing seat cooperate to form the reinforcing mechanism.
Wherein the net-shaped body is prepared from aramid fiber reinforced plastics, the reinforcing seat and the reinforcing block are selected from polyvinyl chloride with tensile yield strength more than or equal to 100MPa, tensile modulus more than or equal to 2000MPa, elongation at break less than or equal to 2%, flexural modulus more than or equal to 3000MPa and flexural strength more than or equal to 150MPa. The reinforcing seat is fixed in each mesh of the net body in a brush surface bonding mode. The reinforcing seat is provided with a circular mounting cavity, and the reinforcing block with a circular structure is buckled inside the circular mounting cavity of the reinforcing seat in a clamping manner.
And (3) preparing a bi-component epoxy resin structural adhesive, and brushing the structural adhesive to the surface of the pipe in the operation time, so that the structural adhesive fills gaps among any two of the pipeline base material, the net-shaped base and the reinforcing blocks.
And winding carbon fiber cloth or glass fiber cloth pre-impregnated with epoxy resin outside the repair sleeve, then performing corrosion prevention on the sand blasting residual positions on two sides of the pipeline by using a polyethylene cold winding belt, and backfilling the operation ditch.
Wherein, the shear strength of the structural adhesive after the structural adhesive is dried is 30MPa, the compressive strength is 65MPa, and the adhesive force to steel is 35MPa.
The pre-impregnated epoxy resin has a shear strength of 35MPa, a compressive strength of 65MPa and an adhesion to steel of 37MPa after being dried.
The foregoing description is only for the convenience of those skilled in the art to understand the technical solution of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. 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 pipe repair process, the pipe repair process comprising: treating the to-be-repaired area of the pipeline to expose the pipeline base material at the to-be-repaired area;
cladding a mesh base to an outer surface of the pipe substrate, wherein the mesh base comprises: a mesh body, a reinforcing seat at each mesh of the mesh body;
the reinforcing block is arranged on the reinforcing seat in a non-welding mode, and the reinforcing block and the reinforcing seat are matched to form a reinforcing mechanism;
and brushing structural adhesive, so that the structural adhesive is filled among the pipeline base material, the net-shaped base and the reinforcing block, and after the structural adhesive is solidified, forming a repairing sleeve to finish repairing the to-be-repaired area of the pipeline.
2. The pipe repair process of claim 1, wherein the mesh body is prepared from wire rope, helical wire bundles, diamond wire rope mesh, ring mesh, or wire grid.
3. The pipe repair process of claim 1, wherein the mesh body is prepared from 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 to the mesh of the mesh body by welding or hot melt connection.
5. The pipe repair process according to claim 1, wherein the reinforcing seat is provided with a mounting cavity matched with the reinforcing block structure;
the reinforcing block is arranged in the mounting 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 means of a snap fit, a bolt connection, a universal joint connection or a rivet connection.
7. The pipe repair process according to claim 1, wherein the material of the reinforcing seat and the reinforcing block is selected from alloy steel or ultra low carbon steel with yield strength of more than 580MPa and tensile strength of more than 600 MPa.
8. The pipe repair process according to claim 1, wherein the reinforcing seat and the reinforcing block are made of a composite material, and wherein the tensile yield strength of the composite material is equal to or more than 100MPa, the tensile modulus is equal to or more than 2000MPa, the elongation at break is equal to or less than 2%, the flexural modulus is equal to or more than 3000MPa, and the flexural strength is equal to or more than 150MPa.
9. The pipe repair process of any one of claims 1-8, further comprising: and winding carbon fiber cloth or glass fiber cloth pre-impregnated with epoxy resin outside the repair sleeve.
10. A repair pipe prepared by the pipe repair process according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011281635.5A CN114508644B (en) | 2020-11-16 | 2020-11-16 | Pipeline repairing process and repaired pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011281635.5A CN114508644B (en) | 2020-11-16 | 2020-11-16 | Pipeline repairing process and repaired pipeline |
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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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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 |
|---|
| 不动火修复补强技术在石油输送管道中的应用;李国胜;《中国石油和化工标准与质量》;第工程科技Ⅰ辑卷(第2020年第8期期);240-241页 * |
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