CN111981247A - Anti-corrosion repairing method for riverway bridge-following gas pipe - Google Patents
Anti-corrosion repairing method for riverway bridge-following gas pipe Download PDFInfo
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- CN111981247A CN111981247A CN202010782417.3A CN202010782417A CN111981247A CN 111981247 A CN111981247 A CN 111981247A CN 202010782417 A CN202010782417 A CN 202010782417A CN 111981247 A CN111981247 A CN 111981247A
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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
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/023—Cleaning the external surface
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/328—Phosphates of heavy metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention relates to an anti-corrosion repairing method for a fuel gas pipe along with a bridge in a river channel, which comprises the following steps: a. cleaning the surface of a gas pipeline: b. and (3) treating the surface defects of the pipeline: c. inspecting the surface of the pipeline before painting: d. coating an anti-rust coating: e. coating a self-repairing intermediate coating: f. the self-repairing coating has the advantages that the self-repairing middle coating layer and the self-repairing surface layer are coated with the self-repairing surface layer, the self-repairing middle coating layer contains a macromolecular flexible chain of an epoxy zinc phosphate paint system, the self-repairing surface layer contains a macromolecular flexible chain of an aliphatic polyurethane paint system, the self-repairing surface layer has a shape memory function, the self-repairing surface layer has a self-repairing function after slight cracking of the coating, the self-repairing coating layer has good flexibility, is more attached to the surface of a gas pipeline; due to the particularity of the gas medium in the pipeline, the coating is antistatic, and the safety of the river channel gas pipe is guaranteed; the self-repairing coating can keep the stability of the anticorrosive coating in the environments of humidity, high temperature, ultraviolet light and the like, is favorable for prolonging the service life of the anticorrosive coating of the gas pipe along with the bridge, and reduces the operation and maintenance cost.
Description
Technical Field
The invention relates to the technical field of corrosion prevention, in particular to a corrosion prevention repairing method for a gas pipe of a riverway along with a bridge.
Background
Because the gas pipe along with the bridge is in the environments of humidity, high temperature, ultraviolet light and the like for a long time, the anticorrosive coating cannot be attached to the pipe wall, the surface is brittle and cracked, and the corrosion risk is easy to generate; meanwhile, the anti-corrosion layer is unstable in structure and does not have an antistatic function in the environment for a long time, so that the safety risk is increased in the use process, and therefore anti-corrosion repairing operation needs to be performed on the gas pipe along with the bridge at regular intervals.
The existing bridge-following gas pipe repairing process only polishes the surface machinery, the impurity treatment of the rust-removing surface is incomplete and incomplete, the outer coating material mostly adopts epoxy paint, alcohol acid antirust paint and the like, the surface is not firmly bonded, the local part can not be attached, pores are easy to generate, the coating is easy to have the brittle spalling phenomenon after long-term use, the corrosion risk is generated, the special environment around the gas bridge pipe can not be adapted, the structural stability of the coating is poor, the corrosion resistance service life is short, and the maintenance cost is high.
In addition, because the gas pipe is used as a special pipeline, the static electricity prevention is particularly important, the existing repair process does not have a good antistatic function, and once corrosion leakage and static electricity occur simultaneously, the safety risk is large.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects in the prior art, the invention provides an anti-corrosion repairing method of a riverway bridge-following gas pipe with self-repairing performance, so that the adhesion of an anti-corrosion coating and the surface of a pipeline, the structural stability and the antistatic function of the anti-corrosion coating are improved, and the safety risk is reduced.
The technical scheme adopted by the invention for solving the technical problems is as follows: an anti-corrosion repairing method for a fuel gas pipe along with a bridge in a river channel comprises the following steps:
a. cleaning the surface of a gas pipeline: removing the damaged anticorrosive coating and impurities on the surface of the gas pipeline;
b. and (3) treating the surface defects of the pipeline: treating the rust, slag splash and sharp defects left on the surface of the pipeline;
c. inspecting the surface of the pipeline before painting: the surface of the pipeline is ensured to be dry and clean, the surface rust removal grade meets the construction requirement, the appearance is smooth, and impurities, edges and corners and burrs are avoided;
d. coating an anti-rust coating: the anti-rust coating is uniformly brushed, the sagging phenomenon is avoided, and the next self-repairing coating is brushed after 24 hours in a dry environment after brushing;
e. coating a self-repairing intermediate coating:
firstly, preparing a self-repairing intermediate coating: the component A comprises 35 to 50 percent of epoxy zinc phosphate paint system, 20 to 40 percent of toughening monomer, 3 to 10 percent of nonylphenol catalyst, 0.2 to 0.8 percent of antirust corrosion inhibitor, 0.1 to 0.7 percent of antistatic agent and 0.2 to 0.8 percent of anti-ultraviolet agent; the component B is a curing agent;
then, respectively stirring the A, B components uniformly, mixing the A, B components according to the proportion of 5.5: 1-3: 1, and stirring uniformly for later use;
the prepared self-repairing intermediate coating paint is coated on the surface of the anti-rust coating to form a self-repairing first intermediate coating, and after the surface of the self-repairing first intermediate coating is dried, a self-repairing second intermediate coating is coated on the surface of the self-repairing first intermediate coating to form a self-repairing second intermediate coating, so that the coating is uniform, flat and smooth and free of missing coating;
f. coating a self-repairing surface layer:
firstly, preparing a self-repairing surface layer coating: the component C comprises 30-50% of aliphatic polyurethane paint system, 25-45% of toughening monomer, 4-12% of nonylphenol catalyst, 0.1-0.7% of antirust corrosion inhibitor, 0.2-0.8% of antistatic agent, 0.2-0.8% of anti-ultraviolet agent and the component D is curing agent;
then, respectively stirring the C, D two components uniformly, mixing the C, D component according to the proportion of 5.5: 1-3: 1, and stirring uniformly for later use;
after the second self-repairing intermediate coating is dried, the self-repairing surface coating is coated on the surface of the second self-repairing intermediate coating to form a self-repairing surface coating, and the coating is free of bubbles and sagging.
In particular, in the step d, the dry film thickness of the anti-rust coating is 10 μm; in the step e, the film thicknesses of the self-repairing first intermediate coating and the self-repairing second intermediate coating are both 50 micrometers; in step f, the coating thickness of the self-repairing surface layer is 60 μm.
Preferably, the toughening monomer is preferably TMPO or polytetramethylene ether glycol.
The invention has the beneficial effects that: according to the invention, two self-repairing intermediate layers and one self-repairing surface layer are coated on the surface of the gas pipe along with the bridge in the riverway which is corroded and damaged, and the self-repairing function is realized after the coating is slightly cracked by using the flexible monomer with the shape memory function contained in the coating; the coating can keep the stability of the anticorrosive coating in the environments of humidity, high temperature, ultraviolet light and the like, is beneficial to prolonging the service life of the anticorrosive coating of the gas pipe along with the bridge, and reduces the operation and maintenance cost.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a process diagram of the repair method of the present invention.
FIG. 2 is a schematic structural view of the anti-corrosion coating of the gas pipe along with the bridge in the invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 1 and 2, an anticorrosion repairing method for a gas pipe along with a bridge in a river comprises the following steps:
a. cleaning the surface of a gas pipeline: removing the damaged anticorrosive coating and impurities on the surface of the gas pipeline;
specifically, the damaged anticorrosive coating on the surface of the gas pipe along with the bridge is removed, impurities such as floating dust, mud and ash on the surface of the gas pipe are removed by spraying through an air gun of an air compressor, the impurities such as grease, floating oil and ash and soil on the surface of the gas pipe are cleaned through a solvent, an alkali cleaning agent and the like, the loose impurities on the surface of the gas pipe are cleaned through a steel brush, a fiber cloth and the like, and finally the surface of the gas pipe is wiped clean.
b. And (3) treating the surface defects of the pipeline: treating the rust, slag splash and sharp defects left on the surface of the pipeline;
the method is characterized in that welding slag left on the surface of the gas pipeline is removed, sharp edges are required to be rounded, the surface of the gas pipeline is subjected to angle grinder tool or sand blasting derusting mode, the manual derusting quality is not lower than St3, the sand blasting derusting quality is not lower than Sa2, oil-free, dry, clean and loose rusty scale is achieved, the surface of the gas pipeline is required to be processed to be free of edges and corners, burrs and welding beading, fine metal luster is achieved, and finally the surface of the gas pipeline is wiped clean.
c. Inspecting the surface of the pipeline before painting: the surface of the gas pipeline is ensured to be dry and clean, the derusting grade meets the construction requirement, the appearance is smooth, and impurities, edges and corners and burrs are avoided.
d. Coating an anti-rust coating: the anti-rust coating is uniformly brushed, the sagging phenomenon is avoided, and the next self-repairing coating is brushed after 24 hours in a dry environment after brushing;
the rust-resistant coating has permeability to rust, can penetrate through the rust layer, fully reacts, passivates the surface layer, forms a polymeric protective layer and prevents the pipeline from being further oxidized; meanwhile, a closed area can be formed after the reaction with the residual rust, and the surface of the pipeline and the external corrosive environment are closed. The anti-rust coating should be brushed uniformly without sagging, and after 30 minutes, the coating is subjected to permeation reaction. After 24 hours in a dry environment, the next self-repairing coating is brushed, and the dry film thickness of the anti-rust coating is 10 mu m.
e. Coating a self-repairing intermediate coating:
firstly, preparing a self-repairing intermediate coating: the coating is formed by mixing a component A and a component B.
Wherein, the component A is 35 to 50 percent of epoxy zinc phosphate paint system, 20 to 40 percent of toughening monomer, 3 to 10 percent of nonylphenol catalyst, 0.2 to 0.8 percent of antirust corrosion inhibitor, 0.1 to 0.7 percent of antistatic agent and 0.2 to 0.8 percent of uvioresistant agent; the component B is a curing agent;
then, respectively stirring the A, B components uniformly, mixing the A, B components in a ratio of 5.5: 1-3: 1, and uniformly stirring to form the self-repairing intermediate coating for later use;
under the dry weather condition with the air temperature of 5-30 ℃, the self-repairing intermediate coating prepared by the method is used for brushing the surface of the anti-rust coating to form a self-repairing first intermediate coating, the brushing is uniform, no bubbles, sagging and missing coating phenomena occur, the appearance of a paint film is flat and smooth, the thickness of the paint film formed after brushing is 50 mu m, and the thickness of the dry film is ensured to meet the construction requirements.
After six hours, after the surface of the first self-repairing intermediate coating is dried, the self-repairing intermediate coating prepared according to the components is coated on the surface of the first self-repairing intermediate coating to form a second self-repairing intermediate coating, so that the uniform, flat and smooth coating is ensured, the coating leakage phenomenon is avoided, the thickness of a paint film formed after coating is 50 micrometers, and the thickness of a dry film is ensured to meet the construction requirement.
When the surface layer of a coating film of the self-repairing intermediate coating is scratched, the macromolecular flexible chain of the self-repairing epoxy zinc phosphate paint system has a shape memory function, the anticorrosion capacity of the macromolecular flexible chain is automatically repaired, the glass-transition temperature is 100 ℃, and the self-repairing time is about 72 hours.
The main technical indexes of the first intermediate coating and the second self-repairing intermediate coating are as follows: (1) the salt spray resistance can reach more than 500 h; (2) the rigidity of the material is improved, the corrosion of the pipe is prevented, the corrosion-resistant life is prolonged, and the environment is protected; (3) the glass transition temperature is 100 ℃, and the self-repairing time is about 72 hours.
f. Coating a self-repairing surface layer:
firstly, preparing a self-repairing surface coating which is formed by mixing a component C and a component D.
Wherein, the component C is 30 to 50 percent of aliphatic polyurethane paint system, 25 to 45 percent of toughening monomer, 4 to 12 percent of nonyl phenol catalyst, 0.1 to 0.7 percent of antirust corrosion inhibitor, 0.2 to 0.8 percent of antistatic agent, 0.2 to 0.8 percent of anti-ultraviolet agent, and the component D is curing agent;
then, respectively stirring the C, D components uniformly, mixing the C, D components in a ratio of 5.5: 1-3: 1, and uniformly stirring to form the self-repairing surface layer coating for later use;
after 24 hours, after the second self-repairing intermediate coating is dried, the surface of the second self-repairing intermediate coating is coated with the self-repairing surface coating to form a self-repairing surface coating under the dry weather condition of the air temperature of 5-30 degrees, the coating is uniform, no bubbles, no sagging and no coating leakage are caused, the thickness of the paint film formed after coating is 60 micrometers, and the thickness of the dry film is ensured to meet the construction requirement.
When the surface layer of a coating film of the self-repairing surface layer is scratched, the macromolecular flexible chain of the aliphatic polyurethane paint system has a shape memory function, can automatically repair the anticorrosion capability of the aliphatic polyurethane paint system, has the glass-transition temperature of 100 ℃, and has the self-repairing time of about 72 hours.
The main technical indexes of the self-repairing surface layer are as follows: (1) the salt spray resistance can reach more than 500 h; (2) the rigidity of the material is improved, the corrosion of the pipe is prevented, the corrosion-resistant life is prolonged, and the environment is protected; (3) the glass transition temperature is 100 ℃, and the self-repairing time is about 72 hours.
In the process of repairing and painting the bridge-following gas pipe, the safety of constructors, construction specification and field maintenance are ensured, meanwhile, plastic cloth is prepared, once the bridge-following gas pipe is exposed to rain, the unfinished gas pipe is covered by the plastic cloth, and painting operation is carried out according to the method when the environment meets the painting requirement.
In the self-repairing intermediate coating and the self-repairing surface coating, the adopted toughening monomer is preferably TMPO or polytetramethylene ether glycol.
The anticorrosion repairing method has the advantages that:
(1) and before the riverway along with the bridge gas pipe is repaired, the rust part is subjected to rust-resistant pretreatment, so that complete rust removal is ensured.
(2) The self-repairing coating is flexible, is more attached to the surface of the pipeline, is not easy to generate air holes, and is stable and uniform. The coatings at the edge positions of the flange and the compensator of the pipeline are attached and stable and are not easy to crack; the strength and stability are kept, and the flexible anti-corrosion material is flexible and does not crack.
(3) The self-repairing intermediate coating and the self-repairing surface layer adopt a self-repairing paint coating process, the coating contains flexible monomers with a shape memory function, and the coating has self-repairing performance after slight cracking.
(4) The paint is antistatic, has special gas pipelines, does not consider the factors in general paint, and ensures the safety of the river channel gas pipe; meanwhile, the coating can keep the stability of the anticorrosive coating in the environments of humidity, high temperature, ultraviolet light and the like, the stability is enhanced, and the anticorrosive service life is prolonged.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (3)
1. An anti-corrosion repairing method for a fuel gas pipe along with a bridge in a river channel is characterized by comprising the following steps: comprises the following steps:
a. cleaning the surface of a gas pipeline: removing the damaged anticorrosive coating and impurities on the surface of the gas pipeline;
b. and (3) treating the surface defects of the pipeline: treating the rust, slag splash and sharp defects left on the surface of the pipeline;
c. inspecting the surface of the pipeline before painting: the surface of the pipeline is ensured to be dry and clean, the surface rust removal grade meets the construction requirement, the appearance is smooth, and impurities, edges and corners and burrs are avoided;
d. coating an anti-rust coating: the anti-rust coating is uniformly brushed, the sagging phenomenon is avoided, and the next self-repairing coating is brushed after 24 hours in a dry environment after brushing;
e. coating a self-repairing intermediate coating:
firstly, preparing a self-repairing intermediate coating: the component A comprises 35 to 50 percent of epoxy zinc phosphate paint system, 20 to 40 percent of toughening monomer, 3 to 10 percent of nonylphenol catalyst, 0.2 to 0.8 percent of antirust corrosion inhibitor, 0.1 to 0.7 percent of antistatic agent and 0.2 to 0.8 percent of anti-ultraviolet agent; the component B is a curing agent;
then, respectively stirring the A, B components uniformly, mixing the A, B components according to the proportion of 5.5: 1-3: 1, and stirring uniformly for later use;
the prepared self-repairing intermediate coating paint is coated on the surface of the anti-rust coating to form a self-repairing first intermediate coating, and after the surface of the self-repairing first intermediate coating is dried, a self-repairing second intermediate coating is coated on the surface of the self-repairing first intermediate coating to form a self-repairing second intermediate coating, so that the coating is uniform, flat and smooth and free of missing coating;
f. coating a self-repairing surface layer:
firstly, preparing a self-repairing surface layer coating: the component C comprises 30-50% of aliphatic polyurethane paint system, 25-45% of toughening monomer, 4-12% of nonylphenol catalyst, 0.1-0.7% of antirust corrosion inhibitor, 0.2-0.8% of antistatic agent, 0.2-0.8% of anti-ultraviolet agent and the component D is curing agent;
then, respectively stirring the C, D two components uniformly, mixing the C, D component according to the proportion of 5.5: 1-3: 1, and stirring uniformly for later use;
after the second self-repairing intermediate coating is dried, the self-repairing surface coating is coated on the surface of the second self-repairing intermediate coating to form a self-repairing surface coating, and the coating is free of bubbles and sagging.
2. An anticorrosion repairing method for a riverway bridge-following gas pipe as claimed in claim 1, which is characterized in that: in the step d, the dry film thickness of the anti-rust coating is 10 mu m; in the step e, the film thicknesses of the self-repairing first intermediate coating and the self-repairing second intermediate coating are both 50 micrometers; in step f, the coating thickness of the self-repairing surface layer is 60 μm.
3. An anticorrosion repairing method for a riverway bridge-following gas pipe as claimed in claim 1, which is characterized in that: the toughening monomer is preferably TMPO or polytetramethylene ether glycol.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010782417.3A CN111981247A (en) | 2020-08-06 | 2020-08-06 | Anti-corrosion repairing method for riverway bridge-following gas pipe |
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| CN202010782417.3A CN111981247A (en) | 2020-08-06 | 2020-08-06 | Anti-corrosion repairing method for riverway bridge-following gas pipe |
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